Chapter hvac engineering Fundamentals: Part 1 Introduction

19.5.2
Sensible heating and cooling
The word
sensible
implies that the heating or cooling takes place at a
constant humidity ratio. These processes are shown as horizontal
lines—constant value of
w
—with the dry-bulb temperature increasing
for heating (line
AB
in Fig. 19.4) and decreasing for cooling (line
CD
in Fig. 19.4). Note that although the humidity ratio remains constant,
there is a change in the relative humidity. As the dry-bulb tempera-
ture increases, the air will hold more moisture at saturation.
Engineering Fundamentals: Part 4
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