Basic Calculations of Refrigeration Cycle 

Thanks for this! You saved many Chemical Engineering lives! Appreciate this so much

Thank you so much! Professor doesn't use a projector for a 300 student class. The basic idea is drawn by hand on chalk boards, really didn't help at all. This is so great!!

Very useful and helpful sir. I'm ME student currently taking refrigeration and air conditioning and this is nice to see!

Hi I am sunil chopdekar Civil structural Engineer , done HVAC from SIT mumbai after taken traiing in August 2016, I could understand your explanation nicely on PH graph. Its really helpfull and practical.

Thank you so much my dear Sir I appreciate your help

Big thank for your explanation professor

thanks! very easy to understand

Thanks sir you have explained it very well 😊

Excellent!

Great tutorial. Thank you.

Great video!

Excellent lesson, I just need to so the conversion to SI units, Thanks very much

thanks man

nice microphone/sound quality.

really helpfull for college exam thanks 👍

Thank you sooo much i was so lost

Great video, but I laughed so hard when the green lines fly in along with the sparking sound effect

Thank you for this helpful video .. why do you assume 80 f and 30 psia???

how do you get these temperature and pressure (e.g. 80F, 30 psia) in the first place when you design a refrigeration system?

Nice

what would be the calculation for selection of the compressor with the refrigerant R134a for a refrigeration system of 3TR ?

Merci

will you please give the theoritical calculations for the refrigeration system and also the design of the evaporator which helps for my project.

If I am using R134a as refrigerant and have Q=3kW of heat to remove from the cabin of a car, what is the temperature at state 1 and the pressures at 2 and 3 that I should use (i see you already had them to start with)? My external heat/ambient is 40deg celcius. with this I should be able to follow your example and achieve all the elements of my refrigeration system.

Please Where can I find the playlist of the your complete course (related to Chemical engineering thermodynamics) on the youtube ?

Sir, I have to design an refrigeration chiller for 3 TR cooling , what would be the calculation for selection of the compressor with the refrigerant R134a

Hi, in your worked example you begin with the starting temperature of 85F. What is the reasoning for this temperature? is it a random value? typical value? a value which directly relates to most refrigeration systems? or environmental consideration?

Any chance I could get an explanation why the temperature of R22 doesn't decrease after moving through the evaporator? I was under the impression that it takes the heat from the surrounding air making the air colder to be blown into the car. I may be reading the drawing incorrectly, thank you.

The Qcold is referred to the heat of our home, that is going to be used in the evaporator in order to cool down our home? Am I right? Thinking the evaporator as heat exchanger and trying to identify the cold and heat streams. Then the heat stream is the stream that comes from the home and the cold stream is this that comes from the expansion valve (which is the refrigerant). Am I right? Thank you in advance!

why would you use PSIA as an example of pressure when the R22 system is enclosed and should be psig?

thanks thanks wwooowww u saved 💥

Hi. How do you get Q in kW if you don't have any information given in units of BTU/hr. I was thinking in Q=mass flow*(H2-H1) for example but I can't do that because she don't have Q in BTU/hr for example.

Great video. But I thought the expansion was isenthalpic, not adiabatic?

Is the video ending abruptly? Or is there another part. It just stopped when u were calculating compressor work

Hi Sir I have an query, I have calculated heat exchanger designed capacity by assuming inlet temperatures & found the outlet temperatures of refrigerant (R134a). When i plot those calculated temperatures in the P-h Diagram am getting the different capacity of heat exchanger. Could you suggest how to bring the system equilibrium. Latent heat ratio considerd as 0.75 at Evaporator throughout the calculations & iterations. I tried with changing inlet temperatures from lower limit of refrigerant to higher limit in PH diagram also changed the super heating as well. still am unable to achieve the equilibrium state. Kindly suggest what else could be the other mode of mistakes.

Can an analogous analysis method be applied to transcritical and supercritical cycles?

Sir, The video was really useful and got a lot of new learnings to design my system. Can you help me where I can find the resource to design the Fin and tube evaporator for my experiment. I am searching in and out on the internet but not able to find the theoretical calculation or design consideration for Fin and Tube Evaporator. Kindly help me with this.

The enthalpy on my R22 chart doesn't match yours. Where you see H=32 BTU/lb, I'm at 100 BTU/lb (232 KJ/kg). I can't figure out why I can't come up with the same enthalpy as you. I'm so confused.

hello. why the superheat in your calculate is zero?

Sir we are working on a vapor compression cycle related project and want to find the cooling capacity of the system. We can only measure the temperatures and pressure of the refrigerant (by means of sensors and gauges) for the change in enthalpy. The problem is that we can't measure the mass flow rate as the sensors are really expensive and we are out of budget. Is there a way to find the cooling capacity without the mass flow rate or a way to measure the mass flow rate with only presssure temperature and enthalpy??? Please help this is involves our senior year project in mechanical engineering

video is incomplete sir....plz upload full video (Qhot)

Hello my dear sir, please could you help me in this problem it is not clear 3. Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.1 MPa and -10°C at a rate of 0.12 kg/s, and it leaves at 1.4 MPa and 50°C. The refrigerant is cooled in the condenser to 24°C and 0.65 MPa, and it is throttled to 0.15 MPa. Disregarding any heat transfer and pressure drops in the connecting lines between the components, show the cycle on a T-s diagram with respect to saturation lines, and determine (a) the rate of heat removal from the refrigerated , space and the power input to the compressor, (b) the isentropic efficiency of the compressor, and (c) the COP of the refrigerator. I could not find the enthalpy at state 2 , because there is no values in the given temperature and pressure in the superheated table please help me

Hello sir my name is pratikkumar I'm fresher mechanical engineer. I want to learn everything about block ice plant. I want to make my own 1 ton 150kg block ice machine please guide me.

(to do)

Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.14 MPa and -10°C at a rate of 0.12 kg/s, and it leaves at 0.7 MPa and 50°C. The refrigerant is cooled in the condenser to 24°C and 0.65 MPa, and it is throttled to 0.15 MPa. show the cycle on a T-s diagram with respect to saturation lines, and determine (a) the rate of heat removal from the refrigerated space and the power input to the compressor, (b) the isentropic efficiency of the compressor, and (c) the COP of the refrigerator when i solved the example i said that Q rejected=m(hv@0.15mpa-hafter throttling) and i didn't say (h entering compressor-h after throttling) as we know that it exits from evaporator saturated and enters compressor superheated due to heat transfer in connecting line and pressure drop

Please submit solution for CO2 refrigeration cycle calculation - give COPr value, if Evaporation temperature is - 20 C and condensation is at +40 C Isentropis efficiency of compressor is 0,85. Please calculate mass flow of CO2 and compressor shaft power for cooling duty 100 kW. USE CO2 moller chart can any one solve this problem

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sunitha singh paoul

I am no English

Good. However, bad start. Quick English lesson.......well insulated is quite different from well insulted.