Been a HVAC engineer for over 30 years was in hospital brushing up watching your video's you never stop learning and also you forget a lot of basics over the years brilliant videos . Are you putting together a book ?
Are you being ironic? We face a future of climate chaos and ecosystem collapse, and you think you live in great times? Geothermal energy is energy taken from the Earth's core, it comes from heat generated during the original formation of the planet and the radioactive decay of materials, and is not green in any way. Just because it doesn't cause CO2 emmissions some shallow thinkers imagine it's part of the solution to global heating, it isn't, it's part of the problem, and while fossil fuels are being phased out geothermal is expanding because simple non thinkers imagine it's green. Just repeating low carbon is a mantra to reassure those scared of the consequences of climate change. Dream on.
Indeed we do. Kids nowadays have no idea how good they have it. But then, it's always been that way. You need to live a little, try to survive off grid for a while. Then you can come back appreciate glorious civilization!
we have the adequate knowledge that came from the mistakes of our ancestors, if we acknowledge every knowledge and failures that they have made I am sure we still have a chance to rewrite this world
I’m 36 and have been an HVACR tech for 17 years now. Heat pumps have come a long way. I don’t care who says what they are very practical and efficient. Check out the Mitsubishi Hi-2 versions. They give you 100% heat capacity at 5 degrees Fahrenheit and 95% heat capacity at -15 degrees Fahrenheit!!! That’s insane.
@@sheledmikymo Very low compared with heating with gas and especially low compared to electric resistance heat. Heat pumps don't create heat. They use electricity to move refrigerant, which carries or "pumps" heat from inside to outside or vice-versa. That takes a lot less energy than creating heat.
These are by far the best and most clear videos that I have found. I use them in my Adult HVAC classes and they benefit my students greatly. Thanks for clear, concise, accurate, and sometimes amusing videos!
yea but i think that the part at: 6:22 is misleading for people who just learn about this stuff from my personal logic/understanding the expansion valve just maintains the two different pressure zones and its not the thing that actually turns liquid into vapor I'm pretty sure that its the pressure drop doing that, and the pressure drop is caused by the compressor but this is just my logic and maybe im just nitpicking... anywa, the video is great
I worked in aerospace and the facility I worked at had many large buildings and lots of workers ....they did not use conventional HVAC they had a central plant that made steam and also water to all the buildings ....chilled water and air movement kept those building CHILL all summer long and the steam lines kept it all toasty in the cold months and provided hot water ...I was always amazed how well it all worked
The best explanation I found so far, thank you. Will watch all of videos to understand the principle. I want to start this type of business in Kazakhstan in future, so just researching
Yep, it is fascinating. I just cannot get my head around how on earth it is more efficient than the water tank with a simple heating rod inside. Pushing the coolant (R134a) in your car costs you approx 10% of the total fuel consumption and some considerable power if you have petrol engine 1.1 litre. Even the most typical fridge-freezer - the compressor is using about 500W - to cool 20 deg celsius in maybe 0.5m3 I am not convinced this system is able to produce 70 celsius on even one small radiator and deliver hot water (52Celsius) to the taps. Have the thermodynamic laws changed recently?
Best explaination of the air to air system I have ever seen. I have 40 years in the HVAC system and I'm so tired of the "advertising" of the heat pump takes "heat" out of the ambient air outside and transfers it to heat in the house. When it's 10F degrees outside there is no heat there but when I try to explain the heat comes from the compression of the refridgerant out of the compressor I'm told I'm always wrong and even by some of the current crop of HVAC mechanics. I definitely subscribed and liked and will refer doubting Thomas's to your video!
When is 10°f, there's 10°out there. The phase change takes place anywhere north of -15°f, so it's definitely taking heat from the outside. You can test this by putting thermometers in front of and behind your outdoor unit.
Respectfully Chris you're wrong. And what am I gonna do with 10 degrees in a house I'm trying to get to let's say 70? Take your time and figure out what is going on. You'll figure it out and don't just buy the hype of the heat pump. There is a reason modern thermostats let you select an OAT to not activate the heat pump and use Aux heat instead. Just figure out what you have and what you're trying to do. I promise you the light will go on and you'll respond I'm right. I've been in the business way too long my friend.
@@lisajohnson8566Ask yourself how AC works, how can you make 90 air into 45 degree air that cools your house to 65 degrees on a hot summer day? It’s an energy transfer, and each system fluid has different levels of efficiency. This is why a harmful chemical like Freon is used. It can swing over 200 degrees between phases and pressures, whereas water cannot get cold without freezing, so your band is smaller. Efficiency will kill an H2O A/C.
@@lisajohnson8566Additionally, Freon can go as cold as -25 to -55 degrees, which is colder than a cold day, so the needed heat transfer can still exist. The reason AC is much more efficient than heat pumps is the difference in temperatures. The hot Freon is much hotter than outside whereas the cold Freon is only a little colder than the outside cold. Think in terms of relativity and energy transfer more than temperature transfer, which if that was the case, a/c’s would not work and nor would heat pumps.
I've been looking for a simple explanation like this. The only way this could be better is if you showed an example of the physical devices for the indoor and outdoor units or parts. And thanks for the great video!
I used the exact solenoid with a high flow rate as the fluid pushes down on the oversized valve land for sealing at static pressure. But mine is on an oil accumulator to pre-lube a gas V-8 engine. It is energized with the key on so during starting, it quickly floods the main oil gallery (High-Flow, 1/2" NPT, Viton Rubber Seal; New surplus at 1/10th the cost of Name Brand oil accumulator companies; with pressurized oil to the bearings. This would greatly extend the life of all "Stop-Start" engines in those vehicles. After being an ASE Master Tech since 78, I will argue a room of engineers under the table! 5,000hrs is the 150,000 mile equivalent that GM designs parts, materials and still make them to keep from paying CAFE a fine. It's a law passed by the Clinton administration. Great job on the video.
To quote the unforgettable Terry Thomas.....'Oh I say!...what a perfectly splendid, top hole video!"Very clear diagrams, excellent narration, well explained. When I have to have one, I'll back-refer to this vid.!
I have a Carrier PURON heat pump system installed in 2007 and it is still working wonderful here in Pensacola FL with only a few breakdowns from minor parts from time to time!
if they were all so magically efficient As everyone says they are, they would already be in all new homes. But they're not because they're more complex, have more parts, function poorly in outside temp extremes and are literally a pipe dream at this point.
Mine is between 360-420% efficient, depending on how cold it is outside and how high of a flow temperature I need. I didn't pull these numbers out of a datasheet, they come from electric consumption and heat output monitoring... they're as real as they get. For every kWh of electricity it uses, my heat pump provides between 3,6 - 4,2kWh of heat. Granted, we don't live in Canada, Scandinavia or Siberia, we do get below 0ºC temps, but nothing as crazy as -20 or -40ºC This "pipe dream" has been keeping our home at a comfy 21-23ºC and providing domestic hot water all winter. The running cost is less than half of what we used to spend with our oil boiler, the level of comfort is miles better, thanks to increased flow rate and constant operation. Also, fyi, heat pumps, solar thermal, etc. are already mandatory for new buildings in some countries. The main problem I see with heat pumps is that many installers and sales people either have no clue or are dishonest. They charge twice or thrice as much as they should, they sell you criminally oversized machines, they insist on putting in a buffer tank and secondary pumps when there's no need in many cases (and it's counterproductive, even)...
In winter uk (Oct to Mar ie 6months of the year!): 1. Lounge gets too hot at seated height 2. Lounge is very cold at foot level 3. Cannot air dry clothes in home anymore - Have to use Dryer - more electric) 4. Costs 3x more than summer 5. Is a nightmare and frustrating to understand operation for a typical end user
That’s a great video, I really like that you stop to point us in the direction of other videos that explain the various stages in more detail. Really brilliant stuff, thanks.
I wish you did a video with graphics. Such as within the pipes. Show each process in detail as it passes each component. Essentially combining all your videos in one. No complaints here. Love your work. I’m just asking as I learn better with pictures and visualizations. One of the reasons I’m attracted to your channel. Thank you
I’ll be honest that is much more complicated than I thought it was gonna be. Great explanation!! It’s crazy to think the amount of knowledge you need to have just to be a red seal tradesman!! Kudos
This is by far the best video explaining and illustrating how heat pump works. Some other ones on here seem to assume you already have a master's degree in HVAC to understand them.
Thankyou for explaining in such a way that i understand. I have watched other videos but it just left me more confused, now watching this short video I get it, thanks again.
How much energy does that compressor use? This is all nice, but is the electricity required for that compressor what uses electricity the most in this system?
Everything is relative. Water boils at 212 degrees F at sea level pressure which is 14.7 psi. Have seen it boil in a vacuum at room temperature and it can boil at hundreds of degrees in a high pressure boiler. This is the basis of a refrigeration system. By manipulating temperatures and pressures you can force a refrigerant to either evaporate or condense which will either absorb or release heat. Basically using a refrigerant to transfer heat from one area and release it in another area.
I don't understand one thing. The most common refrigerators such as R32 and R410A, have a boiling temperature at around -50 degree Celcius. Let's assume that the indoor temperature is 30 C and outdoor temperature is 30 C too. And we want to cool the place. How is it possible that the temperature of the refrigerant increases in the evaporator and drops in the condenser? In the evaporator, the refrigerant exchanges heat with the indoor air(30 C) and it warms. In the condenser, the refrigerant exchanges heat with the outdoor air(30 C) and it cools and condensed. How can you drop the temperature of the refrigerant to -50 degree C using the 30-degree C air? That's against the thermodynamics rules.
@@kaan2215 Get a pressure temperature chart for R-22 and follow along. I am going to use Farenheight. R-22, at 14.7 pounds pressure (atmospheric), has a boiling temp of around -13 degrees. Let's go thru a complete refrigeration cycle in a comfort AC system with 90 degrees ambient, 75 degrees in the conditioned space, a high side pressure of 250 psig, and a low side pressure of 65 psig. The compressor will compress the refrigerant to a high pressure, high temperature gas, and in this example of a high side pressure of 250 psig, its condensing temperature is 117 degrees. Now the condenser fan runs cooler 90-degree air over the condenser coil and cools this refrigerant below the 117 condensing temperature forcing the refrigerant to condense. This change of state, from a gas to a liquid, releases a large amount of heat, called latent heat. This refrigerant then leaves the condenser at basically the same pressure but now is a medium temperature liquid. This refrigerant then enters the evaporator thru an expansion device, which induces a pressure drop. In this example we now have a 65 PSIG evaporator coil, and at that pressure R-22 evaporates at around 37.5 degrees and it is forced to evaporate, and this change of state absorbs a large amount of BTU's from the warmer 75-degree room air that is passing over the evaporator coil. We are now left will low pressure, low temperature gas that goes back to the compressor to start our cycle all over again. It completely follows and can be explained by the laws of thermodynamics. Please let me know if there is something you don't understand and I can help you with it.
@@kaan2215 Its actual simple. Get a pressure temperature chart and follow along. We are going to use Fahrenheit and R-22 in a comfort air conditioning scenario, with 90 degree outside air and a 75 degree inside air, with a 250 PSIG high side pressure and a 65 PSIG low side pressure. Starting at the compressor, it compresses a low temperature, low pressure gas to a high temperature, high pressure gas and discharges this gas thru the hot gas line to the condenser at 250 PSIG .The condensing temperature of refrigerant at that pressure for R-22 is 117 degrees, and as the cooler outside 90-degree air passes over the condenser coil it cools the refrigerant below its condensing temperature and forces it to condense. This change of state, from a gas to a liquid, releases a tremendous amount of heat, called latent heat. We are now left with a high pressure, medium temperature liquid that leaves the condenser thru the liquid line and then enters the evaporator thru an expansion device, which induces a pressure loss and, in this example, leaves us with a 65 PSIG evaporator coil. R-22 at this pressure evaporates at around 37.5 degrees and since room air passing over the coil is 75 degrees this forces the refrigerant to evaporate. Again, a change of state, this time from a liquid to a gas, now absorbs a large amount of heat (from the room air) and now we are left with a low temperature, low pressure gas that returns to the compressor to start the whole refrigeration cycle over again. Completely follows and is explained by the laws of thermodynamics.
@@kaan2215Mostly about manipulating refrigerant to the proper pressures but then you also have to then manipulate the refrigerant temperature to then change its state from a liquid to a gas ( or vice versa) to complete this process.
6:43 The hot water tank doesn't feed the radiators, if it did, it would run out of hot water in a matter of minutes. Keep in mind that heat pumps have high flow rate, they move over 600 liters of water per hour. A heat pump needs between 30 - 90 minutes to heat up a 200 liter water tank. If you moved all the water in the tank through the radiator circuit 3+ times per hour, the heat pump wouldn't be able to keep up with the dissipation rate. DHW tanks for heat pumps aren't heated directly, a "serpentine" (spiral heat exchanging pipe) is used to heat the water in the tank, so there's an efficiency penalty. Some tanks also come with auxiliary heating elements (resistors), which help speed up the heating process, but this comes at the cost of doubling electric consumption, which defeats the purpose of having a heat pump. So, basically, the heat pump needs to feed the radiator circuit directly, for best results. This is achieved by using a 3-way electrovalve, which is installed between the heat pump and everything else. This electrovalve diverts the ouflowing hot water from the heat pump to either the radiator circuit or the water tank's internal "serpentine", as needed. It's an "either or" kind of system, it won't do both DHW and radiator heating at the same time.
ssllhh100 Hi, for an water source heat pump you can use this the wasted energy either heating or cooling if you have a series of outdoor units coupled together.
Second law of thermodynamics, with every exchange, our energy storage, is becoming more and more diffuse and less and less usable. I'd imagine you could surround your heat pumps, with other heat pumps, until there was no usable energy left and it was requiring more energy to drive the pump, than was being extracted.
If a person invented some free energy machine, they would still need to advertise as they are educating the market that there is a solution. Not everyone knows what this is or what it does and I have no motivation to go out and tell people, but the company is motivated to teach the public the benefits and the channel is motivated to pass on the information by revenue. Is it so bad that you got free access to useful information? Is it bad that you now think of that brand and the video maker gets paid for making a video? They never said they are the only ones to make this product or that there's is the best, only explained the tech.
Are there any health concerns for installing both units indoors? What is the physical properties of a heat pump system that prevents indoor installation of both units? e.g. Installing the "outdoor" unit at one end of a 40' attic and the "indoor" unit at the other end?
Even idiots like me (a historian, with zero knowledge of physics or engineering) can be very much enlightened and informed by this video. I always wondered how my f---g hot air pump worked. Thought it was by black magic. And yet, depend on it so thoroughly (live in Sweden). THANK YOU.
Hello Paul, I just discovered you RUclips channel. I think it is absolutely amazing. I'm on a quest to engineer the most sustainable home. I'm wondering if this is a topic you might make some videos on.
I apologize if this is mentioned somewhere in the video and I just missed it but I feel like its important to explain that the boiling point of the refrigerant mentioned was at atmospheric pressure. As pressure changes boiling point does too. 410a in an evaporator coil is usually at a boiling point between 36°f and 50°f this is why we get air in the 40-60 range leaving the coil.
Here in Sweden the Nibe F1255 and Mitsubishi Ecodan are getting more and more populair with outside temp -30C they still are efficient!! We install them every day. Great vid by the way!👍🏻
Are the expansion valves in this example one-way only devices? They only allow flow in one direction hence the non-return valves and the fact that there are two of them in this example. Thanks.
How has it worked for you? Do you find it efficient? How cold does it get where you live ? I'm in Western Kanada, it's forced air furnaces everywhere up here. Very inefficient.
Great lesson! Could you please explain how HP dryers accomplish dehumidification parallel to cooling? In food processing, HPD are used for low temperature low humidity drying of thermally sensitive foods.
I have a question as I am see people stating heat pumps are efficient but when they utilize auxiliary heating system which works in conjunction with the heat pump when the outside temp is around 37 degrees. I used an amp clamp to see what the current use was with the heat pump V the auxiliary. in. the heat pump mode the current was 45 amps while when it was in the auxiliary mode the current was 34 amps. it appears it would be cheaper to heat me house with the auxiliary mode how can this be the case? Help please
You don't know what the actual heat output from the heat pump vs the aux heat is, you only know what the electrical input is. The electric element probably only outputs 1/3 of the heat that the heat pump will.
I lived in three places with heat pumps for a total of 8 years. Two of the pumps had to be replaced at significant cost. In 35 years with gas heat and airconditioning I never had to replace anything.
Great work your,videos are awesome, I need to make a project presentation at college can you please tell me how these type of animation explanations is made??
Why is the expansion valve and outdoor heat exchanger needed in heating mode? Can't the slightly cooled refrigerant from the inside exchanger just go right back to the compressor? Or does it need to return with low pressure?
So do these heat pumps, pollute the atmosphere, in much the same way as do refrigerators? And if so, how are they, any better than normal, household gas boilers?
The air to water system , what sort of temperatures as an estimate across most units would you get in the water storage heating coil with no electrical element assistance ? Do they have enough power to heat a house 3 to 4 bedroom rough size on the air to water heat pump alone ?
sir i have a question. what if i want to build my own mini electricity? through natural gas. since my place have own natural gas on underground. now i want to install heat exchanger on my genset. is it possible to do that? instead of using it's giant radiator. I'll just took it out then replace it with heat exchanger system? so could run it continuously everyday?
Just curious when using a reversing valve can the expansion valves just be the basic thermal type or do they need to be an electronic expansion valve thanks
hello , can anyone tell me how hot degrees celsius the fan delivery tube is in winter mode , if we have set 31 °C (full capacity for heating ) room temperature ?
Classic inverter heat pumps only have 1 expansion valve which works for Cooling and Heating. And on/off models have a small capillar pipe for Cooling the freon
I suddenly realized why they call the two lines that connect the outdoor unit to indoor hardware the 'vapor line' and the more narrow gauge 'liquid line'. Because of the reversing valve, the direction of flow on those two lines reverses flow when changing mode, but the larger vapor line always carries vapor, the more narrow gauge line carries mostly liquid. During heating the vapor line carries slightly superheated vapor to the indoor condensor, during cooling the room temperature vapor makes its way back to the compressor in the opposite direction. Presumably the indoor vapor line always comes off the top of the coils, the liquid line comes off the bottom, so gravity keeps fluid from going the wrong way and choking the compressor.
I appreciate the video, but one thing I'm trying to understand is how the indoor heat exchanger works. In cooling mode, warm air is pulled in, making the room cold. In heating mode, warm air is blown into the room. How does this work? Are there multiple fans?
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Good
Helpful.thanks.
Could you please make a video on vapour injection system in scroll compressors?
01:17 into the video, and the second commercial begins.
Remember when youtube wasn't obnoxiously innundated with excessive commercials ?!?
Pepperidge Farm Remembers !
Been a HVAC engineer for over 30 years was in hospital brushing up watching your video's you never stop learning and also you forget a lot of basics over the years brilliant videos . Are you putting together a book ?
Do you mkake good money doing this?
You bet, Abdul, you bet
Keep on learning
You asked a good question. It would be great if all these points were collected in the form of a book or continuous educational video
I Love the fact that a channel like this can even exist :) We live in great times
No we don´t. the earth has corona
Are you being ironic? We face a future of climate chaos and ecosystem collapse, and you think you live in great times? Geothermal energy is energy taken from the Earth's core, it comes from heat generated during the original formation of the planet and the radioactive decay of materials, and is not green in any way. Just because it doesn't cause CO2 emmissions some shallow thinkers imagine it's part of the solution to global heating, it isn't, it's part of the problem, and while fossil fuels are being phased out geothermal is expanding because simple non thinkers imagine it's green. Just repeating low carbon is a mantra to reassure those scared of the consequences of climate change. Dream on.
Indeed we do. Kids nowadays have no idea how good they have it.
But then, it's always been that way. You need to live a little, try to survive off grid for a while. Then you can come back appreciate glorious civilization!
@@davidjessop2279 lighten up nerd it's an opinion lol
we have the adequate knowledge that came from the mistakes of our ancestors, if we acknowledge every knowledge and failures that they have made I am sure we still have a chance to rewrite this world
I live in the tropics. Never heard of heat pumps. But imagined it to be a 'reverse' AC unit. Very helpful explanation. Thanks
I’m 36 and have been an HVACR tech for 17 years now. Heat pumps have come a long way. I don’t care who says what they are very practical and efficient. Check out the Mitsubishi Hi-2 versions. They give you 100% heat capacity at 5 degrees Fahrenheit and 95% heat capacity at -15 degrees Fahrenheit!!! That’s insane.
ApprenticeThatTextstooMuch and the electrical costs are?
@@sheledmikymo MUCH lower than using a typical space heater
Its the LED equivalent of heating
@@sheledmikymo Very low compared with heating with gas and especially low compared to electric resistance heat. Heat pumps don't create heat. They use electricity to move refrigerant, which carries or "pumps" heat from inside to outside or vice-versa. That takes a lot less energy than creating heat.
Is it possible to power an air to water heater with a solar panel
@@jodygallagher8829 Yes, with a large enough panel. It wouldn't take much.
These are by far the best and most clear videos that I have found. I use them in my Adult HVAC classes and they benefit my students greatly. Thanks for clear, concise, accurate, and sometimes amusing videos!
yea but i think that the part at:
6:22
is misleading for people who just learn about this stuff
from my personal logic/understanding the expansion valve just maintains the two different pressure zones and its not the thing that actually turns liquid into vapor
I'm pretty sure that its the pressure drop doing that, and the pressure drop is caused by the compressor
but this is just my logic and maybe im just nitpicking...
anywa, the video is great
👌
I worked in aerospace and the facility I worked at had many large buildings and lots of workers ....they did not use conventional HVAC they had a central plant that made steam and also water to all the buildings ....chilled water and air movement kept those building CHILL all summer long and the steam lines kept it all toasty in the cold months and provided hot water ...I was always amazed how well it all worked
The best explanation I found so far, thank you. Will watch all of videos to understand the principle. I want to start this type of business in Kazakhstan in future, so just researching
I’ve been fascinated by this process because it’s in a closed loop, I know a high pressure side and low pressure side, but flipping them is brilliant.
Yep, it is fascinating. I just cannot get my head around how on earth it is more efficient than the water tank with a simple heating rod inside. Pushing the coolant (R134a) in your car costs you approx 10% of the total fuel consumption and some considerable power if you have petrol engine 1.1 litre. Even the most typical fridge-freezer - the compressor is using about 500W - to cool 20 deg celsius in maybe 0.5m3 I am not convinced this system is able to produce 70 celsius on even one small radiator and deliver hot water (52Celsius) to the taps. Have the thermodynamic laws changed recently?
Best explaination of the air to air system I have ever seen. I have 40 years in the HVAC system and I'm so tired of the "advertising" of the heat pump takes "heat" out of the ambient air outside and transfers it to heat in the house. When it's 10F degrees outside there is no heat there but when I try to explain the heat comes from the compression of the refridgerant out of the compressor I'm told I'm always wrong and even by some of the current crop of HVAC mechanics. I definitely subscribed and liked and will refer doubting Thomas's to your video!
When is 10°f, there's 10°out there. The phase change takes place anywhere north of -15°f, so it's definitely taking heat from the outside. You can test this by putting thermometers in front of and behind your outdoor unit.
Respectfully Chris you're wrong. And what am I gonna do with 10 degrees in a house I'm trying to get to let's say 70? Take your time and figure out what is going on. You'll figure it out and don't just buy the hype of the heat pump. There is a reason modern thermostats let you select an OAT to not activate the heat pump and use Aux heat instead. Just figure out what you have and what you're trying to do. I promise you the light will go on and you'll respond I'm right. I've been in the business way too long my friend.
@@lisajohnson8566Ask yourself how AC works, how can you make 90 air into 45 degree air that cools your house to 65 degrees on a hot summer day? It’s an energy transfer, and each system fluid has different levels of efficiency. This is why a harmful chemical like Freon is used. It can swing over 200 degrees between phases and pressures, whereas water cannot get cold without freezing, so your band is smaller. Efficiency will kill an H2O A/C.
@@lisajohnson8566Additionally, Freon can go as cold as -25 to -55 degrees, which is colder than a cold day, so the needed heat transfer can still exist. The reason AC is much more efficient than heat pumps is the difference in temperatures. The hot Freon is much hotter than outside whereas the cold Freon is only a little colder than the outside cold. Think in terms of relativity and energy transfer more than temperature transfer, which if that was the case, a/c’s would not work and nor would heat pumps.
I've been looking for a simple explanation like this. The only way this could be better is if you showed an example of the physical devices for the indoor and outdoor units or parts. And thanks for the great video!
I used the exact solenoid with a high flow rate as the fluid pushes down on the oversized valve land for sealing at static pressure. But mine is on an oil accumulator to pre-lube a gas V-8 engine. It is energized with the key on so during starting, it quickly floods the main oil gallery (High-Flow, 1/2" NPT, Viton Rubber Seal; New surplus at 1/10th the cost of Name Brand oil accumulator companies;
with pressurized oil to the bearings. This would greatly extend the life of all "Stop-Start" engines in those vehicles. After being an ASE Master Tech since 78, I will argue a room of engineers under the table! 5,000hrs is the 150,000 mile equivalent that GM designs parts, materials and still make them to keep from paying CAFE a fine. It's a law passed by the Clinton administration.
Great job on the video.
To quote the unforgettable Terry Thomas.....'Oh I say!...what a perfectly splendid, top hole video!"Very clear diagrams, excellent narration, well explained. When I have to have one, I'll back-refer to this vid.!
This is the best channel for mechanical students. Thank you.
See our new video on how to build mechanical versions of electronic circuits? Watch here: ruclips.net/video/Zv9Q7ih48Uc/видео.html
This is the best explanation on RUclips of how an air conditioner works. Kudos to you.
I have a Carrier PURON heat pump system installed in 2007 and it is still working wonderful here in Pensacola FL with only a few breakdowns from minor parts from time to time!
I’ve been checking out your videos for a while now as a student in the HVAC program at Kennedy-King College here in Chicago IL. HOW WONDERFUL !!! 😊👍🏾
if they were all so magically efficient As everyone says they are, they would already be in all new homes. But they're not because they're more complex, have more parts, function poorly in outside temp extremes and are literally a pipe dream at this point.
Mine is between 360-420% efficient, depending on how cold it is outside and how high of a flow temperature I need.
I didn't pull these numbers out of a datasheet, they come from electric consumption and heat output monitoring... they're as real as they get.
For every kWh of electricity it uses, my heat pump provides between 3,6 - 4,2kWh of heat.
Granted, we don't live in Canada, Scandinavia or Siberia, we do get below 0ºC temps, but nothing as crazy as -20 or -40ºC
This "pipe dream" has been keeping our home at a comfy 21-23ºC and providing domestic hot water all winter.
The running cost is less than half of what we used to spend with our oil boiler, the level of comfort is miles better, thanks to increased flow rate and constant operation.
Also, fyi, heat pumps, solar thermal, etc. are already mandatory for new buildings in some countries.
The main problem I see with heat pumps is that many installers and sales people either have no clue or are dishonest.
They charge twice or thrice as much as they should, they sell you criminally oversized machines, they insist on putting in a buffer tank and secondary pumps when there's no need in many cases (and it's counterproductive, even)...
In winter uk (Oct to Mar ie 6months of the year!):
1. Lounge gets too hot at seated height
2. Lounge is very cold at foot level
3. Cannot air dry clothes in home anymore - Have to use Dryer - more electric)
4. Costs 3x more than summer
5. Is a nightmare and frustrating to understand operation for a typical end user
British homes are of then poorly insulated what causes problems.
That’s a great video, I really like that you stop to point us in the direction of other videos that explain the various stages in more detail. Really brilliant stuff, thanks.
Honestly these videos have made my life much easier
I wish you did a video with graphics. Such as within the pipes. Show each process in detail as it passes each component. Essentially combining all your videos in one. No complaints here. Love your work. I’m just asking as I learn better with pictures and visualizations. One of the reasons I’m attracted to your channel. Thank you
I’ll be honest that is much more complicated than I thought it was gonna be. Great explanation!!
It’s crazy to think the amount of knowledge you need to have just to be a red seal tradesman!!
Kudos
This is by far the best video explaining and illustrating how heat pump works. Some other ones on here seem to assume you already have a master's degree in HVAC to understand them.
a master's degree in HVAC?you need to have been constructed by NASA just to understand the basics!
Thankyou for explaining in such a way that i understand. I have watched other videos but it just left me more confused, now watching this short video I get it, thanks again.
How much energy does that compressor use? This is all nice, but is the electricity required for that compressor what uses electricity the most in this system?
Everything is relative. Water boils at 212 degrees F at sea level pressure which is 14.7 psi. Have seen it boil in a vacuum at room temperature and it can boil at hundreds of degrees in a high pressure boiler. This is the basis of a refrigeration system. By manipulating temperatures and pressures you can force a refrigerant to either evaporate or condense which will either absorb or release heat. Basically using a refrigerant to transfer heat from one area and release it in another area.
I don't understand one thing. The most common refrigerators such as R32 and R410A, have a boiling temperature at around -50 degree Celcius. Let's assume that the indoor temperature is 30 C and outdoor temperature is 30 C too. And we want to cool the place. How is it possible that the temperature of the refrigerant increases in the evaporator and drops in the condenser? In the evaporator, the refrigerant exchanges heat with the indoor air(30 C) and it warms. In the condenser, the refrigerant exchanges heat with the outdoor air(30 C) and it cools and condensed. How can you drop the temperature of the refrigerant to -50 degree C using the 30-degree C air? That's against the thermodynamics rules.
@@kaan2215 Get a pressure temperature chart for R-22 and follow along. I am going to use Farenheight. R-22, at 14.7 pounds pressure (atmospheric), has a boiling temp of around -13 degrees. Let's go thru a complete refrigeration cycle in a comfort AC system with 90 degrees ambient, 75 degrees in the conditioned space, a high side pressure of 250 psig, and a low side pressure of 65 psig. The compressor will compress the refrigerant to a high pressure, high temperature gas, and in this example of a high side pressure of 250 psig, its condensing temperature is 117 degrees. Now the condenser fan runs cooler 90-degree air over the condenser coil and cools this refrigerant below the 117 condensing temperature forcing the refrigerant to condense. This change of state, from a gas to a liquid, releases a large amount of heat, called latent heat. This refrigerant then leaves the condenser at basically the same pressure but now is a medium temperature liquid. This refrigerant then enters the evaporator thru an expansion device, which induces a pressure drop. In this example we now have a 65 PSIG evaporator coil, and at that pressure R-22 evaporates at around 37.5 degrees and it is forced to evaporate, and this change of state absorbs a large amount of BTU's from the warmer 75-degree room air that is passing over the evaporator coil. We are now left will low pressure, low temperature gas that goes back to the compressor to start our cycle all over again. It completely follows and can be explained by the laws of thermodynamics. Please let me know if there is something you don't understand and I can help you with it.
@@kaan2215 Its actual simple. Get a pressure temperature chart and follow along. We are going to use Fahrenheit and R-22 in a comfort air conditioning scenario, with 90 degree outside air and a 75 degree inside air, with a 250 PSIG high side pressure and a 65 PSIG low side pressure. Starting at the compressor, it compresses a low temperature, low pressure gas to a high temperature, high pressure gas and discharges this gas thru the hot gas line to the condenser at 250 PSIG .The condensing temperature of refrigerant at that pressure for R-22 is 117 degrees, and as the cooler outside 90-degree air passes over the condenser coil it cools the refrigerant below its condensing temperature and forces it to condense. This change of state, from a gas to a liquid, releases a tremendous amount of heat, called latent heat. We are now left with a high pressure, medium temperature liquid that leaves the condenser thru the liquid line and then enters the evaporator thru an expansion device, which induces a pressure loss and, in this example, leaves us with a 65 PSIG evaporator coil. R-22 at this pressure evaporates at around 37.5 degrees and since room air passing over the coil is 75 degrees this forces the refrigerant to evaporate. Again, a change of state, this time from a liquid to a gas, now absorbs a large amount of heat (from the room air) and now we are left with a low temperature, low pressure gas that returns to the compressor to start the whole refrigeration cycle over again. Completely follows and is explained by the laws of thermodynamics.
@@Howie875 So is it all about pressure? We manipulate boiling and condensing temperatures by changing pressure?
@@kaan2215Mostly about manipulating refrigerant to the proper pressures but then you also have to then manipulate the refrigerant temperature to then change its state from a liquid to a gas ( or vice versa) to complete this process.
Check this *HEAT PUMP GUIDE* here ➡️ ruclips.net/video/U3iL172VjAc/видео.html
6:43 The hot water tank doesn't feed the radiators, if it did, it would run out of hot water in a matter of minutes.
Keep in mind that heat pumps have high flow rate, they move over 600 liters of water per hour.
A heat pump needs between 30 - 90 minutes to heat up a 200 liter water tank.
If you moved all the water in the tank through the radiator circuit 3+ times per hour, the heat pump wouldn't be able to keep up with the dissipation rate.
DHW tanks for heat pumps aren't heated directly, a "serpentine" (spiral heat exchanging pipe) is used to heat the water in the tank, so there's an efficiency penalty.
Some tanks also come with auxiliary heating elements (resistors), which help speed up the heating process, but this comes at the cost of doubling electric consumption, which defeats the purpose of having a heat pump.
So, basically, the heat pump needs to feed the radiator circuit directly, for best results.
This is achieved by using a 3-way electrovalve, which is installed between the heat pump and everything else.
This electrovalve diverts the ouflowing hot water from the heat pump to either the radiator circuit or the water tank's internal "serpentine", as needed.
It's an "either or" kind of system, it won't do both DHW and radiator heating at the same time.
explained very well 👌
I LIKED THE ANIMATIONS!!!!!!!
Been heat pump manufacture 30 years, welcome communicate about HVAC
is there any way to recover the energy from the wasted heat in order to improove efficiency ?
ssllhh100 Hi, for an water source heat pump you can use this the wasted energy either heating or cooling if you have a series of outdoor units coupled together.
Can go for a vrf heat pump system. These allow simultaneous heating and cooling ruclips.net/channel/UCk0fGHsCEzGig-rSzkfCjMwvideos
Second law of thermodynamics, with every exchange, our energy storage, is becoming more and more diffuse and less and less usable. I'd imagine you could surround your heat pumps, with other heat pumps, until there was no usable energy left and it was requiring more energy to drive the pump, than was being extracted.
New VRF unit video here:➡️ ruclips.net/video/4i1XgcP1tmw/видео.html
Really good video. this is what i was looking for
Sponsored by a heat pump supplier!! So that's going to be really unbiased and objective.
We always try to find a sponsor relevant to the topic. The content is our own words, only the sponsor message is written by the sponsor.
If a person invented some free energy machine, they would still need to advertise as they are educating the market that there is a solution. Not everyone knows what this is or what it does and I have no motivation to go out and tell people, but the company is motivated to teach the public the benefits and the channel is motivated to pass on the information by revenue. Is it so bad that you got free access to useful information? Is it bad that you now think of that brand and the video maker gets paid for making a video? They never said they are the only ones to make this product or that there's is the best, only explained the tech.
Really, a very explanation for this heat pumps topic......thanks for video
great video thanks for the education!
I've learned more on this channel than my entire 4 years of engineering school
Maybe find a better engineering school then?
@@ramr7051 maybe you pay for it then?
Are there any health concerns for installing both units indoors? What is the physical properties of a heat pump system that prevents indoor installation of both units? e.g. Installing the "outdoor" unit at one end of a 40' attic and the "indoor" unit at the other end?
Even idiots like me (a historian, with zero knowledge of physics or engineering) can be very much enlightened and informed by this video. I always wondered how my f---g hot air pump worked. Thought it was by black magic. And yet, depend on it so thoroughly (live in Sweden). THANK YOU.
3:50 The boiling points are even lower in the low pressure part, right?
Great refresher!
Thank you. The best explanation I have seen 👍
Great video man. thanks the explanation
Great video
Hello Paul, I just discovered you RUclips channel. I think it is absolutely amazing. I'm on a quest to engineer the most sustainable home. I'm wondering if this is a topic you might make some videos on.
this is very useful, thank you
I apologize if this is mentioned somewhere in the video and I just missed it but I feel like its important to explain that the boiling point of the refrigerant mentioned was at atmospheric pressure. As pressure changes boiling point does too. 410a in an evaporator coil is usually at a boiling point between 36°f and 50°f this is why we get air in the 40-60 range leaving the coil.
Good tip. It makes more sense when you apply that information.
thanks
If i have immersion cooled ASICs pumping the dielctric fluid to a heat exchanger couldn’t I use that as a substitute for the compressor?
Here in Sweden the Nibe F1255 and Mitsubishi Ecodan are getting more and more populair with outside temp -30C they still are efficient!! We install them every day.
Great vid by the way!👍🏻
great
Your channel is amazing for videos and learning!! Love it!!
Incredible, great video and animation, thanks.
⚠️Learn (ADVANCED) *How Heat pumps works* here: ruclips.net/video/QykwWs3L1W8/видео.html⚠️
Are the expansion valves in this example one-way only devices? They only allow flow in one direction hence the non-return valves and the fact that there are two of them in this example. Thanks.
This channel is amazing…
3:20 - now I get it :) Thank you !
still difficult to me can you explain ?
Well explained, Thank you
I always love your videos very clear and crisp.
1:54 you forgot the accumulator. That is vital in a heat pump.
Awesome Video. I’m a new HVAC Tech and I just bought a house with a Trane Heat Pump Air to Air
How has it worked for you? Do you find it efficient? How cold does it get where you live ? I'm in Western Kanada, it's forced air furnaces everywhere up here. Very inefficient.
Great lesson! Could you please explain how HP dryers accomplish dehumidification parallel to cooling? In food processing, HPD are used for low temperature low humidity drying of thermally sensitive foods.
Best video explaining the working
I could spend all semester here!
the refrigerant temp is colder before or after it enters the outdoor unit ?
Should’ve started by explaining the physics and the goals of heat pumps before jumping in to explain the different types.
This video is so fuuuuukn quality 🫶
Can you drop the fans by leaving the pipes such that air will rise or fall through the exchanger by convection?
The blue tank in the middle of the thumbnail made me to try pick that up.lol.nice 3d effects
Thanks so much!
I have a question as I am see people stating heat pumps are efficient but when they utilize auxiliary heating system which works in conjunction with the heat pump when the outside temp is around 37 degrees. I used an amp clamp to see what the current use was with the heat pump V the auxiliary. in. the heat pump mode the current was 45 amps while when it was in the auxiliary mode the current was 34 amps. it appears it would be cheaper to heat me house with the auxiliary mode how can this be the case? Help please
You don't know what the actual heat output from the heat pump vs the aux heat is, you only know what the electrical input is. The electric element probably only outputs 1/3 of the heat that the heat pump will.
I smashed the subscribe button so hard after the first vid I saw. THANK YOU
Great video. Please clarify which is the liquid line and which is the vapor line. Thanks.
I lived in three places with heat pumps for a total of 8 years. Two of the pumps had to be replaced at significant cost. In 35 years with gas heat and airconditioning I never had to replace anything.
Except the gas!
Great video!
Great work your,videos are awesome, I need to make a project presentation at college can you please tell me how these type of animation explanations is made??
Is a pump needed between the hot water tank and the heat pump n an Air sourced heat pump?
Great video! Nice work. Thank you.
Why is the expansion valve and outdoor heat exchanger needed in heating mode? Can't the slightly cooled refrigerant from the inside exchanger just go right back to the compressor? Or does it need to return with low pressure?
Great question. I have the same one
Great explanation! Great work! Thanks @ engineering mindset
Enjoyed it... Thanks
Great 'happy hour' text at the top. A bit confused but it seems to do with different modes of the heat/compression relationship.
So do these heat pumps, pollute the atmosphere, in much the same way as do refrigerators? And if so, how are they, any better than normal, household gas boilers?
Ok...I get it. Thanks!! I get it why you cannot (or should not) install these entirely indoors.
Great job man
Those animations help so much. About to start our chapter on heat pumps in class today. This helps so so much!
The air to water system , what sort of temperatures as an estimate across most units would you get in the water storage heating coil with no electrical element assistance ? Do they have enough power to heat a house 3 to 4 bedroom rough size on the air to water heat pump alone ?
Thanks for sharing.
sir i have a question. what if i want to build my own mini electricity? through natural gas. since my place have own natural gas on underground. now i want to install heat exchanger on my genset. is it possible to do that? instead of using it's giant radiator. I'll just took it out then replace it with heat exchanger system? so could run it continuously everyday?
what a fantastic channel
Just curious when using a reversing valve can the expansion valves just be the basic thermal type or do they need to be an electronic expansion valve thanks
Hello, if you have a monocompressor and two splits or more units, how this behaivor is managed?
Excellent explanation as always. Thank you 🙏🏽
Thank you for video. Why reversing valve is not possible in air to water heat pump?
Love your video 🙏
Nice video but a pointer would be helpful. Sometimes the animation directs attention without a pointer, but a lot of times it doesn't.
Thanks for the video =)
hello , can anyone tell me how hot degrees celsius the fan delivery tube is in winter mode , if we have set 31 °C (full capacity for heating ) room temperature ?
Classic inverter heat pumps only have 1 expansion valve which works for Cooling and Heating. And on/off models have a small capillar pipe for Cooling the freon
I suddenly realized why they call the two lines that connect the outdoor unit to indoor hardware the 'vapor line' and the more narrow gauge 'liquid line'. Because of the reversing valve, the direction of flow on those two lines reverses flow when changing mode, but the larger vapor line always carries vapor, the more narrow gauge line carries mostly liquid. During heating the vapor line carries slightly superheated vapor to the indoor condensor, during cooling the room temperature vapor makes its way back to the compressor in the opposite direction. Presumably the indoor vapor line always comes off the top of the coils, the liquid line comes off the bottom, so gravity keeps fluid from going the wrong way and choking the compressor.
I appreciate the video, but one thing I'm trying to understand is how the indoor heat exchanger works. In cooling mode, warm air is pulled in, making the room cold. In heating mode, warm air is blown into the room. How does this work? Are there multiple fans?
I love everything about your channel. Even the ads. Kudos bro!
Glad you like them!