Assignment On Kelvin Statement

Running head: MAE 204 Fall 2019 HW #7
MAE 204 Fall 2019 HW #7
Name of the Student
Name of the University
Author Note

MAE 204 Fall 2019 HW #71
Problem 1:
a) Given that, the total heat input of a heat engine = 2 KJ
The thermal efficiency of the engine = 40%
Hence, the amount of work produced by the engine = 2*40/100 = 0.8 KJ.
Hence, the amount of the heat rejected by the engine assuming there are no other losses = 2-
0.8 = 1.2 KJ.
b) Given, the air-conditioner removes the heat at the rate of 1 kW.
Hence, refrigeration rate ( ̇QL) = 1 kW
Also, given the power consumed by the air-conditioner or the power input (W net ,∈¿¿) = 0.7
kW
Hence, by assuming the air-conditioner works steadily the coefficient of performance (
CO PR ¿ is given by,
CO PR = ̇QL
W net ,∈¿ ¿ = 1/0.7 = 1.429