Comparative performance analysis of experimental frigorific air conditioning system using R-134a and HFO-1234yf as a refrigerant

Di̇rek, Mehmet; Tunçkal, Cüneyt; Yüksel, Fi̇kret

doi:10.2298/tsci140715130d

Cited by 6 publications

(3 citation statements)

References 5 publications

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“…When R1234yf was used in this study, the COP increased slightly compared with R134a. Direk et al [9][10][11][12][13] conducted an experiment to analyze the performance of R1234yf when used as an alternative refrigerant to R134a. In this study, a test bench consisting of two air-cooled heat exchangers, two expansion valves, a four-way valve, and a compressor was constructed using the equipment for an automobile air-conditioning system for a European compact automobile.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of an Air-Conditioning System in an Electric Vehicle with R1234yf

Song,

Eom,

Lee

et al. 2023

Energies

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R134a, a vehicle refrigerant used in the vehicle heat pump system, is regulated according to the Montreal Protocol. Refrigerants such as R1234yf, R744, and R290 in vehicle heat pump systems are being investigated to identify their alternatives. Because developing a new system exclusively for new refrigerants is costly, an empirical test was conducted on the R1234yf refrigerant in a heat pump system designed for the R134a refrigerant in an actual vehicle system. The heating, cooling, and battery-cooling modes were tested for the amount of refrigerant charge, and operability tests were conducted for the compressor load; heating, ventilation, air conditioning (HVAC) air flow rate; coolant temperature; and flow rate of each mode. The optimal refrigerant charge in heating mode was 0.7 kg, and the optimal refrigerant charge in the cooling and battery-cooling modes was 0.9 kg. To yield the highest coefficient of performance of the system, the compressor load was 50%, the HVAC fan was 12 V, and the coolant flow rate was 10 LPM. The most efficient system operation was possible at a coolant temperature of 30 °C in the cooling and heating modes and at 20 °C in battery-cooling mode.

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Section: Introductionmentioning

confidence: 99%

Experimental Study of an Air-Conditioning System in an Electric Vehicle with R1234yf

Song,

Eom,

Lee

et al. 2023

Energies

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“…The R1234yf can be used directly or with small modifications instead of R134a in AAC systems [3]. However, recent studies showed that the cooling capacity and COP values were about 4% ~ 18% and 1% ~ 15% lower when R1234yf used is in the system designed for R134a without any modification [4][5][6][7]. This is due to the R1234yf has between 21% and 28% lower latent heat of vaporization at the same saturation temperature in comparison with R134a.…”

Section: Introductionmentioning

confidence: 99%

Automotive air conditioning system with an internal heat exchanger using R1234YF and different evaporation and condensation temperatures

Di̇rek¹,

Kelesoglu²

2019

Therm sci

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This study presents the energy and exergy analysis of a R1234yf automotive air conditioning system. For this aim, an experimental baseline automotive air conditioning system was developed and a double pipe internal heat exchanger was employed to the system. The detailed performance comparison of the system under different condensation and evaporation temperatures was studied for both the baseline system and the system with the internal heat exchanger. For this, the cooling capacity, COP, and the total exergy destruction per cooling capacity were evaluated. Additionally, the volumetric and isentropic efficiencies of the compressor were investigated. It was determined that the internal heat exchanger has increased COP and decreased exergy destruction per cooling capacity by 4%-6% and 13%-16%, respectively.

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“…Direk et al [18] carried out an experimental analysis to compare the performance of R134a and R1234yf using a frigorific air conditioning system at different amount of charges. They claimed that the time dependent temperature gradient is compatible for both refrigerants.…”

Section: Introductionmentioning

confidence: 99%

Drop-in Performance Analysis and Effect of IHX for an Automotive Air Conditioning System with R1234yf as a Replacement of R134a

Di̇rek¹,

Kelesoglu²,

Akin³

2017

SV-JME

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This paper presents the experimental comparative performance analysis of an automotive air conditioning (AAC) system using R1234yf and R134a. For this purpose, an AAC experiment setup used for R134a was built to obtain the drop-in performance of a new refrigerant R1234yf. Among the low global warming potential (GWP) refrigerants, R1234yf was particularly chosen due to its similar thermo-physical properties with R134a. However, the system with R1234yf could not perform as efficiently as R134a can. Therefore, an internal heat exchanger (IHX) was employed to enhance the performance of the R1234yf system. After that, the performances of R1234yf and R134a were compared under various compressor speeds and air stream temperatures. The results showed that the cooling capacity and COP of the system with R1234yf were 17.1 % and 12.4 %, respectively, lower compared to the one with R134a. However, when the IHX was introduced into the system with R1234yf, the cooling capacity and COP values were significantly enhanced by 7.9 % and 4.1 %, respectively.

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Comparative performance analysis of experimental frigorific air conditioning system using R-134a and HFO-1234yf as a refrigerant

Cited by 6 publications

References 5 publications

Experimental Study of an Air-Conditioning System in an Electric Vehicle with R1234yf

Experimental Study of an Air-Conditioning System in an Electric Vehicle with R1234yf

Automotive air conditioning system with an internal heat exchanger using R1234YF and different evaporation and condensation temperatures

Drop-in Performance Analysis and Effect of IHX for an Automotive Air Conditioning System with R1234yf as a Replacement of R134a

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