Remote Flow-Reset Valve Actuator for HVAC Coil Freeze Prevention
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Solution Overview
Problem
Conventional fluid control systems for HVAC applications face challenges in efficiently managing flow rates, leading to inadequate energy efficiency, particularly in maintaining optimal temperature differentials and preventing coil freezing, due to limitations in remote adjustability and synchronization with building management systems.
Innovation Solution
A fluid control valve and actuator assembly with a communications module that allows remote monitoring and control, featuring adjustable maximum and minimum flow rates, integrated sensors, and an anti-cavitation module, enabling synchronization with building management systems and mechanical heating/cooling systems to optimize energy efficiency and prevent freezing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the minimum flow rate is increased to operate chillers and boilers at their most energy efficient inlet to outlet temperature differential, then energy efficiency of mechanical equipment is improved, but the risk of coil freezing increases due to reduced flow through the HVAC coil
Solution Approach 1:
The valve actuator dynamically adjusts the minimum flow rate based on system conditions and receives flow reset commands from the BMS to optimize chiller/boiler operation while preventing coil freezing. The system transitions from static flow control to dynamic flow control that adapts to varying operational requirements.
Solution Approach 2:
The BMS provides flow reset commands based on system-wide feedback regarding chiller and boiler operational efficiency. The valve actuator receives these commands and adjusts the minimum flow rate accordingly, creating a feedback loop that balances local coil protection with overall system energy efficiency.
2Use of energy by moving object
If the maximum flow rate is adjusted to allow adequate heat transfer time, then heat transfer efficiency is improved, but the ability to respond to changing HVAC demands is reduced
Solution Approach 1:
The valve actuator dynamically modulates the maximum flow rate based on real-time HVAC demands and receives remote adjustment commands from the BMS. This allows the system to optimize heat transfer efficiency under steady conditions while maintaining the ability to respond rapidly to changing thermal demands.
Solution Approach 2:
The system periodically receives flow reset commands from the BMS to adjust maximum flow rates based on seasonal changes, equipment degradation, and varying operational requirements. This periodic adjustment maintains optimal heat transfer efficiency while adapting to changing conditions.
3Device complexity
If local control mechanisms are used for flow rate adjustment, then system simplicity is maintained, but remote monitoring and optimization capabilities are lost
Solution Approach 1:
The valve actuator serves multiple functions: it performs local flow control while simultaneously providing remote monitoring and receiving remote adjustment commands from the BMS. This multi-functionality allows the system to maintain operational simplicity at the valve level while enabling centralized monitoring and optimization.
Solution Approach 2:
The communications module acts as an intermediary between the local valve actuator and the remote BMS. It enables bidirectional communication for monitoring and control without complicating the local valve operation, allowing centralized management while preserving local system simplicity.
4Reliability
If fixed flow rates are used to ensure reliable operation, then system reliability is improved, but energy efficiency optimization is reduced
Solution Approach 1:
The valve actuator maintains reliable operation by dynamically adjusting flow rates based on BMS commands and system conditions. Rather than using fixed flow rates, the system adapts flow settings to optimize energy efficiency while maintaining operational reliability through controlled variability.
Solution Approach 2:
The system changes flow rate parameters remotely via BMS commands to optimize energy efficiency. The valve actuator receives and implements parameter changes for both minimum and maximum flow rates, allowing the system to maintain reliability while adapting to varying energy efficiency requirements.
Data Source
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Figure 5A
AI summary
An fluid control valve and actuator assembly includes a valve configured to control a flow of liquid, and a valve actuator configured to control opening and closing of the valve, and further configured to provide both a maximum flow rate and a minimum flow rate of the liquid through the valve. In a particular embodiment, the valve actuator has a communications module configured to facilitate communication with the valve actuator over a network, and further configured to allow both remote monitoring of the flow through the valve, and remote control of the valve actuator.