STATE-OF-THE-ART FOR COOLING WITH WATER AS REFRIGERANT (R 718)
Water R 718 is the perfect refrigerant for water chillers and machines producing liquid, pumpable ice (binary ice). Water is safe, cheap, is not subject to pressure codes and does not harm the environment. Direct contact heat exchangers contribute to the good COP. However, the enormous volumetric water vapour flow in association with a high pressure ratio poses particular requirements with respect to the design of the compressor.Radial water vapour compressors are relatively simple to develop and build. However, such compressors have shown problems with the mechanical design and materials, furthermore they suffer heavily from liquid entering the compressor and last but not least the dimensions of chillers or ice machines working with water as refrigerant are huge.Axial water vapour compressors are robust, small and efficient. The development is much more difficult and very expensive, however. In return such compressors are insensitive to liquid entering the compressor, have excellent part load control properties and can even be built oil-free with water as the lubricant.
J.Paul
DTU-Technical University of Denmark Department of Mechanical Engineering (MEK) Nils Koppels Allé 402, 2800 Lyngby, Denmark
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）