Discuss How good is underfloor heating in a large room in the Electric Underfloor Heating Wiring area at ElectriciansForums.net
and now he's got 10 years.Think of poor Jake the Peg, he needed 3 socks.
Our kitchen has a solid concrete floor - I believe it's insulated. But no amount of insulation will make an unheated slab of concrete anything other than a cold slab of concrete. Even with two pairs of sock and slippers it's 'kin cold underfoot. Yes most new-builds I've looked over the wall at have all had unheated slabs of cold concrete to make sure the occupants always have cold feet ? And of course, with a solid concrete floor, it's the hardest to retrofit UFH to.It stays on all day in the winter keeping my feet lovely and warm. It also costs a bloody fortune!!!!! I wish I'd bought a pair of slippers!
Nice theory, but unfortunately it doesn't work like that. The mass of earth is very good at conducting heat away, and for design purposes, you can consider the oversite concrete to be a constant 5 degrees.But actually, apart from around the outside, insulation doesn't make much difference to energy requirements. In the middle of the room, you've got "lots of thickness" of earth underneath. So while it will take a lot longer to heat up, once heated up it won't take more energy.
Which is (I assume) a true statement, but does not actually support your blanket statement. "For design purposes" really means "if you want to avoid calculating actual figures, then this will be near enough for common situations". U (or R) values for soil varies significantly, but it DOES have thermal resistance, and it is not "negligible".... for design purposes, you can consider the oversite concrete to be a constant 5 degrees.
"Dry UFH system(water pipe)" - so that's pipes carrying hot water embedded in (e.g.) a concrete slab ? We call that a wet UFH system because the heat carrying medium is water. If you say dry, then to most of us (or at least to me) that implies no water, so probably electric.In China, we recommend Dry UFH system(water pipe), save one third of the gas cost compared with the traditional wet method, also fast heat up, while the initial installation cost is slightly higher.
Ah, so same problem as here then - lecky costs a lot more per unit of energy than gas does.We also provide electric system, however the result is low market acceptance in China, for example Shanghai, due to the cost.
I don't quite follow that. I read it as the property was built with UFH by the developer - but the resident came to you to install UFH ? Or was it electric originally installed, and you replaced it with a wet (water) system ? Or something else ?A resident of a residential area with pre installed floor heating by a developer found us and installed floor heating, and then compared it with other residents in the same residential area.
Dear Simon,"Dry UFH system(water pipe)" - so that's pipes carrying hot water embedded in (e.g.) a concrete slab ? We call that a wet UFH system because the heat carrying medium is water. If you say dry, then to most of us (or at least to me) that implies no water, so probably electric.
Ah, so same problem as here then - lecky costs a lot more per unit of energy than gas does.
I don't quite follow that. I read it as the property was built with UFH by the developer - but the resident came to you to install UFH ? Or was it electric originally installed, and you replaced it with a wet (water) system ? Or something else ?
Good afternoon, Mike,In the UK, all of Europe and the USA any underfloor heating that contains water pipes is called WET, any electric UFH is called DRY, the type of construction is not taken into account. China's floor heating market is only of academic interest to most on here.
Very much so, and why water UFH makes more sense as it can be fed from a heat pump.Ah, so same problem as here then - lecky costs a lot more per unit of energy than gas does.
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