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Dimensionless correlations of indoor thermal stratification in a non-enclosed large-space building under heating and cooling conditions
https://orcid.org/0000-0001-9824-094X
Abstract Indoor thermal stratification is a prevailing phenomenon in large-space buildings, which poses great pressure on their energy consumption and indoor built environment. This paper revealed the mechanism of indoor thermal stratification in a non-enclosed large-space building under heating and cooling conditions. It can be abstracted as a joint effect of the cold and hot air inflow (i.e., HVAC system and outdoor air infiltration), which are respectively depicted by two newly-defined Archimedes numbers (i.e., Ar c and Ar h). Then, we developed dimensionless correlations between the indoor thermal stratification (quantified by the dimensionless factor of the vertical temperature profile, C T) and the two streams of air inflow (quantified by Ar c and Ar h). For application, the dimensionless correlations can be coupled with our previously proposed theoretical model to accurately predict the air infiltration rate in a large-space building. Moreover, the dimensionless analysis reveals a principle of indoor vertical temperature profile control to minimize the buoyancy driving force of air infiltration in large-space buildings: Achieving a vertically uniform indoor thermal environment under heating condition and an effectively stratified indoor thermal environment under cooling condition. These findings help to provide practical guidelines to minimize buoyancy-driven air infiltration in large-space buildings.
Graphical abstract Display Omitted
Highlights Co-effect of cold & hot air inflow on thermal stratification in non-enclosed building. Define Archimedes numbers (Ar c & Ar h) to depict HVAC system and air infiltration. Dimensionless correlation between thermal stratification and cold & hot air inflow. Couple the correlation with the theoretical model to predict air infiltration rate. Temperature profile control principle to minimize buoyancy-driven air infiltration.
Dimensionless correlations of indoor thermal stratification in a non-enclosed large-space building under heating and cooling conditions
https://orcid.org/0000-0001-9824-094X
Abstract Indoor thermal stratification is a prevailing phenomenon in large-space buildings, which poses great pressure on their energy consumption and indoor built environment. This paper revealed the mechanism of indoor thermal stratification in a non-enclosed large-space building under heating and cooling conditions. It can be abstracted as a joint effect of the cold and hot air inflow (i.e., HVAC system and outdoor air infiltration), which are respectively depicted by two newly-defined Archimedes numbers (i.e., Ar c and Ar h). Then, we developed dimensionless correlations between the indoor thermal stratification (quantified by the dimensionless factor of the vertical temperature profile, C T) and the two streams of air inflow (quantified by Ar c and Ar h). For application, the dimensionless correlations can be coupled with our previously proposed theoretical model to accurately predict the air infiltration rate in a large-space building. Moreover, the dimensionless analysis reveals a principle of indoor vertical temperature profile control to minimize the buoyancy driving force of air infiltration in large-space buildings: Achieving a vertically uniform indoor thermal environment under heating condition and an effectively stratified indoor thermal environment under cooling condition. These findings help to provide practical guidelines to minimize buoyancy-driven air infiltration in large-space buildings.
Graphical abstract Display Omitted
Highlights Co-effect of cold & hot air inflow on thermal stratification in non-enclosed building. Define Archimedes numbers (Ar c & Ar h) to depict HVAC system and air infiltration. Dimensionless correlation between thermal stratification and cold & hot air inflow. Couple the correlation with the theoretical model to predict air infiltration rate. Temperature profile control principle to minimize buoyancy-driven air infiltration.
Dimensionless correlations of indoor thermal stratification in a non-enclosed large-space building under heating and cooling conditions
https://orcid.org/0000-0001-9824-094X
Abstract Indoor thermal stratification is a prevailing phenomenon in large-space buildings, which poses great pressure on their energy consumption and indoor built environment. This paper revealed the mechanism of indoor thermal stratification in a non-enclosed large-space building under heating and cooling conditions. It can be abstracted as a joint effect of the cold and hot air inflow (i.e., HVAC system and outdoor air infiltration), which are respectively depicted by two newly-defined Archimedes numbers (i.e., Ar c and Ar h). Then, we developed dimensionless correlations between the indoor thermal stratification (quantified by the dimensionless factor of the vertical temperature profile, C T) and the two streams of air inflow (quantified by Ar c and Ar h). For application, the dimensionless correlations can be coupled with our previously proposed theoretical model to accurately predict the air infiltration rate in a large-space building. Moreover, the dimensionless analysis reveals a principle of indoor vertical temperature profile control to minimize the buoyancy driving force of air infiltration in large-space buildings: Achieving a vertically uniform indoor thermal environment under heating condition and an effectively stratified indoor thermal environment under cooling condition. These findings help to provide practical guidelines to minimize buoyancy-driven air infiltration in large-space buildings.
Graphical abstract Display Omitted
Highlights Co-effect of cold & hot air inflow on thermal stratification in non-enclosed building. Define Archimedes numbers (Ar c & Ar h) to depict HVAC system and air infiltration. Dimensionless correlation between thermal stratification and cold & hot air inflow. Couple the correlation with the theoretical model to predict air infiltration rate. Temperature profile control principle to minimize buoyancy-driven air infiltration.
Dimensionless correlations of indoor thermal stratification in a non-enclosed large-space building under heating and cooling conditions
Liu, Xiaochen (author) / Liu, Xiaohua (author) / Zhang, Tao (author)
Building and Environment ; 254
2024-03-04
Article (Journal)
Electronic Resource
English
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