7–91 A refrigerator is to remove heat from the cooled space at a rate of 300 kJ/min to maintain its temperature at 28°C. If the air surrounding the refrigerator is at 25°C, determine the minimum power input required for this refrigerator. 0.623 kW

minimum power input required for this refrigerator is 0.623 kW

Explanation:

given data

rate = 300 kJ/min

maintain temperature T1 = -8°C = 265 K

air surrounding the refrigerator T2 = 25°C = 298 K

solution

we get here first COP that is

COP =    

COP =  =  8.03

and we know here

COP =  

8.03 =  

W = 0.623 kW  

the warning light flashes for a second or two when the engine starts. if it stays on, there's must be something wrong with the coolant. you should never dare to continue driving when the light is on. pull over as soon as possible and shut the engine off.

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