Two-stage heat pipe type solar air heater

Abstract

The invention relates to a two-stage heat pipe type solar air heater which comprises a union heat pipe (1), a straight pipe type heat pipe (2) and a coated vacuum pipe (7). The straight pipe type heat pipe (2) is inserted in the coated vacuum pipe (7), and an annular metal internally-inserted fin (6) is inserted between an inner pipe of the coated vacuum pipe (7) and the straight pipe type heat pipe (2). The upper end of the coated vacuum pipe (7) is a union frame formed from a heat insulating layer (4) and an outer case (5), the outer case (5) wraps the heat insulating layer (4), and the evaporation section of the union heat pipe (1) is wrapped in the heat insulating layer (4). The condensation end of the union pipe is arranged in an air duct at the upper part of the union frame. The outer case (5), the heat insulating layer (4) and the evaporation section of the union heat pipe (1) are coaxial. A plurality of coated vacuum pipes (7) are arranged in parallel to receive solar irradiation and convert solar energy into heat energy, the straight pipe type heat pipe transfers heat to the evaporation end of the union heat pipe, the condensation end of the union heat pipe heats overflow air in the air duct, and thus, the integral two-stage heat pipe type solar air heater is formed.

Description

technical field [0001] The invention relates to a solar air heating device, in particular to a two-stage heat pipe type vacuum tube solar air heater. Background technique [0002] At present, the widely used solar air heaters are mainly flat-plate air heaters. In cold areas and cold seasons where the ambient temperature is low, due to the large heat loss of the flat-plate collectors, the thermal efficiency is low, and it cannot meet the needs of solar drying, etc. Hot air demand for applications with high temperature requirements. Researchers have tried to achieve higher temperature and high efficiency solar air heating through air collectors in the form of vacuum tubes, but the straight-through all-glass vacuum tube air heater has a high temperature of the glass inner tubes that receive solar radiation, resulting in glass inner tubes and The difference in glass expansion caused by the temperature difference of the outer tube is relatively large, which leads to the phenomen...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of existing solar air heaters such as large resistance, low efficiency, and low temperature of hot air, and provide a solar air heater with high heat absorption, heat exchange efficiency, long life, and low resistance

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