Performance assessment of alternate refrigerants for retrofitting R22 based air conditioning system (original) (raw)
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Energy & Buildings, 43(11); 3139-3143, 2011
In this study, experimental research was carried out to investigate the performance of R22 and its ozone-friendly alternative refrigerants (R404A and R507) in a window air-conditioner. The performance parameters of the system using R22 were considered as benchmarks and those obtained using alternative refrigerants were compared. Experimental results showed that R22 had the lowest pressure ratio and discharge temperature closely followed by R507. The average discharge temperature obtained using R507 and R404A were 4.2% and 15.3% higher than that of R22, respectively. The lowest compressor power and energy consumption were obtained from R507 retrofitted system. Also, the highest refrigeration capacity and Coefficient of Performance (COP) were obtained using R507 in the system. The average refrigeration capacities of R507 and R404A were 4.7% higher and 8.4% lower than that of R22, respectively, while the average COP of R507 increased by 10.6% and that of R404A reduced by 16.0% with respect to that of R22. Generally, the investigation has 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.
Scientific Journal of Maritime Research, 2017
A B S T R A C T Ozone depletion and global warming are presently the most serious global environmental problems and they have led to drastic changes in the refrigeration technology. Therefore, environment-friendly refrigerants have attracted a significant attention. This paper presents the thermodynamic study of non-ozone depleting R429A, R435A and R457A refrigerants as substitutes for R22 in airconditioning systems. The results obtained showed that the vapour pressure curves of R429A, R435A and R457A are very close to that of R22 with advantage of lower deviation in pressure. These refrigerants also exhibited lower pressure ratio and discharge pressure than R22 and their average discharge temperatures are 24.03, 13.54 and 28.53 % respectively lower than that of R22. They showed higher coefficient of performance than R22 with the average values of 2.47, 3.96 and 2.98 % respectively higher which shows better efficiency. The results also revealed R429A, R435A and R457A as energy efficient refrigerants as they exhibited lower power consumption per ton of refrigeration with average values of 2.14, 3.90 and 2.27 % respectively lower than that of R22. Generally, the three investigated environment-friendly refrigerants performed better than R22 and can effectively replace R22 in airconditioning systems.
2012
R22 that has been used predominantly in air conditioning and in medium and low-temperature applicationscontains ozone depleting chlorine atoms and hence will be phased out eventually. This paper presents the experimental performance study of a split-air-conditioner using ozone friendly alternative refrigerants.The existing split-air-conditioner originally designed for R22 as the working fluid was retrofitted with R410A and R417Arespectively, and the performance of the system was evaluated and compared with its performance when R22 was used. Experimental results showed that with R417A, the system had 1.9% higher refrigeration capacity and 14.2% lower withR410A when compared to that of R22. The average discharge pressure of the compressor obtained withR417A and R410A were 3.8% lower and 10.3% higher, respectively, than with R22. The lowest compressor power consumption and pressure ratio were obtained with theR417A retrofitted system. The average coefficient of performance (COP) obtained using R417A is 2.9% higher, while that of R410A is 8.4% lower than that of R22. Generally, with R417Athe system consistently had the best performance in comparisonto both R22 and R410A, indicating thatR417A would be a better choice for retrofitting existing split-air-conditioners originally designed to use R22 as working fluid.
The Montreal Protocol has sealed the use of Halogenated Hydrocarbons; Keeping in view they affect the environment in the form of Ozone layer depletion and Global warming. Thus one of the major thrust areas is to identify substitute of Halogenated Hydrocarbons, especially CFCs. The substitute refrigerant should be eco-friendly, chemically stable and C-134a a is currently the leading alternative to CFC-12. Other promising substitutes are R-507as a binary mixture of R-143a &R-125.R-407c is a ternary mixture of R-134a, R-32 andR-125.R404a is a binary mixture of R143a &R-125a. In this paper, performance evaluation of eco-friendly alternate refrigerant R-507, R-407c for replacing CFC12 has been done and a suitable alternative refrigerant for retrofitting has been identified.
Performance Investigation of Refrigerants R290 and R134a as an Alternative to R22
2018
Air conditioning system works on principle of vapour compression refrigeration cycle. Efficiency of air conditioning system depends on the properties of refrigerant. But currently used refrigerants (HCFCs) such as R12, R123 has large amount of Global Warming Potential (GWP) and Ozone Depletion Potential (ODP). According to Montreal protocol and Kyoto protocol these refrigerants are promised to be banned after 2020. One of the ways to reduce GWP and ODP is the use of alternative ecofriendly refrigerant such as hydrocarbon and blend refrigerant mixture. In this study, analysis of performance of two alternative refrigerants, R290 and R134A, along with R22 are done. Experiments were perform on different refrigerant under predetermined conditions by considering various performance parameters such as refrigerant mass flow rate, cooling capacity, energy efficiency ratio, coefficient of performance, and compressor work.One ton of refrigeration (1TR) air conditioner is designed and fabricate...
2018
Hydrocarbons, in the environmentally friendly group have drawn much attention of scientists and researchers for application as refrigerants. In this work, the performance of two eco-friendly hydrocarbon refrigerants (R510A and R600a) in a retrofitted vapour compression refrigeration system was investigated experimentally and compared with the baseline hydro fluorocarbon refrigerant (R134a). Thermocouples and pressure gauges were fitted at the inlet and outlet of the compressor, condenser, and evaporator to measure the temperature and pressure of the refrigerant at various stages of the refrigeration cycle. The results obtained showed that the coefficient of performance (COP) of the system using the two hydrocarbon refrigerants was higher than the coefficient of performance (COP) obtained using R134a as a working fluid. Generally, the two hydrocarbon refrigerants performed better than R134a, but R510A gave the best overall performance in that it exhibited the lowest discharge pressur...
Nase More (Our Sea: International Journal of Maritime Science and Technology), 2018
Halocarbon refrigerants have been scheduled for total phase out because they contributed significantly to the two major global environmental problems-ozone layer depletion and global warming. In this study, the performances of the environmentally friendly R510A and R600a in a retrofitted domestic refrigerating system were investigated experimentally and compared with the performance of R134a. The results obtained showed that R510A has the lowest discharge pressure with an average value of 13.4 % lower than that of R134a. The average pressure ratios of R510A and R600a were 16.91 and 12.17 %, respectively, lower than that of R134a. The Volumetric Cooling Capacity obtained for R510A was 5.34 % higher than that of R134a. R510A and R600a exhibited higher refrigerating effect and Coefficient of Performance (COP) than R134a. The average COPs for R510A and R600a were 22.26 and 3.06 %, respectively, higher than that of R134a. Generally, R510A and R600a performed better than R134a and they can be used as retrofit substitute refrigerants for R134a in the existing domestic refrigerators. The best performance was obtained from the use of R510A in the retrofitted system.
2012
Performance of two ozone-friendly refrigerants (R410A and R419A) was investigated theoretically using computational thermodynamic analysis. The results obtained showed that the performance of R410A was very close to that of R22 in all the operating conditions. Both R22 and R410A performed better than R419A in terms of their COP and refrigerating effect. Compared with R22, the average COP and refrigerating effect of R419A are lower by 13.78 and 33.96%, respectively. Generally, R410A refrigerant has approximately the same performance with R22, therefore, it is considered as a good drop-in substitute for R22 in vapour compression air-conditioning system.
Transactions of Famena, 38 (3); 59-70, 2014
The paper presents a theoretical investigation into the performance of R432A and R433A refrigerants as alternatives to the ozone depleting R22 refrigerant. The two refrigerants have zero ozone depleting potential and a negligible global warming potential. The results obtained showed that the properties of the three investigated refrigerants are similar. The saturation vapour pressures for R432A and R433A, between the saturation temperatures of-30 to 40 o C, are 99.6 and 99.3% the same as that of R22. The performance of R22 in terms of power per ton of refrigeration (PPTR), volumetric refrigeration capacity (VRC) and coefficient of performance (COP) is slightly better than the performance of the two alternative refrigerants. The average COPs obtained for R432A and R433A were lower by only 4.5 and 5.4%, respectively, than those of R22, but the two alternative refrigerants equally exhibited better pressure ratios, discharge temperatures and pressures than R22. Both R432A and R433A have higher refrigerating effects than R22. The VRC and COP of R432A are higher by 3.8% and 0.9%, respectively, than those of R433A. Generally, the performance of the two alternative refrigerants is quite similar in all operation conditions and they have shown satisfactory performance as good long term alternatives to R22 refrigeration systems.
2017
Alternative refrigerants Ozone depleting R22 R429A R435A R457A A B S T R A C T Ozone depletion and global warming are presently the most serious global environmental problems and they have led to drastic changes in the refrigeration technology. Therefore, environment-friendly refrigerants have attracted a significant attention. This paper presents the thermodynamic study of non-ozone depleting R429A, R435A and R457A refrigerants as substitutes for R22 in airconditioning systems. The results obtained showed that the vapour pressure curves of R429A, R435A and R457A are very close to that of R22 with advantage of lower deviation in pressure. These refrigerants also exhibited lower pressure ratio and discharge pressure than R22 and their average discharge temperatures are 24.03, 13.54 and 28.53 % respectively lower than that of R22. They showed higher coefficient of performance than R22 with the average values of 2.47, 3.96 and 2.98 % respectively higher which shows better efficiency. T...