Page 76 - HVAC Pump Handbook

Rishel_CH03.qxd 20/4/06 5:35 PM Page 73

Piping System Friction
Piping System Friction 73

Figure 3.10 (Continued)

3.8 Hydraulic-Gradient Diagrams
The hydraulic-gradient diagram was first mentioned in Chap. 1. It
will be found throughout this book as a tool for describing the various
pumping and circuiting procedures for HVAC water systems. It
should be pointed out that hydraulic-gradient diagrams include only
static and physical pressures. Velocity head is a dynamic head and is
therefore not included in hydraulic-gradient diagrams.
The hydraulic-gradient diagram is an excellent method of check-
ing energy transformations in a building. It is somewhat a graphic

Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com)
Copyright © 2006 The McGraw-Hill Companies. All rights reserved.
Any use is subject to the Terms of Use as given at the website.