[sclug] sclug Digest, Vol 116, Issue 12

[Neil Haughton]

On 23 May 2013 13:00, <sclug-request at sclug.org.uk> wrote:

> Send sclug mailing list submissions to
>         sclug at sclug.org.uk
>
> To subscribe or unsubscribe via the World Wide Web, visit
>         http://sclug.org.uk/mailman/listinfo/sclug
> or, via email, send a message with subject or body 'help' to
>         sclug-request at sclug.org.uk
>
> You can reach the person managing the list at
>         sclug-owner at sclug.org.uk
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of sclug digest..."
>
> Today's Topics:
>
>    1. Re: sclug Digest, Vol 116, Issue 11 (Neil Haughton)
>    2. Re: Wood vs GHC (Bob Dunlop)
>    3. Re: sclug Digest, Vol 116, Issue 11 (John Stumbles)
>    4. Re: Wood vs GHC (John Stumbles)
>
>
> ---------- Forwarded message ----------
> From: Neil Haughton <haughtonomous at googlemail.com>
> To: sclug at sclug.org.uk
> Cc:
> Date: Wed, 22 May 2013 13:08:42 +0100
> Subject: Re: [sclug] sclug Digest, Vol 116, Issue 11
> On May 22, 2013 1:00 PM, <sclug-request at sclug.org.uk> wrote:
> >
> > Send sclug mailing list submissions to
> >         sclug at sclug.org.uk
> >
> > To subscribe or unsubscribe via the World Wide Web, visit
> >         http://sclug.org.uk/mailman/listinfo/sclug
> > or, via email, send a message with subject or body 'help' to
> >         sclug-request at sclug.org.uk
> >
> > You can reach the person managing the list at
> >         sclug-owner at sclug.org.uk
> >
> > When replying, please edit your Subject line so it is more specific
> > than "Re: Contents of sclug digest..."
> >
> > Today's Topics:
> >
> >    1. Re: Wood vs GHC (John Stumbles)
> >
> >
> > ---------- Forwarded message ----------
> > From: John Stumbles <sclug at yaph.org.uk>
> > To: sclug at sclug.org.uk
> > Cc:
> > Date: Wed, 22 May 2013 10:25:32 +0100
> > Subject: Re: [sclug] Wood vs GHC
> > On 17/05/13 09:33, Bob Dunlop wrote:
> >
> >> If I ever get my grandiose schemes off the ground I'd like to link
> various
> >> other inputs to my system.  A lot would be about attempting to predict
> >> future conditions to avoid running the heating unnecessarily.  So for
> >> example if the output from my solar PV system has been high for the day,
> >> I can predict that the living areas of the house will have benifited
> from
> >> a good level of passive solar heating, since this means I'm unlikely to
> >> need to run the central heating for room heating I would be better to
> >> provide the hot water demand by running the immersion heater than the
> >> boiler.
> >
> >
> > circa 12p/kWh peak rate electricity versus c. 3p for gas?
> > How inefficient is your CH system?!
> >
> > --
> > John Stumbles                                       http://yaph.org.uk
>
> All the heat from the immersion element goes into the water it is heating.
> A lot of  the latent heat in the gas goes up the flue or is lost from the
> boiler itself and the piping from boiler to water tank.
>
> The gap in price per kWh of useful heat is not as great as you might think.
>
> Neil.
> > :-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:-:
> >
> >
> > _______________________________________________
> > sclug mailing list
> > sclug at sclug.org.uk
> > http://sclug.org.uk/mailman/listinfo/sclug
>
>
>
> ---------- Forwarded message ----------
> From: Bob Dunlop <bob.dunlop at xyzzy.org.uk>
> To: sclug at sclug.org.uk
> Cc:
> Date: Wed, 22 May 2013 15:39:52 +0100
> Subject: Re: [sclug] Wood vs GHC
>
> On Wed, May 22 at 10:25, John Stumbles wrote:
> > On 17/05/13 09:33, Bob Dunlop wrote:
> ...
> > > a good level of passive solar heating, since this means I'm unlikely to
> > > need to run the central heating for room heating I would be better to
> > > provide the hot water demand by running the immersion heater than the
> > > boiler.
> >
> > circa 12p/kWh peak rate electricity versus c. 3p for gas?
> > How inefficient is your CH system?!
>
> Heating oil is about 7p/kWh and heating water to indirectly heat more
> water in a tank 50 feet away can't be efficient.  Then the boiler is
> over 20 years old and won't be as efficient as a modern one even if
> serviced regularly.
>
> We're begining to burn out fuel pumps regularly since they removed the
> sulphar lubrication from the oil, and I'm told that modern replacement
> condensing oil boilers only have a usable life of about five years.
>
> Just hoping to hold it together long enough for heatpumps of some sort
> to become viable.
>
> Then again the quote for getting mains gas was something like 15 grand.
>
> --
>         Bob Dunlop
>
>
>
I'm puzzled - why did you move to Caithness? Wouldn't Tenerife have been
more suitable? :-)

Neil.