Royal Palace (Yauanfu) is suited at the Liangshui River in the second ring of Southwest Beijing. Jointly developed by three developers, including Shimao Group Holdings Limited, Beijing Guorui Xinghui Real Estate Development Co., Ltd and China Jinmao Holdings Group Limited, Yauanfu is one of the luxury real estates in Mainland China. Yauanfu is using Underfloor Air Distribution system (i.e. using an underfloor supply plenum located between the structural concrete slab and a raised floor system to supply conditioned air to supply outlets (usually floor diffusers), located at or near floor level within the occupied space. Air returns from the room at ceiling level or the maximum allowable height above the occupied zone.

In traditional overhead air distribution systems, ductwork, diffusers, grilles, and HVAC infrastructure are positioned and routed above a suspended ceiling. Conditioned air enters the space from supply ducts/diffusers and exits via return air plenums positioned in the ceiling.

With underfloor air distribution, ductwork, diffusers, grilles, and HVAC infrastructure are routed through the plenum space below a raised access floor. Conditioned air is introduced via diffusers at floor level and rises to be collected by return grilles at ceiling level.

Overhead Air Distribution：The air is supplied from the top, mixes with the indoor dirty air, part of the fresh air is diluted and then circulates in the room, and part of the air is directly pumped outdoors through the fresh air handling unit;

Underfloor Air Distribution：The air is supplied from the floor, fresh air slowly rises, and then the top pumps the dirty air to the outside through the fresh air handling unit.

Most of our indoor activities are sitting, generally we are breathing fresh air in the height level of 1.3 meters, with the conventional air distribution, fresh air is sent down from the top, which is difficult to reach our respiratory tract, but via underfloor air distribution, it is easy to get 100% fresh air by replacing indoor air.

In order to improve indoor air quality and protect the health of their families from viral and bacterial infections, the owners of Royal Palace (Yauanfu) deployed Monitair’s indoor bipolar ionization devices in their homes to remove pollutants in the air. 

SOLUTION & RESULT

IA1600 was installed in fresh air unit HVAC with air volume of 500 cmh and 800 cmh respectively. In the underground air distribution setting (displacement type with bottom air supply and upper return air), the distance for ions in the pipeline exceeds 20 meters. After installation, ions increased from 200 ions/cm3 to 7,000 ions/cm3 within 15 minutes, PM2.5 and TVOC was reduced, hence removing bad smell and odor. Ultimately, improving living standard of occupants.

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