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Solar Heating
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Figure 4-4 Cutaway of a flat plate collector.
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This could simply be matt black, or it could be a selective coating. On the roof shown in Figure 4-5 we can see a variety of different solar cells, both thermal and photovoltaic nestling together in harmony.
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Project 4: Build Your Own Flat Plate Collector
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Figure 4-5 An array of different solar thermal cells on a roof.
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Project 4: Build Your Own Flat Plate Collector
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We are now going to make a flat plate collector. There are a number of different types of collector, all suitable for relatively simple manufacture in a home workshop (Figures 4-6 to 4-8). The key thing to remember about solar collectors is keeping the heat in and the cold out. This can be accomplished by using glazing on the sun-facing side of the panels and thermal insulation on the side
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Figure 4-6 A commercially made clip fin collector.
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Aluminum clip fins are one of the easiest ways of assembling a solar collector quickly, as they essentially clip onto a matrix of copper pipe. Another way of constructing a solar collector is to use an old radiator painted black inside an insulated box crude but effective! (Figure 4-9). This system contains more water, and as a result has a slower response time. This is because it takes more time to heat up the thermal mass of the radiator.
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Warning
One of the problems that solar collectors suffer from is freezing in the winter. When temperatures drop too low, the water in the pipes of the collectors expands this runs the risk of severely damaging the collectors.
Figure 4-7 A home-made clip fin collector.
that faces away from the sun. We need to try to eliminate thermal bridges as far as we possibly can.
Figure 4-8 Aluminum clip fins.
Project 5: Solar Heat Your Swimming Pool
Figure 4-9 A recycled radiator collector.
Project 5: Solar Heat Your Swimming Pool
While having a pool in your yard is a great way to exercise and enjoy the summer sun, swimming pools are notorious for drinking energy. The problem is that there is simply such a great volume of water to heat! Energy is becoming more expensive as we begin to realize the serious limitations of the previously cheap and abundant fossil fuels. Some people heat their pools in order to be able to enjoy them out of season; however, that comes with a big associated energy cost. Before you even start to consider heating your pool using solar energy, you need to consider energy reduction and efficiency measures. You might want to consider your usage patterns. Will it really make much difference to me if I can t use my pool out of season After all, who really wants to swim when it is cold and wet outside! Also you might want to consider energy minimization strategies. Is your pool outside and uncovered at the moment Heat rises . . . so all that heat that you
are throwing into your pool is being lost as it dissipates into the atmosphere. This isn t smart! Building some kind of enclosure over your pool will make the most of any investment that you put into solar heating your pool. Once you have taken steps to minimize the energy that your pool requires, you can begin to make advances toward heating it using free solar energy. There is nothing really too complicated about a solar pool heating system. As we only need to elevate the temperature of the water slightly, we can use simple unglazed reflectors. The reason Well think of it like this . . . the water you get from the hot tap to wash with is significantly hotter than the sort of temperature you would be expecting to swim in. A domestic solar hot water rig heats a small volume of water to a very high temperature. By contrast, a solar pool heating system, takes a large quantity of water, and heats it by a small amount. Here is the fundamental difference. Because the water is
circulating at a faster rate, unglazed collectors can provide acceptable efficiency. But that s not all! In some hot climates, pools can have a tendency to overheat. Solar collectors can save the day here! By pumping water through the collectors at night it is possible to dump excess heat.
The Supplier s Index (Appendix B) lists a number of companies that sell products for solar heating your pool.
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