Ductless task air-conditioning

Task-ambient conditioning (TAC) systems have proven success in reducing power consumption, improving thermal comfort and enhancing air quality. However, the adoption of TAC has, however, been generally slow. We propose an improvement to TAC systems by disconnecting them from the central air-handler, effectively making them ductless. The Ductless Task Air- Conditioner (DTAC) utilises thermoelectric modules and phase change materials for heat exchange and heat sink respectively. Prototypes of DTAC have been developed concurrently with test regimes for the proof of concept. The paper also presents the technical studies performed on the prototypes to show its capability and limitations. Whilst still in its early stages, DTAC shows promise for delivering supplementary air-conditioning to office occupants, conserving overall airconditioning by allowing the central air-conditioner to have a higher temperature set-point and increasing occupant thermal comfort by allowing them to have direct control over their immediate thermal environment.