Vapor pressure deficit and the high temperature emerged during the summer months in the countries with
Mediterranean climate, results in decrease of the quantity and the quality of the products produced in greenhouses. During
this period, to reduce the plant stress and in order to provide high quality products to the market, greenhouses are required to
be cooled. In order to reduce the temperatures in greenhouse, natural ventilation is the first method considered. Although
natural ventilation; is cheaper than the other forced methods in terms of the first investment and operating expenses, it is not
enough to reduce the high temperatures in the greenhouse during the periods when the temperatures are starting to increase.
The advantage of the forced ventilation method with fans is the higher amount of air exchange ratio and the ability to control
ratio compared to natural ventilation. This method, too, is insufficient in the summer months to reduce the high temperatures
inside the greenhouse. Another method is the shading method; which helps to lower high temperatures in the inside the
greenhouse by reducing the radiation reaching the greenhouse. In this method, reduced temperature level inside the
greenhouse is insufficient for plant growth, and also improper use of this method causes reduced use of sunlight by plants.
One of the most effective solutions for cooling the greenhouse during these periods when natural ventilation, forced
ventilation and shading methods are inadequate is evaporative cooling. In this study, ventilation (natural and forced),
shading and evaporative cooling methods, used to reduce the effect of high temperature that occurs in greenhouses, and
advantages and disadvantages of these methods have been evaluated.
Primary Language | Turkish |
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Journal Section | Review |
Authors | |
Publication Date | February 28, 2017 |
Published in Issue | Year 2017 Volume: 4 Issue: 1 |