PERFORMANCE EVALUATION OF 2-STAGE CO2 HEAT PUMP CYCLE HEAT GENERATOR
Because of its low critical temperature, carbon dioxide refrigerant is especially suitable for heat pump cycle with high heat rejecting temperature, such as water heater or central heating boiler. We have been developing residential CO2 heat pump space heating system for cold regions. However, the water temperature returned from the panel radiators is not so low. So, a simple CO2 heat pump can’t achieve enough heating capacity and high COP at low ambient temperature. In the 2-stage heat pump cycle (gas injection cycle using 2-stage compressor), both the heating capacity and the COP are much improved compared with simple cycle, with high water temperature and at low ambient temperature. We measured the heating capacity and the COP of the heat pump heat generator unit.Conclusions: the 2-stage heat pump cycle improves heating capacity by 50％, COP by 22％, at ambient temperature -20℃. And also it improves the annual average COP by 11％, considering the climate condition in cold region in Japan. It is possible that a compact and efficient CO2 heat pump heat generator replace conventional boiler and reduce residential energy consumption in cold region.
Osamu KUWABARA Masahiro KOBAYASHI Hiroshi MUKAIYAMA Mitsuhiro ISHIKAWA Minoru YAMADA
SANYO Electric Co., Ltd., 1-1-1 Sakata, Oizumi-machi, Ora-gun, Gunma, 370-0596, Japan Hokkaido Electric Power Co., Inc., 2-1 Tsuishikari, Ebetsu Hokkaido, 067-0033, Japan
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）