Although the solar greenhouse has a very good thermal insulation performance, but from the point of view of safety, heating equipment is still an important factor. The southern part of our country generally does not need to heat up, but if we encounter bad weather continuously, we still need to use the energy stored in the greenhouse itself, otherwise it will not be able to meet the growth of vegetables. Therefore, whether in the south or north, heating equipment has always been a necessary protective measure. The technical aspect requires that in the equipment configuration of solar greenhouse, the configuration of thermal insulation equipment should be demonstrated in great detail. Of course, the work of Qinghai photovoltaic greenhouse needs the cooperation of a variety of equipment, with higher and higher temperature requirements, especially in autumn and winter production, external sunshade system, internal thermal insulation system and window opener and fan, wet curtain and other equipment need to be applied. For more information about Qinghai photovoltaic greenhouse project, please contact Minghao greenhouse Engineering Construction Company directly.
4. generally speaking, indoor louvers can only block 17% of the solar radiation heat, while the horizontal sunshade with an outdoor south elevation of 45 degrees can easily cover 68% of the solar radiation heat, and the shading effect between the two is very different. Installed in the window inside the curtain, soft 100 pages and other sunshade facilities, most of the solar radiation heat absorbed will be distributed to the indoor air. If installed on the outside of the sunshade, most of the radiant heat absorbed will be distributed to the outdoor air, thus reducing the effect of indoor temperature. Therefore, the use of external sunshade (sunshade) is the best way to save energy in buildings.
Avoid direct sunlight and high temperature in the car. Dashboards, which control these areas, are mostly made of engineering plastics. plastics will age and fade after being exposed to the sun for a long time. Although we will do strict aging tests during development, it is good to pay more attention to them. So it is necessary to always have a sunshade mat.
Figure 3 is a schematic diagram of the patent application trend of the third-tier technology branch in the field of internal and external decoration. The growth trend of patent applications related to seat technology and headlamp technology is more obvious. The seat is the first component to evaluate whether the car is comfortable or not. Headlights are also an important part of safe driving. From the overall trend, the number of patent applications for the above technologies has increased rapidly since 2005. There is also a growth trend in dashboards and center consoles, rearview mirrors and bumpers, with slower growth in patent applications compared with seat and headlight technology. The number of technical applications such as sunshade panel and interior panel, radiator grille and spoiler is less, and the application trend is relatively flat.
Fifth, tea. Winter tea is in a dormant period, generally low temperature overcast and rain has a limited impact on tea, but if it encounters wind and freezing or extremely low temperature, it will affect tea tree winter and spring tea production in the coming year. According to the weather conditions, take measures to protect against cold and heat preservation according to local conditions. One is to cover and keep warm. Cover the tea cover with rice (miscellaneous) grass, sunshade net and so on before the cold air comes. The second is to build barriers and guard against the wind. The land easily affected by wind freezing, the windproof barrier was established in the windward place by using materials such as sunshade net in advance, which was higher than the 20cm of tea canopy and tilted to the direction of tea tree. The third is to restore the tree situation in time. For the heavily frozen tea garden, due to the appropriate tree system after the beginning of spring, it is better to prune rather than deep pruning, so as to strengthen the management of spring tea fertility.
The optimum temperature for strawberry seedling growth was 25 ℃ ~ 30 ℃, and the stolon stopped growing when it exceeded 32 ℃. Therefore, in the early stage, the greenhouse should do a good job of heat preservation, improve the air temperature and substrate temperature, and promote the early emergence of stolons. In the southern region, the temperature from mid-May to early July is suitable for the occurrence of stolons, during which the number of stolons is large and the interval between stolons is short. From mid-July to August, with high light intensity and high temperature, the greenhouse should be covered with a sunshade net with a shading rate of 60% from 9 am to 5 pm every day, so as to reduce the temperature and ensure the normal growth of mother and offspring. In addition, moderate shading in the later stage of seedling cultivation can meet the low temperature and short day conditions needed for strawberry flower bud differentiation and promote strawberry flower bud differentiation.