In this study, energy analysis of a double-stage Organic Rankine Cycle (ORC) was performed using the Engineering Equation Solver program (EES). first and second stages, eight different organic working fluids (R134a, R410a, RC318, R407c, R22, R23, R116, R218) were used in pairs for certain temperature limits. Choosing suitable refrigerant or pair is crucial ORC’s high thermal efficiency net work...

The critical heat flux (CHF) in forced convective upflow has been investigated in a uniformly heated vertical tube of 12.7 mm internal diameter and 3 m length for different reduced pressures ranging from 0.32 to 0.98, with non-azeotropic ternary refrigerant mixture R407C as the working fluid. The onset of CHF was determined by the sudden rise in the wall temperature of the electrically heated t...

In designing of condensers, the prediction of pressure drop is as important as the prediction of heat transfer coefficient. Modeling of two phase flow, particularly liquid – vapor flow under diabatic conditions inside a horizontal tube using CFD analysis is difficult with the available two phase models in FLUENT due to continuously changing flow patterns. In the present analysis, CFD analysis o...

This study includes energy and exergy analysis if air ground source 
 heat pumps are used for residential heating in Kastamonu province. The lowest soil temperatures measured between December March 2000-2021 were taken into account. R134a, R407c, R410a R500 as refrigerants the process that will benefit from heating. In discussed, ambient temperature to be heated was chosen same each pump, ...

The joint processes of bubble boiling and refrigerant movement in heat pump tubes are considered. A coil located on the back side photovoltaic panel (PVP) is used as an additional heating surface. mathematical model theoretical determination temperature front surface PVP cooled by freon from has been created. feature numerical simulation a was insufficiently detailed study process lack referenc...

Abstract The authors make a comparative study between an existing R407C indirect refrigeration system which serves ice rink plant with modern R744 incorporating heat recovery, by using “Pack Calculation Pro” software. proposed solution involves no alterations in the water-ethylene glycol circuit that ensures rink’s cooling load. By considering need for retrofitting to comply current legislation...

The results obtained from the exergoeconomic and exergy analysis of a model generic air conditioning (A/C) system without with an membrane exchanger using three commercially available refrigerants: R410A, R407C, R134a, are reported. used specialized software that was validated against recently published data showed good agreement. A/C systems energy intensive consume significant portion global ...