Numerical research on R32/R1234ze(E) air source heat pump under variable mass concentration

Cheng, Zou; Wang, Baolong; Shi, Wenxing; Li, Xianting

doi:10.1016/j.ijrefrig.2017.06.014

Cited by 27 publications

(8 citation statements)

References 18 publications

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“…Furthermore, the performance of R1234ze(E) can be improved when the mixture of some refrigerants used to obtain required properties. The R444A consists of 83 % R1234ze(E), 12 % R32 and 5 % R152a, (by mass) and its GWP value is 93 [4] and [9] which meets the European regulations.…”

Section: Introductionmentioning

confidence: 85%

See 1 more Smart Citation

Experimental Investigation of an Automotive Air Conditioning System Using R444A and R152a Refrigerants as Alternatives of R134a

Di̇rek¹,

Mert²,

Soylu³

et al. 2019

SV-JME

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The conventional refrigerants used in refrigeration systems cause global warming effect if released into the atmosphere. To overcome this problem, refrigerants are classified according to their global warming potential (GWP) values, and some restrictions have been placed on the use and transport of these refrigerants with European regulations. Vapor compression refrigeration (VCR) systems are used to provide desired conditions in many systems and as well as in automobiles. Most of the automotive air conditioning (AAC) systems use R134a which has GWP value of 1300. In this study, the use of the refrigerants which have low GWP values, namely, R152a and R444A as an alternative to the R134a for AAC systems, were investigated experimentally. Moreover, the effect of a plate-type internal heat exchanger (IHX) added into the system was studied with the refrigerant R444A. The cooling capacity, compressor power, coefficient of performance (COP) and total exergy destruction have been determined as performance parameters. Based on the obtained results, the highest COP and cooling capacity were achieved when the R152a used as the refrigerant. Furthermore, the COP of the system was increased when the IHX was used, with R444A as the refrigerant.

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Section: Introductionmentioning

confidence: 85%

“…The highest COP was obtained when the system was working with R152a. Cheng et al [9] tested an air source heat pump (HP) system using the different concentrations of R32/R1234ze(E) mixture numerically.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of an Automotive Air Conditioning System Using R444A and R152a Refrigerants as Alternatives of R134a

Di̇rek¹,

Mert²,

Soylu³

et al. 2019

SV-JME

View full text Add to dashboard Cite

show abstract

“…They also determined that the COP of butane and isopentane were higher than propane and butane. Cheng et al, (2017), the mixture obtained with R1234ze(E) tested refrigerant in the heat pump system. In their study, the effect of various ratios of R1234ze(E) concentration on the performance of heat pump systems was evaluated.…”

Section: Systemmentioning

confidence: 99%

Volumetric Efficiency Evaluation of the Use of Refrigerants R445a, R515a, R456a, ND, and R516a with Low GWP Instead of R134a

İşkan

Di̇rek

Koyunoğlu

et al. 2021

Iğdır Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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In this study, the performance of different refrigerants (with low GWP value) depending on thermophysical properties in the cooling system was evaluated. The cooling capacities of R134a, R445a, R515a, R456a, ND, and R516a refrigerants used in the cooling system are determined per unit refrigerant. If the compressor speed values and the volumetric efficiency of the compressor are constant, the results of the effects of the refrigerants in the cooling system are compared with each other. When the system is operated with R445a, the highest COP value is obtained when the volumetric efficiency value is 0.7. The R515a provided the closest COP value to R134a when the compressor speed was 1750 rpm and the 98% coefficient of performance value was similar. When the refrigerants considered are evaluated together, it was determined that R445a provides the best values according to R134a and has an average cooling capacity of approximately 12% is higher.

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“…The zeotropic mixture of R1234ze(E) and R32 with mass fraction of 27/73 which was named L-41b was suggested to be an substitute of R410A in a recent study by AHRI (The Air-Conditioning, Heating, and Refrigeration Institute) [9]. Most of the studies available in literatures on the mixture of R1234ze(E) and R32 focused on the thermodynamic properties [10][11][12], and drop-in replacements in existing refrigeration system [1,[13][14][15][16]. In et al [17] presented L-41b drop-in test data of an R410A residential heat pump system.…”

Section: Introductionmentioning

confidence: 99%

Investigation of flow boiling heat transfer characteristic of mixture refrigerant L-41B in a horizontal smooth tube

Qiu¹,

Fang²,

Dai³

et al. 2018

THERM SCI

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The saturated flow boiling heat transfer characteristics of L-41b, R1234ze(E)/R32 (27/73 mass%), inside an 8 mm ID horizontal tube were investigated. The experiment were carried out at the saturation temperature of 10 to 20 °C with heat flux ranging from 5 to 10 kW/m 2 and mass flux ranging from 200-500 kg/m 2 s. The influence of mass flux, heat flux, and quality on the heat transfer coefficients were examined and discussed. The experimental data of local heat transfer coefficients were compared with four well-known correlations available in literatures. Additionally, a new vapour-phase multiplier correlation to predict the local heat transfer coefficients of L-41b flow boiling inside smooth tubes was developed. The results show that the deviations of the new correlation are within-24.98% to +14.68% to the experimental data and that the 95% prediction values are within ±15%.

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Numerical research on R32/R1234ze(E) air source heat pump under variable mass concentration

Cited by 27 publications

References 18 publications

Experimental Investigation of an Automotive Air Conditioning System Using R444A and R152a Refrigerants as Alternatives of R134a

Experimental Investigation of an Automotive Air Conditioning System Using R444A and R152a Refrigerants as Alternatives of R134a

Volumetric Efficiency Evaluation of the Use of Refrigerants R445a, R515a, R456a, ND, and R516a with Low GWP Instead of R134a

Investigation of flow boiling heat transfer characteristic of mixture refrigerant L-41B in a horizontal smooth tube

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