This is such a great playlist. I was writing a letter to my father and asked him why an air conditioner works because he has been an HVAC guy for most of his life. From his prison cell of almost 10 years, he was able to draw me a very similar diagram. Given that I am somewhere in between my 2nd and 3rd year of aerospace engineering, I was astonished at his ability to explain such a concept with just a pen and paper where most of my instructors had not fully succeeded. I thought I'd share that story because it hits home pretty well. Thanks for this. I have much to share with him upon his liberation.
I was about to comment that. This is not only Engineering. Thermo applies for Sciences as well, and not for Computer Engineering, not much for Electrical or Civil. I mean, I am a ChemE and thermo is deep within us and the Mechanical guys. I don't get why they are focusing on it. Maybe they should make it more clear what lines are being studied and why. I think they are just taking the most applied courses of engineering and they will go around.. Thermo, Fluid Mech, Heat transfer, electrical systems, Static mechanics etc.
Herbert Barrirt Dan Victor Be patient. This is only episode 11 in a 46-episode series that needs to cover several, unrelated facets of engineering. It makes sense that they would spend a few episodes focusing on a specific discipline before moving on to the next one.
Dan Victor. I disagree. I'm a civil engineer and I use a lot of thermodynamics. Maybe not as much as other areas, but it's still a lot, specially in Hydraulics (Dams, pipes and others) and Environmental.
As far as social impact goes, electric refrigeration is probably one of the top 5 engineering solutions of all time, right there with the wheel, iron smelting, movable type, radio, and computerized automation. No way the world population is where it is today if the food to feed all these people spoils at its natural rate.
She did miss out a bit i think on the properties of the refrigerant and other gases . As being a mechanical engineer we are aware of these things . Its basically about pressure and temperature . Everybody knows water boils at 100 Degrees but not everyone is aware that boiling point of liquid changes with the change in pressure . If pressure increases boiling point increases and if the pressure decreases the boiling point decreases . For example at an altitude of 20000 feet water boils at near 40 or 44 degrees celsius because the pressure is less at that altitude . The same happens in a refrigerator . When the compressor compresses the gaseous refrigerant its pressure increases so does its boiling and condensation temperature . And the heat because of compression of the gas is rejected to the atmosphere in the condenser and the refrigerant condenses . The expansion valve then reduces the pressure of that liquid refrigerant thus reducing its boiling point and temperature . this low temperature refrigerant is the passed on to the evaporator to absorb the heat and cool the surroundings .
She did miss out a bit i think on the properties of the refrigerant and other gases . As being a mechanical engineer we are aware of these things . Its basically about pressure and temperature . Everybody knows water boils at 100 Degrees but not everyone is aware that boiling point of liquid changes with the change in pressure . If pressure increases boiling point increases and if the pressure decreases the boiling point decreases . For example at an altitude of 20000 feet water boils at near 40 or 44 degrees celsius because the pressure is less at that altitude . The same happens in a refrigerator . When the compressor compresses the gaseous refrigerant its pressure increases so does its boiling and condensation temperature . And the heat because of compression of the gas is rejected to the atmosphere in the condenser and the refrigerant condenses . The expansion valve then reduces the pressure of that liquid refrigerant thus reducing its boiling point and temperature . this low temperature refrigerant is the passed on to the evaporator to absorb the heat and cool the surroundings .
That would have also great to learn all that from our favorite power hank but she is also doing good and her accent is really very impressive like the way benedict cumberbatch speaks.
You can do this even more directly using the Peltier effect. Also, when you think about it, a computer sorting a list is also using energy to reduce the entropy in its memory. There's a direct relationship between information entropy and thermodynamic entropy, which is kind of weird but makes perfect sense at the same time.
Good to keep in mind though, that since entropy can never decrease in the universe, you're adding energy BUT also producing a lot MORE heat than you're taking away; thus still increasing entropy. Same as the computer example.
Felix Guo you can decrease entropy in an area by increasing the entropy of the things around it. Ie a fridge cools water into ice but vents out a lot of heat.
this has helped me soooooo much Thx This is well explained ThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThx
Can someone answer me a quick little fluid dynamics question? I have an exam question here that's simply: How can you increase the maximum flow of a Laval nozzle with fixed geometry? And I'm really confused. Is the answer simply that you can't? I'm unsure and my script doesn't exactly help me.
I'm having hard time understanding the concept of heat engines and how refrigerators work in a detailed-manner. Damn, I guess I'll read and explore more on other resources. I'm taking engineering in the next two months, hopefully I can finish this series before my college starts. I wanna be prepared.
Great host although it seems like your voice is straining to talk for such long periods. Consider vocal excercises to improve your range. You'll find it improveds speeech
It's great that you point out that solar panels and wind turbines are a great alternative but why don't you point out the amount of energy and resources required to build these items and the hazardous-waste left over after producing them
because the topic is thermodynamic cycles involving heat and work within a device. solar is a great alternative to get a relatively unending source of electrical energy to produce work. comparing the pros and cons of the industrial manufacturing processes to produce the devices that employ these cycles is another conversation. refrigerators also require tons of energy and resources to produce and those processes also leave hazard waste behind. mining for metals, producing viable refrigerants in chemical plants, manufacturing the plastic linings from petroleum etc. etc. If it helps or matters at all I am a licensed PE in mechanical engineering working for an industrial consulting firm with a focus on these cycles.
Because that's not the point of the video and the argument is stupid anyway. All energy generation methods need energy and materials to build them in the first place. *Or do you think the steel and concrete for building a gas/coal/nuclear power plant just fall from the sky and their fuel magically appears on their doorstep?* The hazardous waste (green house gases, nuclear waste, emissions in general) left over from those types of power plants not only in construction but even more importantly while in operation is far worse. Solar panels and wind turbines typically repay their manufacturing energy in 2 or 3 years, but can even go as low as less than a year depending on technology and location. After that they produce for "free".
I am very sorry but that was the worst explanation for refrigeration I have ever heard. I now understand why I have to teach refrigeration basics to the cadets who come out of school. Sorry again I know you mean well and I love your site. For those who were confused Pretend you put a pot of water on the stove turned the flame on high and went out for a beer. Water boils at 100 C the water will heat up to 100 C and stay there. Not getting any hotter, the pot will stay near that temp and be fine , until the water boils away. After the water is gone the pot melts and your wife is pissed. The water was keeping the pot cool I know 100 C seems hot but its way colder then fire. It takes energy to make something boil or even evaporate. Thats why your hand feels cool when you poor rubbing alcohol on it and blow. We make freon it boils at what ever temp we want say at a nice 5 C to keep that beer cold. Second water does not always boil at 100 C think of a pressure cooker higher pressure means that it boils at over 100 C or a persons blood boiling in outer space It boils there because the pressure was 0 so low that it boils at your body temp. ( I know not exactly correct but easy to picture) Third steam turns back into water at 100 C same temp. same temp I know sounds wrong but its true. So you have 2 radiators 1 inside 1 out. A compressor that is sucking on the radiator inside and pushing into the radiator outside. Just before the radiator inside your home there is a blank with a tiny hole in it so only a small bit of freon can get through. There is a fan on both radiators. You turn of the compressor the press in the inside radiator goes down while the outside radiator press goes up. Remember there is that blank only letting a small amount of freon to flow. the pressure outside goes up while the fan on the radiator keeps it at outside temp. ( compressing any gas makes it hot. More you compress it the more the temp goes up) Remember boiling temp goes up when pressure goes up and the boiling temp is also the temp it condences at. the pressure goes up enough with the temp staying the same that it turns back into a liquid. It puts out a lot of heat when this happens. That liquid freon now flows to your inside radiator ( through the small hole in the blank that maintains the pressure difference) where it now boils at a nice 10 C . The fan inside blows air over the radiator keeping it warm enough to boil the freon and cooling your home. The compressor now starts it all over again. A cycle. sounds complicated but really easy when you go over it a few times. Sorry for the super long post. Again I love your site just hate this vid. Tom
Thank you for taking the time to explain, I can't listen to the person in this video. Last month I repaired my totally frosted freezer by adding a 16" long copper wire wrapped around the heating defrost coil. So far the freezer hasn't frosted up again.
She's explaining everything like she is explaining to a kindergartner, as an engineering student it is much helpful.
This is such a great playlist. I was writing a letter to my father and asked him why an air conditioner works because he has been an HVAC guy for most of his life. From his prison cell of almost 10 years, he was able to draw me a very similar diagram. Given that I am somewhere in between my 2nd and 3rd year of aerospace engineering, I was astonished at his ability to explain such a concept with just a pen and paper where most of my instructors had not fully succeeded. I thought I'd share that story because it hits home pretty well. Thanks for this. I have much to share with him upon his liberation.
Why he was imprisoned.
She is the perfect host for this. This is the series that keeps be coming back!
at this point its essentially Crash Course Thermodynamics :P
I was about to comment that. This is not only Engineering. Thermo applies for Sciences as well, and not for Computer Engineering, not much for Electrical or Civil. I mean, I am a ChemE and thermo is deep within us and the Mechanical guys. I don't get why they are focusing on it.
Maybe they should make it more clear what lines are being studied and why.
I think they are just taking the most applied courses of engineering and they will go around.. Thermo, Fluid Mech, Heat transfer, electrical systems, Static mechanics etc.
Herbert Barrirt Dan Victor Be patient. This is only episode 11 in a 46-episode series that needs to cover several, unrelated facets of engineering. It makes sense that they would spend a few episodes focusing on a specific discipline before moving on to the next one.
All engineering is basically thermodynamics and incorporates a lot of it since there aren't many systems where energy is not involved
Dan Victor. I disagree. I'm a civil engineer and I use a lot of thermodynamics. Maybe not as much as other areas, but it's still a lot, specially in Hydraulics (Dams, pipes and others) and Environmental.
I lost track of the lessons because I kept looking at that cool shelf in the background. I'm gonna build one of those
As far as social impact goes, electric refrigeration is probably one of the top 5 engineering solutions of all time, right there with the wheel, iron smelting, movable type, radio, and computerized automation. No way the world population is where it is today if the food to feed all these people spoils at its natural rate.
The transistor feels left out from this list.
I lose proper understanding about 3 minutes in most times 😂 but it's still pretty interesting to watch.
Yeah, I got the same impression - she got some well memorized stuff to say, but not much effort to actually explain anything.
The intro to these are so cool!
Great videos. I'm just getting started "Eng 101" with the terms and theories of Engineering so this is much appreciated.
My two loves: dr. Shini and thermodynamics
She did miss out a bit i think on the properties of the refrigerant and other gases . As being a mechanical engineer we are aware of these things . Its basically about pressure and temperature . Everybody knows water boils at 100 Degrees but not everyone is aware that boiling point of liquid changes with the change in pressure . If pressure increases boiling point increases and if the pressure decreases the boiling point decreases . For example at an altitude of 20000 feet water boils at near 40 or 44 degrees celsius because the pressure is less at that altitude . The same happens in a refrigerator . When the compressor compresses the gaseous refrigerant its pressure increases so does its boiling and condensation temperature . And the heat because of compression of the gas is rejected to the atmosphere in the condenser and the refrigerant condenses . The expansion valve then reduces the pressure of that liquid refrigerant thus reducing its boiling point and temperature . this low temperature refrigerant is the passed on to the evaporator to absorb the heat and cool the surroundings .
come on! make this simpler! MY MIND IS ABOUT TO BURST.
Glad to know when I get stuck doing the same thing I'm just playing my part in a powerful cycle.
Thank you so much , you saved me in my school and now in college
Wow, finally understood how it worked. Thanks :)
i cant wait for the next episode ... fluid momentum! like shockwaves thru substances. Vacuums and compression!
I love crash course, but can't get past this presenters voice to enjoy the information.
"Freon" is to "refrigerant" as "Kleenex" is to "tissue". The brand name became synonymous.
The best explanation of a heat pump, i finally understood every bit of how it works
"Lets learn and then repeat" lmao at least I got that down in uni
Thank you for making me smarter.
seemed to gloss over the bit about the expansion valve
yeah, I mean I know this isn't intended as a refrigeration course but it would be interesting to understand more
She did miss out a bit i think on the properties of the refrigerant and other gases . As being a mechanical engineer we are aware of these things . Its basically about pressure and temperature . Everybody knows water boils at 100 Degrees but not everyone is aware that boiling point of liquid changes with the change in pressure . If pressure increases boiling point increases and if the pressure decreases the boiling point decreases . For example at an altitude of 20000 feet water boils at near 40 or 44 degrees celsius because the pressure is less at that altitude . The same happens in a refrigerator . When the compressor compresses the gaseous refrigerant its pressure increases so does its boiling and condensation temperature . And the heat because of compression of the gas is rejected to the atmosphere in the condenser and the refrigerant condenses . The expansion valve then reduces the pressure of that liquid refrigerant thus reducing its boiling point and temperature . this low temperature refrigerant is the passed on to the evaporator to absorb the heat and cool the surroundings .
i mastered the repetition of this video
That would have also great to learn all that from our favorite power hank but she is also doing good and her accent is really very impressive like the way benedict cumberbatch speaks.
I know that this is a little bit off from engineering but who here would like a crash course criminology
Madam thank you so much, you really a good teacher
dude there was a pickle rick in that pot lol
you simplified then my physics professor couldn't in 30 minutes
I love this series and you Ms Somara :D
Engineers really care about getting the most efficient work out possible
Thanks I've always wanted to know how a fridge works. I found it pretty wierd that you can all energy to something to make it colder.
even weirder/ more counter-intuitive are the gas fired camping fridges. You burn gas to make something cold.
You can do this even more directly using the Peltier effect.
Also, when you think about it, a computer sorting a list is also using energy to reduce the entropy in its memory. There's a direct relationship between information entropy and thermodynamic entropy, which is kind of weird but makes perfect sense at the same time.
yondaime500 you're right I never even thought about the computer one
Good to keep in mind though, that since entropy can never decrease in the universe, you're adding energy BUT also producing a lot MORE heat than you're taking away; thus still increasing entropy. Same as the computer example.
Felix Guo you can decrease entropy in an area by increasing the entropy of the things around it. Ie a fridge cools water into ice but vents out a lot of heat.
I finally understand "the phase change "
Annoying Orange at 8:01 😂
I really need this for my semester
Very pretty........... The theory
Nice IK cameo!
You can work and research heat engines, refrigerators and cycles following the career of Mechanical Engineering.
God I love that series
THANK YOU. We skipped refrigeration in school.
Try to find annoying orange, he’s in there somewhere :3
Also pickle rick
this has helped me soooooo much
Thx
This is well explained
ThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThxThx
i am tell one advice that make you life better !
Cool Story Bro.
She lives in a gravity free space.....
See her background
Can someone answer me a quick little fluid dynamics question?
I have an exam question here that's simply:
How can you increase the maximum flow of a Laval nozzle with fixed geometry?
And I'm really confused. Is the answer simply that you can't? I'm unsure and my script doesn't exactly help me.
RICK is inside the POT.
She goes about 100 miles an hour. I think 80 miles an hour would be more understandable
DEAR JESUS SHE IS GORGEOUS....
RIGHT?
cant keep up.
Tunnel Vision We're allowed to still have crushes on our teachers :)
why does the fluid need to be repressurized in the heat engine?
amazing
Don't listen to haterz
I wished I would have seen the sterling engine on this episode...
Cool!
Safir
hanif raka Greetings
Aren't freons banned ? To my knowledge they are banned in the EU but is it just the EU or is this video simplified?
hasan kharfan I think the EPA said by 2022 any non HFC'S will be banned in the states.
Thanks
HELP ME! I DONT GET IT :(
Freon? I thought it had been banned.
partialintegral it has. The EPA is phasing out the use of anything with chlorine in it.
But its name has sticked as slang for any fluid used for refrigeration.
James Linton Don't be surprised if the current clowns throw away those regulations too.
Not the ones that are not reacting with oxgen like R134
? if another Big Bang occurred. Would our universe get scattered and a new space would occupy our place in that 2nd Big Bang universe?
It's just not that there is any kind 6th that I empathize
My fridge runs on cyclopentane. No more CFCs, tyvm
Are you in Europe?
@@gregorymalchuk272 yes
expansion valve
not expansion value
Yesterday. It was avocado day
It’s my birthday! I’m turning 13!
Happy Birthday!
Thanks!
Happy birthday
Hannah Sharp Thanks, but it’s not my birthday anymore 😂
Happy birthday!
Okay
Belated happy birthday:)
I'm having hard time understanding the concept of heat engines and how refrigerators work in a detailed-manner. Damn, I guess I'll read and explore more on other resources.
I'm taking engineering in the next two months, hopefully I can finish this series before my college starts. I wanna be prepared.
Hah! Bananas in Pyjamas!
I'm Pickle Rick!
Great host although it seems like your voice is straining to talk for such long periods. Consider vocal excercises to improve your range. You'll find it improveds speeech
Did anybody see the annoying orange in the fridge?
Shini
So posh!
It's great that you point out that solar panels and wind turbines are a great alternative but why don't you point out the amount of energy and resources required to build these items and the hazardous-waste left over after producing them
because the topic is thermodynamic cycles involving heat and work within a device. solar is a great alternative to get a relatively unending source of electrical energy to produce work. comparing the pros and cons of the industrial manufacturing processes to produce the devices that employ these cycles is another conversation. refrigerators also require tons of energy and resources to produce and those processes also leave hazard waste behind. mining for metals, producing viable refrigerants in chemical plants, manufacturing the plastic linings from petroleum etc. etc. If it helps or matters at all I am a licensed PE in mechanical engineering working for an industrial consulting firm with a focus on these cycles.
Because that's not the point of the video and the argument is stupid anyway. All energy generation methods need energy and materials to build them in the first place. *Or do you think the steel and concrete for building a gas/coal/nuclear power plant just fall from the sky and their fuel magically appears on their doorstep?* The hazardous waste (green house gases, nuclear waste, emissions in general) left over from those types of power plants not only in construction but even more importantly while in operation is far worse.
Solar panels and wind turbines typically repay their manufacturing energy in 2 or 3 years, but can even go as low as less than a year depending on technology and location. After that they produce for "free".
I thought the solar panels and wind turbines reference was awkward and out-of-place in a heat cycle presentation.
Second
Super Savage Sports
View
first
I'm just a child
building better refrigerators? what about planned obsolence?!
Is it me or is the refrigerator cycle having an expansion VALUE?
I am very sorry but that was the worst explanation for refrigeration I have ever heard. I now understand
why I have to teach refrigeration basics to the cadets who come out of school. Sorry again I know you
mean well and I love your site. For those who were confused
Pretend you put a pot of water on the stove turned the flame on high and went out for a beer.
Water boils at 100 C the water will heat up to 100 C and stay there. Not getting any hotter, the
pot will stay near that temp and be fine , until the water boils away. After the water is gone the pot
melts and your wife is pissed. The water was keeping the pot cool I know 100 C seems hot but
its way colder then fire. It takes energy to make something boil or even evaporate. Thats why
your hand feels cool when you poor rubbing alcohol on it and blow. We make freon it boils
at what ever temp we want say at a nice 5 C to keep that beer cold.
Second water does not always boil at 100 C think of a pressure cooker higher pressure
means that it boils at over 100 C or a persons blood boiling in outer space It boils there
because the pressure was 0 so low that it boils at your body temp.
( I know not exactly correct but easy to picture)
Third steam turns back into water at 100 C same temp. same temp I know sounds wrong
but its true.
So you have 2 radiators 1 inside 1 out. A compressor that is sucking on the radiator inside
and pushing into the radiator outside. Just before the radiator inside your home there is a
blank with a tiny hole in it so only a small bit of freon can get through. There is a fan on
both radiators. You turn of the compressor the press in the inside radiator goes down
while the outside radiator press goes up. Remember there is that blank only letting a small
amount of freon to flow. the pressure outside goes up while the fan on the radiator keeps
it at outside temp. ( compressing any gas makes it hot. More you compress it the more
the temp goes up) Remember boiling temp goes up when pressure goes up and the boiling
temp is also the temp it condences at. the pressure goes up enough with the temp staying
the same that it turns back into a liquid. It puts out a lot of heat when this happens.
That liquid freon now flows to your inside radiator ( through the small hole in the blank
that maintains the pressure difference) where it now boils at a nice 10 C . The fan
inside blows air over the radiator keeping it warm enough to boil the freon and cooling
your home. The compressor now starts it all over again. A cycle.
sounds complicated but really easy when you go over it a few times.
Sorry for the super long post. Again I love your site just hate this vid.
Tom
Thank you for taking the time to explain, I can't listen to the person in this video. Last month I repaired my totally frosted freezer by adding a 16" long copper wire wrapped around the heating defrost coil. So far the freezer hasn't frosted up again.
Cycles like minecraft
what
Mariux - You can make a system that works in cyles to make materials in minecraft
oh ok
Justin y
she's so beautiful
research the muslim religion
Is this don't crush child's head
She is so hot
I love you brown sugar
Perkins, Perkins, Perkins, why does that name sound familiar? Oh yeah they made engines in the 30s. Sorry different Perkins
Smart and sexy... Wow. It's a bit t9 fast for the average person
Ok calm down there Jimmy