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Chilled water for residential forced air AC systems?

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Chilled water for residential forced air AC systems? blueman 08-15-2006
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Posted by blueman on August 15, 2006, 6:05 pm
Our 100+ yr old house currently has 3 separate forced hot air
gas-fired heating units.

We would like to add central air sharing the same ductwork and
blowers.

The "traditional" approach would be to add a separate
compressor/evaporator for each of the 3 heating units.

I have seen that some high end remodels are using a single chilled
water unit to supply coolant to multiply blower units and that this is
somehow "better".

Can anyone comment on the pros/cons and appropriateness of using such
a system residentially?

I am particularly interested in comparing initial cost (equipment &
installation), efficiency, noise-level, and reliability.

I will be hiring a reputable HVAC contractor for the installation.

Thanks.

Posted by =?iso-8859-15?Q?Tekkie=AE?= on August 15, 2006, 8:09 pm
blueman posted for all of us...
I don't top post - see either inline or at bottom.

> Our 100+ yr old house currently has 3 separate forced hot air
> gas-fired heating units.
>
> We would like to add central air sharing the same ductwork and
> blowers.
>
> The "traditional" approach would be to add a separate
> compressor/evaporator for each of the 3 heating units.
>
> I have seen that some high end remodels are using a single chilled
> water unit to supply coolant to multiply blower units and that this is
> somehow "better".
>
> Can anyone comment on the pros/cons and appropriateness of using such
> a system residentially?
>
> I am particularly interested in comparing initial cost (equipment &
> installation), efficiency, noise-level, and reliability.
>
> I will be hiring a reputable HVAC contractor for the installation.
>
> Thanks.
>
Hey Jeffy, you know you don't belong in alt.hvac so get your meds and get on
over to the other cross posted group so you can ask your oft answered questions
there.
--
Tekkie

Posted by Pat on August 15, 2006, 10:26 pm
One house and 3 furnaces = high energy bills. Water AC system will not
be cheap.

I'm not sure if this would will work, but you should look into a
ground-linked heat pump system. I think some are water systems plus
you might be able to use it to heat your house.

blueman wrote:
> Our 100+ yr old house currently has 3 separate forced hot air
> gas-fired heating units.
>
> We would like to add central air sharing the same ductwork and
> blowers.
>
> The "traditional" approach would be to add a separate
> compressor/evaporator for each of the 3 heating units.
>
> I have seen that some high end remodels are using a single chilled
> water unit to supply coolant to multiply blower units and that this is
> somehow "better".
>
> Can anyone comment on the pros/cons and appropriateness of using such
> a system residentially?
>
> I am particularly interested in comparing initial cost (equipment &
> installation), efficiency, noise-level, and reliability.
>
> I will be hiring a reputable HVAC contractor for the installation.
>
> Thanks.


Posted by Richard J Kinch on August 16, 2006, 12:52 am
blueman writes:

> I have seen that some high end remodels are using a single chilled
> water unit to supply coolant to multiply blower units and that this is
> somehow "better".

Where have you seen that?

Are you sure the water is not cooling separate compressors/evaporators at
each air handler? Rather difficult to cool efficiently without a phase
change.

Posted by Pat on August 16, 2006, 1:26 am
Not sure, but I think the OP is looking for a system like a "motel
system" that circulates chilled water to all of the systems and a fan
blows when a unit calls for cooling. He is looking for a system with a
heat exchanger rather than a air-based system like a regular AC.

Richard J Kinch wrote:
> blueman writes:
>
> > I have seen that some high end remodels are using a single chilled
> > water unit to supply coolant to multiply blower units and that this is
> > somehow "better".
>
> Where have you seen that?
>
> Are you sure the water is not cooling separate compressors/evaporators at
> each air handler? Rather difficult to cool efficiently without a phase
> change.


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