A greenhouse is a small-sized structure that protects cultivated plants from adverse weather conditions. The differences between a greenhouse and a greenhouse are:
- height – no more than 1.3 meters;
- lack of doors;
- the structure is used for growing seedlings, not adult plants.
Greenhouse ventilation provides plants with a favorable microclimate: the required range of temperatures and humidity.
Greenhouse ventilation requirements
Proper ventilation of greenhouses provides plants with warmth, high humidity and fresh air. The optimum air temperature in the greenhouse depends on the type of crops grown, but it should not fall below +15°C. In early spring, this is provided by the greenhouse ventilation system.
Why do you need proper greenhouse ventilation?
- So that the plants do not die from overheating.
- So that bacteria do not develop, because of which the seedlings get sick and rot.
- To ensure that the temperature in the greenhouse is uniform and does not exceed acceptable limits.
- So that plants quickly adapt to open ground.
When designing a greenhouse, it is necessary to take into account the building codes and rules of SNiP 2.10.04-85 “Greenhouses and greenhouses”.
Remember that 40% of the total amount of heat that the ventilation of the greenhouse provides during heating must be supplied to a zone 1 m high from the soil.
Greenhouse ventilation: natural and forced
natural ventilation greenhouse does not require additional equipment. It occurs due to uncontrolled air exchange. This explains the disadvantages of natural greenhouse ventilation:
- it is impossible to control the intensity of air exchange and temperature;
- dependence on weather conditions.
The advantage of this type of ventilation is its zero cost.
Forced ventilation greenhouse works automatically. There are three main types of forced ventilation of greenhouses:
- Bimetallic. It is ineffective with inaccuracies in technological calculations.
- Hydraulic, is only suitable for warm climates.
- Electric. Effective but costly.
Combined greenhouse ventilation is more commonly used. When heating in winter, the fans are activated. In summer, the combined system allows you to save on electricity.
Solar energy for ventilation of greenhouses
An economical way to ventilate a greenhouse is to use solar energy. In Europe and Asia, the use of alternative sources is available to both housewives and manufacturing companies. But in Russia, solar energy is just beginning to be mastered: for more than 15 years there has been no device for household needs of people. Now, this equipment there is.