A solar vacuum heat collection tube and system close to countercurrent heat exchange effect

Abstract

The invention provides a solar vacuum heat collection pipe having the approximate counter-current heat exchange effect and a vacuum heat collection system. The solar vacuum heat collection pipe comprises an outer pipe and an inner pipe; the inner pipe is sleeved with the outer pipe; a vacuum cavity is formed between the outer pipe and the inner pipe; heat exchange pipes are arranged in the inner pipe; the space between the inner pipe and the heat exchange pipes is filled with a phase-change material; the heat exchange pipes comprise an inlet header, an outlet header and pipes communicating with the inlet header and the outlet header; the inlet header is located on the inner side of the inner pipe; and the outlet header is located on the outer side of the inner pipe. The phase-change heat-storage type solar vacuum heat collection pipe is provided, the inlet header is arranged inside, the outlet header is arranged outside, and the heat exchange form is similar to the counter-current heat exchange form having the best heat exchange effect, so that the best heat exchange effect is realized.

Description

technical field [0001] The invention belongs to the technical field of solar heat collecting tubes, and in particular relates to a solar vacuum heat collecting tube and a system close to countercurrent heat exchange effect. Background technique [0002] As one of the cleanest energy sources, solar energy has received more and more attention and application in today's serious environmental pollution. However, due to the limitation of natural conditions such as seasons, day and night, and the influence of random weather factors such as cloudy, rainy and snowy, the solar irradiance is scattered and intermittent, which increases the difficulty of large-scale application. In order to make solar energy a continuous and stable energy source, it is necessary to store solar radiation in sunny days for use at night and in rainy days. Phase-change heat storage materials use the phase-change heat generated during the phase change process to store and utilize heat. They have the advanta...

AI Technical Summary

Problems solved by technology

The disadvantage of this technology is that the heat exchange area between the simple U-shaped heat exchange tube and the phase change material is small, and the heat exchange efficiency is low.

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