Design drawings of glass greenhouses produced by Qingzhou Changrong Greenhouse Engineering Co., Ltd.:

① Span. The horizontal distance between the axes of two adjacent columns inside the greenhouse in the direction perpendicular to the gutter. Usually, greenhouse span specifications are 6.00m, 6.40m, 7.00m, 8.00m, 9.00m, 9.60m, 10.80m, and 12.80m.

② Bay width. The horizontal distance between the axes of two adjacent columns inside the greenhouse along the gutter direction. Usually, greenhouse bay width specifications are 3.00m, 4.00m, 4.50m, and 5.00m.

③ Eave height. The vertical distance from the designed indoor floor level to the lower edge of the gutter. Usually, greenhouse eave height specifications are 3.00m, 3.50m, 4.00m, 4.50m, and 5.00m. In recent years, in order to improve the natural ventilation capacity of greenhouses and reduce the cooling load in summer, the greenhouse eave height has gradually been increasing.

④ Ridge height. The distance from the designed indoor floor level to the highest point of the greenhouse frame, usually the sum of the eave height and the roof height.

(2) Overall dimensions and scale of the greenhouse. The overall dimensions of a greenhouse mainly include its length, width, and total height.

① Length. Refers to the total length of the greenhouse in the larger dimension.

② Width. Refers to the total length of the greenhouse in the smaller dimension.

③ Total height. Refers to the distance from the designed indoor floor level to the highest point of the greenhouse, which can be the roof of the greenhouse or other external components (such as the external shading system).

The overall dimensions of the greenhouse determine its plan and spatial scale. Generally, the larger the greenhouse, the more stable the indoor climate, and the lower the cost per unit area, but the total investment increases and the management difficulty rises. Therefore, it is difficult to define the appropriate scale for a greenhouse; it can only be determined comprehensively based on planting requirements, site conditions, degree of mechanization, automation level, investment, and other factors. From the perspective of ensuring greenhouse ventilation, for greenhouses mainly relying on side natural ventilation, the ventilation direction dimension should not exceed 40m, and the individual building area should be 1000–3000㎡. For tall greenhouses mainly relying on roof natural ventilation, length, width, and building area are not restricted by the above requirements; for mechanically ventilated greenhouses, the distance between air inlets and outlets should be less than 60m, and the individual building area should be 3000–5000㎡.