When designing a ventilation and cooling system for a summer greenhouse, it’s important to consider the greenhouse type, climate conditions, and crop requirements to create a more targeted configuration. Below are ventilation and cooling design options for different greenhouse types:
First, for large multi-span greenhouses, multiple sets of vents can be used in conjunction with a wet curtain cooling system.
Second, for smaller arched greenhouses, a combination of natural ventilation and shade nets is more suitable.
In addition, when designing ventilation for semi-underground greenhouses, special attention should be paid to the layout of the bottom vents.
1.Glass Greenhouse
- Wet Curtain-Fan Forced Cooling System
Wet curtains are installed at the north end of the greenhouse, and fans are installed at the south end, creating negative pressure ventilation. As hot air passes through the wet curtains, it evaporates and cools. Once the cool air enters the greenhouse, it absorbs heat and is then exhausted by the fans. This system is highly effective and is particularly suitable for hot and dry regions.
- External Shading System
Highly reflective shade nets block direct sunlight, reducing the greenhouse’s internal temperature by 4-6°C.
- Rooftop Windows for Natural Ventilation
Powered or manually operated windows utilize the principle of rising hot air to dissipate heat. This method is particularly suitable for supplementary cooling in spring and autumn.
2. Multi-Span Film Greenhouse
- Combined Top and Side Window Ventilation
Continuous butterfly-shaped windows are used on the top, and roll-film vents are installed on the side walls to enhance natural convection.
- Spray Cooling System
High-pressure micro-mist nozzles are installed on the top. As the mist particles evaporate, they absorb heat, achieving uniform cooling. This nozzle is particularly suitable for areas with low humidity.
- External Shading + Internal Shading Combination
External shading blocks direct sunlight, while internal shading reduces secondary radiation, resulting in a dual cooling effect.
3. Solar Greenhouse (Winter-Warm Greenhouse)
- Top Ventilation Design
Because the north wall needs insulation, vents are typically located at the top and can be controlled using ropes or motorized film winders.
- Groundwater Circulation Cooling
Using cold water from the ground, it circulates through a surface cooler and is combined with a fan to achieve cooling. This method is particularly suitable for nighttime cooling needs.
- Wet Curtain Assisted Cooling
Combining a wet curtain and fan system during high-temperature periods improves cooling efficiency.
4. Ventilated Glass Greenhouse
- Staggered Top-Opening Window System
Using motorized staggered opening windows to enhance natural ventilation and reduce mechanical energy consumption.
- Fan-Wet Curtain Combination
Suitable for greenhouses with large spans, it easily and pleasantly ensures smooth and even air flow.
Optimization Recommendations
Choose a system tailored to local conditions: In hot, dry areas, wet curtains and fans are preferred; in humid areas, misting and shading can be combined.
Automated Control: Integrated temperature and humidity sensors automatically adjust ventilation and shading to improve management efficiency.
Maintenance and Energy Management: Regularly clean wet curtains, inspect fans, and optimize operating hours to reduce energy consumption.
For each greenhouse type, consider its structural characteristics before selecting the most appropriate cooling solution. If necessary, you can combine multiple methods to achieve optimal results.
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