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3 Optimization of ORC for cooling purposes ORC can be used for cooling purposes. One example is cooling of electrical devices during operation. As in Figure 28 is shown, an intermediate fluid takes the heat from the device (=Technical equipment) which needs to be cooled to ORC unit. Then, ORC evaporator (5‐1) and pre‐heater (4‐5) will gain the heat from cooling circuit. ORC produces power from the gained heat from the device and the device is cooled. If needed, additional cooling by extra source in 03‐04 is introduced to gain lower temperature in point 04. Figure 28: ORC for cooling devices Source: Applied Energy, W. Nowak, A. Borsukiewicz‐Gozdur, A.A. Stachel , 2008.56 By assuming fixed amount of cooling of device by ORC evaporator(5‐1), less enthalpy change in evaporator requires more mass flow rate (m) of fluid to extract the same amount of heat and cool the device in evaporator(QEvaporator=m*ΔhEvaporator=cte). To achieve higher mass flow rates, pump will be adjusted to increase the mass flow rate. On the other hand, more enthalpy change in pre‐heater means better heat extraction from heat source in pre‐heater (4‐5), since (QPre‐heater=m*Δhpreheater). More mass flow rate and more gained heat in ORC means more power output from ORC unit (W=m*Δhturbine) . Due to given reasons, if enthalpy change in evaporator is becomes less and that in pre‐heater becomes higher, better cooling, less need for additional cooling device and more power from ORC are expected (W. Nowak, A. B‐Gozdur, A.A. Stachel, 2008). To investigate effect of different factors on cycle, a number called cooling factor (CF) is defined as equation 13. This factor is the ratio of enthalpy change in pre‐heater (4‐5) to enthalpy change in evaporator (5‐1). As mentioned, higher enthalpy change in pre‐heater and lower enthalpy change in evaporator is interesting and this means higher CF number. 56 W. Nowak, A. Borsukiewicz‐Gozdur, A.A. Stachel, Using the low‐temperature Clausius–Rankine cycle to cool technical equipment, Applied Energy 2008; 85: 582–588. 73PDF Image | Exergy
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