Analysis of dehumidification method and discussion on improvement measures in solar greenhouse

Abstract

The solar greenhouse is a passive agricultural facility building which can realize the anti-seasonal production. The main enclosure structure of solar greenhouse is composed of thermal insulation wall, thermal insulation roof and daylighting shed film. The transmittance of sunlight is an important index affecting the healthy growth of plants in solar greenhouse. After testing, the difference between the solar radiation intensity received through the greenhouse film and the outdoor solar radiation intensity during a day has large fluctuations. The reason for this phenomenon is that the humidity in the greenhouse is large, and there is condensation on the greenhouse film, which seriously affects the transmittance of sunlight. The dehumidification methods commonly used in solar greenhouses are summarized, and their advantages and disadvantages are analyzed in this paper. In addition, the problems existing in the current dehumidification methods are discussed. In view of the characteristics of the solar greenhouse that the high temperature needs ventilation and cooling during the day and the low temperature at night needs to supplement heat, a composite ventilation system with anti-condensation, heat storage, cooling and dehumidification is proposed, and its performance is analyzed.

Keywords

• solar greenhouse
• solar radiation intensity
• condensation
• dehumidification method
• composite ventilation system