Abstract
Conventional circular double or triple tube type heat exchanger, DHE or THE, is one of the compact heat exchangers; a large number of studies have been performed to improve their heat transfer performance. The authors demonstrated that a petal-shaped special DHE with a large wet perimeter yields a high heat transfer efficiency, η. In this study, the DHE with six or five petals-, five shallow petals-, and circular-inner tubes were used. To further improve the η of the DHE, a THE with a petal-shaped inner tube along with the middle and outer circular tubes were used. Hot water flowed through the inner tube and cold water flowed through the middle and outer tubes as a counter current flow. The heat transfer was approximately equal; however, the flow resistance (pressure loss) of the outer tube of the DHE could be decreased using the middle and outer tubes under the same amount of cold water as the DHE; consequently, the η could be improved. In addition, the effect of changing the flow path of the hot- and cold-water flows on the η was examined.
Highlights
From the viewpoint of energy and resource reductions improvement in the heat transfer performance, h.t.p., of heat exchangers is required
Hot water of approximately 60 ◦ C flowed through the inner tube and cold water of approximately
We examine the heat transfer efficiency, η when heat transfer is Q’ = 2.0
Summary
From the viewpoint of energy and resource reductions improvement in the heat transfer performance, h.t.p., of heat exchangers is required. A heat exchanger is generally a device to transfer thermal energy from hot fluid to cold fluid and many types exist for different practical applications. Many things have become clear, and recently, there have been few studies on them except for special ones. General circular double and triple tube heat exchangers, CP-tube and CP-tri-tube, are widely used as a condenser, vaporizer, sub-cooler, heat recovery exchanger, crystallizer, etc. Many studies to improve the h.t.p. of double tube heat exchangers have been performed; for example, by using a non-circular tube instead of circular inner tube or by inserting a twisted tape in the tube [3,4,5,6]
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