Ecohouse 2 by Sue Roaf
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Posted By: TimberWhat is the response time of the rest of the building? If timber frame with low thermal mass, a slow response time from the UFH system can cause issues with winter overheating, unless you have an intelligent control system.
Posted By: MarkBennettIf you're really near passiv then keep the temperature rise of the slab controlled. Don't use thermostats in the air, but bury them in the slab. Use them to control the heat flow and keep the slab more or less at your desired ambient temperature. That way, if the room heats up then no heat is transferred from the slab since there's no temperature differential.
Posted By: MarkBennettA normal UFH install provides around 10W/m2.K, which in PassivHaus terms means only a 1C rise to supply all the necessary heat even at peak load.
Posted By: MarkBennettIt's an elegant, if expensive, solution which also allows potential to use low temperature solar capture heat for space heating.
Posted By: tonyis a heating system even needed?
Posted By: borpinIn the ground floor 'bedroom' part of the house, I am intending the build-up to be Compacted base, Concrete, insulation, 65mm screed. This area will have minimal heating. In the main open plan area (about 36m2) I intend to have UFH from the Solar Thermal and the build-up would be compacted base, insulation, concrete then screed (with UFH pipes).
Posted By: Chris P BaconOf course to do that he needs to operate the solar panels via a drain back system. It also makes controlling the flow temperature in the slab impossible bar setting a minimum flow temp.
Posted By: davidfreeboroughPosted By: Chris P BaconOf course to do that he needs to operate the solar panels via a drain back system. It also makes controlling the flow temperature in the slab impossible bar setting a minimum flow temp.I can't see any reason why you couldn't use a 4 port mixing valve or a thermostatic head with separate solar & underfloor heating circulation pumps mixing at a low loss header.David
Posted By: tonyIn general it is not possible to catch enough heat via solar panels to heat a house in winter, it can help. It is probably better to spend on insulation during construction while it is easyI have UFH pipes installed but have never filled them or used them (air tested) insulation and air tightness work for me.
Posted By: Chris P BaconThanks to your blog post borpin I took a look at your house design this morning. I'm no expert on this but relating this to my own calculations I think you will struggle to install enough solar panels on you South West facing roof to get a high solar fraction of your heating demand.
Posted By: Chris P BaconThe company supplying my frame are saying that they expect the house to perform significantly better than it does on paper and they have data from a number of previous builds to back that up, I am not counting on it but it would be a nice bonus if it happens.
Posted By: davidfreeboroughI would put all the insulation under the slab, put underfloor heating pipes in the slab to all areas & power float the finish so that no screed is required.
Posted By: borpinI intend to have UFH from the Solar Thermal.
Posted By: Chris P BaconHow many m2 of solar panels are you going to fit? What is there predicted output during the heating season?
Posted By: tonyam already saving excess heat for next winter
Posted By: orangemannotI have not had the underfloor heating on in three weeks, but the central located wall theromometer reads 17 deg C , and if? perhap?s I light the logburner in the front room later, it will................,inside of 15/25 minutes force us to open the door to the stairwell, to cool down.
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