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be best to locate an air separator near the suctions of the distribution pumps with air vents at the high points where the system pressure is the lowest For heating systems with high supply water temperatures, it may be advisable to add a dip tube and an air vent at the water discharge from the heater or boiler These tables also demonstrate that it is wise to have manual or automatic air vents at the top of a building where the system pressure is the lowest A detailed discussion of air removal from HVAC water systems is included in Chap 9
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Air solubility and water system pressure
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The solubility of air in water increases appreciably with the pressure on the water system as can be seen from Table 25 Figure 21 demonstrates this; 45 F chilled water can have seven times as much dissolved air at 100 psig pressure as can a system operating at 0 pressure It is, therefore, important that water systems be operated at the lowest possible pressure without losing pressure at the top of a building or water
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Solubility of air in water
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Physical Data for HVAC System Design Physical Data for HVAC System Design 23
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system Ten psig is adequate pressure at the top of most buildings or water systems
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245 Velocity of sound in water
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The velocity of sound in water is important, as it can indicate the speed of pressure waves in water systems The speed of sound in water is faster than in air (Fig 22) These waves are generated by manual or automatic valves opening or closing or by pumps being started or stopped Also, noisy pumps operating near the shutoff condition or far out on their curve can transmit noise through the connected water system
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246 Pressure variations in water of a HVAC system
Figure 23 describes the results of a test conducted on a HVAC chilled water system to determine the variations in differential pressures across coil control valves throughout one day This figure demonstrates that HVAC water systems with a number of coil control valves can be a restless place This figure indicates the need for properly designed and sized coil control valves along with adequate control response
Figure 22 Velocity of sound in water (From Karassik et al, Pump Handbook, 3rd ed,
McGraw-Hill, used with permission)
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Physical Data for HVAC System Design 24 The Basic Tools
As loads and flows vary, differential pressure variation across control valves is even more pronounced than the differential pressure across the whole building
Building differential pressure (psi)
15 Time over one day (Summer 2003)
Typical building differential pressure profile (Courtesy of Flow Control Industries Woodinville, WA)
25 Glycol-Based Heat-Transfer Fluid (HTF) Solutions Glycol-based heat-transfer solutions are prevalent in the HVAC industry Glycol is used to (1) avoid freezing in equipment of an HVAC water system such as heating and cooling coils and (2) to transfer heat to and from energy storage tanks that use ice There is a substantial variation in both viscosity and density of the solution as the percentage of glycol is varied with temperature Information is provided on ethylene glycol based heat-transfer fluids, since they have been the most used in the HVAC industry Special applications of glycol-based heat-transfer fluids, such as contact with potable water or food, may require the use of propylene glycol based solutions Figure 24 provides information on the viscosity and Fig 25 on the specific gravity of ethylene glycol based heat-transfer solutions Care should be taken to avoid using glycol solutions near their freezing curves because slush occurs there that will change radically the pump s performance Figure 26 provides the freezing curve for an ethylene glycol based heat-transfer fluid Verification of the minimum
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