Build Your Own Solar Water Heater
What they are interested in, is the cost, that is, the ratio of investment to useful energy. This is not related to 'efficiency'. There are many technologies that are highly efficient, but many households do not adopt them because they are prohibitively expensive. At the other end of the scale, if a manufacturer develops a technology (say solar water heater) with an efficiency of only 5 per cent, but is still cheap for the energy it supplies, it can be an excellent solution, as the 'fuel' is free, and the households do not care if there is fuel wastage. Hence, the equipment manufacturer indirectly plays an important role in the fuel choice.
One of the reasons why it is important to remove suspended solids in water is that the particles can act as a source of food and housing for bacteria. Not only does this make microbiological control much harder but, high bacteria levels increase the fouling of distribution lines and especially heat transfer equipment that receive processed waters (for example, in one's household hot water heater). The removal of suspended contaminants enables chemical treatments to be at their primary jobs of scale and corrosion prevention and microbial control.
Similar to the air collectors, water collectors are used to heat up the water for various domestic and industrial applications. The domestic water heater generally uses flat plate collectors in parallel connection and runs automatically with the thermosiphon action whereas the industrial water heater uses a number of flat plate collectors in series and the thermo-siphon action does not work in this case and hence it uses a photovoltaic-driven water pump to maintain flow of water inside the water collector. A schematic diagram of a PV T water collector is shown in Fig. 3.3. A DC water pump is used to circulate water as the two flat plate collectors are connected in series. Fig. 3.3 Schematic diagram of a hybrid photovoltaic solar water heater as an example of PV T application. Fig. 3.3 Schematic diagram of a hybrid photovoltaic solar water heater as an example of PV T application.
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