Numerical study on the influence of a ceiling height for displacement ventilation

This study analyses vertical temperature profiles for displacement ventilation depending on a ceiling height of an small office room. This study purposes to investigate the influence of the ceiling height on thermal comfort of the occupants. Numerical simulations are carried out for a modeled room which dimensions 5.3m by 5.44m by 2.5m, 3m and 3.5m ceiling height. A finite volume method is used for solving the governing equations and low Reynolds number k-ε model is applied as a turbulent model. A heat source is installed at the centre of the modeled room and lighting load is given on the ceiling. The surface temperature of the ceiling-mounted lighting fixtures is given as a boundary condition by measuring surface temperature of fluorescent lamps using a thermograph. Normalised vertical temperature profiles are compared for each ceiling height room. Numerical results are compared to experimental results for 2.5m ceiling height room. As a result, thermal comfort is surveyed for different ceiling height rooms for displacement ventilation.