CeeJay Posted February 1, 2008 Share Posted February 1, 2008 I am trying to calculate the heat loss from my house in 34 and ultimately attempting to guage size of proposed radiators for a new gas central heating system. Could anyone please tell me what U value I would enter into the calculations for an 18" thick outside wall built of the local large granite pebbles from the nearby river? Link to comment Share on other sites More sharing options...
powerdesal Posted February 2, 2008 Share Posted February 2, 2008 [quote user="Ceejay"]I am trying to calculate the heat loss from my house in 34 and ultimately attempting to guage size of proposed radiators for a new gas central heating system. Could anyone please tell me what U value I would enter into the calculations for an 18" thick outside wall built of the local large granite pebbles from the nearby river?[/quote] Ceejay, I had a similar question some long time ago and, as there are many and varied methods of solid stone construction I just assumed the value of concrete would apply and did it that way. Idont think its of mega importance because its really only the outsidewalls that have the delta T unless you are giving each internal room adifferent set point. I have assumed all internal rooms are 20 deg Cwith outside at -1C. Thus no internal heat transfer thro the internalstone walls. As we all round up the end numbers and then try to findrads to match whilst assuming a radiator performance factor the neteffect of getting the U value 'less than correct' is substantiallydiluted. Link to comment Share on other sites More sharing options...
CeeJay Posted February 2, 2008 Author Share Posted February 2, 2008 SteveThanks for that reply, I agree 'tis better to round up than down. Link to comment Share on other sites More sharing options...
Nicos Posted February 2, 2008 Share Posted February 2, 2008 Remember you can always turn the radiator down or off...it's when it's -6 C that you'll be needing to feel warm! Link to comment Share on other sites More sharing options...
Michael Posted February 2, 2008 Share Posted February 2, 2008 Nicos. My U values on most solid type walls are always calculated on a 18inch solid brick wall,U=.265 based on an outside temperature of 30degree F,rooms or buildings 1.5 air changes per hour, in really exposed conditions i add 10%. Michael. Link to comment Share on other sites More sharing options...
powerdesal Posted February 3, 2008 Share Posted February 3, 2008 Whats a "Degree F" ???????????[:P] Link to comment Share on other sites More sharing options...
Valleyboy Posted February 3, 2008 Share Posted February 3, 2008 Imperial currency??? Link to comment Share on other sites More sharing options...
Michael Posted February 3, 2008 Share Posted February 3, 2008 I thought it would bring a smile,but I still do all my calcs in the Roman age. Nicos will prob just add 15 and double it..Anyway the question he asked was answered -- without a lot of waff. Brussels has not sent me a directive to work in Centigrade yet.and as far as I'm concern B.T.U.s still rules Michael . [In UK at the moment with my thermals on, in my house with 2ft thick stone walls thinking about increasing my rad sizes] Link to comment Share on other sites More sharing options...
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