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Demystifying SelfSensing Pumps

Explore the benefits of self-sensing pumps over sensors, efficient system control curves, pump and valve designs, and operating points for enhanced performance and energy savings in commercial HVAC systems.

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Demystifying SelfSensing Pumps

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  1. DemystifyingSelfSensing Pumps

  2. System Curves 3-Way Control Valve Design Operating Point 300 Gallons Per Minute 53 Feet of Head 60 GPM each fan coil 150 ton system @ 12deg Delta T

  3. System Curves = Design Operating Point

  4. System Curves 3-Way Control Valve

  5. Pump Curves

  6. Pump Curves Taco Test Lab

  7. Pump Curves Input Electrical Power

  8. Pump Curves KS Model 4009 Test Data at 1760 RPM

  9. Pump Curves KS Model 4009 Test Data at 1760 RPM

  10. Pump Curves KS Model 4009 Test Data at 1760 RPM

  11. Pump Curves KS Model 4009 Test Data at 1760 RPM

  12. Pump Curves KS Model 4009 With an 8.00” impeller Test Data at 1760 RPM

  13. SelfSensing Pumps

  14. SelfSensing Pumps vs. Sensors Resulting System Performance Correct Sensor Location Shaded area represents energy savings compared to constant speed pumps

  15. SelfSensing Pumps KS Model 4007 With 7.5 horsepower motor and VFD With a 7.50” diameter impeller Test data displayed below

  16. SelfSensing Pumps • Each pump goes through a complete data collection process • The data points are plotted to create pump curves at various speeds

  17. SelfSensing Pumps • The SelfSensing pump operates anywhere in the dark grey area of the graph

  18. SelfSensing Pumps 3-Way Valve Constant Flow Variable Flow

  19. SelfSensing Pumps Valves Closed Minimum Flow Valves Open Maximum Flow

  20. SelfSensing Pumps Valves Closed Minimum Flow Valves Open Maximum Flow 60 Hz 50 Hz 40 Hz 30 Hz 20 Hz

  21. SelfSensing Pumps Valves Open Maximum Flow Valves Closed Minimum Flow 60 Hz Control Curve 20 Hz

  22. SelfSensing Pumps During increasing demand, the pump rides to the right (down) on the pump curve. The SelfSensing pump automatically responds and keeps the pump on the control curve. (follow A to B and so on)

  23. SelfSensing Pumps During decreasing demand, the pump rides to the left (up) on the pump curve. The SelfSensing pump automatically responds and keeps the pump on the control curve. (follow I to J and so on)

  24. SelfSensing Pumps Valves Closed Minimum Flow Valves Open Maximum Flow Constant Flow 60 Hz 20 Hz

  25. SelfSensing Pumps Valves Open Maximum Flow Valves Closed Minimum Flow Constant Pressure 60 Hz 20 Hz

  26. SelfSensing Pumps When you use the pump selection wizard, the software generates a control curve that is unique to your system configuration. If you do not specify a control head, at time of order, Taco uses 40% of the design operating point. You can adjust the control headon the selection wizard and specify the desired value on your order Control Head Control Head Adjustment

  27. SelfSensing vs. Sensors

  28. SelfSensing Pumps vs. Sensors • Sensors are frequently placed in the wrong location in the system; this incorrect sensor placement results in system inefficiency. • In a typical system, trial and error must be used (i.e. physically moving the sensor) until the optimum location is determined. • Another strategy is to use multiple sensors to increase the odds of correct placement. • These strategies can become costly. • Even if correct placement is achieved, correct setpoint is rarely used.

  29. SelfSensing Pumps vs. Sensors Resulting System Performance Incorrect Sensor Location Shaded area represents energy savings compared to constant speed pumps

  30. SelfSensing Pumps vs. Sensors Resulting System Performance Correct Sensor Location Shaded area represents energy savings compared to constant speed pumps

  31. SelfSensing Pumps vs. Sensors The SelfSensing pump has an advantage over sensors because you no longer have to worry about the sensor location. The SelfSensing pump automatically operates on the control curve shown. You can quickly adjust the control head on a SelfSensing pump in the field. Adjusting the control head is akin to moving the sensor to a new more optimal location in the building. This optimization strategy is now significantly quicker and cheaper when using a SelfSensing pump. Control Curve Control Head If you are having trouble deciding whether to use a SelfSensing pump or a sensor, just ask: How often does the construction team know in advance what the optimum location will be? How often does the construction team place the sensor in the perfect location?

  32. SelfSensing Pumps vs. Sensors

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