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A comment on OpenERV. Parent comment

Re:OpenERV by LukeShu on Monday December 16, 2024 @01:14AM (#42428412)
Counter-flow heat exchangers can be very efficient, without a heater or cooler attached. That said, I don't think I've seen a commercial ERV claim to be more than 80% efficient, so I'm skeptical of the 90% measurement.

(I've seen ERVs with heaters attached; but for the purpose of avoiding frost buildup when it's below freezing outside.)

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Re:OpenERV by cheeseface on Monday December 16, 2024 @03:29AM (#42429066)
In my experience 80% plus is quite common in the models sold for colder environments. E.g. Mitsubishi electric Lossnay advertises 86%.
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Re:OpenERV by cyberax on Monday December 16, 2024 @01:37AM (#42428529)
Commercial HRVs often use rotating disks, not counterflow heat exchangers. Disks are freeze-proof, but they need to be powered.
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