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Abstract: This paper introduces asymmetric plate Heat exchanger The structural features, performance and heat transfer in air-conditioning engineering advantages. Introduction Plate heat exchanger as an energy efficient heat exchange equipment in the city focus Heating Indirect project, focus or continuous heating, played to save energy and equipment maintenance and management costs, protect the environment, to ensure an important role in people's lives to live and work, is indispensable urban central heating equipment. In recent years, with the scale of urban central heating continues to expand, its operational characteristics of hot and cold side of the media mostly flow or temperature range, typically 2:1 ¯ 3:1, especially the air conditioning heat exchangers, the typical condition for the first time the water temperature is 95 70 , the second water temperature 50 60 or 55 60 , temperature or flow ratio up to 2.5 ¯ 5, for such non-symmetrical conditions, several of China major heat exchanger manufacturers have developed a non-symmetric plate heat exchanger, is introduced the situation. Structural features 1. Two-fluid flow through the plate hole size of the different angle. Large flow of fluid away horn hole, low flow, flow of small-angle hole, two-fluid flows through the receiver and the angle of the hole is similar to resistance loss. 2. Diversion area was non-symmetrical structure, that is, large and small side fluid flow channel geometry is different from low flow side channel of the width of the high flow side than the narrow channel width, flow depth is more than big flow side of the light, the total length of the channel is longer than the high flow side. Thus, on both sides of the diversion plate area of great non-symmetry, can the two fluid pressure drop along the diversion area is more balanced along the plate in the distribution of more uniform. 3. Heat transfer area on both sides of the respective flow ranges from the cross-sectional area (sectional area ratio of 2:1 or greater), different size and shape of the chevron corrugated structure, shown in Figure 2. An obtuse angle ripple can also be an acute angle; as the two cross-sectional area of fluid flow range, fluid flow when the two ranges, the two fluids can flow close to or equal to cubicle. Thus, the greatly increased flow of small side heat transfer coefficient, thus greatly improving the overall heat transfer coefficient, intensity of heat, saving heat transfer area. 4. Only the same plate (1 set of mold) with special sealing structure, the composition of heat transfer performance can be a reasonable match with the pressure drop of two flow channel, flow characteristics of the unilateral flow; than conventional in two plate (two sets of mold) to achieve non-symmetrical flow, greatly saving mold investment and production costs. 5. The general layout of a single process, took over both the fixed compression plate at the side of easy installation and maintenance. Works We all know, the plate heat exchanger, the board only when the two fluid flow close to the time between the best performance. However, flow rate or temperature conditions than the greater than 2, if the plate heat exchanger used symmetrical arrangement of a single process, because flow rate ranging between two-fluid flow rate ranging from board, so there is always the side to allow the fluid pressure drop can not be fully utilized, the low velocity side of the cubicle, to the thermal coefficient of low, easy to scale; flow rate of the high side pressure drop is often too large, making long sheet to withstand high pressure and deformation. So both sides of plate heat transfer fluid can not be at its best. If the low flow side of the multi-flow arrangements, so that the two fluid flow close to the cubicle. This first heat transfer performance degradation (due to existence of downstream), resulting in heat transfer area is too large, unnecessary waste; second board are arranged over two compression, inconvenience to the operator maintenance. Non-symmetric plate heat exchanger plate of the corner holes as diversion areas and the heat transfer area structures are asymmetric, two-fluid flow can be varied in time, so partitioned flow (or pressure drop) is still close to or equal. Thus, the greatly increased flow of small side heat transfer coefficient, thus greatly improving the overall heat transfer coefficient, enhanced heat transfer performance, reduce the heat transfer area. Related topics: Create new industry standards for total lead, then a new era of heating radiator Related Reading: Ethylbenzene tube to tube sheet heat exchanger cracking analysis (Photos) Of a new heat exchanger technology research and application of 09 in the first quarter exports of Jiangsu Jiangyin Heat contrarian high growth We are high quality suppliers, our products such as Wear Resistant Casting , Heat Resistant Castings for oversee buyer. To know more, please visits White Iron Castings.
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