Hydronic Manifold Valve Timing to Prevent Pressure and Noise Spikes
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Solution Overview
Problem
Hydronic heating/cooling systems face complexity in controlling actuator valves, leading to acoustic and hydraulic issues due to simultaneous valve closures, which affect system reliability and temperature control.
Innovation Solution
Implementing actuators with fast operating times and a control system that prevents simultaneous closure of valves in different heating loops by introducing delays in the duty cycles, ensuring valves close at different times to mitigate hydraulic and acoustic problems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If actuators with fast operating times are used for controlling valves in heating loops, then control versatility and response speed are improved, but hydraulic impacts and acoustic noise increase due to simultaneous valve closures
Solution Approach 1:
The control system detects duty cycle endings in advance and proactively schedules valve closures to occur at different times. By predicting when multiple valves would close simultaneously and preemptively adjusting their closure timing, the system prevents hydraulic impacts and acoustic noise before they occur, while still utilizing fast actuators for responsive control.
2Object-affected harmful factors
If valves in different heating loops are controlled to close at different times, then hydraulic impacts and acoustic noise are reduced, but control complexity increases
Solution Approach 1:
The control system continuously monitors the operational state of all actuators and duty cycle timings. Based on this feedback, the controller dynamically adjusts valve closure schedules to prevent simultaneous closures. This feedback mechanism enables the system to manage the complexity of coordinating multiple valves while maintaining effective reduction of hydraulic impacts and acoustic noise.
3Reliability
If simultaneous closure of actuator valves in different heating loops is prevented, then system reliability and temperature control are enhanced, but productivity and response time may be reduced
Solution Approach 1:
The system applies selective timing adjustments only to the specific valves that would close simultaneously, rather than delaying all valve operations uniformly. This partial action approach maintains overall system productivity by allowing most valves to operate at full speed while introducing minimal, targeted delays only where necessary to prevent simultaneous closures and maintain reliability.
Data Source
Figure 1~3
Figure 4
AI summary
In a hydronic heating/cooling system, liquid is led along a main supply pipe (1 ) to a supply manifold (2) and distributed into heating loops (3). The heating loops (3) return to a return manifold (4). At least one of the manifolds (2, 4) has actuators (6) for controlling the flow in the heating loops (3). Actuators with fast operating times are used and valves of the actuators are controlled too close at different times in different heating loops (3).