Greenhouse temperature and humidity control method is very key, these important methods can be referred to

Greenhouse is the current agricultural park facilities agricultural planting common buildings, the construction of the greenhouse but also learn to use. Temperature is closely related to the growth and development of greenhouse vegetables, flower bud differentiation, photosynthesis, transpiration, respiration and transport of assimilated products, etc. Extreme high and low temperature will affect the normal growth and development of plants, and even make the plants die in severe cases.

Soil temperature also has a great influence on the growth of vegetables in the greenhouse, because the level of ground temperature directly affects the absorption of nutrients and water by the roots of vegetables in the greenhouse, and also affects the activities of soil microorganisms. The main purpose of the greenhouse is to cultivate plants during the season when they are not suitable for open field cultivation, so temperature becomes an important factor in the environmental regulation of the facility. Today, I will introduce the common thermal insulation, heating and cooling aspects of a greenhouse.

First, heat preservation technology

The greenhouse relies on absorbing solar radiation during the day to heat up, and at night it is covered with thermal insulation materials to reduce heat loss, so thermal insulation is particularly important. The greenhouse with good thermal insulation performance can effectively reduce the cost and improve the profit.

1. Replace the insulation material on the north wall in the northern region

Since the north wall in the northern region is mainly exposed to cold wind, and the north wall does not affect the overall lighting performance of the greenhouse, we can replace the north wall with a composite board or brick wall with better thermal insulation performance, or fix a layer of thermal insulation cover on the outside of the north wall with a card slot to increase the thermal insulation performance of the north wall.

2. Add extra small arch insulation around the film greenhouse

This kind of insulation style is our most common in the film greenhouse style, that is, around the greenhouse with a small curved arch to support an extra small space, the normal bottom of the small arch is about 1.5 meters away from the wall, at the same time, the arch surface installed film coil, can roll up the film can not affect the side ventilation or the use of fan curtain.

Two, heating technology

The heating methods include brewing heat heating, electric heating heating, water heating heating, steam heating heating, warm air heating, solar energy storage system heating, etc. According to the types of crops and the scale and type of facilities, the solar heating system is used to store the heat energy intercepted by the high temperature air in the upper part of the shed in sunlight underground to improve the ground temperature. When the night temperature is lower than the ground temperature, Energy stored in the soil can be released into the air. Through the application of solar energy storage system, the temperature inside the greenhouse can be raised by 1~2 ℃.

Three, cooling technology

When the outside temperature rises, in order to mitigate the adverse effects of the continuous rise of the temperature in the greenhouse on the growth of crops, cooling measures should be taken. At present, the cooling of the greenhouse is mainly in the following ways.

1. Ventilation to cool down

Open the ventilation outlet or open the ventilation fan for exhaust cooling, which can not only reduce the room temperature, but also discharge moisture and replenish carbon dioxide.

2. Shade and cool down

When the summer light is too strong, you can use old film or old film with straw curtain, shade net and other cover cooling.

3. Roof cooling with water

There is a perforated pipe at the top of the equipment, and the water is sprayed on the roof through the small hole of the pipe, making the indoor cooling.

4. Spray your room to cool down

One is sprayed upward from the bottom of the greenhouse side, and the other is sprayed downward from the top of the greenhouse

5, fan water curtain cooling system

The cooling process of the wet curtain cooling system is completed in its core paper pad. There is a thin layer of water film on the surface of the corrugated fiber. When the hot and dry outdoor air is sucked through the paper by the fan, the water on the water film will absorb the heat of the air and then evaporate into steam, so that the cool and moist air after treatment enters the room. At this time, the indoor can immediately achieve the effect of 5-10 degrees or more.