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the three systems using different coil and control-valve arrangements Similar energy evaluations will be made for condenser water in Chap 11
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Three-way valve system Figure 86a describes a secondary system with 10 air-handling units, each with a requirement of 200 gal/min, for a total design flow of 2000 gal / min Three-way valves are installed on the air handlers so that the flow is constant regardless of the load The coil, control-valve, and piping loss is 26 ft, the pump fitting loss is 8 ft, and the header losses are 50 ft, for a total pump head of 84 ft If the pumps have an efficiency of 86 percent and the motors have an efficiency of 92 percent, the total electrical consumption at any load is 40 kW Equations 612, 613, and 614 are used for this calculation Two-way valve system with coil circulators This system is similar to the three-way valve system above and is described in Fig 83b Each coil is fitted with a 11 2-hp circulator that has a pump duty of 200 gal/min at 16 ft The head of 16 ft results from a coil loss of 10 ft, pump fittings of 2 ft, balance valve of 2 ft, and pipe friction and fittings of 2 ft The pump has an efficiency of 67 percent, and the pump motor has an efficiency of 84 percent if it is of the high-efficiency type This pump runs continuously whenever the coil is in operation, and its energy consumption is 11 kW The secondary pumps have a total head of 72 ft, consisting of 8 ft of loss in the pump fittings, 50 ft in the system headers, and 14 ft of differential pressure across the coil, and its control valve and piping Each pump has an energy consumption of 175 kW at design flow with a pump efficiency of 86 percent and a wire-to-shaft efficiency of 90 percent Adding the circulator pump kilowatts to those of the secondary pumps produces a total kilowatts of 10 11 2 175 for a total energy consumption of 460 kW at full load with a system flow of 2000 gal/min Contemporary two-way valve system The same chilled water distribution system when equipped with two-way coil control valves would utilize variable/primary pumping (see Fig 86c) It is no longer necessary to use primary/secondary pumping since chillers can now accept variable flow in their evaporators This will be explained in detail in Chap 9 Without the friction loss in the secondary pump fittings, the friction loss of the chilled water system consists of 26 ft across the coils, control valves, and piping with 50 ft loss in the supply and return headers for a total of 76 ft The total energy consumption at 2000 gal/min is 37 kW with a pump efficiency of 86 percent and a wire-toshaft efficiency of 90 percent for the variable-speed drive and motor
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2006 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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The Use of Water in HVAC Systems The Use of Water in HVAC Systems 231
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84 Energy Comparison of the Three Systems Table 83 is a comparison of the three coil and valve arrangements or a system that has a system load range from 25 to 100 percent of maximum load Data are provided at 25, 50, and 100 percent system load The wire-to-water efficiencies of the variable-speed drives and motors were computed from the data shown in Table 86 The pump affinity laws (see Chap 6) were used to compute the efficiencies of the secondary pumps at reduced loads Table 83 provides the energy consumption of the pumps, while Table 84 lists the kilowatt effect on any chillers involved, Table 85 gives the net kilowatt effect on a chilled water system For the system as chilled water, assuming that the chiller kilowatts per ton is 080 and using Eq 810, Table 84 provides the chiller effect for the three different valve and coil arrangements
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