A refrigerator works between 4°C and 30°C. It is required

A refrigerator works between 4°C and 30°C. It is required to remove 600 calories of heat every second in order to keep the temperature of the refrigerated space constant. The power required is :(Take 1 cal = 4.2 joules)

Coefficient of performance of a refrigerator, β =	Q₂	=	T₂
	W		T₁ - T₂

(Where Q₂ is heat removed)
Given : T₂ = 4°C = 4 + 273 = 277 k
T₁ = 30°C = 30 + 273 = 303 k

β =	600 × 4.2	=	277
	W		303 - 277

⇒ W = 236.5 joule

Power , P =	W	=	236.5 joule	= 236.5 watt
	t		1 sec