Adaptive Sensorless Pump Control for Hydronic System Energy Efficiency
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Solution Overview
Problem
Conventional hydronic pumping systems experience significant energy waste due to flow dynamic friction and thermal energy loss, with existing energy-saving control methods being dependent on unknown system design values and varying flow rates.
Innovation Solution
A system and flow adaptive control technique that uses a signal processor to derive an adaptive pressure set point and determine desired pump speeds based on an adaptive system and flow control curve equation, incorporating sensorless applications to optimize pumping energy usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional constant pumping is used in hydronic heating systems, then the system can maintain stable operation, but significant energy waste occurs due to flow dynamic friction and thermal energy loss in bypass pipelines
Solution Approach 1:
The patent implements dynamic pump speed control that adjusts the pump's operating parameters in real-time based on actual system conditions. The controller continuously monitors system pressure and flow rate, and dynamically adjusts the pump speed to match the actual heating/cooling load requirements, eliminating the need for constant pumping and reducing energy waste in bypass pipelines.
Solution Approach 2:
The patent changes the operating parameters of the pump from fixed constant values to variable values that adapt to system conditions. By modifying pressure set points and flow rates dynamically, the system optimizes energy efficiency while maintaining stable operation. The controller adjusts these parameters based on actual load requirements, eliminating excessive energy consumption.
2Loss of energy
If variable speed pump control with fixed control curves is used, then energy saving can be achieved, but the control effectiveness is limited due to dependence on unknown system design values and varying flow rates
Solution Approach 1:
The patent implements a feedback control system that continuously monitors actual system pressure and flow rate, and uses this information to adjust pump speed in real-time. The controller receives feedback from system sensors and dynamically adjusts operating parameters to match actual conditions, making the system adaptive to varying flow rates and temperature settings without relying on predetermined design values.
Solution Approach 2:
The patent employs dynamic control curves that adapt to changing system conditions rather than using fixed control curves. The control parameters are continuously adjusted based on real-time system state, enabling the system to maintain optimal energy efficiency across varying operating conditions including different flow rates, temperature settings, and weather conditions.
3Temperature
If three way valve controlled bypass system is used, then flow rate can be maintained for temperature setup, but energy loss occurs due to flow dynamic friction and water thermal energy loss in bypass lines
Solution Approach 1:
The patent extracts and eliminates the bypass system component that causes energy loss. Instead of using three-way valves to divert flow through bypass pipelines, the system directly controls pump speed to match the actual flow requirements of the heating/cooling zones, removing the source of dynamic friction losses and thermal energy waste in bypass lines.
Solution Approach 2:
The patent enables the pump control system to self-adjust based on actual system needs without requiring bypass mechanisms. The controller automatically adjusts pump speed to provide exactly the flow rate needed for the current temperature setup and load conditions, eliminating the need for energy-wasting bypass flow diversion.
Data Source
AI summary
A signal processor receives signaling containing information about flow rates from sensorless converters in zone circulators in heating/cooling zones controlled by temperature sensors in a hydronic heating system in order to derive an adaptive pressure set point to meet the flow rates requested by the heating/cooling zones using an adaptive system and flow control curve equation, the signaling containing information about total flow rates requested by the zone circulators; determines desired pump speeds for the zone circulators to meet temperature requirements in heat zones; provides corresponding signaling containing information about the desired pump speeds; and/or determines the adaptive pump control curve equation based upon an adaptive system curve and as a moving maximum system flow rate depending on an adaptive pressure set point, a system flow rate requested by temperature loads, a minimum pressure at no flow, a control curve setting parameter, and an adaptive moving maximum flow and pressure.