Chapter hvac engineering Fundamentals: Part 1 Introduction



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HVAC HANDBOOK

44
Chapter Three
TABLE
3.14 Sol-Air Temperatures for July 21, 40

N Latitude
Design Procedures: Part 1
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com)
Copyright © 2004 The McGraw-Hill Companies. All rights reserved.
Any use is subject to the Terms of Use as given at the website.


Design Procedures: Part 1
45
TABLE
3.14 (
Continued
)
The hourly air temperatures in column 2 are for a location with a design temperature of
95

F and a range of 21

F. To compute corresponding temperatures for the other locations,
select a suitable design temperature from column 6, Table 3.2, and note the mean daily range
(column 7). For each hour, take the percentage of the daily range, indicated in Table 3.15,
and subtract from the design temperature.
Example:
Calculate the summer dry-bulb temperature at noon for Denver, Colorado.
Solution:
From Table 3.2, the daily range is 28

F and the 1 percent design dry-bulb tem-
perature is 93

F. From Table 3.15, the percentage of the daily range at noon is 23 percent.
Thus: dry-bulb temperature at noon

design dry-bulb

daily range

percentage

93

[28(23 / 100)]

86.6

F.
SOURCE
: Copyright 1997, American Society of Heating, Refrigerating and Air Condition-
ing Engineers, Inc., www.ashrae.org. Abstracted by permission from ASHRAE Handbook,
1997 Fundamentals,
Chap. 28, Table 1.

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