Chapter hvac engineering Fundamentals: Part 1 Introduction



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HVAC HANDBOOK

81
Chapter
4
Design Procedures: Part 2
General Concepts for Equipment Selection
4.1
Introduction
The purpose of this chapter is to outline the criteria used in the HVAC
system and equipment selection process, to describe some of the sys-
tems and equipment available, and to develop some of the underlying
philosophy and background related to system selection.
Details of specific systems and items of equipment are discussed in
later chapters.
4.2
Criteria for System and
Equipment Selection
The problem-solving process requires some criteria that can be applied
in describing and evaluating alternatives. In the selection of HVAC
systems, the following criteria (Table 4.1) are used—consciously or
unconsciously—because only rarely is the problem-solving process for-
mally applied.
1.
Requirements of comfort or process.
These requirements include
temperature, always; humidity, ventilation, and pressurization, some-
times; and zoning for better control, if needed. In theory at least, the
comfort requirement should have a high priority. In practice, this cri-
terion is sometimes subordinated to first cost or to the desires of some-
one in authority. This is happening less often as building occupants
become more sophisticated in their expectations. Process requirements
are more difficult and require a thorough inquiry by the HVAC de-
signer into the process and its needs. Until the process is fully under-
Source: HVAC Systems Design Handbook
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com)
Copyright © 2004 The McGraw-Hill Companies. All rights reserved.
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