Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Building Pressurization in Extreme Cold Climates
Building pressurization, the differential pressure between the interior of a building and its exterior surroundings, is an important design consideration. Pressurization is the driving force in building infiltration/exfiltration. It also affects air flow within building zones. Improper calculation of pressurization can result in undersizing the building's heating and cooling systems, improper operation of air distribution systems, improper operation of elevators, and freezing and failure of water distribution and circulation systems. Building pressurization is affected by several environmental and design considerations. Primary environmental influences are: wind speed/direction and exterior-to-interior temperature difference. Pressurization due to these two parameters is generally referred to as wind effect and buoyancy or stack effect respectively. In extreme cold climates, the predominant effect is of the buoyancy type. This effect is caused by the temperature, and thus air density, differences between the interior of the building and its exterior surroundings. The larger the temperature difference, the larger the buoyancy effect. In extreme cold climates, large temperature differences often occur at times when wind speed is negligible. Also of critical importance is that while wind effect is transitory, lasting from minutes to hours; extreme temperature differences can be persistent, lasting days, weeks, or longer. The American Society of Heating, Refrigeration, and Air Conditioning Engineers (ASHRAE) presents an idealized equation to calculate the buoyancy effect. This paper compares differential pressure measurements from an actual building to this idealized model. It also presents several new statistical models based on the collected data. These new models should provide engineers with improved tools to properly account for building pressurization for designs in extreme cold climates.
Building Pressurization in Extreme Cold Climates
Building pressurization, the differential pressure between the interior of a building and its exterior surroundings, is an important design consideration. Pressurization is the driving force in building infiltration/exfiltration. It also affects air flow within building zones. Improper calculation of pressurization can result in undersizing the building's heating and cooling systems, improper operation of air distribution systems, improper operation of elevators, and freezing and failure of water distribution and circulation systems. Building pressurization is affected by several environmental and design considerations. Primary environmental influences are: wind speed/direction and exterior-to-interior temperature difference. Pressurization due to these two parameters is generally referred to as wind effect and buoyancy or stack effect respectively. In extreme cold climates, the predominant effect is of the buoyancy type. This effect is caused by the temperature, and thus air density, differences between the interior of the building and its exterior surroundings. The larger the temperature difference, the larger the buoyancy effect. In extreme cold climates, large temperature differences often occur at times when wind speed is negligible. Also of critical importance is that while wind effect is transitory, lasting from minutes to hours; extreme temperature differences can be persistent, lasting days, weeks, or longer. The American Society of Heating, Refrigeration, and Air Conditioning Engineers (ASHRAE) presents an idealized equation to calculate the buoyancy effect. This paper compares differential pressure measurements from an actual building to this idealized model. It also presents several new statistical models based on the collected data. These new models should provide engineers with improved tools to properly account for building pressurization for designs in extreme cold climates.
Building Pressurization in Extreme Cold Climates
Bargar, H. Ed (Autor:in) / Das, Debendra K. (Autor:in)
11th International Conference on Cold Regions Engineering ; 2002 ; Anchorage, Alaska, United States
Cold Regions Engineering ; 519-530
08.05.2002
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Building Pressurization in Extreme Cold Climates
| British Library Conference Proceedings | 2002
| BASE | 2022
Field measurements of hygrothermal performance of attics in extreme cold climates
| British Library Online Contents | 2018
Field measurements of hygrothermal performance of attics in extreme cold climates
| British Library Online Contents | 2018
Field measurements of hygrothermal performance of attics in extreme cold climates
| British Library Online Contents | 2018