Fluid control measuring device
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Solution Overview
Problem
Current fluid flow measurement devices are expensive and have limited turndown ratios, making them ineffective for accurately measuring low fluid flows, particularly in HVAC systems, leading to energy inefficiency and reduced comfort due to the need to turn systems on or off.
Innovation Solution
A flow measurement and control system utilizing a multi-stage damper with a variable orifice plate and an actuator assembly, coupled with a controller that determines pressure differentials and adjusts the opening area to achieve a high turndown ratio, enabling precise measurement and control of fluid flows across a wide range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional flow measurement devices are used, then measurement capability is provided, but cost is prohibitive and turndown ratio is limited
Solution Approach 1:
The flow control device is segmented into multiple independent dampers (first damper, second damper, third damper) that can operate independently or in combination. Each damper handles a specific flow range, allowing the system to achieve high measurement precision across a wide turndown ratio while using simpler, less expensive individual components rather than a single complex expensive device.
Solution Approach 2:
The dampers are arranged in a nested configuration where the second damper is positioned within the flow path of the first damper, and the third damper is positioned within the flow path of the second damper. This nesting allows compact arrangement of multiple control elements and enables the system to achieve high turndown ratio (100:1 or greater) by combining the flow control capabilities of multiple simpler dampers rather than requiring a single complex device.
2Adaptability or versatility
If conventional flow measurement devices are used, then measurement is possible, but turndown ratio is limited to less than 10:1
Solution Approach 1:
The flow measurement range is segmented into multiple zones handled by different dampers. The first damper handles high flow ranges, the second damper handles medium flow ranges, and the third damper handles low flow ranges. This segmentation allows the system to achieve a turndown ratio of 100:1 or greater while maintaining measurement precision in each specific range through the use of appropriately sized dampers.
Solution Approach 2:
The system dynamically switches between different damper configurations based on the required flow range. The dampers can be independently adjusted and combined in different ways to match the operating conditions, allowing the system to adapt to a wide range of flow rates while maintaining accuracy. This dynamic capability enables the system to achieve high turndown ratio without sacrificing measurement precision.
3Ease of operation
If HVAC systems are turned on or off due to limited measurement capability, then system simplicity is maintained, but energy consumption increases and comfort is reduced
Solution Approach 1:
The multi-damper system enables continuous dynamic adjustment of HVAC system operation across a wide range of flow rates. Instead of simple on/off control, the dampers can be positioned to match actual demand conditions, allowing the system to operate efficiently at partial loads. This dynamic control capability reduces energy consumption while maintaining system operational simplicity and improving occupant comfort through precise flow regulation.
Solution Approach 2:
The system changes operational parameters by adjusting damper positions to match varying flow demands. The multiple dampers provide fine-grained control over flow parameters, allowing the HVAC system to operate efficiently across different load conditions without requiring complex control logic. This parameter adjustment capability enables energy reduction while maintaining ease of operation and improving comfort through continuous rather than binary control.
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
The system allows for accurate measurement and regulation of fluid flows with a high turndown ratio, reducing energy consumption and improving comfort by enabling precise control of HVAC systems, while being economically viable.
Implementation Method 1
a first sensor disposed in the flow pathway upstream of the orifice plate... determine a pressure differential based on a first pressure measurement obtained by the first sensor
Data Source
AI summary
Systems and methods for measuring and controlling fluid flow include an orifice plate defining a variable opening. The orifice plate includes an outer assembly comprising a central opening and an inner assembly extending through the central opening. The flow device regulates high and very low volumes of fluid with precision, inexpensively, with superior acoustics, reduced energy, and simpler design. The high turndown device permits use at lower velocities, thereby reducing noise generation and eliminating need for sound-attenuating liners. The high rangeability device combines several part numbers into fewer parts, thereby streamlining product portfolios. In some cases, cost benefits associated with the flow device allow equipment to be scaled back 100:1 rather than 10:1, providing energy savings, fewer product variations, simple and more robust applications. The device meets new and old building fresh air, comfort and energy codes. The flow device can be engineered, selected, and sized without sophisticated software programs.