Solar phase-change heat collecting and storing tube

Abstract

The invention relates to a solar phase-change heat collecting and storing tube, which comprises a solar vacuum heat collecting tube, a heat exchange tube, a phase-change material, a phase-change heat accumulator and a draft tube. The phase-change heat accumulator is arranged in the solar vacuum heat collecting tube; the heat exchange tube is embedded in the phase-change heat accumulator, and the upper part of the heat exchange tube is slidably connected with the phase-change heat accumulator; the phase-change material is filled between the phase-change heat accumulator and the heat exchange tube; and the draft tube is inserted into the heat exchange tube. In the solar phase-change heat collecting and storing tube, the fastening end cover of the phase-change heat accumulator is provided with sealing grease, so the heat exchange tube is slidably connected with the phase-change heat accumulator; when the phase-change material is overheated, high pressure in the tube body of the phase-change heat accumulator can push the heat exchange tube to move outwards to release high pressure so as to complete overheated unloading, so the safety performance when the heat collecting tube is overheated is greatly improved and the phase-change material is ensured not to be overheated.

Description

technical field [0001] The invention relates to a solar heat collection tube, in particular to a solar phase change heat collection and heat storage tube. Background technique [0002] A prior art all-glass vacuum heat collecting tube usually includes two transparent glass blind tubes that are mutually socketed in the same direction. The inner and outer glass blind tubes are welded to each other at the opening ends. There is a vacuum chamber between the two glass blind tubes. The metal tube coated with solar heat absorbing film can be installed in the glass blind tube. The all-glass vacuum heat collecting tube is low in cost, but has a large heat capacity, slow thermal start-up, and poor reliability. [0003] Another prior art flat-plate heat collector has good performance and high reliability, but because a secondary circuit is used for anti-freezing, the cost is high, the installation requirements are high, and the utilization rate of heat energy is low. [0004] Another...

AI Technical Summary

Problems solved by technology

All-glass vacuum heat collectors are low in cost, but have large heat capacity, slow thermal start-up, and poor reliability

[0003] Another prior art flat-plate heat collector has good performance and high reliability, but because the anti-freezing needs to adopt a secondary circuit, the cost is high, the installation requirements are high, and the heat energy utilization rate is low

[0004] Another prior art is the "phase-change solar heat collection device" disclosed in Chinese patent ZL 02227528.2. The heat collection device includes a heat collector, a phase-change material directly stored in the heat Thermal device, the disadvantage of this phase-change solar heat collector is that when the phase-change material is overheated, the high pressure in the heat collector tube cannot be released, and can only be accumulated in the tube, which brings safety hazards

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