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Terry and Janet Ellisons adventures in building their new home at the bottom of their Farmhouse garden

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How an MBC WarmSlab Has Actually Performed based on 6 Years Data

In my topic Modelling the "Chunk" Heating of a Passive Slab, I discussed how I used a heat flow model to predict how my MBC WarmSlab heated by UFH + Willis heater would perform.  What I wanted to do in this post is to provide a “6 years on” retrospective of how the house and slab have performed as built based on actual data that I’ve logged during this period, and to provide some general conclusions. In this, I assumed 15 mm UFH pipework, but we actually used 16mm PEX-Al-PEX pipework with a

TerryE

TerryE in Heating

Update on Timeshifting to Minimise Heating Costs.

When we first decided to self-build in 2014, Jan and I visited quite a few passive house builds and talked to various experts;  we soon decided that a low energy approach was broadly the way to go for our build.  One of these experts, a passive-house evangelist called Seamus O'Loughlin, emphasised that a conventional heating approach (where boiler demand is based on some central thermostat set point) doesn't work well in a passive house, because the time constants of a high-thermal capacity low

TerryE

TerryE in Heating

Heating the Slab – an overview

We have a passive-class house where the net heating requirement to keep the house warm in the coldest winter months is approximately 1kW.  The only heating system for doing this an underfloor heating (UFH) system base on 3 ~100m UFH loops buried in our passive slab.  That's it; no upper floor systems; no towel rails; nothing.  The reason for this is that our timber framed house is super insulated and air tight so there is very little temperature variation throughout the house, but that's all bee

TerryE

TerryE in Heating

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