Solar hotbed construction technology

The solar hotbed consists of a heat storage pool, a heat transfer path, an exhaust chimney, a heating material, a temperature control hole, a nutrient soil, a wall, and a covered plastic film. It has the characteristics of reasonable structure, reliable technology, easy construction, and convenient management. The dual effect of saving energy and increasing output is a more economical applicability technology. The technology has been popularized and applied in Jiangsu, Shandong and other provinces and it is very popular among the people. First, the design principle The solar hotbed is the use of solar radiation heat energy through the plastic film to increase the air temperature in the bed, due to thermal siphon phenomenon caused by the temperature difference between the inside and outside of the bed, hot air from the thermal storage tank flows through the heat transfer, the bed absorption And store a lot of heat energy, so that the soil temperature significantly increased; the same time bed soil has a heat transfer, hot air through the soil, promote microbial activity, accelerate the decomposition of the heating material, generate a lot of heat, and further increase the bed soil temperature . This is a new type of hotbed that makes full use of solar energy and supplements it with biological energy. 2. Construction and management 1. Bed site: The bed site should be constructed in places with low groundwater level, sunny leewards, no shading before, and convenient management. Ground beds can be built in areas with high groundwater levels and thin soil layers. 2. Specification: The size, length and width of the hotbed, height and height can be built according to the actual conditions of planting needs and geology. The standard bed is 21 meters long and 2 meters wide. 3. Heat storage pool: In the middle of the bed, dig a heat storage pool that is 1 meter long, 2 meters wide (the same width as the bed surface), and about 1 meter deep. For example, the pool of small thermal storage tanks can be reduced accordingly, and the bottom of the pool is filled with a layer of brewing heat. 4. Bed: The two sides of the thermal pool are each 10 meters long. 5, heat transmission: dig 40 cm deep under the bed, after taking flat, dig 5 strands into the heat transfer, each track width of 20 cm, two sideways from the north and the south edge of each 10 cm. The width of the partition wall is 20 cm. The two sides of the road are connected to the thermal storage pool by the end of the thermal storage pool, and the other end is bent inwards and communicates with the two and four heat transmission paths. The two and four heat transmission paths are connected by the end of the heat storage tank and the heat transmission pipe in the middle, and are remitted to one road, leading to a distance of 20 cm outside the wall. The depth of the heat input is 35 centimeters, with a slope of 5/1000. 6. Wall: The north and west sides of the bed are made of earth or brick walls. The north wall is 80 centimeters high. Both sides of the wall are inclined walls that connect the two walls of the south and the north. The south wall is 20 centimeters high. The inside of the wall is black to facilitate heat absorption. Hold the bracket on the wall and cover the plastic film. 7, temperature control hole: the middle of the north-south wall in the middle of the interval of uniform temperature control hole 7, each 20 cm square for ventilation and temperature control. 8. Exhaust Hanger: An exhaust chimney is built outside the side wall of the bed. The diameter of the bottom mouth is 20 centimeters, the diameter of the upper mouth is 15 centimeters, and the height is 1 meter. The bottom is connected with the middle heat transmission channel. 9. Bed making: Spread the foil or hard crop stalks on the heat transfer road, and sprinkle a layer of grass on the straw to prevent the leakage of soil from the leaking soil. The grass will be covered with 10-15 cm thick broilers (livestock excrement, broken grass, wheat bran, etc.) ) Finally, 20 cm thick nutritious soil was laid. 10. Stretching and laminating: Put up the brackets with sticks and bamboo poles, cover them with plastic film and straw, and strengthen insulation.

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