Controlled hydronic distribution system
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Solution Overview
Problem
Conventional hydronic distribution systems control pump speed based on high set-point pressure to handle worst-case conditions, leading to excessive energy use and loss of process fluid energy under normal operating conditions.
Innovation Solution
A microprocessor-controlled system that networks self-regulating valves to share temperature and position information, processing this data to determine the optimal speed for variable speed pumps, ensuring efficient fluid flow and energy use by adjusting pump speed based on real-time valve positions and demands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high set-point pressure control is used to handle worst-case conditions, then system reliability is improved, but energy consumption increases
Solution Approach 1:
The patent implements dynamic pressure set-point adjustment based on real-time valve positions. The controller continuously monitors valve positions and dynamically modifies the pressure set-point to match current system demands, transitioning from static high set-point control to adaptive dynamic control that maintains reliability while reducing energy consumption during normal operations
Solution Approach 2:
The system incorporates feedback mechanisms where valve position information is fed back to the controller, which then adjusts the pressure set-point accordingly. This closed-loop feedback enables the system to respond to changing conditions and optimize energy usage while maintaining necessary pressure levels for system reliability
2Reliability
If high set-point pressure is maintained to ensure adequate fluid flow, then fluid flow reliability is improved, but process fluid energy loss increases
Solution Approach 1:
The pressure set-point is dynamically adjusted based on actual valve positions rather than maintaining a constant high value. This dynamic adaptation ensures adequate fluid flow reliability when needed while minimizing unnecessary pressure maintenance that would cause energy loss during normal operating conditions
Solution Approach 2:
The system changes the pressure parameter (set-point) based on operating conditions and valve positions. By modifying this critical parameter dynamically, the system maintains fluid flow reliability when required while reducing energy loss by avoiding excessive pressure maintenance during normal operations
3Productivity
If variable speed pumps operate at high speed to meet worst-case demand, then productivity is improved, but energy consumption increases
Solution Approach 1:
Pump speed is dynamically controlled based on real-time valve position feedback. The system adjusts pump speed to match actual system demand rather than operating continuously at high speed, maintaining productivity when needed while significantly reducing energy consumption during normal operations
Solution Approach 2:
Valve position information serves as feedback to the controller, which adjusts pump speed accordingly. This feedback mechanism enables the system to maintain productivity by ensuring adequate flow capacity while optimizing energy consumption by matching pump speed to actual demand conditions
Data Source
AI summary
A hydronic distribution system includes self-regulating valves networked together and operable to share valve temperature and valve position information with a microprocessor or other type of controller. The microprocessor runs one or more algorithms that process the temperatures and positions of the valves and then computes a desired speed for one or more variable speed pumps within the system. Controlling the pumps to operate at the desired speed and still maintain the correct amount of process fluid flow needed by the system reduces the overall energy use of the hydronic distribution system, saves on the operational lives of the pumps, and increases system efficiency.