Heat Engines, Refrigerators, & Cycles: Crash Course Engineering #11 

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.

She is the perfect host for this. This is the series that keeps be coming back!

Great videos. I'm just getting started "Eng 101" with the terms and theories of Engineering so this is much appreciated.

I lost track of the lessons because I kept looking at that cool shelf in the background. I'm gonna build one of those

The intro to these are so cool!

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.

at this point its essentially Crash Course Thermodynamics :P

Wow, finally understood how it worked. Thanks :)

Thank you for making me smarter.

Thank you so much , you saved me in my school and now in college

i cant wait for the next episode ... fluid momentum! like shockwaves thru substances. Vacuums and compression!

My two loves: dr. Shini and thermodynamics

Glad to know when I get stuck doing the same thing I'm just playing my part in a powerful cycle.

amazing

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.

The best explanation of a heat pump, i finally understood every bit of how it works

Madam thank you so much, you really a good teacher

I lose proper understanding about 3 minutes in most times 😂 but it's still pretty interesting to watch.

I love this series and you Ms Somara :D

I really need this for my semester

Very pretty........... The theory

God I love that series

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 .

Nice IK cameo!

"Lets learn and then repeat" lmao at least I got that down in uni

I love crash course, but can't get past this presenters voice to enjoy the information.

I finally understand "the phase change "

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.

Cool!

dude there was a pickle rick in that pot lol

Cool Story Bro.

Thanks

seemed to gloss over the bit about the expansion valve

"Freon" is to "refrigerant" as "Kleenex" is to "tissue". The brand name became synonymous.

i mastered the repetition of this video

you simplified then my physics professor couldn't in 30 minutes

why does the fluid need to be repressurized in the heat engine?

i am tell one advice that make you life better !

Engineers really care about getting the most efficient work out possible

THANK YOU. We skipped refrigeration in school.

Try to find annoying orange, he’s in there somewhere :3 Also pickle rick

I know that this is a little bit off from engineering but who here would like a crash course criminology

I wished I would have seen the sterling engine on this episode...

You can work and research heat engines, refrigerators and cycles following the career of Mechanical Engineering.

Annoying Orange at 8:01 😂

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.

HELP ME! I DONT GET IT :(

Hah! Bananas in Pyjamas!

Aren't freons banned ? To my knowledge they are banned in the EU but is it just the EU or is this video simplified?

She lives in a gravity free space..... See her background

RICK is inside the POT.

Don't listen to haterz

Shini

She goes about 100 miles an hour. I think 80 miles an hour would be more understandable

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

expansion valve not expansion value

It's just not that there is any kind 6th that I empathize

DEAR JESUS SHE IS GORGEOUS....

? if another Big Bang occurred. Would our universe get scattered and a new space would occupy our place in that 2nd Big Bang universe?

View

Freon? I thought it had been banned.

So posh!

I'm Pickle Rick!

Yesterday. It was avocado day

Second

My fridge runs on cyclopentane. No more CFCs, tyvm

It’s my birthday! I’m turning 13!

first

Did anybody see the annoying orange in the fridge?

Is it me or is the refrigerator cycle having an expansion VALUE?

Justin y

building better refrigerators? what about planned obsolence?!

Cycles like minecraft

Is this don't crush child's head

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

She is so hot

I'm just a child

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

she's so beautiful

Perkins, Perkins, Perkins, why does that name sound familiar? Oh yeah they made engines in the 30s. Sorry different Perkins

I love you brown sugar

Smart and sexy... Wow. It's a bit t9 fast for the average person

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