Maximum flow setting
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Solution Overview
Problem
HVAC installations face challenges in maintaining adequate flow through heat exchangers due to varying hydraulic resistances over time, leading to inadequate or incorrect flow rates, which can result in inefficiency and wear on valve components.
Innovation Solution
A control algorithm that calculates a dynamic maximum flow setting by averaging flow rate signals, applying scale and minimum filters, and using a maximum filter with adjustable trigger intervals and window lengths to determine a bounded flow rate, which can be implemented locally or remotely, allowing for user input and adaptation to specific needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a default flow rate is used to determine valve positions, then the system can operate after the design stage, but the flow rate becomes inadequate because hydraulic resistances change over time
Solution Approach 1:
The system continuously monitors actual flow rates through flow sensors and uses this feedback to dynamically adjust valve positions. The controller compares measured flow rates with target flow rates and automatically modifies valve opening degrees to maintain optimal performance despite changing hydraulic resistances over time
Solution Approach 2:
The valve positions are transformed from static default values to dynamic adjustable parameters. The system continuously adapts valve openings based on real-time flow measurements and changing system conditions, enabling the HVAC installation to maintain optimal performance throughout its operational lifecycle
2Adaptability or versatility
If hydraulic resistances vary throughout operation, then the system can adapt to different conditions, but flow in heat exchangers becomes inadequate and incorrect over time
Solution Approach 1:
Flow sensors continuously measure actual flow rates through heat exchangers and provide feedback to the controller. The controller uses this information to detect deviations from target flow rates and automatically adjusts valve positions to maintain reliable and adequate flow despite varying hydraulic resistances
Solution Approach 2:
The system performs self-adjustment by automatically modifying valve positions based on measured flow conditions. This eliminates the need for manual rebalancing and enables the system to maintain optimal flow distribution autonomously throughout operation
3Device complexity
If flow rates are not dynamically adjusted, then the system structure remains simple, but energy waste and wear on valve components increase
Solution Approach 1:
The system uses flow sensors to continuously monitor actual flow rates and provides feedback to the controller. This enables automatic adjustment of valve positions to optimize flow distribution, reducing energy waste from both inadequate flow and excessive flow conditions while maintaining manageable system complexity
Solution Approach 2:
The system dynamically changes valve opening parameters based on measured flow conditions. By continuously adjusting valve positions to maintain optimal flow rates, the system reduces energy consumption and prevents wear on valve components without requiring complex additional hardware
Data Source
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AI summary
Maximum flow setting. A method of limiting flow through a valve (1) comprising: reading a time series of signals from a flow sensor (5a, 5b); producing a time series of flow rates from the time series of signals; producing an averaged series of values; producing a first bounded series of values by replacing values that are below a lower threshold (13) with the lower threshold (13); producing a second bounded series of values by replacing values that exceed an upper threshold (15) with values that equal the upper threshold (15); producing a maximum flow rate by applying a moving maximum filter (17) to the second bounded series; reading a set point signal (9); limiting the set point signal (9) to the maximum flow rate; producing an actuation signal from the limited set point signal; transmitting the actuation signal to an actuator (7).