基于六水氯化钙的复合相变调湿材料的制备及热湿性能的研究OA

This paper investigates the preparation and hygrothermal properties of a composite phase change humidity control material.Using hexahydrate calcium chloride as the phase change material and expanded graphite as the carrier material,a composite phase change material was prepared through a porous adsorption method.This material was then combined with diatomite to produce a composite phase change humidity control material capable of regulating both temperature and humidity.The findings reveal that diatomite exhibits excellent humidity control capabilities,with a moisture buffer value of 3.81 g/m2·%RH,a specific surface area of 57.421 m2/g.The composite phase change material demonstrates a phase change temperature of 25.36℃and a latent heat of 90.68 J/g,alongside good thermal stability.By examining the thermal storage performance of the composite phase change material under varying humidity conditions,it was discovered that dry diatomite can slow the decline in the thermal properties of the composite phase change material,with the effect being more pronounced with increasing diatomite thickness.When the diatomite and composite phase change material were bonded using building structural adhesive,the thermal storage performance of the composite phase change humidity control material became unaffected by humidity.Applying the prepared composite phase change humidity control material in a small room model in the Guangzhou area demonstrated its effectiveness in reducing fluctuations in indoor temperature and humidity,thereby positively impacting the indoor thermal and humidity environment.