IAQ and Energy Performance of the newly developed Single Coil Twin Fan air-conditioning and air distribution system - Results of a Field Trial -

The Single Coil Twin Fan (SCTF) system is a newly developed air-conditioning and air distribution system that aims to deliver enhanced IAQ as well as save energy. The fundamental principle of this system is based on demand ventilation and demand cooling, which is achieved in the individual occupied zones through localized temperature and carbon dioxide sensors positioned in the respective return grilles. The conditioning of the two air streams is achieved by a single compartmented cooling coil, which provides ease of control of the chilled water flow through the coil. Following a successful pilot study on a small-scale laboratory project in 2003 with an estimated energy saving potential of around 12%, a field trial of the SCTF system was embarked upon that involved an office floor area of about 2500 m2 in a newly constructed office building within the campus of National University of Singapore. This paper presents the IAQ and energy data in this office area served by the SCTF system.