Abstract
The aim of the study is to present an analytical model to predict the temperature profiles in thermal stratified environment. Thermal stratification is encountered in many situations. The flow of contaminants and hydrocarbons in environment often get stratified. The prediction of temperature profiles and flow characteristics are essential for HVAC applications, environment and energy management. The temperature profiles in the stratified region are successfully obtained, in terms of flow-operating functions. The analytical model agrees well with the published experimental data as well as the related closed-form solutions, which is helpful for HVAC applications. The model will be further developed and incorporated within a numerical model in order to investigate the flow field characteristics and establish correlations for a wide range of parameters.
Highlights
The phenomenon of stratification is encountered in environmental applications
Thermal stratification is so important for efficient ventilation, which affected by the flow functions and the heat transfer parameters that can be improved by controlling of these functions in order to refresh the selective environment where the extracted heat or pollutant concentration is highest (Hahne and Chen, 1998; Calay et al, 2000)
It depends on the geometry of the sources and the openings rather than the source strength, while the degree of stratification depends on the source strength
Summary
In a fully insulated environment, smoke and toxic pollutants often get stratified in layers (Awad et al, 2008). In a fully insulated environment, smoke and toxic pollutants often get stratified in layers. These layers may cause an explosion source or fire hazards. Pollutants concentrations could be locked in the space at different levels (layers of pollutants) The distribution of these layers is very sensitive to disturbances; that can cause a great decrease in the local ventilation effectiveness (Mundt, 1994). Using small scale model, Linden et al (1990) found that the stratification characteristics within a confined space depend on the entrainment produced by buoyancy sources. They found that the location of the stratification interface level height is a function of the geometrical parameters and independent of the strength of buoyancy source
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