Variable speed multi-pump application for providing energy saving by calculating and compensating for friction loss using speed reference
First Claim
1. A pump system comprising:
- a constant pressure control model having a logic, comparator or proportional integral derivative (PID) controller and a pump model having one or more running pumps, the logic, comparator or PID controller configured to respond to set point signaling and provide speed signaling, the pump model configured to respond to the speed signaling and operate the one or more running pumps operating at a substantially constant discharge pressure; and
a pump system logic controller having a signal processor or processing module configured torespond to the speed signaling, and also to user input signaling containing information about a set point and a speed related to running the one or more pumps in the pump system, anddetermine the set point signaling containing information about an adjustment to the set point to compensate for system friction loss and maintain the substantially constant discharge pressure of the pump system for a flow variation using an interpolation based on a relationship between a minimum set point for a minimum speed and a maximum set point for a maximum speed so as to find a value of an adjusted set point for the speed in order to maintain the substantially constant discharge pressure of the pump system, in response to the speed signaling and the user input signaling received.
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Accused Products
Abstract
Apparatus features a signal processor or processing module configured to respond to signaling containing information about a set point and a speed related to one or more pumps in a pump system, e.g., including a variable speed multiple pump booster system, operating at a substantially constant discharge pressure; and determine an adjustment to the set point to compensate for system friction loss and maintain the substantially constant discharge pressure of the variable speed multiple pump booster system for flow variation, based at least partly on the signaling received. The signal processor or processing module 10a provides corresponding signaling containing information to control the one or more pumps in the variable speed multiple pump booster system.
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Citations
21 Claims
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1. A pump system comprising:
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a constant pressure control model having a logic, comparator or proportional integral derivative (PID) controller and a pump model having one or more running pumps, the logic, comparator or PID controller configured to respond to set point signaling and provide speed signaling, the pump model configured to respond to the speed signaling and operate the one or more running pumps operating at a substantially constant discharge pressure; and a pump system logic controller having a signal processor or processing module configured to respond to the speed signaling, and also to user input signaling containing information about a set point and a speed related to running the one or more pumps in the pump system, and determine the set point signaling containing information about an adjustment to the set point to compensate for system friction loss and maintain the substantially constant discharge pressure of the pump system for a flow variation using an interpolation based on a relationship between a minimum set point for a minimum speed and a maximum set point for a maximum speed so as to find a value of an adjusted set point for the speed in order to maintain the substantially constant discharge pressure of the pump system, in response to the speed signaling and the user input signaling received. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method comprising:
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responding, with a logic, comparator or proportional integral derivative (PID) controller in a constant pressure control model, to set point signaling and provide speed signaling, responding, with a pump model in the constant pressure control model, to the speed signaling and operating one or more running pumps in the pump model at a substantially constant discharge pressure; responding, with a signal processor or processing module in a pump system logic controller, to the speed signaling and also to user input signaling containing information about a set point and a speed related to running the one or more pumps in the pump system; and determining, with the signal processor or processing module, the set point signaling containing information about an adjustment to the set point to compensate for system friction loss and maintain the substantially constant discharge pressure of the pump system for flow variation using an interpolation based on a relationship between a minimum set point for a minimum speed and a maximum set point for a maximum speed so as to find a value of an adjusted set point for the speed in order to maintain the substantially constant discharge pressure of the pump system, based at least partly on the user input signaling and the speed signaling received. - View Dependent Claims (18, 19, 20, 21)
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Specification