Experimental study of R450A drop-in performance in an R134a small capacity refrigeration unit

Makhnatch, Pavel; Mota-Babiloni, Adrián; Khodabandeh, Rahmatollah

doi:10.1016/j.ijrefrig.2017.08.010

Cited by 47 publications

(23 citation statements)

References 17 publications

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“…The focus is given to the difference between a set of condensation temperatures (representing different ambient temperatures) and the deviation between R134a and its alternatives. Experimental results using R513A and R450A at lower condensation temperatures can be found at Mota-Babiloni et al (2017b) and Makhnatch et al (2017).…”

Section: Resultsmentioning

confidence: 71%

R450A and R513A as lower GWP mixtures for high ambient temperature countries: Experimental comparison with R134a

Makhnatch

Mota-Babiloni

López-Belchí³

et al. 2019

Energy

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In recognition of the impact of the refrigeration sector on climate change, global commitments are achieved to replace hydrofluorocarbon substances with more planet-friendly alternatives. In this regard, countries with high ambient temperatures (HAT) face additional problems in identifying suitable alternatives due to the impact of such temperatures on energy performance in vapor compression systems. This paper presents an experimental analysis using R134a and two lower global warming potential (GWP) mixtures in a small capacity vapor compression refrigeration system for HAT environments. The range of evaporating and condensing conditions was selected to simulate a refrigeration system working at HAT conditions. The experimental operating results show that although R450A values are acceptable, R513A shows better adaptation to refrigeration system in terms of pressure ratio, discharge temperature and mass flow rate. Then, attending to experimental energetic results, R450A energy performance (quantified by COP) and cooling capacity is lower than R513A and R134a. TEWI analysis of a small refrigeration unit shows CO 2 equivalent emission saving when using R450A in the different condensation conditions. However, taking into account the variation of cooling capacity, R513A system results in the lowest TEWI when normalizing per unit of delivered cooling capacity.

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Section: Resultsmentioning

confidence: 71%

R450A and R513A as lower GWP mixtures for high ambient temperature countries: Experimental comparison with R134a

Makhnatch

Mota-Babiloni

López-Belchí³

et al. 2019

Energy

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“…In a similar work, Makhnatch et al. 18 investigated the performance of R450A (the mixture composed of R134a and R1234ze (E), in the ratio of 42:58, by mass) as drop-in substitute for R134a in domestic refrigerators. It was reported that cooling capacity and COP of R450A were found to be lower by about 10% and 3%, respectively, when compared to R134a.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, Aprea et al 17 compared the performance of a domestic refrigerator working with a refrigerant mixture composed of R1234ze (E) and R134a (in the ratio of 90:10, by mass) and reported with 14% energy savings compared to R134a. In a similar work, Makhnatch et al 18 investigated the performance of R450A (the mixture composed of R134a and R1234ze (E), in the ratio of 42:58, by mass) as drop-in substitute for R134a in domestic refrigerators. It was reported that cooling capacity and COP of R450A were found to be lower by about 10% and 3%, respectively, when compared to R134a.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations on R430A as a drop-in substitute for R134a in domestic refrigerators

Mohanraj

2018

Proceedings of the Institution of Mechanical Engineers, Part E:

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In this work, the energy performance of a domestic refrigerator has been experimentally investigated using R430A as a possible drop-in substitute to replace R134a. Experiments have been carried out in an R134a-based single evaporator domestic refrigerator of total volume 190 L. The pull-down and ON/OFF cycle performance tests were carried out at 32 ± 0.3 ℃ ambient temperature. The continuous running performance test was carried out for wide range of ambient temperatures between 24 ℃ and 43 ℃ by maintaining evaporator temperature at −12 ± 0.2 ℃. The experimental results showed that the R430A has 3.9% lower energy consumption with 3.8%–6.4% higher coefficient of performance when compared to R134a. However, the compressor discharge temperature of R430A was observed to be 2 ℃–4 ℃ higher when compared to R134a. The lubricant used in R134a compressors is physically stable and retains its lubricant property at 4 ℃ elevated temperature when operating with R430A. The total equivalent warming impact of R430A was found to be 4%–5% lower when compared to R134a due to its higher energy efficiency and lower global warming potential. The results confirmed that R430A is found to be a good drop-in substitute to phase out R134a in domestic refrigerator servicing sectors.

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“…They have a lower GWP values (547 and 562 for R450A and R513A, respectively), are low toxicity and non-flammable refrigerants, so they have been developed to cover air conditioning and refrigeration applications with safety. However, the energy performance of the refrigeration system and components has been studied with less coverage than that of the pure HFOs, due to the recent development of both refrigerants, and hence a few studies are available today [13][14][15][16][17].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Experimental exergy analysis of R513A to replace R134a in a small capacity refrigeration system

Mota-Babiloni

Belman-Flores

Makhnatch

et al. 2018

Energy

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The replacement of HFCs using lower GWP refrigerants in the coming years is a priority to reduce the predicted climate change. The exergy analysis of vapor compression systems can help to identify the feasibility of alternative fluids in existing installations and the potential to improve them. In this sense, this paper presents an exergy analysis of an experimental setup which operates with R134a and the alternative HFO/HFC mixture R513A. The evaporating temperature is ranges between-15°C and 5°C, while the condensing temperature is set at 30°C and 35°C. In this analysis, the highest amount of exergy destruction rate is obtained at the compressor, followed by the evaporator. The maximum exergy efficiencies are observed at the condenser and the thermostatic expansion device. Finally, the average global exergy efficiency of R513A when replaced R134a in this refrigeration experimental setup is 0.4% higher (absolute difference), and with respect to the components, there is only slight reduction in efficiency in the condenser using R513A. Therefore, the R513A replacement is acceptable according to the second law of thermodynamics.

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Experimental study of R450A drop-in performance in an R134a small capacity refrigeration unit

Cited by 47 publications

References 17 publications

R450A and R513A as lower GWP mixtures for high ambient temperature countries: Experimental comparison with R134a

R450A and R513A as lower GWP mixtures for high ambient temperature countries: Experimental comparison with R134a

Experimental investigations on R430A as a drop-in substitute for R134a in domestic refrigerators

Experimental exergy analysis of R513A to replace R134a in a small capacity refrigeration system

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