制作方式对日光温室相变蓄热材料热性能的影响

日光温室墙体能否在有限的日照时间内高效蓄集太阳能，与日光温室墙体层的构筑方式以及所采用的建筑材料的热工性能（热阻、比热容、体积质量）直接关联。该研究将所研制的相变材料与普通建筑基材分别以直接混合方式和插层方式制成复合相变蓄热墙体材料板，通过比较试验的方法，从蓄热温度、时间、以及蓄热量等方面，比较了2种不同构筑方式对复合相变蓄热墙体材料蓄/放热特性和传热性能的影响规律。结果表明：同样蓄（放）热温度条件下，直混试件比插层试件提前70?min结束蓄（放）热；直混试件的蓄热量比插层试件大10%，放热量大15%，直接混合方式制成的复合相变蓄热墙体材料板的传热性能和蓄放热效率更好。该研究结果可为相变蓄热技术在日光温室建筑墙体的科学应用提供方法与建筑热工理论参考。

Effects of building methods on thermal properties of phase change heat storage composite for solar greenhouse

Solar storage efficiency of solar greenhouse wall during the daytime is directly related to the construction of greenhouse wall layers and thermal properties of wall materials (thermal resistance, heat capacity, density etc.). Two composite phase change heat storage wallboards (mixed block and intercalation block) building by different methods were developed in this study. Mixed block was made by directly mixing the phase change materials (PCM) with cement mortar, and intercalation block was made by intercalating PCM into two cement mortar layers. The thermal properties under charge and discharge process, and the heat transfer performance of the two structures had been studied by the comparison experiment. The results showed that, under the same charge and discharge conditions, the mixed block completed heat storage/release in 70min, which was earlier than the intercalation block; the heat storage/release amount of mixed block was 10%/15% more than that of the intercalation block. A better thermal performance could be achieved by using the directly mixed way. The conclusion provides the reference for the scientific application of phase change thermal storage technology in solar greenhouse.