Abstract
The environmental impacts like global warming and ozone depletion has become a challenge to the refrigeration and air conditioning industry. Chloro Fluoro Carbons (CFCs) and Hydro Flouro Carbons (HCFCs) are referred to as an Ozone Depleting Substances (ODS) because once these gases are released into the environment and reach the stratosphere, depletes the ozone layer. This research paper aims to study the performance characteristics of an R12 (CFC) vapour compression refrigeration system retrofitted with zeotrope blend of refrigerant R404a, used for cooling liquids with five different configuration of capillaries of diameters 0.033", 0.036", 0.044", 0.050" and 0.30" (2 Way). The refrigerant R404a is an alternate refrigerant to CFCs and HCFCs as they are ozone friendly and have less Global Warming Potential (GWP) than R12 and R134a. The parameters employed in analysis of the performance characteristics are the Evaporator load (Qe), Coefficient of Performance (COP), Work done by the compressor (Wc) and Refrigeration Effect (RE). A detailed experimentation was carried out to compare the performance and effectiveness of the system using five different capillaries. The result obtained from the observation will help to identify the optimum diameter of capillary which could be used in the system to give the best performance.
Highlights
Refrigeration finds its major application in domestic, commercial, industrial, transport and Food preservation and pharmaceutical industries
Due to the phase out of Chloro Fluoro Carbons (CFCs) which was responsible for major ozone depletion and global warming are being replaced by substitutes which are friendly to the environment. of R404a is Zeotropic refrigerant blend of R125/143a/134a (44, 52, 4%) which can be a suitable alternate for R134 a, R410a and CFC R502 Zeotropic refrigerants do not boil at constant temperatures unlike azeotropic refrigerants
Patil (2012) reported on the performance of an HFC-404A refrigeration system for a smooth U-tube con-denser and a micro-fin U-tube condenser for various operating conditions and observed that the cooling capacity of the system is increased by 10% and the coefficient of performance of the system is improved up to 17% using a micro-fin tube condenser
Summary
Refrigeration finds its major application in domestic, commercial, industrial, transport and Food preservation and pharmaceutical industries. Due to the phase out of CFC which was responsible for major ozone depletion and global warming are being replaced by substitutes which are friendly to the environment. Any substitute should generally possess operating conditions and have similar characteristics of the refrigerant for which Hydro Flouro Carbons (HFC’s) and its blends of refrigerants such as zeotropes are finding its applications in most of the commercial refrigeration sector as alternatesubstitutes and are cost effective Li and Zhao (2008). The results of experimental study carried out by Boloji (2011) to investigate the performance of R22 and some ideal properties like non flammability, non toxic, its ozone-friendly alternative refrigerants (R404A and friendly to the natural environment, stable at all R507) in a window air-conditioner on various performance. SenthilKumaran / American Journal of Environmental Science 10 (1): 35-43, 2014 parameters of the system revealed that R507 can be used successfully as a retrofitting refrigerant in existing window air-conditioners originally designed to use R22 in the event of HCFC phased out. Peethambaran and Kumar (2008) developed a simulation model to determine the suitability of an eco-friendly refrigerant for vapour compression refrigeration systems, which helps to predict the behaviour for all possible combinations against the actual experimental study within the tolerance limit set. Pyasi and Gupta (2011) presented analytical results of analyzing blends of HFC refrigerants such as 404a and 508b in Cascade Refrigeration System
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