A naturally ventilated polyhouse, also known as a naturally ventilated greenhouse or a naturally ventilated hoop house, is a type of agricultural structure designed for plant cultivation. It combines the benefits of a polyhouse (a greenhouse made of polyethylene or similar material) with natural ventilation techniques to create a controlled environment for plant growth.

The primary feature of a naturally ventilated polyhouse is its ability to regulate temperature and airflow through natural means, such as wind and thermal buoyancy. It utilizes vents, openings, and the design of the structure to allow for the exchange of air, preventing excessive heat buildup and maintaining a suitable climate for the plants.

Here are some key aspects and benefits of a naturally ventilated polyhouse:

Ventilation: The structure incorporates vents or openings at various locations, including the sidewalls, roof, or end walls, to allow for the entry and exit of air. By utilizing wind pressure and the principle of convection, fresh air can be drawn in while hot air and moisture are expelled, helping to regulate temperature, humidity, and CO2 levels.
Passive Cooling: Natural ventilation helps to cool the polyhouse during hot weather conditions. As hot air rises, it escapes through the vents, creating a vacuum effect that draws in cooler air from outside. This passive cooling technique reduces the reliance on energy-consuming cooling systems.
Energy Efficiency: Since natural ventilation relies on the principles of airflow and temperature differentials, it reduces the need for mechanical ventilation systems and energy consumption. This can lead to cost savings and increased sustainability.
Crop Protection: The polyhouse structure provides protection against pests, diseases, and adverse weather conditions, such as heavy rain, hail, or strong winds. It creates a microclimate that promotes plant growth and allows for extended growing seasons.
Customization: Naturally ventilated polyhouses can be designed to meet specific crop requirements, taking into account factors like sunlight exposure, wind patterns, and temperature control. The design can be tailored to suit different types of plants, maximizing productivity and yield.
Environmental Control: While natural ventilation is the primary means of climate control, additional features like shade screens, insect screens, and thermal curtains can be incorporated into the polyhouse design to further enhance environmental control and optimize growing conditions.

Natural Ventileted Polyhouse