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Integrated methodology for evaluation of energy performance of the building enclosures: part 3 ¡ª uncertainty in thermal measurem

Thorsell, T. and Bomberg, M.
2011
Journal of Building Physics July 2011 35: 83-96,

Thorsell, T. and Bomberg, M., (2011), "Integrated methodology for evaluation of energy performance of the building enclosures: part 3 ¡ª uncertainty in thermal measurem", Journal of Building Physics July 2011 35: 83-96,.
Abstract:
Thermal performance of building enclosure is typically based on laboratory tests performed on dry materials without consideration of air and moisture movement through the assembly. To address the field performance of the assembly, however, one must combine measurements and hygrothermal modeling. Hygrothermal models are necessary to include effects of climate and in particular the effects of moisture movement on thermal performance. Full-scale testing is necessary to relate findings of the models to actual construction details. The first paper in this series (Bomberg and Thorsell, 2008) introduced a test program that starting with benchmarking of the R-value of the tested wall in standard conditions, examined the effects of air flow on its thermal performance. This test program does not use the average R-values of the wall as it is in the ASTM testing, but measures local thermal resistance in selected places and calculates the average R-values. The second paper in this series (Thorsell and Bomberg, 2008) applied this integrated testing and modeling approach to selected wood framed residential walls, identifying the magnitude of air flow effects on steady-state thermal resistance, as well as demonstrating that the thermal performance of the top of the wall differs from that at the bottom. It also showed a systematic and time dependent shift in thermal performance caused by moisture movement. In this, third paper in the series, we present measurements performed on metal frame walls that introduce additional sources of uncertainty in the experimental results. We end with a discussion on the need of improvements to testing procedures for evaluation of energy performance of building enclosures.

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Author Information and Other Publications Notes
Thorsell, T.
  1. Integrated Methodology for Evaluation of Energy Performance of the Building Enclosures -- Part 1: Test Program Development  
Bomberg, M.
  1. Analysis of selected water absorption coefficient measurements
  2. Building envelope and environmental control - Part 3: Issues of system integration
  3. Building envelope and environmental control: issues of system integration
  4. Building envelope design, Part 2: estimating field performance of thermal insulation
  5. Building envelope: Heat, air and moisture interactions
  6. Final Report from Task 8 of MEWS Project (T8-03) - Hygrothermal Response of Exterior Wall Systems to Climate Loading: Methodology and Interpretation of Results for Stucco, EIFS, Masonry and Siding Clad Wood-Frame Walls
  7. Heat, air and moisture control in walls of Canadian houses: a review of the historic basis for current practices
  8. In-Situ performance evaluation of exterior insulation basement systems (EIBS) - spray polyurethane foam: summary report
  9. Integrated Methodology for Evaluation of Energy Performance of the Building Enclosures -- Part 1: Test Program Development
  10. Modified cup for testing of water vapour transmission through thick, permeable materials
  11. Moisture management of EIFS walls. Part 1.The basis for evaluation
  12. Performance evaluation of exterior insulation and finish systems (EIFS)
  13. Position paper on material characterization and HAM model benchmarking
  14. Report from Task 2 of MEWS Project - Description of 17 Large Sale Wall Specimens Built for Water Entry Investigation in IRC Dynamic Wall Testing Facility
  15. Report from Task 8 of MEWS Project - MEWS Methodology for Developing Moisture Management Strategies - Application to Stucco Clad Wood-Frame Walls in North America
  16. The energy conundrum of modern buildings
  17. Three-dimensional analysis of thermal resistance of exterior basement insulation systems (EIBS)
  18. Towards an engineering model of material characteristics for input to ham transport simulations - Part 1: an approach
  19. Water vapor transmission and moisture accumulation in polyurethane and polyisocyanurate foams
  20. Water vapor transmission through building materials and system: mechanisms and measurement  


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