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enthalpy with the enthalpy after turbine and knowing boiler discharge pressure, moisture content of medium after boiler will be calculated. A microprocessor is foreseen to do these simple control measures. Normal ORC boilers along with boilers of ORCs with wet admission ability in turbine are depicted in Figure 24.50 Figure24: A‐ Normal boiler system B‐ Boiler system with possibility of wet vapor outlet Source: ASME International Mechanical Engineering Congress and Exposition51 1­10 Regenerator Main responsibility of this section is to improve the cycle efficiency by pre‐heating the ORC working fluid exiting the pump. This is done by extracting heat from superheated fluid after the expander. For regenerator usage several issues shall be considered. First of all, if ORC fluid is dry then using regenerator is reasonable. Secondly, it should be noted that for applications where final exhaust temperature in heat source side is fixed using regenerator is considerable. Imagine that exhaust medium of heat source will be used in district heating system and needs to be in a certain temperature. In this case regenerator can be considered. Otherwise, regenerator will yield in more evaporator inlet temperature for ORC fluid and this will results in less heat recovery from heat source. This is true that using regenerator will cause less irreversibility in evaporator and gives better heat transfer, but on the whole, with variable heat source, less heat is extracted from heat source since higher temperature ORC 51 H. Leibowitz, I. K. Smith, N Stosic, Cost effective small scale ORC systems for power recovery from low grade heat sources, ASME International Mechanical Engineering Congress and Exposition 2006; Pages 5‐6. 64

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