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Excellent.
But still hasn't answered the Question. Can
additional chilling be added to the ductwork on a heat recovery system
?
Steve.
--
----- Original Message -----
Sent: Friday, May 18, 2001 10:52
AM
Subject: [ukha_d] Air Con vs. Heat
Exchangers
OK - Here's part 1, the diagram of how a basic Heat
Exchanger based system
works. This is the kind of thing sold by Baxi and
the like for a couple of
grand. (See attached JPG).
And the
explanation:
A pump, and ducting, takes air out of "hot" rooms -
bathrooms, kitchens
(maybe, sometimes not because of the risk of fire),
etc, and runs it through
a heat exchanger before venting it to the
outside.
At the same time, a different pump, and some other ducting,
takes "cold" air
from the outside, runs it through the heat exchanger,
and
then pushes it
into the "cool" rooms, like bedrooms, sitting
rooms.
The heat exchanger acts sort of like a big car radiator. It
does
_not_ mix
the two air streams, instead it pipes them through two
different
sets of
pipes, but the pipes get "wrapped around" each other, and are
deliberately
made so that heat passes through them easily. Effectively,
the
"hot" air
cools down, by passing heat into the "cold" air.
The
point
of a system like this is to compy with two different bits of
the
Building
Regulations:
- The bit that says you have to vent air _out_ of
kitchens
and bathrooms.
This is the job normally done by extractor fans and
kitchen
"hoods" over
hobs.)
- The bit that says you have to have gaps to
allow _fresh_ air _into_ other
rooms. This is the job normally done by
trickle vents above windows in newer
houses, and by "leaky
construction",
quite a lot of which used to be around
window frames in older houses. I
really mean this - anyone who's put sealed
double glazing units into an
older house will have seen massive condensation
problems around them.
This
is because the previous windows "leaked" air so
the water-heavy vapour
never built up in the same way.
However, this doesn't give you
enough
to HEAT your house (because the
incoming air can only get as warm as the
air you're pumping back out of your
kitchens and bathrooms, or the air
outside, whichever is higher.)
Likewise, this doesn't give you
enough
to AIR-CONDITION your house (because
the incoming air can only be as
cool
as the air outside, or the air you're
pumping back out of your kitchens
and
bathrooms, whichever is lower.)
Some systems also allow you to
cut
the heat exchanger _out_ of the system,
and for the two air streams to
vent
directly. You'd do this on warm days,
when you don't want the incoming
air
to be pre-warmed by the outgoing...
Part 2, the bit where we learn
how
to add an air-conditioning unit is the
exciting part ;-)
Mark
Harrison
Head of Systems,
eKingfisher
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