Passive displacement cooling (PDC) system is a state-of-the-art air-conditioning concept using natural convection to deliver conditioned air to cool heat producing objects such as occupants and computers, without mechanical fans. NTU is implementing this system progressively within the campus in new and retrofitting projects.

PDC itself is not a new technology, as it relies on simple natural convection to bring conditioned air to the heat sources within the space to be cooled. The room air is first cooled by cooling coils placed at high level. As it cools, it becomes heavier, sinks down the cavity wall and discharges at the bottom. The cold air then moves horizontally just above the floor to the heat sources, which then heat up the air and cause it to rise. The newly warmed spacing air is then drawn to the cooling coils and the cycle repeats itself.

Speaker: Mr. Tong Kok Kwang (KK Tong)