High-efficiency evaporation and condensation casing heat exchanger

Abstract

The invention discloses a highly effective heat exchanger of evaporation-condensation sheathed tube type, which comprises two tubes with different diameters; an inner tube adopts an externally-finned nickel brass tube or a copper tube, and the two tubes are able to transmit heat by enforcement; an outer tube adopts a smooth cooper tube or a steel tube; the small section of a capillary tube is padded between the inner tube and the outer tube at different positions along length direction and on different angles along circumferential direction; when the sheathed tube is bent into serpentine tubes with different diameters according to the requirements; the capillary tube on the inner tube has a function of supporting the outer tube; two ends of the inner tube and the outer tube are welded. The highly effective heat exchanger of the invention is characterized by simple process, small resistance of refrigerant and water side, overcoming the defect of the existing sheathed tube type heat exchanger being unable to have both good condensing heat exchange effect and evaporating heat exchange effect, realizing the enforcement of condensing heat exchange as well as evaporating heat exchange, thus meeting the double high efficiency requirement of condensation and evaporation heat exchange of a sheathed tube type heat exchanger for a small-sized air-water air-conditioning heat pump unit.

Description

technical field [0001] The invention relates to a heat exchanger, in particular to a high-efficiency casing heat exchanger for condensation and evaporation heat exchange. Background technique [0002] The air-water heat pump unit is the most commonly used heat pump unit for air conditioning. There are two heat exchangers in this heat pump work, and the work of one of the heat exchangers is the evaporation and condensation exchange between the refrigerant and the water. hot. There are three main types of this heat exchanger: shell and tube, plate and casing, among which the casing heat exchanger is used for air-water heat pump units with small capacity. The inner tubes of commonly used sleeve-and-tube heat exchangers are several light tubes with small diameters, and their heat transfer performance is relatively low, mainly relying on increasing the heat transfer area to increase the heat transfer, which results in large flow resistance on the water side, and It is not easy ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing casing heat exchanger has large water side flow resistance due to its internal structure, is not easy to clean, and has poor evaporation heat transfer effect, especially in low water temperature. Low, need electric heating to compensate, increase energy consumption and other disadvantages

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