石膏基相变储能构件的数值模拟分析

Numerical simulation analysis of gypsum-based phase change energy storage component

以石蜡为相变储能材料,石膏为基础材料,制备不同配比的石膏基-石蜡相变储能构件并利用现有热工测试方法进行了热工性能测试。将测试数据代入经验证过的相变模型模拟了北京地区被动式建筑中相变构件的应用效果,并对结果进行了优化处理。结果表明:随着石蜡含量的增大,相变构件的热导率随之减小;制备的四种配比中PCM质量分数为33%的相变构件在北京地区被动式建筑中应用效果最好,在过渡季中较传统建筑可节能10%;增大构件的热导率与提高墙体表面对流传热系数均可提高室内舒适度与节能效果,且对流传热系数的影响程度更大。

In order to solve phase change energy-saving technology applications in building envelope thermal design and improve indoor thermal comfort,experimental and theoretical studies about phase change component were carried out in this paper.The composite phase change component with different mass of phase change material was made of super-hemihydrate plaster and paraffin phase change material. DSC method was used to test phase change energy storage gypsum board's phase change temperature and phase change latent heat and steady-state test method was used to test thermal conductivity of different proportions of the component.Phase change heat transfer model was established and simplified.Heat transfer process and heat transfer mechanism of the component were analyzed.Solved by numerical simulation to study the effect of different proportions of phase change component in the Beijing area. Changing thermal conductivity and convective heat transfer coefficient respectively,application effects were studied for opotimization.The results show that along with the rising of the paraffin content,the thermal conductivity of phase change component minished.Among the four kinds ratio,component with 33% PCM had the best application effect in passive buildings in Beijng and in transition season its energysaving amount was 10% more than that in traditional buildings.Enlarging thermal conductivity and convective heat transfer coefficient of phase change component can both improve indoor comfort and reduce energy consumption.The results of the research can provide a reference for building envelope thermal design with phase change material.