U-shaped tube type heat exchanger

Abstract

The invention relates to a U-shaped tube type heat exchanger which belongs to the technical field of solar energy heat utilization. The U-shaped tube type heat exchanger comprises a heat collection tube and is characterized by being provided with a U-shaped tube bundle and a runner chamber, wherein the U-shaped tube bundle and the runner chamber are combined into a whole and arranged in the heat collection tube; the runner chamber and the heat collection tube are sealed by a high-temperature resistant silica gel ring; the U-shaped tube bundle is formed by longitudinally arranging a plurality of parallel through holes on alloy, and one end of every two tubes is welded form a U-shaped tube elbow to form a plurality of sets of U-shaped tubes; the runner chamber consists of a tube nest with through holes and an end cover, and a cavity is formed between the tube nest and the end cover; the middle part of the cavity is provided with a partition board which divides the cavity into two chambers; and an inlet and outlet of the U-shaped tube bundle are welded in the through holes of the tube nest and communicated with the two cavities. The invention has compact and reasonable structure, high heat exchange efficiency, reliable sealing, long service life and easy production and manufacture and is not only suitable for a hot water system of a single family, but also suitable for a large-area solar hot water system requiring high pressure.

Description

technical field [0001] The invention relates to a tube-and-tube heat exchanger, in particular to a structure of a U-shaped tube bundle heat exchanger built in an all-glass vacuum solar heat collection tube, and belongs to the technical field of solar heat utilization. technical background [0002] The existing U-shaped tube type is to exchange heat with a single U-shaped copper tube built in the heat collecting tube. Due to the small diameter of this single U-shaped copper tube, it directly participates in the fluid convection heat transfer. The tube wall area, that is, the heat transfer area is small. According to The principle of heat transfer, under the same sunlight irradiation, the heat transfer area is small, and the thermal efficiency is low. [0003] The existing U-shaped tube type is used by combining multiple series in series to form a unit heat-collecting block, and the connection between adjacent U-shaped tubes needs to be integrally welded into a unit heat-colle...

AI Technical Summary

Problems solved by technology

as in Take the unit heat collector block composed of branch heat collector tubes as an example, its length is 1.8m, and its transverse width is 1.597m. Such a large area has poor rigidity, so it needs to be bundled up for transportation as a whole. This situation brings great difficulties to transportation, installation and maintenance. very difficult

Obviously the existing U-shaped tube can not really meet the needs of the market

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