unipu2009
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Joined: Aug. 2021 |
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Posted: Aug. 15 2021, 22:15 |
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Indirect circulation systems, on the other hand, send heat transfer fluids through their collectors. Heat exchangers then transfer heat from the fluids to the potable water. These systems are best used in climates that have long periods of freezing temperatures. Some indirect systems also come with overheat protection. When the solar intensity is too high, this feature prevents the transfer fluid and collector from being damaged.
There are two types of indirect systems: antifreeze and drainback. The antifreeze system uses a glycol-water mixture to transfer heat and protect it from freezing. Drainback systems use pumps to drain the transfer water from the system’s pipes. This ensures that there is no liquid in the pipes for freezing.
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