The flower greenhouse fan wet curtain cooling system is currently widely used in flower production greenhouses, and the effect is better, and it is more suitable for the growth of crops. How to properly install the fan wet curtain system in the construction of flower greenhouses is better. Give full play to its effects and make a difference in flower growth?
Principle of action
To understand the principle of the fan: When the outdoor hot air is absorbed through the wet curtain filled with water, the moisture on the wet curtain absorbs heat and evaporates. This reduces the temperature of the air entering the greenhouse. Usually, a wet curtain wall composed of a wet curtain, a wet curtain water distribution system, a water pump and a water tank is continuously constructed along one wall of the greenhouse, and the fans are arranged on the other side of the greenhouse. The wet curtain needs to be kept moist to achieve the completion of the evaporation and cooling process. According to the size of the greenhouse and the area where it is located, a suitable flower greenhouse fan can be installed on the wall of the wet curtain to allow the airflow to smoothly pass through the greenhouse.
The effect of evaporative cooling is related to the degree of dryness of the air, that is, the difference between the wet bulb temperature of the air and the dry bulb temperature. The temperature difference between the dry and wet bulbs of the air varies not only with geographical location and season, but also within 24 hours. Although the change in dry bulb temperature may reach 14 ° C in 24 hours, the wet bulb temperature varies by only about 1/3 of the dry bulb humidity. Therefore, at noon in high-humidity areas, the evaporation system is still able to cool down, which is also required for greenhouse production.
The principle of selection of the wet curtain size is to achieve a better effect of the wet curtain system. Generally, in the production of flower greenhouses, fiber wet curtains of 10 cm thick or 15 cm thick are often used. 10cm thick fiber wet curtain, when the wind speed through the wet curtain is 76m / min, the effect is better; 15cm thick paper wet curtain, the required wind speed is 122m / min.
The choice of wet curtain thickness for flower greenhouse fans depends not only on geographical location and climatic conditions, but also on the distance between the wet curtain and the fan in the greenhouse and the temperature of the flower crop. If the distance between the fan and the wet curtain is large (generally greater than 32 meters), it is recommended to use a 15 cm thick wet curtain; if the cultivated flower reacts quickly to the greenhouse temperature and has a poor resistance to higher temperatures, it is recommended to use 15 cm thick wet. curtain. Conversely, if the distance between the wet curtain and the fan in the greenhouse is small, or if the flower does not respond quickly to temperature, a wet curtain having a thickness of 10 cm can be used. From an economic point of view, a 10 cm thick wet curtain is priced less than a 15 cm thick wet curtain, which is 2/3 of its price. In addition, the larger the wet curtain inlet size, the better. Since the size of the air inlet is too small, the static pressure is increased, thereby greatly reducing the efficiency of the fan and increasing the power consumption.
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