RE: Air Con vs. Heat Exchangers

[Mark Harrison <Mark.Harrison@xxxxxxx>]

OK, here's the next phase.

This has a "heat pump" in series with the "bypass" air
routes. This is on
the basis that you switch the unit into "exchanger bypass" mode
when you
want to cool down the incoming air rather than let it be pre-warmed, and
you
don't bother cooling pre-warmed air.

Furthermore, this assumes that you only bypass the exchanger when you want
to cool the air! A bit naive, perhaps, but wait until the next stage...

In principle, you can acheive this with a domestic air-con unit with a
separate fan unit (that would normally hang outside the window) as follows:

- The Incoming air vent "outside" gets connected to the
"suck in air from
the room" input on the A/C
- The Incoming air vent "room side" gets connected to the
"blow cold air"
output on the A/C
- The Outgoing air vent "room side" gets connected to the
"input on the
separate fan unit" on the A/C
- The Outgoing air vent "outside" gets connected to the
"output on the
separate fan unit" on the A/C

In the case of a "single unit with warm air trunk"-type A/C, then
realistically you just "t-piece" the trunk in with the Outgoing
air vent as
near as possible to the pump, and rely on the pump to suck through all the
air. What you may find, therefore, is that you need a twin-speed pump on
the
going in this case, which runs faster when the air-con's on!

The final piece (coming soon), is the bit that I always have to think hard
about. It combines the use of this system, with the ability to "run
the
air-con backwards" and use the "hot air out" on the aircon
to _heat_ the
rooms...

Mark Harrison
Head of Systems, eKingfisher

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-----Original Message-----
From: Mark Harrison [mailto:Mark.Harrison@xxxxxxx]
Sent: 18 May 2001 11:09
To: 'ukha_d@xxxxxxx'
Subject: RE: [ukha_d] Air Con vs. Heat Exchangers


> But the Baxi system sadly doesn't allow this, which is why I haven't
> done anything to date.

Seems mad that it doesn't! I've got various brochures at home from other
companies who provide similar stuff... let me know if you want me to dig
out
some other names...

Alternatively, for the price of a four valves and a couple of meters of
ducting, you could probably rig up something yourself (see attached.) I
would guess that the four valves could be wired in parallel, and run of a
single (X-10?) relay...

Mark Harrison




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Heat Exchanger with cooling-only Heat Pump.jpg