heat exchanger 31 again the heat exchanger 31 acts as an evaporator or boiler for the r245fa circuit with the r245fa refrigerant passing from the boiler 31 to the turbine 26 to a condenser 28 the pump 29 and back to the boiler 31 however unlike the condenser evaporator 23 of the fig3 embodiment the heat exchanger 31 acts as a desuperheater only within the toluene circuit with a condenser 32 then being applied to complete the condensation process before the working fluid is passed by way of the pump 24 back to the boiler 17 the ts diagram for such a nested orc cycle system is shown in fig6 in this nested arrangement a cost reduction is obtained by adding the low temperature r245fa orc system in such a way that the overall system efficiency is increased the major irreversibility thermodynamic loss of the simple cycle high temperature orc system is the so called desuperheat loss in the condenser organic fluids leave the turbine more superheated than they enter it the larger the pressure ratio at the turbine the stronger this effect high temperature simple cycle orc systems although thermodynamically more efficient than the simple cycle low temperature orc systems reject a lot of moderate temperature waste heat that has to be rejected in the desuperheater condenser as a result a relatively large condenser is required in the nested orc system desuperheating is done in the low temperature orc evaporator 31 this increases the overall power output since this heat was previously rejected to ambient and is now used in a low temperature orc system to generate power a further advantage is that the size of the.