Heated Valve Sensing for Fluid Classification and Flow Rate
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Solution Overview
Problem
Existing heating, ventilation, and air-conditioning systems face challenges in accurately estimating flow rates and classifying fluid mixtures, particularly in systems using blended formulations like water-glycol mixtures, due to the need for separate sensors for flow rate and fluid classification, which increases complexity and costs.
Innovation Solution
A valve system with integrated temperature transducers and a controller that uses a heater to record temperature set points and quantify energy or time required to attain these set points, allowing for both fluid classification and flow rate estimation using the same set of transducers, thereby simplifying the measurement process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate sensors are used for flow rate and fluid classification, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent combines flow rate measurement and fluid classification functions into a single sensor system. The sensor measures both temperature differential (for flow rate calculation) and thermal response characteristics (for fluid classification), eliminating the need for separate sensors and reducing overall system complexity while maintaining measurement accuracy for both parameters.
Solution Approach 2:
The sensor is designed to perform multiple functions: it measures temperature differential for flow rate estimation and simultaneously captures thermal response data for fluid classification. This multi-functional approach allows a single device to replace what would traditionally require separate specialized sensors, reducing complexity while preserving measurement precision.
2Measurement precision
If separate sensors are used for flow rate and fluid classification, then measurement accuracy is improved, but system costs increase
Solution Approach 1:
The patent merges flow rate measurement and fluid classification capabilities into one integrated sensor system. By using a single transducer to capture both temperature differential data (for flow rate) and thermal response characteristics (for fluid type identification), the system eliminates the need for multiple separate sensors, thereby reducing both complexity and cost while maintaining accurate flow rate estimation.
Solution Approach 2:
The sensor system is designed with universal functionality to perform both flow rate estimation and fluid classification tasks. This multi-functional design allows the same hardware to serve multiple measurement purposes, reducing the total number of components required and consequently lowering system costs and complexity while preserving measurement accuracy.
3Measurement precision
If multiple transducers are used for both measurements, then measurement accuracy is improved, but system complexity increases
Solution Approach 1:
The sensor is designed as a universal measurement device that simultaneously captures temperature differential information for flow rate calculation and thermal response characteristics for fluid classification. This single multi-functional transducer replaces what would traditionally require multiple specialized sensors, maintaining comprehensive measurement accuracy while significantly reducing system complexity.
Solution Approach 2:
The patent combines multiple measurement functions (flow rate sensing and fluid classification) into a single integrated transducer system. By merging these functions into one device that captures both temperature differential and thermal response data, the system achieves accurate fluid parameter measurement without the complexity of multiple separate transducers.
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 enables accurate classification of fluids and estimation of flow rates within heating, ventilation, and air-conditioning systems, reducing system complexity and costs by utilizing a single set of transducers for both measurements.
Implementation Method 1
The controller (7) being configured to: control a heater (8) situated in the fluid path (4)
Implementation Method 2
a first (5; 5a; 5b) and a second (5; 5b; 5a) temperature transducer; the controller (7) being in operative communication with the valve actuator (9), with the heater (8) and with the temperature transducers (5; 5a, 5b)
Data Source
AI summary
A valve comprising a controller; a heater; and two temperature transducers. The controller sends a close signal to the actuator and records a first temperature signal from the first temperature transducer, then controls the heater to attain a first temperature set point at the second temperature transducer. The controller records a time or an amount of energy required to attain the first temperature set point, then sends an open signal. The controller records a second temperature, controls the heater to attain a second set point at the second transducer, and records a time or an energy required to attain the second temperature set point. The controller classifies a fluid inside based on the first value and a flow rate of the fluid through the fluid path based on the second value.