"Neil Jones" wrote in message
...
"IMM" wrote in message
...
"Neil Jones" wrote in message
[snip]
Total losses for house = 12.3kW
Downstairs losses are 51.9% of total losses from house.
Losses through:-
Ground floor 4%
Downstairs solid wall 19%
Downstairs cavity wall 1%
Downstairs windows 6%
Ceiling to upstairs 3%
Roof 6%
Upstairs solid wall 18%
Upstairs cavity wall 2%
Upstairs windows 6%
Increase the loft insulation to 350-400mm and do the calcs again.
OK.
Thermal conductivity of mineral wool = 0.038
1/0.5 + (0.3/0.038) = 2 + 7.9 = 9.9.
U val = 1/9.9 ~ 0.10
Losses through ceiling reduced to 70 * 0.10 * 21 = 147W
Saving 588W, 5% of the total loss previously. How much does it cost to
buy 70 m2 loft insulation, at a depth of 300mm?
Also what
about the hallway which is also upstairs and downstairs.
What about it?
Must be regarded as a ground floor room.
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