Performance Evaluation of Plate Heat Exchanger with Chevron Angle Variations

Abstract

The objectives of this paper are to measure the heat transfer and pressure drop of the plate heat exchangers for absorption system applications. Three types of plate heat exchangers with different chevron angles are tested in the present experiment. Heat transfer and pressure drop performance of plate heat exchangers are measured in various operating conditions, and compared each other. The results show that the heat transfer rate of high theta (120°) and mixed theta plate heat exchanger increases about 118% and 98% at the solution flow rate 350 kg/h compared to that of low theta (60°), respectively. The effectiveness of high theta was evaluated about 0.53~0.85 in this experimental range. The experimental correlations of the Nu and f were developed with error bands of ±7% and ±12%.

Experimental Investigation of the Heat Transfer Characteristics of Plate Heat Exchangers Using LiBr/Water as Working Fluid

“…However, to the best of our knowledge, no extant study has investigated the difference, and it is therefore considered useful to examine the difference through this study. When the existing correlations based on LiBr/LiBr were compared with the LiBr/water results of this study, Kwon et al [19] exhibited large errors of less than 60%, Song et al [21] less than 30%, and Kim et al [18] less than 50%. While Kim et al [18] and Song et al [21] showed tendencies similar to that of this study, despite the large errors in Nu, Kwon et al [19] exhibited a significantly different increasing tendency for Nu compared to the results of this study.…”

“…When the existing correlations based on LiBr/LiBr were compared with the LiBr/water results of this study, Kwon et al [19] exhibited large errors of less than 60%, Song et al [21] less than 30%, and Kim et al [18] less than 50%. While Kim et al [18] and Song et al [21] showed tendencies similar to that of this study, despite the large errors in Nu, Kwon et al [19] exhibited a significantly different increasing tendency for Nu compared to the results of this study. These differences occurred because experiments were performed at higher inlet temperatures in the previous studies compared to this study, and the previous studies had lower Nu results at similar Re levels as they had lower Prandtl numbers (Pr).…”

“…Kim et al [18] analyzed the heat transfer and pressure drop according to the chevron angles of 30 • , 45 • , and 63 • , and found that the heat transfer performance increased alongside the increase in chevron angle. Kwon et al [19] investigated the influence of various chevron angles (60 • , 120 • , and mixed type) of a solution heat exchanger on the heat transfer and pressure drop. Based on the experiment results obtained, they proposed a Nu and friction coefficient correlation according to the chevron angle.…”

“…The aforedescribed studies [10][11][12][13][14][15] were experimental studies on water/water in PHEs, and previous studies on LiBr/LiBr [17][18][19][20][21] mostly analyzed heat transfer characteristics and developed Nu correlations according to the experimental conditions. However, the water/LiBr condition of heat transfer characteristics analysis in the falling file type generator [22][23][24], which is a component of the absorption system, has been variously conducted, but studies related to water/LiBr in the simple plate heat exchanger (brazed type and gasket type plate heat exchanger) are insufficient.…”

Experimental Study on Heat Transfer and Pressure Drop Characteristics for Welded Embossing Type Plate Heat Exchangers

“…They carried out both the numerical analysis and the experiments and found that the elliptic embossing type gave better heat transfer performance than the chevron type plate and a lower pressure drop than the other plates under the same geometric and thermal conditions. Kwon et al 7 carried out experiments for the high temperature solution heat exchanger. They evaluated the heat transfer and pressure drop characteristics by changing the chevron angle and derived a Nusselt number and friction factor correlation.…”