Draught Risk from Cold Vertical Surfaces

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Resumé

Glazed facades and atria have had a boom in the 1980's as an architectural feature in building design. Natural convective flows from these cold surfaces are in winter time, however, often the cause of thermal discomfort and there is a need for research to improve the design methods.
The objective of the research is to develop expressions for the airflow beyond the floor area, which influences the thermal comfort in the occupied zone. Measurements of velocities and temperatures are carried out in a two-dimensional test case.
They show that the characteristics of the flow in the near floor region are very similar to the characteristics of stratified flows. Expressions have been developed for the rate of decrement of the maximum velocity with distance from the surface and for the maximum temperature difference between the cold airflow along the floor and the rest of the occupied zone.
OriginalsprogEngelsk
Udgivelses stedAalborg
ForlagDept. of Building Technology and Structural Engineering
Antal sider6
StatusUdgivet - 1993
NavnIndoor Environmental Technology
Nummer35
Vol/bindR9338
ISSN0902-7513

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airflow
stratified flow
architectural design
design method
temperature
winter
cold
need
test
rate

Bibliografisk note

Presented at Indoor Air '93 The 6th International Conference on Indoor Air Quality and Climate, Helsinki, Finland, July 1993

PDF for print: 12 pp.

Emneord

  • Aircondition
  • Draught Risk

Citer dette

Heiselberg, P. (1993). Draught Risk from Cold Vertical Surfaces. Aalborg: Dept. of Building Technology and Structural Engineering. Indoor Environmental Technology, Nr. 35, Bind. R9338
Heiselberg, Per. / Draught Risk from Cold Vertical Surfaces. Aalborg : Dept. of Building Technology and Structural Engineering, 1993. 6 s. (Indoor Environmental Technology; Nr. 35, Bind R9338).
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abstract = "Glazed facades and atria have had a boom in the 1980's as an architectural feature in building design. Natural convective flows from these cold surfaces are in winter time, however, often the cause of thermal discomfort and there is a need for research to improve the design methods.The objective of the research is to develop expressions for the airflow beyond the floor area, which influences the thermal comfort in the occupied zone. Measurements of velocities and temperatures are carried out in a two-dimensional test case.They show that the characteristics of the flow in the near floor region are very similar to the characteristics of stratified flows. Expressions have been developed for the rate of decrement of the maximum velocity with distance from the surface and for the maximum temperature difference between the cold airflow along the floor and the rest of the occupied zone.",
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Heiselberg, P 1993, Draught Risk from Cold Vertical Surfaces. Indoor Environmental Technology, nr. 35, bind R9338, Dept. of Building Technology and Structural Engineering, Aalborg.

Draught Risk from Cold Vertical Surfaces. / Heiselberg, Per.

Aalborg : Dept. of Building Technology and Structural Engineering, 1993. 6 s. (Indoor Environmental Technology; Nr. 35, Bind R9338).

Publikation: Bog/antologi/afhandling/rapportRapportForskningpeer review

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PY - 1993

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N2 - Glazed facades and atria have had a boom in the 1980's as an architectural feature in building design. Natural convective flows from these cold surfaces are in winter time, however, often the cause of thermal discomfort and there is a need for research to improve the design methods.The objective of the research is to develop expressions for the airflow beyond the floor area, which influences the thermal comfort in the occupied zone. Measurements of velocities and temperatures are carried out in a two-dimensional test case.They show that the characteristics of the flow in the near floor region are very similar to the characteristics of stratified flows. Expressions have been developed for the rate of decrement of the maximum velocity with distance from the surface and for the maximum temperature difference between the cold airflow along the floor and the rest of the occupied zone.

AB - Glazed facades and atria have had a boom in the 1980's as an architectural feature in building design. Natural convective flows from these cold surfaces are in winter time, however, often the cause of thermal discomfort and there is a need for research to improve the design methods.The objective of the research is to develop expressions for the airflow beyond the floor area, which influences the thermal comfort in the occupied zone. Measurements of velocities and temperatures are carried out in a two-dimensional test case.They show that the characteristics of the flow in the near floor region are very similar to the characteristics of stratified flows. Expressions have been developed for the rate of decrement of the maximum velocity with distance from the surface and for the maximum temperature difference between the cold airflow along the floor and the rest of the occupied zone.

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Heiselberg P. Draught Risk from Cold Vertical Surfaces. Aalborg: Dept. of Building Technology and Structural Engineering, 1993. 6 s. (Indoor Environmental Technology; Nr. 35, Bind R9338).