太阳能相变蓄能通风系统实验研究

针对太阳能通风的不稳定性和不可控性,提供一种利用太阳能作为热源,相变蓄热材料在日间进行蓄热,夜间利用储存热量热压通风的新型系统,使建筑物达到理想的通风效果。通过分别对相变温度为63℃、44℃的相变蓄热材料进行通风实验,得到不同相变温度下系统夜间通风量变化特性。结果表明,采用相变温度分别为63℃、44℃的相变蓄热材料棕榈酸和月桂酸,太阳能通风系统在夜间通风10 h累计通风量分别为806.6 m3、615.4 m3,单位面积水平集热面通风量分别为53.8 m3/h、41 m3/h。使用棕榈酸的通风系统效果要优于使用月桂酸。提出的太阳能通风屋顶结合相变蓄热系统能有效的强化建筑物夜间自然通风,改善建筑室内热环境,减少空调用能。

Experimental Analysis of Solar Energy Combined with Phase change Energy Storage Ventilation System

Solar Ventilation System is unstable and uncontrollable,so a new technology is proposed to get a system that takes solar energy as heat source and applies phase change material in daytime to store energy which is used to keep ventilation in nighttime by thermal pressure.This new system is helpful to get the ideal ventilation effect for buildings.Through the experiments on ventilation with PCM of 63℃ and 44℃,ventilation rate change curve is obtained to analyse ventilation system efficiency.The results indicate that using the PCM of 63℃ and 44℃,the total ventilation of the solar ventilation system in 10 hours are respectively 806.6 m3 and 615.4 m3 at night,and the average ventilation per hour and area are 53.8 m3/h and 41 m3/h.Based on the experiment,when PCM is palmitic acid,the ventilation effect is superior than that of lauric acid.To sum up,the system of conventional solar rooftop ventilation system combined with phase change materials can intensify the nature ventilation effectively in nighttime for buildings,improve indoor thermal environment and reduce the energy consumption in air conditioning building.