Blow-Through Air Handler Layout for Stable Airflow and Compact HVAC
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Solution Overview
Problem
Conventional HVAC air handling units (AHUs) are undesirably large, inefficient, and prone to premature component failure due to improper airflow and component placement, which complicates installation and maintenance.
Innovation Solution
The AHU design is optimized by co-locating heating elements with the heat exchanger downstream of the blower, aligning fins parallel to the airflow to stabilize it, and positioning air openings on the sides for increased flexibility and reduced unconditioned air intake, resulting in a more compact and efficient system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional AHU components are positioned to promote air handling capability, then air handling performance is improved, but the volumetric size of the cabinet becomes much larger than necessary
Solution Approach 1:
The patent combines the blower and heat exchanger into a compact integrated assembly where the heat exchanger is positioned directly in the blower's discharge airflow path. This merging eliminates the need for separate large cabinet spaces for each component, achieving high air handling capability in a reduced volumetric footprint.
Solution Approach 2:
The patent utilizes three-dimensional spatial optimization by arranging components in layered configurations and utilizing vertical space within the cabinet. The heat exchanger sections are positioned at different heights and depths to maximize space utilization while maintaining efficient airflow paths, reducing the overall cabinet volume required.
2Use of energy by moving object
If heat exchanger fins are positioned perpendicular to airflow for maximum heat transfer, then heat transfer efficiency is improved, but airflow stability deteriorates causing turbulent flow and component damage
Solution Approach 1:
The patent divides the heat exchanger into multiple sections with fins oriented in different directions. The first section has fins oriented perpendicular to airflow for maximum heat transfer, while the second section has fins oriented parallel to airflow for flow stabilization. This local differentiation allows each section to perform its specific function optimally.
Solution Approach 2:
The second section of the heat exchanger acts as an intermediary between the turbulent discharge airflow from the blower and the heating elements. Its parallel fin orientation stabilizes the airflow, creating a more uniform flow pattern that protects downstream components while the first section maintains high heat transfer efficiency.
3Productivity
If air return opening is positioned at one end and air supply opening at opposing end, then conventional air handling is achieved, but unconditioned air intake increases and installation flexibility is reduced
Solution Approach 1:
The patent positions both the air return opening and air supply opening on adjacent sides of the cabinet, allowing the AHU to function effectively in various installation orientations and locations. This configuration enables the system to adapt to different spatial constraints in residential and commercial applications while maintaining proper airflow patterns and reducing unconditioned air intake.
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 configuration reduces the AHU's size, enhances airflow stability, improves heat transfer efficiency, decreases unconditioned air entry, and increases system reliability, making it more suitable for compact installations and reducing maintenance needs.
Implementation Method 1
disposing a heat exchanger within the enclosure downstream of the blower and in the discharge airflow path of the blower
Implementation Method 2
the heat exchanger comprises a first section and a second section, and wherein each of the first section and the second section comprises a plurality of fins
Implementation Method 3
disposing at least one electronically-powered resistive heating element substantially co-located with the heat exchanger and downstream of the heat exchanger in the discharge airflow path of the blower
Data Source
AI summary
A method of constructing an air handling unit includes forming an air handling enclosure, mounting a blower in the air handling enclosure, mounting a heat exchanger in the air handling enclosure downstream of the blower, and mounting at least one heating element in the air handing enclosure downstream of the blower. A method of operating an HVAC system includes disposing a heat exchanger downstream of a blower within an enclosure, providing an airflow through the enclosure, and orienting a plurality of fins on the heat exchanger to stabilize the airflow exiting the heat exchanger prior to the airflow contacting an electrically-powered resistive heating element.