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UK RICS report says solar takes 208 years to repay...nonsense! Help needed! - Page 5

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Posted by Mary Fisher on October 15, 2007, 12:00 pm
 


Also, for the solar system we have no secondary coil is needed.
Mary



Posted by Peter Parry on October 15, 2007, 1:41 pm
 
On Mon, 15 Oct 2007 12:51:09 +0100, David Hansen


It is still advised as a method of getting the most from an active
solar system.

"neither [flat panel nor evacuated tube] system can be guaranteed to
continue to give the maximum possible output once more intrusive
auxiliary heating schedules are introduced. Operation of the system
in preheat mode removes this potential source of performance
degradation, and will generally be a more robust configuration."

FURTHER TESTING OF
SOLAR WATER HEATING SYSTEMS
ETSU S/P3/00275/00/REP/3
DTI/Pub URN 02/1402
--
Peter Parry.  
http://www.wpp.ltd.uk/  

Posted by David Hansen on October 16, 2007, 8:12 am
 On Mon, 15 Oct 2007 14:41:58 +0100 someone who may be Peter Parry


If the "intrusive auxiliary heating system" is controlled separately
from the solar system. However, if they are controlled together, by
the same controller or controllers which speak to each other, then
any such problem does not arise.


--
  David Hansen, Edinburgh
 I will *always* explain revoked encryption keys, unless RIP prevents me
 http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54

Posted by Peter Parry on October 16, 2007, 8:38 am
 On Tue, 16 Oct 2007 09:12:59 +0100, David Hansen


Apparently they do as it has little to do with control and more to do
with patterns of usage.  Most people want hot water in the morning so
auxiliary heating (for most of the year) kicks in before they rise as
the storage tank will have been depleted by evening use (the other
peak period).  Temperature stratification in the relatively small
storage tanks typical of domestic installations is fairly poor so the
solar system for the rest of the day is trying to preheat already
warm water.  Giving the solar system its own pre-heat tank means that
at the start of the day the pre-heat tank is invariably cold (as most
domestic hot water usage is evening and morning) and during the day
the solar panel can work at its best.  For those with room for a
pre-heat tank it allows them to get the most from a solar hot water
system and makes the system overall relatively immune to the usage
pattern.
--
Peter Parry.  
http://www.wpp.ltd.uk/  

Posted by David Hansen on October 16, 2007, 10:15 am
 On Tue, 16 Oct 2007 09:38:55 +0100 someone who may be Peter Parry


Only if the system is not properly sized, just as it will not work
properly if the controls are not properly designed or any number of
other things are not done.

Of course sizing the system properly does generally involve more
than adding some bits, which pushes the cost up.



--
  David Hansen, Edinburgh
 I will *always* explain revoked encryption keys, unless RIP prevents me
 http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54

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