daestrom wrote:
> Trygve Lillefosse wrote:
> > On Sat, 26 Jul 2008 12:56:27 -0400, "daestrom"
> >
> >> Now, I pay about $1.25 / Therm for NG so that works out to about
> >> $250 / month in winter. If a heat pump runs at COP of 3 with this
> >> water, it would take about 1950 kW-hr a month to get the same 200
> >> Therms and that would cost me about $253 / month ($0.13/kWh). So
> >> that leaves nothing to 'pay' for the use of the water. Nor the cost
> >> of my heat pump upgrade.
> >
> > Sounds like you use a lot of electricity to heat your house...
> >
> > You would not use a heatpump with distributed heating. You get it
> > straight into your house, circulate it and return it(trough the
> > return-pipe).
> Well I agree with you there. But Neon John wants to distribute water at
> only 50F (10C). That is too cold to heat hot-water or your home directly.
> So he wants every house to have a heat-pump.
Why would one use such a low temp ?
> I think that route is a non-starter. Much better to raise the distributed
> water temperature to 120-140F (50C to 60C) and use it directly as you state.
> No need for a heat pump and it's capital/ operating / maintenance costs.
That is AIUI how it is done. Wait for flames !
Graham
On Mon, 28 Jul 2008 20:04:56 -0400, "daestrom"
>Trygve Lillefosse wrote:
>> On Sat, 26 Jul 2008 12:56:27 -0400, "daestrom"
>> Also, the price is diferentiated - if the return water
>> is too hot, you have to pay more. This is to encourage circulation in
>> the house rather than pumping it trough. (At least, this is the Danish
>> way of doing it.)
>How strange. Why would anyone *want* to 'pump it through' ? So is each
>house charged based on flow and inlet/outlet differential (i.e. actual heat
>used)??
If you just pump it trough, your temperature will stay higher.
When you keep the water for some time in the house, the usable
temperature will be a litle lower. You also need a litle more
equipment in the house. (instead of a dumb walve and possibly a pump,
you need some monitoring and circulation.)
Yes. You pay by differential. Although I think you can get some "free
heat" if you let the water get even colder than required.
>daestrom
--
SEE YA !!!
Trygve Lillefosse
AKA - Malawi, The Fisher King
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> > On Sat, 26 Jul 2008 12:56:27 -0400, "daestrom"
> >
> >> Now, I pay about $1.25 / Therm for NG so that works out to about
> >> $250 / month in winter. If a heat pump runs at COP of 3 with this
> >> water, it would take about 1950 kW-hr a month to get the same 200
> >> Therms and that would cost me about $253 / month ($0.13/kWh). So
> >> that leaves nothing to 'pay' for the use of the water. Nor the cost
> >> of my heat pump upgrade.
> >
> > Sounds like you use a lot of electricity to heat your house...
> >
> > You would not use a heatpump with distributed heating. You get it
> > straight into your house, circulate it and return it(trough the
> > return-pipe).
> Well I agree with you there. But Neon John wants to distribute water at
> only 50F (10C). That is too cold to heat hot-water or your home directly.
> So he wants every house to have a heat-pump.