Andrew
We did some work with commercial pond foggers. Drop size was a bit big,
2.5 microns. The energy efficiency was very poor and would be worse if
we reduced the drop size. With salt water a scale formed after 24 hours
of running. I think this may have been something to do with residues
left after cavitation.
Do you have any numbers for drop size and energy for glycol?
Stephen
--
Emeritus Professor of Engineering Design School of Engineering
University of Edinburgh Mayfield Road Edinburgh EH9 3JL Scotland
[email protected] Tel +44 (0)131 650 5704 Cell 07795 203 195
WWW.see.ed.ac.uk/~shs
On 17/01/2013 19:34, Andrew Lockley wrote:
I've looked up commercial foggers and they seem to use glycol. This is
a diol, and thus is strongly hydrophillic. It's likely to outperform
paraffin, accordingly.
I'm not sure about long term toxicity of glycol in the environment,
though. Less troublesome alternatives include longer chain alcohols,
or fatty acids. Both of those are also more hydrophillic than the
alkanes in paraffin.
If hydrophobic compounds aren't a problem, then plant oils would
likely be more environmentally benign. Biodiesel isn't too far off oil
in terms of pump prices, so switching to SRM biofuel foggers should be
economically tolerable.
I suggested to Lynn Russell that she might start by testing the
performance of theatre foggers (glycol) , rather than the paraffin fog
she tested in this experiment. There are high -capacity outdoor
foggers for filming, which should be suitable for testing.
On a personal note: This is exactly the kind of thing I thing
geoengineers should be focussed on now. Real-world experiments, not
abstract discussion of governance.
A
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