Facilities agriculture has developed rapidly in China, and greenhouse production has also achieved annual production. However, due to climate conditions, the environmental control in greenhouses in winter is more important. Relevant studies have shown that the heat loss of greenhouse surrounding structures is the main part of the greenhouse heat loss. The heat exchange between the surrounding greenhouse protection structure and the outdoor air will generate heat loss. The gaps between the side windows installed at the greenhouse and the joints of the cover materials will affect the greenhouse. The tightness has a great influence on the insulation performance in the greenhouse. In order to provide the basis for the winter energy-saving production of greenhouses, the effect of thermal insulation in greenhouses was studied by installing insulation curtains around the greenhouse and covering with double-layer insulation curtains. The application of the greenhouse baby in the greenhouse is also very effective, and has a guiding role in the related production development.
The monitoring of the greenhouse baby found that with the decline of the outdoor temperature, the temperature in the greenhouse also decreased, the temperature in the eastern greenhouse decreased rapidly, and the temperature of the surrounding greenhouse and the overall temperature decreased after the western greenhouse covered the surrounding insulation screen and the top double insulation screen. Slower than the eastern greenhouse. In the East greenhouse, the single-layer insulation curtain covering the top can make the indoor temperature about 2°C higher than that of the outdoor, and the temperature around the middle and the middle does not change much; the western greenhouse can cover the indoor thermal temperature by covering the surrounding insulation screen and the top double insulation screen. About 8 degrees Celsius, about 5 degrees Celsius higher than the single layer covering the east of the greenhouse, the temperature increase in the middle of the greenhouse is the largest. At the external temperature of -2 degrees Celsius, the central greenhouse temperature reaches 6 degrees Celsius. When the outdoor temperature changes at night during sunny days, the change of temperature in the greenhouse can be significantly slowed by the surrounding insulation curtain and the double-layer insulation curtain on the top, which provides a good thermal insulation effect.
Through the monitoring of the greenhouse baby, building a small shed in the greenhouse can further increase the temperature. After covering with the surrounding enclosure and the double-layer insulation curtain, building a small shed can make the temperature in the shed reach more than 8.5°C, basically meeting the winter vegetables. The growth of crops. There is only one layer of glass around the greenhouse, and due to the installation of side windows, the tightness of the greenhouse will be reduced, affecting the insulation performance of the greenhouse. For example, adding a layer of insulation curtain enclosure structure can significantly increase the temperature in the greenhouse and reduce the greenhouse in winter. The marginal effect. Rolling the insulation curtain by means of a film-rolling device during the day does not affect the light transmission in the greenhouse.
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