Comparative analysis of HFO-1234ze(E) and R-515B as low GWP alternatives to HFC-134a in moderately high temperature heat pumps

Mateu-Royo, Carlos; Mota-Babiloni, Adrián; Navarro-Esbrí, Joaquin; Barragán-Cervera, Ángel

doi:10.1016/j.ijrefrig.2020.12.023

Cited by 36 publications

(17 citation statements)

References 23 publications

(22 reference statements)

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“…It was noted that the usage of an inner heat exchanger in a cooling system increases the energy efficiency of both refrigerants. Matu-Royo et al ( 2021) [8] have examined R1234ze(E) and R515B refrigerants with lower GWP instead of R134a in the heat pump system. They found that the energy and environmental performance of R1234ze(E) and R515B are almost the same as that of R134a and the lack of flammability of R515B is an important advantage in terms of safety.…”

Section: Introductionmentioning

confidence: 99%

Comparative Energetic, Exergetic, Environmental and Enviroeconomic Analysis of Vapour Compression Refrigeration Systems Using R515B as Substitute for R134a

Yildirim

Şahin

Dikmen

2022

International Journal of Thermodynamics

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In this study, hydrofluoroolefin R515B was used rather than hydrofluorocarbon R134a to perform energetic, exergetic, environmental and enviroeconomic analyses on vapor-compression refrigeration systems with internal heat exchangers. The exergy efficiency, exergy destruction, and coefficient of performance for cooling mode (COP) were studied. EES (Engineering Equation Solver) program was employed for thermodynamic analysis. The impact on the COP, exergy destruction, and exergy efficiency of the system was investigated at various evaporator and condenser temperatures. Performance analysis shows that the COP of R515B refrigerant is like that of R134a. It has been found that the exergetic efficiency of R515B was slightly lower (about 1.40%) than that of R134a. It has also been found that at higher evaporation temperatures, the total exergy destruction increases. The most important exergy destruction occurs in the compressor. The environmental and enviroeconomic indexes of R515B refrigerant were like those of R134a. The results demonstrated that R515B may be a good alternative to R134a in the vapourcompression refrigeration systems with internal heat exchangers.

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Section: Introductionmentioning

confidence: 99%

Comparative Energetic, Exergetic, Environmental and Enviroeconomic Analysis of Vapour Compression Refrigeration Systems Using R515B as Substitute for R134a

Yildirim

Şahin

Dikmen

2022

International Journal of Thermodynamics

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“…According to the Kigali Amendment to the Montreal Protocol, hydrofluorocarbon (HFC) emissions should be gradually reduced; thus, the phaseout of R134a for vehicle AC/ HP systems is inevitable worldwide (Wu et al, 2020). New synthetic hydrofluoroolefins (HFOs) are considered as part of the fourth generation of low GWP refrigerants used as a replacement for hydrofluorocarbons (HFCs); for instance, R1234ze and R1234yf are gaining increasing attention as alternatives to R134a (Dai et al, 2015;Mateu-Royo et al, 2020). However, owing to their complex molecular structures, HFOs are costly.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic analysis of CO2 blends for vehicle heat pump at cold ambient temperature

Liu

Sun

et al. 2022

Front. Energy Res.

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The use of heat pump is a promising way of energy conservation to improve the driving range of electric vehicles. In this study, the thermodynamic characteristics of CO2–based blends in the operation of a subcritical heat pump cycle are evaluated at different ambient temperatures considering two operation modes. Coefficient of performance (COP) and volumetric heating capacity (VHC) are used to evaluate heat pump performance. Optimization and comparison of both transcritical and subcritical cycles are conducted using various refrigerants. The results indicated that CO2/R32 (50/50) always outputs higher COP than CO2 or other mixtures. The COP of CO2/R41 (90/10) is inferior to that of CO2 in a transcritical cycle due to the more power consumption of compressor. The blends of R1234yf and R152a with low GWP have lower COP, but a much lower operation pressure is also achieved. CO2 blends have larger VHC, which facilitates simple cycle configuration and compact compression.

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“…The refrigerants employed in vapor compression have moved from CFCs and HCFCs, with Ozone Depletion Potential (ODP), to HFCs, greenhouse gases with a high Global Warming Potential (GWP). The Montreal [1] and Kyoto [2] Protocols, the subsequent amendments [3] and the consequent international and national laws and regulations deriving from them [4], have established very strict objectives aimed at a progressive reduction in greenhouse gases and in particular the gradual banning of HFCs [5][6][7][8][9][10], precisely because of their significant contribution to the greenhouse effect on our planet [11][12][13][14][15][16].…”

Section: Introduction 1generalitiesmentioning

confidence: 99%

Numerical Optimization of a Single Bunch of NiTi Wires to Be Placed in an Elastocaloric Experimental Device: Preliminary Results

et al. 2021

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Italy has not yet presented to the scientific community any elastocaloric prototype suitable for refrigeration/air conditioning. The SUSSTAINEBLE project was born from the idea to build a demonstrative elastocaloric prototype for environmental conditioning. The prototype is planned to be rotary and composed by a few bunches of elastocaloric wires crossed by air as heat transfer fluid. Many are the parameters to be investigated before the realization of the device. A numerical practical tool would help to easily optimize the prototype. In this paper a two-dimensional tool of a single bunch of elastocaloric wires based on finite-element method is introduced; it can reproduce step by step the velocity and the pressure field of fluid to predict more accurately the solid-to-fluid heat exchange. The results of a test campaign mostly focused on the optimization of the frequency of the cycle, fluid velocity and the distance between the elastocaloric wires are presented. The results reveal that: (i) 0.12 Hz as frequency; (ii) 7 m s−1 as velocity; (iii) 1.0 mm as optimal wire distance, would better satisfy the trade-off existing in the maximization of temperature span and cooling power per mass unit: 23.7 K and 311.97 W kg−1 are the values achieved, respectively.

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Comparative analysis of HFO-1234ze(E) and R-515B as low GWP alternatives to HFC-134a in moderately high temperature heat pumps

Cited by 36 publications

References 23 publications

Comparative Energetic, Exergetic, Environmental and Enviroeconomic Analysis of Vapour Compression Refrigeration Systems Using R515B as Substitute for R134a

Comparative Energetic, Exergetic, Environmental and Enviroeconomic Analysis of Vapour Compression Refrigeration Systems Using R515B as Substitute for R134a

Thermodynamic analysis of CO2 blends for vehicle heat pump at cold ambient temperature

Numerical Optimization of a Single Bunch of NiTi Wires to Be Placed in an Elastocaloric Experimental Device: Preliminary Results

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