Abstract
The terminal device (VAVBOX) is the key part in variable air volume (VAV) air conditioning system, by which we can adjust air output, compensate indoor load change, keep room temperature to be constant. The control effect of VAV system depends largely on the performance of terminal device and the coordination between terminal device and the whole system. In this paper, BAS - 3520 DDC produced by Advantech corporation is used to design VAV air conditioning pressure independent terminal controller. Experiments show that the terminal controller based on DDC can well satisfy the system control requirement, the transition time and overshoot of the indoor temperature achieve good improvement. At the same time , with Webaccess introduced, VAV BOX operation condition can be monitored by host computer, what makes the daily management of the VAV BOX more intelligent.
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