Hi
I have tried to calculate the rad sizes but I am just not confident they are correct. Does the figures below seem ok?
It's an 1980's first floor flat, roughly 55m2, with uninsulated cavity walls. Inner block wall is made from bubbly looking concrete type blocks assumed a total external wall U value of 1.4. Floor and ceiling are concrete with 22mm chipboard sub floor, have assumed u values of 1.4 for floor and 1.7 for ceiling. Internal walls are only 2" stud walls with 9.5mm plasterboard, have assumed u value of 2. I have assumed the rooms below and above are heated. Outside design temp is -3C and I am designing for a flow of 70C and return of 50C to condensing combi.
Lounge/dinner (21C) - 5.5m x 3.2m x 2.44m - North facing - 2296W
Kitchen (18C)- 3.2m x 2.4m x 2.44m - North facing - 536W
Bedroom 1 (19C) - 4.5m x 3.2m x 2.44m - 1225W
Bedroom 2/Study (21C) - 3.2m x 2.4m x 2.44m - 850W
Bathroom (22C) - 2.4m x 2m x 2.44m - 463W (No windows)
Hall (18C) - 1.3m x 4m - 430W
Do these fiqures seem right?
Thanks
Pete
I have tried to calculate the rad sizes but I am just not confident they are correct. Does the figures below seem ok?
It's an 1980's first floor flat, roughly 55m2, with uninsulated cavity walls. Inner block wall is made from bubbly looking concrete type blocks assumed a total external wall U value of 1.4. Floor and ceiling are concrete with 22mm chipboard sub floor, have assumed u values of 1.4 for floor and 1.7 for ceiling. Internal walls are only 2" stud walls with 9.5mm plasterboard, have assumed u value of 2. I have assumed the rooms below and above are heated. Outside design temp is -3C and I am designing for a flow of 70C and return of 50C to condensing combi.
Lounge/dinner (21C) - 5.5m x 3.2m x 2.44m - North facing - 2296W
Kitchen (18C)- 3.2m x 2.4m x 2.44m - North facing - 536W
Bedroom 1 (19C) - 4.5m x 3.2m x 2.44m - 1225W
Bedroom 2/Study (21C) - 3.2m x 2.4m x 2.44m - 850W
Bathroom (22C) - 2.4m x 2m x 2.44m - 463W (No windows)
Hall (18C) - 1.3m x 4m - 430W
Do these fiqures seem right?
Thanks
Pete