summarizes WBD in Mobile, one of the most humid areas of the state. Because of the high humidity in Alabama, the ability to cool with evaporative cooling is somewhat limited, but may be significant depending on the situation.
WBD represents how much the air can be cooled through evaporative cooling.Īs humidity increases, the gap between wet and dry bulb temperature decreases resulting in less efficient cooling. This difference is the Wet Bulb Depression (WBD). The ability to cool with evaporative cooling can be estimated by taking the difference between wet and dry bulb temperatures.
In Alabama we have exceptionally high humidity, especially along the Gulf Coast. Wet Bulb DepressionĮvaporative cooling becomes more efficient as the relative humidity drops. Cellulosic pad materials are the preferred choice by most growers as they last longer than aspen pads. Common pad materials include cellulosic materials or aspen fiber pads. This large surface area allows for quick evaporation. This technique utilizes the cooling effect produced when water evaporates and cools the air as it is pulled through the pad.Ĭooling pads cool by creating large amounts of surface area that are exposed to air being drawn into the greenhouse by exhaust fans. A “fan and pad” system uses exhaust fans to pull air through evaporative cooling pads. Evaporative CoolingĮvaporative cooling is a tool that can be used to reduce greenhouse temperatures. During the summer months, extra cooling beyond what fan ventilation can provide may be necessary. The greenhouse environment can quickly become too hot for healthy plant production, even in the winter.
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