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Basics of Pump Application for HVAC Systems Basics of Pump Application for HVAC Systems 301
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can easily observe the kW input and the number of pumps in operation from the computer screen The following evaluation is from an actual study to determine the value of using three 50 percent pumps in lieu of two 100 percent pumps as well as two constant-speed pumps The pumps head-flow curves and the system head curves are shown in Fig 1015 These tables provide the energy consumption for all the above pumps This study reveals several factors that must be taken into consideration when selecting the number and size of pumps operating in parallel These are: 1 Load curve At what percentages of the design load do actual loads occur on the water system Does the system operate at light loads much of the time or at heavy loads 2 Power supply What is the quality of the power supply and the cost of power 3 Reliability How important is reliability Is the double standby of the three 50 percent pumps desirable 4 Constant or variable speed What are the energy savings for variable speed Three energy evaluations will be made: (1) kW input for one 100 percent capacity variable-speed pump; (2) kW input for two 50 percent capacity, variable-speed pumps, and (3) kW input for a constant-speed, 100 percent capacity pump
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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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160 100% Capacity pump 140 50% 70% 120 50% Capacity pump 100 Pump head ft Efficiency is 865% at 1500 GPM 80 Efficiency is 892% at 3000 GPM 80% 84% 86% 86% 89% 60% 70% Possible 75% capacity pump 80%
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60 System head curve for one 50% capacity pump 40 System head curve for two 50% or one 100% capacity pumps
0 0 500 1000 1500 System flow GPM
Percent head-flow and system head curves
A third computation was run with all three pumps in operation There were no energy savings for this system with all three pumps running, so the calculations were not included Such is not the case with many three-pump systems where operating all three pumps, save energy at the highest flows in the water system The data of Tables 108, 109, and 1010 demonstrates the advantages of each of the three installations A summary of the kW inputs is shown graphically in Fig 1016 This indicates the following:
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
Basics of Pump Application for HVAC Systems Basics of Pump Application for HVAC Systems 303
kW Input Calculations for a System with Two 100 Percent Capacity Pumps (Only one pump runs at a time) System gal/min 300 600 900 1200 1500 1800 2100 2400 2700 3000
NOTE:
TABLE 108
System head, ft 309 332 367 414 472 541 620 710 810 920
Water hp 23 50 83 125 179 246 329 430 552 697
Fitting loss, ft 01 03 07 13 20 29 39 51 65 80
Pump head, ft 310 335 374 420 492 508 570 660 875 1000
Pump rpm 845 898 972 1057 1162 1273 1393 1516 1645 1780
Pump effy 369 592 725 805 848 872 884 890 892 892
Drive effy 706 753 795 832 861 884 899 913 924 930
Input kW 67 85 110 144 191 251 328 424 540 681
Pump efficiencies are in percent
1 The single 100 percent capacity, variable-speed pump, from 1200 to 3000 gal/min is the most efficient This is due to the higher pump and wire-to-shaft efficiencies 2 For very light loads less than 1000 gal/min, the 50 percent capacity pump is the most efficient
TABLE 109
Total kW Input for Two 50 Percent Capacity Pumps System head, ft Water hp Fitting loss, ft Pump head, ft Pump rpm Pump effy Drive effy Input kW
System gal/min
One pump running 300 600 900 1200 1500 1800 309 332 367 414 472 541 23 50 83 125 179 246 03 13 29 51 80 115 312 344 396 465 552 656 879 970 1097 1265 1451 1654 591 830 870 829 774 727 660 741 811 859 892 914 45 63 95 148 226 335
Two pump running 300 600 900 1200 1500 1800 2100 2400 2700 3000 309 332 367 414 472 541 620 710 810 920 23 50 83 125 179 246 329 430 552 697 01 03 07 13 20 29 39 51 65 80 310 335 374 427 492 570 660 762 875 1000 853 912 980 1067 1164 1266 1387 1510 1638 1760 352 576 717 798 842 863 871 872 869 865 621 681 731 778 818 850 872 893 909 919 80 97 121 155 202 263 344 442 563 712
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