Analysis of Thermal Bridges - Scottish Energy Systems Group ...

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837mm Mineral wool 250mm, 0.037W/mK 37mm 311mm Wood, 0.13W/mK Mineral wool 115mm, 0.037W/mK 100mm Fire stop 55mm, 0.045W/mK plasterboard 12.5mm, 0.21W/mK Plywood 10mm, 0.13W/mK brick 103mm, 0.77W/mK 800mm Scottish Energy Systems Group Air cavity 55mm, 0.306W/mK 2D model section with materials and dimensions samuel@esru.strath.ac.uk
BRE 497 Roof junction boundary condition conventions (Not CEPH conventions) U`R Roof eaves (insulated at ceiling) T e T L U`C • It is usual to take T i =20 0 C and T e =0 0 C • A heat balance between U`R and U`W ψ = l c T l i w L − l × U′ − l × U′ W W C C U`C can give T L • For ventilated ceilings T L ~T e but ventilation component of U`R is not generally known. T L is taken as 1 0 C for such cases. • R se of 0.10m 2 K/W is taken for the upper surface of the loft space. Scottish Energy Systems Group samuel@esru.strath.ac.uk
Page 1 and 2: Scottish Energy Systems Group ... e
Page 3 and 4: Thermal Bridging Effect of Thermal
Page 5 and 6: References • Applicable standard
Page 7 and 8: Types of Thermal Bridges 3. Systema
Page 9 and 10: Theoretical Overview • One dimens
Page 11 and 12: Q One dimensional heat transfer Fou
Page 13 and 14: Standard Surface resistances Direct
Page 15 and 16: When is three dimensional analysis
Page 17 and 18: Linear thermal transmittance (ψ or
Page 19 and 20: H H TB TB = ΣLψ = yΣ SAP calcula
Page 21 and 22: SAP calculations example H H TB TB
Page 23 and 24: SBEM calculations example Scottish
Page 25 and 26: 2D heat transfer software THERM Fre
Page 27 and 28: THERM 2 Solution Procedure A PC pro
Page 29: Worked Example Eaves detail (BRE 49
Page 33 and 34: Working with THERM Open BRE Validat
Page 35 and 36: Important notes A THERM model conta
Page 37 and 38: Technical Parameters Select Options
Page 39 and 40: Isotherms Scottish Energy Systems G
Page 41 and 42: Temperature Scottish Energy Systems
Page 43 and 44: Calculation of f value f min = T in
Page 45 and 46: Materials library Select Libraries
Page 47 and 48: Boundary Condition library Select L
Page 49 and 50: Inputting geometry Set snap on: Opt
Page 51 and 52: Model Attribution (BC) 1. Click on
Page 53 and 54: 4. Rerun simulation 5. Press the U
Page 55 and 56: PassivHaus construction example AWm
Page 57 and 58: Construction DAm02 DAm02: 1. PE sea
Page 59 and 60: U factors Define these two surfaces
Page 61 and 62: Miscellaneous notes It is possible
Page 63 and 64: Worksheet • Q4. What are the dime

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