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Posted by Steve Cothran on July 20, 2006, 10:55 pm
On Thu, 20 Jul 2006 23:48:16 GMT, .p.jm@see_my_sig_for_address.com
wrote:
> Because I've installed and serviced more heat pump water
>heaters than you've ever read about on the Internet.
So has anyone made one yet that works and is reliable? I bought into a
York HPWH around 1988. It didn't live very long. Maybe some big
advance since then?
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Posted by on July 20, 2006, 9:11 pm
wrote:
>On Thu, 20 Jul 2006 23:48:16 GMT, .p.jm@see_my_sig_for_address.com
>wrote:
>
>
>> Because I've installed and serviced more heat pump water
>>heaters than you've ever read about on the Internet.
>
>So has anyone made one yet that works and is reliable? I bought into a
>York HPWH around 1988. It didn't live very long. Maybe some big
>advance since then?
>
I haven't followed it, but the thing is, you have to
understand the concept - it's very basic.
Instead of the high-side ( hot compressor discharge gas )
going to a coil with air blowing over it, it goes to a heat exchanger
with water on the other side. That's all there is to it. I recall
Amana used to do it, I forget who else.
It will be efficient in the same way a heat pump is - moving
heat instead of converting some other form of energy into heat.
But the plumbing had better not be set up like Nick said,
cause it just don't work.
And it had better have some kind of relief to control head
pressure, for instance a secondary air coil with appropriate valving
and thermostatic control.
And it better be on a SERIOUS compressor, not the little
throw-away rotary things they put in throw-away window-shakers.
'Serious' meaning 'real', like Copeland, Tecumseh, Bristol, etc.
--
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Paul ( pjm @ pobox . com ) - remove spaces to email me
'Some days, it's just not worth chewing through the restraints.'
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Posted by on July 21, 2006, 5:00 am
> But the plumbing had better not be set up like Nick said,
>cause it just don't work.
How would that plumbing arrangement fail to work?
Nick
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Posted by Jeff Wisnia on July 21, 2006, 11:26 am
nicksanspam@ece.villanova.edu wrote:
>
>
>> But the plumbing had better not be set up like Nick said,
>>cause it just don't work.
>
>
> How would that plumbing arrangement fail to work?
>
> Nick
>
It would sure fail if that "aquarium" he talked about placing the
condenser in didn't have a completely sealed top, city water pressure
would make it overflow in a jiffy.
And when he said, "when/if the tank water heater completely fills", I
assume he meant to say, "when/if all the water in the tank comes up to
110F temperature".
He didn't mention how he was going to handle switching the water
heater's original heating source back ON when he didn't need A/C. Or if
it's just a storage tank, what he was going to do with the cold air from
the A/C when he didn't need to cool the room.
Removing the condenser fan blade would provide a minuscule reduction in
motor power consumption, but if left there blowing air against the side
of that "aquarium" it'll just make some of the heat he's trying to put
into the water "fly away". Some thermal insulation around the "aquarium"
would seem to make sense though. OTOH if the design of the A/C had that
fan also blowing some air over the compressor to keep its operating
temperature down, then removing it might not be too smart.
It's an interesting academic discussion, better suited for a physics
classroom, but why reinvent the wheel? There seem to be plenty of
"tailor made" units which could accomplish what he wants to do, and
their materials and operating parameters were probably optimized by
their designers to be far better than what he'd achieve by "converting"
a cheap window A/C. In that regard I do agree with Mr. Milligan's
conclusion. It'd be a bummer to spend a lot of time and effort doing
what the OP suggested only to find that it suffered from infant
mortality during it's first few weeks of "field testing".
--
Jeffry Wisnia
(W1BSV + Brass Rat '57 EE)
"Rudeness is the weak man's imitation of strength."
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Posted by on July 21, 2006, 2:50 pm
>> How would that plumbing arrangement fail to work?
>
>It would sure fail if that "aquarium" he talked about placing the
>condenser in didn't have a completely sealed top, city water pressure
>would make it overflow in a jiffy.
No. The aquarium would be unpressurized. Its water would flow through one
side of the plate heat exchanger, with pressurized water on the other side.
>And when he said, "when/if the tank water heater completely fills", I
>assume he meant to say, "when/if all the water in the tank comes up to
>110F temperature".
Yes.
>He didn't mention how he was going to handle switching the water
>heater's original heating source back ON when he didn't need A/C.
We might just disconnect the bottom element.
>Removing the condenser fan blade would provide a minuscule reduction in
>motor power consumption...
I disagree. Rhetorically-speaking, an assertion demands no more than a
counterassertion. Then again, perhaps you have numbers?
Nick
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