Chapter hvac engineering Fundamentals: Part 1 Introduction

19.2.2
Humidity ratio
The
humidity ratio w
is the ratio of the mass of the water vapor to
the mass of the dry air in a sample of moist air. The
specific humidity
is the ratio of the mass of the water vapor to the total mass of the
moist air sample. Although the two terms are often used interchange-
ably, they are not identical.
19.2.3
Degree of saturation
The degree or percentage of saturation
␮
is the humidity ratio
w
of a
moist air sample divided by the humidity ratio
w
s
of saturated air at
the same temperature and pressure.
w
␮
⫽
(19.1)
w
s
Engineering Fundamentals: Part 4
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