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Solar greenhouses are generally not heated at night, but use the solar radiation stored indoors during the day. Therefore, in the production of vegetables in Solar Greenhouse in winter and spring, it is very necessary to cover the cliff in front of the greenhouse at night. At present, the commonly used thermal insulation and covering materials for solar greenhouse mainly include straw mulch, paper quilt, cotton quilt and non-woven fabric.
1、 Straw mulch
At present, straw mulch is the most used, followed by Pucao, runcao, Pucao plus reed brick and other grass mulch woven by mountain grass. Straw mulch is characterized by good thermal insulation effect, convenient material acquisition and low cost. It is the main thermal insulation material for the front roof of solar greenhouse at present. The thermal insulation effect of grass repair is generally 5 gas-6t, but the actual thermal insulation effect is very different due to different weaving raw materials, thin grass cover and vegetable density. The effect of straw mulching with Pucao and reed is better than that of straw mulching, and the temperature can be increased by 70c.10 ℃.
2、 Paper quilt
In order to make up for the lack of thermal insulation capacity of straw mulch in severe winter, paper quilt can be covered under straw mulch. The paper sill is usually made of 4-layer cement bags or 4-6 layers of new kraft paper 'sewn into a thermal insulation material similar to the size of straw cover. Its heat preservation effect can reach about 7 ℃, and under the same conditions, the heat preservation ability of a layer of straw mulch is HIO tun. Therefore, if the paper quilt is used together with straw mulch, a good thermal insulation effect can be obtained.
3、 Quilt
It is made of cotton cloth or packing cloth and cotton wadding (it can be made of relatively cheap fancy cloth or short sealed cotton flint). The quilt is characterized by good thermal insulation performance. It can be stacked at 10 ℃ in high and cold areas, and the thermal insulation capacity is higher than that of straw mulch. Another feature is that it has a long service life. If it is well kept, it can be used for 6-7 years. However, it has high cost and large secondary investment.
4、 Non woven fabric
It is a kind of cloth like material made of polyester fiber without weaving process and hot pressing fiber. According to the length of polyester fiber, fork can be divided into long fiber non-woven fabric and short fiber non-woven fabric. According to the grams per square meter, the long fiber non-woven fabric used for thermal insulation coverage on the facility greenhouse can be divided into various specifications, such as 20g / square meter, 30g / square meter, 40g / square meter and 50g / square meter. The greater the grams per square meter, the better the thermal insulation effect. Mantra spinning cloth has the functions of energy saving and heat preservation, frost and frost prevention, reducing dew condensation in the shed, cooling and disease prevention, shading and dimming, increasing production and income. It is widely used in vegetable production, but when it is used together with solar greenhouse and plastic film greenhouse, it is mainly proud of the internal thermal insulation curtain of greenhouse and greenhouse. When hanging the non-woven thermal insulation curtain, it shall be 30 - 40 cm away from the shed membrane. The thermal insulation curtain can be made into a movable one, that is, it can be opened during the day and t covered at night. -
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