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HSPF calculation of a system allowing switching between a single-stage to a two-stage compression system.

Author(s) : BARBOUCHI S., RITZ J. B., CLODIC D.

Summary

In France, 62% of heating installations in existing single-family dwellings are hydronic systems. A high supply temperature, higher than 65°C, during the coldest days is needed in order to ensure the comfort. An interesting way to reach high temperature by low air temperature with a heat pump is to use a two-stage compression cycle. But, when the weather becomes warmer, the efficiency of a single-stage compression system becomes better than a two-stage compression system. In order to optimise the heating seasonal performance factor (HSPF), a system allowing switching from a single-stage compression system to a two-stage compression system has been studied. The aim of this study is to evaluate the gain of switching from a single-stage to a two-stage compression system and to calculate a HSPF in accordance with a house type and heat network. For that, the input power and the heating capacity of the heat pump have been expressed in relation to outdoor air temperature and water supply temperature at the outlet of the condenser in a single-stage and in a two-stage mode. The system that is studied includes the house, the radiators, and the hydronic circuit. A model describing each component of the heating system has been implemented in a numerical tool, so that it is possible to simulate, in a quasi-static state, the behaviour of the system, and then to evaluate the COP along a heating season.

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Details

  • Original title: HSPF calculation of a system allowing switching between a single-stage to a two-stage compression system.
  • Record ID : 2008-2303
  • Languages: English
  • Source: 2006 Purdue Conferences. 18th International Compressor Engineering Conference at Purdue & 11th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
  • Publication date: 2006/07/17

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