Chapter hvac engineering Fundamentals: Part 1 Introduction

Equipment: Part 3
369
Figure 11.2
Psychrometric chart for blow-through air conditioning process.
Humidity control is not always required, but some upper limit will
be inherent in any refrigeration-type cooling process—chilled water,
brine, or direct expansion.
Supply air-handling equipment may be classified in several different
ways:
1.
Type or arrangement.
The five basic arrangements are single-
zone, multi-zone, double-duct, variable air volume (VAV), and in-
duction.
2.
Package versus built-up.
Package equipment is factory-assembled,
and when it is installed, it requires only connections for utilities
and ductwork. The term
built-up
implies that most of or all the
components are field-assembled and installed.
3.
Self-contained.
A self-contained system includes internal thermal
energy generation.
4.
Central station and terminal units.
Central station equipment is
remote from and delivers air through ductwork to the conditioned
space. Terminal units are installed in or adjacent to the conditioned
space. Terminal units are used in conjunction with central station
equipment.
Equipment: Part 3
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