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Figure 9: Hybrid solar and gas driven combined heat and power cycle with ORC Source: Applied Thermal Engineering 12 Illustrated system in Figure 8 can be run by a heat source down to 25kW. When the energy from sun suffices, the system uses only solar energy. The alternative heat source which might be a gas burner increases the availability of the system while solar energy is not sufficient. It can replace the solar energy and produce up to 100% heat input (25kW). Evacuated glass tube solar collector is connected to compact brazed heat exchanger which is used as evaporator of ORC unit. A heat pump is added to solar collector to use its waste heat which is not used in ORC evaporator. The pump of this unit needs to be accurate; as a result a double diaphragm pump is chosen. Turbine speed is 60000 rpm here. The ORC working fluid in this power range and low temperatures of about 90°C is chosen to be HFE‐301. This fluid has low boiling temperature in 3‐4 bars as 75°C, is not flammable as 12 W. Yagoub, P. Doherty, S.B. Riffat. Solar energy‐gas driven micro‐CHP system for an office building. Applied Thermal Engineering 2006; 26: 1604‐1610. 20PDF Image | Exergy
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