Circulation Pump Control Curve Adaptation for Heating Efficiency
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Solution Overview
Problem
Existing heating circulation pumps often operate inefficiently due to unknown or inaccurately estimated real minimal system characteristics, leading to energy wastage and potential undersupply of heat.
Innovation Solution
A procedure for regulating a circulation pump by dynamically determining an expected minimal system characteristic during operation, allowing the pump to adjust its speed curve accordingly to optimize energy efficiency and prevent undersupply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control curve is set significantly above the estimated minimum system characteristic curve to ensure adequate power buffer, then heat supply reliability is improved, but energy consumption increases due to excess power
Solution Approach 1:
The pump controller continuously monitors the actual flow rate and head values during operation, compares them with the estimated minimum system characteristic curve, and automatically adjusts the control curve parameters. This feedback mechanism allows the system to maintain adequate power buffer when needed while reducing energy consumption when the actual system characteristics differ from estimates, thereby resolving the contradiction between reliability and energy efficiency.
Solution Approach 2:
The control curve is transformed from a static, pre-set parameter into a dynamic element that automatically adapts to actual system conditions. The pump controller continuously updates the control curve based on real-time measurements of flow rate and head, enabling the system to optimize the balance between power buffer and energy consumption according to actual operating conditions rather than relying on fixed estimates.
2Use of energy by moving object
If the control curve is set close to the estimated minimum system characteristic curve to optimize energy efficiency, then energy consumption is reduced, but heat supply reliability deteriorates due to potential undersupply
Solution Approach 1:
The system continuously monitors actual flow rate and head values and compares them against the control curve. When measurements indicate that the actual system characteristics differ from estimates (suggesting potential undersupply), the controller automatically adjusts the control curve parameters to restore adequate head and flow, ensuring reliability while maintaining energy efficiency. This feedback prevents undersupply conditions from developing.
Solution Approach 2:
The system maintains a dynamic safety margin by continuously adjusting the control curve based on real-time measurements. Rather than relying on fixed estimates that may be inaccurate, the controller proactively adapts the control curve to ensure adequate power buffer is maintained, cushioning against potential undersupply conditions before they occur while minimizing energy waste.
3Use of energy by moving object
If manual output adjustment is used to match peak demand, then energy efficiency is improved during peak periods, but the pump operates at inefficient levels during prolonged periods
Solution Approach 1:
The pump controller automatically performs the function of manual output adjustment by continuously monitoring actual system characteristics and self-adjusting the control curve parameters. This eliminates the need for manual intervention to match peak demand while maintaining energy efficiency, and the system handles prolonged periods of varying demand automatically without requiring operational changes, thus resolving both energy efficiency and ease of operation concerns.
Data Source
Figure 1
Figure 2a~2b
Figure 3a~3c
AI summary
The invention relates to a method for controlling a variable speed circulation pump in a hydraulic system, particularly in a heating system, comprising the method steps of adjusting the pump speed in dependence on a control curve, which is determined in dependence on an initial minimum system characteristic curve, determining a new minimum system characteristic curve during regular pump operation and adjusting the control curve to the newly determined minimum system characteristic curve.