When the temperature drops to zero in extreme weather, what are the quick ways to raise the temperature?

In winter, vegetables grown in greenhouses occasionally encounter extremely cold weather, and rainy and cloudy weather is also common. Leaf vegetables have certain cold tolerance, while eggplant vegetables have higher requirements on temperature. When the temperature is low, it will stop growing, and in severe cases, there will be freezing damage. How to raise the temperature of the greenhouse is a difficult problem every year. The key is whether the old problems can be solved by new methods.

There are many heating devices now, and the structure of the greenhouse is different from the local weather. Choose a heating method with good heating effect and saving money.

First, the commonly used heating methods

Cover the quilt, paste the second layer of film, alcohol stove, fluorescent lamp, etc. These are common heating methods, which are used in both cold shed and warm shed. It's cheaper to use alcohol stoves and fluorescent lamps. The greenhouse with 78% is about 10 yuan a night, and the warming effect is not bad. In general weather, you can choose one of these two ways to warm up.

Second, the new heating equipment has raised the temperature.

Extreme weather will inevitably occur in winter, especially when the minimum temperature reaches zero at night, or some greenhouses are large in area, and some conventional heating methods can not heat up quickly. At this time, we need to use other heating equipment, such as heating blocks, heaters and electric boilers for heating.

1, heating block

Generally, greenhouses need three or four heating blocks to heat for one or two hours, which is suitable for small greenhouses, and it costs twenty or thirty yuan a night. Compared with heating corncob, burning warm blocks is a safe method, which does not affect crop growth, but it is not suitable for tall greenhouses. Even if the dosage is increased, it may not achieve the effect of warming up, but it will cost more.

2. Heater

Some air heaters are burned by diesel oil, and the sizes of air heaters are different. For example, the specification of 30 kilowatts can heat up by 8℃ in one night, and the heating speed is also very fast, and it can heat up within one hour.

However, using diesel oil also has disadvantages. Burning a lot of oil will release carbon dioxide and carbon monoxide. Only oxygen and carbon dioxide are beneficial to plant growth in greenhouse, and excessive carbon monoxide will also inhibit plant growth.

There is also a heater that uses electricity and heats up quickly. 20 kW requires 20 kWh per hour, which varies in size and how much electricity is consumed.

Combining the advantages and disadvantages of air heater, it has the advantages of fast heating speed and high consumption. When extreme weather comes, it is suitable to use this method to heat up quickly without producing a lot of harmful gases.