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What are the applications of high pressure mist spray in greenhouses
First, what are the common greenhouse cooling methods
The greenhouse is a semi-closed system, and the temperature can reach more than 40 C in summer, which seriously affects the growth of crops in the greenhouse. Therefore, high pressure misting equipment can be used to quickly and effectively cool the greenhouse. Therefore, when the internal temperature of the greenhouse is too high, it is necessary to take cooling, and first give you a list of common cooling methods.
1. Natural ventilation and cooling. Suitable for a single small greenhouse, using the gravity generated by the temperature difference between inside and outside the facility to achieve the purpose of air exchange, the cooling effect can reach 3-5 degrees of indoor and outdoor temperature difference. Natural ventilation and cooling mainly consider the local outdoor temperature, the location and number of top Windows and side Windows. Air is injected into the bottom or side Windows. Cold air enters the room, hot air is lifted to the top, and the skylight is discharged. Generally, when the outdoor temperature does not exceed 30 degrees, only natural ventilation can be relied on to achieve the purpose of cooling, but when the outdoor temperature exceeds 30 degrees, it is necessary to cooperate with other ways to cool down.
2, shading and cooling, that is, mainly using shading nets for shading and cooling. The cooling effect depends to some extent on the shading rate of the sunshade net. The shading rate of different types of sunshade nets is different, should be determined according to the type of plants and the needs of plants for sunlight, shading 20%-30%, the room temperature is reduced by 4-6 degrees, and the shading system is divided into external shading system and internal shading system.
3, mechanical ventilation cooling. Suitable for multi-storey greenhouses. The power fan is added to the ventilation population and outlet, so that the pressure difference between indoor and outdoor is generated, and the convection of hot and cold air is formed, so as to achieve the purpose of ventilation and cooling. The forced ventilation of the greenhouse with the exhaust fan is 3~5 lower than the natural ventilation cooling. The mechanical ventilation cooling requires the inlet area of the greenhouse to be large, otherwise it will lead to inconsistent air flow in the greenhouse and uneven temperature distribution. The effect of mechanical ventilation is significant, and the energy consumption is also large, and it is often used in combination with wet curtains to cool down.
Second, high pressure spray system in the greenhouse application
High pressure spray cooling. Also known as cold fog cooling is suitable for well-ventilated greenhouses, using the principle of rapid evaporation and heat absorption of tiny droplets for cooling. The water is processed by the filtration system into the high pressure pump to pressurize (greater than 4 Mpa), and then transported to the special high pressure atomizing nozzle through the pipeline of special materials for release. Formed less than 15 um of fine fog droplets, fog droplets gradually spread throughout the greenhouse suspended in the air, rapid evaporation and cooling, and do not soak the ground.
The high pressure misting cooling efficiency is 95%, so the high pressure misting cooling effect is better. The possibility of crop disease is small because of the small particle size and less water consumption of high-pressure misting droplets. High-pressure misting equipment requires booster pumps and high-pressure copper pipes, the investment cost is relatively high, and the daily operating cost is high; Water needs to be overtreated otherwise it is easy to clog the nozzle.