Abstract
Due to the importance of air ventilation of greenhouses or gardens in producing healthy agricultural crops, the aim of this research is presenting the application of solar chimney to help prevent pest distribution in agricultural products through ventilating the garden. For this purpose, a ventilating chimney works with renewable solar energy is proposed. The circular solar collector placed surrounding the chimney absorbs solar radiations, which causes temperature increment of the air in passing through the collector. The produced natural driving force causes the air to flow into the chimney. Considering reasonable assumptions, the equations demonstrating the motion of the airflow are presented and therefore, the flow rate of air passing through the chimney is calculated. Results indicate that selecting a chimney with lofty altitude and a collector with a considerable value of collector radius to chimney radius ratio increases the airflow rate, which leads to a better performance of the chimney. For higher chimneys operating in lower values of solar radiation, a collector with a large radius should be selected. Results show that selecting a chimney with a diameter of 1 m will cause the decrement of airflow rate due to friction forces up to 13%. It is concluded that a high chimney shows a better performance when it is utilized in gardens having low sea-level altitude.
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