How to DESIGN and ANALYSE a refrigeration system

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In this video we take a look at how to design and analyse a HVAC refrigeration. The same method can be applied to a refrigeration, AC or chiller system. We take a look at the properties of refrigerant around the ideal vapour compression cycle. We look at the entropy, enthalpy, pressure and temperature. P1 P2 P3 P4 T1 T2 T3 T4 H1 H2 H3 H4 S1 S2 S3 S4.
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Опубликовано:

19 июн 2024

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Комментарии : 126

@EngineeringMindset 6 лет назад

⚠️ *Found this video super useful?* Buy Paul a coffee to say thanks: ☕ PayPal: www.paypal.me/TheEngineerinMindset

@rophiewilliam2804 4 года назад

I want more information

@shhagley 3 года назад

So much simpler and concise than all the other videos,Kudos Paul

@HeaanLasai 5 лет назад

Thank you for making this video!

@74womack 6 лет назад

So glad I found this channel.Thanks for the great work mate.

@shaukathayat749 6 лет назад

dear uploader, God bless u for helping engineers with such precious videos.

@md.azadhossain6940 6 лет назад

A lot of thanks... we are always with you!

@w5cdt 3 года назад

It’s been 40 years since I took thermodynamics....thanks for the tutorial.

@DanielSanchez-it1ki 3 года назад

Now, THIS is a lovely and very useful video. Great work!

@MuhammadJunaidJD 5 лет назад

thank you bro... this really helped...

@kairodelvis 6 лет назад

Excelentes videos, gracias

@amanofconstantsorrow1040 6 лет назад

Man you are a legend .. thank you

@tusharkumar733 3 года назад

Very useful and in easy way explanation.

@abhinavverma279 6 лет назад

Hey Paul, thanks a lot for all your videos they are very resourceful. Can you please make a video for the safety devices installed in the chiller as it is a necessary devices to save chiller. Thanks.

@Bursadesain 6 лет назад

nice content, Thanks!

@bireshroy4656 9 месяцев назад

the great teacher, best of the best

@johnrichards4877 4 года назад

Really helpful video. What effect would a superheating and subcooling heat exchanger have?

@ercumentinal2311 6 лет назад

Hi Paul. Thank you so much for your videos. I'm learning a lot from your videos because I'm new at "cooling world". Do you want to make a video about "Pump Down Cycle" of a chiller? If you do, I would be grateful to you. Best regards...

@strikerchooo 6 месяцев назад

Great video, thanks! Just a note - if its W or kW it is power, if it is in Jaules - then it is work. Since the evap, condens and compressors are in kW all should be power.

@miken1574 2 года назад

Love this channel and love Paul. Watched several videos on this channel on various topics and learned so much. Starting this series, however, I can't help but notice the way he pronounces the letter "h". It sounds like he's saying "Heych-VAC". So weird, haha.

@agrup69 6 лет назад

Hi! Thanks your sharing your knowledge! Can you tell how can I calculate the amount of refrigerate? Regards!

@VencaZajicek 3 года назад

Thank you for this video. May i ask you? How is possible to calculate dimension (ID and lenght) of capillary tube? ..when I use very stron vent on condenser, how can I calculate its effect on the system?

@EXPLORINGPIPING 6 лет назад

awesome sir

@salehshati1902 3 года назад

thanks for you

@bucurrazvan1316 6 лет назад

Hello , those video are great, i've learn alots of intresthing things. Can u do a video about refrigertant quantity For example : i have a condensing unit X and one evaporator N length of pipes please .

@u2ooberboober 2 года назад

Amazing! I wish to make a static evaporator for a room to produce freezing temps without air movement. How could I use this info to design the custom evaporator while utilizing a premanufactured condensing unit amd known refrigerant?

@billdempsey7477 4 года назад

Ahhh...takes me back to Thermo except presented much better. Well done!

@3gkevh53 2 года назад

You should get into the refrigeration design industry

@elhamasgary791 3 года назад

thanks for your video and useful information . how can we design a refrigeration system according to the heat that we want to rejected from building??

@mzs9262 6 лет назад

hey Paul !! we love you all God bless You and Your TEAM . we are proud of you. .. Dear Paul i want to ask a Question that why we need such kind of calculations ? or after finding all these unknown parameter what will be our next step ???

@michaelmolter6180 3 года назад

I imagine these calculations are more important when designing commercial or industrial scale refrigeration where its not just an off the shelf condensor and evaporator. You'd need to be able to select or size individual components, estimate system performance, and get an idea of cost.

@JaykeSapalaran-iq3qs 3 месяца назад

Great video information ❤, Please make a video tutorial how to read enthalpy diagram

@zaccomusic 3 года назад

good video I hope you keep update :)

@balakrishnabhat9977 5 лет назад

Very well explained. Video is good but sound is low.

@blackburnmichelson6189 2 года назад

hi fried very good explanation. can you calculate comperessor electrical power?

@dhruvrajsinhgohil4892 3 года назад

Do you know how to calculate length of tube required in Evoprator and condenser?

@blackburnmichelson6189 2 года назад

good question

@tshepipowerhouse9004 Год назад

ever got the answer?

@stephendinoboy Год назад

I think it is based on your facilities (how far your evap and condenser areas are). And then you compute the corresponding piping pressure losses to adjust your respectiv capacities.

@user-ht1iz9xh5d 4 года назад

The best video I've seen so far. My question is: For other gas like propane, methane and Neon? Where should I look? Tank you, I will definitely watch your other videos

@EngineeringMindset 4 года назад

Scroll to the bottom of this page for data sheets on all refrigerants theengineeringmindset.com/refrigerant-properties/

@mahmoudkobbara9838 3 года назад

thank u so much for ur efforts but can u please upload how to calculate refregiation system using out and TEC peltier with water cooled system

@movax20h 5 лет назад

Is it possible that the exit of the evaporator (1), is further than saturation line (x=1)? I.e. I understand it would create pressure extra at 1, higher than at 4, but is it possible in practice (with sufficiently thin pipes or something?) I also heard of some systems that operate above the critical pressure, could you cover these systems in separate video?

@movax20h 5 лет назад

Just a minor correction, in your slides and in tables you use, the Enthalpy and Entropy, should be labelled Specific enthalpy and Specific entropy. Sure, it is a sortcut, but still, it is nice to be more .... specific :) Distinction is useful when then anlyzing enthalpy and mass flow and work required. Also thanks god you are using metric units.

@dhruvrajsinhgohil4892 3 года назад

Do you know how to calculate length of tube required in Evoprator and condenser?

@mohdirfan-xy3ny 6 лет назад

hey paul i have watched your all videos thanks for the great knowledge man. can u suggest me any book so that i can understand steb by step about hvac and get more knowledge

@EngineeringMindset 6 лет назад

CIBSE guides are very good, try these

@mohammedegyptian2527 Месяц назад

bravo

@bevarasantoshkumar8636 5 лет назад

Sir, I think according to consumer cooling load we select the evaporator to reject the heat load developed by system, in that video evaporator rejected heat load is around 408kw and compressor needs 85kw(work done on the compressor) to generate the that much capacity, what is refrigeration capacity of that compressor

@neelpunghera2639 4 года назад

Hey man, can we find cooling capacity in kw by enthalpy or entropy?

@troubledsole9104 4 года назад

Paul, I am buying you a coffee after I get paid for my next gig. Thank you so much!

@EngineeringMindset 4 года назад

That would be much appreciated, thank you.

@CoCFFGamer 2 года назад

If we have a cooling load then how do we start the design of the Refrigerator? Also, how to fix the evaporator pressure if we are designing a system to cool at around -70 to -80 degrees celcius? Thank You!!

@jasonhewitt7614 2 года назад

Do you have any videos on capillary tube systems

@saifali2196 28 дней назад

Sir...can you elaborate the how you have taken the pressure for compressor from the manufacturer and along with it mass for the compressor also.

@davidcruz4611 4 года назад

Can you explain why the entropy does not change before and after the compressor. Thanks.

@garyrogers425 5 лет назад

Fantastic video but there seems to be an error. The gas flow rate of 3kg/s is far to high for the picture in the video. Data sheets normally give this as kg/h. So I assume your data sheet said 180kg/h and you only converted to minutes instead of seconds, giving extreme kW values. The compressor looks more like a 1.3kW rather than an 82kW. (i.e. 82/60)

@herambgadgil1185 3 года назад

On what basis have you selected the compressor?

@takiyasamsama 4 года назад

This might be not so smart question, but may I know what chemical modelling is usually used for the saturation table? What I mean, is it Peng-Robinson, or etc.?

@anantagarwal5569 4 года назад

How can the temperature at state 1 and state 4 be the same?(Even in an ideal scenario) The refrigerant after leaving the evaporator will absorb heat and there will be a rise in it's temperature.

@babsy11 3 года назад

Thank you for this useful video, I thoroughly enjoyed watching it. There is a one thing though: on the evaporator load: it's written as m*(h1-h4) but calculated as m*(h1-h3). I presume is the latter. Am I correct?

@olabamijiafeez1071 2 года назад

H3 = H4 isentropic process

@jankracik4635 2 года назад

It is not isentropic. You probably meant isenthalpic, but it is not either of them. In reality, to be more precise it should be said that the enthalpy at 3 is the same as the enthalpy at 4. Between 3 and 4, enthalpy may be slightly varying. Hope it helps.

@jorgeramirez7406 6 лет назад

137/5000 Hello Paul. Your videos are great. I'm just curious to know in which part of the system is located the plate heat exchanger? Thank you.

@EngineeringMindset 6 лет назад

Well a plate heat exchanger is just a compact heat exchanger where two fluids exchange thermal energy. The condenser and evaporator are the two points of heat transfer in the a/c system so you'll often find phx on these parts.

@AngelRodriguez-qg5zq 6 месяцев назад

Thanks Paul! At minute 4:42, what path would you have taken if you had started knowing the cooling load you are looking for?

@rholanddelamerced 5 месяцев назад

Same question here... I am having a difficulty starting at the cooling load. I'm starting to wonder if I am going to use the average COP of ref systems to know the power of the compressor that I would be using.

@FoTeLulz 5 лет назад

Hello, I'm looking to design my own small scale refrigeration system for educational purposes, and was wondering if there is a specific type of compressor recommended? Thanks!

@satibel 3 года назад

I'recommen recycling a compressor from an old fridge/freezer/whatever as it's the cheapest if you want to work at those temps.

@swarupgulalkari866 2 года назад

Please make se video on R290 as propane. As it has no superheated vapour chart.so how to solve it.please help.

@user-lr2og7xp7o 9 месяцев назад

Is there a book that you could recommend?

@sumeetmakwana4800 6 лет назад

Sir, how to Design condenser ?

@Razlazy227 4 года назад

How can I do heat balancing of water cooled condenser? Choice of refregeriant is 134A

@gooddeedsleadto7499 Месяц назад

Line ( dome line) represents saturated liquid or saturated vapor? and everything within the dome is also saturated liquid or saturated vapor? And Left & right of the dome is sub cooled liquid and super heated vapor respectively? Please verify? Thank u

@kdmq 5 лет назад

9:45 *Enthalpy and Temperature

@TritonChannelTV Год назад

Where did you get that 50.9 temp..? Pls explaine

@JohnnyJr396 2 года назад

Can someone help me out with entropy ? What is it and what does it mean when it’s increasing and decreasing in the refrigerant cycle. Thanks

@ranahammad6338 5 месяцев назад

good Boy

@meesreemst9308 2 года назад

If i know how much cooling capacity i need. How do i start this calculation process? Thanks

@ghostridergr8259 2 года назад

i have one dryer air.. works 3 to 40 c temp i change filter and capillary tube but i haft to resize it... so now i have -7.5c entry to evaporator and exit 2.5c after to the accumulator i have - 3.5 and entry to compressor 9c is that normal.... how much must be the Δτ to the evaporator? and with the temp room so the dryer ro works good?? thanks

@niro1722 4 месяца назад

❤❤

@sunil06sit143 Год назад

p=1200 kpa 2nd stage how you have choosed please explain thank you

@ShopperPlug 3 года назад

I want to build a deep freezer from scratch, what kind of expansion valve do I need using your calculation? Like what should I look for in data charts of expansion valve after doing calculations?

@EngineeringMindset 3 года назад

Use coolselector by Danfoss. It'll do it all and the components

@ShopperPlug 3 года назад

@@EngineeringMindset thank you. Is there any other kind of calculator or rule book for generic compressors and expansion valves?

@llupllup 6 лет назад

Hi Paul, i am interested on condenser. I want to know how to calculate cooling capacity in watts or kw on a condenser?

@EngineeringMindset 6 лет назад

Himo Rexhepi it's explained in the video, don't skip through.

@llupllup 6 лет назад

The Engineering Mindset Thank you for replay, i am going to watch again the video. Have a nice day.

@vrichmarketingrenewableene9418 6 лет назад

I want to ask something. I am repairing refrigerators for some time now, but I didn't solve this problem I encounter sometimes. After I recoil the evaporator of the refrigerator, I test the unit and it works fine, the pressure on both sides are normal. after 5-15 minutes the pressure in the low side begins to drop to negative and also in the high side lower to about 120 psi. I turn it off and the pressures take some time to normalize. Sometime, I just change the filter drier to solve the problem, but sometimes the problem continues even I change the filter drier. what causes the pressure to drop?

@ivanilarionov1893 Год назад

Hi, I want to rebuild a 120 L refrigerator into something else. I need to change both the evaporator and condenser with copper pipes that are much more compact. I suppose that with the condenser is easy - I need to measure the length and the diameter of the original condenser and coil another one, just more dense and to compensate the worsened airflow with a fan. But what about the evaporator? The fabric evaporators are aluminum plates with unknown tube diameter and sometimes there are even splits in the line (i don't know for what purpose). And I don't want to cool air, but a volume of water down to 2-4 degrees. Will this change the refrigeration cycle somehow? Thanks!

@lucky-gh5ox 2 года назад

How would be the design of system, but 2 independent evaporator?

@3dprintwiz378 4 года назад

Just wanted to ask, I am using a different table and chart that comes from a book, which has quite different values than yours. When I read the preface, it says the tables and chart are based on a 0 *C where values of hf = 200 kj/kg and Sf = 1 kj/kg K. Is there a correction that I should do to get the same values that you get if I use my book. Thank you.

@jankracik4635 2 года назад

There is no need for correction as you calculate with differences most of the time. It the difference between 2 points that matters.

@carlomabinibayo1284 Год назад

I am using a software called computer aided thermodynamic tables and it shows hf = 200 kj/kg and Sf = 1 kj/kg K same with yours. The table does not match with software for U,H and S.

@MICRO.Elektroteknik 2 года назад

Hello, I want to make 3kw and 3.5 kw evaporators and condensers, but I can't find the formulas. Can you help me please.

@ateaturd 6 лет назад

Where is the Capillary Tube sizing video?

@RahulGawade123 5 лет назад

how to design according to the application? For example I want to design 50 ltr water cooler which cools water from 20 degree Celsius to 10 degree Celsius.

@EngineeringMindset 5 лет назад

reverse the equations

@arturzych138 3 года назад

Question: How do you know the pressure required for the low and high side? Is it just the pressures the compressor can generate and need for the suction side? Also, if that's given or you find out, how do you know the mass needed in your system just use the ideal gas law at that point? Anyone can answer, I'm just curious

@felixstg1 2 года назад

Hi Artur, the system pressure is determined by the type of system you need. The high side pressure is relative to the location of the installation. If you are in Mexico, the high side pressure will be higher than if you are in Canada juste because the high side temperature needs to be higher than the outdoor temperature. The low side pressure is determined with the kind of product you need to refrigerate. If it's a freezer, you need to be lower temperature, therefore lower pressure. To determine the mass of the system, you need the piping size and the density of the fluid at each part of the system. This can be quite the task so we usually apoximate until the installation in complete and the technician can tell you what is the final mass the he put in the system.

@ivanilarionov1893 Год назад

@@felixstg1 Hi, I want to rebuild a 120 L refrigerator into something else. I need to change both the evaporator and condenser with copper pipes that are much more compact. I suppose that with the condenser is easy - I need to measure the length and the diameter of the original condenser and coil another one, just more dense and to compensate the worsened airflow with a fan. But what about the evaporator? The fabric evaporators are aluminum plates with unknown tube diameter and sometimes there are even splits in the line (i don't know for what purpose). And I don't want to cool air, but a volume of water down to 2-4 degrees. Will this change the refrigeration cycle somehow? Thanks!

@sto2779 4 года назад

compressor on the video shows m: 3kg/s and not 7kg/s as you mentioned. I can't find any compressor that show's its mass flow rate specifications.

@kreatordeshmukh4900 6 лет назад

KINDLY UPDATE WITH SCREW,SCROLL & RECIPROCATING AIR COMPRESSOR

@EngineeringMindset 6 лет назад

Here you go! ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-gYcNDT1d30k.html

@IM-br1eb 3 года назад

12:30 How can the temperature at state 4 (refrigerant entering the evaporator) equal temperature at state 1 (refrigerant exiting the evaporator)?

@arturzych138 3 года назад

if something is going through a phase change it's temperature remains the same. As in the evaporator from liquid to vapor. This is also a rough calculation (ideal case)

@superoxidedismutor 5 лет назад

Why so low subcooling? Subcooling is love subcooling is life...

@vivekmohite9219 6 лет назад

how can i design a refrigeration system for 10 degree output temperature and one tr

@EngineeringMindset 6 лет назад

Just reverse the calculations shown and iterate

@mehulkhiloshiya8248 4 года назад

can i get compressor specifications of 1.5 ton for R134a

@EngineeringMindset 4 года назад

Sure watch this ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-gKc1EwO6VeE.html

@akilagayan6533 8 месяцев назад

🇱🇰 thanks

@sevenmaster7820 2 месяца назад

Can i have that excel sheet?

@liveinpeace7653 2 года назад

How to know the amount of mass m

@davidcruz4611 4 года назад

Also please also use US standard units for us yanks. Thanks.

@intellectracoon 5 лет назад

I have a question please, In our country we get ambient temperatures that reach 55 centigrade and the air temperature over the asphalt can reach 60 and inside the car if you increase the fan speed you will not get any cold air in the cabin. We use R134A refrigerant in our ac system. I was wondering if the gas will not condensate at these ambient temperatures.. ? Can you help please. Thanks a lot.

@ysnkhll 4 года назад

Who's here after watching Adam Savage's One Day Builds video? 😂🤷🏼‍♂️

@TritonChannelTV 2 года назад

You say 7 kg/S but you put 3kg/S which is correct? Pls reply

@carlomabinibayo1284 Год назад

I am using a software and it shows hf = 200 kj/kg , hg = 400kj/kg and Sf = 1 kj/kg K , Sg = 1.72 kj/kg. The table that you have does not match with software for U,H and S.

@EngineeringMindset 5 лет назад

⚠️Learn how *REFRIGERANT WORK* here: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-lMqoKLli0Y4.html ⚠️

@honestman276 Год назад

We can make industries but the citizens, politicians and bureaucrats are utterly corrupted in Bangladesh. So I don't dare to make and to run the business on it. Thanks from Bangladesh.

@rizky-ee2nv 4 года назад

your formula for cooling load in evaporator not match with your explanation

@user-ib5rl4ou2i 3 года назад

Please translate in Hindi

@jackmclane1826 Месяц назад

This is a bit too reduced to be useful. Stage 1 is not a saturated vapor. There is something called "superheat". Compressing into stage 2 also adds entropy. Stage 3 is not a saturated liquid at boiling temps. There is something called "subcooling". These simple 4 step diagrams don't cut it.