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The performance of irreversible combined heat-pump cycles

The effects of thermal resistances and internal irreversibilities on the performance of combined heat-pump cycles (combined vapour compression - vapour compression heat pumping and combined vapour compression - absorption heat pumping) were investigated using a finite-time thermodynamic approach. Improved equations for the coefficient of performance of the systems under consideration were obtained. It was found that combined vapour compression heat pumping is more effective than combined vapour compression - absorption heat pumping for the same heating load regardless of its energy consumption being greater.