Introduction:
In the northeast of China, there are two types of greenhouse, solar greenhouse and multi span greenhouse, which are planted in winter. In the greenhouse, the basic heating equipment is the traditional way of water heating, solar greenhouse is generally designed as radiator. The internal heating equipment of multi span greenhouse is generally finned tube, which has good installation and large heat dissipation area. These are permanent heating equipment, and temporary heating equipment can be added in case of sudden bad weather.
General situation of greenhouse in Northeast China
The characteristics of greenhouse design in Northeast China are not only the large snow load coefficient of greenhouse, but also the thermal insulation and heating mode of greenhouse. Snow load coefficient is directly related to whether the greenhouse will collapse, and heating and insulation are related to the growth of crops.
【1】 Heating design of solar greenhouse in Northeast China
The solar greenhouse has very good heat preservation measures in Northeast China, and the reason why there is solar greenhouse in Northeast China. Its core of insulation coefficient is that it has super insulation three walls, which are thicker than those in other areas, and the insulation materials are also thick. Another insulation material is the front thermal insulation quilt of sunlight greenhouse, which is generally used waterproof wool felt, double-sided waterproof layer, and high-quality wool felt is selected in the middle. We are also very clear about the thermal insulation of wool felt.
【2】 Heating design of linkage greenhouse in Northeast China
In Northeast China, double glass or double sunlight plate is used as the covering material for the greenhouse. If the facade of the greenhouse is glass, it is made of double-layer vacuum tempered glass, which has a very good heat insulation effect. The top is basically 8 or 10 mm of the sun plate, for the insulation is also very good. Another kind of sunshine board greenhouse is used in a series of greenhouse, all of which are 8 or 10 mm, which are very good for thermal insulation. But the same place of the two kinds of greenhouse is to adopt internal insulation measures, and there is insulation layer on top and around them. Their switch mode is electric.
Greenhouse permanent heating facilities
As the permanent heating mode of greenhouse, it is mainly to ensure the smooth production of greenhouse in winter. They are basically designed according to the daily weather conditions of the relevant places.
【1】 Solar greenhouse heating equipment
The position of installing heating equipment in solar greenhouse is mainly on the back wall, and water heating is the best for the design of heating effect and principle. The radiator is used to dissipate heat by radiation, and the temperature in the whole greenhouse is basically the same, which will not cause excessive local temperature, which is not conducive to the growth of crops. The number of radiators installed is generally determined according to the local temperature. If the investment is not bad, more radiators can be installed. In the case of special weather conditions, the warming effect is relatively better.
【2】 Heating equipment of multi span greenhouse
In the whole multi span greenhouse industry, the heating equipment basically uses fins, and now there are also fan coil units. Compared with the fin heating method, it is more suitable for planting greenhouse. There is no problem for the fan coil heating itself, but the hot wind will affect the growth of crops nearby. The installation position of fins is around the multi span greenhouse and in the middle corridor of the greenhouse, so as to ensure that the overall temperature inside the greenhouse is uniform, which is suitable for the growth of crops.
Temporary heating equipment in Greenhouse
For the temporary heating equipment, the main solution is the sudden weather conditions. In Northeast China, the occasional gale and Blizzard will bring certain pressure to the traditional way of heating. At this time, the use of temporary auxiliary heating is more conducive to the smooth transition of the greenhouse.
【1】 Hot air fan heating
At present, there are two kinds of hot air fans commonly used in the market: electric hot air fan and fuel hot air fan, both of which can achieve heating effect. But I prefer to use the electric hot air blower, because when the electric hot air blower is used in the greenhouse, there is no smell, and the fuel oil is different. There will be smell of fuel oil, which may affect the growth of crops. Generally, the use of hot air fan for heating is temporary heating, which is very suitable for special cold weather. Generally, the power of hot air fan is very large, and the energy consumption is very serious. There is no long-term use of hot air fan for greenhouse heating.
【2】 Greenhouse warming block
For the greenhouse warming block, some people are still unfamiliar, its main components are the wood charcoal powder, corn powder, combustion aids, smoke-free agent and other synthetic combustion blocks, heating method belongs to open fire heating. Especially when cold current comes, room temperature gradually decreases, and low room temperature is unfavorable for crop growth, so measures of increasing temperature are needed. The heating block can be ignited to increase the temperature rapidly, and the temperature of the flame is about 500 degrees. Generally, 3-5 pieces per mu of land can increase the room temperature by about 4 degrees. It is important to pay attention to ventilation when using the heating block, because whether the combustion will be large amount of carbon dioxide, which is not conducive to growth. Also pay attention to fire prevention, and compare the heating block with open fire mode, and keep away from inflammable products。
Conclusion:
There is a simple understanding of the design, heating design and thermal insulation design of the Northeast greenhouse itself. The main reason is that the weather in Northeast China is very cold, and the snow will not melt after snow. This brings a great test to the heating and heat preservation of the greenhouse itself, especially whether the greenhouse will be crushed by snow. In the case of extremely cold weather, temporary heating equipment can be used to increase the temperature.
Post time: Jul-26-2021