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
Fig 4 Variations of optimum COP of refrigerator wrt k
Fig 5 Variations of optimum COP of heat pump w.r.t k
4. CONCLUSION
The thermo economic performance analysis of work consuming devices coupled to variable temperature heat
reservoir has been presented for more realistic optimization and design considerations. The objective functions,
taken as the heating power per unit total cost for the heat pumps and cooling power per unit total cost for the
refrigerators is optimized with respect to the working fluid temperatures and the values of various parameters at
optimal operating conditions are calculated. The maximum objective function and the corresponding optimum
COP have been determined in terms of economic parameters. The results are compared with those obtained for a
system with fixed temperature heat reservoirs. The optimal value of COP for a typical set of operating conditions
at which the objective function attains its maximum value has been found to appear at lower value when
compared with systems coupled with infinite capacity heat reservoir. It is concluded that the optimized results for
systems with finite capacity heat reservoir will provide more realistic standard for the performance and economic
design conditions.
33