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Theoretical model and experimental validation of a direct-expansion solar assisted heat pump for domestic hot water applications

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  • Moreno-Rodríguez, A.
  • González-Gil, A.
  • Izquierdo, M.
  • Garcia-Hernando, N.

Abstract

This paper has shown the development of a theoretical model to determine the operating parameters and consumption of a domestic hot water (DHW) installation, which uses a direct-expansion solar assisted heat pump (DXSAHP) with refrigerant R-134a, a compressor with a rated capacity of 1.1kW and collectors with a total area of 5.6m2. The model results have been compared and validated the experimental results obtained with the equipment installed at the University Carlos III, South of Madrid. The analysis was conducted over the course of a year, and the results have been represented depending on the meteorological and process variables of several representative days. Taking into account the thermal losses of the installation and the dependency on the operating conditions, the acquired experimental coefficient of performance is between 1.7 and 2.9, while the DHW tank temperature over the course of the study is 51°C.

Suggested Citation

  • Moreno-Rodríguez, A. & González-Gil, A. & Izquierdo, M. & Garcia-Hernando, N., 2012. "Theoretical model and experimental validation of a direct-expansion solar assisted heat pump for domestic hot water applications," Energy, Elsevier, vol. 45(1), pages 704-715.
    • Handle: RePEc:eee:energy:v:45:y:2012:i:1:p:704-715
    DOI: 10.1016/j.energy.2012.07.021
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    References listed on IDEAS

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    1. Kong, X.Q. & Zhang, D. & Li, Y. & Yang, Q.M., 2011. "Thermal performance analysis of a direct-expansion solar-assisted heat pump water heater," Energy, Elsevier, vol. 36(12), pages 6830-6838.
    2. 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.
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