Vapour compression refrigerator systems working with R134a are associated with high energy demand and environmental …, this research work investigated R600a in MWCNT-nanolubricant (0.4 g/L and 0.6 g/L) as a drop in replacement for R134a … compared with the result obtained through R134a refrigerant in the system. The result showed that R600a perform better in terms …

Vapour compression refrigerator systems working with R134a are associated with high energy demand and environmental …, this research work investigated R600a in MWCNT-nanolubricant (0.4 g/L and 0.6 g/L) as a drop in replacement for R134a … compared with the result obtained through R134a refrigerant in the system. The result showed that R600a perform better in terms …

substitute R-134a. Based on the limited information, it is found that the nucleate boiling heat transfer coefficient (HTC) and … convective boiling HTC for HFO-1234yf are comparable to R-134a provided q<200kWm−2. The critical heat flux for HFO-1234yf is … about 20–40% lower than that of R-134a. For external condensation, the only database shows that the HTC between HFO-1234yf …

working pair 1,1,1,2-tetrafluoroethane (R134a) and dimethylformamide (DMF). In order to investigate their performance, the …

evaluation of the environmental impact, in terms of greenhouse effect. R134a and R744 (CO2) are compared to one another. The … hydrofluorocarbon R134a has a large direct warming impact (GWP), whereas the R744 contribution is negligible. The greenhouse effect is … and indirect contributions to global warming. This paper compares a commercial R134a refrigeration plant and a prototype R …

investigated for various applications. Considering the first set of refrigerants i.e. R134a, R410A and R407C, from a first law … standpoint, the COP indicates that R134a always performs better unless only the evaporator is being fouled. From a second law … standpoint, the second-law efficiency indicates that R134a performs the best in all cases. Considering the second set of …

inlet temperature (22:34°C). R134a was used as a primary working fluid whereas water was adopted as a secondary heat …

Experiments were conducted for a typical R134a compact European automotive air conditioning system equipped with an … and efficiency as modern R134a systems. Since the experimental results indicate that, for a given cooling capacity, R1234 …yf systems present lower performance than the baseline R134a, numerical simulations were used to investigate the effects …