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What does a solar heating system look like
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Figure 4-1 illustrates a basic solar water heating system. We can see a large storage tank in the Figure. This is filled with water and is used as a thermal store. It is imperative that this tank is incredibly well insulated as it is pointless going to a lot of effort to collect this solar energy if we then lose it in storage! You will notice that the solar hot water tank has a gradient fill this denotes the stratification of the water the colder water sinks to the bottom, while the warmer water is at the top of the tank. We draw the hot water off from the top of the tank, while replacing the hot water with cold water at the bottom of the tank. This allows us to maintain the layered stratified nature of the tank. At the bottom of the tank, we can see a coil; this is shown more clearly in Figure 4-2 this coil is in fact a copper pipe we can see that the pipe enters the tank at the bottom, and exits the tank at the top. The pipes are connected in a closed circuit to a solar collector. This closed circuit is filled with a fluid which transfers the heat from the solar cell to the tank. This is the simplest type of solar system it is called a thermosiphon. The reason for this name is that the process of circulation from the solar cell to the tank is driven by nothing more than heat. Natural convective currents set up a flow, whereby the hot water makes its way around the circuit. It is also possible to insert a pump into this circuit to increase the flow of the heat transfer medium.
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Our demand for hot water is fairly constant throughout the year. We use more or less the same amount of hot water for washing and cleaning in the winter as we do in the summer.
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We can also use solar energy to heat our space directly passively, rather than using an active system. This is called passive solar design. We can design our buildings with large expanses of glass on the sun-facing fa ades in order to capture the solar energy and keep the building warm and light. However, the requirements for space heating are different in the winter from in the summer. If we design our buildings for summer conditions, they could be intolerably cold in the winter. For this reason, we can use architectural devices such as
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Figure 4-1 A basic solar water heating system.
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We can also drive this pump using photovoltaic solar cells. This means that our heating is not using electricity from the grid and hence not using energy generated from fossil fuel sources. There is one manufacturer, Solartwin, which supplies a system which consists of a solar thermal panel, and a pump driven by photovoltaics. The advantage of this approach is that the energy for the pump is provided at the same time as there is heat in the system.
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A good science fair project might be to build a demonstration solar water heating system using easy-to-use flexible aquarium tube for the plumbing and a soda bottle for the hot water storage tank. A few thermocouples or thermistors will allow you to monitor the temperatures around the setup and see how effectively it is working. Figure 4-2 A cutaway of a thermal store tank.
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Figure 4-3 Flat plate versus evacuated tube collectors.
Solar collectors
There are two types of solar collector: flat plate, and evacuated tube. We can see in Figure 4-3 the two types of collectors compared. While a greater amount of sun falls on the flat plate, the evacuated tube collectors are better insulated. However, as the sun moves in an arc through the sky, the flat plate collector s effective area becomes smaller, and as the evacuated tube collectors are cylindrical, the area presented toward the sun is the same. In Figure 4-4 we see the make up of a flat plate collector. It is essentially quite a simple device. There is insulation, which stops the heat that it absorbs from being transmitted into the roof it is mounted on. A coil of tube within this collects the heat and transmits it to the storage tank, and at the front of the collector is an absorbent surface.
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