Headered Constant Flow Pump Library
In this section you can create new, copy, or modify headered constant flow pump library members. A headered pump assembly consists of 2 or more pumps connected together in parallel working in unison to create a single flow rate.
Note: Standard TRACE library members cannot be modified or deleted.
Product tab
Full Load Energy
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Default: 22 W/gpm, 348701.1 W/(m3/sec)
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Typical Range: 0 to 999,999,999,999,999
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Units: W, hp, kW, therms, W/(m3/sec), W/(gpm), W/(L/sec), W/((m3/sec)·Pa), W/(gpm·ftH2O), W/((L/sec)·Pa)
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Enter the Full load energy consumption value and select the appropriate units to describe the amount of energy consumed by this pump.
Pump Head
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Default: 60 ft H2O, 179352 Pa
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Typical Range: 0 to 999,999,999,999,999
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Units: Pa, kPa, ft H2O
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This numeric field contains the pump’s rated head pressure.
Motor Efficiency
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Default: 90%
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Typical Range: 0 to 100
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Units: %
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This numeric field contains the pump’s efficiency in terms of percent. For example, if 90% is the desired motor efficiency, enter 90 into the field and not 0.9.
Number of Pumps
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Default: 2
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Typical Range: 2 to 100
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The numeric field specifies the number of pumps present in the pump bank. All these pumps are connected in parallel internally.
Motor Heat to Fluid
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Default: 100%
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Typical Range: 0 to 100
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Units: %
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This value is the fraction of the motor heat that is added to the fluid stream. A value of 0 means that the motor is completely outside the fluid stream. A value of 100 means that all of the motor heat loss will go into the fluid stream and act to cause a temperature rise. This value must be between 0 and 100.
Flow Control
Default: Continuous
This is a choice field of Continuous or Intermittent. The operation of a constant speed pump is fairly straightforward. If the user designates a constant speed pump that is operating continuously, the pump will run regardless of whether or not there is a load. This may have the net effect of adding motor heat to the loop if no equipment besides the pump is turned on. If the pump is constant speed and operates intermittently, the pump will run at its full load capacity if there is a load on the loop and will cycle off if there is no load on the loop. Applicable availability managers (ref. Availability Manager Assignment List*) may override this control by forcing the pump to be on or off.