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Figure 33: Axial turbine ..........................................................................................................................................94 Figure 34: Screw expanders ...................................................................................................................................95 Figure 35: A basic fuel cell......................................................................................................................................96 Tables: Table 1: Classification of ORC application based on power, heat source temperature and producers ................ 10 Table 2: Cost reduction options in biomass ORC ................................................................................................... 12 Table 3: A 10kW ORC box information................................................................................................................... 22 Table 4: ORC in comparison with steam cycle for gas turbine bottoming cycle....................................................38 Table 5: Heat recovery options from fuel cells ...................................................................................................... 44 Table 6: Effect of pinch point temperature on exergy loss in evaporator (exeloss1) ............................................ 54 Table 7: Low heat source temperature ORC (ORC cycles with heat source temperature of mostly less than 150°C). ............................................................................................................................... ..................................... 54 Table 8: Exergy efficiency changes with degree of superheat ............................................................................... 54 Table 9: Turbine size factor variation with evaporator saturation temperature and degree of superheat (Tpp is pinch point temperature in evaporator and T is degree of superheat)................................................................ 58 Table 10: Isentropic flow ratio change with pinch point and degree of superheat modifications ........................ 59 Table 11: Effect of pump efficiency on evaporator pressure and total cycle efficiency........................................60 Table 12: Variation of ORC thermal efficiency with mass flow .............................................................................. 61 Table 13: Heat source fluid mass flow variation effect on ORC efficiency and output power .............................. 62 Table 14: Solar Collector data ................................................................................................................................69 Table 15: Effect of intermediate fluid temperature on collector, ORC and total system performance ................ 70 Table 16: Effect of constant superheat on turbine size factor (SF) and Heat exchangers factor (HEF).................71 Table 17: Effect of condenser temperature on ORC efficiency and output power ............................................... 72 Table 18: Effect of evaporator pressure on CF....................................................................................................... 75 Table 19: Mass flow rate effect on CF and ORC performance ............................................................................... 75 Table 20: R227ea ORC performance for cooling .................................................................................................... 76 Table 22: R245fa ORC performance for cooling ..................................................................................................... 77 3PDF Image | Exergy
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