Energetska efikasnost kombiniranih kompresorsko-ejektorskih rashladnih sistema i toplinskih pumpi
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Apstrakt
A compression enhanced ejector system with utilization of low temperature heat, waste heat, solar energy or geothermal energy is proposed in this paper, as a mechanically efficient way for improvement of the ejector cycle. A combination of mechanical and thermal energies provides a wide range of design alternatives which should yield a competitive refrigeration system. Performance characteristics of the first compressor stage and the second ejector stage are analyzed and optimization of the inter-stage pressure and temperature can be realized according to criteria for maximum mechanical coefficient of performance (COPmech ) and maximum thermal coefficient of performance (COPth ). The influence of the operating conditions: evaporating, condensing, generating and inter-stage temperatures on the combined compressor - ejector refrigeration cycle performances is investigated. High coefficients of performance, thermal COPth from (0.6 – 0.8) up to (1.2 – 1.7) and mechanical COPmech from 8 up to 21, can be obtained with combined compressor – ejector refrigeration system, as an optimal refrigeration system for air conditioning application, suitable for utilization of low temperature heat and competitive with absorption systems.
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Reference
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