SOLAR COLLECTOR OPTIONS
- Flat Plate Collector
- Evacuated Tube Collector
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Liquid-Based Active Solar Heating; Solar liquid collectors are most appropriate for central heating. They are the same as those used in solar domestic water heating systems. Flat-plate collectors are the most common, but evacuated tube and concentrating collectors are also available.
In the collectors, a heat transfer or "working" fluid such as water, antifreeze (usually non-toxic propylene glycol), or other type of liquid absorbs the solar heat. At the appropriate time, a controller operates a circulating pump to move the fluid through the collector.
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