Mixed theoretical and discrete sensorless converter for pump differential pressure and flow monitoring

Patent metadata

Field	Value
Publication number	US-9611856-B2
Application number	US-201414187817-A
Country	US
Kind code	B2
Filing date	Feb 24, 2014
Priority date	Dec 30, 2010
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

Abstract

The present invention provides apparatus featuring a signal processor or processing module that may be configured at least to: process signaling containing information about an equilibrium point of pump differential pressure and system pressure formulated in a hydronic domain by utilizing pump and system characteristic curve equations so as to yield system pressure and flow rate at any particular load and time in a pump hydronic system, including using a multi-dimensional sensorless conversion technique; and determine equivalent hydronic system characteristics associated with the pump differential pressure and flow rate to their corresponding motor power and speed reconstructed and remapped by using a discrete numerical approach, based at least partly on the signaling received. The signal processor or processing module may provide corresponding signaling containing information about the system pumping flow rate and pressure determined.

First claim

What we claim is:

1. Apparatus comprising:
a signal processor or processing module configured at least to:
process signaling containing information about an equilibrium point of pump differential pressure and system pressure formulated in a hydronic domain by utilizing pump and system characteristic curve equations so as to yield system pressure and flow rate at any particular load and time in a pump hydronic system, including using a multi-dimensional sensorless conversion technique; and
determine corresponding signaling containing information about equivalent hydronic system characteristics associated with the pump differential pressure and flow rate to their corresponding motor power and speed reconstructed and remapped by using a discrete numerical approach, based at least partly on the signaling processed, the signal processor or processing module configured to use an equivalent hydronic system characteristics curve equation that includes a flow equation of C v =Q/√{square root over (P)}, or at least some of its approximations.

2. Apparatus according to claim 1 , wherein the signal processor or processing module is configured to provide the corresponding signaling containing information about the equivalent hydronic system characteristics determined, including the pump differential pressure and flow rate for monitoring.

3. Apparatus according to claim 2 , wherein the corresponding signaling contains information used to control the pumping hydronic system.

4. Apparatus according to claim 3 , wherein the corresponding signaling is provided for systems flow regulation that includes manual or automatic control valves, manual or automatic control circulators, or their combinations.

5. Apparatus according to claim 1 , wherein the signal processor or processing module is configured to receive motor power and speed readout signaling containing information about motor power and speed and convert the equivalent hydronic system characteristics from the motor power and speed readout signaling received.

6. Apparatus according to claim 1 , wherein the signal processor or processing module is configured to balance the pump differential pressure and flow rate at the equilibrium point of a pump differential pressure curve at a given speed with the equivalent hydronic system characteristics at a given load.

7. Apparatus according to claim 1 , wherein the signal processor or processing module is configured to use a pump curve equation based at least partly on a pump curve model which was developed based upon a pump characteristic equation at any motor speed and system flow rate which may be represented approximately by a polynomial function of P=f p (Q,n) based upon a full speed characteristics curve and affinity laws.

8. Apparatus according to claim 7 , wherein the polynomial function includes a second order polynomial function of

P
=

P
so

⁡

(

n

n
max

)

2

+

P
d

·

P
so

Q
d
2

⁢
Q

,

(
1
)

where P so is a pump shutoff pressure at motor full speed, and P d and Q d are a pump pressure and a flow rate at a duty point.

9. Apparatus according to claim 7 , wherein the polynomial function includes a third or a fourth order polynomial function to represent the pump curve equation.

10. Apparatus according to claim 9 , wherein the signal processor or processing module is configured to re-derive the pump curve equation accordingly.

11. Apparatus according to claim 1 , wherein the signal processor or processing module is configured to determine a pressure equilibrium point that includes an intersection of a pump curve as well as a system curve.

12. Apparatus according to claim 11 , wherein the pressure equilibrium point for the system pressure and flow rate at any motor speed and power is based at least partly on a second order pump curve approximation.

13. Apparatus according to claim 1 , wherein the signal processor or processing module is configured to use a discrete conversion to an equivalent system characteristics coefficient from the corresponding motor power and speed that includes an inversely remapped discrete function of ŵ from a motor power distribution of W with respect to motor speed and an equivalent system curve based upon corresponding calibration pump and motor data plotted.

14. Apparatus according to claim 1 , wherein the signal processor or processing module is configured to use a discrete conversion of remapping and reconstruction that includes one or more 3D discrete numerical remapping methods, including 2D interpolations or 2D Splines.

15. Apparatus according to claim 1 , wherein the signal processor or processing module is configured to use a discrete conversion of remapping and reconstruction that includes one or more 2D or 3D discrete or numerical inversion methods, including 1D or 2D direct inversion, minimizations or simplex.

16. Apparatus according to claim 1 , wherein the signal processor or processing module is configured to use for the pumping hydronic system one or more close loop or open loop hydronic pumping systems, including primary pumping systems, secondary pumping systems, water circulating systems, and pressure booster systems.

17. Apparatus according to claim 16 , wherein the pumping hydronic system includes a single zone or multiple zones.

18. Apparatus according to claim 1 , wherein the signal processor or processing module is configured to use pump calibration data for a close loop hydronic system that includes pump differential pressure and flow rate data.

19. Apparatus according to claim 18 , wherein the pump calibration data includes either system pressure data or pump discharge section pressure and corresponding flow rate data.

20. Apparatus according to claim 1 , wherein the signal pr

Assignees

• Fluid Handling Llc
• Fluid Handling Llc

Inventors

• Cheng Andrew A
• Scott Graham A
• Gu James J

Classifications

• F04D15/0088

  Testing machines · CPC title

• F04D15/0066 Primary

  by changing the speed, e.g. of the driving engine · CPC title