How does a Refrigerator work?

Have you ever wondered how the refrigerators in your home work? Refrigerators, which have become an integral part of every household, work based on some simple and interesting scientific principles. Beginning with a basic refrigerator model, this video will elaborate on the operation of modern refrigerators, along with the secrets behind their high energy efficiency.
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[@Lesics]

Hi, I hope you liked the video on modern refrigerators. Please visit www.patreon.com/LearnEngineering and support our educational service. Your support will enable us to release 2 videos/month.

[@wobblysauce]

Put a newer motor on an old broken fridge, and the power consumed dropped quite a bit.

[@ronakshah13]

Hi Guys, as always a big fan of you guys... Great video there.... lot more packed in 8 minutes... Just an humble suggestion, a small introduction of compression/expansion effect on temperature (blowing a baloon, or just simply blowing cold air through mouth) would have probably been a perfect start, i guess... Anyways, great effort guys.

[@mech_rk]

how fins increase the rate of heat transfer?

[@noorhaque1090]

Learn Engineering hey. Bro which software u use to make this type off demo?

[@exmuslim3514]

which kind of liquid we are using as a refrigerant?

[@anonymouscamel8031]

I couldn’t sleep because I NEEDED to know how a refrigerator works. Now that I have been enlightened with this knowledge I can finally go to sleep without worrying about anything

[@petchlnwzaaa]

Me too LMAO 😆

[@verbed9053]

LMAO SAME

[@terryparker1633]

Of course if you weren't interested in the material, you were certainly free not to watch. For those seeking some knowledge in this area, very good video

[@ZGlove.]

It's 5: 43 AM where I am, and I just had to know as well.

[@roby_singh]

I was about to sleep, but i decided to search how a refrigerator work. So here I am watching this video before sleeping (Life of an Engineer).

[@Milkinporsche]

The real learning channel, no bs music and introduction.

[@ander1651]

totally agree!

[@skumomcbee1255]

Amen to that!

[@AUSSIETRAINDRIVER]

Like an old school training video!

[@noahkalin1916]

are you dissing kurtzgesagt

[@marclloydugbana]

agree

[@flowersforferdinand375]

If you're wondering WHY the pressure drops when it goes through throttling device, it is due to the Bernoulli effect. A key property of this effect is that as velocity increases, pressure actually decreases (contrary to common expectation). So, as the liquid flows from a large diameter into a smaller one, the flow velocity increases and thus the pressure decreases.

[@ryangodlove3268]

Then how come on like your home air conditioning the high pressure liquid line is smaller than your low pressure evaporator tubes?

[@gelomelo3426]

When the liquid leaves throttle and liquid goes towar evaporator, it's (-20 Celsius), it absorbs heat, so the new temperature has to be increased, ( - 15), because it has absorbed heat, and when the liquid leaves the evaporator in gas phase, it is still (-15), and when you contact liquid phase line (-20 c) and gas phase line (-15 c), how evaporator out put line makes evaporator input line cooler, when is has much more temperature??

[@johnroberts2104]

@@gelomelo3426 Refrigerant in the evaporator does not experience a rise in temperature, only a phase change, which requires energy. That's why it's called the evaporator. The heat absorbed from the air inside the fridge drives a phase change and evaporates the remaining liquid portion of the refrigerant fluid. He says the temperature of the fluid in the capillary tube is brought down significantly because only the very end of the capillary tube has the same temperature as the fluid in the evaporator. At 5:10 you can see the temperature gradient along the capillary tube while it's coiled. That gradient still exists when it's straightened. So if you run the evaporator exit line along the capillary tube, they have the same temperature when they first meet near the evaporator. But as you go farther down, the temperature is higher in the capillary tube. So there is heat exchange between the two lines, and the effect is cooling the capillary tube. Top line is the capillary tube exiting the compressor, bottom line is the evaporator exit line [compressor] ------->(45*C, high pressure liquid)------->(somewhere in between)------->(-20*C, liquid and gas)--->[evaporator]

[@bruhmndm3051]

Thanks! Now it makes a lotta sense

[@gelomelo3426]

@@johnroberts2104 thank you so much . I really appreciate you 🌹💚

[@eejakobowski282]

"This is the most basic refrigerator possible ever" lmao something about the way he says that cracks me up

[@TheyWhomTheGodsDetest]

I got myself a cheap Chinese basic refrigerator off the net. It's been reliable so far, but it's starting to frost up. The narrator said what he said in that tone because he knows the nature of these machines and how that particular one is inferior. Dark Chocolate in moderation is good for your health.

[@Chu3505]

Now a days all refrigerators brands that are around $1000 or under are made in China or in some third world countries.$1000 and up refrigerators brands 90% are made in S. Korea and 10% made here in the United States but likely to be assemblies in Mexico.

[@BMEPRAKULSHARMA]

which software he uses to make these animations

[@kevinlivingston9563]

It's really amazing how much impact refrigeration had on our progress as a society.

[@TheyWhomTheGodsDetest]

We own a 20 year old refrigerator with freezer and a 40 year old freezer. Both of which are either on or off and are very reliable. I like it when I purchase a product and it stands the test of time.

[@hedmeddig]

That is also because back in the day they built things to last. Then they realised that they could make more money if they used cheaper materials. So production is now cheaper, and people buy more when their things break

[@MAYONNAISEMOOSE]

​@@hedmeddigplanned obsolescense. I feel like is a necessary evil

[@delberry8777]

"The throttling device is an obstruction to the flow, so a huge pressure drop occurs..." You should elaborate on this because 1. It is the essence of why it works. 2. The way you say it is counter intuitive. Why would liquid lose pressure when pushed through a smaller space?! The point here is that the same amount of liquid has to pass through a smaller diameter in the same time so the speed at which the liquid passes a given point is higher. According to Bernouilli's principle a fluid/gas that moves faster has lower pressure and vice versa. This is also what makes a plane fly.

[@alep.1818]

Thank you!

[@166senthil]

watch link below: kzbin.info/www/bejne/ravUhYqsbd96oq8

[@legendarynoob6732]

Was looking for this!!!Thanks!!!

[@magica3526]

That's not how planes fly Otherwise planes with flat wings couldn't fly or planes couldn't fly upside down

[@samovarmaker9673]

@@magica3526 it's part of what makes planes fly. The other part is angle of attack.

[@TheRadar758]

Very insightful. I'm an electrician in the Navy and we occasionally work on refrigerators very similar to the one depicted. Thank you for the info.

[@_aullik]

The logical next step would be to make a video about compressors. It would be very awesome if you could also explain what a reciprocating compressor is. Thank you very much for your effort in educating us. I will start supporting you on patreon once i have a job :D

[@Lesics]

Yah, Compressor is a good topic. We will work on it once the current projects are over.

[@CptMikeTango1]

+Learn Engineering Yess, the model is already made so...

[@_aullik]

Its always nice when a YT channel listens to their viewers :D

[@noticemesenpai3125]

I'm with you boi

[@00crashtest]

aullik Piston compressors are outdated technology! They are energy inefficient and noisy. Think of a car engine (pistons) vs electric motor. Most noise and energy loss in a compressor is caused by the piston(s). By removing the piston, it will be much more efficient and quieter. This is why rotary compressors (screw, centrifugal, etc.) are much better.

[@kelvinmahuthu]

perfect breakdown of how the refrigeration cycle occurs.Kudos!!

[@MikeV8652]

This seems fully comprehensible only by physicists or engineers, but I did get a little from it. I just got a new fridge, myself, and I was wondering what had become of all of those coils that used to be on back or underneath. Now I know the answer at least to that. I also know why my new fridge is almost totally quiet.

[@BrunoPOWEEER]

Thaaanks for another FANTASTIC engineering video!!! Can't describe in words how good this channel is!!!! =]

[@MdARahim]

Knowledge knowledge knowledge !!!

[@atomic4440]

K N A W L E D G E

[@umarmars47]

Knowles

[@matejcubela5529]

Same haha

[@_BangDroid_]

No ledge

[@dudes3316]

j

[@Beemgod]

Really needed this. This visual representation aligns perfectly with my learning style. Things are making much more sense

[@antoniocarracedo5486]

Refrigerator lore

[@gri150]

Pog

[@meh92]

this

[@noreaction1]

This narrator sounds like the how it’s made narrator

[@BassheadMusicConnoisseur]

noreaction maybe he is

[@waaa9waaa9waaa9]

Minus the puns.

[@nultari1]

this one is too robotic

[@bodin1912]

You’re right, he does. I wonder if it is the same for the other videos?

[@polymetric2614]

he sounds like an off-brand how it's made narrator

[@m.guedes]

This video was brought to you by Coca-Cola and LG.

[@MixNMatchTube]

😂😂😂😂😍😂

[@MixNMatchTube]

😂😂😂😂😂😂

[@poukeangus9555]

Marcelo Guedes I noticed 😂😂😂

[@anishgautam3121]

Pepsi also...

[@JohnSmith-el5mo]

Oreo too.

[@commongroundelectric5138]

I can't believe I didn't think about this first.

[@Life_of_Matthew]

Always interesting to learn more about how something that I use in my everyday life actually works!

[@DJ1973DZ]

It's really impressive explanation Thank you very much, keep going guys

[@Lesics]

We are glad to know that :)

[@fuadmuhammad2275]

Hi from HVAC-R Engineer, State Polytechnic of Bandung, Indonesia Thanks for making this video, good explanation & animation

[@Lesics]

I am glad to know that.

[@whitesheatingairappliancer7101]

Fuad Muhammad has your school taught you about super heat and sub cool on refrigerator and freezers? I ask this because I do hvac and I have never read anything about it. Thank you Ron White

[@fuadmuhammad2275]

Ron White i have learned it, you may refer to pressure-enthalpy (P-h) diagram.

[@ChrisCo0066]

@@whitesheatingairappliancer7101 I graduated a little over a year ago. We were taught it but I work on commercial refrigeration and cooking equipment and we rarely if ever use it on refrigerators but on walk-ins and ice cream machines and speciality equipment we do.

[@fawadgillani2304]

I really appriciate ur work sir. Wonderful effort to demonstrate tecknical issues to a common man understanding.

[@shouryaarya8445]

Best video on vapor compression cycle. I really appreciate your content. Thank you.

[@nuke123ful]

Wow so much engineering ingenuity in one device, yet we just take it for granted

[@khybermomand4061]

I have found this channel very useful because it provide all information very clearly with no music and introduction. Thank you! That’s all what we want as well as keep it up

[@jwbeaton]

great video! thank you. trying to repair and understand our freezer and this helped a ton.

[@ziljaeyan1203]

even if i know all of these things through studies, im still finding myself binge watching all of your videos on how things work since im intrigued by the animation 10/10 would watch some more haha

[@Ferelmakina]

Shit, man, I felt a substantial leap of quality here. well done guys!

[@BMEPRAKULSHARMA]

which software he uses to make these animations

[@FlameBlueNova]

I knew how a Refrigerator works but I didn't know of the new advancements and improvements they have added. Love these videos!

[@GaneshGanesh-cw6gq]

Iam indian but I don't know proper english but u r animation is so clear

[@Triplex5014]

This is the best explanation of a refrigerator ever! 10/10 👍🏼

[@IncroyablesExperiences]

Great video as usual!

[@howdareyou41]

Keeping glass coke bottles and cans in the freezer is a pretty bad idea though

[@BMEPRAKULSHARMA]

which software he uses to make these animations

[@brian-th4to]

@@BMEPRAKULSHARMA roblox studio

[@venkatarr]

Amazing explanation. Happy to subscribe today.

[@123nicefellow123]

Just came home from work at the fridge factory and watched this video - great stuff!

[@fidxdif]

this knowledge is more important in my life than pythagoras theorem

[@steveexe77]

These are the things men talk about when women are away

[@RushiKesh-qx3cr]

Sigma male 💯

[@harshmangalamverma]

Nowhere you could hey the video like this, I challenge.

[@ashutoshsharma8634]

Truly appreciable. The quality of their video is incomparable.

[@solok4150]

gadndrikstik algorithm

[@archeredutainment8453]

Great learning video on the basic refrigeration cycle. Thank you.

[@andrewyek]

hii, superb good info. and explanation. thanks. do you have a video of explanation such as this that explains the difference between fridge and freezer ? what's the different ? thanks andrew

[@Vishal-Pawar]

Men you are awesome. I m in college even college professor are fail to make understand the concept to students. But you do.

[@nigelbess5168]

he didnt explain how the throttling device decreases the pressure though

[@dibertos]

Bernoulli's principle

[@kilianprietoperal2322]

dibertos whats that and how does it work?

[@dibertos]

In short Bernouilli states that if a liquid is forced through a smaller diameter the speed increases and pressure decreases at the same rate. Also the pressure/speed ratio is stated by Boyle's (gas) law p1.v1 = p2.v2

[@ErShiva]

Oo i think either u have not got right professor or not listened your professor word carefully... Better to go for NPTEL.

[@ivancarbone3566]

This is the most epic video of how refrigeration works out there!!!!

[@jaiprakashudar3272]

The real learning channel , Great video as usual!.

[@programmingingenious]

What is the technology behind keeping some refrigerators Fruits and Vegetables fresh way longer than others?

[@williansouza8724]

always thought that the cold was injected in the stuff we put in the freezer. never thought that actually heat was the one being sucked out.

[@arcfault2873]

As a rule high concentrations of energy always diffuse to lower concentrations. That goes for temperature, pressure, and many other things. So think of it less as cold penetrating the items in your freezer, but the items losing their energy to the less energetic surroundings. Of course all the energy has to go somewhere, which is what the condenser is for, radiating it outside the freezer.

[@JohnGrahamDoe]

you can never 'add cold' so to speak, only gain or lose heat cold is merely the absence of heat, whereas heat is energy

[@RDCTV]

informatve video! thanx a lot!

[@14dandada]

VERY WELL DONE really clear to how it works i will definitely send this to friends who wants to understand my work

[@lol-pk6jj]

00:00 yes that is why i searched for how does a refrigerator work

[@KazeReload]

Clear and fully understandable by every engineer, maybe a bit less by not-of-field people, but still excellent work.

[@christiangibbs8534]

Wow- I've always wondered how these work. Thank you very much!

[@denisborisov4917]

what a great explanation, thank you!

[@kelger6954]

I was literally going to look this up and it showed up in my recommended

[@sab1862]

3:53 That's LG refrigerator! :D

[@fredmamba6368]

simple and straight the point thanks man

[@jaegercrown964]

I never wondered how my refrigerator works? I'm so glad this video was on my recommendation 🤭🤭🤭

[@creativeturbo]

Wow i am happy to see the air compressor is a type of solenoid engine

[@andreymiranda6899]

Yeah!

[@Napoleon_Blownapart]

Ahh thermodynamics. My favorite topic in school

[@solok4150]

Reklopkitrixic syndrome

[@londalecarter3482]

KZbin needs more channels like this

[@thelegendarypro2001]

very clear and easy to understand

[@zeitGGeist]

id love an explanation of Propane fridges! I live off the grid and just found the channel. looking forward to learning lots!

[@moothecow7346]

Damn this beat is dope af! Let me know when yall are thinking of releasing a mix tape

[@mohamadhasanibrahim7234]

so I have a report to submit in 4 days about refrigerators and its functionality, this video just helped me a lot thank you and I can just say this is the best explanation possible great work.

[@harshadahire7835]

absolutely amazing explanation....

[@fadingbeleifs]

I don't think durability was a really really big issue with the older refrigerator is because I've seen hundreds of them that have been running for the last sixty or seventy years without an issue... My great-uncle has a deep freezer that was originally bought in 1947 and has been running like a champ ever since...

[@abdurrahmanmoustapha]

I really miss the old ones ! the modern refrigerators are really bad

[@Boz1211111]

My grandma had refridgerator that is 40 years old but she stopped using it because body panels were rusted.. It was sitting in a wet basement

[@marklangridge2734]

Really interesting video, it did answer many of my questions of refrigeration. It would have been nice if the workings in the compressor where displayed a little more clearly. Having two tubes mysteriously dissapear and a piston pumping hot and cold, whilst I get it, its not as clear as showing the in and out pipes.

[@BarneyBarnett]

Sweet! I thought the metering device was right at the condenser and the coil was spare line coiled up, my tiny 48 litre fridge also runs the high and low pressure lines together for a reason, and now i know what a moisture filter is. Awesome AWESOME video, learn so much inn 8 min

[@yurysharov4499]

Damn that's great content! 20 minutes and I really know how refrigerators work

[@JonGretarB]

The animator might wish do skip storing his soda in the freezer compartment. ;)

[@niccatipay]

I did that before and it barely froze my soda. I felt it for a year there *actually surprised that I left it there for a year* then ice formed and there is a sugar syrup felt up top.

[@thatxonexguy5438]

@@niccatipay u should prolly get a new fridge bro

[@mohamedelabbassi4597]

i was thinking that i can repair my fridg easly until i watched this

[@marutipunjare839]

Love you learn engineering...engineering's never been this easy....

[@saskiavanhoutert3190]

Thanks for such an educational explanation, students perhaps can learn from it.

[@jihongji8452]

one day too late, had my thermodynamics exam yesterday ....

[@Lesics]

Sorry to know that. This video was supposed to release many days back. I tried my level best to include most of the features of a modern refrigerator. That caused the delay.

[@abhimanyum5505]

Learn Engineering How do you guys select the topic for a video?

[@amitjodha9057]

You should do anything but study the subject on the next day of an exam, it burns.

[@big16ification]

Who would agree if I said the Capillary Tube (Valve) is to Gain Preasure..? The Cooling process happen right after the refrigerant exit the High Pressure Capillary tube into Bigger tube (low pressure) The refrigerant change state from liquid to Vapor. This process will Absorb Heat.

[@itsarjun19]

Beautifully explained!!

[@sk-7523]

simply you guys are the best! thank you so much!

[@God-saves2704]

I wanted to know what miracle was keeping my delicious Thrifty's Chocolate Peanut Butter ice cream frozen. I have never enjoyed my ice cream with so much amazement before.

[@ph8632]

Have not been to a Thrifty's store since I was a kid. Are they still in business?

[@injusticeanywherethreatens4810]

Refridgerators with a open back are a great way to give cockroaches a place to hide- my experience shows.

[@Banzybanz]

They like the heat.

[@aintnoloveouthere5340]

You must have hid in refrigerators before

[@orlandogarcia7082]

Great place for roaches to live at a restaurant or fast food place.

[@Moist_yet_Crispy]

What an awesome video! I didn't know that about invertor compressors. I'll now be looking for one for my project!

[@ablekhan325]

For sure I've got something amazing, more than normal understanding, I like it😊

[@ratneshkumarpathak4232]

I have the same refrigerator and I know all of its internals But I never read the manual...😆

[@ibrohimnabiyev5795]

Hi, I am a refrigerator master. I can't create good graphics on a computer. Can I translate this video into Uzbek and post it on my channel? Thanks for the reply.

[@jtr6925]

Thank you for giving fantastic engineering videos

[@fernandotravels]

Great Explanation! Great Video! Keep Up the Good Work! God Bless You

[@alberteinsteinthejew]

I'm still waiting Microsoft to make a fridge

[@johnettipio]

Your wish has come true

[@asvalias]

'Your activation is expired. Please activate the fridge to get access to it'

[@rileymcmead]

Anyone else here because they were bored and staring at their refrigerator?

[@inioluwaisaac2145]

Nah I have an exam

[@dhruvs7390]

Your all videos have whole basic knowledge about topic thanks for your support of increasing my knowledge. ......

[@ronaldquadros750]

Your explanation is superb.I am thankful to you.

[@imjustariceguy]

I l o v e r e f r i g e r a t o r s

[@abdulwahab9798]

Please make video on air conditioning like this.

[@jamesslick4790]

A/C works on the same principle, Just optimized to cool a larger space at a higher temp.

[@Bob_Lob_Law]

Abdul Wahab It's the same thing, just the hot bit goes outside your window.

[@sasikalaperumal1098]

Yeah

[@sasikalaperumal1098]

Nice one

[@Mustafa_Dinc_]

Mükemmel!, çok araştırdım bundan iyisini bulamadım, Teşekkürler

[@shibilipp2011]

Guys I really love this channel. It helps me a lot. Thanks a lot for all those behind the scenes

[@rickyleatherby413]

Try Turkish high CV guy rep

[@nosignal5804]

But how does the throttling device decreases the pressure and hence the temperature?

[@cr-ic3qv]

To understand why the temperature drops read about the joule-thomson effect.

[@nosignal5804]

+chetan raina Thnx for the tip, I just did... Could you tell me if I could put it this way: I see "gas pressure" as how much the gas molecules hit each other and the walls of the container, so when the molecules pass through the throttle not all of them succeed in passing, so we have less molecules on the other side of the throttle, so the pressure decreases on that side because less molecules are hitting each other... And because the pressure drops the temperature drops by charles and boyle's laws. Sorry for deforming physics XD

[@cr-ic3qv]

No Signal yes you're right. This is the reason that the throttle is thinner than the container tube. When the coolant goes from that thin capillary tube to the container with much wider walls it is spreading to a larger area. Increase in area means less pressure because collisions will decrease as area increases.

[@nosignal5804]

+chetan raina Thnx, you're awsome!

[@cr-ic3qv]

No Signal glad to help :)

[@ErnestJay88]

Why the animator put a COCA COLA on a freezer ?

[@Bob_Lob_Law]

Some people just wanna watch the world burn.

[@eliasaquino2152]

Wow. This should be taught in schools. This is applicable!

[@areu8158]

Nice post, thanks for sharing and please keep sharin 👍

[@manfredinotarangelo5525]

Instead of the expansion valve there is the throttling device ("solenoid winding"). How does this device decrease the pressure?

[@northernstar450]

because pressure is directly proportional to temperature according to the formula PV=MRT as pressure rises by being forced through the capillary tube its temperature rises soon after the capillary tube it expands and takes energy from the surroundings cooling it

[@manfredinotarangelo5525]

@@northernstar450 Why does the temperature rise?

[@northernstar450]

@@manfredinotarangelo5525 temperature rises as a consequence of energy input, think of it like you pump up the tire of your bike, at the valve the tube is boiling hot soon after the valve the gas expands and therefore it cools down (just like the white jet streams you see in the sky, after a compression the expansion side is cold in the jet engine that is condensing the little water droplets and you see them as white lines in the sky, in the refrigerator the capillary tube due to internal friction and smaller diametre the gas by compression gets liquefied. at the entrance to the freezer I believe the pipework gets wider and that releases the high pressurized liquid to a low pressure (think of it after a traffic jam the road suddenly widens up to 10 lanes ) so the expansion takes away energy from the surroundings and that causes cooling the surroundings - thats the freezer area of the fridge. in the end by taking the energy from the sorroundings our gorgeous gas becomes liquid (i the black condensor grill behind the frindge and goes back to the compressor, and the cycle continues

[@manfredinotarangelo5525]

@@northernstar450 The decrease in pressure causes a decrease in temperature. this is obvious. the decrease in pressure cannot be guaranteed solely by internal frictions because the tube that connects the gas tank in a high pressure liquid state with the evaporator is very short, therefore the pressure drops will be very small.

[@northernstar450]

@@manfredinotarangelo5525 Possibly ..... apparently on the video they were talking about 2 metres and that for this fridge model is good enough, I believe that CFD and actual testing has led to this solution, in my youth I used to see the usual valve that you spin and to think about it I don;t know how the chill is regulated on a fixed tube system, I believe its more to do with sensors and motor spin

[@Life_n_struggle]

I am doing Polytechnics in Electronics Engineering

[@wirelesskiller9686]

PUKHRAJ suthar....hahhaah .. lol...

[@fuadmuhammad2275]

Where you come from? I'm Fuad from State Polytechnic of Bandung, Indonesia I'm learning HVAC-R

[@Life_n_struggle]

Fuad Muhammad India Rajasthan Jodhpur Government Polytechnics college

[@stcreation7650]

interview chalu hai kya...

[@Banzybanz]

I'm a mechanical engineer. RAC is the only subject that I cleared with grace marks (33/100, 40 needed to pass), lol

[@abhijhala7784]

By far the best explanation🙌

[@muhammadirfan8035]

Thank you so much sir! It was really informative.