Preparation And Properties Of Temperature Self-Operating Units

This work aimed at the problems of phase change materials (PCMs) exudation and low content of PCMs, prepared temperature self-operating units (TSOUs) by the packaging method of Organic/Inorganic nano composite materials. Optimization of experimental parameters was carried out and the evaluation method of properties was studied to acquire TSOUs with the maximum PCM content and high stablity.The adsorption theory of micropore inorganic materials was studied to direct the preparation of TSOUs by Organic/Inorganic nano composite materials. The microstructure of TSOUs was established based on the theory that the micropore is filled during the process of micropore materials adsorption. According to the microstructure, the TSOUs are consist of two sections: the adsorbent of micropore inorganic materials and PCMs. TSOUs with the maximum PCM content and high stability may be prepared by making good use of the nano effect and surface effect of Organic/Inorganic nano composite materials. According to the microstructure, the saturated adsorption amount of micropore inorganic material is 73.47%.Directed by the adsorption theories, sepiolite was selected as micropore inorganic material and dodecanol was selected as PCM, and carried out the optimization of experimental parameters, such as selection of sepiolite minerals, sepiolite modification, absorption temperature, PCMs solution concentration, stirring time, drying mode, dehydration of sepiolite. By the optimization, the best conditions on TSOUs preparation were achieved.Measurement method of PCMs exudation was established to estimate the exudation of PCM in TSOUs, the temperature self-operating effects and energy saving effects of TSOUs was also examined. Results show that the energy saving effect of TSOUs reached 12.69% when the temperature was self-operated by 1.3 ℃The TSOUs with the maximum PCM content of 67.96% were prepared through this work, the value accord with the theoric adsorption amount. The PCMs exudation in TSOUs is less than lwt% that meets the requirement of stability. The TSOUs is stable enough to satisfy the demand of application in building materials, and it has broad foreground of application.