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Do you know the calculation method of the refrigeration capacity of the refrigerator?

Update:13-12-2021
Summary:

Refrigerators are widely used in refrigeration systems. […]

Refrigerators are widely used in refrigeration systems. How to calculate the refrigeration capacity of the freezer? The method is as follows:
  According to chemical thermodynamics, work is converted into heat (refrigerator), and its efficiency depends on the temperature difference between the cold and hot ends of the refrigerator
  N=q/p=t/(T-t)
  N= cooling coefficient q= cooling capacity of the refrigerator p= input power (equal to power consumption multiplied by motor efficiency)
  T=The cold end temperature of the refrigerator (absolute temperature unit "open" K)
  T=The temperature of the hot end of the refrigerator (absolute temperature unit "K")
  A freezer knows that its motor is 3KV 750KW
  How to calculate the amount of refrigeration, and are there any parameters needed?
   First, use a thermometer to measure the normal working time
  1: The temperature of the radiator of the refrigerator T=? Celsius +273=(?+273) Kelvin temperature, assuming T=80 degrees Celsius=273+80=353K
  2: The refrigerator temperature t=? Celsius +273=(?+273) Kelvin temperature assuming t=-30 degrees Celsius=273-30=245K
   Calculate the coefficient of refrigeration n based on the play formula:
   Refrigeration coefficient n=t/(T-t)=245/(353-245)=2.272
   Now you still need to look at the watt-hour meter and record the hourly power consumption p, suppose it is p=500 kWh=500x3600/4.18=430622 kcal
  Then the amount of cooling (or heating) of this refrigerator per hour q=np=2.272x430622=978373 (kcal)
  Considering that the mechanical and electrical efficiency of the freezer is 0.9, in fact, the hourly cooling (or heating) capacity of this freezer is 978373x0.9=880536 kcal

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