Duct-Mountable Sensing Unit for HVAC Leakage Reduction
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Solution Overview
Problem
Current sensing technologies for monitoring temperature, humidity, CO2, and pressure in ventilation systems require multiple sensors installed at various points, leading to increased costs and potential leakage issues, especially in systems with varying occupancy and energy efficiency concerns.
Innovation Solution
A single sensing unit is designed to be installed at a single insertion point in a duct, combining sensors for temperature, humidity, CO2 concentration, and pressure, with a rotatable sensor beam and modular housing to accommodate multiple sensors, reducing installation complexity and leakage risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensors are installed at various points in the duct, then comprehensive monitoring of temperature, humidity, CO2, and pressure is achieved, but installation complexity and leakage risks increase
Solution Approach 1:
The patent combines multiple sensors (temperature, humidity, CO2, and pressure sensors) into a single integrated sensing unit that can be installed at one location in the duct. This merging of multiple sensing functions into one device reduces installation complexity while maintaining comprehensive monitoring capability, directly resolving the contradiction between measurement precision and device complexity
Solution Approach 2:
The sensing unit is designed as a universal device that performs multiple monitoring functions simultaneously - measuring temperature, humidity, CO2 concentration, and pressure all through a single installation point. This multi-functionality eliminates the need for separate sensor installations, reducing both installation complexity and potential leakage points while preserving accurate monitoring of all parameters
2Measurement precision
If multiple sensors are installed at various points, then comprehensive monitoring is achieved, but installation time and costs increase
Solution Approach 1:
By merging multiple sensor functions into a single integrated unit, the installation process requires only one mounting location and one set of connections, dramatically reducing installation time compared to installing multiple separate sensors at different locations while maintaining comprehensive monitoring coverage
3Measurement precision
If multiple sensors are installed at various points, then comprehensive parameter monitoring is achieved, but leakage risks increase
Solution Approach 1:
The patent merges multiple sensing functions into a single sealed unit with one installation interface, eliminating the multiple connection points that would exist with separate sensors. This single-point installation significantly reduces leakage risks while maintaining accurate detection of all environmental parameters through the integrated sensors
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 solution allows for efficient monitoring of multiple parameters with reduced installation time and costs, enhancing energy efficiency by adapting to varying occupancy conditions and minimizing sensor placement errors.
Implementation Method 1
a humidity sensor (132) that senses a humidity of the fluid
Implementation Method 2
Since the dielectric constant of air is one and the dielectric constant of water is approximately 80, changes in the relative humidity changes the dielectric constant of the air separating the capacitor plates, and, hence, the capacitance of the sensor
Implementation Method 3
Temperature is commonly measured with a thermistor or a resistance temperature detector (RTD) which exploit the predictable change in electrical resistance of certain materials when they are exposed to changing temperatures
Implementation Method 4
a pressure sensor (150) secured to the circuit board (48) that senses a pressure of the fluid
Data Source
AI summary
A duct-mountable sensing unit includes a plurality of sensors for detecting respective parameters, including pressure, of a fluid in a duct. The sensing unit enables fluid communication between the sensors and the fluid in the duct through a single insertion point in the duct.