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Last update: 13 March 2014 Page 1 of 1

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Subject Name Thermodynamics

Subject Code ECE3153

Title Assignment 6

Name : .... Lecturer : ................................. Intake : ......... Date : ......... 1. A car engine with a power output of 70 kW has a thermal efficiency of 28 percent.

Determine the rate of fuel consumption if the heating value of the fuel is 45,000

kJ/kg.

(10 marks)

2. A household refrigerator with a COP of 1.5 removes heat from a refrigerated space

at a rate of 60 kJ/min. Determine (a) the electric power consumed by the

refrigerator and (b) the rate of heat transfer to the kitchen air.

(10 marks)

3. A heat pump used to heat a house runs about one-third of the time. The house is

losing heat t an average rate of 22,000 kJ/h. If the COP of the heat pump is 3.5,

determine the power of the heat pump draws when running.

(10 marks)

(Total: 30 marks)