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Figure 24 Viscosity of heat transfer fluids (From Engineering Data for Ethylene Glycol Based Heat Transfer Fluids, Union Carbide Corporation, Danbury, Conn, 1993, p 20)
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percentage of glycol to prevent slush formation at the minimum operating temperature should be sought from the supplier of the heattransfer 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 percentages of glycol Figure 27 provides the specific heat for ethylene glycol based heat-transfer solutions The pump flow, in gallons per
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Figure 25 Specific gravity of heat transfer fluids (From Engineering Data for Ethylene
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Glycol Based Heat Transfer Fluids, Union Carbide Corporation, Danbury, Conn, 1993, p 18)
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minute, is calculated from Eq 24: Pump flow, gal/min Btu/h 748 gal/ft3 cp T F 60 min/h 0125 Btu/h cp T F (24)
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Physical Data for HVAC System Design Physical Data for HVAC System Design 27
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Figure 26 Freezing points of heat transfer fluids (From Engineering Data for Ethylene Glycol Based Heat Transfer Fluids, Union Carbide Corporation, Danbury, Conn, 1993, p 10)
where cp T
specific heat of ethylene glycol heat-transfer solution at constant pressure differential temperature specific weight of water
Note All these values must be at the operating temperature of the solution For many glycol installations, this calculation should be run at several different operating temperatures For example, assume that an ethylene glycol based heat-transfer fluid has a heating load of 5 million Btu/h at 30 F with a differential temperature of 12 F The pumps will be operating with a 40% glycol solution From Fig 27, the
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Physical Data for HVAC System Design 28 The Basic Tools
Figure 27 Specific heat of heat transfer fluids (From Engineering Data for Ethylene Glycol Based Heat Transfer Fluids, Union Carbide Corporation, Danbury, Conn, 1993, p 24)
specific heat of the glycol will be 084, and from Fig 25, the specific gravity of the solution will be 1074 based upon water at 68 F or 6232 lb/ft3 Pump flow, gal/min 0125 5,000,000 084 12 6232 1074 926 gal/min
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Physical Data for HVAC System Design Physical Data for HVAC System Design 29
26 Steam Data Steam is used for many heating processes in HVAC Most of the steam data come from one source, namely, Keenan and Keyes Thermodynamic Properties of Steam This is a fundamental reference for any engineer working with steam Table 26 provides the basic steam data, while vapor pressures are included in Tables 23 and 24 for the computation of net positive suction head available and the determination of cavitation pressures at various operating temperatures In HVAC, there are two basic steam pressure ranges: (1) up to 15 psig (250 F) and (2) above 15 psig steam pressure This is derived from the American Society of Mechanical Engineers (ASME) boiler codes, (1) the Heating Boiler Code for steam pressures up to 15 psig and (2) the Power Boiler Code for steam pressures above 15 psig See Chap 19 for additional information on boilers
TABLE 26
Basic Steam Data Enthalpy, Btu/lb
Absolute pressure, lb/in2 147 16 18 20 22 24 26 28 30 35 40 45 50 60 70 80 90 100 125 150 174 200
NOTE: SOURCE:
Steam temperature, F 21200 21632 22241 22796 23307 23782 24225 24641 25033 25928 26725 27444 28101 29271 20292 31203 32027 32781 34433 35842 37029 38179
Saturated liquid 18007 18442 19056 19616 20133 20614 21062 21483 21882 22791 23603 24336 25009 26209 27261 28202 29056 29840 31568 33051 34310 35536
Evaporation 9703 9676 9636 9601 9568 9537 9507 9479 9453 9392 9337 9286 9240 9155 9079 9011 8947 8888 8754 8636 8533 8430
Saturated vapor 11504 11520 11542 11563 11581 11598 11613 11627 11641 11671 11697 11720 11741 11776 11806 11831 11853 11872 11911 11941 11964 11984
Absolute pressure gauge atmospheric pressures Joseph H Keenan and Frederick G Keyes, Thermodynamic Properties of Steam, Wiley, New York, 1936
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