Reading lots on the web did not really make this any clearer. But I don't know what I'm trying to target, is higher flow better, is lower Delta T better. On the first floor the DT is 4.1 degrees and the flow rate of 1.6l/m, total flow rate of 18l/m.
#JOIN TWO CIRCUITS IN LOOPCAD SOFTWARE#
If I let the software calculate the Delta T, ground floor DT is 2.8 degrees with a flow rate of 2.4l/m. In Loopcad, if I set the Delta T to enforced fixed at 5 degrees, I get a flow rate of 1.42l/m on all circuits, giving a total of 15l/m flow rate. The flow rate and Delta T were the main areas, I don't really understand. I used JH's Heating Requirements spreadsheet and the heating requirements from Loopcad, the two figures were quite close to each other: "Total daily heat loss power for minimum OAT (W) 4147" (30 default in LoopCad, 23 hottest that should be need, actuals will probably be different.) In Loopcad water temp 30 degrees, target room temp 23 degrees. Hopefully insulated raft with UFH.īased on various threads here, I have a very simplistic UFH design at present.ġ Manifold ground floor with 6 loops all 95m, 200mm spacingġ Manifold first floor with 4 loops all 95m, 200mm spacing Trying to get the Foundation design finalised. I'm still at the pre-building controls submission stage. The heat pump then uses the tank stat on the buffer to fire rather than the call for heat from the UFH controller as it is less likely to short cycle or find flow restricted. I’d use a small buffer - 60-100litre - and let this do the balancing to the ASHP. The floor flow is set by the manifold circulation pump, not the ASHP pump and it’s a bad idea to just connect the ASHP to the manifold and hope it runs ok as the zones closing will play havoc with the flow. Ignore that entirely !! That’s the flow the ASHP needs, not the floor. That needs a lower flow temp and closer to the final room / slab temp you’re looking for so ideally it’s nearer the 35c flow (most ASHP have 35c as optimum for CoP) blended with the return water. If you’re using ASHP as a heat source then you really want to be using E7 and overnight - slab on at 3:30am to absorb low grade heat for 3 hours etc. It is also designed to get the room temperatures up within 60 minutes from memory - there is a set of parameters hidden somewhere and you can alter these. Yes but I expect the dT is something like 8c based on 45/37 which is the hot end and traditional flows. And if those same runs could go through the "NO UFH" room (with insulation) then that gives them a very much more direct route to the manifold. Just insulate the short sections of pipe going under the units. In the kitchen, I can see why you want no heating under the units but I would pass the pipes to and from loops 1-10, 1-11 and 1-12 under that peninsular run of units just to save the congestion going around the units. I am surprised bed 1 needs 2 loops I would be tempted to make that just one, that is another less port on the manifold and less congention in that hall. I take it the room left of the kitchen is a pantry hence no UFH? If you can pass pipes under the internal walls you can get some much better pipe runs Why only go through doorways? Why no UFH in the bathrooms? It is really nice to have a warm floor in the bathrooms. That will be all the heating you want in the hall. Instead just space out all the pipes that are passing through the hall. The landing one NEVER came on, and the hall one only very rarely. In our previous house on the advice of the UFH designer we had a loop in the hall and one on the landing. I'm designing a project with in-floor radiant heating tubes.Forget the UFH loop in the hall.
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