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A comment on OpenERV. Parent comment

Re:OpenERV by ilyagr on Monday December 16, 2024 @01:38AM (#42428537)
Yeah, I think this makes sense. If you connect many of my heat exchangers in series, the temperature gradient increases; only the middle one will work at the average of the inside and outside temperature (the example of 3 in a row makes sense to me). At the limit, it becomes what you described.

Thanks!

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Re:OpenERV by vanderZwan on Monday December 16, 2024 @06:19AM (#42430049)
The mechanism described is called a countercurrent exchange. One fun detail is that it's quite commonly found in biological systems in nature too!

https://en.wikipedia.org/wiki/Countercurrent_exchange

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Re:OpenERV by open_erv2 on Monday December 16, 2024 @08:19AM (#42430699)
It's actually a regenerative heat exchanger: https://en.wikipedia.org/wiki/Regenerative_heat_exchanger.
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Re:OpenERV by lsaferite on Monday December 16, 2024 @08:55AM (#42430960)
The person you are replying to was discussing "exchanging heat across a continuous length along opposing flows", which is countercurrent exchange. Regenerative exchange is, at least to my understanding, more of a cyclical store and release process.
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Re:OpenERV by vanderZwan on Monday December 16, 2024 @03:18PM (#42434957)
Yes, which is what OpenERV is. I can understand why they might have thought I was talking about their system, my wording was a bit ambiguous there. So it doesn't hurt that they cleared that up :)
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