Variable-Speed Circulation Pump Control for Heating Systems
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Solution Overview
Problem
Existing circulation pumps in heating systems, especially those with low or medium output, often operate in energetically unfavorable modes due to unregulated performance and uncertainty in the minimum system characteristic curve, leading to potential undersupply and inefficiency.
Innovation Solution
A method that initially uses a static control characteristic curve and switches to a dynamic control characteristic curve during stable operation to reduce energy consumption, with the pump speed being gradually reduced and thermostatic valves adjusting to maintain constant flow, reverting to static control if flow limits are breached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a proportional or parabolic control characteristic curve is used to ensure sufficient power cushion, then the system reliability is improved, but the energy consumption increases due to excess pump performance
Solution Approach 1:
The patent applies dynamics by switching from a static control characteristic curve to a dynamic control characteristic curve that continuously adapts to current system conditions. The control characteristic is dynamically adjusted based on real-time monitoring of system parameters, allowing the pump to operate closer to the minimum system characteristic curve while maintaining reliable supply through continuous adaptation rather than fixed conservative margins.
2Use of energy by moving object
If the pump speed is reduced to save energy, then the energy consumption decreases, but the risk of temporary undersupply increases
Solution Approach 1:
The patent implements feedback by continuously monitoring system parameters and using this information to adjust the control characteristic curve. The control system receives feedback about actual system conditions and dynamically modifies the pump operation accordingly, enabling energy reduction while preventing undersupply through real-time adaptive response to changing system demands.
3Use of energy by moving object
If a learning algorithm is used to adapt the control characteristic curve, then the energy efficiency improves, but the device complexity increases due to complex software and hardware requirements
Solution Approach 1:
The patent applies parameter changes by modifying the control characteristic curve parameters based on monitored system conditions rather than using complex learning algorithms. The control system adjusts operational parameters dynamically according to observed system behavior, achieving energy efficiency through parameter adaptation with simpler computational requirements compared to machine learning approaches.
Data Source
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AI summary
The invention relates to a method for controlling a circulation pump having variable rotational speed in a hydraulic system, in particular in a heating system. The method provides for control of the rotational speed of the circulation pump in accordance with a stored static control characteristic curve and switches over the pump operation to a dynamic control characteristic curve when a steady operating point of the hydraulic system is detected. The invention further relates to a circulation pump having a controller for carrying out the method according to the invention.