RE: Boiler control update and query

["Dave McLaughlin" <dave@xxxxxxx>]

Hi Paul

Check out this graph. This is todays and tonights. The afternoon is very
similar to the evening with large fluctuations..

http://www.embeddedcomputer.co.uk/Projects/Controller/BoilerCharts/Images/im
ages.html

This has certainly got me thinking.

Regards
Dave...
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-----Original Message-----
From: Paul Robinson [mailto:ukcueman@xxxxxxx]
Sent: 17 December 2003 06:25
To: ukha_d@xxxxxxx
Subject: Re: [ukha_d] Boiler control update and query


Not only is the magnitude of the evening oscillations greater, but the
frequency is lower. About 2
peaks per hour instead of 5. Couple that with the fact that the peak of the
temperature oscillations
is around the same as the just-switched-off peak following the morning and
afternoon sessions, it
suggests that in the evening, the boiler is turning off more than it is
during the day. That would
give you the reduced frequency and bigger oscillations.

Maybe this is because, as Kevin suggested, after running for 2 hours,
everything has gotten warm and
so your central heating system can't lose heat to the house so quickly, and
so it needs to spend
more time turned off before it drops its temperature. The outside
temperature might help this
effect, depending on how well insulated you are, because the evening shows
as the highest outside
temperature making it harder for the central heating to lose heat.

Paul

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UKHA 2004: 15th and 16th May 2004

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