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5.4.4 Case study of a micro-solar organic Rankine cycle 5.4.4.1 System description In section 5.4.3, it was shown that the simple Rankine cycle operating with R134a produces the highest exergetic efficiency. Here it is coupled to a solar collector loop to form the micro-solar thermal power system. The schematic of the system is shown on Figure 5.11. Solar collectors convert solar radiation into heat. The heat captured through the absorber is later transferred to a heat transfer fluid. This can be water or thermal oil (caloria, therminol VP-1). Usually, the heat transfer fluid after the collector enters a storage device. The storage acts as a buffer and reduces the effects of the fluctuations of the radiations on the system operation. In the present case it is not taken into consideration as the exergy destruction in such device is negligible (Wei et al., 2007). Heat transfer fluid exiting the collector array enters the evaporator. The cold collector fluid exits the evaporator and is pumped by the circulator back to the collector array where it is reheated. 1 43 5 2 collectors Circulator 7 6 Evaporator Condenser Solar 11 15 8 14 HFC-Pump 10 12 Expander 9 13 Figure 5.11 – Schematic diagram of the exergy flows in the system 5.4.4.2 Modeling of the system The exergy flow rate at any point of the system (see Figure 5.11) should be calculated. For the analysis, the system was considered at steady state and the pressure drops in components such as evaporator and condenser ignored. The circulator is used to overcome the pressure loss in the collector array so as to obtain a pressure value equal to atmospheric pressure at the collector outlet. Page | 130PDF Image | Low-Grade Heat Conversion into Power Using Small Scale Organic Rankine Cycles
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