Performance comparison of low GWP refrigerants for a miniature vapor compression system integrated with enhanced phase change material

Dhumane, Rohit; Ling, Jiazhen; Aute, Vikrant; Radermacher, Reinhard

doi:10.1016/j.applthermaleng.2020.116160

Cited by 7 publications

(8 citation statements)

References 27 publications

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“…Overall, they found that fluid ranking within the simple cycle is similar to experimental results presented within the literature. [ 22,24,28 ]…”

Section: Resultsmentioning

confidence: 99%

“…However, current refrigerant assessment and selection methods usually only consider a fixed flowsheet, one case for the heat source and sink conditions, or constant compressor efficiencies. [25][26][27][28][29][30] Only a few studies cover the influence of the flowsheet [8,16,[31][32][33][34][35] or the conditions of heat sources and sinks. [22][23][24]36] Beyond the standard approach of constant compressor efficiencies, sometimes simple empirical compressor models were used.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the Interactions between Refrigerant, Flowsheet, and Compressor in Residential Heat Pumps

et al. 2023

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The refrigerant used in heat pumps significantly influences the overall system performance. However, selecting a proper refrigerant is no trivial matter due to the heat pumps’ sensitivity to the selected flowsheet, components, and operating conditions. Herein, a holistic approach is used that covers all these interdependencies simultaneously considering the flowsheet, fluid‐dependent compressor efficiencies, and the operating point. Six low global warming potential (GWP<150) refrigerants are investigated, which include pure fluids, azeotropic mixtures, and zeotropic mixtures from different substance groups. For four flowsheets, the seasonal coefficient of performance (SCOP) by EN 14825 is calculated and serves as the assessment metric. The case study is based on typical conditions of residential heat pumps. The results show that the SCOPs substantially differ depending on the refrigerant and the flowsheet (reaching from 3.8 to 4.6). Differences in the performance of refrigerants for an equal flowsheet are mainly driven by compressor efficiency. However, these differences can be overcome by adjusting the flowsheet. In particular, when an internal heat exchanger is added, the refrigerant ranking is substantially changed. It is shown that R436A, which is inferior to R290 for the basic cycle, benefits more from an internal heat exchanger and reaches a competitive SCOP than R290.

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“…Overall, they found that fluid ranking within the simple cycle is similar to experimental results presented within the literature. [ 22,24,28 ]…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of the Interactions between Refrigerant, Flowsheet, and Compressor in Residential Heat Pumps

et al. 2023

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“…In this model, a Rotary‐screw compressor with specific characteristics in Table 1 was applied. The compressor efficiency varies with the ratio of inlet and outlet pressure, and the refrigerant type 24 . In this study, an efficiency model based on the isentropic, volumetric, and motor efficiency is applied, and thermal losses from the screw compressor have been ignored 24 .…”

Section: Methodology and Assumptionsmentioning

confidence: 99%

“…The compressor efficiency varies with the ratio of inlet and outlet pressure, and the refrigerant type 24 . In this study, an efficiency model based on the isentropic, volumetric, and motor efficiency is applied, and thermal losses from the screw compressor have been ignored 24 . Refrigerant enters the compressor at point 5 and exits it at point 6, and with these regards, power consumption of the compressor, the mass flow rate of the refrigerant, and COP can be calculated by the following relations 34 :

S_{6 . italicis} = S_{5}

h_{6} = h_{5} + \frac{h_{6 . italicis} - h_{5}}{η_{italicis}}

η_{is} = 0.85 - 0.046667 ((), \frac{P_{6}}{P_{5}})

…”

Section: Methodology and Assumptionsmentioning

confidence: 99%

“…Their findings also led to an optimum water flow rate for specific charging times. Dhumane et al 24 introduced a novel vapor compression cooling system, and they used a microchannel heat exchanger as the evaporator integrated with some kinds of PCM composite containing graphite. They evaluated the impacts of different refrigerant fluids such as R32, R1234yf, R1234ze(E), and R290, and their coefficient of performance (COP) results indicated the variation between −12% and 8% compared to regular cooling systems.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of a cooling system integrated with different phase change material s and its effect on peak load shaving

et al. 2021

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Summary In this study, a vapor‐compression cooling system utilizing different phase change materials (PCMs) has been studied whereby the electricity consumption peak load is shifted. More specifically, the dynamic performance of cooling systems with and without using PCM is evaluated for the hottest day of the year. The proposed system uses the cooling energy to freeze, or “discharge” the PCM during nighttime when the cooling load is minimally needed and uses the stored thermal energy during the peak load hours by melting, or “charging” the PCM. This leads to better performance during peak load hours when higher cooling loads are needed. Different PCMs including oleic acid, SP224A, CL, CaCl2·6H2O have been investigated. The system performance has been investigated by considering several parameters such as coefficient of performance, compressor power consumption, accessible cooling load, and melting fraction of PCM. The effect of different volumes of PCM on the average cooling cost has been evaluated, as well. The results indicated that with using the PCM, the accessible cooling load raises and the electricity consumption falls during hours of the peak load. Peak load reduction in the on‐peak period is different for various PCMs. In comparison with the conventional cooling system, the peak load alters from 315 W to 170, 164, 93, and 74 W for CL, oleic acid, CaCl2·6H2O, and SP224A, respectively. The evaluation of different PCM illustrated that for the volume of 150 L, the peak load shaving for SP224A is the most value which is 76.3%. Moreover, while the volume of different PCMs increases, the average price of the cooling energy decreases, and the Levelized cost of cooling energy rises.

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Performance improvement of vapour compression refrigeration system using phase change material and thermoelectric generator

Nandanwar¹,

Walke²,

Kalbande³

et al. 2023

International Journal of Thermofluids

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Performance comparison of low GWP refrigerants for a miniature vapor compression system integrated with enhanced phase change material

Cited by 7 publications

References 27 publications

Investigation of the Interactions between Refrigerant, Flowsheet, and Compressor in Residential Heat Pumps

Investigation of the Interactions between Refrigerant, Flowsheet, and Compressor in Residential Heat Pumps

Evaluation of a cooling system integrated with different phase change material s and its effect on peak load shaving

Performance improvement of vapour compression refrigeration system using phase change material and thermoelectric generator

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