Chapter hvac engineering Fundamentals: Part 1 Introduction

10.12
Heat Exchangers—Water Heating
Heat exchangers for steam to water or water to water are commonly
of the shell-and-tube type similar to those described in Chap. 9. A
steam-to-water exchanger (Fig. 10.10) could also be called a
steam con-
denser,
because it is the latent heat of condensation which is being
used to heat the water. The steam is in the shell, the water in the
tubes. The system is controlled as shown in Fig. 10.11. For more ac-
curate control at light loads, it is common practice to use two control
valves in parallel, sequenced, with the smaller valve sized to handle
one-third of the load. It is more difficult to control with higher steam
Equipment: Part 2
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.

---