Smart Valve Autonomous Control for Stable Air Handler Temperature
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Solution Overview
Problem
Conventional air handler units (AHUs) face challenges in maintaining stable air temperature control, often resulting in insufficient heating or cooling, potential freezing conditions, and energy inefficiencies due to the need for complex and time-consuming tuning of smart valves and building automation systems (BAS).
Innovation Solution
The implementation of smart valves with integrated air and water temperature sensors and processors that allow for multivariable control, enabling independent modulation of water flow through coils based on temperature setpoints and real-time data, reducing the reliance on BAS for precise and stable temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional smart valves are used with BAS for temperature control, then the system can provide heating and cooling functions, but the system requires complex tuning and programming which increases device complexity and installation time
Solution Approach 1:
The smart valve is equipped with an integrated processor that autonomously performs multivariable control calculations using temperature setpoints and real-time sensor data from air and water temperature sensors. This self-service capability eliminates the need for external BAS programming and complex tuning, as the valve independently modulates water flow to achieve precise temperature control
Solution Approach 2:
The patent combines multiple control functions including temperature sensing, flow modulation, and control logic processing into a single integrated smart valve assembly. This merging of previously separate components (valve actuator, sensors, and control processor) simplifies the overall system architecture and reduces installation complexity
2Extent of automation
If conventional smart valves rely on BAS for control, then centralized control is achieved, but the system experiences instability and temperature fluctuations due to complex control loops
Solution Approach 1:
The smart valve incorporates real-time feedback from both air temperature sensors (measuring downstream air temperature) and water temperature sensors (measuring supply and return water temperatures). The processor continuously compares actual temperatures with setpoints and dynamically adjusts valve position to maintain stable air temperature, eliminating the instability issues associated with complex centralized control loops
Solution Approach 2:
The control function is segmented from the centralized BAS to the individual smart valve level. Each valve operates as an independent control unit with its own processor and sensors, managing its own temperature control locally. This segmentation eliminates the instability caused by complex interconnected control loops in centralized systems
3Measurement precision
If extensive programming and tuning is performed on conventional smart valves, then precise temperature control is achieved, but the installation time and energy inefficiency increase
Solution Approach 1:
The smart valve's integrated processor automatically performs the tuning and programming functions that previously required extensive manual configuration. The valve self-configures by receiving temperature setpoints and using real-time feedback from sensors to autonomously optimize its control parameters, eliminating time-consuming installation procedures while maintaining precise temperature control
4Device complexity
If conventional smart valves are used without integrated sensors, then the valve structure is simpler, but the system requires additional sensors and wiring which increases device complexity
Solution Approach 1:
The patent integrates air temperature sensors, water temperature sensors, and the control processor directly into the smart valve assembly. This merging of sensing and control functions into a single integrated unit eliminates the need for separate sensors and wiring connections, maintaining structural simplicity while enabling advanced multivariable control capabilities
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the accuracy and stability of air temperature control in AHUs, reduces the need for extensive programming and tuning, and improves energy efficiency by allowing smart valves to adjust valve positions autonomously based on real-time temperature data, thereby minimizing energy wastage and temperature fluctuations.
Implementation Method 1
coils (e.g., heat exchanger coils or cooling coils) located to interact with the AHU's air flow
Implementation Method 2
AHUs include fans or blowers that move the air flow over and/or through the coils
Data Source
AI summary
An air handler unit (AHU) in communication with a building automation system (BAS) or through direct programming of one or more smart valves within the AHU operates to meter an amount of water that flows through a coil in the AHU. In one embodiment, the BAS transmits a temperature setpoint signal to the smart valve and allows the smart valve to control its valve position without additional input from the BAS. In another embodiment, the AHU includes a master smart valve and a second valve. The BAS provides the temperature setpoint signal to the master smart valve, which in turn provides another temperature setpoint signal to the second valve. The second valve may take the form of a slave smart valve or a slave non-smart valve.