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Aspects regarding the energy efficiency increase in the case of refrigeration systems and heat pumps in Bucharest, Romania.

Author(s) : HERA D., ILIE A., DUMITRESCU R.

Summary

This paper presents a theoretical study of a R-404A heat pump, designed to serve a residential building in Bucharest, by providing hot water for both the heating system and the domestic water system. This phreatic water driven heat pump has a heating capacity of 25 kW. Based on the experimental values provide by this heat pump, operated over the entire cold season 2005/2006, further design work was developed for an extended heating capacity of 118.5 kW demanded by a 24 apartment building consumer. Ecological reasons have brought into consideration ammonia instead of R-404A, first of them being the high total environment warming effect (TEWI) of R-404A. Consequently, a theoretical study was developed for an ammonia compression type heat pump, of the same total heating capacity (25 kW). The first approach showed unusually large vapour discharge temperatures, so the single stage system was replaced by a two-stage compression system. As compared to the R-404A heat pump, both ammonia heat pumps show higher COPs, that is COP1= 4.69, for the single-stage system and COP2= 5.5, for the two-stage system, vs. COP= 3.8.

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Pages: ICR07-E2-390

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Details

  • Original title: Aspects regarding the energy efficiency increase in the case of refrigeration systems and heat pumps in Bucharest, Romania.
  • Record ID : 2008-0386
  • Languages: English
  • Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
  • Publication date: 2007/08/21

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