Development of Ventilation-Evaporation-Temperature-Humidity Charting Software for Evaporative Cooling of Greenhouses

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  • 蒸発冷却法用VETH線図ソフトウェアの開発
  • ジョウハツ レイキャクホウヨウ VETHセンズ ソフトウェア ノ カイハツ

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Abstract

Evaporative cooling through the use of a fogging system has recently become more common in commercial greenhouses. Since evaporative cooling is a well-understood physical phenomenon, air temperature and relative humidity inside the greenhouse under evaporative cooling can be estimated if conditions such as the outside dry and wet bulb air temperatures, ventilation rate, absorbed solar radiation and evapotranspiration rate inside the greenhouse are available. However, the calculation process is complicated and so is generally not used.<br>The Ventilation-Evaporation-Temperature-Humidity (VETH) chart, which shows the relationship between the ventilation rate of the greenhouse, the evapotranspiration rate inside the greenhouse, the dry bulb temperature inside the greenhouse and the relative humidity, was devised by Mihara (1980). The VETH chart is useful in the design of evaporative cooling operations, because the relationship between the four factors (ventilation, evaporation, temperature, and humidity) can be easily determined from the chart. However, when the conditions, such as outside dry or wet bulb air temperatures, or absorbed solar radiation change, it is necessary to redraw the VETH chart, and drawing the chart by hand is quite difficult. Therefore, a suite of three personal computer software applications were developed. One application can draw a VETH chart, the second can calculate the necessary water spraying rate and the third calculates the ventilation rate of the greenhouse via the heat balance method. Such software packages are useful as tools in the design and operation of evaporative cooling systems.

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