Optical condensation solar heat collector used at low temperature

Abstract

The invention discloses an optical condensation solar heat collector used at low temperature and belongs to the field of solar energy utilization, wherein the optical condensation solar heat collector comprises a non-vacuum heat collection pipe, an optical condenser, a water tank and inlet and outlet water pipes. The used heat collection pipe is of a non-vacuum type; the inner pipe of the heat collection pipe is a metal pipe, and the surface of the inner pipe is higher in sunlight absorption ratio and lower in infrared emission ratio, and the outer pipe of the heat collection pipe is a glass pipe or a transparent organic pipe; the relative position of the inner pipe and the outer pipe is fixed by a support member and is subjected to dustproof and rainproof seal instead of vacuum seal, and atmosphere instead of vacuum is filled between the inner pipe and the outer pipe; an acyclic structure is adopted for the system, i.e., cold water passes through the inner pipe of the heat collection pipe in one step and is heated up to the final temperature; and the cyclic structure can be adopted to be used in areas in short of water pressure often, and water is repeatedly circulated between the inner pipe and outer pipe of the heat collection pipe through the water pump so as to reach the final temperature. According to the invention, the optothermal conversion efficiency is high, the comprehensive cost is low, the operation is reliable, and the optical condensation solar heat collector used at low temperature is especially suitable for concentrated hot water supply for high-level folk houses, and can be produced on a large scale.

Description

Technical field: [0001] The invention relates to a concentrated solar heat collector for low temperature and belongs to the technical field of solar energy utilization. Background technique: [0002] Solar heat collectors have been widely used in residential hot water supply, but there are many problems, including water leakage in the in-line structure and freezing and cracking of heat collecting pipes in winter. Regardless of the in-line or heat pipe structure, the actual light-to-heat conversion efficiency achieved is generally lower than 40%. For such a low thermal efficiency, in common high-rise residential buildings, even if the roof is fully utilized, it can only meet the needs of a small number of families. Currently, only residents close to the top floor can use solar water heaters, and the installation is messy, which affects the appearance of the city. Although balcony-type heat collectors are also being developed, there are more problems and it is difficult to p...

AI Technical Summary

Problems solved by technology

Since the working temperature is as high as above 400°C, non-vacuum heat collecting tubes cannot be used, otherwise the heat loss will be too large and the power generation efficiency will be greatly reduced

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