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• W2978780824 abstract "ABSTRACTAnalysis to measure the condensation heat transfer coefficient and the pressure drop in brazed plate heat exchangers (BPHEs) were conducted with the refrigerants R134a. Brazed plate heat exchangers with different chevron angles of 45°, 35°, and 20° were used. Changing the mass flux, the condensation temperature, and the vapour quality of the refrigerant, the condensation heat transfer coefficient and the pressure drops were measured. Both the heat transfer coefficient and the pressure drop increased proportionally with the mass flux and the vapour quality and inversely with the condensation temperature and the chevron angle. Correlations of the Nusselt number and the friction factor with the geometric parameters are suggested for the tested BPHEs.Keywords: Condensation, Brazed plate heat exchanger, R134a, Chevron angle.(ProQuest: ... denotes formulae omitted.)INTRODUCTION:Plate heat exchangers (PHEs) were introduced in the 1930s and were almost exclusively used as liquid/liquid heat exchangers in the food industries because of their ease of cleaning. Over the years, the development of the PHE has generally continued towards larger capacity, as well as higher working temperature and pressure. Recently, a gasket sealing was replaced by a brazed material, and each thermal plate was formed with a series of corrugations (herringbone or chevron). These greatly increased the pressure and the temperature capabilities. The corrugated pattern on the thermal plate induces a highly turbulent fluid flow. The high turbulence in the PHE leads to an enhanced heat transfer, to a low fouling rate, and to a reduced heat transfer area. Therefore, PHEs can be used as alternatives to shell-and-tube heat exchangers. Due to ozone depletion, the refrigerant R22 is being replaced by R134a (a binary mixture of R32 and R125, mass fraction 50 %/50 %). R134a approximates an azeotropic behaviour since it can be regarded as a pure substance because of the negligible temperature gliding. The heat transfer and the pressure drop characteristics in PHEs are related to the hydraulic diameter, the increased heat transfer area, the number of the flow channels, and the profile of the corrugation waviness, such as the inclination angle, the corrugation amplitude, and the corrugation wavelength. These geometric factors influence the separation, the boundary layer, and the vortex or swirl flow generation. However, earlier experimental and numerical works were restricted to a single-phase flow. Since the advent of a Brazed PHE (BPHE) in the 1990s, studies of the condensation and/or evaporation heat transfer have focused on their applications in refrigerating and air conditioning systems, but only a few studies have been done. Much work is needed to understand the features of the two-phase flow in the BPHEs with alternative refrigerants. Xiaoyang et al. [1] experimented with the two-phase flow distribution in stacked PHEs at both vertical upward and downward flow orientations. They indicated that non-uniform distributions were found and that the flow distribution was strongly affected by the total inlet flow rate, the vapour quality, the flow channel orientation, and the geometry of the inlet port.Holger [2] theoretically predicted the performance of chevron-type PHEs under single-phase conditions and recommended the correlations for the friction factors and heat transfer coefficients as functions of the corrugation chevron angles. Lee et al. [3] investigated the characteristics of the evaporation heat transfer and pressure drop in BPHEs with R404A and R407C. Kedzierski [4] reported the effect of inclination on the performance of a BPHE using R22 in both the condenser and the evaporator. Several single-phase correlations for heat transfer coefficients and friction factors have been proposed, but few correlations for the two-phase flow have been proposed. Yan et al. [5] suggested a correlation of condensation with a chevron angle of 30o for R134a. …" @default.
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• W2978780824 date "2013-07-01" @default.
• W2978780824 modified "2023-09-22" @default.
• W2978780824 title "Performance Analysis for Plate Heat Exchanger with Various Chevron Angles Using R134a as a Refrigerant" @default.
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