What are the commonly used heating methods for greenhouses?
Glass greenhouses in northern my country need to be heated in winter, otherwise they cannot be produced in winter. The length of the greenhouse heating time is different. The heating time in Northeast China takes about 5 to 6 months, and in North China it takes 3 to 5 months. Planting flowers or raising seedlings in the south also requires heating or temporary supplementary heating.
1.Hot water heating: The hot water heating system is composed of three basic parts: a hot water boiler, a tubular water heater and a heat dissipation device. The working process is to heat water with a boiler, then pressurize by a water pump, and the hot water is supplied through heating. The pipeline supplies the radiator in the greenhouse, which is heated by the radiator to increase the temperature of the greenhouse, and the cooled hot water returns to the boiler to reheat and repeat the cycle. The hot water heating system operates stably and reliably, and is currently a common heating method for glass greenhouses.
2. Ptc Air Heater: The hot air heating system is composed of a heat source, an air heat exchanger, a fan and an air supply duct. The working process is: the heat provided by the heat source heats the air ventilator, and the fan is used to force part of the air in the greenhouse to flow through the air heat exchanger, so as to continuously circulate and heat the greenhouse. The heat source of the hot air heating system can be oil, gas, coal-burning device or electric heater, or it can be hot water or steam. The heat source is different, the hot air heating equipment installation form is also different. The air heat exchanger of the steam, electric heating or hot water heating system is installed in the greenhouse and cooperates with the fan to directly provide hot air. Oil and gas heating devices are installed in the greenhouse, and the flue gas after combustion is discharged into the greenhouse. Coal-fired hot blast stoves-generally larger in size and dirty in use-are generally installed outside the greenhouse. In order to make the hot air evenly distributed in the greenhouse, a ventilator sends the hot air into the ventilation duct.
3. Electric heating pad: The most common electric heating method is to bury the geothermal wire in the ground to increase the ground temperature, and it is mainly used in the greenhouse to raise seedlings. Electricity is a clean and convenient energy source, but electric energy is a secondary energy source, which is relatively expensive, so it can only be used as a temporary heating measure for a short period of time.
