Using 600mm flow temperature required goes up to 34.2C (DT of 7C) for same output.Īnd peak output with 45C flow temperature: Using 450mm flow temperature required goes up to 32.6C (DT of 7C) for same output. Using 300mm flow temperature required goes up to 30C (DT of 4C) for same output. Using 150mm, flow temperature required drops to 29C (DT of 4C) for same output. Using 200mm, the required flow temp is 29.3C (DT of 4C) to achieve floor temperate of 23C and output of 22 W/m2. On the spacing LoopCAD gives me the the following: Isn't epoxy a plastic and therefore signifcinalty more insulating? I assume there are various non-epoxy self-levelling compounds also though. I assume 200mm will mean more circuits to cover floor area and a larger manifold though). (althought not sure what we'd loose by using 200mm instead of 300mm if it's the same cost. Also interested to see if spacing can be increased to 300mm or more and still supply the heat load required with ASHP temp <=35C. From initial experimentation it looks spot on! I still like playing with the paremters myself though. Be interesting to see how closely LoopCAD numbers match Harris table here. I have a few other questions on UFH, but will save those for a sperate thread once I've got things modelled.
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Maybe the 10mm levelling compound isn't justified, but I'm pretty sure we'll use some and might need to use the full 10mm if we want to ensure level-thresholds still work (currently our FFL is 35mm above slab). I can't find any data anywhere that tells be the r/rsi/tog value of products like this though, and concern if might be a bad (or worse) than a thick carpet depending on the product. 75% of the ground floor will almost certainly be targe format porclain tiles, and 25% engineered wooden flooring but our architect has allowed for 10mm self-levelling compound on top of the floated slab. What I'm not sure is what to use for r-value of flooring. PHPP gives 15W/(ground floor m2) as heating load for the whole house. Heating demand: M&E guy has calculated 20W/m2 on average using standard heat-loss calcs down ground floor rooms only. This is an MBC passive slab so I'm using: LoopCAD takes into account the depth of concrete, height of UFH pipes in concrete, u-value of insulation under concrete and the heatingd demand of each zone and even the type/size of UFH pipe. Given I like to understand/play with the details rather than just take someones word for it, I'm using LoopCAD to model the circuits and their required/actual floor surface temperatures to meet the heat load at different spacings and flow temperatures. and I'm keen to ensure that we get things right to enable us to run at low temps and still cover our heating demand. We are currently working out UFH zones/spacing etc.
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