日光温室相变空心砌块的制备及功效

Preparation of the small concrete hollow block with PCM and its efficacy in greenhouses

相变储热是近年来建筑与能源界非常重视的研究热点,将其应用于温室节能有重要意义。该文通过热流分析的方法提出了适合用于温室的复合相变材料的配比及其工程封装,进而提出了一种适用于日光温室建造的复合相变材料,分析了用于温室储热的复合相变材料的性能与技术问题。通过研究,Na2SO4·10H2O和Na2CO3·10H2O体系,以试样质量比4︰6的组合较为理想,相变温度分为两个阶段,适合于满足一般温室生产对温度的要求。但是,长期使用过程中仍然存在过冷现象和相分离。Na2SO4·10H2O和Na2HPO4·12H2O体系以试样质量比1.9︰7.0的组合较为理想,相变温度稳定,过冷和相分离均能很好的满足要求。该文可为温室应用相变储热技术的进一步研究和温室建筑结构的改良提供参考。

Phase-change heat storage is a hot area in building and energy researches,and it is very important to apply this technique to greenhouses.This paper analyzes the characteristics of phase-change materials for greenhouses and the preparation of the small concrete hollow block with PCM and its efficacy in greenhouses,and points out the way to use phase-change heat storage techniques in greenhouses.By researching their thermal properties by Differential Scanning Celemeter（DSC）,for the new compound PCM composed of Na2SO4·10H2O and Na2 CO3·10H2O,the sample in t he mass proportion of 4：6 is suitable for greenhouse.The phase transformation temperature which divided into two stages meets the need of plant growth.During the application process,the phenomena of super cooling and phase segregation can’t be eliminated completely.For the new compound PCM composed of Na2SO4·10H2O and Na2HPO4·12H2O,the sample in the mass proportion of 1.9：7 is suitable for greenhouse.The phase transformation temperature remain stable, the phenomena of super cooling and phase segregation meet the requirements.This paper serves as a valuable reference for researchers with regard to developing new ideas and methods in applying phase-change material in greenhouses.