Dynamic analysis of moisture transport through walls and associated cooling loads in the hot/humid climate of Florianopolis, Brazil
- Lawrence Berkeley Lab., CA (United States). Energy and Environment Div.
- Federal Univ. of Santa Catarina, Florianopolis, Santa Catarina (Brazil). Mechanical Engineering Dept.
The authors describe the use of a dynamic model of combined heat and mass transfer to analyze the effects on cooling loads of transient moisture storage and transport through walls with porous building materials, under varying boundary conditions. The materials studied were brick, lime mortar and autoclaved cellular concrete. The physical properties of these materials, such as mass transport coefficients, thermal conductivity and specific heat, were taken to be functions of moisture content. The simulation results were compared to those obtained by pure conduction heat transfer without moisture effects. Also analyzed were the influence on cooling loads of high moisture content due to rain soaking of materials, and the influence of solar radiation on sunny and cloudy days. The weather used was a hot/humid summer period in Florianopolis (South Brazil). It is shown that neglecting moisture migration or assuming that the physical properties of wall materials do not depend on moisture content can result in large errors in sensible and latent heat transfer.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 251327
- Report Number(s):
- LBL-38505; CONF-9605190-1; ON: DE96011522; TRN: AHC29614%%55
- Resource Relation:
- Conference: 10. symposium on improving building climates in hot and humid climates, Fort Worth, TX (United States), 13-14 May 1996; Other Information: PBD: Apr 1996
- Country of Publication:
- United States
- Language:
- English
Similar Records
Moisture: Its effects on the thermal performance of a low-slope roof system
Condensation process in external concrete walls under random fluctuation of outdoor temperature -- Fundamental study on heat and moisture behavior by Fokker-Planck equation