Refrigerator working – The Basics

Refrigerator working – The Basics


basic principle of refrigeration is simple just pass a colder liquid continuously around the object which is to be cooled this will take heat out from the object the whole refrigeration technology is after this how to produce cold liquid continuously we will see how this is achieved in this video this is what inside a refrigerator at the heart of the system is a simple device called throttling device cold liquid is produced with help of this phenomenon in this case throttling device is a capillary tube for effective throttling at Inlet refrigerant should be high pressure liquid throttling device is an obstruction to the flow which causes tremendous pressure drop due to drop in pressure boiling point of refrigerant comes down and it starts evaporating heat required for evaporation comes within the refrigerant so it’s temperature drops if you check temperature across throttling device you can notice this drop next phase is simple just pass this cold liquid over the body where you have to absorb heat during heat absorption process refrigerant further evaporates and transforms into pure vapor so we have produced a required refrigeration effect if we can take this low-pressure vapor refrigerant to state before throttling process that is high-pressure liquid state we will be able to repeat this process so first step let’s raise the pressure a compressor is introduced for this purpose compressor will raise the pressure back to its initial value but since it is compressing gas along with pressure temperature will also raise it is unavoidable now the refrigerant is high-pressure vapor to convert it to liquid state we are introducing another heat exchanger this heat exchanger is fitted outside refrigerator so it will liberate heat to the surroundings vapor will get convinced to liquid and temperature will come down to normal level so the refrigerant is back to its initial state again high-pressure liquid we can repeat this cycle over and over for continuous refrigeration this cycle is known as vapour compression cycle you can note more details of refrigerator components here to enhance heat transfer both evaporator and condenser are having fins attached to it since evaporator is cooling the surrounding air it is common that water will get condensed over it forming frost frequent removal of Frost is required to enhance heat transfer apart from raising pressure compressor also helps maintain flow in the refrigerant circuit usually hermetically sealed reciprocating type with proper sealing is used for this purpose since it is compressing gas huge amount of input power is required for this operation a simple energy balance of the system yields this relation performance of a refrigeration system can be defined as follows hope you had a good overview of working of a refrigerator thank you


100 thoughts on “Refrigerator working – The Basics

  1. Ok, I know a little about everything & a lot about nothing. In the tutorial, It's showing the coldest the refrigerant gets is about 20_degrees Celsius. So, I want to know how refrigerant at 20C It's been a while, however, I believe that equals about 68-71 Fahrenheit. How does refrigerant at 70F cool the inside of a fridge along with the items within? Down to 32-40° F (0-4 degrees Celsius)? how does that part work? I know this is a old post. However, a post like this nerver really gets old but too the ones who have aready seen it.

  2. The main counterintuitive headfuckery is how the higher pressure and temperature in one part of a closed system can help cool the system as a whole through thermal equilibrium, heat transfer with the outside, room.

  3. Why is everyone pissed off with the use of articles in the video?? I don't know about you but I really hear him pronouncing them quite well… 🤔

  4. Hello, nice video but a comment I'd like to point out please.

    After the throttling device, the properties of the liquid are -20 °C at 0.6 bar (see 0:58 – 1:30).

    When the liquid goes into the evaporator coils, the contents of the refrigerator (e.g. food) are hotter than the liquid (refrigerant) so the liquid will absorb the heat from the fridge and turn into a vapour. Now the properties of the vapour are T>-20 °C (due to absorbing heat) at 0.6 bar.

    My question arises how is the refrigerant still a vapour at -20 °C at 0.6 bar (see 2:18 – 2:35) when it was a liquid at -20 °C at 0.6 bar (after the throttling device see my second paragraph).

    Shouldn't the temperature of the vapour at the inlet of the compressor be at a temperature greater than -20 °C to exist as a vapour? A more reasonable temperature would have been 5 °C.

    I look forward to hearing back from you.

    Thank you.

  5. To all which are asking themselves what's up with the grammar of the narrator: this is an Indian YouTube channel. They make the script and animations themselves, but they use third-party services for the voiceovers. Some voiceover services use a pay-per-word model. Regular prices are $1 per word, that's why they omit redundant words in their scripts. Less articles (as in grammar) = more keywords for the same money.

  6. Was invented in ancient greece. Europe did not invented in just 300 – 100 years. They had the stolen books of Alexandria which contains all greek inventions.

  7. Pointing out grammatical errors in a video aimed at explaining working of a machine is just stupid. Thank you for the video, it was a great help.

  8. Stop complaining people, the authors first language is clearly not english. But his knowledge is better than yours.

  9. excellent explanation by learn engineering.
    im currently working on some research on district cooling and kind of lost but this video helped me quite a bit

  10. Refrigeration and Air Conditioning: https://www.youtube.com/playlist?list=PLWLbhNQouT–jURo63toJfwFDj5g0c48A

  11. So confused. The guy has a standard American accent, but his script seems to have been translated – and poorly at that. Nice graphics, but impenetrable lecture

  12. He is wrong at 2 min he says low pressure and vapor !!! Wrong!!!!
    then at 2:30 he says the correct high pressure is vapor….
    how can someone lacking such basic knowledge of science ….. make a video and put it out on the web with such incorrect basic science misunderstanding.

  13. Este vídeo me ayudo demasiado , muchas gracias a sus creadores por compartir el conocimiento con los demás. Thank you very much for sharing this videos. It was a really helpful information. Greetings from Medellín, Colombia.

  14. https://www.facebook.com/groups/2176127762449297/?epa=SEARCH_BOX Refrigeration & HVAC group. Please feel free to join 🙂

  15. Sir ye bataaye ki gas kitne saalo tak bina dikat ke chal sakta hai,ya daalna nahi parta agar safely use karte hai

  16. Compressor wouldn't raise the pressure back to initial value it will raise the pressure more than it's initial value so that it will reject the amount of heat it absorbed then use rest of the increased temperature for the latent heat to change its state from vapour back to gas. Thankyou

  17. my question is why using compressor to heat up the element again, why not keep it cool and add something to make it more cool, confusing 🙂

  18. So you saying my bong won't work I made on good my lawnmower gas used to boil now it's cold runs better using less gas to but you learned one know I wrong I but you wished I was wrong then believe it . If think I right watch for backfire I now when hose on bong kinked on mine backfire and head on fire dam sure real hat to jackass . I call it bong for mower . Now I making bong for as air conditioner then find vehicle with carboratore and bong for it weed taught me much after white smoking it anyway bong showed me it but weed why got bong so weed showed me much . Like people ate amazing guess they know much and guessed wrong so you lying cocksucker . Actually that was eye of Horus showed my when enlighten me . Like Tesla he showen much yet tried being just and giving away you morons would not except that you demand Injust and lies why you dumbcunt pricks like half ass liars like church or Trump or news that all bs then people I know always saying I bruatlly honest then don't believe I me you call honesty brutal then lies great what dumbfucks you great ones this justly said and I still me I will pay for mine just like you idiots Will you learned drive me nuts but so do fake ass Americans not even close one I looked few years one in America you idiot whiny unAmerican fake pricks killing America

  19. Still doesn't solve my question of why the low pressure hotter gas (after absorbs heat inside the fridge) must bother, through a two-step process of first increasing and then decreasing pressure/temperature, to become a high pressure liquid rather than just through a simple one-step process to become cold again??? I guess that's the esstenial bit of refrigerator engineering? I agree you sort of explained the chemical thermodynamics.

  20. Nice

    You can visit our YouTube Channel for 3D animated process animation videos. Process Animation shows inherent production processes and manufacturing methodologies which helps normal people understand the concept even better. Our creative designers transform the complex or mundane processes into superbly sculpted 3D models with vivid visualization and presence.

    https://www.youtube.com/watch?v=0o4ZCjHnaRw&list=PLvqBR4ZcnKuPx2nMpDJFyRpRokccteDUw&index=6

  21. what i don't understand:
    1. "an obstruction to flow causes drop in pressure". i would imagine the lack of obstruction to let the liquid expand thus dropping in pressure.
    2. it seems like it starts to boil in the spiral? at ~30 Celsius? (just because of the drop in pressure?) where does the vapor go? because backwards was just the compressor.

    3. why does it come out of the refrigerator as 100% vapor, when normally only at 100 Celsius that can occur. i can understand that cold liquid passing through the refrigerator will heat only a bit producing some small vapor but not 100% since it cannot heat to 100 Celsius

Leave a Reply

Your email address will not be published. Required fields are marked *