RECENT DEVELOPMENTS IN COMMERCIAL REFRIGERATION SYSTEMS USING CO2 AS THE REFRIGERANT
The aim of this paper is to present some recent developments in a commercial refrigeration system operating with CO2 as the refrigerant.A real plant, intended to serve a wholesale centre, installed in the late Summer of 2006 year in central Europe, is described.The system includes both low temperature and medium temperature units and it is operated according to a transcritical or subcritical cycle depending on the external air temperature. Electronic expansion valves control the upper cycle pressure both during transcritical and subcritical operations.The low temperature units run a double stage compression and double throttling cycle with removal of the flash gas from the intermediate pressure receiver and inter-stage cooling.The gas coolers have been provided with a water spray system, which assures a significant benefit during summer operations.A rather limited sample of measurements of operational variables is here presented and the data collection is in progress to provide a full account of the system operation throughout the entire year.
M.CHIARELLO E.FORNASIERI S.MINETTO C.ZILIO
Dipartimento di Fisica Tecnica, Università degli Studi di Padova, via Venezia, 1,Padova, I-35131, Italy
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）