STUDY OF ONE DIMENSIONAL HEAT AND MASS TRANSFER FOR BUILDING FAÇADE IN HOT AND DRY CLIMATE

Abstract

The Building envelope is a fence that controls heat exchange between in and outer and plays an important role in providing thermal comfort conditions of residents. No need prove that the present climate changes are directly linked to the human activities and also the concerns regarding exploitation of the fossil fuel have reached a level where the negative effect are having impact on the human life cycle of a common man. In recent years, due to the necessity of saving energy and also preventing environmental pollution, the need of sustainable construction has been doubled. Checking the problems of thermal behavior of the building envelope materials, and what influences in the heating and cooling loads ex-erted and energy consumption of buildings, are the questions that this research seeks to answer.[1] It is concluded that with the application of these techniques the building could be made comfortable with comparatively less use of energy for all.

The trend toward increased building wall insulation to conserve energy enhances the tendency for air moisture to condense within the wall. Efforts to predict the types of building wall construction and climatic variations that could cause such wall condensation have not been generally successful when compared to field measurements. Many predictive models rely on steady-state equations for calculating the diffusion rates for heat and water vapor through the building wall structure, ignoring the transient effects and the
storage capacity of the building wall materials. [5] Others include transient effects, but they neglect the distributions of temperature in favor of a lumped parameter approach. Based on conjecture that storage effects may account for the discrepancy between simulation and practice, this paper examines the heat and mass transfer in Building wall materials by utilizing governing equations based on conservation of energy.