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which would limit increasing the boiling temperature of the ORC working fluid due to the pinch point. In addition, the size of the system becomes an important design factor in portable energy systems; smaller systems require larger temperature differences to transfer the same amount of heat, and thereby degrade performance. The consequence could be higher entropy generation and exergy destruction, which is described later in the second law analysis. The prototype unit developed in this study was subjected to these design constraints. 2.1. 1st Law Cycle Performance Based on the state points defined in the cycle diagram (Fig. 1), the power cycle conversion efficiency is defined as: * - . / 0 1 2345 ' - ' 6 ' & ( ' ( - 7 6 8 * ( ' - 97:;<=8 >9?@9 ! - 7 6 8 (2.1) (2.2) (2.3) (2.4) (2.5) (2.6) (2.7) (2.8) (2.9) (2.10) The cooling cycle COP is defined as: - 20AB . C 4 @ ' - C7D;<E8 >C4@ ' -' ( "# - 7 6 8 The overall COP of combined cycle is: 2.2. 2nd Law Cycle Performance - * The 1st law performance of the cycle deals with energy conversion quantities of the cycle. It does not evaluate the quality of the energy conversion process. Second law analysis, however, answers this question. The 2nd law efficiency compares the efficiency of the current cycle to the efficiency of an internally reversible one such as Carnot cycle. It provides insight to identify the 6PDF Image | Performance of a Combined Organic Rankine Cycle
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