The construction of energy-saving solar greenhouse

       1st, when design construction energy conservation sunlight greenhouse which questions should pay attention to?
         A good energy conservation sunlight greenhouse, must have following characteristic: One is the diaphanous performance is good, the illumination use factor is high; Two, warms quickly, the heat preservation performance is good; Three is easy to operate and to ventilate row of wet, is advantageous for the management; Four is the structure is reliable, the windproof performance is good, the service life is long; Five is easy to construct, also the investment are few.
In order to realize the above request, when construction must pay attention achieves:
       (1)th, the energy conservation sunlight greenhouse elects: When the design construction energy conservation sunlight greenhouse (awning) chooses the place, must pay attention chooses these topography high dry, the heavy rain the ponding, the ground water burying depth will not be lower than 1 meter from now on, the irrigation and drainage condition is good, the soil will be fertile, the soil texture will be loose, the permeability will be good, the soil layer will be deep, protects fertilizer the water retention property to be able to be good, also leeward toward the sun, transportation convenience land sector.
       (2)th, the energy conservation sunlight greenhouse seat approaches: The practice proved that, the sunlight greenhouse should complete the facing south direction, and in the west (cloudy) 3--5 degrees are good.Such direction, accepts the sunlight time to be long, the energy of light use factor is high.If because of reasons and so on terrain topography, could not achieve the above requests, also should adjust with every effort, causes it at 10 degrees in the west to the easterly 5 degree scopes in.The method is as follows: Noon 12 o'clock to 12.20 minutes between, inserts a vertical range pole in the ground, through the observation, selects its shortest projection, then makes its perpendicular line, again take this perpendicular line as, the cloudy 5 degrees delimits the straight line, draws the straight line, namely for greenhouse back wall direction base directrix.
       (3)th, energy conservation sunlight greenhouse size: Energy conservation sunlight greenhouse, its thing length 50-70 meter comparison being suitable, if length short in 40 meters, then the greenhouse volume is small, the heat preservation performance reduces, meets the severely cold weather, in the room easy to have the cold damage or the freeze injury.If the length surpasses 80 meters, then pulls Ge Caoshan the time to be long, manages not conveniently.
       (4)th, energy conservation sunlight greenhouse highly and north and south span: The greenhouse highly and the north and south span, should decide according to the local latitude.Because highly and the span is deciding the greenhouse natural lighting surface angle (Figure 1), natural lighting surface angle about sunlight incidence angle size.Must guarantee the sunlight has the big rate of incidence, its incidence angle should be smaller than 40 degrees.Because the sunlight projection rate and the incidence of light relations is close.Its incidence angle in 0-40 degree scope, along with incidence angle enlargement, light rate of incidence drop, but the change is not obvious, when the incidence angle is bigger than after 40 degrees, along with incidence angle enlargement, its transmittance even suddenly drops obviously.

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