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7In an office room, many factors affect the pattern of airflow, thermal comfort, indoor air quality and 8 energy saving. In this study, the effects of the location of exhaust diffusers where the warm and 9 contaminant air is extracted and their relation to room heat sources on thermal comfort and energy 10 saving were investigated numerically for an office served by a displacement ventilation system. The 11 indoor air quality in the breathing level and the inhaled zone were also evaluated. The contaminants 12 were released from window and door frames in order to simulate the contaminants coming from 13 outside. The amount of energy consumption and the indoor thermal environment for various exhaust 14 locations were investigated numerically using the computational fluid dynamics techniques. The 15 results showed that the thermal indoor environment, thermal comfort, quality of indoor air and energy 16 saving were greatly improved by combining the exhaust outlets with some of the room's heat sources 17 such as ceiling lamps and external walls. In particular, a 25.0 % of energy saving was achieved by 18 combining the exhaust diffuser with room's ceiling lamps. In addition, locating the exhaust diffuser 19 near the heat sources also reduced the cooling coil load by 13.8 %. The risk of a large difference in 20 temperature between the head and foot levels, increased particle concentration in the occupied zone, 21 as well as increased energy consumption was also clearly demonstrated when the exhaust and 22 recirculated air outlet (return opening) were combined in one unit in the occupied boundary area that 23 2 is located at 2m away from the occupants. Thus, for the optimum energy saving and better indoor 1 environment, the combination of the indoor heat sources with the exhaust outlet is necessary. 2

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