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78 TRG-TRC014-EN
notes
period six
Review
A simple building has two types of spaces: perimeter and interior. These two
space types require different types of VAV terminal units to satisfy their
requirements. It is important to realize that many VAV systems include a
combination of different types of terminal units based on individual space
requirements.
The VAV supply fan capacity is modulated in response to changing building
loads. Four methods of modulating fan capacity include: discharge dampers,
inlet vanes, fan speed control, and variable-pitch blade control.
Fan capacity is also controlled based on the static pressure in the system. There
are three common methods for sensing and controlling system static pressure:
fan outlet static-pressure control, supply duct static-pressure control, and
optimized static-pressure control.
Review—Period Three
perimeter spaces
interior spaces
Figure 107
Review—Period Four
VAV system
VAV system
modulation curve
modulation curve
airflow
airflow
static pressure
static pressure
A
design system
design system
resistance curve
resistance curve
actual system
actual system
resistance curve
resistance curve
B
performance
curve
performance
performance
curve
curve
Figure 108