PCM Filled Glazing
Posted 16 March 2016 - 09:09 PM
Posted 17 March 2016 - 07:48 AM
However, the abstract intrigues.
Might there be a more 'informal' way of accessing the text?
Posted 17 March 2016 - 07:57 AM
And natch I wonder if it might be better between the two inside-facing panes of 3G...
Posted 17 March 2016 - 08:03 AM
Does mention our favourite term on page 4
And a 1240 page report on building science from the Southern Hemisphere
Bored now, going to hang my washing out as it is sunny
Edited by SteamyTea, 17 March 2016 - 08:16 AM.
Posted 17 March 2016 - 08:28 AM
Posted 17 March 2016 - 08:31 AM
A fair bit of info if you simply google "Phase change material (PCM) applied in the glazing structure".
Edited by joiner, 17 March 2016 - 08:37 AM.
Posted 17 March 2016 - 08:32 AM
What's PCM in this context?
Edited by joiner, 17 March 2016 - 08:36 AM.
Smartphones! What's a "parsgraph" and "telking"?
Posted 17 March 2016 - 08:35 AM
Going to watch my washing as it changes phase from wet to steam to dry.
Posted 17 March 2016 - 08:38 AM
Posted 17 March 2016 - 08:59 AM
Phase change is quite simple. Imaging a material that can be solid, liquid or a gas, water is a good example.
Each state will have different thermal properties at different temperatures.
So the heat capacity of ice is different from liquid water or steam.
During the crossover from one phase to another, the temperature stays the say i.e. 0°C or 100°C but the water still releases energy (or absorbs energy).
The numbers can sometimes seem to be totally different from what happens when the material is in just one phase.
So ice has at 0°C:
Density of 916.2 kg/m3 , Thermal Conductivity of 2.22 W/m.K and a heat capacity of 2.050 kJ/kg.k
Liquid water has at 0.1°C:
Density of 999.8 kg/m3 , Thermal Conductivity of 0.563 W/m.K and a heat capacity of 4.217 kJ/kg.k
Steam at 100°C
Density of 0.6 kg/m3 , Thermal Conductivity of 0.0188 W/m.K and a heat capacity of 2260 kJ/kg.k
So you can see that by changing the phase of a material you can release (and store) different amounts of energy (the heat capacity), at different rates (the conductivity) in different volumes or masses (the density).
The trick is to find a material that changes at a temperature that is useful (around 25°C for space heating, 50-60°C for water heating) that has a large positive change in heat capacity at those temperatures, takes up little space and is cheap and safe to use.
And when it comes to being used in windows, transparent.
Edited by SteamyTea, 17 March 2016 - 09:00 AM.