Heat-supply three-layer casing system based on countercurrent heat exchange principle

Abstract

The invention provides a heat-supply three-layer casing system based on a countercurrent heat exchange principle. A thermal fluid flows through an inner pipe, a reflux cold fluid flows through an annular space between an inner pipe and an outer pipe, thermal insulating layers are wrapped on the outer walls of the inner and outer pipes, a layer of intermediate pipe is wrapped on the thermal insulating layer of the outer wall of the inner pipe so as to absorb the expansion of the inner pipe and the outer thermal insulating layer, and a certain gap is reserved between the intermediate pipe and the thermal insulating layer of the out wall of the inner pipe. The system provided by the invention can be used for overcoming the problems that the outer wall surfaces of the cold and heat pipes radiate heat to the surrounding medium in the traditional heat-supply process, the lost heat of the thermal fluid are all brought back by the cold fluid, and only the cold fluid radiates heat to the surrounding medium through the outer pipe; and the temperature gradient of the outer wall of a cold fluid pipe and the environment medium is smaller than that of the outer pipe wall of the thermal fluid and the environmental medium in the traditional mode, thus the heat dissipation with a larger temperature difference between a thermal fluid pipe wall and the environmental medium can be avoided and the heat-dissipating loss of a heat-supply pipeline can be greatly reduced.

Description

technical field [0001] The invention relates to a heat transfer and exchange device, in particular to a heat transfer three-layer casing system based on the principle of countercurrent heat exchange. Background technique [0002] In industrial and agricultural production and daily life, heating has a wide range of applications and is closely related to our production and life. Traditional heat transfer methods are mostly overhead pipelines or trench pipelines. The hot fluid pipeline and the return cold fluid pipeline are independent, only the outer walls of the respective pipelines are covered with insulation layers and exposed to the environment, but the temperature of the outer wall surface of the insulation layer of the hot and cold pipelines Still higher than the ambient temperature, the heat dissipation is larger, especially the heat dissipation of the heat pipe is larger, resulting in a large waste of heat. Contents of the invention [0003] The technical problem to...

AI Technical Summary

Problems solved by technology

Traditional heat transfer methods are mostly overhead pipelines or trench pipelines. The hot fluid pipeline and the return cold fluid pipeline are independent, only the outer walls of the respective pipelines are covered with insulation layers and exposed to the environment, but the temperature of the outer wall surface of the cold and hot pipeline insulation layer Still higher than the ambient temperature, the heat dissipation is relatively large, especially the heat dissipation of the heat pipe is greater, resulting in a lot of heat waste

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