Greenhouse construction is a lighting building, so it needs to have good light transmittance during construction. Light transmittance is a basic indicator for evaluating the light transmittance performance of a greenhouse. Light transmittance refers to the percentage of the amount of light penetrating into the greenhouse to the amount of outdoor light. The light transmittance of the greenhouse is affected by the light transmittance of the greenhouse light transmitting covering material and the shadow rate of the greenhouse frame. And with the different solar radiation angles in different seasons, the light transmittance of the greenhouse also changes at any time. The level of light transmittance in a greenhouse directly affects crop development and the types of crops selected for planting. When building a greenhouse, attention should be paid to the thermal insulation performance. Improving the thermal insulation performance of the greenhouse and reducing energy consumption are simple ways to improve the efficiency of greenhouse manufacturing. The insulation ratio of a greenhouse is a basic index to measure the insulation performance of a greenhouse. The greenhouse insulation ratio refers to the ratio of the greenhouse light-transmitting material coverage area with small thermal resistance to the greenhouse enclosure structure coverage area with large thermal resistance plus the land area. The greater the insulation ratio, the better the insulation performance of the greenhouse. Greenhouse construction must consider its durability.
The durability of the greenhouse is affected by factors such as the aging resistance of the greenhouse materials and the carrying capacity of the main structure of the greenhouse. In addition to its long-lasting strength, the light-transmitting materials made in greenhouses also exhibit that the light transmittance of the materials continues to attenuate over time, and the degree of attenuation of the light transmittance is a decisive factor affecting the service life of the light-transmitting materials. Since the greenhouse operates in a high temperature and high humidity environment for a long time, the surface anti-corrosion of the components has become one of the important factors affecting the service life of the greenhouse.
The scale and requirements of various facilities for greenhouse production:
The scale of construction determines the size of greenhouses and greenhouses, and must be considered from the aspects of practicality, economy, construction materials, planting requirements, and manufacturing management.
1. The solar greenhouse is a slope greenhouse facing north and south. It is generally not heated, but some cold areas need to be heated temporarily.
2. The construction of double-roof multi-span greenhouses uses hot water heating, which has strong heating capacity, complete indoor equipment and facilities, and can effectively control the indoor climate, and some also adopt automated program control. This kind of greenhouse generally has a relatively large area and high production investment. Greenhouses for growing vegetables are mostly 15 to 30 acres in size, flower greenhouses are less than 10 acres, and scientific research greenhouses are smaller, with a large difference in area. Depends on manufacturing and scientific research needs.
3. Plastic greenhouse production is one of the most commonly used methods in the current construction of protected areas. At present, it is generally believed that a single building with a size of 0.5 to 1.5 acres is suitable, and about one acre is better. Greenhouse construction must determine the production scale according to the economic situation, manufacturing technology, management conditions, and construction materials, so as to obtain large economic benefits with a small capital expenditure. Because the greenhouse production forms and equipment requirements are different, the greenhouse construction costs also vary greatly.
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