After much debate and very welcome input from various people I have made a decision in conjunction with our plumber on what radiator sizes we are going to use. As we now know that the under floor will be insulated and thermal plasterboard will be put on the walls I have decided to assume that to all intents and purposes that the rooms do not have solid walls and there are not three outside walls for each room.
Here are the final calculations for those that are interested.
Room | Size (WxDxH) | BTU Required | Rad Size | Rad BTU |
Bedroom2 | 3.65x3.05x2.3m | 3494.54 | 800x600mm | 4685 |
Bedroom 1 | 3.65x3.48x2.3m | 3987.21 | 800x600mm | 4685 |
Back Room | 3.65x3.05x2.5m | 4748.01 | 800x600mm | 4685 |
Front Room | 3.65x4.4x2.5m | 6849.59 | 1200x600mm | 7027 |
We are over specified on three radiators and slightly under on one. I think this will be fine and the slightly under specified unit will take some heat from the kitchen.
I have agreed the scope of works with the plumber today and he starts on Monday. If you want to see the pipe work diagrams he has them all on his blog here.
2 comments:
What is the R value of your thermal boards?
This is where I should be able to give you a precise figure and justify why we have selected the boards we have but in truth....... I have no idea!
We haven't bought them yet so I guess they will have the highest value possible without being too thick. Or perhaps it is me being too thick by using an approximate calculation.
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