The Effect And Mechanism Of Indoor Temperature And Humidity Regulation With Humidity-controlling Materials

The results show that the indoor relative humidity should be between 40% and 60%.Most of the time in the southern region is in a high humidity state,indoor humidity is high,which seriously affects people's normal production and life.It is not in line with the concept of sustainable development to regulate relative humidity by humidity regulating equipment.Therefore,how to apply the humidity-controlling materials to the building inner wall to form a certain large surface with certain strength and water resistance and have good temperature and humidity regulation effect under the condition of airtight and ventilation with the outside,which is of great significance to the improvement of indoor human settlements environment and the sustainable utilization of resources.In this paper,three inorganic minerals,diatomite,sepiolite and zeolite,are used as the main raw materials.On the basis of the previous experimental study,the inorganic mineral humidity-controlling materials are prepared by selecting the optimum mix ratio according to the strength,water resistance and humidity-controlling performance parameters of humidity-controlling materials.The effect of indoor temperature and humidity regulation of various humidity-controlling materials under different working conditions was studied.The relationship and difference of humidity-controlling mechanism of various materials were studied based on the micro-morphology and pore characteristics of materials.A preliminary theoretical exploration was made for the follow-up application of humidity-controlling materials.The results show that:(1)Considering the changes of indoor relative humidity and air moisture content,the optimum spraying thickness of diatomite humidity-controlling materials is 1 mm.Under this spraying thickness condition,diatomite humidity-controlling materials can maintain the relative humidity of the chamber at about 55% under closed conditions,effectively reduce the fluctuation of relative humidity,and the air moisture content can be reduced by about 0.5-1 g/kg.The humidity-controlling materials achieves the dynamic balance of moisture absorption and desorption when the 4mm*600mm gap is reserved in the chamber.Increasing the spraying thickness of materials has no significant effect on the chamber temperature.(2)Considering the changes of indoor relative humidity and air moisture content,the effect of temperature and humidity regulation of sphagnum/diatomite humiditycontrolling materials is better under 1 mm spraying thickness,followed by sphagnum/sepiolite humidity-controlling materials,and sphagnum/zeolite humiditycontrolling materials is weaker.Under sealed conditions,sphagnum/diatomite,sphagnum/sepiolite and sphagnum/zeolite humidity-controlling materials can reduce the indoor relative humidity by 11.4%,5.7% and 2.9% respectively,the maximum decrease of air moisture content was about 23.8%,22.8% and 16.2% respectively and ultimately maintain the relative humidity at 65%,67% and 70%.Three kinds of sphagnum/inorganic mineral humidity-controlling materials gradually reach the dynamic equilibrium of moisture absorption and desorption when the 8 mm*600 mm gap is reserved in the chamber.At the same time,they can regulate the chamber temperature from 0.5 to 1 under different working conditions.(3)The analysis of micro-morphology and pore structure shows that after the compounding of sphagnum,the original micro-structure of the three sphagnum/inorganic mineral humidity-controlling materials is retained,and the unique water-storing cells of sphagnum are added to improve the humidity-controlling performance of the materials.The specific surface areas of sphagnum/diatomite,sphagnum/sepiolite and sphagnum/zeolite humidity-controlling materials are 58.35 m2/g,52.42 m2/g and 28.37 m2/g respectively.In the actual process of temperature and humidity regulation,the main way to regulate humidity is surface physical adsorption,so the temperature and humidity regulation effect of sphagnum/diatomite humiditycontrolling materials is better,followed by sphagnum/sepiolite humidity-controlling materials and the effect of sphagnum/zeolite humidity-controlling materials is weak.