CO2 CYCLE BASED ON COMPRESSION COOLING
If direct greenhouse gases emissions are negligible with carbon dioxide as refrigerant, indirect emissions linked to overall system efficiency have to be as low as possible to be competitive with hydrofluorocarbons. Despite attractive thermophysical properties, thermodynamical efficiency is quiet poor due to supercritical gas cooling. To achieve high performances, we propose a new cycle based on isothermal compression. We have explored different ways to get a near isothermal compression: external wall chamber cooling, internal atomised oil injection and finally multistage compression have been investigated. It appears that external cooling has nearly no effect for reciprocating compressors while oil injection allows increasing the overall efficiency by 30％ depending on injection rate. Multistage intercooler compression is promising for large cooling rate, as the coefficient of performance enhances by 38％ when using five compression stages. However, all initiatives combinations to cool carbon dioxide during compression have to be considered.
C.TOUBLANC M.CLAUSSE M.F.TERRIER F.MEUNIER
Laboratoire du froid (E.A. 21) – C.N.A.M. - I.F.F.I., 292 rue Saint-Martin,75141 Paris Cedex 03, France
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）