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Design Procedures: Part 4
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SOURCE: Reprinted by permission from Thermodynamic Properties of Steam, J H Keenan and F G Keyes, published by John Wiley and Sons, Inc, 1936 edition Subsequent editions have equivalent data
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TABLE 62
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Properties of Water, 212 to 400 F
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Design Procedures: Part 4 Design Procedures: Part 4 151
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actual heat rejection will vary with the refrigeration system ef ciency and will usually be somewhat less than 15,000 Btu/(ton h), except that for absorption refrigeration, rejection will be 20,000 to 30,000 Btu/(ton h) 64 High-Temperature Water
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High-temperature water (HTW) systems operate with supply water temperatures over 350 F and with a pressure rating of 300 to 350 lb/ in2 gauge (psig) Maximum temperatures are about 400 F in order to stay within the 300 lb/in2 gauge limit on pipe and ttings Mediumtemperature systems operate with supply water temperatures between 250 and 350 F, which allows the use of 150 lb/in2 gauge rating on piping systems Table 62 lists properties of water at temperatures up to 400 F Systems must be kept tight because water at these temperatures will ash instantly to steam at any leak Large temperature drops at heat exchangers are typical 150 to 200 F is normal The system must be carefully pressurized to above the saturation pressure corresponding to the water temperature, to prevent the water from ashing into steam Heat exchangers are used to provide lower-temperature hot water or steam for HVAC use HTW may be used directly for generation of domestic hot water Most jurisdictions require double-wall heat exchangers to guarantee protection from tube failure and crosscontamination It is common to place user equipment in series, taking part of the HTW temperature drop through each device (Fig 63) Steam generation, at other than low pressure (less than 15 psig), is not a good load for an HTW system It is desirable to maximize the temperature difference between the HTW supply and return, so that the central plant may operate more ef ciently 65 Secondary Coolants (Brines and Glycols) Brine is a mixture of water and any salt, with the purpose of lowering the freezing point of the mixture In HVAC practice, the term is also applied to mixtures of water and one of the glycols Brines are used as heat transfer uids when near- or subfreezing temperatures are encountered Ice-making systems for thermal storage often use a brine solution as part of the scheme Brines may be used directly in cooling coils of air-handling units or, through heat exchangers, may be used to provide chilled water Brines are also commonly used in runaround
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Design Procedures: Part 4 152 Six
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Figure 63 HTW end use, with cascading
heat reclaim systems (see Chap 7) Heating systems exposed to subfreezing air may use a glycol solution as a circulating medium
651 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 63 and 64 For commercial-grade brines, use the formulas in the footnotes to the tables Note particularly that the speci c heat decreases as the percentage of the salt increases Thus, a 25% solution of calcium chlo-
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TABLE 63
Properties of Pure Calcium Chloride Brine
Design Procedures: Part 4
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*Mass of water per unit volume Brine mass minus CaCl2 mass Speci c gravity is solution at 60 F referred to water at 60 F SOURCE: Copyright 2001, American Society of Heating, Refrigerating and Air Conditioning Engineers, Inc, wwwashraeorg Reprinted by permission from ASHRAE Handbook, 2001 Fundamentals, Chap 21, Table 1
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