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