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Water Source Heat Pump Air Conditioning System Led Low Energy Times Sep 27, 2016

Russia proposed an advanced method, namely pneumatic spraying method to improve the performance of the finned surface. Its essence is using high-speed cold or slightly heated fluids containing particles to the finned surface spraying of powder particles. Using this method can not only be sprayed metal sprayed alloy and ceramic (metal ceramic composites), resulting in a variety of different surfaces. Usually at the end of practice fin surface contact resistance is one of the factors that limit pipe installed fin. Experimental study on the assessment of fin-and-tube heat exchanger element. AC-test is used on the fin surface spraying aluminum and alumina added 24A white electric furnace. Test data, organize them, can assess contact resistance of the bottom surface of the fin. Study on fin efficiency and data compare, and came to the conclusion that: the contact resistance of pneumatic spraying the underside of the fin will have no substantial impact on efficiency. In order to confirm this, and base (pipe) and surface (FIN) structure analysis of transition zones.


Analysis of the specimens in the transitional area shows, connect all strictness of micro-cracks on the entire length of the border. Therefore, air spray method for surface and formation of the basic branches of the interaction boundary, can promote the powder particles penetrate to the substrate, which shows high adhesive strength, physical contact and metal chain. Pneumatic spray can be used, can also be used as ordinary production fixed in fin tubes of the heat exchanger on the surface, can also be used to complement conventional fins on the underside for reinforcement. It would be expected that pneumatic spraying method in the production of compact high efficiency heat exchanger will be widely applied. Heat exchanger with helical baffles


In shell-and-tube heat exchangers, shell is usually a weak point. Usually common segmental baffles can cause twists and turns of the flow system (z-shaped flow channel), this will result in a larger corner and high dispersion. These corners caused shell side fouling, bad for the heat transfer efficiency. Mixing can also distort the average temperature difference between in and out. The consequence is that compared with plug flow, segmental baffles will reduce the net heat transfer. Superior segmental baffles of shell and tube heat exchanger can hardly meet the requirement of high efficiency, it is often replaced with other types of heat exchangers (compact heat exchanger). To the general improvement of baffle plate geometry, the first step is the development of the shell. Although the introduction of the seal Strip and attach such as transition plates and taking other measures to improve the performance of the heat exchanger, but the main drawback of ordinary baffle design still exists.