vb.net barcode generator Figure 3-8 Heliodon sundial experiment. in Software

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Figure 3-8 Heliodon sundial experiment.
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Read more about heliodons on the web www.pge.com/003_save_energy/ 003c_edu_train/pec/toolbox/arch/heliodon/ heliodon.shtml arch.ced.berkeley.edu/resources/bldgsci/ bsl/heliodon.html en.wikipedia.org/wiki/Heliodon Figure 3-9 Using a cardboard model building to model solar shading.
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Construct a model from cardboard (Figure 3-9), and include for example, window openings, doors, patio doors, and skylights. By turning the table through a revolution, it is possible to see where the sun is penetrating the building, and what parts of the room it is shining on. This is useful, as it allows us to position elements of thermal mass in the positions where they will receive the most solar radiation. We can also make models of say, a solar array, and cluster of trees, and see how the trees might overshadow the solar array at certain times during
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the year. Use the heliodon with scale models to devise your own solar experiments! Now with modern computer aided design (CAD) technology, the heliodon can be replicated digitally inside a computer. Architects routinely use pieces of CAD software to look at how light will penetrate their buildings, or whether obstructions will overshadow their solar collectors. However, heliodons are still a very quick, simple technology which can be used to make a quick appraisal of solar factors on a model building. A professional, more durable heliodon can be seen in Figure 3-10.
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Small torch Length of string Tape Big sheet of paper Bunch of pencils Elastic band
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one end roughly to the center of the paper with the tape. Now hold the string to one side of the piece of paper, and attach the torch to the string so that the bulb of the torch falls within the boundary of the paper. We are going to see how angle affects the light power falling on a surface when the distance from the surface remains the same. Now imagine our torch as the sun, hold the torch to face the paper directly keeping the string taught. You should see a spot of light on the paper.
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Attach the large sheet of paper to the wall using the tape. Then, take the piece of string, and attach
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However, the area on which the light fell did change. When the torch was held perpendicular to the paper, there was a circle in the middle of the page. However, hold the torch at an angle to the page and the circle turns into an oval with the result that the area increases. What does this mean to us as budding solar energy scientists Well, the sun gives out a fixed amount of light; however, as it moves through the sky, the plane of our solar collectors changes in relation to the position of the sun. When the sun is directly overhead of a flat plate, the plate receives maximum energy; however, as we tilt the plate away from facing the sun directly, the solar energy reaching the plate decreases. You might have noticed that as you angled the torch and the beam spread out more, the beam also became dimmer. Remember the bunch of pencils Well grab them and put an elastic band around them. Imagine each pencil is a ray of light from the sun. Point them down and make a mark with the leads on a piece of paper. Now, carefully tilt all the pencils in relation to the paper and make another mark with all the pencils at the same time (Figure 3-12). As you can see, the marks are more spread out. Remembering that we are equating our pencil marks with solar rays, we can see that when a given beam of light hits a flat surface, if the beam hits at an oblique angle, the rays are more spread out. This means that the power of the beam is being spread out over a larger area. It is important that we understand how to make the most of the solar resource in order to make our solar devices as efficient as possible.
Figure 3-10 A professional architect using a heliodon to make estimations of solar gain on a model building.
Draw a ring around the area of highest light intensity. Now, hold the torch at an angle to the paper, and again with the string taught, draw a ring around the area of high intensity. Repeat this at both sides of center a few times at different angles. Figure 3-11 shows us what your sheet of paper might look like. What can we learn from this Well, the power of our torch remained the same, the bulb and batteries were the same throughout the experiment, the amount of light coming out of the torch did not change.
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