Blower Scroll Pressure Sensing for HVAC Airflow Commissioning
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Solution Overview
Problem
HVAC systems face challenges in accurately monitoring and adjusting airflow rates post-installation, leading to inefficiencies and increased energy consumption due to the expense and unreliability of existing measurement methods and equipment.
Innovation Solution
An airflow managing system that includes an air pressure sensor to measure pressure directly from the scroll of an air blower and a HVAC controller to determine airflow rates based on these measurements and associated parameters, allowing for real-time monitoring and adjustment of airflow rates to optimize system efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional airflow measurement methods are used during commissioning, then airflow data can be obtained, but the process becomes expensive, labor intensive, and time prohibitive
Solution Approach 1:
The patent replaces traditional mechanical airflow measurement devices (flow hoods, balers) with a pressure-based measurement system. A pressure sensor measures static pressure at the blower scroll, and a processor calculates airflow rate using the pressure differential and system parameters, eliminating the need for complex mechanical measurement equipment and reducing commissioning time
Solution Approach 2:
The patent introduces pressure as an intermediary parameter to indirectly measure airflow. Instead of directly measuring airflow with complex equipment, the system measures pressure at the blower scroll and uses this pressure data along with system parameters to calculate airflow rate, simplifying the measurement process
2Measurement precision
If sensors and equipment are installed to monitor airflow after installation, then airflow can be monitored, but the expense and unreliability of such equipment increases
Solution Approach 1:
The patent makes the pressure sensor serve multiple functions: it is used during commissioning to establish baseline airflow data and continues to monitor airflow throughout the system's operation. This eliminates the need for separate commissioning and operation equipment, reducing overall expense and improving reliability through consistent measurement methodology
Solution Approach 2:
The system uses existing HVAC components (blower motor, scroll housing) and a single pressure sensor to provide both commissioning and ongoing monitoring functions. The blower motor parameters and system characteristics serve the system itself, eliminating dependence on external, expensive, and potentially unreliable specialized measurement equipment
3Productivity
If commissioning is conducted to verify system performance, then system efficiency can be optimized, but the process becomes expensive and labor intensive
Solution Approach 1:
The patent replaces complex mechanical commissioning procedures and equipment with an electronic pressure-based measurement and calculation system. The processor automatically calculates airflow rates and compares them to design values, providing comprehensive commissioning data through simple pressure measurements rather than complex manual procedures
Solution Approach 2:
The patent changes the measurement parameter from direct airflow measurement to pressure measurement. By measuring pressure at the blower scroll and using it to calculate airflow rate, the system simplifies the commissioning process while maintaining the ability to verify system performance and efficiency
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 reduces the time and cost associated with commissioning and post-installation adjustments, improves energy efficiency, and enhances the ability to operate HVAC systems effectively by providing precise airflow rate measurements and adjustments.
Implementation Method 1
an air pressure sensor configured to obtain an air pressure measurement directly from a scroll of an air blower
Data Source
AI summary
An airflow managing system for monitoring airflow of a HVAC system, a HVAC system and a method of monitoring the airflow in a HVAC system is provided. In one embodiment, the airflow managing system includes: (1) an air pressure sensor configured to obtain an air pressure measurement directly from a scroll of an air blower of the HVAC system and (2) a HVAC controller configured to determine an airflow rate for the HVAC system based on the air pressure measurement and corresponding parameters associated with the air blower.