1. Anon, National Aircon Catalogue, 2002, in Japanese
2. The second law efficiency of a heat pump system;Akau;Energy,1980
3. Theory of heat transfer—Irreversible refrigeration plants;Bejan;Internat. J. Heat Mass Transfer,1989
4. Optimization of the rate of exergy output of a multistage endoreversible combined refrigeration system;Chen;Exergy,2001
5. Thermodynamic analyses of performance of heat pumps and refrigerators, Part 1: Exergy analysis of COP ratio as a performance index;Nakanishi;Trans. JAR,1993