Chapter hvac engineering Fundamentals: Part 1 Introduction

1.8
Psychrometrics
*
Psychrometrics
is the science of the properties of moist air, i.e., air
mixed with water vapor. This subset of thermodynamics is important
to the HVAC industry since air is the primary environment for all
HVAC work. Whereas oxygen, nitrogen, and other components of dry
air behave similarly in only a vapor phase in the HVAC temperature
range, water will undergo a change of state in the same temperature
range based on pressure, or in the same pressure range based on tem-
perature. In the human comfort temperature range, the comfort of
people and the quality of the environment for health, for structures,
and for preservation of materials are also related to the moisture in
*See also Chap. 19.
HVAC Engineering Fundamentals: Part 1
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