God Bless this guy! . Love !!! -- His sound quality alone exceeds most. I'm convinced this guy does his homework on everything in life. This was so relevant and helpful to anyone wanting to learn about humidity.
Just about one of the best, time sensitive explanations of this topics, both dealing with the physics, the human aspect, and the technological for HVAC. TY.
I’m an graduate from GTCC’s accredited HVACR program and this is great stuff!! Keep it up man. It really helps when I need a quick refresher on a subject and you hit every key detail.
Excellent explanation. People tend to mix up relative humidity with "absolute" humidity. He could've used some ratios just to illustrate how relative humidity can change with temperature, though.
Hi. I found your channel whilst looking for an explanation as to why my thermostat says it is 71 in my home, but the humidity is 80%, and I do not feel all that cool. Normally, at 73 F I start to feel a little chilled unless I am doing some sort of physical labour. Here is the situation. Maybe you can advise me what is happening? I lease an approximately 905 sq ft home that was built in 1926. The owners had an all electric HVAC system installed August '23. My heating bill last Winter was outrageous, and a friend told me that was because my furnace is electric. I had always had gas before this, and my bill was never remotely that high---close to $300 before I dropped the temp to 59 F and kept it there 24/7. Even after dropping the temp to 59 and feeling quite cold in here, my heating bill only dropped to about $240. I was so chagrined. Then, the hot and humid weather began (I live in the south). I feel hot in the house even though the HVAC is set to 71 and reads a temp of 71. I have little table top thermostats in each room of the house. No two areas have them same temp, but all areas have pretty high humidity---talking about 77%-80% as of May 2nd. At 71 I expect to feel uncomfortably cold, yet I feel hot and oily from the humidity. All windows and doors are kept closed. I am nervous to see what my upcoming electric bill will be. How can the temp in the living room, for example, read 71 yet the humidity read 80% ? The HVAC thermostat is in the living room. It seems to me that if the temp is really 71, the the humidity should not read 80%, and I should. not feel uncomfortably warm and oily from the humidity. I am worried because the temps here will soar into triple digits soon. We managed to squeak by in April without any triple digit days, but I think that is because most days were either overcast with rain in the forecast, or a high pressure system had moved in and dropped the outdoor temperature to a very comfortable temp in the lower to mid 60s. That is already changing. We are already getting temps in the mid to high 80s before the heat index is factored in. It is about to turn really hot soon. I would like to figure out what is going on and if there is anything to do to fix this problem. Thank you!!
Thank you! That was really comprehensive and helpful. How does turning on the air conditioner in my room affect all these factors? I'd really appreciate if you could clear that up for me.
So glad I found your channel recently. I really enjoy your videos. Should the temperature of the evaporator coil, be the same as the target indoor dewpoint temperature?
I just want to say I surely appreciate your valuable time that you take out your day to give us upcoming techs the Juelz needed to to be a great technician i surely learned more from you then the school I attended to secure my certification I just want to say thank you... I love the training you provide for your techs your awesome would love to work for you and that's funny coming from me with my boss mentality my goal is to hopefully be a competitor of yours someday but the meaning of me really writing this is my company just hired a new service mgr can u believe this guy is not allowing us junior techs to attend union school anymore says we wouldn't learn anything from there smfh I'm so pissed so this is why I appreciate you thnx bro keep the knowledge coming please if you get a chance can you go over electric heaters ohm testing amp reading isolation of elements etc... would be much appreciated
I'll be starting as an HVAC apprentice in a couple months, and from my physics background I think this video was aboslutely awesome. Your analogies are on point, they really help me understand the important concepts. Thanks!
Hi how to drop humidity in winter keeping a temperature in home. Ones is deshumidified, can we heat our supply air to stay warm. Or set point adjusted under the dew point thank to answer me Dom
And this was how thanks to Bryan Orr I lost my irrational fear to get indroduced in the psychrometrics field a couple of years before with his first podcasts.
I was looking for an answer why the humidity level in my apartment goes up to 91% at AC set to 25 degrees and goes down to 74% at AC set to 23 degrees ..? That’s because cold air can’t hold moisture and it evaporates? I live in the Middle East and I was told that AC is the best dehumidifier, did I get it right ? But at night time AC feels too cold and I need to change the settings to 24.5 or 25 degrees.. and the humidity level starts going up, shall I get a dehumidifier in this cases, for the night time ? Thanks for the video !
2:31 so i have too much moisture (actually its like rain) on my windows but on the INSIDE that got build up during the night (in winter). I would like to know what is going on in my house because the walls have mould signs. I must say there's no thermal insulation on the walls and the windows are single glass. Thanks
I'm wondering what your thoughts about running a standalone (plug-in) dehumidifier in your home in. This has been recommended on several sites but I'm wondering the true value of it. I certainly understand that relative humidity over 50% starts to get uncomfortable and that lower humidity is good and can allow you to even raise your temperature setpoint. However, the waste heat from the compressor is being dropped directly into my home (albeit the basement). this introduces an additional (and considerable sensible load) to the home. I haven't measures the flowrate or the temperature gain but it is normal fan speed over a 3" by 15" opening (0.3 ft^2) and the temp out is in the high 80's.
So more TOTAL humidity in the same given temperature can impair people from releasing heat from the body? So do people living in very high TOTAL humidity climates be prone to get overheated and heat stroke compared to lower total humidity with same temperature? Maybe it is easier to run in low humidity climates because of that
except that in low humidity environment your body will shed more water to cool itself, and you can dehydrate quicker (also affected by altitude)... people who run need to really hydrate a day in advance to be ready for that effect...
My indoor humidity shows 10% is that bad? I tried a humidifier but it only get's that up by like 5 or 10% in same room it's in, should I get a bigger/better humidifier? One hack I'm doing is running the shower hot for 10 minutes 2 to 3 times a days, that brings the humidity level to 50% in the whole apartment temporarily.
The molar mass of diatomic nitrogen and diatomic oxygen are both greater than the molar mass of water. Most of air is nitrogen and oxygen... that's why the water molecules float off into the sky and make clouds...
So do CHWTR AHU’s use re heat coils to control humidity? Just wondering cause we recently found one with no steam at the re heat coil and room was very cold and ductlines were saturated with condensation?
Can mold grow when it’s 57 degrees outside and the Humidity is 82 percent and my roommate is uncomfortable so he opened up the House. I am concerned there could be mold now in the house. Can he cause damage to the house is my question
Why haven’t someone come up with pulsing the air handler’s heat strips to allow long run times to reduce humidity in the home? The ultimate whole home dehumidifying solution, and no extra unit needed.
Yes, provided there is little or no carryover due to excessive face velocity (airflow over coil and fins). The closer the ADP (apparatus dew point) is to the DP of air entering coil, the lower the SHF (sensible heat factor) of heat absorbtion will be, therefore, the more latent heat, hence, more condensation. But at higher airflows, some carryover does occur, which adds some of the latent heat back into the air leaving coil due to friction drag and evaporation. This is wht matching coil size and blower speed is somewhat critical to proper humidity control in different climates and under different cooling loads.
My ac handler is inside the closet. The door is close. The door is solid has no hole. I found a pin hole after the handler in the insulation. I put a tape on it and now I have grow on the insulation. A friend suggested to change the in dilation and make it better i sulfate. What you digest?
So if I am running my air conditioning during the summer the air flowing over the evaporator coils is dropping its due point and this is why we have condensation. However, wouldn't this mean that the supply air is at 100% humidity and would this affect our ability to sweat? Or because the amount of water in the air is low regardless of the relative humidity because the air is cold, that it would not hinder our ability to sweat?
It is wrong to say that air "holds" more moisture when it is warmer. Air does not hold water vapor. Air is a mixture of gases, including water vapor, not a sponge. RH is a measure of how much energy is available to evaporate water relative to the amount of energy it takes to saturate the air with water vapor. Saturation is the point at which the number of water molecules leaving a liquid water source (evaporating) equals the number of water molecules (in the form of vapor) returning to the liquid water state (condensing). Higher temperature is higher energy, hence more evaporation. 30% RH means the energy available for evaporation is 30% of that required for saturation. Further, the "dew pont" is the temperature at which condensation occurs. To prevent condensation, the temperature must kept higher than the dew point. Window surfaces colder than the inside ambient air will condense the water vapor in your home when they are below the dew point. When the inside relative humidity is higher, the dew point gets closer to the ambient temperature so the window surfaces have to be less colder than the inside air to form condensation. When the relative humidity is 100%, the dew point equals the ambient temperature so any drop in temperature will cause condensation. In your house, condensation would recuce the amount of water in the air and thus lower the ambient humidity if there was no more water being added to the air and condensation will stop, but then the job of your humidifier is to keep adding water so condensation continues, potentially causing damage to window frames and inside walls and ceilings.
I run a business in Central FL & we've gotten an enormous influx of calls during summer months for the last 4yrs, interestingly enough not as many the 2nd year in business, about condensation forming tablespoons amount in dryers and the drum sweating. From my understanding this happens for about 3 different maybe 4 different reasons or so (in my industry). But reading your long comment was quite informative. Could/ does that mean temp, humidity & dew point are factors in play? And if so those metrics from outside &/ or even in the home? If someone's laundry room's Temperature is 77°F & 51% Relative Humidity That's a dew point of 57 I believe. No way the dryer is getting that cool if the temp is set at 77, no way without external influence. If outside air is working its way down the duct entering into the dryer drum, then, if it's outside air here in Florida the temperature is going to be hotter.... So why am I getting so many calls/ texts/ pics about it? I feel like I'm one comment away from understanding this.
Mr Bryan I am learning hvac ! English is my second language! My instructor told me saturation meaning liquid n vapor both exist! Yes that’s true! When I ask him said if I open with refrigerant cylinder to atmosphere it still saturated? He said yes! I don’t get it! For I understand meaning if saturation has to be in seal container! Liquid molecules go up become steam molecules, n steam molecules touch liquid come back to it! Rise molecules n come down molecules number equal! It’s call dynamic equilibrium! That’s real meaning for saturation! Even though water n refrigerant is big difference right! But saturation still meaning the same? how refrigerant be saturate with open pot or open Container? Mr Bryan can u please help me out n explain it please?
14.7 pounds per square inch! 😮 An avarage built human being of 5 ft 7 to 5 ft 9 weighing around 75-85 kgs, how much pressure is his body under, at all times, even without noticing! 😲
God Bless this guy! . Love !!! -- His sound quality alone exceeds most. I'm convinced this guy does his homework on everything in life. This was so relevant and helpful to anyone wanting to learn about humidity.
Just about one of the best, time sensitive explanations of this topics, both dealing with the physics, the human aspect, and the technological for HVAC. TY.
This guy deserves a medal! So simple and straightforward, thank you good sir!
This channel is going like a rocket.... all the way up
I’m an graduate from GTCC’s accredited HVACR program and this is great stuff!! Keep it up man. It really helps when I need a quick refresher on a subject and you hit every key detail.
Man, you're amazing! Great lesson on the basics of moisture in the air. Thank you!!
Excellent video, thank you for sharing your knowledge.
Helping engineers and technicians! Wonderful video thank you.
An excellent video with a clear and concise explanation, thanks.
thank you very much . You are easy to understand and so helpful !
Beautiful. Thanks for this information.
Super Simple explanation of Humidity!👌
Excellent explanation and video production. Thank you!
Excellent education video. Making it Brilliant
Tea / Coffee was a wonderful analogy.
Straight to the point. Good video!
I’m old but now I get it thanks to your excellent explanation. Thank you👍
Thanks for your emazing video👏👏🌟👍👍💗
I’m from Thailand thank you for this lesson.
Excellent explanation. Thanks a bunch 🙏🏾
The best explanation of humidity what I found..
Thanks! :)
Good job
Great stuff and very well explained. Thanks!
Dude the way you explain any topic 👍
very good explanation, thank you 👌
Good job! 👍
just what i was looking for, thanks!
I understand. Thanks for the video. Thumbs up. 👍
This was really helpful, thankyou 🙏
Very simple 🔊
very helpful. Thank you
Excellent explanation. People tend to mix up relative humidity with "absolute" humidity.
He could've used some ratios just to illustrate how relative humidity can change with temperature, though.
Thank you
Very helpful discussion. Thanks.;
Hi. I found your channel whilst looking for an explanation as to why my thermostat says it is 71 in my home, but the humidity is 80%, and I do not feel all that cool. Normally, at 73 F I start to feel a little chilled unless I am doing some sort of physical labour. Here is the situation. Maybe you can advise me what is happening?
I lease an approximately 905 sq ft home that was built in 1926. The owners had an all electric HVAC system installed August '23. My heating bill last Winter was outrageous, and a friend told me that was because my furnace is electric. I had always had gas before this, and my bill was never remotely that high---close to $300 before I dropped the temp to 59 F and kept it there 24/7. Even after dropping the temp to 59 and feeling quite cold in here, my heating bill only dropped to about $240. I was so chagrined.
Then, the hot and humid weather began (I live in the south). I feel hot in the house even though the HVAC is set to 71 and reads a temp of 71. I have little table top thermostats in each room of the house. No two areas have them same temp, but all areas have pretty high humidity---talking about 77%-80% as of May 2nd. At 71 I expect to feel uncomfortably cold, yet I feel hot and oily from the humidity. All windows and doors are kept closed. I am nervous to see what my upcoming electric bill will be. How can the temp in the living room, for example, read 71 yet the humidity read 80% ? The HVAC thermostat is in the living room. It seems to me that if the temp is really 71, the the humidity should not read 80%, and I should. not feel uncomfortably warm and oily from the humidity.
I am worried because the temps here will soar into triple digits soon. We managed to squeak by in April without any triple digit days, but I think that is because most days were either overcast with rain in the forecast, or a high pressure system had moved in and dropped the outdoor temperature to a very comfortable temp in the lower to mid 60s. That is already changing. We are already getting temps in the mid to high 80s before the heat index is factored in. It is about to turn really hot soon.
I would like to figure out what is going on and if there is anything to do to fix this problem. Thank you!!
Hi, first, you must record, temperature,
humidity, Dew point, to have good basic
this is what I try to do first,recording all this points.
Interesting! 👍👍
I did enjoy myself thank you.
Great video
Thank you! That was really comprehensive and helpful. How does turning on the air conditioner in my room affect all these factors? I'd really appreciate if you could clear that up for me.
The A/C removes the heat and humidity from the room
Thank you❤️
Nice and clear, now I understand.
The next time your windshield fogs up, take a moment to think about the temperature and relative humidity on the two sides of the glass.
Good tip!
Best explanation ❤️
So glad I found your channel recently. I really enjoy your videos.
Should the temperature of the evaporator coil, be the same as the target indoor dewpoint temperature?
It depends on the dog
Thanks.. now I understand bc my house is so humid and hot and my central air isn’t working well at all so it’s really muggy and I feel very sticky
I just want to say I surely appreciate your valuable time that you take out your day to give us upcoming techs the Juelz needed to to be a great technician i surely learned more from you then the school I attended to secure my certification I just want to say thank you... I love the training you provide for your techs your awesome would love to work for you and that's funny coming from me with my boss mentality my goal is to hopefully be a competitor of yours someday but the meaning of me really writing this is my company just hired a new service mgr can u believe this guy is not allowing us junior techs to attend union school anymore says we wouldn't learn anything from there smfh I'm so pissed so this is why I appreciate you thnx bro keep the knowledge coming please if you get a chance can you go over electric heaters ohm testing amp reading isolation of elements etc... would be much appreciated
I'll be starting as an HVAC apprentice in a couple months, and from my physics background I think this video was aboslutely awesome. Your analogies are on point, they really help me understand the important concepts. Thanks!
Thanks a lot. It was really helpful
Does too much of rain, makes a hot Temperature country humid ?
Bryan Orr - you are one talented teacher! I had zero interest in HVAC but now I think it's the most fascinating subject there is.
That's a very kind thing to say
There's an award category in it's own right!⛡
Hi
how to drop humidity in winter keeping a temperature in home.
Ones is deshumidified, can we heat our supply air to stay warm.
Or set point adjusted under the dew point
thank to answer me
Dom
Can you do a video on Ultrasonic Leak Detector?
Your thoughts and experience with it Good, Bad, Or Ugly
Compared to heated diode
Trash.
man you are amazing ..... i work in petra engineering industries and i anderstand what all you talking about this video>>>>
Dew point = The temperature at which moisture condenses
Awesome 🤟 explanation man!!!
Thx
And this was how thanks to Bryan Orr I lost my irrational fear to get indroduced in the psychrometrics field a couple of years before with his first podcasts.
Do you have a link to that podcast.
I HATE psychometrics.
Loved it.. Thank you sir😊😊
Keep watching
I was looking for an answer why the humidity level in my apartment goes up to 91% at AC set to 25 degrees and goes down to 74% at AC set to 23 degrees ..? That’s because cold air can’t hold moisture and it evaporates?
I live in the Middle East and I was told that AC is the best dehumidifier, did I get it right ?
But at night time AC feels too cold and I need to change the settings to 24.5 or 25 degrees.. and the humidity level starts going up, shall I get a dehumidifier in this cases, for the night time ?
Thanks for the video !
Love this!
Nice job!
Will dew point limit supply air temperature leaving an evaporator?
2:31 so i have too much moisture (actually its like rain) on my windows but on the INSIDE that got build up during the night (in winter). I would like to know what is going on in my house because the walls have mould signs. I must say there's no thermal insulation on the walls and the windows are single glass. Thanks
Plus one. Want to know the same thing…Anybody else have an explanation for this?
I'm wondering what your thoughts about running a standalone (plug-in) dehumidifier in your home in. This has been recommended on several sites but I'm wondering the true value of it. I certainly understand that relative humidity over 50% starts to get uncomfortable and that lower humidity is good and can allow you to even raise your temperature setpoint. However, the waste heat from the compressor is being dropped directly into my home (albeit the basement). this introduces an additional (and considerable sensible load) to the home. I haven't measures the flowrate or the temperature gain but it is normal fan speed over a 3" by 15" opening (0.3 ft^2) and the temp out is in the high 80's.
Didn't have to care about humidity until I have to care for my piano, which is technically alive?
Easily explained... Thanks
Glad it helped
Let it rain! Rain dance!
Good information. Thanks : )
So more TOTAL humidity in the same given temperature can impair people from releasing heat from the body? So do people living in very high TOTAL humidity climates be prone to get overheated and heat stroke compared to lower total humidity with same temperature? Maybe it is easier to run in low humidity climates because of that
except that in low humidity environment your body will shed more water to cool itself, and you can dehydrate quicker (also affected by altitude)... people who run need to really hydrate a day in advance to be ready for that effect...
And this is why you do load calculations.
Best!
Man you’re awesome.
Thanks now i can can undrestand IT, There i one ting i Wonder about, Hvow can i calculete the dew point ?
looking forward to Your ansver
Thanks!
My indoor humidity shows 10% is that bad? I tried a humidifier but it only get's that up by like 5 or 10% in same room it's in, should I get a bigger/better humidifier? One hack I'm doing is running the shower hot for 10 minutes 2 to 3 times a days, that brings the humidity level to 50% in the whole apartment temporarily.
Great explanation. Thanks.
how is water vapour lighter than air?
The molar mass of diatomic nitrogen and diatomic oxygen are both greater than the molar mass of water. Most of air is nitrogen and oxygen... that's why the water molecules float off into the sky and make clouds...
@@lylestavast7652 thank you
If this is the way you teach Me. Orr, I want to enroll at your school. Where's it located?
So do CHWTR AHU’s use re heat coils to control humidity? Just wondering cause we recently found one with no steam at the re heat coil and room was very cold and ductlines were saturated with condensation?
Can't wait until February 6th
Can mold grow when it’s 57 degrees outside and the Humidity is 82 percent and my roommate is uncomfortable so he opened up the House. I am concerned there could be mold now in the house. Can he cause damage to the house is my question
Why haven’t someone come up with pulsing the air handler’s heat strips to allow long run times to reduce humidity in the home? The ultimate whole home dehumidifying solution, and no extra unit needed.
Or you could get a variable speed blower with a dehumidification thermostat.
Justin Beaty I do! Trane/Aprilaire.
The Venstar Colortouch T5900 model thermostat has an option to run heat strips while dehumidifying. Only one I’ve seen so far.
The greater the difference is between dew point and evaporator temperature will determine how much condensation there is?
Yes, provided there is little or no carryover due to excessive face velocity (airflow over coil and fins). The closer the ADP (apparatus dew point) is to the DP of air entering coil, the lower the SHF (sensible heat factor) of heat absorbtion will be, therefore, the more latent heat, hence, more condensation. But at higher airflows, some carryover does occur, which adds some of the latent heat back into the air leaving coil due to friction drag and evaporation. This is wht matching coil size and blower speed is somewhat critical to proper humidity control in different climates and under different cooling loads.
My ac handler is inside the closet. The door is close. The door is solid has no hole. I found a pin hole after the handler in the insulation. I put a tape on it and now I have grow on the insulation. A friend suggested to change the in dilation and make it better i sulfate. What you digest?
✅
So if I am running my air conditioning during the summer the air flowing over the evaporator coils is dropping its due point and this is why we have condensation. However, wouldn't this mean that the supply air is at 100% humidity and would this affect our ability to sweat? Or because the amount of water in the air is low regardless of the relative humidity because the air is cold, that it would not hinder our ability to sweat?
It is wrong to say that air "holds" more moisture when it is warmer. Air does not hold water vapor. Air is a mixture of gases, including water vapor, not a sponge. RH is a measure of how much energy is available to evaporate water relative to the amount of energy it takes to saturate the air with water vapor. Saturation is the point at which the number of water molecules leaving a liquid water source (evaporating) equals the number of water molecules (in the form of vapor) returning to the liquid water state (condensing). Higher temperature is higher energy, hence more evaporation. 30% RH means the energy available for evaporation is 30% of that required for saturation. Further, the "dew pont" is the temperature at which condensation occurs. To prevent condensation, the temperature must kept higher than the dew point. Window surfaces colder than the inside ambient air will condense the water vapor in your home when they are below the dew point. When the inside relative humidity is higher, the dew point gets closer to the ambient temperature so the window surfaces have to be less colder than the inside air to form condensation. When the relative humidity is 100%, the dew point equals the ambient temperature so any drop in temperature will cause condensation. In your house, condensation would recuce the amount of water in the air and thus lower the ambient humidity if there was no more water being added to the air and condensation will stop, but then the job of your humidifier is to keep adding water so condensation continues, potentially causing damage to window frames and inside walls and ceilings.
AMEN!🙏🏼
He specified that air doesn’t technically “hold” humidity (2:45).
I run a business in Central FL & we've gotten an enormous influx of calls during summer months for the last 4yrs, interestingly enough not as many the 2nd year in business, about condensation forming tablespoons amount in dryers and the drum sweating.
From my understanding this happens for about 3 different maybe 4 different reasons or so (in my industry).
But reading your long comment was quite informative.
Could/ does that mean temp, humidity & dew point are factors in play? And if so those metrics from outside &/ or even in the home?
If someone's laundry room's
Temperature is 77°F & 51% Relative Humidity
That's a dew point of
57 I believe. No way the dryer is getting that cool if the temp is set at 77, no way without external influence. If outside air is working its way down the duct entering into the dryer drum, then, if it's outside air here in Florida the temperature is going to be hotter....
So why am I getting so many calls/ texts/ pics about it?
I feel like I'm one comment away from understanding this.
I was looking for a simple breakdown as if you are explaining this to a 4 year old and instead I got cranial bleeding...
hi i have a problem in MRI machine room the humidity is very high it temperature 16 degree c and return air 27 degree celsius plz reply me
Mr Bryan I am learning hvac ! English is my second language! My instructor told me saturation meaning liquid n vapor both exist! Yes that’s true! When I ask him said if I open with refrigerant cylinder to atmosphere it still saturated? He said yes! I don’t get it! For I understand meaning if saturation has to be in seal container! Liquid molecules go up become steam molecules, n steam molecules touch liquid come back to it! Rise molecules n come down molecules number equal! It’s call dynamic equilibrium! That’s real meaning for saturation! Even though water n refrigerant is big difference right! But saturation still meaning the same? how refrigerant be saturate with open pot or open Container? Mr Bryan can u please help me out n explain it please?
Too much information but less details. Is there a video to learn all what he said in details?
So if I use a dehumidifier.
A/C will be more efficient in a high humidity area?
14.7 pounds per square inch! 😮
An avarage built human being of 5 ft 7 to 5 ft 9 weighing around 75-85 kgs, how much pressure is his body under, at all times, even without noticing! 😲
#RH
Tho it can b tough following these vids r gospel
like
Huh
Mr. Carlos, you don't look that clean to me, get a shave Gaborone.