Method of cooling greenhouse under high temperature
1. Ventilation
Greenhouse ventilation is a direct and effective way to reduce the temperature in the shed. By timely opening the roof and the vents in front of the shed, good air convection can be formed, and the temperature can be effectively reduced. In order to avoid dehydration and wilting of vegetables due to sudden cold wind, ventilation should be carried out gradually, from small to large, so as to gently reduce the temperature. At the same time, the vent should be equipped with a pest control net to prevent the invasion of pests.
2. Lay sunshade nets
The use of sunshade net can effectively block part of the sun and reduce the temperature in the shed. The use of sunshade nets should avoid all-day coverage, so as not to affect plant photosynthesis. Reasonable use time is 10:30 am to 2:30 PM or so, while ensuring that there is a certain gap between the sunshade net and the shed film, in order to facilitate air circulation.
3. Splash mud
Splashing mud can also reduce the temperature in the shed, but the drawback of splashing mud is that it is easy to spray uneven, and it is easy to be washed away after rain. If the spray is too thick, it is easy to form a low-light hazard for a long time. In order to prevent the mud from being washed by rain, an appropriate amount of flour can be added to improve its anti-erosion ability.
4. Water to cool down
It is recommended to take small water frequent watering, but pay attention to two points, one is not in the noon high temperature for sudden watering, the second is not flooding watering, summer watering cooling with small water frequent watering method is best, watering time is best to choose morning or evening.
5. Lay straw
First pour the water in the shed to wet the shallow soil, and then cover the rows of vegetables with a layer of straw. Straw straw can absorb the heat in the soil during the day, and reduce the evaporation and loss of water in the soil, so as to achieve the effect of cooling and humidifying.
6. Spray coolant
Spraying cooling agent is a cooling method, by spraying cooling agent to reduce the temperature in the shed, the use should be diluted according to the different requirements of vegetables to light, choose different spraying forms.
7. Spray the roof to cool down
Roof spraying cooling is a cooling measure used by many farmers, but it depends on their own water resources. Spray system design is reasonable or not, directly affect the effect of water saving, generally speaking, the spray system mainly includes: water source, pressure (control) equipment, pipeline and nozzle.
8. Atomized cooling
The principle is to use a pressurized pump to pressurize water, through the high pressure pipeline to the high pressure nozzle atomization, forming fog, fog in the shed quickly evaporated, so as to increase the air humidity, reduce the ambient temperature.
9. Fan wet curtain cooling system
The cooling system of the fan wet curtain is the use of water evaporation to cool down, but it also needs to be equipped with corresponding equipment. When it is necessary to cool down, the fan can be started, and the air in the film greenhouse will be forcibly extracted, resulting in negative pressure; At the same time, the pump will hit the water on the opposite wet curtain wall, so that the water evaporates, the cold air flows through the film greenhouse, absorbs the indoor heat, and is discharged by the fan, so as to achieve the purpose of cooling system.
10. Water cooling air conditioning
Water-cooled air conditioning is the use of mechanical refrigeration devices for refrigeration cycle, used to cool the film greenhouse air. This type is not very suitable for greenhouse production and energy consumption, and is more suitable for large-scale agricultural sightseeing parks, leisure science museums, ecological restaurants and other types of film greenhouse.
