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sources of irreversibility, or the so called exergy destruction, which can help improve the overall cycle efficiency. In addition, it provides a fair comparison of efficiency between different cycles operating at different conditions. The source of exergy destruction is attributable to entropy generation during a process such as heat transfer across finite temperature difference, and unconstrained expansion and compression. In addition, friction between surfaces and fluid pressure drop will also contribute to entropy generation inside each themo-mechanical processes. Higher entropy generation for a particular process will lead to more exergy destruction, and thus lower 2nd law efficiency. By assuming each major component inside the combined cycle as a control volume and conducting the exergy balance around it, the exergy destruction rate based on steady state condition can be determined. After combining the exergy destruction rate in each component, the total exergy destruction rates of the cycle can be determined as follows: Exergy destruction in Power cycle: Exergy destruction in cooling cycle: Exergy destruction in combined cycle: - $7 F<G J K<L 8 H45I,BA0 HB5M,BA0 - $7D<=N J ==<E 8 HB5M,BA0 HM44@,BA0 - J (2.11) (2.12) (2.13) According to Eqs. (2.11) and (2.12), the higher the average oil heating temperature and the lower the average outdoor cooling air temperature, the higher the exergy destruction in the power cycle. This is because the temperature differences inside the boiler and power condenser are higher for given fluid boiling and condensing temperatures, which generates more entropy during the boiling and condensing processes. Another important parameter is the enthalpy at the power condenser inlet. Its value reflects the degree of entropy generation in the expansion process. As indicated in Eq. (2.11), higher values of h6 (enthalpy at power condenser inlet) correspond to lower isentropic expansion efficiency, and thereby higher exergy destruction in the power cycle. Similarly, higher indoor air temperatures (to be cooled) and lower outdoor air (cooling agent) temperatures would result in higher exergy destruction in the cooling cycle because of larger temperature differences in both the evaporator and cooling condenser. A compressor with lower isentropic efficiency would also increase the value of h9 (enthalpy at the cooling condenser inlet), thus leading to higher cycle exergy destruction. For any given heat exchanger, the exergy transfer can be described in the following: Exergy supplied by the hot stream: - 71 6 H HN 8 (2.14) (2.15) (2.16) P,BA0 Exergy recovered by the cold stream: - 71 6 H HN C,BA0 Therefore the exergy destroyed inside the heat exchanger is: 8 - 6 - QR16HHN S6716HHN 8T P,BA0 C,BA0 7PDF Image | Performance of a Combined Organic Rankine Cycle
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