Indoor air quality and thermal comfort studies of an under-floor air conditioning system in the...


States thermal comfort parameters were measured at predetermined grid points within an imaginary plane to predict the airflow pattern of the supply air jet and to determine the occurrence of thermal stratification in the office space. Fanger's thermal comfort index was also computed to determine the occupants' thermal sensation. Concentrations of levels of dust and CO2 were also measured to examine the indoor air quality. Statistical methods were applied to derive the relationship between air velocity and the parameters investigated. States the main findings are a reasonable IAQ associated with the underfloor system. However, states occupants are likely to experience localised thermal discomfort near the supply diffusers due to the existence of large temperature gradients. In addition, a stagnant zone was discovered at sedentary level, caused by the parabolic airflow nature of the primary air jet.

Primary Author(s): Sekhar S C, Ching C S

Source: Energy Bldgs., June 2002, vol.34, no.5, 431-444, 11 figs, 4 tabs, 28 refs.

             BSRIA Abstract Doc 000103587 Abs 20020621

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