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

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Agenda • 0930 Thermal bridging • 1000 Theoretical background • 1100 Morning coffee • 1115 Regulatory requirements • 1230 Lunch • 1330 Introduction to THERM 2 • 1400 Workshop exercise 1 • 1500 Afternoon coffee • 1515 Workshop exercise 2 • 1630 Exercise feedback and wrap up • 1700 Close Scottish Energy Systems Group samuel@esru.strath.ac.uk
Thermal Bridging Effect of Thermal Bridging on U value for a timber frame wall A thermal bridge (timber is created thickness/insulation when due thickness) to structural or geometrical interruptions to homogenous insulated 0.75 construction 0.7 elements a path is created that allows heat 0.65 flow in addition to the one dimensional heat loss through 0.6 the construction 0.55 elements 89/25 0.5 89/50 Disadvantage: 0.45 89/89 Greater 0.4 heat loss through fabric 119/119 0.35 140/140 Localised cold spots on fabric elements 0.3 0.25 Lower radiant temperature (lower thermal comfort) 0.2 0.15 Condensation risk (mould hazard, maintenance) 0 5 10 15 20 Importance: Proportion of heat loss through bridge Percentage of wall bridged increases as U values decrease U value Scottish Energy Systems Group samuel@esru.strath.ac.uk
Page 1: Scottish Energy Systems Group ... e
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 and 30: Worked Example Eaves detail (BRE 49
Page 31 and 32: BRE 497 Roof junction boundary cond
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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Analysis of Thermal Bridges - Scottish Energy Systems Group ...

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