Modeling of air convection effects on hygrothermal performance of vented roofs

John Grunewald, Andreas Nicolai, Jianshun Zhang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Hygrothermal models for numerical simulation of heat and moisture transfer in building envelopes are already well developed and available to the scientific community. Building upon existing codes, the inclusion of air convection is an essential step towards realistic simulation of air permeable materials. Modeling the airflow effects on hygrothermal performance of vented roofs and lightweight wall assemblies is of particular practical relevance. Key element for an efficient numerical solution is the method of coupling of the balance equations for heat, air and moisture. Various numerical solution techniques exist for coupled non-linear systems of differential equations and have been successfully employed for solving two-dimensional coupled heat and moisture transport problems. However, finding an efficient solution scheme with acceptable accuracy for three-dimensional problems, including airflow effects, remains a challenge. The paper presents the governing equations and assumptions of a newly developed model for Coupled Heat, Air Moisture and Pollutant Simulation (CHAMPS). An approach for considering three-dimensional airflow effects is introduced. The capabilities of the numerical model are demonstrated by application to a vented roof construction widely used in moderate climate zones.

Original languageEnglish (US)
Title of host publicationBuildings X
Subtitle of host publicationThermal Performance of Exterior Envelopes of Whole Buildings
PublisherAmerican Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE)
ISBN (Electronic)9781933742281
StatePublished - 2007
Event10th International Conference on Thermal Performance of Exterior Envelopes of Whole Buildings 2007 - Clearwater, United States
Duration: Jan 1 2007Jan 1 2007

Publication series

NameThermal Performance of the Exterior Envelopes of Whole Buildings
ISSN (Electronic)2166-8469

Conference

Conference10th International Conference on Thermal Performance of Exterior Envelopes of Whole Buildings 2007
CountryUnited States
CityClearwater
Period1/1/071/1/07

ASJC Scopus subject areas

  • Civil and Structural Engineering

Fingerprint Dive into the research topics of 'Modeling of air convection effects on hygrothermal performance of vented roofs'. Together they form a unique fingerprint.

Cite this