A Diversity of thermal comfort levels and behavioral adaptations of occupants in naturally ventilated houses in different climatic zones of Sri Lanka

Abstract

The study highlights a scenario in respect to a range of neutral temperatures specific to naturally ventilated residential buildings in climatic zones of Sri Lanka and occupants' behavioural adaptations such as clothing, window opening and use of mechanical ventilation. A field study was conducted during April – May in three different climatic zones of Sri Lanka. A total number of 90 data sets were obtained from all zones. Transverse type questionnaires were used to collect the sensations and preferences of subjects on ASHRAE seven- point and five-point scales related to temperature, relative humidity and air velocity. Griffith’s method was used to determine the neutral temperature. Griffith’s comfort temperature for all zones was found as 27.23 °C. Controlling air velocity was found more preferable as a thermal adaptive opportunity over adjusting clothing and opening windows and doors.