Abstract
The objectives of air distribution systems for warm air heating, ventilating, and air-conditioning are to create the proper thermal environment conditions in the occupied zone (combination of temperature, humidity, and air movement), and to control vapor and air born particle concentration within the target levels set by the process requirements and/or threshold limit values based on health effects, fire and explosion prevention, or other considerations. HVAC systems designs are constrained by existing codes, standards, and guidelines, which specify some minimum requirements for the HVAC system elements, occupant`s and process environmental quality and safety. There is a variety of different methods consulting engineers use to design room air diffusion and to select and size air diffusers, such as assumption of perfect mixing, design methods employing the empirical relations determined through research, such as the air diffusion performance index (ADPI), air jet theory and computational fluid dynamics (CFD) codes. Air supplied into the room through the various types of outlets (grills, ceiling mounted air diffusers, perforated panels etc.), is distributed by turbulent air jets. In mixing type air distribution systems, these air jets are the primary factor affecting room air motion. Numerous theoretical and experimental studies that developed a solid base for
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Citation Formats
Hagstroem, K, Siren, K, and Zhivov, A M.
Calculation methods for air supply design in industrial facilities. Literature review.
Finland: N. p.,
1999.
Web.
Hagstroem, K, Siren, K, & Zhivov, A M.
Calculation methods for air supply design in industrial facilities. Literature review.
Finland.
Hagstroem, K, Siren, K, and Zhivov, A M.
1999.
"Calculation methods for air supply design in industrial facilities. Literature review."
Finland.
@misc{etde_10147829,
title = {Calculation methods for air supply design in industrial facilities. Literature review}
author = {Hagstroem, K, Siren, K, and Zhivov, A M}
abstractNote = {The objectives of air distribution systems for warm air heating, ventilating, and air-conditioning are to create the proper thermal environment conditions in the occupied zone (combination of temperature, humidity, and air movement), and to control vapor and air born particle concentration within the target levels set by the process requirements and/or threshold limit values based on health effects, fire and explosion prevention, or other considerations. HVAC systems designs are constrained by existing codes, standards, and guidelines, which specify some minimum requirements for the HVAC system elements, occupant`s and process environmental quality and safety. There is a variety of different methods consulting engineers use to design room air diffusion and to select and size air diffusers, such as assumption of perfect mixing, design methods employing the empirical relations determined through research, such as the air diffusion performance index (ADPI), air jet theory and computational fluid dynamics (CFD) codes. Air supplied into the room through the various types of outlets (grills, ceiling mounted air diffusers, perforated panels etc.), is distributed by turbulent air jets. In mixing type air distribution systems, these air jets are the primary factor affecting room air motion. Numerous theoretical and experimental studies that developed a solid base for turbulent air jets theory were conducted concurrently in different countries (Germany, Sweden, Russia, U.K., USA) from the 1930`s through the 1980`s. Design methods based on air jet theory allows for the prediction of extreme values of air velocities and air temperatures in the occupied zone of empty spaces. Current air jet theory techniques account for the effects of buoyancy, confinement, jets interaction. For many conditions of jet discharge, it is possible to analyze jet performance and determine: the angle of divergence of the jet boundary; the velocity patterns along heated or chilled the jet axis; the velocity and temperature profile at any cross section in the zone of maximum engineering importance; the entrainment ratios in the same zone; the jet trajectory; the vertically projected or inclined air jet throw; the separation point of the jet from the surface; influence of confinement on jet behavior; the multiple jet interaction. The results of most analytical and experimental studies has been received in empty rooms and do not reflect the influence of the obstructions on the air distribution and ventilation efficiency. Information on the influence of obstructions on room air distribution is limited. Attempts has been made to utilize statistical data from the occupied zone conditions in order to extend predictions from extreme parameters to the rest of the occupied zone. The efficiency of the ventilation can be analyzed using zonal models. (orig.) 380 refs.}
place = {Finland}
year = {1999}
month = {Sep}
}
title = {Calculation methods for air supply design in industrial facilities. Literature review}
author = {Hagstroem, K, Siren, K, and Zhivov, A M}
abstractNote = {The objectives of air distribution systems for warm air heating, ventilating, and air-conditioning are to create the proper thermal environment conditions in the occupied zone (combination of temperature, humidity, and air movement), and to control vapor and air born particle concentration within the target levels set by the process requirements and/or threshold limit values based on health effects, fire and explosion prevention, or other considerations. HVAC systems designs are constrained by existing codes, standards, and guidelines, which specify some minimum requirements for the HVAC system elements, occupant`s and process environmental quality and safety. There is a variety of different methods consulting engineers use to design room air diffusion and to select and size air diffusers, such as assumption of perfect mixing, design methods employing the empirical relations determined through research, such as the air diffusion performance index (ADPI), air jet theory and computational fluid dynamics (CFD) codes. Air supplied into the room through the various types of outlets (grills, ceiling mounted air diffusers, perforated panels etc.), is distributed by turbulent air jets. In mixing type air distribution systems, these air jets are the primary factor affecting room air motion. Numerous theoretical and experimental studies that developed a solid base for turbulent air jets theory were conducted concurrently in different countries (Germany, Sweden, Russia, U.K., USA) from the 1930`s through the 1980`s. Design methods based on air jet theory allows for the prediction of extreme values of air velocities and air temperatures in the occupied zone of empty spaces. Current air jet theory techniques account for the effects of buoyancy, confinement, jets interaction. For many conditions of jet discharge, it is possible to analyze jet performance and determine: the angle of divergence of the jet boundary; the velocity patterns along heated or chilled the jet axis; the velocity and temperature profile at any cross section in the zone of maximum engineering importance; the entrainment ratios in the same zone; the jet trajectory; the vertically projected or inclined air jet throw; the separation point of the jet from the surface; influence of confinement on jet behavior; the multiple jet interaction. The results of most analytical and experimental studies has been received in empty rooms and do not reflect the influence of the obstructions on the air distribution and ventilation efficiency. Information on the influence of obstructions on room air distribution is limited. Attempts has been made to utilize statistical data from the occupied zone conditions in order to extend predictions from extreme parameters to the rest of the occupied zone. The efficiency of the ventilation can be analyzed using zonal models. (orig.) 380 refs.}
place = {Finland}
year = {1999}
month = {Sep}
}