professional sunlight board greenhouse for hydroponic aeroponics system
1. Light-collecting design of solar greenhouse
Sunlight is an indispensable resource for photosynthesis of plants and is also a major thermal resource of solar greenhouse. Therefore, designing of solar greenhouse would start by addressing light-collecting issue and maximally use sunlight to be penetrated to the inside of the greenhouse.
Solar greenhouses are usually in use in winter, spring and autumn in the northern area of China. During winter, the Sun is low in angle. The Sun rises in the southeast and sinks in the southwest. Therefore, to maximally use sunlight in winter, solar greenhouses mostly adopt the south-to-north position with extension to the east and the west.
Heat preservation of solar greenhouse consists of heat preservation closure structure and movable heat preservation quilt. Heat preservation material in the front slope should use flexible material to facilitate packing-up after sun rise and falling-down after sunset.
Research and development concerning thermal insulation material in the new house stresses facilitation of such indexes as mechanical operation, low price, light weight, anti-aging and water-proof and so forth.
The front slope is covered by heat preservation quilt during night and its eastern, western and northern side are single-slope plastic greenhouses of containment wall that are addressed as solar greenhouses. Its original form is single slope glass greenhouse with translucent coverage materials at the front slope using plastic membrane to replace glass that thus evolved into the early form of solar greenhouses. Solar greenhouses feature such characteristics as sound heat preservation, low investment and conservation of energy. It is quite a fit in economically retarded rural areas in China.
Second, the light of the greenhouse design
Practice has proved that the winter morning the outside temperature is very low.Electro greenhouse in the morning after the open curtain, the indoor temperature is often significantly decreased. Sunlight greenhouse position as far as possible to the west as well, this will help extend the afternoon light time and night insulation. Are 5 degrees west is appropriate, not more than 10 degrees.
When the incident angle of light from 0 degrees to 40 degrees when the light transmission of transparent material has little effect on the amount of light reflection loss rate of only a few percentage points; when the incident angle in 40 degrees a 60 degrees change, the light And the incident angle increases with the angle of incidence. When the incident angle is more than 60 degrees, the light transmittance decreases sharply. Therefore, the angle of incidence of 40 degrees or 50 degrees of projection angle is the impact of transparent material light transmission rate of the critical point. In the early days of the development of solar greenhouse, put the winter solstice sun on the greenhouse lighting surface of the maximum projection angle of 50 degrees of lighting angle as a reasonable lighting roof angle.
Third, insulation
Sunlight greenhouse insulation by the insulation structure and the activities of insulation is composed of two parts. The front slope of the insulation material should be flexible materials to easy to sunrise after the put away at sunset.
The development and development of new front roof insulation materials mainly focus on the requirements of mechanized operation, cheap price, light weight, anti-aging and waterproofing.
The solar greenhouse is mainly composed of three parts: the wall, the rear roof and the front roof. It is the "three elements" of the solar greenhouse. The front roof is the whole surface of the greenhouse. During the daytime, the roof is covered with plastic film. When the light is weakened, the plastic film is covered with the activity insulation to strengthen the greenhouse insulation.
As the development of the plastics industry, coupled with the glass easily damaged, most of the rural solar greenhouse plastic film for the roof material. Especially in the north of China in the greenhouse on the rise of plastic greenhouse greenhouse, with obvious efficiency, energy saving, low cost characteristics, welcomed by farmers and consumers, is the development of high yield, high quality and efficient agricultural one of the effective measures, Will get faster development. Practice has proved that where the minimum outdoor temperature of not less than -25 ℃, the use of plastic solar greenhouse special structural properties, can keep the room above 5 ℃ temperature, can get satisfactory results.
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