Can you explain the inertia effect please.
I think it goes like this.
It's very much like electric room storage heaters. The fire bricks inside the heater, which are high mass, take-on-board heat from an electrical element and stocks it until needed. It then gives it back on demand.
In the case of high mass insulation, the walls mass is charged while the room air temperature is higher than the walls temperature. It then gives back the heat when the temperatures are reversed i.e wall temperature higher than room air temperature. The trick is to have as little ‘lost’ heat energy in this process, heat traversing right through the wall to the outside. I’ve found that cavity walls with the likes of Thermalite on the inside and cavity fill insulation have a similar effect. The room takes longer to heat up, charging the walls mass (blocks) but stays warm for longer once the heat source has been cut, giving back stocked heat as it has not been allowed to pass the cavity insulation.
Walls constructed with very little mass on the heat source side (inside) and before the insulation layer, like timber framed structures, have higher fluctuations in temperature as it only takes an air change to remove the majority of the applied heat, no mass to stock the heat.
Higher Mass = Equitable climates, a bit like the uk surrounded by the mass of the sea acting as a huge heat sink.
Some say that mass insulation has no place in modern living as we spend more and more time out of the home and therefore is better to have quick reacting heating systems that only heat the air on demand. Because of this, we also rely more and more on Air Conditioning in hot weather.
I’ve used these blocks because during the summer the blocks are very good insulators from the suns heat and also extract heat from the inside air as the blocks are cooler (heat sink). In the evenings/night when the outside air temperatures are lower, I’ll run basic air circulation, or even just open windows to release the heat extracted by the blocks during the day. Hopefully no need for Air Con, which I can’t stand.
Sorry for lengthy explanation.