A combined solar greenhouse with separate enclosed areas

Abstract

The invention relates to a combined solar greenhouse with independent enclosed areas. It includes the rear wall, and also includes an independent closed area, a roller shutter and a roller shutter support frame, a thermal insulation layer, a thermal insulation quilt and a supporting and fixing pipe arranged on the inner side of the rear wall. There are films and thermal insulation materials. The film driven by the film roller and the thermal insulation quilt driven by the roller shutter machine can realize the conversion of the film and the thermal insulation quilt function, which can ensure that the heat source material is heated and stored in an independent closed area during the daytime. Not affected by the temperature of the greenhouse, the heat is released by the film and insulation at night to keep the greenhouse heating up. The implementation of the present invention makes the solar heating method more than double the heating effect of the solar greenhouse in the prior art, the minimum temperature of the greenhouse of the phase change material heating technology can be increased by about 7°C, and the heating time can be maintained for 3 to 4 days .

Description

technical field [0001] The invention relates to a solar greenhouse for cultivation and planting of agricultural products, in particular to a combined solar greenhouse with an independent closed area. Background technique [0002] At present, there are many greenhouse solar back wall heating technologies and phase change processing rear wall heating technologies publicly reported in China, but there are few actual successful cases. On the arch slope, the sunlight does not reach the back wall to the maximum extent; the cost of installing solar energy or phase-change technology heating facilities in the second and three-body brick greenhouses is too high, which is not economical. Therefore, although there are many such papers or patents, neither the solar heating technology nor the phase change heating technology has been well implemented in the actual solar greenhouse. can be better promoted. [0003] Since the temperature of the solar greenhouse is based on the growth of pl...

AI Technical Summary

Problems solved by technology

[0002] At present, there are a lot of greenhouse solar rear wall warming technologies and phase change treatment rear wall warming technologies publicly reported in China, but there are very few actual successful cases. The main reasons are as follows: First, there are defects in the combined greenhouse design. On the arched slope, the sunlight does not reach the back wall to the maximum extent; the cost of installing solar energy or phase change technology heating facilities in the second and three-body brick-walled greenhouses is too high, and it is not economical.

Therefore, although there are many such papers or patents, neither the solar heating technology nor the phase change heating technology has been well implemented in the actual solar greenhouse. can be better promoted

[0003] Since the temperature of the solar greenhouse is based on the growth of plants, the maximum temperature can only be maintained at about 30°C. In the experiment of the solar greenhouse, the phase change technology also chooses the heat storage material with a melting point lower than 30°C, which limits the high temperature. Experiments and applications of heat storage materials in solar greenhouses. In fact, the phase change melting point of many phase change materials is between 50 and 60°C (such as Glauber's salt, paraffin and graphite mixture). If it is maintained above ℃ for a long time, it can melt and absorb a large amount of heat energy. When the atmospheric temperature drops at night, the phase change material will release heat during the slow solidification process, so as to achieve the purpose of continuous heating of the greenhouse; solar greenhouse technology is to set water bags in the greenhouse During the day, the water absorbs sunlight to heat up and store heat. At night, after the greenhouse is sealed, the warm water releases heat to make the greenhouse continue to heat up. However, the high temperature of the solar greenhouse is usually only about 30°C, and the greenhouse needs to be ventilated to cool down after heating up, so the high temperature is maintained for a short time. The heat stored in the water bag will be dissipated quickly, and the temperature of the water bag will soon be the same as that of the greenhouse.

[0004] The currently promoted solar greenhouses are all installed on the arch slope, which directly affects the light and temperature rise of the back wall, which limits the use of phase change materials, resulting in the heat storage and heat storage time of phase change materials can only meet the needs of the greenhouse for one day. heating demand

To a large extent, the application of solar heating technology and phase change materials in solar greenhouses is limited. Even the most successful domestic solar greenhouses using phase change materials can only use 1,000 kg of solar greenhouses in one mu of land. Glauber's salt has a phase transition temperature of 32~35°C, which is about 5°C higher than that of ordinary solar greenhouses. Under normal circumstances, it basically meets the needs of plant growth, but the stored heat energy can only be used for the day. If it encounters continuous rain In snowy days, there is no enough heat energy stored and usable, so we can only rely on a large amount of electricity for emergency, wasting energy

In the patent application "An Assembled Solar Greenhouse with Efficient Daylighting" in May 2021, the inventor proposed a technical solution in which the roller shutter machine is arranged on the north side of the rear wall column, which advances the time for the solar greenhouse rear wall to receive light , the heating of the back wall has been greatly improved, and it has created favorable conditions for the application of solar heating technology and phase change materials in solar greenhouses. However, since the entire greenhouse space is a whole, the temperature must be suitable for the growth of plants. It is impossible to achieve a temperature above 60°C to meet the demand for high heat storage phase change materials, and it is difficult for the solar water bag on the back wall to reach above 35°C. Therefore, it can be said that whether it is solar heating technology or phase change material heating technology For the solar greenhouses of the prior art, they have played a very good role in the heating process during the day, but there is no condition to store enough heat energy to keep the greenhouse continuously warming up at night when the atmospheric temperature is the lowest.

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