RE: Air Con vs. Heat Exchangers

["Mick Furlong" <dorsai@xxxxxxx>]

Salmonella or legionnaires?

> -----Original Message-----
> From: Kenneth Watt [mailto:kennethwatt@xxxxxxx]
> Sent: 18 May 2001 18:42
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] Air Con vs. Heat Exchangers
>
>
> Mark,
>
> There are systems that allow this sort of use of air-con/heating
through
> "blown-air" systems and they are readily available from a
number
> of places.
> Most are designed for commercial appliacations though and, as such,
cost
> packets! This is due to the technicalities of the electronics and
cooling
> power, put it this way, a compressor for a domestic fridge freezer US
size
> is ?200-250 that cools, approx, 8cu ft to -18C and 15cu ft to 3C
> now imagine
> on the same scale the cost to cool a home! It doesn't quite work out
that
> way but you'll see what I'm driving at, it all comes down to scale and
> efficiency of the actual components. BTW, that US fridge/freezer
> retails at
> 1.5K!
>
> K.
>
> -----Original Message-----
> From: Mark Harrison [mailto:Mark.Harrison@xxxxxxx]
> Sent: 18 May 2001 15:17
> To: 'ukha_d@xxxxxxx'
> Subject: RE: [ukha_d] Air Con vs. Heat Exchangers
>
>
> OK - here's the complex one!
>
> This allows three separate modes:
>
> 1: Basic heat exchanging only, to warm incoming air, for ventilation
in a
> fuel-efficient manner.
>
> 2: Heat exchanger bypassed, heat pump cools the incoming air, for
summer
> cooling.
>
> 3: Heat exchanger warming incoming air, then heat pump heating it, for
> winter heating.
>
> For clarity, I've included the "airflow" paths with other
paths greyed out
> for all three modes. As Ian says, it may be possible to consolidate
the
> "exchanged" and "bypass" paths for the _outgoing_
airflow in a domestic
> system.
>
> In principle, there's a fourth mode, which is bypassing the heat
> exchanger,
> but not turning on the heat pump. It would basically be ventilation
only,
> with no heating/cooling. Not sure whether you'd ever end up using
> it except
> in situations where the heat pump was thermostatically controlled and
you
> didn't want it to get any colder indoors!
>
> Mark Harrison
> Head of Systems, eKingfisher
>
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5PX
> Registered in England, Number 1664812
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> -----Original Message-----
> From: Mark Harrison [mailto:Mark.Harrison@xxxxxxx]
> Sent: 18 May 2001 11:42
> To: 'ukha_d@xxxxxxx'
> Subject: RE: [ukha_d] Air Con vs. Heat Exchangers
>
>
> 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
>
> ******************************************************************
> **********
> Kingfisher plc
> Registered Office: North West House, 119 Marylebone Road, London NW1
5PX
> Registered in England, Number 1664812
>
> This e-mail is only intended for the person(s) to whom it is addressed
and
> may contain confidential information.  Unless stated to the contrary,
any
> opinions or comments are personal to the writer and do not represent
the
> official view of the company.  If you have received this e-mail in
error,
> please notify us immediately by reply e-mail and then delete this
message
> from your system.  Please do not copy it or use it for any purposes,
or
> disclose its contents to any other person.  Thank you for your
> co-operation.
> ******************************************************************
> **********
>
>
>
> -----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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