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The community of Nenana, outside of Fairbanks, installed a 4.4 kW PV system on the teen recreational center that has produced over eight MW of electricity since it was installed in early 2011. Solar Thermal Energy Solar thermal energy involves using the sun’s energy to heat conveying fluids that are then used for space heating, hot water heating, or any uses of a similar type. The technology is not unlike that used by wood fired boilers or waste heat recovery systems. The only difference between solar thermal systems and fuel fired boilers is that rather than piping the fluid within the immediate area of a fuel heated source like a burner or diesel generator, the fluid is heated by the sun in large panels before being piped to its point of use and distributed through a heat exchanger. Several types of solar thermal panels can be used; the two most common types are glazed flat plate panels and evacuated tube panels. Though the configurations of the panels differ, they operate on the same principle of absorbing and transporting thermal energy. In addition to PV panels for electricity, Nenana installed two glazed flat solar thermal panels that heat water in the recreational center before entering the hot water heater. Solar thermal energy can be used for heating hot water during the summer, thereby reducing summer energy costs. One consideration for solar thermal systems in Alaska is the result of fluid freezing within the panels and pipes, which can cause the system to rupture. Using conveying fluids with as low a freezing point as possible and shutting down the system during some seasons can help avoid freezing. Real time information on the Nenana PV solar system: https://enlighten.enphaseenergy.com/public/systems/BTcD7969 Solar Thermal panels in Nenana Photo courtesy of Yukon River Inter-Tribal Watershed Council Sustainable Energy Opportunities: Best Practices for Alaska Tribes Page 31PDF Image | Sustainable Energy Opportunities: Best Practices for Alaska Tribes
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