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The Use of Water in HVAC Systems
The Use of Water in HVAC Systems 227
Figure 8.5 Coil connections for hot and chilled water systems.
the building chilled water system is in operation. Also, the wire-to-
water efficiency of many coil pumps is low, around 35 to 45 percent,
when compared with most secondary pumps that have similar efficien-
cies of 60 to 70 percent. Further, the added piping and wiring raises
the first cost and increases the total friction head of the system.
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