Dave,
There are a couple of things WARFA are working on and I can tell you of one.

Helton have donated one of their double coil heat exchangers for temperature performance testing (along the lines of the tests I did on the 20 plate FPHE) and the results will be provided to them and most likely here when I can get them done. Lots of demands on my time at the moment, despite being on 1 weeks holiday.

The other is still in infancy so far and it may not come to anything.

Does anyone have any ideas on new techniques, filtering, conversion, collection, etc?

Tony