Introduction of glass greenhouse

Introduction of glass greenhouse

Transparency

The greenhouse is a lighting building, so the light transmittance is a basic indicator for evaluating the light transmittance performance of the greenhouse. Light transmittance refers to the percentage of the amount of light that penetrates into the greenhouse to the amount of light outside. The light transmittance of the greenhouse is affected by the light transmittance of the greenhouse light-transmitting covering material and the shadow rate of the greenhouse skeleton, and with the different solar radiation angles in different seasons, the light transmittance of the greenhouse is also changing at any time. The level of light transmittance in the greenhouse has become a direct factor for crop growth and selection of plant varieties. Generally, the multi-span plastic greenhouse is 50%~60%, the light transmittance of the glass greenhouse is 60%~70%, and the solar greenhouse can reach more than 70%.

thermal insulation

Heating energy consumption is the main obstacle to the operation of greenhouses in winter. Improving the thermal insulation performance of the greenhouse and reducing the energy consumption are the direct means to improve the production efficiency of the greenhouse. The thermal insulation ratio of the greenhouse is a basic indicator to measure the thermal insulation performance of the greenhouse. The greenhouse insulation ratio refers to the ratio of the coverage area of the greenhouse light-transmitting material with a smaller thermal resistance to the total area of the greenhouse envelope with a larger thermal resistance. The larger the thermal insulation ratio, the better the thermal insulation performance of the greenhouse.

Durability

Greenhouse construction needs to consider its durability. Greenhouse durability is affected by factors such as the aging resistance of greenhouse materials and the bearing capacity of the main structure of the greenhouse. In addition to its own strength, the durability of light-transmitting materials is also manifested in that the light transmittance of the material decreases with time, and the degree of attenuation of light transmittance is a decisive factor affecting the service life of the light-transmitting material. Generally, the service life of steel structure greenhouse is more than 15 years. The design wind and snow loads are required to be used for 25-year once-in-a-lifetime loads; the bamboo-wood structure simple greenhouse has a service life of 5-10 years, and the design wind and snow loads are used for 15-year once-in-a-lifetime loads.