Abstract
A shell-and-tube heat exchanger which was subjected to different flow configurations, viz. counter flow, and parallel flow, was investigated. Each of the flow configurations was operated under two different conditions of the shell, that is, an uninsulated shell and a shell insulated with fiber glass. The hot water inlet temperature of the tube was reduced gradually from 60 oC to 40 oC, and performance evaluation of the heat exchanger was carried out. It was found that for the uninsulated shell, the heat transfer effectiveness for hot water inlet temperature of 60, 55, 50, 45, and 40 oC are 0.243, 0.244, 0.240, 0.240, and 0.247, respectively, for the parallel flow arrangement. For the counter flow arrangement, the heat transfer effectiveness for the uninsulated shell are 2.40, 2.74, 5.00, 4.17, and 2.70%, respectively, higher than those for the parallel flow. The heat exchanger’s heat transfer effectiveness with fiber-glass-insulated shell for the parallel flow condition with tube hot water inlet temperatures of 60, 55, 50, 45, and 40 oC are 0.223, 0.226, 0.220, 0.225, and 0.227, respectively, whereas the counter flow condition has its heat transfer effectiveness increased by 1.28, 1.47, 1.82, 1.11, and 1.18%, respectively, over those of the parallel flow.
Highlights
A system whose purpose is to transfer heat energy from one fluid to another fluid of different currents at different temperature by means of varieties of utilities, resulting in heating or cooling of the processed current is known as a heat exchanger [1], [2]
The results indicated that staggered single segmental baffle (SSSB), flower segmental baffle (FSB), and hybrid segmental baffle (HSB) configurations have a significant improvement on the performance of the heat exchanger, and that the effect of HSB configuration on the performance of the heat exchanger was the highest of all test configurations considered
The experiments were executed with the shell-and-tube heat exchanger for parallel and counter flow configurations
Summary
A system whose purpose is to transfer heat energy from one fluid (liquid and/or gas) to another fluid of different currents at different temperature by means of varieties of utilities, resulting in heating or cooling of the processed current is known as a heat exchanger [1], [2]. The thermo-hydraulic characteristics of their shell sides were studied numerically, and the fluid velocity effects, as well as the geometry of baffle, on their performance were investigated It was known, through the results of the investigation, that HCB-STHX, being higher in rigidity than RRB-STHX, would be more appropriate in applications that require tube bundle of large size and heavy weight. The results of the analysis showed that the R227ea and R123 had the lowest thermal efficiency of 15–21% and highest thermal efficiency of 17–23% It can be observed from the previous works mentioned above that attempt has not been made to investigate the shell-and-tube heat exchanger performance in which the fluid inlet temperature of the tube of the heat exchanger is varied, while the fluid inlet temperature of its shell is not varied.
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