I am trying to design my central heating system and am having difficulty finding some U values. The building is a 1930's bungalow so is not constructed with any modern standards where U values are readily available. I need U values for
Solid concrete floor (i believe is 2, assumed to be the ground)
uninsulated cavity brick wall - 1.4?
ceiling to loft space. Is this calculated as part of the roof? If so is ther a U value for ceiling with 200mm insulation, loft space, felt and concrete tiles?
Is there an addition for heat loss that should be added for having an open fire place? of should i increase the ventilation rate to 5 air changes an hour to accomodate this?
Help appreciated
thanks
Solid concrete floor (i believe is 2, assumed to be the ground)
uninsulated cavity brick wall - 1.4?
ceiling to loft space. Is this calculated as part of the roof? If so is ther a U value for ceiling with 200mm insulation, loft space, felt and concrete tiles?
Is there an addition for heat loss that should be added for having an open fire place? of should i increase the ventilation rate to 5 air changes an hour to accomodate this?
Help appreciated
thanks