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Analysis of a solar assisted micro-cogeneration ORC system 257 Figure 2. Schematic representation of the micro-CHP system with thermal storage tank. Organic fluids are desirable for low temperature applications, due to their high molecular weight and positive slope of the saturated vapour curve in the temperature-entropy plane, both attributes simplifying the design of the expander [4]. Several fluids were analysed for the power circuit: ammonia, n-pentane, HFE7100, methanol, cyclohexane, toluene, R245fa and water. 3. System modelling and results 3.1 Power circuit (primary circuit) The inlet temperatures, point 1 in Figure 1, were 80oC, 120oC and 230oC, respec- tively for cycles 1, 2 and 3. At the condenser outlet the fluid is at 45oC (saturated liquid). Micro-cogeneration systems driven at low/medium temperatures (around 100oC) generate an amount of heat which is much higher than the generated power, and thus coupling with a thermal heat pump may be ideal. The efficiency of electricity production was calculated through equation 1. This efficiency represents the ratio between electrical power obtained from the micro- cogeneration system (W. - W. ) and thermal power input in the boiler and solar . system, through the heat exchanger (Q ). Regeneration was considered if the temperature at the turbine outlet (point 2) was higher than the temperature at the pump outlet (point 5). A regenerator efficiency of 80% was considered: International Journal of Low Carbon Technologies 3/4 η = Welect - Wpump (1) elect pump input QinputPDF Image | Analysis of a solar assisted micro cogeneration ORC
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