A Numerical Investigation of the Homogeneous Growing Conditions in a Multi-Layer Plant Growing Chamber

• Main Authors: Jin-Syue Lin, 李金學
• Other Authors: Jeng-Min Huang
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/99609358851448971442

碩士 === 國立勤益科技大學 === 冷凍空調系 === 98 === Multi-layer plant growing chambers can improve the product quantity on the same area. It could be a solution to solve the problem of insufficient food. It is also a significant future application to air-conditioning field. Multi-layer plant growing chambers should have homogeneous growing conditions in order to have a uniform quality of plant. This study numerically investigates the homogeneous growing conditions in a multi-layer plant growing chamber. Parameters includes inlet/outlet positions, light source positions, heat generation rate of light, air change rate, number of layer, photosynthesis ability of plant and the CO2 concentration at inlet. The average value and standard deviation are used to check the homogeneity of growing conditions. The effect of natural convection is included in this study. Four cases are coordinated from different inlet/outlet positions and different light source positions. Results show that there is lower homogeneity between layers and higher homogeneity inside layer for the cases with the inlet locating on the top surface of chamber. When light sources are located on the surfaces above plants, the homogeneity of CO2 is slightly better and the homogeneity of temperature is slightly worse than that located on the mid of chamber. Generally, the growing conditions become more inhomogeneous when heat generation of light source, number of layer, photosynthesis ability of plant, inflow CO2 concentration increase. Generally, the homogeneity of growing conditions increases when the air change rate increases. The homogeneity of CO2 is the lowest in growing conditions while the temperature is the highest. The case with light source locating on the mid-plant of chamber and the inlet on the side wall of chamber will provide most homogeneous growing conditions for plants.