Theoretical investigation of the performance of some environment-friendly refrigerants in a sub-cooling heat exchanger refrigeration system

Abstract

As a result of global concerns over the depletion of the earth's protective stratospheric ozone layer by the atmospheric release of chloroflurocarbons (CFCs) and hydrochlorofluoro-carbons (HCFCs) refrigerants, their production has been restricted and they are no longer choices for new equipment. This paper presents theoretical investigation of the performance of some environment-friendly refrigerants in a sub-cooling heat exchanger refrigeration system. Five promising environment-friendly refrigerants (R23, R32, R134a, R143a and R152a) were selected from methane and ethane derivatives and they were investigated theoretically. Sub-cooling heat exchanger was used to evaluate the impact of selected refrigerants on the exchanger effectiveness, system capacity and coefficient of performance (COP). The results obtained showed excellent performance of R152a and R134a, and fair performance of R143a when compared with R12 in vapour compression refrigeration system. The results also showed that using R23 and R32 in the refrigeration system will be detrimental to the system performance.

Experimental analysis of reciprocating compressor performance with eco-friendly refrigerants

“…Owing to the reasons listed, the researchers prompted with the alternatives, which can be used instead of CFCs and HCFCs. A refrigeration system using new alternative refrigerants must be modified or newly designed because the thermophysical properties of these alternative refrigerants differ from those of conventional refrigerants [4][5][6].…”

Effects of Recirculation and Ventilating Airs on Performance of Air-Conditioning Systems

“…Works on refrigerants can be found in the works of Bolaji et al, (2011);Bolaji et al, (2010) ;Akintunde, (2004a, b); Kothari et al, (2012); Akintunde (2013) Kim et al, (2002); Kuehl and Goldschmidt (1991); and host of others. Works on refrigeration systems can be found in the works of Akintunde, (2004 a, b); Akintunde (2011);Adegoke et al, (2008);and Akintunde et al, (2004).…”

The effect the effectiveness of the liquid suction heat exchanger to performance of cold storage with refrigerant R22, R404A and R290/R600a

“…Where RCI is the refrigeration capacity index, RCsub is the refrigeration capacity with subcooling and RC is the refrigeration capacity without subcooling, which is calculated by the formula [2].…”

“…Performance liquid suction heat exchanger subcooling expressed in effectiveness ( ) said the ratio between the actual heat transfer rate to the optimum heat transfer rate is given by the equation [2][3][4][5] (4) In (3) COPsub declared COP system with liquid suction heat exchanger subcooling. Because, Δq/q and Δw/w always positive or greater than zero, the impact of performance liquid suction subcooling determined by Δq/q and Δw/w [3][4][5].…”

“…In the industrial field applied to the process of food preservation, and processing of chemicals, required temperatures from -30°C up to -50 C. Use of single cycle refrigeration system is only able to achieve to -40 C, and efficiency to deteriorate if temperatures below -35ºC, because of the pressure drop evaporation [6]. To obtain a low temperature to -50 C, the technology others used by the auto-cascade system, subcooling or using liquid nitrogen, or use the refrigerant type of CFC and HFC [2].…”