Numerical Study on the Effects of Spray System and Wet Pads on the Greenhouse Temperature Distribution by Fan Ventilation System

Shahriari, Sajjad; Moayyedi, Mohammad Kazem

Numerical Study on the Effects of Spray System and Wet Pads on the Greenhouse Temperature Distribution by Fan Ventilation System

Document Type : Original Article

Authors

¹ Master's degree, Department of Mechanical Engineering, University of Qom, Qom, Iran

² Associate Professor, Research Laboratory of Earth Atmosphere and Space Sciences, Department of Mechanical Engineering, University of Qom, Qom, Iran

Abstract

In this research, the behavior of air flow, temperature, and humidity changes in a greenhouse hall will be modeled with the help of numerical simulation. To increase the humidity of the air flowing inside the greenhouse hall, two amounts of 04 water are sprayed into the air passing into the greenhouse hall using three different methods. In the first method, two moisture pads and in the second method, two sprinklers spray water at specific and fixed distances and at a height of 3 meters from the floor of the greenhouse. In the third method, twenty-seven sprinklers spray water droplets in different coordinates to the passing air of the greenhouse. On the other side of the greenhouse hall, there are four fans with negative pressure, establishing the flow of fresh air inside the hall. To model the effects of turbulence in the flow field, the turbulence modeling approach has been used. After validating the numerical results, the outcome model has been used to study the flow behavior and the effect of the latent energy of water in greenhouse ventilation and relative humidity. By examining fourteen modes of moisture injection into the greenhouse, the most optimal mode - 50-b-27f has been obtained. On the other hand, if the mentioned plans are examined with the criterion of temperature changes and suitable environmental conditions, it can be seen that the 100-c-p mode will be the best plan for the growth of plants such as Gladiolus in the greenhouse environment.

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