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heat is stored in a tank, such as the conventional water heater tank, to provide hot water for domestic use. Pumped, direct hot-water systems circulate tap water through the collector. In hard-freezing climates, a water/glycol mixture is pumped through the collector, and a heat exchanger is used to transfer energy to the domestic hot water. Larger active systems can also be used to provide hot water for space or industrial process heat. Figure 2-8. Solar water-heating systems Thermosiphon solar water heaters combine the features of active and passive solar water-heating systems. The collector is similar to an active collector, but it is connected to a storage tank located slightly above the collector. Water circulates by thermal convection, without requiring a pump, and the tank is connected in series between the building cold-water supply and the conventional solar water heater. Hot water is driven from the storage tank by domestic line- pressure whenever there is a demand for it. Two types of collectors can generate higher temperatures. The higher temperature can be used to drive absorption or desiccant air-conditioning systems, as well as for process heat, hot water, and space heat. Evacuated-tube collectors achieve higher temperatures because vacuum glass jackets surround the finned tubes, so heat loss is reduced. Some are installed with non-tracking compound parabolic reflectors. Parabolic troughs are also used for thermal applications. Industry has developed roof-mounted, trough-like systems with the intent of operating as combined heat and power (CHP) systems. In general, sales of solar water-heating and space-heating systems in the United States have declined steadily since the end of solar tax credits in the early 1990s. However, some manufacturers have privately indicated that sales have recently increased as some builders and developers are including solar water-heating systems as standard features on new homes. Solar water heating is also very popular in Hawaii, where energy costs are especially high. Solar Energy Technologies Program Multi-Year Technical Plan 28PDF Image | Solar Energy Technologies Program
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