Double-hole concentric heat tube

Abstract

The invention discloses a double-hole concentric heat tube. The double-hole concentric heat tube mainly comprises an inner tube 1, an outer tube 2, positioning tenons 3 and a heat preserving layer 4. The inner tube 1 is supported by the positioning tenons 3 and fixed inside the outer tube 2, and the inner tube 1 and the outer tube 2 form a concentric circle and the single double-hole tube. The positioning tenons 3 are arranged at intervals, and every four tenons are evenly welded and distributed on the outer side of the inner tube 1 at 90 degrees. An annular channel between the inner tube 1 and the outer tube 2 forms an outer hole 6, and the outer hole 6 and an inner hole 5 jointly form the double-hole concentric heat tube and are equal in area. Compared with heat tubes paved in a double-tube paralleling mode in the prior art, the occupied width can be decreased, and a smallest net safety distance of underground pipelines is ensured. Earth volume required ditch excavation is decreased through direct burying pavement. The superficial area is smaller than that in the double-tube paralleling mode, heat energy consumption can be reduced, and energy is saved.

Description

technical field [0001] The invention relates to a double-hole concentric heat pipe, relates to a heat pipe network engineering, in particular to a pipe material of the heat pipe network. Background technique [0002] The media used in the urban heat pipe network mainly include steam and hot water. "Code for Design of Urban Heating Pipeline Network" (CJJ 34-2010) stipulates that "when the heat load of the production process is the main load and steam must be used for heating, steam should be used as the heating medium; when water is used as the heating medium When it can meet the needs of the production process (including converting to steam at the user's site), and the technology and economy are reasonable, water should be used as the heating medium." In the prior art, hot water is the main medium of the heat pipe network used for urban heating, ventilation, and air-conditioning heat load. After heat exchange, the user sends it back to the thermal power plant or regional h...

AI Technical Summary

Problems solved by technology

[0004] The medium temperature of the heat pipe is high. In order to reduce heat loss, an insulation layer needs to be installed. The thickness of the insulation layer is calculated according to the temperature of the medium in the pipe network and the ambient temperature. The greater the temperature difference between the two, the thicker the insulation layer is. layer, the greater the temperature difference between the medium and the environment, the greater the heat loss; the larger the surface area of ​​the pipe, the greater the heat loss, and the larger the surface area of ​​the double pipe, the greater the corresponding heat loss

Images