Page 28 - HVAC Pump Handbook

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Physical Data for HVAC System Design

Physical Data for HVAC System Design 25

Figure 2.4 Viscosity of heat transfer fluids. (From Engineering Data for Ethylene
Glycol–Based Heat Transfer Fluids, Union Carbide Corporation, Danbury, Conn., 1993,
p. 20.)

percentage of glycol to prevent slush formation at the minimum oper-
ating temperature should be sought from the supplier of the heat-
transfer fluid.
There is an appreciable variation in the specific heat of glycol-based
heat-transfer solutions. It is less than that of water for most percent-
ages of glycol. Figure 2.7 provides the specific heat for ethylene
glycol–based heat-transfer solutions. The pump flow, in gallons per

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