Investigation on the flow and thermal behavior of impinging jet ventilation systems in an office with different heat loads

► v2¯−f model shows better performance than RNG and SST k-ω for the type of impinging jet flow. ► The interaction effect of chilled ceiling and heat sources results in air circulation(s) in a room. ► The appearance and strength of the air circulation mainly depends on the external heat load on window and number of occupants. ► The effects of air circulation consequently alter the temperature field and the level of local thermal comfort.