Page 7 - HVAC Pump Handbook

Rishel_CH01.qxd 20/4/06 5:11 PM Page 4

Digital Electronics and HVAC Pumps

4 The Basic Tools

Ohio. APEC, a nonprofit, worldwide association of consulting engineers
and in-house design group, is dedicated to improving quality and pro-
ductivity in the design of HVAC air and water systems through the de-
velopment and application of advanced computer software.
The APEC PSA-1 program accurately calculates the friction losses
and sizes of pipes as well as simulating flow under different operating
conditions in either new or existing piping systems. Analyzing the
fluid flow in systems with diversified loads, multiple pumps, and
chillers or boilers is essential if engineers are to truly understand the
real operating conditions of large HVAC water systems. This under-
standing can only be achieved through the use of a computer program
capable of such thorough analysis.

1.2.1 Typical input for APEC piping system
analysis program
The following is representative system data into an APEC’s computer
program for calculating pipe sizing, friction, and flow analysis, and
typical output.

Master Data files
Pipe, fitting, and valve files

Material friction loss
Actual ID for nominal copper type (M,L)
Steel schedule other
Standard pipe pre-entered or custom. Cost estimation optional.

Insulation file
Type
K value
Thickness
Cost estimation optional
Fluids. Provisions for all fluid types with:
Density Temperature
Viscosity Specific heat

System data
Pipe environment Required for heat/loss gain
Space temperature Outside air temperature
Soil conductivity Burial depth

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.