College】 【weak point of the calculation of solar array.

<br> <BR> because solar energy is a clean source of energy, its applications are growing rapidly worldwide. .Use of solar power generation is a way of using solar energy, but the current construction of a solar power system cost is still high, from our point of view at this stage the cost of solar power, and its cost in the cost of solar components is about 60 .70%, therefore, in order to more fully effective use of solar energy, how to select the solar azimuth and tilt angle of the square is a very important issue. .<BR> <BR> 1. <BR> <BR> Solar azimuth angle is a square matrix of the azimuth angle between vertical and south (east side is set to a negative angle, set the west side .as a positive angle). .In general, square towards the south (that is square and south of the vertical angle 0 °), the solar power generation is the largest. .To deviate from the south (northern hemisphere) 30 ° degrees, the square of the generating capacity will be reduced by about 10% to 15%; to deviate from the south (northern hemisphere) 60 °, the square of the generating capacity will be reduced by about 20% to 30% .. .However, in the sunny summer, the solar radiation energy is the greatest moment in the early afternoon, so the orientation of square slightly west side some time in the afternoon always receive the maximum power output. .In different seasons, solar orientation of square slightly east or west have access to power some of the largest time. .Square place settings by many conditions, for example, when the land on the ground to set the azimuth, set on the roof when the roof of the azimuth, or time to escape the shadow of the sun's azimuth, as well as layout planning, power generation efficiency, .design and planning, building purposes and many other factors have a relationship. .If you want to adjust the azimuth of the peak load in the day time and peak time of the same generation, please refer to the following formula. .The grid of the occasion, hope the above aspects into account the situation to select azimuth. .Azimuth = (peak load time of the day (24 hour) -12) × 15 + (longitude -116) Oct. 9 in Beijing when the solar azimuth at different squares, irradiation and curve over time. .In different seasons, solar radiation for various orientations of the peak in time is not the same. .<BR> <BR> 2. <BR> <BR> Tilt angle is a square plane and the level of solar angle between the ground and hope that this angle is the square of the year when the largest generation the best .tilt angle. .The best angle of inclination of the year and the local geographical latitude, when the higher latitudes, the corresponding tilt angle is also large. .However, and azimuth, as in the design should take into account the tilt angle of the roof and the snow fall of the tilt angle (slope greater than 50% -60%), and other aspects of the constraints. .The snow fall of the tilt angle, even in the snow and less of the total power generating capacity also increased, hence, especially in the grid system, does not necessarily give priority to the snow fall, in addition to ., we should further consider other factors. .For the south (azimuth of 0 ° degrees), tilt angle from horizontal (tilt angle is 0 ° C) began the transition to the best angle, its increasing solar radiation until the maximum, and then increase the angle of its .decreasing solar radiation. .Especially in the tilt angle is greater than 50 ° ~ 60 ° after the sharp decline in solar radiation, until the end of the vertical position while the power output dropped to a minimum. .Square from the vertical position to 10 ° ~ 20 ° of tilt placed with real examples. .For the azimuth angle of 0 ° degrees is not the case, slope values of solar radiation is generally low, the maximum value of solar radiation level in and near the close of the tilt angle. .Above for the azimuth, tilt angle and the relationship between power output, a square of a specific design for the azimuth and tilt angle should be integrated to further considered together with the actual situation. .<BR> <BR> 3. The shadow of the impact of power generation under normal circumstances, when our generating capacity in the calculation is not in the square surface obtained under the shadow of the premise. .Therefore, if solar cells can not be direct sun shine, then only scattered light is used to generate electricity, this time without the shadow of power generation than to reduce about 10% to 20%. .In view of this situation, we want to correct the theoretical calculation. .Typically, the square surrounded by objects such as buildings and mountains, the sun came out, the surrounding buildings and there will be the shadow of the mountain, so the choice should be laid square as possible to avoid the shadow of the place. .If you really can not escape, nor should the method for solar cells to solve the wiring, so that the shadow of power generation to minimize the impact. .In addition, if the square is around the place, the back of the square and close the distance between the front of the square, the square in front of the square behind the shadow of generating capacity will have an impact. .There is a high bamboo pole for the L1, the length of the shadow of north-south direction L2, solar altitude (elevation) for the A, B in the azimuth, assume the shadow rate is R, then: <BR> <BR> R = L2 ./ L1 = ctgA × cosB <BR> <BR> winter solstice, the day of this type should be calculated, <BR> <BR> because the longest shadow of the day. .For example, on the edge of the square of the height h1, the height of the lower edge of h2, then: square distance between a = (h1-h2) × R. .When the latitude is high, increasing the distance between the square, with a corresponding set places the area will increase. .For square measures against snow, its tilt angle, thus making the height of matrix increases, in order to avoid shadow effects, and accordingly the distance between the square will also increase. .Usually arranged in square array, were selected to be constructed for each square size, its height adjustment to the appropriate value to use its highly errand to adjust the distance between the square to a minimum. .Square design of the specific solar cell, determine the azimuth and at a reasonable angle, it should also be considered comprehensive in order to achieve the best square. .<BR>.