太陽能光熱資料匯總(英文版)(存儲版)
【正文】 household water through the collectors and into the home. They work well in climates where it rarely freezes. Active indirect water heater Also known as an active closedloop system, a solar heater that circulates a fluid other than water (such as diluted antifreeze) through a collector. The collected heat is transferred to the household water supply using a heat exchanger. Indirect solar water heaters are popular in climates prone to freezing temperatures. Passive solar water heating systems: ? Integral collectorstorage passive system ? Thermosyphon system A thermosyphon system A thermosyphon system, also known as a passive system, does not require a pump to circulate the water but instead relies on density differentials where the warmer water rises to the highest point. For this system to function the tank must be mounted above the collector, relative to the horizontal. Comparison between Active and Passive heating systems Advantage of Active over Passive (Thermosyphon） Advantage of Passive (Thermosyphon) over Active Greater control over system Simple System setup Superior efficiency More Cost Effective Flexibility in positioning of storage tank Operates without power Easier to overe freezing Can be used with both low pressure and high pressure systems The Main Factors that govern the choice of types of system to be installed include the climatic condition, hot water demand, size of the system and space availability for placing extra ponents, etc. For example, low maintenance direct system can be used in smaller facilities with low hot water demand whereas active indirect system is usually installed in larger facilities with higher hot water demand. Maintenance and Expected Life The maintenance requirements for solar water heating system vary depending on the system configuration. In general, solar thermal collectors have no moving parts and the maintenance r
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