Air distribution and draught rate analysis for chilled beam cooling system

The computer model of a chilled beam system considers air and temperature distribution affected by the heat load due to occupancy, lighting, and office equipment. Seven cases were modelled and the results show that induction ratio of 3 to 5 times has no significant influence on the temperature distribution. Higher air velocity at lower height level is common for all the cases. Chilled beam spacing above 3.6m for intersecting flow resulted in more even airflow and temperature distribution. For all the cases studied thermal comfort indicator DR% is generally higher at 0.1m height level than 1.1m height level. The draught rate DR% is affected mostly by the air velocity. Draught rate at 20% is indicative of good thermal comfort and can be achieved at desk level. It was also found that the temperature and velocity fields can be affected by the heat sources in a space.