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Experimental performance analysis and optimization of a direct expansion solar-assisted heat pump water heater

Author

Listed:
  • Li, Y.W.
  • Wang, R.Z.
  • Wu, J.Y.
  • Xu, Y.X.

Abstract

In this study, a direct expansion solar-assisted heat pump water heater (DX-SAHPWH) with rated input power 750W was tested and analyzed. Through experimental research in spring and thermodynamics analysis about the system performance, some suggestions for the system optimization are proposed. Then, a small-type DX-SAHPWH with rated input power 400W was built, tested and analyzed. Through exergy analysis for each component of DX-SAHPWH (A) and (B), it can be seen that the highest exergy loss occurs in the compressor and collector/evaporator, followed by the condenser and expansion valve, respectively. Furthermore, some methods are suggested to improve the performance of each component, especially the collector/evaporator. A methodology for the design optimization of the collector/evaporator was introduced and applied. In order to maintain a proper matching between the heat pumping capacity of the compressor and the evaporative capacity of the collector/evaporator under widely varying ambient conditions, the electronic expansion valve and variable frequency compressor are suggested to be utilized for the DX-SAHPWH.

Suggested Citation

  • Li, Y.W. & Wang, R.Z. & Wu, J.Y. & Xu, Y.X., 2007. "Experimental performance analysis and optimization of a direct expansion solar-assisted heat pump water heater," Energy, Elsevier, vol. 32(8), pages 1361-1374.
    • Handle: RePEc:eee:energy:v:32:y:2007:i:8:p:1361-1374
    DOI: 10.1016/j.energy.2006.11.003
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    References listed on IDEAS

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    1. Huang, B.J. & Chyng, J.P., 1999. "Integral-type solar-assisted heat pump water heater," Renewable Energy, Elsevier, vol. 16(1), pages 731-734.
    2. Torres R, E & Picon Nuñez, M & Cervantes de G, J, 1998. "Exergy analysis and optimization of a solar-assisted heat pump," Energy, Elsevier, vol. 23(4), pages 337-344.
    3. Aziz, W. & Chaturvedi, S.K. & Kheireddine, A., 1999. "Thermodynamic analysis of two-component, two-phase flow in solar collectors with application to a direct-expansion solar-assisted heat pump," Energy, Elsevier, vol. 24(3), pages 247-259.
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