Gradient grating phase change heat accumulator

Abstract

The invention relates to a gradient grating phase change heat accumulator. The heat accumulator is characterized in that a heat exchange pipeline is arranged in a phase change heat storage shell, the phase change heat storage shell and the heat exchange pipeline are connected into a whole, a gradient grating type heat exchange surface is arranged at the part, located in the phase change heat storage shell, of the outer wall of the heat exchange pipeline, a phase change material is arranged in a space between the gradient grating type heat exchange surface and the phase change heat storage shell, and the heat transfer between the phase change material and a heat exchange fluid channel is realized by the gradient grating type heat exchange surface. According to the gradient grating phase change heat accumulator, the grating type heat exchange surface is adopted, so that the heat exchange area is increased, and the heat exchange time is prolonged by means of a grating type groove; the width gradient grating type heat exchange surface is adopted, so that the phenomenon of overheating of the hot fluid inlet section is avoided; and the length of the heat exchange pipeline is inversely proportional to the phase change temperature of the phase change heat storage material, so that the heat storage capacity of the phase change material is effectively improved. According to the gradient grating phase change heat accumulator, the rapid response between the fluid and the phase change heat storage material can be realized, the heat exchange effect is enhanced, and the problem of temperature stratification of the phase change heat storage material is solved.

Description

technical field [0001] The invention relates to a heat accumulator, in particular to a phase change type heat accumulator. Background technique [0002] As a new type of energy storage device, the phase change heat accumulator is mainly used in the storage and utilization of waste heat. It has high heat storage density, stable working temperature, and simple operating mechanism, that is, the process of solid-liquid phase change of PCM is used to realize energy storage and release. However, heat storage phase change heat accumulators generally have technical problems such as low heat storage, slow heat storage and discharge speed, severe temperature stratification in the heat accumulator, and local overheating. The resulting temperature unevenness will affect the service life of the heat accumulator. Patent Notification No. CN105115339A discloses a fast-response phase-change heat accumulator. The phase-change heat accumulator described in the invention patent is set on the o...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of slow response, less heat storage, and uneven temperature of phase change materials in phase change heat accumulators, and provide a gradual change grid phase change heat storage device, which uses a gradual change grid heat exchange surface to increase heat transfer The contact area between the fluid and the phase change material, and the grid structure destroys the boundary layer on the wall of the heat exchange pipe, thereby strengthening the heat exchange between the heat exchange fluid and the wall of the heat exchange pipe, and improving the heat transfer rate and heat transfer amount of the phase change material; Another purpose of the present invention is to solve the phenomenon that the phase change material in the phase change heat accumulator is prone to uneven temperature distribution, resulting in local overheating and excessive thermal stress of the heat storage container, and timely export heat through reasonable gradient grid interval design , to improve the temperature uniformity of phase change heat storage materials

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