Chapter hvac engineering Fundamentals: Part 1 Introduction

152
Chapter Six
Figure 6.3
HTW end use, with cascading.
heat reclaim systems (see Chap. 7). Heating systems exposed to sub-
freezing air may use a glycol solution as a circulating medium.
6.5.1
Properties of secondary coolants
Calcium and sodium chloride solutions in water have been the most
common brines. Properties of pure brines are shown in Tables 6.3 and
6.4. For commercial-grade brines, use the formulas in the footnotes to
the tables. Note particularly that the specific heat decreases as the
percentage of the salt increases. Thus, a 25% solution of calcium chlo-
Design Procedures: Part 4
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