πΏ Functioning of a Naturally Ventilated Polyhouse (NVPH)
A NaturallyVentilated Polyhouse (NVPH), also known as a Naturally Ventilated Greenhouse, is a protected cultivation structure that relies entirely on natural airflow to maintain an optimal internal environment for plant growth. It does not use any artificial ventilation systems. The NVPH functions based on natural ventilation principles such as the stack effect, where warm air rises and escapes through roof vents, and cross ventilation, where cool air enters through side vents. This natural airflow system helps regulate temperature and humidity inside the polyhouse, creating ideal growing conditions. NVPHs are widely used in vegetable cultivation and floriculture due to their efficiency, sustainability, and cost-effectiveness. Natural Ventilation Mechanism : 1. Stack Effect: Warm Air Rises and Escapes The polyhouse is covered with a transparent polyethylene sheet that traps heat inside, warming the air and soil. As air inside the polyhouse heats up, it...