A preliminary study on the factors affecting the thermal performance of the solar-capillary system
In order to solve the problem of low temperature and high humidity in the greenhouse during winter, a solar-capillary heat storage system was developed. The heating performance of different wall treatments, water-tank volumes and flow rates was tested. The results showed that, on rainy days, hazy days or sunny days with normal ventilation, the thermal performance of the reflective film wall was better than that of the blacking wall, and its heat storage capacity was 14.0 MJ. Secondly, when the water volume was 800 kg, the thermal storage performance was better than that of a water volume of 400 kg. Lastly, increasing the flow rate of the system can enhance the thermal performance of the system. When the flow rate was 0.16 m s-1, the heat storage capacity of the system was 7.7 and 16.2% higher than at flow rates of 0.11 and 0.05 m s-1, respectively. However, further investigation of the optimal flow rate is still necessary. Overall, different wall treatments and water-tank volumes have a huge impact on the heating performance of the solar-capillary heat storage system.
Yue, L., Song, W., Ji, W. and He, X. (2018). A preliminary study on the factors affecting the thermal performance of the solar-capillary system. Acta Hortic. 1227, 123-132
greenhouse, heat storage, solar energy, capillary