期刊
INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID
卷 28, 期 8, 页码 1238-1249出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrefrig.2005.08.009
关键词
refrigeration; compression system; CO2; transcritical system; calculation; high pression; optimization; correlation
The system performance of a CO2 refrigeration system is greatly affected by the compressor discharge pressure. An internal heat exchanger (IHX) with high effectiveness is an important factor to achieve high system performance. The expression traditionally used to describe the heat exchange effectiveness is not suitable for CO2 systems. As a result a practical effectiveness expression for IHX, based on enthalpy difference, has been derived and is reported in this paper. Detailed analysis on the relationship between the optimum high pressure P-k,P-opt and other systematic parameters was performed. Evaporating temperature has little influence on P-k,P-opt,; and IHX can minimize the sensitivity of the system to the refrigerant quality x at the evaporator outlet. Based on simulation data, a correlation of P-k,P-opt was developed that predicts the simulation values with a deviation of less than 3.6% in the whole range and 0.94% when the evaporating temperature t(1) = 5.3 degrees C. The results reported in this paper can be used in optimum control and performance evaluation of the whole system. (C) 2005 Elsevier Ltd and IIR. All rights reserved.
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