Problem 19.39 Part A A heat pump extracts energy from groundwater at 10 C and tr

Question

Problem 19.39 Part A A heat pump extracts energy from groundwater at 10 C and transfers it to water at 60 to heat a building. Find its COP Express your answer using two significant figures. COP- Submit My Answers Glve Up Part B Find its electric power consumption if it supplies heat at the rate of 20 k W Express your answer using two significant figures kW Submit My Answers Give Up Part C Find the hourty operating cost of the pump if electricity costs 15.5 /kWh Express your answer using two significant figures. dollars Submit My Answers Give Up

Explanation / Answer

COP= T(cold)/(T(hot)-T(cold))

=(10+273)/((60+273)-(10+273)) = 5.66

b

COR = rate of heat supplied/ power consumed

Power consumed = rate of heat supplied/ COR

=20/5.66

=3.53 kW

c

hourly operating cost of the pump

p= 3.53* 15.5

= 54.76

d

hourly cost of operating of oil furnance

p= (3.53*2.6)/30

= 0.35 dollars

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