Many owners of summer cottages, for sure, would not give up the possibility of harvesting all year round. Unfortunately, in most European regions the climate is such that this desire looks like a utopia. However, arranging a reliable greenhouse equipped with a productive heating system can be a solution to this issue. Recently, gas heating of a greenhouse is considered the most common, which is explained by the appearance on the market of modern technology — IR emitters and heat guns-convectors.
The traditional approach to the use of gas in order to ensure the optimal microclimate of greenhouses involved the creation of a thermal circuit, the basis of which is a gas boiler. This method is effective and reliable, but it is not very suitable for a small private greenhouse, financial investments turn out to be impressive, it is necessary to form complex pipe layouts, install stop valves for fine tuning and adjustment of functioning. In addition, such a method of gas heating involves obtaining numerous certificates and permits, the technique is classified as potentially dangerous, and therefore approvals from regulatory authorities are required.
As a result, this scheme is relevant only if we are talking about a large commercial greenhouse with an area of several hundred square meters. Then we can talk about the justification of all investments, they are quickly compensated. Creating a separate thermal circuit for a small agricultural structure is only appropriate if the owners use a gas boiler to heat the main cottage, it is possible to make a branch to the greenhouse.
Traditional mobile equipment
Gas heating a private greenhouse is more economical if the owners use portable devices.
The following modifications are presented on the modern market:
- Heater with open type burners. The design assumes the presence of a thermostat, a main burner and an auxiliary device. Both a cylinder and a line are used as a power source. The flame of the burner heats the air, which naturally begins to rise to the roof, after which it settles evenly, raising the temperature in the surface zone, that is, exactly where the plants are located. The main disadvantage of the technique is that the combustion process reduces the oxygen content in the air, and this is detrimental to crops. This phenomenon can be compensated by equipping a simple ventilation system. Not far from the heater, a hole is punched in the wall with a diameter of at least 5 centimeters. A PVC pipe is inserted into the hole. To protect against insects and rodents, it is recommended to install a metal mesh with small cells.
- Heating with gas convectors. The installation of this technique is carried out on the walls, the design implies the presence of a sealed combustion chamber based on steel or cast iron. Inside the chamber is the main burner, as well as a closed heat exchange circuit. The operation of the device is controlled by automation, the main or bottled gas enters the main burner, due to which the internal heating of the body occurs. The heat exchange circuit transfers energy inside the greenhouse. Compared to a conventional open heater, this device independently takes in air and exhausts combustion products, that is, the level of oxygen in the agricultural building does not fall, and the need for additional ventilation pipes is eliminated. The device automatically corrects the temperature in accordance with the set values, safety is guaranteed by a locking mechanism that cuts off the fuel supply in situations with drops in thrust or pressure. Such a heater is sometimes additionally supplied with a fan. Modernization increases efficiency, the air in the greenhouse warms up much faster, but there is a dependence on the electricity supply.
Heating with infrared burners is considered the most advanced, gentle and economical way. The principle of operation of infrared technology is based on electromagnetic radiation produced by heating elements that heat up during the combustion of fuel.
See also: do-it-yourself water heating of a greenhouse.
Devices are divided into two groups:
- “Dark” units are equipped with tubular heating elements, the maximum temperature of which is 600 degrees;
- “Light” devices are equipped with mesh heating elements, or ceramic-based plates, the temperature of which can exceed 600 degrees.
Do not forget to read the material on heating greenhouses with your own hands.
The reason for this division into groups is the ability of “light” burners to produce light in the visible spectrum, like ordinary incandescent lamps. However, 60 percent of the total heat flux comes from infrared radiation.
If we consider the design features, then the “dark” devices are based on an element elongated in one direction, which is explained by the tubular shape of the heating element. Additionally, a pipe is mounted for the removal of combustion products. “Light” IR analogues do not have their own chimney, combustion products are thrown into the greenhouse, and therefore it is necessary to additionally equip the building with ventilation ducts.
The advantage of the technique operating in the IR spectrum is that with its help it is easy to organize local heating zones, to prevent the temperature in areas where the most heat-loving crops grow. Practice shows that the devices are most effective when germinating seeds that also need an abundance of thermal energy.
Thus, heating a private greenhouse with a gas gun is not the only scenario when using this type of fuel. A competent approach to the formation of the scheme, taking into account all kinds of factors, attention to modern devices — all this will help to establish a system that will not have weaknesses. Taking into account the fact that gas in EU is significantly cheaper than electricity or solid fuel, a well-equipped scheme can pay off in a couple of seasons.