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Introduction to Phase Change Materials #PSBPcomfort

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Presentation by Ian Biggin – Director, Phase Energy Limited
More information: https://storify.com/subutcher/cost-effective-thermal-comfortsolutions-for-the-p

Published in: Design
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Introduction to Phase Change Materials #PSBPcomfort

  1. 1. Introduction to Phase Change Materials Phase Energy Ltd Thermal Comfort Event 10th February 2015
  2. 2. What are PCMs? 1kg 0oC 1kg 80oC 334 kJ/kg334 kJ/kg  PCMs are latent (hidden) heat storage materials i.e.:  They store or release large amounts of heat as they change phase (solid liquid)  They store or release heat without changing temperature Thermal Comfort Event, 10th February 2015 2
  3. 3. PCMs – “clever” thermal mass PCMs are thermal mass, NOT insulation!  Idealised graph Heat Energy Latent Heat Solid Liquid Temp. Tp Thermal Comfort Event, 10th February 2015 3
  4. 4. Effective packaging  Microencapsulation provides effective packaging in open porous support materials  Huge surface area – good heat transfer  Building materials with PCMs provide passive thermal comfort 2µm Polymer shell Wax Fp: 23°C DH: 100kJ/kg1-5µm Thermal Comfort Event, 10th February 2015 4
  5. 5. How do they work in construction?  PCMs provide thermal mass  Unlike concrete, brick etc. they provide most of their effect over a narrow temperature range  Act like lightweight structure above and below their melt/freeze temperature range  Act like a heavyweight structure around the “comfort range”  Heat up and cool down quickly but buffer effectively in the comfort range 0 50 100 150 200 250 300 40 mm Concrete (80 kg/m2) 18 mm OSB (11.7 kg/m2) 12.5 mm Plasterboard (11.25 kg/m2) CoolZone ceiling tile (25kg/m2) 89 22 13 31 89 22 13 140 89 22 13 31 16 - 20oC 20 - 24oC 24 - 28oC Idealised heat storage capacity (Wh/m2) Thermal Comfort Event, 10th February 2015 5
  6. 6. Heat absorbed vs. temperature Thermal Comfort Event, 10th February 2015 6
  7. 7. Where to use PCMs?  For any thermal mass to be effective it should be in contact with room air Wall construction U-value W/m2K Admittance W/m2K Kappa value kJ/m2K Plaster 13 mm Brick 100 mm Brick 100 mm 2 4.26 169 Plasterboard 13mm Mineral wool (quilt) 150 mm Plaster 13 mm Brick 100 mm Brick 100 mm 0.24 0.73 9 Drywall 13 mm Cavity 10 mm Aerated block 100 mm Cavity 150 mm (Mineral wool) Brick 100 mm 0.19 1.86 9 Values are estimates based on the Arup/Concrete Centre software Thermal Comfort Event, 10th February 2015 7
  8. 8. Should they be used by themselves?  PCMs, like sensible thermal mass, should be used in conjunction with other temperature control measures e.g.:  Insulation  Shading  Orientation  Ventilation Ideally this should be night-time purge ventilation (3 – 5 ach) not just MVHR (0.3 - 0.5 ach) The heat stored in the thermal mass should be released overnight Thermal Comfort Event, 10th February 2015 8

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