Sensorless Adaptive Pump Control for Hydronic Heating Energy Savings
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Solution Overview
Problem
Conventional hydronic heating and cooling systems experience significant energy waste due to flow dynamic friction and thermal energy loss in bypass pipelines, with existing variable speed pump controls being dependent on unknown system design values and varying flow rates.
Innovation Solution
A system and flow adaptive control technique that adjusts pump speeds based on real-time system characteristics and moving maximum flow rates, using a signal processor to determine desired pump speeds and implement a PID control for minimum energy operation, even in sensorless applications.
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 through bypass pipelines and valves
Solution Approach 1:
The patent implements variable speed pump control that dynamically adjusts pump operation based on real-time system conditions. The controller receives signals about actual flow rates and system pressure, then continuously modifies pump speed to match actual demand, eliminating the need for constant pumping and reducing energy waste through bypass pipelines.
Solution Approach 2:
The system employs feedback control where the controller receives signaling containing information about actual flow rates from the hydronic system. This feedback loop allows the controller to compare actual performance with desired performance and adjust pump speed accordingly, optimizing energy efficiency while maintaining system stability.
2Loss of energy
If variable speed pump controls with linear or quadratic curve control are used, then energy savings can be achieved, but the control effectiveness depends on unknown system design values and varying flow rates
Solution Approach 1:
The controller receives real-time signaling about actual flow rates from the hydronic system and uses this feedback to dynamically adjust pump speed. This closed-loop control eliminates dependence on unknown design values by continuously adapting to actual system conditions, ensuring optimal energy savings across varying flow rates and temperature settings.
Solution Approach 2:
The system performs self-adjustment by using its own operational data (actual flow rates and system pressure) to control its own pump speed. The controller automatically adapts to changing conditions without requiring external intervention or pre-programmed design values, making the energy savings effective across diverse operating scenarios.
3Productivity
If pump speed is increased to meet peak flow demands, then sufficient flow rate can be provided to all zones, but energy consumption increases significantly
Solution Approach 1:
The pump speed is dynamically adjusted based on real-time feedback about actual flow rate demands from various zones. Rather than operating at constant high speed to meet peak demands, the system varies pump speed to match actual instantaneous requirements, maintaining sufficient flow delivery while minimizing energy consumption during lower demand periods.
Solution Approach 2:
The system changes the operational parameters of the pump (speed, flow rate, pressure) based on actual system conditions and demand signals. By continuously adjusting these parameters to match real-time requirements rather than operating at fixed settings, the system maintains productivity while optimizing energy usage across different operating conditions.
Data Source
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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.