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Basics of Pump Application for HVAC Systems
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Connection of differential pressure transmitters
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Basics of Pump Application for HVAC Systems
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Particular applications of differential pressure transmitters to HVAC hot and chilled water systems
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Basics of Pump Application for HVAC Systems 318 The HVAC World
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Figure 1022b This building is typical of reverse return systems requiring a differential pressure transmitter at each end of the loop One differential pressure transmitter can be located at the center point of the reverse return loop if the distribution friction of the supply and return loops is less than 20 ft Buildings that have a great amount of glass and a pronounced sun load may require a differential pressure transmitter on both the east and west sides of the building, regardless of the configuration of the piping A number of control procedures are being developed to control variable-speed pumps; some have been successful, and some have not Following are control techniques for loop-type variable-speed pumping systems that have not been successful: 1 Locating the differential pressure transmitter across the pumps instead of at the end of the loops There is little reason for using variable-speed pumps with this control procedure The design pump head must be the set point for the differential pressure controller; therefore, there is very little reduction in pump speed, whatever the load on the building 2 Temperature control by valve stem position This method of controlling chilled and hot water systems can be expensive and difficult to calibrate The position of a particular valve stem has no relationship to the flow of water passing through the valve Figure 1023a describes why this is so Valve A close to the pumps will have a greater flow at a specific valve position than valve B at the end of the loop It is difficult to correlate an analog representing valve position to pump speed without excessive hunting Pumps and their controls are designed to respond to pressure changes; this is why the differential pressure control method has been so successful over the past 25 years A combination of differential pressure control and valve position reset is possible, as shown in Fig 1023b The differential pressure transmitter is still the principal means of controlling the pump speed, but the differential pressure set point is established by the energy management system, which changes the set point as the valves recede from full-open position This is uneconomical unless the valve position of all the control valves is being sent to the building management system as part of the standard control system A typical differential pressure valve position schedule would be
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Any valve fully open: All valves 90 percent open: All valves 80 percent open: 25 ft 22 ft 19 ft
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Basics of Pump Application for HVAC Systems Basics of Pump Application for HVAC Systems 319
Use of control-valve position for differential pressure reset
All valves 70 percent open: All valves 60 percent open: All valves 50 percent open:
16 ft 14 ft 12 ft
3 Return water temperature control Fortunately, this method of control is not seen very often It absolutely will not work! Return
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Basics of Pump Application for HVAC Systems 320 The HVAC World
water temperature has no relationship to system load on variablevolume systems; it should be maintained as closely as possible to a constant value For example, a chilled water system operating with 44 F supply temperature and 56 F return temperature should hold these temperatures whether the load is heavy or light on the system Therefore, return temperature cannot possibly be used as a control parameter for variable-speed pumping Often there has been confusion of variable return water temperature that results from the use of three-way valves; these systems were, of course, constant-volume systems and not used with variable-speed pumps for most applications
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