Pump:VariableSpeed
Used in:
Plant and Condenser loops
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Used in:
Plant and Condenser loops |
The auto-generated name for the pump.
The type of the variable speed pump is fixed as:
To change from variable speed to constant speed you most open the parent Plant or Condenser loop dialog and change the Plant loop flow type to 1-Constant flow.
This numeric field contains the pump’s rated power consumption (in W). If the user is performing a pressure simulation on the loop in which this pump is found, this value would only be used to estimate pump efficiency. During reported calculations, the pump would use the loop pressure drop and current flow conditions along with efficiency to calculate pump power dynamically.
This numeric field contains the pump’s rated head pressure (in Pascals or ftH2O).
Important Note: The default pump head provided by the Plant and Condenser Loop templates is 20,000 Pa. This may be suitable for a small building, but it is important that you enter the correctly sized pump head if you wish to simulate pump energy consumption accurately in your model.
This numeric field contains the pump’s rated volumetric flow rate (in m3/s or gal/min). This setting comes from the Plant loop Maximum loop flow rate and cannot be accessed.
This field contains the minimum volumetric flow rate while operating in variable flow capacity rate (in m3/s or gal/min).
This numeric field contains the pump’s motor efficiency in decimal form (0 = 0%, 1 = 100%).
This numeric field contains the pump’s fraction of power loss to the fluid.
This is a choice field of:
A variable speed pump is defined with maximum and minimum flow rates that are the physical limits of the device. If there is no load on the loop and the pump is operating intermittently, then the pump can shutdown. For any other condition such as the loop having a load and the pump is operating intermittently or the pump is continuously operating (regardless of the loading condition), the pump will operate and select a flow somewhere between the minimum and maximum limits. In these cases where the pump is running, it will try to meet the flow request made by demand side components.
Use the pump curve template to load some pre-defined pump coefficients to the dialog.
The fraction of full load power is determined during the simulation by the cubic equation:
FractionFullLoadPower = C1 + C2. PLR + C3 PLR2 + C4.PLR3
where C1to C4are the coefficients described below and PLR is the Part Load Ratio.
This numeric field contains the first coefficient, C1, in the part load ratio curve.
This numeric field contains the second coefficient, C2, in the part load ratio curve.
This numeric field contains the third coefficient, C3, in the part load ratio curve.
This numeric field contains the fourth coefficient, C4, in the part load ratio curve.
HVAC,Average,Pump Electric Power [W]
HVAC,Sum,Pump Electric Consumption [J]
HVAC,Average,Pump Shaft Power [W]
HVAC,Average,Pump Heat To Fluid [W]
HVAC,Sum,Pump Heat To Fluid Energy [J]
HVAC,Average,Pump Outlet Temp [C]
HVAC,Average,Pump Mass Flow Rate [kg/s]
These outputs are the electric power input to the pump motor. Consumption is metered on Pumps:Electricity, Electricity:Plant, and Electricity:Facility.
This is the shaft power delivered from the motor to the pump.
These outputs are the energy added to the fluid as heat. For the current algorithm, this is equal to Pump Shaft Power, because the loops are closed and all energy added to the fluid will ultimately become heat due to friction.
These outputs are the water outlet temperature and mass flow rate.