In article <nis6ra$inq$
2...@dont-email.me>,
John Doe <alway...@message.header> wrote:
>It would keep bugs (especially flying bugs like mosquitoes) and airborne
>crud from getting into it. The only question IMO is whether it would
>restrict airflow. The last thing I would want to do is make it into a
>bug trap.
Almost by definition, a screen *would* turn into a bug trap / crud
trap, and restrict the airflow, unless cleaned regularly. The only
way a screen can stop things like bugs and bits of flying debris is to
block them from entry - which means that they tend to end up pushed
against or stuck to the screen wires by the force of the airflow.
A mosquito-grade bug probably doesn't have the strength to fly back
away from the screen, against the in-blowing air... so it's likely to
die there. Bits of dust and dirt can't fly away at all.
The force which holds things against the screen exists only because
the object is blocking part of the airflow... and, thus, obstructing
and slowing the airflow.
In order to keep bugs out of the condenser *without* having them build
up on the mesh, you'd need to block the bugs where the airflow is low,
so that they aren't sucked against the mesh and can fly away. For a
given volume of airflow this means that you'd want to maximize the
screen area, so that the air velocity through the mesh is minimized.
You wouldn't do that by putting a piece of mesh against the surface of
the condenser... rather, you'd build a larger enclosure or "funnel"
around the airco inlet, with a large entrance area covered by mesh,
funneling down to a smaller exit area that matches the condenser
input.
Not the simplest or least-obvious thing to do. Not everybody has an
old Klipschorn cabinet sitting around, waiting for a new use :-)
>Vacuuming bugs and cried off of the outer screen would be a lot easier
>than trying to remove it from the inner slats/coils.
You've got a tradeoff here. Several, actually.
The smaller the screen mesh, and the larger the percentage of the
cross-sectional area that are blocked by the screen wires, the more
efficient the crud-trapping is going to be - smaller mesh openings
allow the blocking of smaller particles. However, this also means
more obstruction to the airflow (even when the screen is clean) and
thus reduced condenser efficiency and/or higher electrical power
needed to maintain the same level of airflow over the cooling fins or
coils. The more efficient the particle-stoppage, the more frequently
you'll need to clean the mesh.
Even with a small mesh, you'll still get some amount of stuff passing
through the screen (smaller particles) and some of these may end up on
the fins/coils.
Larger, more open meshes will obstruct the airflow less, and probably
won't require cleaning as often, but won't be as efficient in stopping
bugs and so forth.
Another approach might be seeing if you could make the condenser
easier to clean. Something like LPS "dry film silicone lubricant",
Super-Lube Dri-Film, a mold-release spray, or something like that
might be useful... a thin, dry layer of silicon or Teflon or wax which
would make the condenser surface slippery, would not attract dust, and
would discourage debris and bug parts from sticking to the fins/coils.