Temperature and Humidity Environments inside a Naturally Ventilated Greenhouse with the Evaporative Fog Cooling System
Temperature and Humidity Environments inside a Naturally Ventilated Greenhouse with the Evaporative Fog Cooling System
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采用蒸发雾冷却系统的自然通风温室内的温湿度环境
DOI：
10.2525/ecb1963.36.97
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
Hirosi Nakajima
中科院分区：
文献类型：
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作者：
M. Hayashi;Takayuki Sugahara;Hirosi Nakajima
在夏季晴天对自然通风蒸发雾风冷温室内的温湿度环境进行了测定。从安装在温室内地板上方2 m处的喷嘴间歇地喷射雾（喷射时间：每隔3或4分钟喷射1分钟）。温室的侧部、端部和顶部通风器保持打开，以在冷却期间增加空气流通和雾蒸发。实验结果总结如下。(1)在喷雾开始后1分钟内，车内空气温度降低到车内湿球温度附近。(2)喷雾降温温室内，喷嘴下方（植物生长区）的垂直温差在1 ℃以内，地面以上1.5m处的水平温差在2.5 ℃以内。(3)喷雾对番茄叶温的降低幅度小于气温。随着温室内空气饱和亏缺的增加，温室内叶温与空气温差减小。(4)根据这些测量结果，当雾充满温室大气时，空气以每分钟10°C的速度迅速冷却，建议使用小型传感器，例如热容量小的小直径热电偶，以防止测量空气温度时出现错误。
Temperature and humidity environments inside an evaporative-fog air cooling greenhouse with natural ventilation were measured on a clear day in summer. The fog was sprayed intermittently (spraying time: 1 min at 3 or 4-min intervals) from nozzles installed 2 m above the floor inside the greenhouse. The side, end, and roof ventilators of the greenhouse remained open to increase air circulation and fog evaporation during cooling. The results of the experiment are summarized below. (1) The inside air temperature reduced to approximately the inside wet bulb temperature within 1 min after the start of fog spraying. (2) The vertical air temperature differences below the nozzles (plant growing zone) were within 1 °C, and the horizontal air temperature differences at 1.5 m above the floor in the greenhouse cooled with fog spray system were within 2.5°C. (3) The reduction of leaf temperature of the tomato plant by fog spray was smaller than that of air temperature. The difference between the leaf temperature and the air temperature inside the greenhouse decreased as the saturation deficit of the air increased. (4) From these measurements, when fog fills the greenhouse atmosphere, the air is rapidly cooled at a rate of 10°C per min, a small sensor, such as a small diameter thermocouple in which heat capacity is small, is recommended to prevent errors in measuring air temperature.