Greenhouse facilities can be used not only in early spring or late autumn to extend garden work. The main thing is the correct temperature in the greenhouse in winter.
A well-designed and well-manufactured indoor facility may well be operated in the winter season. It is enough for this carry out insulation and organize efficient heating.
Classical methods of maintaining temperature
The traditional methods of heating greenhouses include air heating and hot water... An air heating system transfers heat to plants by convection of air.
Its advantage is a very high heating rate of the entire volume of the room. However, when disabled air heater the temperature drops very quickly.
Greenhouses are used as devices for air heating heat guns of various designs. As a source of energy, such convectors can use liquid or electricity.
Many models are equipped with a fan to quickly fill the room with heated air.
In addition, primitive air heating systems in the form of a metal pipe do not lose popularity. Its upper end is horizontally inserted inside and has a plurality of openings for the passage of heated air.
Its lower end is located outdoors and is installed vertically. A fire is made under the socket of the vertical part of the pipe, and the heated air begins to flow through the pipe into the room.
Water heating works by supplying heated water to a system of pipes and radiators located in a greenhouse. Its advantage is its high heat capacity, which allows the heated water to give off heat for a long time even after the heating device is turned off. And also the fact that it is quite possible to do water heating of the greenhouse with your own hands.
The disadvantage is the complexity of calculating the power of the heater, as well as the number and characteristics of radiators. The task is also complicated by the amount of equipment required, which is not the least expensive.
For hot water heating, heaters operating on any type of fuel can be used:
- firewood or coal;
Gas heating implies the organization of the gas supply for the heater.
It can be done in two ways: by laying a gas pipeline and using gas cylinders.
The second way, i.e. use of cylinders, in summer cottages and household plots is often more rational.
It does not require a significant amount of work for laying a gas pipeline and a lot of permits.
The use of a stationary gas pipeline is beneficial only if gas supply has already been organized in a country or residential building.
Greenhouse gas heating systems can be classified according to the method of transferring thermal energy:
- water pipe heating;
- infrared heating;
Reference:This option is beneficial only if it is possible to lay a heating main from a stationary gas water heating system in a residential building to the greenhouse.
Infrared gas heaters emit a stream of infrared radiation from heated surfaces. Such emitters can be in the form of tubes, or ceramic or steel plates. In any case, the combustion of the gas takes place inside the device. However, they will have different smoke exhaust systems.
Tubular heaters need to build their own chimney. Plate variants can throw combustion products directly into the greenhouse with their subsequent removal through the ventilation system, which is sometimes not entirely safe.
IMPORTANT: It is unacceptable to use gas equipment without a ventilation system. If all the oxygen in the room burns out, the combustion will stop and the room can be filled with explosive gas.
Air gas heaters have an open burner. The air heated in the flame rises to the ceiling, from where, as it cools, it is distributed throughout its volume.
This heating method is very effective, however, in order to maintain the flame and comply with safety rules, the greenhouse must have an effective supply ventilation system.
Heating the greenhouse with a heat gun... In this version, the gas air heater is additionally equipped with an electric fan. This greatly increases its efficiency, but requires the connection of the power supply line.
Electric heating, as well as lamps for greenhouses for heating, is the most technically simple way of heating. It can be carried out with devices of two types.
- Electric heat guns. The air in them is heated with the help of high-resistance wire spirals. A fan is installed in the heat gun, so it can be used to warm up the entire volume of air in the room in a short time.
- Convectors. Heating in them occurs inside the body of the device. Thermal energy is transferred through metal or oil conductors to the outer casing. The energy is emitted in the infrared range. With all the simplicity of this solution, the use of electric convectors in greenhouses is not very profitable, since in conditions of high humidity, the service life of the devices will be too short. In addition, any classic heating electrical appliances have a high level of energy consumption.
Heating the greenhouse with wood. It is very easy to equip such a winter heating system. The classic and familiar to everyone potbelly stove for a greenhouse will help. The advantage of this option is the low cost of fuel and a fairly high efficiency.
The disadvantage of a potbelly stove is its flammability. The place of installation of the device must be lined with non-combustible materials. In addition, thermal insulation of the chimney at the point of its outlet to the roof will also be required.
Look at the photo: infrared greenhouse heater, electric greenhouse heating and air heating
Modern heating methods
Recently, heating systems that were previously used only in residential buildings are increasingly common in the greenhouse industry. One example is a heating cable for greenhouses, used in apartments for underfloor heating.
Dignity underfloor heating cables is the heating method itself - through heating the soil. Here, first of all, the soil heats up, which has a beneficial effect on the vital activity of the root system of plants.
Reference: heating the greenhouse from the bottom up is the most energy efficient, since warm air does not have to cycle through the entire volume of the room, as is the case with other types of heating devices.
Another advantage of cable heating is compactness of the system. Hermetically packed soil heating cables are placed directly in it and do not eat up the space of a compact structure.
Infrared electric heaters - another novelty for indoor areas. They are placed on walls or under the ceiling. Greenhouse infrared heating is gaining popularity and here's why.
Infrared radiation from hot heating elements heats up the walls and soil, as well as the plants themselves. The disadvantage of this solution is not the highest efficiency.
There is also such a way to use the heating cable: laying tape heating... Having a principle of operation and placement in greenhouses similar to the cable, tape heaters differ in design, since they are made in the form of tapes or cloths.
A heating method using powerful electric incandescent lamps is also acceptable.
In addition to heat, such a system will produce a strong luminous flux, which is very beneficial for plants in a short winter day. However, electricity consumption in this case will be very noticeable.
Greenhouse geothermal heating. It is based on the fact that at a considerable depth, the temperature is stable throughout the year and is always positive.
To deliver this heat inside the greenhouse, special heat pumps are used to pump water or air. The injected cold heat carrier deep underground heats up, rises back and gives heat energy to consumers.
The advantages of geothermal heaters include the following:
- minimum energy consumption required only to ensure the pumping of the coolant;
- long service life of several tens of years;
- almost do not require maintenance;
- on very hot days, the system can act as a greenhouse refrigerator without any modification.
The main disadvantage of the geothermal system is the complexity of design and survey work and technical calculations. In addition, it is not possible to arrange such heating on all types of soil.
How to heat a greenhouse cheaply
The choice of the cheapest heating method depends on several factors. First, from readiness for complex engineering calculations and large-scale construction. In that case, the option of geothermal heating would be optimal.
Secondly, the presence of a connected gas pipeline on the site... If it is available, then gas heating will be the cheapest.
Thirdly, the cost of work on the installation of the heating system and its maintenance. If you plan to do everything with your own free hands, then it makes sense to opt for electric heating.
It is not very difficult to organize an efficient, inexpensive and not the most difficult-to-use greenhouse heating system. It is enough just to study the principle of operation of the most common solutions, take into account your own capabilities and choose whether it will be infrared heaters for greenhouses, infrared lamps or tape heaters.
Watch the video: how to heat a greenhouse with wood