Abstract
The objective of this article is to evaluate the inside temperature of greenhouse and efficiency of fogging system under the influence of solar power. A 50% off sun shading roof was selected to test in this study. Testing is divided to 2 cases. Case I Measuring all of parameters without operate the fogging system and ventilation between 9.00 a.m. to 5.00 p.m. (Thailand’s time zone). Case II Measuring all of parameters with a fogging system that was controlled the relative humidity below 80% all day. The results show that the highest temperature in greenhouse is 50.13oC (no fogging and ventilation). the developed empirical model has an error 6.33% between numerical results and measured air temperature. In case of neglected solar power, the model showed that the fogging system can reduce the temperature in greenhouse in range of 7.05°C (18.44%) and the efficiency of fogging system is quite high (value is 57.36%). The important factor that influents on the air temperature in greenhouse is solar power. If we need to control the atmosphere in greenhouse by fogging system than the reduction of solar power is the most important controlling factor.
Highlights
At present, the use of greenhouses is becoming increasingly popular because it is the safest way of vegetable and fruit production, enabling the control of pathogen contamination and the effective destruction of pests
Case II study air’s dry-bulb temperature and relative humidity inside the greenhouse with a fogging system that was controlled the relative humidity inside not much more than 80%
The results show the air temperature in case I is highest at 50.13๐C and the air temperature in case II are lower than case I in all day of study
Summary
The use of greenhouses is becoming increasingly popular because it is the safest way of vegetable and fruit production, enabling the control of pathogen contamination and the effective destruction of pests. The common method is shading the sun light by covered the greenhouse roof with shading net and fogging water in greenhouse to reduce the inside air temperature. This method can result in a lower air temperature with high relative humidity that is suitable for plant growth [1]. The purpose of this article is to present the numerical technique for analyzing temperature in a fogging greenhouse with shading net covered on its roof This technique can be used to evaluate the effect of solar power on air temperature in the greenhouse and the fogging greenhouse efficiency
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