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Configuring an HVAC Water System Configuring an HVAC Water System 271
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T From pumps To building To pump speed control To pumps Building pump Locate differential pressure transmitter for system pumps if this is a critical building or at the point of highest pressure loss in system
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Heat exchanger for high risk building (From Patterson Pump Company HVAC Pumps and Systems Manual, 2004)
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One of the concerns for the control valve of Fig 913 is the great loss that may be incurred in it at light loads on the building Through adaptive control, the set point for the differential pressure transmitter can be reset on light loads through a valve position indicator/transmitter on the control valve as per Fig 914 The differential pressure across
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Valve position indicatortransmitter To pump speed control From pumps To pump speed control To pumps Heat exchanger Set point is adjusted by valve position to hold valve to 80 to 85 % open
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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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Configuring an HVAC Water System 272 The HVAC World
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Set point is adjusted by valve position to hold valve to 80 to 85% open
Air-handling unit coil
Valve position control on air-handling unit coil
the heat exchange is adjusted so that the control valve is always 80 to 85 percent open For example, if the set point is 20 ft at design load, it may be only 5 ft at minimum load Not only is friction loss reduced through the control valve, but the constant pressure established for the system is reduced by the lower set point Similar control can be utilized on large air-handling units, Fig 915, where high set points such as 35 ft are required for them, and only 15 ft is required for the other coils The set point for the large air handler may be down near the 15 ft for other coils much of the time when part-load conditions exist on the air-handling unit 911 Bibliography
James B Rishel, Variable Water Volume Is Hydro-Electronics, SYSTECON, Inc, West Chester, Ohio, 1982 James B Rishel, The Water Management Manual, SYSTECON, Inc, West Chester, Ohio, 1992 James B Rishel, Simplifying Contemporary HVAC PIPING, ASHRAE JOURNAL, Vol 47, No2, pp16 25, FEBRUARY 2005
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Source: HVAC Pump Handbook
Basics of Pump Application for HVAC Systems
101 Introduction The configuration of a hot or chilled water system was emphasized in Chap 9 to achieve the desired heating or cooling with a minimum of flow and head This chapter undertakes evaluation of the pumps themselves to achieve optimal energy consumption for the pumps It was necessary for the readers to have a basic understanding of HVAC water systems before initiating this application of pumps Before embarking on the actual application of pumps to HVAC water systems, there should be a discussion of when to use constantspeed pumps and when to use variable-speed pumps With the rapid reduction in the cost of variable-speed drives, there is almost no limit, in terms of motor size, for the use of variable-speed pumps Very low head pumps, ie, less than 50 ft, can still be constant-speed pumps when applied to small systems Otherwise, the rule should be constantspeed pumps for constant-volume systems and variable-speed pumps for variable-volume systems If a water system has a large variation in its flow, from less than 50 to 100 percent of design, it is probably a candidate for variable speed Likewise, if the flow rarely changes and there is little variation in temperature or viscosity, this is a constant-speed pump application As was pointed out elsewhere, variable-speed pumping offers great savings in maintenance as well as in energy Further, variable-speed pumps, if controlled properly, operate at the system s flow and head requirements, not necessarily at the design conditions They eliminate overpressuring, which causes operational problems as well as loss of pumping energy
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