How does a Refrigerator work? 

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

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.

how fins increase the rate of heat transfer?

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

which kind of liquid we are using as a refrigerant?

totally agree!

Amen to that!

Like an old school training video!

are you dissing kurtzgesagt

agree

Me too LMAO 😆

LMAO SAME

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

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

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).

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

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??

@@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]

Thanks! Now it makes a lotta sense

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

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.

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.

which software he uses to make these animations

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

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

@@MAYONNAISEMOOSE Yes and no because it promotes change which can be positive but it also creates more waste and costs more to the consumer.

Thank you!

watch link below: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-wzqTWv8zGlM.html

Was looking for this!!!Thanks!!!

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

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

K N A W L E D G E

Knowles

Same haha

No ledge

j

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

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

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

I'm with you boi

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.

noreaction maybe he is

Minus the puns.

this one is too robotic

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

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

which software he uses to make these animations

I am glad to know that.

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

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

@@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.

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

which software he uses to make these animations

@@BMEPRAKULSHARMA roblox studio

Pog

this

We are glad to know that :)

😂😂😂😂😍😂

😂😂😂😂😂😂

Marcelo Guedes I noticed 😂😂😂

Pepsi also...

Oreo too.

gadndrikstik algorithm

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.

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

he didnt explain how the throttling device decreases the pressure though

Bernoulli's principle

dibertos whats that and how does it work?

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

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

Yeah!

Reklopkitrixic syndrome

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

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

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.

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

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

They like the heat.

You must have hid in refrigerators before

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

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

Sigma male 💯

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.

@@niccatipay u should prolly get a new fridge bro

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

+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

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.

+chetan raina Thnx, you're awsome!

No Signal glad to help :)

Your wish has come true

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

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

@@northernstar450 Why does the temperature rise?

@@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

@@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.

@@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