An experimentally validated evaporative phase change heat transfer model for low mass flux applications using R134a in plate heat exchangers

Simon, III, John R.; Bandhauer, Todd M.

doi:10.1016/j.ijrefrig.2021.08.003

Title: An experimentally validated evaporative phase change heat transfer model for low mass flux applications using R134a in plate heat exchangers

Journal Article · Tue Aug 10 00:00:00 EDT 2021 · International Journal of Refrigeration

DOI:https://doi.org/10.1016/j.ijrefrig.2021.08.003· OSTI ID:1977216

Simon, III, John R. ^[1]; Bandhauer, Todd M. ^[1]

Colorado State Univ., Fort Collins, CO (United States)

Plate frame heat exchangers are common in liquid-coupled vapor compression systems due to their compactness and ease of maintenance. In some of these systems, the refrigerant within the evaporator can enter the heat exchanger as a subcooled liquid. As a result, the refrigerant passes through three different phases: single-phase liquid, two-phase fluid, and a superheated vapor. Unfortunately, there have been limited prior studies that have identified the best method to predict performance under these circumstances. Furthermore, previous investigations have not evaluated refrigerant evaporation in large industrial sized plate frame heat exchangers under conditions experienced in the present study experimental test facility, especially at mass fluxes below 7 kg m^–2 s^–1. In the present investigation, a model was developed to predict the performance of plate and frame heat exchangers when the fluid enters as a subcooled liquid and exits as a superheated vapor. The model used full-sized plate heat exchanger geometry that was discretized into 20 sections to accurately capture local heat transfer and pressure drop effects. The model was validated using an R134a counter flow heat exchanger used in a turbo-compression cooling system test facility that had subcooled liquid entering the evaporator at low mass fluxes. A variety of empirical correlations were evaluated to determine what combination yielded the best predictive capability over the following range of conditions: 5.8 < G < 6.8 kg m^–2 s^–1, 2 < q” < 2.8 kW m^–2, and 10 °C < T_sat < 15 °C. When the correlations used a fixed control volume length in the heat flux calculation, the most accurate combination resulted in a mean absolute error of 5.5%. Finally, future studies can use the approach described here to optimize heat exchanger size and performance.

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Research Organization:: Colorado State Univ., Fort Collins, CO (United States)

Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: AR0000574

OSTI ID:: 1977216

Journal Information:: International Journal of Refrigeration, Vol. 131, Issue C; ISSN 0140-7007

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Thermodynamics
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Title: An experimentally validated evaporative phase change heat transfer model for low mass flux applications using R134a in plate heat exchangers

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