Abstract
An existence of low stability region in the dense vapours and its influence on some peculiarities in behaviour of selected dry and isentropic ORC fluids is discussed. The retrograde phenomena in the flow of BZT fluids [1.] can be simply related to the mechanical and thermodynamic stability parameters. These new refrigerant and their properties have been analysed based on the software tools REFPROP v.9.1 [2.]. Test examples have confirmed an importance of low thermodynamic stability area in the vicinity of saturation boundary line and neighbourhood of critical point of the fluid. The analytical results have been obtained for selected pure fluids applicable in the ORC and heat pump technology such C 4 H 10 , C 6 H 5 CH 3 , C 12 H 26 , R123, R134a, R227ea, R245fa, low GWP hydrofluoroolefins (R1234xxX)and a group of linear and cyclic siloxanes.
Highlights
Different thermodynamic cycles have been developed in practice
Still a lot of waste heat is being released in these cycles often on relatively high temperatures
It is caused by rapid growth of interesting in utilization of renewable and waste heat energy resources including Organic Rankine Cycle (ORC) and heat pumps
Summary
MATEC Web of Conferences or flammability and the environmental safety problems will be limiting for their applications [1.]
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