B
BigBurner
What you are attempting is fine. As said, insulate heavily under the pipes and no more than 50C pipe temps.
Look at this:
http://www.bes.co.uk/products/117.
http://www.bes.co.uk/products/116.asp
The UFH heating needs to be blended down to 50C. This can be done by setting the boiler to 50C, which may be too cold for the other rads and DHW, or by blending the hot water from the boiler with cooler return water from the UFH loop. A blending valve and pump is then needed, also some form of controlling the room temperature, either mechanical or electric.
I know someone who did something similar. He used 8mm copper coiled pipe. He clipped it to the side of the joists, about half way down, all along the length of each joist in one continuous loop. He use two loops to even out the heat - hottest in the centre of the room. The pipe did not touch the joists, running though joists through 3/4" holes.
The control was a simple room and zone valve. The boiler was set to 65-70C.
His boiler is old and he plans to fit a condensing boiler I suggested a Broag using a 3-way valve DHW priority system, ramps the boiler temp top max when heating DHW. He plans to put UFH in a similar way under all his suspended ground floor. I told him to put larger rads upstairs and run the lot on the weather compensator, with 55c max temp on the compensator slope.
Look at this:
http://www.bes.co.uk/products/117.
http://www.bes.co.uk/products/116.asp
The UFH heating needs to be blended down to 50C. This can be done by setting the boiler to 50C, which may be too cold for the other rads and DHW, or by blending the hot water from the boiler with cooler return water from the UFH loop. A blending valve and pump is then needed, also some form of controlling the room temperature, either mechanical or electric.
I know someone who did something similar. He used 8mm copper coiled pipe. He clipped it to the side of the joists, about half way down, all along the length of each joist in one continuous loop. He use two loops to even out the heat - hottest in the centre of the room. The pipe did not touch the joists, running though joists through 3/4" holes.
The control was a simple room and zone valve. The boiler was set to 65-70C.
His boiler is old and he plans to fit a condensing boiler I suggested a Broag using a 3-way valve DHW priority system, ramps the boiler temp top max when heating DHW. He plans to put UFH in a similar way under all his suspended ground floor. I told him to put larger rads upstairs and run the lot on the weather compensator, with 55c max temp on the compensator slope.
