Multistage phase-change heat storage type solar heating and heating water supply system

Abstract

The invention relates to a multistage phase-change heat storage type solar heating and heating water supply system. A spiral heat exchange tube is arranged in an inner cavity of a solar vacuum heat collection tube, meanwhile, a phase change material is partially filled in a gap between the spiral heat exchange tube and the inner cavity of the solar vacuum heat collection tube, the spiral tube is compact in structure, large in heat transfer area and high in phase change material energy storage, isothermal in the energy storage process, and provides a solar vacuum heat collection tube with heatcollection and heat storage functions. According to the multistage phase-change heat storage type solar heating and heating water supply system, a reflective coating is coated on the shady side of a high borosilicate glass tube, the oblique sunlight is reflected to a selective absorption coating on the outer surface of a metal inner tube, and the illumination loss is reduced. The phase change material is graded and filled into three parts of a solar vacuum heat collection tube, a water collector and a hot water tank, compared with a centralized heat storage device, the space is saved, the material accumulation thickness is reduced, and the heat transfer efficiency is improved. According to the whole system, solar energy is used as a main heat source, the electric energy is an auxiliary heat source, and the requirements of users under various working conditions can be met.

Description

technical field [0001] The invention relates to the field of solar heat utilization, in particular to a multi-stage phase change heat storage type solar heating and hot water supply system. Background technique [0002] With the aggravation of environmental pollution, the utilization of solar energy resources has been paid more and more attention. Solar water heaters have been widely used in daily life. However, it is rare to use solar energy for heating and hot water supply at the same time. The main reasons are as follows: On the one hand, solar energy resources are periodic, intermittent, unstable It is greatly affected by the change of light and cannot achieve stable heat transfer. Only relying on water for heat storage has low efficiency and fast heat dissipation, and it is difficult to meet the long-term heating and hot water needs; on the other hand, solar energy resources during the day It is rich, but residents have little demand for heating and hot water. At night...

AI Technical Summary

Problems solved by technology

However, at present, phase change materials are mainly combined with solar water heating systems, and remain in a single component, or need to establish a centralized heat storage device, which occupies a large space and is difficult to realize the daily use of residents

At the same time, the accumulation thickness of the phase change material in the centralized heat storage device is large, the heat transfer effect is poor, and the heat storage effect is not ideal

At present, there is a lack of a solar system in the market that has a compact structure, a small footprint, and can simultaneously provide heating and hot water.

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