In this study, hydrofluoroolefin R515B was used rather than hydrofluorocarbon R134a to perform energetic, exergetic, environmental and enviroeconomic analyses on vapor-compression refrigeration systems with internal heat exchangers. The exergy efficiency, destruction, coefficient of performance for cooling mode (COP) were studied. EES (Engineering Equation Solver) program employed thermodynamic...

R1234yf is a synthetic HFO refrigerant co-developed as replacement for R134a in automotive air conditioning applications. Thus, this study, alternatives to the that were removed from newly produced devices examined. The performance of cooling processes and R744 gases was compared with R134a. A simulation model first developed. This validated experimental results. Analysis conducted both heating...

Smart cooling solutions are required for modern electronic devices as heat flux is continuously increasing while component size is shrinking day by day. Two phase heat transfer within compact channels can cope with high heat flux applications. Two phase heat transfer in narrow channels was the subject of many studies from last decade. The mechanisms involved, however, are not fully clear and th...

Este trabajo presenta la viabilidad de los refrigerantes R1234ze(E) y R516A para ser usados en refrigeración doméstica como reemplazo directo del R134a. Se evaluó un refrigerador doméstico instrumentado con el fin caracterizar su desempeño. definió carga óptima refrigerante a través mínimo consumo energía, resultando una 80 g 84 R1234ze(E), lo que representó menor respecto al R134a (90 g). Acor...

Due to the entry into force in 2014 of European F-Gas Regulation n° 517/2014 and subsequent Kigali amendment, phase-out medium high-GWP refrigerants has speeded up all refrigeration fields. The effect on plug-in or stand-alone systems meant that other environmentally friendly must replace R134a with low ultra-low GWP maintaining same operating conditions reducing energy consumption. Extended ex...

Results: The calculated results show that because of high system pressure for R290 and R134a, R600a is the more suitable working fluid for ORC in terms of expander size parameter, system efficiency and system pressure. In addition, R600a is also the most appropriate working fluid for VCC in terms of pressure ratio and coefficient of performance. R600 and R600a are more suitable working fluids f...