A household refrigerator designed to work with R-134a was used as an investigation unit to assess the prospect of using mixed refrigerants. The recital of the refrigerator using mixed refrigerant was investigated and compared with the performance of refrigerator when R-134a was used as refrigerant. The effect of condenser temperature and evaporator temperature on COP, refrigerating effect was i...

A performance analysis on a vapour compression refrigeration system with various refrigerants mixture of R152a, RE170, R600a, and R290 were done for various mixture ratios and their results were compared with R134a as possible alternative replacement. The results showed that all of the alternative refrigerants investigated in the analysis except R431A, [R 152a (29%), R290 (71%)] have a slightly...

The solubilities of four surfactants, sodium bis-2-ethylhexyl sulfosuccinate (AOT), cetyltrimethylammonium chloride, didodecyldimethylammonium bromide, and n-dodecyltrimethylammonium chloride in liquid refrigerant 1,1,1,2-tetrafluoroethane (R134a) modified with methanol, ethanol, and 2-propanol were measured. The measurements were performed under 25 and 50 bar at 25 C. The solubility of AOT was...

Recently, refrigerant 1,1,1,2-tetrafluoroethane (R134a) was considered as an extraction solvent alternative to supercritical fluid CO2. We measured water-liquid R134a partition coefficients of some organic compounds using a high-speed countercurrent chromatography (HSCCC). The experiment could be operated by moderate modification of the commercial instrument. The partition coefficient data were...

The thermal conductivity of mixtures of R365mfc (1,1,1,3,3pentafluorobutane), with R134a (1,1,1,2-tetrafluoroethane) and cyclopentane were measured using a transient hot-wire method, in the pressure range between 0.1013 and 0.7MPa and temperatures between 311 and 413K. The composition of the measured mixtures was 93.0% R365mfcþ 7.0% R134a (kg/ kg), 27.0% R365mfcþ 73.0% R134a (kg/kg) and 62.8% R...

air conditioning refrigerant r134a has value of global warming potential (gwp) 1300, which is much higher than mac directive (gwp below 150) passed in july 2006. this prompted a search for alternative refrigerant with gwp value less than 150. r1234yf is a new refrigerant which has lower gwp value of 4. effect of blower speed has been compared and flammability issue of r1234yf has been addressed...

An experimental performance comparison study on domestic refrigerator system was conducted and compared with HFC134a and M09 (HFC134a and HC blend (containing 55.2%HC600a and 44.8%HC290 by weight)) mixture refrigerant. The domestic refrigerator system was initially designed to operate with HFC134a.Experimental results showed that the refrigeration capacity of the refrigerant M09 mixture system ...

Two-phase flow distribution in evaporators has been shown to be directly affected by the development of the flow between the expansion device and the heat exchanger, namely, the separation characteristics of the two phases. For this reason the development of adiabatic two-phase R134a in an 8.7mm transparent PVC tube directly after an expansion valve was studied. This paper presents a mapping of...

This study investigates the performance of nanorefrigerants (R134a-ZrO2) in a domestic refrigerator at concentration 0.2 g/l without changing components. Nanoparticles ZrO2 g/L with particle size 1-10 nm and 140 g R134a have been charged, investigations were carried out. Energy consumption pull-down tests conducted to investigate refrigerator. The parameters like refrigeration capacity, compres...