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Comparison of the conventional and economised vapour injection refrigeration cycles utilising variable speed capacity control for domestic heat pump retrofit applications.

Number: pap. ID: 266

Author(s) : QUINN M. V., HEWITT N. J., SMYTH M.

Summary

Global drivers such as climate change, fuel security and rising fossil fuel costs have resulted in the need for increased energy efficiency and reduced overall energy consumption. The conventional reversed Rankine cycle (CRRC) is a proven technology in terms of providing high efficiency heat transfer from a low temperature source to a high temperature sink. Its efficiency however is highly dependent on the experienced operating conditions; the temperature and pressure lift from the evaporator to condenser. The domestic air to water heat pump retrofit application extends these conditions, requiring higher output water temperatures to utilise existing heat distribution systems and operating at a range of air temperatures as dictated by the seasons. This work aims to improve the performance of the conventional cycle, utilising the economised vapour injection cycle (EVI) and employ a variable speed drive to match heat capacity with household heating demand. The results show that the improvements in heating capacity and COP achievable with the EVI system increase with reducing ambient temperatures and reducing refrigerant mass flow rate. Maximum improvements in heating capacity and COP of over 40 and 25% respectively, are achievable depending on operating conditions.

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Details

  • Original title: Comparison of the conventional and economised vapour injection refrigeration cycles utilising variable speed capacity control for domestic heat pump retrofit applications.
  • Record ID : 30002387
  • Languages: English
  • Source: Proceedings of the 23rd IIR International Congress of Refrigeration: Prague, Czech Republic, August 21-26, 2011. Overarching theme: Refrigeration for Sustainable Development.
  • Publication date: 2011/08/21

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