Pump Unit Speed Control for Energy-Optimized Liquid Transport
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Solution Overview
Problem
Current pump systems for liquid transport, particularly in wastewater pumping stations, operate inefficiently due to frequent on/off cycles and lack of optimal speed control, leading to high energy consumption and wear, with existing energy optimization methods only addressing current conditions and not providing long-term energy efficiency.
Innovation Solution
A method for energy-optimal operation of open pump systems using a speed-controllable pump unit, where the pump is operated at the speed that minimizes volume flow-specific energy consumption, determined by evaluating a mathematical function based on system characteristics, allowing for continuous energy-efficient operation unless extraordinary conditions require a different setting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the pump is operated with frequent on/off cycles based on two-point control, then the pump can be activated and deactivated depending on the level in the pump sump, but this leads to increased wear on the pump units and increased energy consumption
Solution Approach 1:
The patent applies dynamic speed control by continuously adjusting the pump's rotational speed based on real-time level measurements in the pump sump. Instead of static on/off switching, the pump operates dynamically at optimized speeds that adapt to varying operational conditions, thereby reducing energy consumption while minimizing wear through avoidance of frequent start-stop cycles
Solution Approach 2:
The invention changes the operational parameter from binary (on/off) to continuous (variable speed). By modifying the speed parameter n and calculating optimal operating points based on system characteristics, the pump transitions between different speed states smoothly, eliminating the harmful effects of frequent switching while maintaining operational simplicity through automated control
2Productivity
If the pump operates at high speeds to handle piece goods in the medium, then the pumping capacity increases, but this leads to high energy consumption that is not absolutely necessary
Solution Approach 1:
The system dynamically adjusts the pump speed based on actual operational requirements rather than maintaining constant high speed. The control unit continuously calculates the optimal speed n that satisfies the pumping requirement while minimizing energy consumption, allowing the pump to operate at lower speeds when piece goods are not present and only increase speed when necessary
Solution Approach 2:
The patent implements a feedback control mechanism where the actual pump performance and system conditions are continuously monitored. The control unit receives feedback about the operational state and adjusts the speed accordingly, ensuring that high speeds are only maintained when actually needed for handling piece goods, thereby optimizing the balance between productivity and energy consumption
3Use of energy by moving object
If existing energy optimization methods are used that only address current conditions, then the pump can be controlled for the current time, but this does not provide long-term energy efficiency
Solution Approach 1:
The system performs preliminary calculations of optimal operating points based on predicted future conditions and system characteristics. By pre-calculating and storing optimized speed profiles, the pump can follow predetermined energy-efficient trajectories, ensuring long-term energy efficiency rather than merely reacting to current conditions
Solution Approach 2:
The patent employs continuous feedback mechanisms that monitor both current operational parameters and accumulated performance data over time. This feedback loop enables the system to learn from past operations and continuously refine its energy optimization strategy, transitioning from short-term to long-term energy efficiency through adaptive control
Data Source
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AI summary
The invention relates to a method for the energy-optimized operation of an open pump system (1) for liquid transport, comprising at least one speed-controlled pump unit (2) that pumps the liquid from a container (3). Depending on at least one manufacturer-specified system characteristic curve (HA(Q,h)), the speed (nopt, n(Q, h), PQ(n, h)) at which the volume-flow-specific energy consumption (PQ(Q, h), PQ(n, h)) of the pump unit (2) is minimized is calculated by evaluating a mathematical function (Figs. 12a, 12b) that assigns the required volume-flow-specific energy consumption (PQ(Q, h), PQ(n, h)) to a given flow rate (Q). The pump unit (2) is then operated at this calculated optimal speed (nopt, n(Qopt, h)).