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CO2 Vapor Compression Systems

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CO2 Vapor Compression Systems ( co2-vapor-compression-systems )

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158 M.-H. Kim et al. / Progress in Energy and Combustion Science 30 (2004) 119–174 Fig. 51. Residential CO2 system controls of capacity and efficiency. (a) Heat pump, (b) air-conditioning. the need for supplemental heat (Fig. 51), which illustrates the CO2 system’s ability to select a compressor discharge pressure that gives it extra capacity or efficiency when needed. These results helped establish priorities for subsequent analyses of the effects of CO2’s transport properties on heat exchanger temperature differences, and ways to optimize the geometry of the next generation of reversible heat exchangers for transcritical CO2 heat pump systems. To complement the experimental comparisons of competing systems, a parallel analytical effort was undertaken to develop a relatively simple simulation model that could analyze many of the essential differences between transcritical and subcritical systems [153].

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