Exergy analysis of R1234yf and R1234ze as R134a replacements in a two evaporator vapour compression refrigeration system

“…It is one of the most stable materials in metal-organic frameworks. Fluoroethane (R1234ze) [21] is an organic refrigerant commonly used in recent years. Its Ozone Depression Potential (ODP) is 0, and its Global Warming Potential (GWP) is less than 10.…”

Section: Introductionmentioning

confidence: 99%

Molecular Simulations of Adsorption and Thermal Energy Storage of Mixed R1234ze/UIO-66 Nanoparticle Nanofluid

Wang

Tang

Tian

et al. 2019

Journal of Nanomaterials

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In the process of adsorption and separation of fluid molecules on the solid surface of porous nanomaterials, the mutual transformation of thermal energy and surface energy can improve the heat absorption and energy utilization efficiency of circulating working medium. In this study, the adsorption, thermal energy storage, and mean square displacement of the minimum energy adsorption configuration of R1234ze in UIO-66 were studied by molecular simulations, including molecular dynamics (MD) and grand canonical Monte Carlo (GCMC) simulations. The results show that the thermal energy storage density of R1234ze/UIO-66 mixed working medium is significantly higher than that of pure working medium in the temperature range of 20 K-140 K. However, the increase rate of thermal energy storage density decreases significantly as temperature rises, and the mean square displacement and diffusion coefficient increase with increasing temperature.

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“…-1524 Another candidate refrigerant R1234ze(E) has been proposed in new systems of medium temperature applications [8] because the vapor pressure of R1234ze(E) is between -28% and -24% compared with R134a. Yataganbaba et al [9] presented exergy analysis of R1234yf and R1234ze(E) in a two-evaporator refrigeration system. Lastly, Qi [10] investigated the performance improvement potentials of R1234yf in mobile air conditioning system under various operation conditions.…”

Section: Introductionmentioning

confidence: 99%

Performance improvement potentials of low global warming potential refrigerants for intercity bus air conditioning system

Ünal¹,

Kutlu²,

Erdinç³

2018

THERM SCI

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Original scientific paper https://doi.org/10.2298/TSCI160704084UIn this study, theoretical investigation of two evaporator ejector refrigeration system was carried out based on energy and exergy analysis using R134a and low global warming potential refrigerants (namely R1234yf and R1234ze(E)). In order to perform the analyses, a simulation model was developed and then the influence of different parameters on the COP, COP increase rate and exergy destructions were discussed for each refrigerant. The model was validated with experimental data for R134a and later used to predict the behavior with R1234yf and R1234ze(E). It was found that the highest exergy destruction occurs in the R1234yf system and the increase rate in the COP with respect to the conventional system by using ejector as an expansion device are 15% for R134a, about 17% for R1234yf and about 15% for R1234ze(E), respectively.

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Exergy analysis of R1234yf and R1234ze as R134a replacements in a two evaporator vapour compression refrigeration system

Cited by 131 publications

References 25 publications

Molecular simulation of energy storage of R1234yf, R1234ze(z), R32, and their mixtures in Co-MOF-74 materials

Molecular simulation of energy storage of R1234yf, R1234ze(z), R32, and their mixtures in Co-MOF-74 materials

Molecular Simulations of Adsorption and Thermal Energy Storage of Mixed R1234ze/UIO-66 Nanoparticle Nanofluid

Performance improvement potentials of low global warming potential refrigerants for intercity bus air conditioning system

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