Thermodynamic Analysis and Optimization of Secondary Overheating Parameters in Turbo-Expander Plants on Low Boiling Working Fluids

The paper presents a thermodynamic analysis of secondary overheating in turbo-expander plants on low-boiling working fluids. possibility optimizing the parameters fluid stem superheater has been studied. research was carried out for two typical cycles: with heat exchanger at outlet turbo-expander, intended cooling an overheated fluid, and without exchanger. Cycles T–s coordinates were constructed studied schemes. influence pressure temperature intermediate exergetic efficiency unit Thus, dependences losses elements cycle are obtained when changes not superheater, does change. As ozone-safe freon R236EA is considered, which “dry” saturation line characteristic, zero ozone layer destruction potential, global warming potential equal to 1370. It determined that increasing front low-pressure turbo expander (regardless scheme cycle) always cause increase efficiency. exceeding critical causes positive effect, but each there optimal will be maximum. At below pressure, leads decrease efficiency, maximum effect achieved absence steam superheater. All other things being equal, more efficient than it over entire range under study.