Chapter hvac engineering Fundamentals: Part 1 Introduction

19.5.6
Chemical dehumidification
This process is described in Sec. 11.7.2.
19.6
The Protractor on the ASHRAE
Psychrometric Chart
Figure 19.1 includes a protractor above and to the left of the main
chart. For a full discussion of this tool, see Ref. 1.
One of the most important uses of the protractor is in determining
the slope of the
condition line
for the air being supplied to a space to
offset sensible and latent cooling loads. First, the sensible heat / total
heat ratio
S
/
I
, based on design load calculations, is calculated. For
example, if the total cooling load is 125,000 Btu / h and the sensible
Engineering Fundamentals: Part 4
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