Chapter hvac engineering Fundamentals: Part 1 Introduction

218
Figur
e
7.16
Central
plant
serving
a
w
ater
-to-air
heat
pump
system.
Design Procedures: Part 5
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 5
219
Figure 7.17
Engine driven cogeneration.
Figure 7.18
Turbine driven cogeneration.
configured flow diagram (P&ID) for the proposed system with subse-
quent design for each component. Detailed plant design is beyond the
scope of this book.
Cogeneration plants require a substantial feasibility study, for they
involve major capital expenditure which will be recovered only over
time under favorable economic conditions. Absolute commitment of
the owner to qualified operation and planned maintenance is required.
Conservative projections of fuel and power price conditions should be
used. The opportunity to use reject heat should be real. The very best
systems in economic terms are the ones that can use all of the power,
and all of the heat, all of the time. Beware of the cost of standby
systems. If power delivery is critical, standby production must be
available. If the local utility is used for standby production, it usually
Design Procedures: Part 5
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.

---