The best time to measure wet bulb temperature to calculate the potential cooling performance of the evaporative cooling system is in the afternoon. It is important to remember that electronic humidity meters frequently drift out of calibration and should be checked against standards on a regular basis.
#What is a pad system software
Software packages are also available to calculate wet bulb temperatures. Even if a humidity meter does not display wet bulb temperature, tables and graphs known as psychrometric charts are available to calculate wet bulb temperature based on the dry bulb temperature and relative humidity. Some electronic humidity meters have an option to display wet bulb temperatures. However, wet bulb temperature is a more useful measurement for evaporative cooling systems because it directly determines the temperature to which air can be cooled by evaporative cooling alone. Handheld electronic humidity meters that display relative humidity are more convenient than wet bulb psychrometers. Relative humidity is a more common term for measuring the amount of moisture in the air. A sling psychrometer is mounted on a swiveled handle and whirled rapidly, while an aspiration psychrometer uses a small fan to provide air movement. The difference between a sling psychrometer and an aspiration psychrometer is the way the airstream is provided. The other thermometer is exposed directly to the airstream and measures the dry bulb temperature. As the water in the wick evaporates, the temperature of the thermometer decreases to the wet bulb temperature. The end of one thermometer is covered by a wetted wick. Wet bulb psychrometers consist of two thermometers exposed to the same airstream.
Wet bulb temperatures can be determined by checking with your local weather station or by investing in an aspiration psychrometer, a sling psychrometer, or an electronic humidity meter. Unlike dry bulb temperature, wet bulb temperature is an indication of the amount of moisture in the air.
#What is a pad system skin
It is the temperature you feel when your skin is wet and exposed to moving air. Wet bulb temperature is the lowest temperature that can be reached by the evaporation of water only. It is the temperature measured by a regular thermometer exposed to the airstream. We usually think of dry bulb temperature as air temperature. Two temperatures are important when dealing with evaporative cooling systems-dry bulb temperature and wet bulb temperature. As water evaporates, energy is lost from the air, causing its temperature to drop.
Evaporative CoolingĮvaporative cooling is a process that reduces air temperature by evaporation of water into the airstream. Air conditioning or refrigeration systems can be used, but their installation and operating costs are usually prohibitive. Evaporative cooling is the most common method for reducing the temperature inside a greenhouse, but it has limitations in our hot, humid climate. Such high temperatures reduce crop quality and worker productivity.
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In Florida, greenhouse temperatures can easily exceed 100☏ during the summer if they are not equipped with active cooling systems.
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