TY - CONF KW - Indoor environment department KW - Ventilation and air cleaning KW - Commercial Building Ventilation and Indoor Environmental Quality Group KW - Air distribution KW - Measurements KW - Thermal stratification KW - Underfloor KW - Ventilation efficiency AU - William J Fisk AU - David Faulkner AU - Douglas P Sullivan AU - Christopher Y.H Chao AU - Man-Pun Wan AU - Leah Zagreus AU - Thomas L Webster AB -

Underfloor air distribution (UFAD) is a method of supplying conditioned air via floor mounted air supply diffusers. We measured several aspects of the performance of an UFAD system in an office building. The air change effectiveness was very close to unity, which is comparable to that measured in buildings with typical overhead air distribution. The pollutant removal efficiency for carbon dioxide was 13% higher than expected with well-mixed air. The increase in air temperatures with height above the floor was only 1 to 2 °C. This amount of thermal stratification could reduce the sensible energy requirements for cooling of outdoor air by approximately 10%. The occupant's satisfaction with thermal conditions was well above average. Thus, the results of this study provide some evidence of moderate energy and IAQ-related benefits of UFAD; however, the benefits need to be confirmed in other studies.

BT - Proceedings of the 10th International Conference on Indoor Air Quality and Climate - Indoor Air 2005 C1 -

1.5

CY - Beijing, China LA - eng N2 -

Underfloor air distribution (UFAD) is a method of supplying conditioned air via floor mounted air supply diffusers. We measured several aspects of the performance of an UFAD system in an office building. The air change effectiveness was very close to unity, which is comparable to that measured in buildings with typical overhead air distribution. The pollutant removal efficiency for carbon dioxide was 13% higher than expected with well-mixed air. The increase in air temperatures with height above the floor was only 1 to 2 °C. This amount of thermal stratification could reduce the sensible energy requirements for cooling of outdoor air by approximately 10%. The occupant's satisfaction with thermal conditions was well above average. Thus, the results of this study provide some evidence of moderate energy and IAQ-related benefits of UFAD; however, the benefits need to be confirmed in other studies.

PB - Tsinghua University Press PP - Beijing, China PY - 2005 EP - 1016 – 1020 T2 - Proceedings of the 10th International Conference on Indoor Air Quality and Climate - Indoor Air 2005 T3 - 10th International Conference on Indoor Air Quality and Climate - Indoor Air 2005 TI - Results Of A Field Study Of Underfloor Air Distribution VL - 1(7) ER -