A study on the characteristics of indoor environment and comfort in office building with underfloor air-conditioning (UFAC) system.

During the last decade, an increasing interest in Underfloor Air-Conditioning (UFAC) systems has emerged. This is due mainly to an increased demand from employees for a greater control over their working environment. And the building and its engineering systems not only have to be designed to achieve the high standards of environmental control at economical cost, but also thermal comfort is an important factor that influences occupants' satisfaction with the indoor office environment. The purpose of the study is to evaluate comprehensively the environmental performance of office buildings with UFAC system in order to suggest the basic data for developing the design prototype of this system within the possible range. Physical measurements were made of thermal environmental factors, the equivalent sound level of room, the levels of illumination of working plane, and indoor air quality.