Evaluation of a Double-Stage Coupled Heat Pump for Heating: Performance Optimization and Case Study
Publication: Journal of Energy Engineering
Volume 139, Issue 3
Abstract
A thermoeconomic model for a double-stage coupled heat pump (DSCHP) with finite-rate heat transfer, heat leakage, and internal irreversibility has been developed. The heating load per unit total cost has been taken as the objective function. The optimal performance characteristics of the DSCHP have been discussed in detail and the optimum design parameters have been deduced analytically. The theoretical model has been exemplified in a particular case study. The investigation results demonstrate that the model is accurate to within 15% of the experimental data. The DCSHP design, with thermoeconomic optimization, leads to a significant increase of the specific heating load and a clear improvement of the economic performance with a small decrease of the coefficient of performance. When the values of ambient temperature, irreversibility of cycle I, irreversibility of cycle II, and investment cost per unit power have the same variation (5%), the objective function changes about 5, 5, 4.4, and 4.5%, respectively. The present paper provides a theoretical basis for design, thermoeconomic performance evaluation, and improvements of the DSCHP system.
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Acknowledgments
The work described in this paper was financially supported by both the Fundamental Research Funds for the Central Universities (11MG45) and the Beijing Natural Science Foundation (3122028). In addition, the writers thank the anonymous reviewers for their valuable comments on this paper.
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Information & Authors
Information
Published In
Journal of Energy Engineering
Volume 139 • Issue 3 • September 2013
Pages: 198 - 206
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Feb 26, 2012
Accepted: Jan 2, 2013
Published online: Jan 4, 2013
Discussion open until: Jun 4, 2013
Published in print: Sep 1, 2013
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