Re: quick advice for new home build

["David Buckley" <db@xxxxxxx>]

This is straight heat pump technology.

a) A better way of saying "75% free" is that the system moves
three times as
much heat as electricity it consumes, under good conditions.

b) Heat pumps work most effieicntly (as do fridges) the closer the source
and destination temperatures are.  Think of a heat pump as pushing a stone
up a hill; the less far it has to push, the easier it is.  Thus heat pump
technology is ideally suited for undefloor heating, as the water
temperatures are low.

c) I'm sure what you are proposiong isnt called geothermal.  Geothermal
usually gets heat from far below ground.  The low depth stuff has a name,
but I've forgotten it.  However, this is essentially solar heating (!)



----- Original Message -----
From: "James Hoye" <james.hoye@xxxxxxx>
Newsgroups: tex.com.ml.ukha_d
Sent: 04 January 2002 12:54
Subject: Re: [ukha_d] quick advice for new home build


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> ---------------------------------------------------------------
> > >1. Heating. My present plan is for a Geothermal Heat pump and
> > >underfloor heating (although maybe radiators for upstairs).
An
> > >additional heater for temporary high output requirement(baths
etc.)
> > >The Geothermal is supposed to be 75% free.
> >
> > Wow. I didn't think that stuff would work in the UK. I assume the
> Geothrmal
> > element is using deep clay as a heat resevoir? so it will keep
the house
> > cool in summer, warm in winter?
>
> I believe that there is a loop of pipe buried at a depth of 2-3m where
the
> temperature remains fairly constant.  Compressed refrigerant is then
pumped
> through this loop (or via a heat exchanger) where it absorbs the heat.
The
> condensor on the other side dumps this heat - just like an air
conditioning
> system but in reverse - you effectively try to cool the ground, and
utilise
> the heat from the condensing process.
>
> I also believe that the compressor is a mighty 3kW beasty that costs
several
> grand and runs best on off-peak electricity ;)
>
> James H
>
>
>
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