frankquietly

@Jeremy Harris Thank you for the floor heat loss calculator. Can I please check something, it seems to not consider the exposed perimeter / area ratio. My understanding is that ground floors in contact with the ground can have quite a low starting U value due to this ratio. For example my mid terraced house has an exposed perimeter of 16.1 metres, area of 36m2, hence a ratio of 0.45 m/m2. Using an online table gives a starting U value of 0.65 without any insulation (Gov scot floor u paper). Am I missing something here?

Hello, Please could someone spare a moment to point out why I'm a plonker? I've calculated my sub floor U value as 0.6 using the BRE perimeter:area method. This has been entered in the PHPP ground sheet The floor component has been setup with variants so I can model floor improvement However when I change the insulation values, PHPP recalculates the floor losses so they always stay the same. It seems whatever it has decided is the monthly heat flow on the ground sheet will carry through to the heating demand, regardless of the interior insulation value of the floor component. So when the U value changes the "Gt" in the heating sheet adjusts to keep the kWH/a the same Note I am only doing PHPP for geeky interest while I renovate my terraced house and would appreciate if anyone could help me understand.

Hello, have chipped off all the old cement render to discover some flint stone wall, soft red brick and breeze block (the very soft type), photos below. Quite the mix. I'm thinking of building back up with lime mortar in the gaps, lime parge coat, breathable insulation like wood fibre or cork, lime plaster. Does that sound ok considering the different walls? Any suggestion for a better approach? Gotchas?

Hello, I can't find a compatible hardware list for a melcloud connection for a PAC-IF063B-E controlling a PUHZ-W85VAA . Does anyone know if a MAC-587IF-E works?

Thank you for your help, @Jenki assume you meant TerryE, found the Fortran model info, very helpful. @SteamyTea as I was failing to model the concrete material as a power source, I decided to remodel it as a 3 layer onion. The inner core being water (this water layer being the thermostatically controlled power source), wrapped in PEX, wrapped in concrete. This has moved the power density problem to the water layer only, which at least makes it more searchable on the web, water heating being the defacto examples everywhere! I'll get into it again soon and see if can solve now it's a ?simpler? water problem.

Hello, I am new here, nice to meet you. Have been modelling a heated slab in Energy2d. I've come unstuck by "power density" (W/m^3). I am used to thinking of a heated slab in terms energy flux, say 50 W/m^2. My brains melts when I start thinking of how the power density is some relation to the energy input to the slab, the emissivity of concrete, a coefficient of temperature. Note I am keen to use power source in Energy2d as can control those with a thermostat. Appreciate any advice or pointers to research.