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Modeling two and three-dimensional heat transfer through composite wall and roof assemblies in hourly simulation programs

ASHRAE
2001
ASHRAE Final Report

ASHRAE, (2001), "Modeling two and three-dimensional heat transfer through composite wall and roof assemblies in hourly simulation programs", ASHRAE Final Report.
Abstract:
:

In recent years, there has been a trend towards the use of metal-frame construction in both residential and commercial construction as the relative cost of wood to metal continues to increase. There has also been rapid development of new construction technologies where highly conductive structural materials such as metal or concrete are combined with high-performance insulating materials to produce assemblies with complicated networks of three-dimensional thermal bridges. Meanwhile, the dynamic modeling of even conventional concrete and masonry assemblies continues to be problematic. This situation has greatly increased the need for more accurate modeling of multi-dimensional heat flows in composite walls and roofs in hourly simulations. The objective of this research project is to: 1) Identify common building assemblies in walls and roofs. 2) Develop a library of response factors or equivalent properties representative of these common details, which include transient and multi-dimensional effects. 3) Verify the accuracy of the detailed models and response factors (or equivalent properties) against historical data. 4) Develop clear guidelines on how to use these response factors or properties.

Principal Investigator:Stephen Kemp, Enermodal Engineering Limited

Conducted:Sept. 1999 - April 2001

Sponsored by:TC 4.7, Energy Calculations
Related Resources:
  • This link has not been checked.ANSI-- American National Standards Institute
    "a private, non-profit organization (501(c)3) that administers and coordinates the U.S. voluntary standardization and conformity assessment system. to enhance both the global competitiveness of U.S. business and the U.S. quality of life by promoting and facilitating voluntary consensus standards and conformity assessment systems, and safeguarding their integrity."
  • This link has not been checked.ASHRAE-American Society of Heating, Refrigerating and Air-Conditioning Engineers
    "the sole purpose of advancing the arts and sciences of heating, ventilation, air conditioning and refrigeration for the public's benefit through research, standards writing, continuing education and publications."

Related Concepts

Author Information and Other Publications Notes
ASHRAE
American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc 1791 Tullie Circle, NE ? Atlanta GA 30329
  1. Advanced Energy Design Guides
  2. ANSI/ASHRAE Standard 140-2001, Standard Method of Test for the Evaluation of Building Energy Analysis Computer Programs
  3. ASHRAE 52.2, method of testing general ventilation air-cleaning devices used for removal effciency
  4. ASHRAE Handbook-Fundamentals
  5. BSR/ASHRAE Standard 55-1992R, thermal environmental conditions for human occupancy, first public review draft
  6. Characterization of framing factors for low-rise residential building walls
  7. Moisture transfer in porous materials exposed to combined humidity and temperature gradients
  8. Position documents: indoor air quality
  9. Recommended practices for controlling moisture in crawl spaces
  10. Standard 62.2, Ventilation and Acceptable Indoor Air Quality in Low-Rise Residential Buildings
  11. Standard 62.2P, Ventilation and Acceptable Indoor Air Quality in Low-Rise Residential Buildings
  12. Standard 90.1: Energy efficient design of new buildings except low-rise residential buildings
  13. Standard 90.2, Energy Efficient Design of New Low-Rise Residential Buildings
  14. Thermal environmental conditions for human occupancy, ASHRAE Standard 55-2004
  15. Thermal performance of the exterior envelopes of buildings IV
  16. WYEC2 Software  


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