Greenhouse Design for Hot and Humid Southern Regions

Southern tropical and subtropical regions are characterized by long-term high temperature, high humidity, concentrated rainfall, and muggy weather throughout the year. These extreme climatic conditions bring huge challenges to commercial greenhouse planting. Ordinary traditional greenhouses often suffer from poor air circulation, internal overheating, excessive air humidity, rainwater leakage, and internal water accumulation. Long-term high-temperature and high-humid environments will easily trigger fungal and bacterial diseases, cause crop leaf scorch, poor root growth, and reduced yield and quality, seriously affecting the economic benefits of greenhouse planting. Therefore, targeted professional design focusing on ventilation, cooling, and rainproof performance is the core premise for stable and high-yield planting in southern regional greenhouses.

Efficient ventilation design is the foundation of solving high humidity and muggy problems in southern greenhouses. Most commercial greenhouses in southern areas adopt combined natural and mechanical ventilation systems to adapt to complex weather conditions. For multi-span greenhouses, top skylight ventilation and side vertical ventilation are adopted to form a three-dimensional air circulation channel, which can quickly discharge hot and humid air accumulated inside the greenhouse and introduce fresh outside air. In hot and muggy windless days, natural ventilation is limited, so it is necessary to match negative pressure exhaust fans to force air convection. This design can effectively reduce indoor sultriness, balance internal and external air pressure, continuously reduce excess air humidity, and avoid the humid and stuffy environment that breeds crop diseases. Reasonable ventilation layout can also discharge harmful gas generated by crop respiration and soil fermentation, creating a clean air environment for crop growth.

Scientific cooling system configuration is the key to resist continuous high temperature in southern regions. In summer, the internal temperature of ordinary greenhouses can easily exceed 40°C, which exceeds the survival temperature of most crops. The most cost-effective and widely used professional solution is the wet curtain and fan cooling system, which realizes rapid cooling through water evaporation and air circulation. When the outdoor temperature is extremely high, the matching external sunshade system can block direct strong sunlight, reduce heat radiation entering the greenhouse, and avoid rapid temperature rise and crop sunburn. Different from single cooling equipment, the combined cooling mode of sunshade and wet curtain can stably control the greenhouse internal temperature within 25-32°C, meeting the growth needs of most vegetables, flowers and economic crops. It avoids crop growth stagnation and yield reduction caused by high temperature stress, and greatly reduces planting risks in high-temperature seasons.

Reliable rainproof structural design guarantees stable operation of greenhouses in rainy seasons. Southern regions have concentrated rainfall and frequent rainstorms, so greenhouse structures must have excellent rainproof and drainage capabilities. Professional customized greenhouses adopt fully sealed edge sealing and waterproof groove design to prevent rainwater from penetrating through gaps of windows and film. The top of the greenhouse is equipped with streamlined drainage grooves and centralized drainage pipelines, which can quickly discharge rainwater, avoid top water accumulation and structural pressure, and prevent rainwater from pouring back into the planting area. At the same time, the ventilation windows are equipped with rainproof baffles, which can maintain normal ventilation while blocking rainwater invasion in rainy and windy weather. This integrated rainproof and drainage design effectively solves the problems of internal water accumulation, soil waterlogging and crop root rot caused by rainy season rainfall.