CARBON DIOXIDE AS A REFRIGERANT IN A SLUDGE DRYING HEAT PUMP
Carbon dioxide (CO2) heat pump system for sewage sludge drying can be an energy efficient alternative for the traditional methods, that also avoids emissions from the drying installation. In this system sludge is dried by closed loop circulating air, treated in the heat pump. Due to the critical parameters of CO2 (Tc = 304,13 K and pc = 7,38 MPa) the process in the CO2 heat pump is the transcritical cycle with high compressor discharge temperature. It provides additional hygienization of dried product which becomes sanitary safe and environmentally sound.The paper presents data from laboratory measurements of sludge drying in controlled temperature and humidity environment and energetic evaluation and optimization of the working parameters of the transcritical CO2 heat pump. Impact of the internal heat exchanger (SGHX) and gas cooler pressure on energy efficiency of the heat pump and the whole drying system have also been analyzed.
A.FLAGA J.SCHNOTALE
Cracow University of Technology, Institute of Heat Engineering and Air Protection 24 Warszawska Str., Krakow, 31-155, Poland
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）