Airflow distribution performance comparison of four desktop task air conditioning systems

Task conditioning aims to provide each occupant with personalized clean air direct to the breathing zone. Microenvironment of a typical office workplace consisting of different task air conditioning system, such as CMP (computer monitor panel), MP (movable panel), horizontal desk grill (HDG) and vertical desk grill (VDG) are studied by numerical simulation. Numerical simulation by k-epsiv 3-D turbulent flow is separately conducted to study the influence of supply velocity on microenvironment of these four desktop task conditioning systems. Three task conditioning velocities, 0.8, 1.0, 1.2 m/s (for MP system: 0.6, 0.8, 1.0 m/s) are studied. Temperature and, draught rating (DR) and predicted percentage of dissatisfied (PPD) of the room and workstation are applied to study the performance of task air conditioning. The performances of these four task air conditioning system are compared based on the numerical results. According to simulated results, task air supplying performances of CMP is similar with that of MP, and performances of HDG and VDG are almost the same. Results also show that task conditioning can provide excellent working environment when supply velocity is well designed. The results can provide important references for system design, optimization of the task conditioning system.