Composite energy-saving device and method based on controllable heat insulation layer and phase change energy storage

Abstract

The invention discloses a composite energy-saving device based on a controllable heat insulation layer and phase change energy storage and a method thereof, and belongs to the field of passive coolingand heating of buildings. The composite energy-saving device is composed of an air heat insulation layer and a phase change material layer, and roof function layers such as a waterproof layer and thelike exist between a variable heat insulation layer and the phase change material layer. The variable heat insulation layer changes the thermal resistance between the whole device and the outside byadjusting the thickness of an air layer, so that the energy storage process of the phase change material is optimized. The composite energy-saving device has the advantages that the heat insulation layer is opened in the daytime in summer, the extremely low heat conductivity coefficient of the air layer reduces heat flow entering the building structure from the outside, and melting of the phase change material is slowed down. The heat insulation layer is closed at night in summer to facilitate cooling and solidification of the phase change material through external convection heat exchange. The working conditions in winter are opposite, and the effect of optimizing the energy charging and discharging process of the phase change material is also achieved. In general, by optimizing the energy charging and discharging process of the phase change material, the cold and hot load of a house is reduced, and energy conservation and emission reduction are achieved.

Description

technical field [0001] The invention belongs to the field of passive building cooling and heating, and in particular relates to a composite energy-saving device based on a controllable heat insulation layer and phase-change energy storage and a method thereof. Background technique [0002] With the intensification of global warming and people's higher and higher requirements for quality of life, the demand for indoor cooling and heating has increased significantly. In recent years, passive building cooling and heating technologies that do not consume energy have received more and more attention. [0003] With its high latent heat in the operating temperature range, phase change materials can absorb and release a large amount of heat while maintaining a stable temperature. Because of this property, it is used in buildings to maintain a stable indoor temperature and improve human comfort. Thermal insulation in the building envelope can effectively reduce building heat flow, ...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the defects of phase change materials in the prior art that it is difficult to cool and solidify in summer, and to absorb heat and melt in winter, and to provide a composite energy-saving device based on a controllable heat insulation layer and phase change energy storage

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