太陽能光熱資料匯總(英文版)-免費(fèi)閱讀
【正文】 How Solar Heating System Works??? ? A solar water heating system prises solar collectors, a storage tank and interconnecting pipework. The solar collectors are usually mounted on roof of a building to capture solar radiation. Small tubes run through the solar collectors and carry liquid –either water or heat transfer liquid with low boiling point. The heat pipe absorbs heat from the solar collectors and transfers heat to ining water. Benefits of solar water heating ? Hot water throughout the year: the system works all year round, though you39。ll need to heat the water further with a boiler or immersion heater during the winter months. ? Cut your bills: sunlight is free, so once you39。ve paid for the initial installation your hot water costs will be reduced. ? Cut your carbon footprint: solar hot water is a green, renewable heating system and can reduce your carbon dioxide emissions In general, solar water heating systems falls into 2 types: Active and Passive . Common Types of Solar Water Heating Systems An active system uses an electric pump to circulate water or heat transfer fluid from storage tanks through the collector. Whereas a passive system relies on gravity and the tendency for water to naturally circulate as it is heated, allowing water or heat transfer fluid to move through the system without the use of a circulating pump. Active solar water heating systems: Active solar water heating systems are characterized as either direct (also called “open loop”) or indirect (also called closed loop) depending on whether the ining water is heated directly in the collectors or indirectly heated via a heat exchanger. ? Automatic solar controller ? Temperature sensor on collector ? Temperature sensor on storage tank ? Solar circulation pump ? Cold water inflow ? Hot water runoff ? Temperature sensor for additional heating Elements of a solar heating system for hot water: Direct solar heating system Pumps circulate
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