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23 Heat transfer area For solar based ORC it is two possibilities to transfer heat into ORC. One method is to use ORC fluid in direct connection with collector, and the other is to use another fluid to transfer heat from collector to ORC fluid. In first case total needed heat transfer area is about 20m2/kWh and for second case it is about 25m2/kWh.55 24 Optimized temperature based on Collector and ORC efficiencies System under study is fairly similar to system in Chapter Ι‐3. Here, an intermediate fluid can works between ORC evaporator and solar collector (In some applications this fluid is ORC fluid itself). The collector heat is transferred to ORC boiler (evaporator) by the intermediate fluid and power is generated in ORC. Even waste heat of system can be used in a heat pump to meet the thermal load. Since in this study, the system is investigated for its ORC performance, following electricity load is much interesting option rather than focusing on thermal load. However, ORC can only be in operation while available recovered thermal energy is more than thermal load of system. Figure 26: Solar ORC Source: Source: Applied Thermal Engineering, W. Yagoub, P. Doherty, S.B. Riffat, 2006. 55 Delgado-Torres AM, García-Rodríguez L. Analysis and optimization of the low-temperature solar organic Rankine cycle (ORC). Energy Convers Manage (2010), doi:10.1016/j.enconman.2010.06.022 68PDF Image | Exergy
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