Demystifying SelfSensing Pumps. Design Operating Point 300 Gallons Per Minute 53 Feet of Head System Curves 150 ton system @ 12deg Delta T 60 GPM each.

DemystifyingSelfSensing Pumps

Design Operating Point300 Gallons Per Minute53 Feet of Head

System Curves

150 ton system @ 12deg Delta T

60 GPM each fan coil

3-Way Control Valve

0 100 200 300 400 500 6000

20

40

60

80

100

120

140

System Curve

Flow (Q) in GPM

Hea

d (

H)

in F

eet

System

Capacity (Q) in GPM

Head (H) in Feet

0.00 0100.00 7200.00 25300.00 53400.00 90500.00 136

Design Operating Point

=

System Curves

System Curves3-Way Control Valve

Pump Curves

Pump Curves

Taco Test Lab

Pump Curves

Input Electrical Power

9.25" Diameter 8.00" Diameter 6.75" Diameter

Capacity (GPM)

Head (Ft)

Efficiency (%)

BHP (HP)

Capacity (GPM)

Head (Ft)

Efficiency (%)

BHP (HP)

Capacity (GPM)

Head (Ft)

Efficiency (%)

BHP (HP)

0.00 84.46 -0.05 4.25 0.00 59.55 -0.16 2.86 0.00 39.24 -0.10 1.75

54.17 84.57 25.83 4.48 45.83 59.76 24.24 2.88 37.50 39.31 20.80 1.79108.33 84.75 44.23 5.24 100.00 59.74 44.25 3.40 75.00 39.14 37.46 1.98189.58 84.13 62.21 6.47 160.42 59.05 58.87 4.06 131.25 38.31 55.31 2.30216.67 83.51 66.36 6.88 200.00 58.00 65.04 4.50 150.00 37.84 59.56 2.41270.83 81.45 72.60 7.67 252.08 55.80 70.45 5.04 206.25 35.64 67.94 2.73325.00 78.17 76.49 8.39 300.00 52.76 73.03 5.47 225.00 34.60 69.40 2.83433.33 67.71 77.92 9.51 343.75 49.07 73.63 5.78 281.25 30.36 70.07 3.08406.25 70.82 78.38 9.27 400.00 42.84 71.44 6.05 300.00 28.54 69.01 3.13487.50 60.54 75.20 9.91 458.33 34.60 64.85 6.18 375.00 19.10 56.70 3.19541.67 52.15 69.85 10.21 500.00 27.43 56.08 6.17 412.50 13.14 43.96 3.11650.00 32.11 50.10 10.52 550.00 17.43 39.85 6.07 450.00 6.49 24.71 2.99

KS Model 4009 Test Data at 1760 RPMPump Curves

9.25" Diameter 8.00" Diameter 6.75" Diameter

Capacity (GPM)

Head (Ft)

Efficiency (%)

BHP (HP)

Capacity (GPM)

Head (Ft)

Efficiency (%)

BHP (HP)

Capacity (GPM)

Head (Ft)

Efficiency (%)

BHP (HP)

0.00 84.46 -0.05 4.25 0.00 59.55 -0.16 2.86 0.00 39.24 -0.10 1.75

54.17 84.57 25.83 4.48 45.83 59.76 24.24 2.85 37.50 39.31 20.80 1.79108.33 84.75 44.23 5.24 100.00 59.74 44.25 3.40 75.00 39.14 37.46 1.98189.58 84.13 62.21 6.47 160.42 59.05 58.87 4.06 131.25 38.31 55.31 2.30216.67 83.51 66.36 6.88 200.00 58.00 65.04 4.50 150.00 37.84 59.56 2.41270.83 81.45 72.60 7.67 252.08 55.80 70.45 5.04 206.25 35.64 67.94 2.73325.00 78.17 76.49 8.39 300.00 52.76 73.03 5.47 225.00 34.60 69.40 2.83433.33 67.71 77.92 9.51 343.75 49.07 73.63 5.78 281.25 30.36 70.07 3.08406.25 70.82 78.38 9.27 400.00 42.84 71.44 6.05 300.00 28.54 69.01 3.13487.50 60.54 75.20 9.91 458.33 34.60 64.85 6.18 375.00 19.10 56.70 3.19541.67 52.15 69.85 10.21 500.00 27.43 56.08 6.17 412.50 13.14 43.96 3.11650.00 32.11 50.10 10.52 550.00 17.43 39.85 6.07 450.00 6.49 24.71 2.99

KS Model 4009 Test Data at 1760 RPMPump Curves

8.00" Diameter

Capacity (GPM) Head (Ft) Efficiency (%) BHP (HP)

0.00 59.55 -0.16 2.86

100.00 59.74 44.25 3.40

200.00 58.00 65.04 4.50

300.00 52.76 73.03 5.47

400.00 42.84 71.44 6.05

500.00 27.43 56.08 6.17

Pump Curves

KS Model 4009 Test Data at 1760 RPM

8.00" Diameter

Capacity (GPM)

Head (Ft)

Efficiency (%)

BHP (HP)

0.00 59.55 -0.16 2.86100.00 59.74 44.25 3.40200.00 58.00 65.04 4.50300.00 52.76 73.03 5.47400.00 42.84 71.44 6.05500.00 27.43 56.08 6.17

KS Model 4009

Test Data at 1760 RPM

0 100 200 300 400 5000

10

20

30

40

50

60

70Pump Curve

Flow (Q) in GPM

He

ad

(H

) in

Fe

et

Pump Curves

Pump System

Capacity (GPM)

Head (Ft)Efficiency

(%)BHP (HP)

Head (Ft)

0.00 59.55 -0.16 2.86 0100.00 59.74 44.25 3.40 6.91200.00 58.00 65.04 4.50 24.91300.00 52.76 73.03 5.47 52.76400.00 42.84 71.44 6.05 89.83500.00 27.43 56.08 6.17 135.74

KS Model 4009

With an 8.00” impeller

Test Data at 1760 RPM

Pump Curves

SelfSensing Pumps

SelfSensing Pumps vs. Sensors

Correct Sensor Location

Resulting System Performance

Shaded area represents energy savings compared to constant speed pumps

( VFD. SET AT 60. HZ.)

GPMFM\FLOW FT\HEAD H.P.

0.000 56.833 2.6674.055 56.600 3.19144.206 56.516 3.94220.416 55.522 4.80286.850 53.348 5.46360.737 49.545 6.10

( VFD. SET AT 40. HZ.)

GPMFM\FLOW FT\HEAD H.P.

0.000 25.090 0.8548.511 24.959 0.9996.347 24.887 1.23

143.507 24.500 1.47193.075 23.391 1.68240.515 21.753 1.86

( VFD . SET AT 20. HZ)

GPMFM\FLOW FT\HEAD H.P.

0.000 5.962 0.1625.477 5.934 0.1848.194 5.921 0.2171.406 5.872 0.2496.522 5.624 0.27119.514 5.245 0.29

SelfSensing PumpsKS Model 4007

With 7.5 horsepower motor and VFD

With a 7.50” diameter impeller

Test data displayed below

Each pump goes through a complete data collection process

The data points are plotted to create pump curves at various speeds

SelfSensing Pumps

The SelfSensing pump operates anywhere in the dark grey area of the graph

SelfSensing Pumps

SelfSensing Pumps

3-Way Valve

Variable Flow

Constant Flow

0 50 100 150 200 250 300 350 400 4500

10

20

30

40

50

60

70

80

90

100

Flow (GPM)

Hea

d (

Ft.

)

SelfSensing Pumps

Valves Open Maximum Flow

Valves Closed Minimum Flow

0 50 100 150 200 250 300 350 400 4500

10

20

30

40

50

60

70

80

90

100

Flow (GPM)

Hea

d (

Ft.

)

Valves Open Maximum Flow

Valves Closed Minimum Flow

60 Hz50 Hz40 Hz30 Hz20 Hz

SelfSensing Pumps

0 50 100 150 200 250 300 350 400 4500

10

20

30

40

50

60

70

80

90

100

Flow (GPM)

Hea

d (

Ft.

)

SelfSensing Pumps

60 Hz

20 Hz

Valves Open Maximum Flow

Valves Closed Minimum Flow

Control Curve

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)

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)

0 50 100 150 200 250 300 350 400 4500

10

20

30

40

50

60

70

80

90

100

Flow (GPM)

Hea

d (

Ft.

)

Valves Open Maximum Flow

Valves Closed Minimum Flow

Constant Flow

SelfSensing Pumps

60 Hz

20 Hz

0 50 100 150 200 250 300 350 400 4500

10

20

30

40

50

60

70

80

90

100

Flow (GPM)

Hea

d (

Ft.

)

SelfSensing Pumps

60 Hz

20 Hz

Valves Open Maximum Flow

Valves Closed Minimum Flow

Constant Pressure

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 head on the selection wizard and specify the desired value on your order

Control Head

Control Head Adjustment

SelfSensing vs. Sensors

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.

SelfSensing Pumps vs. Sensors

Incorrect Sensor Location

Resulting System Performance

Shaded area represents energy savings compared to constant speed pumps

SelfSensing Pumps vs. Sensors

Correct Sensor Location

Resulting System Performance

Shaded area represents energy savings compared to constant speed pumps

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.

0 50 100 150 200 250 300 350 400 4500

10

20

30

40

50

60

70

80

90

100

Flow (GPM)

He

ad

(F

t.)

Design Operating Point

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?

SelfSensing Pumps vs. Sensors