ASPECTS REGARDING THE ENERGY EFFICIENCYS INCREASE IN THE CASE OF REFRIGERATION SYSTEMS AND HEATING PUPMS IN BUCHAREST-ROMANIA
This paper presents a theoretical study of a R404A 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 25kW. 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 xtended heating capacity of 118,5kW 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 (25kW). 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 R404A 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.
energy efficiency district heating system Heat Pump-Refrigeration System.
D.Hera A.Ilie R.Dumitrescu
Technical University of Civil Engineering 66, Pache Protopopescu Bd. Bucharest 2, Zip code: 021414,R Technical University of Civil Engineering 66, Pache Protopopescu Bd. Bucharest 2, Zip code: 021414,
国际会议
The 22nd International Congress of Refrigeration(第22届国际制冷大会)
北京
英文
2007-08-21（万方平台首次上网日期，不代表论文的发表时间）