Refrigerant maldistribution in brazed plate heat exchanger evaporators. Part B: Analysis of the influence of maldistribution on the evaporator performance

Navarro-Peris, Emilio; Alvarez-Piñeiro, Lucas; Schnabel, Lena; Corberán, José M.

doi:10.1016/j.ijrefrig.2021.04.003

Cited by 13 publications

(3 citation statements)

References 14 publications

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“…If the number of channels in the plate heat exchanger is small, the end-plate acts as a fin and causes heat loss, and the effect is that the number of channels increases, the effect weakens accordingly. Navarro-Peris et al [24,25] confirmed the non-uniform heat distribution of a brazed plate heat exchanger for an evaporator with a thermal imaging camera. It was confirmed that the evaporation temperature decreased, and a significant portion of the liquid was accumulated in the end channel of the evaporator, which was caused by poor refrigerant distribution.…”

Section: Introductionmentioning

confidence: 96%

“…Studies on the non-uniformity of flow distribution in plate heat exchangers have mainly been indirectly verified by measuring the temperature distribution in the outer channel through a thermal imaging camera [23][24][25], and it was investigated by flow maldistribution parameter [26,27], a parameter based on the friction coefficient of the port and channel shape. Jin and Hrnjak [23] investigated the effect of the heat transfer plate at the end of the plate heat exchanger.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study on Non-Uniform Temperature Distribution and Thermal Performance of Plate Heat Exchanger

Ham

Lee

et al. 2021

Energies

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In this study, computational fluid dynamics (CFD) analysis was performed to investigate the cause of the thermal stratification in the channel and the temperature non-uniformity of the plate heat exchanger. The flow velocity maldistribution of the channel and the merging parts caused temperature non-uniformity in the channel width direction. The non-uniformity of flow velocity and temperature in the channel is shown in Section 1 > Section 3 > Section 2 from the heat exchanger. The non-uniform temperature distribution in the channel caused channel stratification and non-uniform outlet temperature. Stratification occurred at the channel near the merging due to the flow rate non-uniformity in the channel. In particular, as the mass flow rate increased from 0.03 to 0.12 kg/s and the effectiveness increased from 0.436 to 0.615, the cold-side stratified volume decreased from 4.06 to 3.7 cm3, and the temperature difference between the stratified area and the outlet decreased from 1.21K to 0.61K. The increase in mass flow and the decrease in temperature difference between the cold and hot sides alleviated the non-uniformity of the outlet temperature due to the increase in effectiveness. Besides, as the inlet temperature difference between the cold and the hot side increases, the temperature non-uniformity at the outlet port is poor due to the increase in the stratified region at the channel, and the distance to obtain a uniform temperature in the outlet pipe increases as the temperature at the hot side increases.

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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Numerical Study on Non-Uniform Temperature Distribution and Thermal Performance of Plate Heat Exchanger

Ham

Lee

et al. 2021

Energies

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“…Charge-reduced refrigerant cycles and heat pumps are under research for several years [2][3][4][5][6][7][8][9][10][11][12][13]. From this literature the most relevant aspects for charge reduction were identified and continued with an extensive experimental and simulation-based screening of components and cycles to improve design rules and accuracy in prediction.…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of Charge‐Reduced Refrigerant Cycles Using R290

Schnabel

Methler

Hassan

et al. 2023

Chemie Ingenieur Technik

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R290 is one of the most promising refrigerants for heat pumps and cooling processes working in a temperature range of -15 to 70 °C. The nearly neglectable global warming potential and attractive thermodynamic properties allow the design of climate-friendly and efficient refrigeration systems and heat pumps. However, R290 is flammable, and the use of charge-reduced components and designs should be the first central step to reduce safety risks. Whereas the prediction of heat capacity, temperatures and pressure drops are sufficiently precise the prediction of refrigerant charge is not very accurate when using computer-aided design tools. The article presents a method to enhance accuracy for refrigerant cycles with less than 500 g of R290.

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Evaluation of plate heat exchangers comprising sections with different chevron angle arrangements

dos Santos,

Silva,

de Paiva

et al. 2024

Applied Thermal Engineering

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Refrigerant maldistribution in brazed plate heat exchanger evaporators. Part B: Analysis of the influence of maldistribution on the evaporator performance

Cited by 13 publications

References 14 publications

Numerical Study on Non-Uniform Temperature Distribution and Thermal Performance of Plate Heat Exchanger

Numerical Study on Non-Uniform Temperature Distribution and Thermal Performance of Plate Heat Exchanger

Design and Analysis of Charge‐Reduced Refrigerant Cycles Using R290

Evaluation of plate heat exchangers comprising sections with different chevron angle arrangements

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