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TECHNICAL REPORTS (4) Powerrecoveryexpander References: Since the expansion enthalpy drop in CO2 circuits is much larger than that of an HFC refrigerant, recovery and reuse of expansion power are effective, resulting in improved efficiency. Power recovery expanders with the same basic structure as a compressor are being developed at present. To improve efficiency, special attention is being paid to the reduction of internal leakage loss and friction loss. 5. Conclusion This paper outlined Mitsubishi’s current R&D activi- ties related to technologies for natural refrigerant air-conditioners. Mitsubishi will improve the efficiency and reliability of products equipped with the technolo- gies discussed above. (1) DIRECTIVE 2006/40/EC OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL (2006). (2) T. Okada: CO2 Refrigerant Heat Pump Water Heater “ECO CUTE”, Mitsubishi Technical Report, 81, No.3, pp. 185-188, 2007. (3) H. Maeyama et al.: “Development of a Compressor for CO2 Heat Pump with a Single Rotary Mecha- nism,” International Compressor Engineering Con- ference at Purdue (2006), C056. (4) H. Maeyama: Development of a Compressor for CO2 Heat Pump Water Heater with a Single Rotary Mechanism, The International Symposium on New Refrigerants and Environmental Technology 2006, pp. 217-222. (5) H. Maeyama: Rotary Compressor for CO2 Heat Pump Water Heaters, Mitsubishi Technical Report, 81, No. 3, pp. 189-192, 2007. Mitsubishi Electric ADVANCE December 2007 5PDF Image | Heat Pump with Natural Refrigerants 3041
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