Application of brick wall with phase change rice husk in solar greenhouse

The heat storage charatistics of solar greenhouse wall can affect the indoor temperature and crop growth envirnment. Parrafin and n-butyl stearate mixed with mass ratio 5:5 was chose as compound phase change material（PCM）. The compound PCM was absorbed by rice husk to be stabilized PCM. Two greenhouses were built with the PCM bricks and normal bricks respectively. From differential scanning calorimetry (DSC) analysis, the transition temperature was about from 15℃ to 45℃, while the melting and freezing latent were 58.14 and 70.63 kJ/kg.The indoor temperature and wall surface temperatures were measured. The temperature fluctuation in PCM greenhouse was 4.1℃ lower than that in normal greenhouse. The lowest temperature in PCM greenhouse was 1.7℃ higher than that in normal greenhouse, while the highest temperature in PCM greenhouse was 2.4℃ lower than that in normal greenhouse. The Chaoguan NO.1 tomato was cultivated in two test greenhouses. The growth status was better in PCM greenhouse. The conclusion is that the PCM wall has good effects on the indoor temperature and the crop growth.