In this paper, an experimental work was investigated on nanorefrigerant .Nano Al2O3-PAG oil was used as nano-refrigerant in R134a vapour compression refrigeration system . An experimental setup was designed and fabricated in the lab. The system performance was investigated using energy consumption test and freeze capacity test. The results indicate that Al2O3 nano refrigerant works normally and...

Pool boiling heat transfer has been extensively studied over decades, but the effect of boundary heating conditions on boiling received little attention. In this work, heat transfer coefficients during pool boiling of five different refrigerants (R123, R245fa, R236fa, R134a, and R22) on the outside surface of a smooth copper tube were measured at the saturation temperature of 6.7 C; water flows...

Tek kademeli geleneksel buhar sıkıştırmalı soğutma çevrimi için R12, R22, R134A ve R404A soğutucu gazları kullanılmıştır. 4 gaz evaporatör sıcaklığı 263K, kondenser 303K, kütlesel debi 0,654(kg/s) kompresör izentropik verimliliği (0,7), ısı kaybı faktörü (%0,7), giriş 278K olarak belirlenmiştir. Evaporatör kapasitesinin (%0,7) azaltılmasıyla belirlenen yeni değer ile bir karşılaştırma yapılmışt...

In this study, three new mixed refrigerants with low GWP values, R1234yf/R134a, R1234yf/R125, and R1234yf/R13I1, were evaluated as replacements for R134a refrigerant using two vapor compression configurations. The experiment revealed that these mixtures can be used environmentally friendly alternatives configuration.

This paper presents an analytical evaluation of isobutane (R600a), propane (R290), R134a, R22, R410A, and R32 in a vapor compression system used for comfort cooling applications. The evaluation method was based on a system simulation model that was complimented with an evolutionary computation module for the optimization of refrigerant circuitries in the evaporator and condenser. The evaluation...

Atmospheric pollution and green house effects are now one of the major preoccupations to improve the general quality of life. With an electronic nose application we propose a system dedicated to the main detection of refrigerant Forane 134a (R134a) gas leakage in air conditioned systems and atmospheres. For our application based on a metal oxide type gas sensor array (six TGS elements) mainly c...

The thermodynamic surlace of R134a is expressed in terms of a 32-term modified Benedict· Webb-Rubin (MBWR) equation of state. Coefficients for this equation and for the ancillary equations representing the saturated liquid and vapor densities and the vapor pressure are presented. Temperatures are given on the new International Temperature Scale· of 1990 (lTS 90). The MBWR coefficients were obta...