Slanted Heat Exchanger Layout for Compact Serviceable AHUs
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Solution Overview
Problem
Conventional air handling units (AHUs) have a large footprint and components are difficult to access, leading to reduced maintenance and efficiency due to their complex structure and limited space, which hinders installation and serviceability.
Innovation Solution
The AHU design features a slanted heat exchanger and filter with inlet and outlet headers extending through one side of the cabinet, allowing easy access to all components, including the blower, motor, and drain pan, which reduces the overall footprint and simplifies installation and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the AHU contains multiple cabinets with heat exchanger, blower and other components, then the AHU can perform heating, ventilation and air conditioning functions, but the volumetric size of the AHU becomes large
Solution Approach 1:
The patent combines the heat exchanger, blower, filter, and control components into a single integrated cabinet structure, eliminating the need for multiple separate cabinets. This merging of components reduces the overall volumetric size while maintaining complete HVAC functionality including heating, cooling, and air filtration.
Solution Approach 2:
The heat exchanger is positioned at an angle relative to the cabinet sides, utilizing diagonal space rather than orthogonal arrangements. This angular positioning allows for more efficient space utilization within the cabinet, reducing the required volume while accommodating all necessary components.
2Reliability
If the AHU is connected with piping lines and drain lines, then the AHU can supply and return working medium and drain condensate, but these lines occupy more space
Solution Approach 1:
The inlet and outlet headers of the heat exchanger are positioned to extend through the cabinet sides, extracting the connection points to the exterior. This allows piping lines to be connected directly at the cabinet perimeter rather than requiring internal routing space, reducing the area occupied by lines within the cabinet.
Solution Approach 2:
The cabinet sides act as intermediaries that house the headers and provide external connection points. By positioning headers through the cabinet sides rather than requiring internal clearance for complex piping routes, the design minimizes the space occupied by drainage and supply lines while ensuring reliable connectivity.
3Volume of moving object
If components within the AHU are difficult to reach, then the AHU structure can be compact, but maintenance and repair become less likely and performance decreases
Solution Approach 1:
The cabinet incorporates removable panels on its sides that can be detached to provide direct access to internal components such as the heat exchanger, blower, and filter. This segmentation of the cabinet structure into removable and fixed portions maintains a compact external footprint while enabling easy maintenance and repair operations without requiring disassembly of the entire unit.
Solution Approach 2:
The positioning of headers through the cabinet sides and the inclusion of removable panels enable routine maintenance tasks such as filter replacement and component inspection to be performed easily by operators without requiring specialized tools or extensive disassembly, promoting regular maintenance and improving overall system reliability.
4Adaptability or versatility
If the AHU is disposed in an enclosed environment with limited space, then the AHU can be installed in rooms or closets, but the footprint of the AHU must be reduced
Solution Approach 1:
By integrating all HVAC components into a single cabinet rather than using multiple separate units, the design minimizes the footprint required for installation. This consolidated approach allows the AHU to be accommodated in enclosed environments such as rooms or closets where space is limited, while maintaining complete heating, ventilation, and air conditioning capabilities.
Solution Approach 2:
The angular positioning of the heat exchanger and optimized internal component layout utilize three-dimensional space more efficiently, reducing the horizontal footprint of the cabinet. This allows the AHU to fit into confined installation locations while accommodating all necessary components for full HVAC functionality.
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 design enables easier access and maintenance, improves installation efficiency, and allows for a more compact footprint, enhancing the AHU's performance and longevity by simplifying service operations and accommodating more heat exchange elements.
Implementation Method 1
The heat exchanger is disposed in the air flow path and adapted to conduct heat exchange between air passing through the air flow path and a working medium flowing in the heat exchanger
Implementation Method 2
The blower is vertically disposed relative to the heat exchanger in the cabinet for forcing air to flow through the air flow path
Implementation Method 3
The AHU may include a drain pan in the cabinet that is elevated from a bottom side of the cabinet for collecting condensate generated in the heat exchanger
Data Source
AI summary
An AHU comprises a cabinet, a heat exchanger and a blower. The cabinet has an air inlet opening and an air outlet opening, panels are provided on sides of the cabinet forming an air flow path for air flowing through the air handling unit between the air inlet opening and the air outlet opening. The heat exchanger is disposed in the air flow path and adapted to conduct heat exchange between air passing through the air flow path and a working medium flowing in the heat exchanger. The heat exchanger includes an inlet header for supplying the working medium and an outlet header for collecting the working medium. The heat exchanger is slanted with respect to a side of the cabinet such that the inlet header and the outlet header extend through one of the sides of the cabinet for providing access to the inlet header and the outlet header from the one of the sides of the cabinet. The blower is vertically disposed relative to the heat exchanger in the cabinet for forcing air to flow through the air flow path.