COP IMPROVEMENT BY TRANSFER OF THE SUPERHEATING INTO THE INTERNAL HEAT EXCHANGER
It is well known, that the power consumption of refrigerators is reduced by about 2-3 ％, when the evaporation temperature is increased by 1 K. It is proposed to obtain such an increase of the evaporation temperature by a combination of an internal heat exchanger in combination with a thermostatic expansion valve. With this combination it is possible to realize a slightly wet outlet of the low pressure stream out of the evaporator and to transfer the final evaporation and the superheating into the internal heat exchanger. To facilitate a stable control behaviour it is proposed to operate the internal heat exchanger in the co-current mode. The result of this arrangement is a power saving in the 5 to 10％ range and a similar increase of the volumetric refrigeration rate. A further increase is possible, if the surface area of the evaporator is increased.This arrangement is advantageous for all refrigerants, even for ammonia, where normally internal heat exchangers are detrimental.
A.TAMBOVTSEV H.QUACK
Technische Universit?t Dresden, D-01062,Dresden, Germany
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）