OCTOBER 19-20, 2012 - YMCA University of Science & Technology

Proceedings of the National Conference on
Trends and Advances in Mechanical Engineering,
YMCA University of Science & Technology, Faridabad, Haryana, Oct 19-20, 2012
k appears at lower a value for the system with finite temperature heat reservoir. The reduced global and optimal
performance with respect to systems with fixed temperature reservoir will correspondingly affect the
performance and design criterion.
3.5
3
2.5
bFref
2
1.5
1
0.5
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0
COPref
kv = 0.4 kf = 0.4 kv = 0.1 kf = 0.1
Fig 2 Variation of objective function for the endoreversible refrigerator wrt COP for various values of k
Fig 3 Variation of objective function for the endoreversible heat pump wrt COP for various values of k
The variation of the optimum COP for the refrigerators and heat pumps with respect to economic parameter (k),
corresponding to both variable and fixed temperature heat reservoir, respectively, are shown in Fig 4 and Fig 5. It
displays, in all cases, an increase in optimal performance coefficients as k decreases. At k = 0, COP =
(COP)carnot, but in real applications, k is always greater than zero and its value is determined by the economic
conditions of a country.
32