Study on Diurnal Double-cycle Heat and Humidity Control System of Solar Greenhouse Based on Solar Narrow Trough Collector
Greenhouses located in middle and high latitudes are difficult to avoid the problem of high relative humidity and low temperature at night in winter.In this study,a greenhouse heat and humidity control system combining narrow trough collector and solid desiccant was proposed for a Chinese solar greenhouse.Through optical simulation and geometric relationship analysis,the narrow trough collector placed at an angle of 30° can provide more than 80％of light reception efficiency for the narrow trough collector in winter in Beijing at 40° N latitude.The system was able to regulate the nighttime relative humidity of the greenhouse from a high humidity range of 94.2％to a normal crop growth range of 81.3％in winter,with an average relative humidity decrease of 12.9％and an average indoor temperature increase of 1.2℃.The maximum outlet temperature of the narrow trough collector during the daytime desiccation stage was 136℃,and the average collector efficiency was 0.62.The system combined solar medium temperature collector technology with recyclable solid desiccant to control the air environment in the greenhouse in winter to a crop growth suitable zone.
NETL
NSTL
万方数据
维普
