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40 TRG-TRC014-EN
notes
period three
System Configurations
To permit a complete understanding of the VAV system, we must look at it from
a system level. In this section we will explore a few common space types and
how VAV systems address the cooling and heating needs associated with them.
For simplicity, a typical building can be described as having two types of
spaces, perimeter and interior.
In many climates, perimeter spaces with walls and windows exposed to the
outdoors require seasonal cooling and heating. Such spaces require cooling in
the summer: it is warm outside, the sun is shining through the windows, people
are occupying the space, and the lights are on. In the winter, when it is cold
outside, these spaces require heating to offset the “skin” heat loss through the
exterior walls and windows.
Most interior spaces require year-round cooling due to the absence of skin
heat losses and the fairly consistent amount of heat generated by people, lights
VAV Systems
period three
System Configurations
Figure 55
Perimeter (P) Versus Interior (I)
Figure 56