Economizer having source-specific damper blade assemblies and heating, ventilation and air conditioning unit employing the same
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Solution Overview
Problem
Conventional economizers face a trade-off between pressure drop and volume control, with damper blades moving in parallel offering lower pressure drop but less precise control, and those moving in opposition providing more precise control but higher pressure drop, necessitating source-specific damper blade assemblies to optimize both for return and outdoor air management in HVAC systems.
Innovation Solution
The implementation of source-specific damper blade assemblies, where damper blades for return air move in parallel and those for outdoor air move in opposition, allowing for optimized enthalpy blending and compliance with building ventilation codes while maintaining high HVAC efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If damper blades move in parallel, then pressure drop is reduced, but volume control precision deteriorates
Solution Approach 1:
The damper assembly is segmented into multiple individual damper blades rather than a single blade. Each blade can be independently positioned and controlled, allowing the system to achieve both low pressure drop (by optimizing blade spacing and configuration) and precise volume control (by independently adjusting each blade's position). This segmentation enables fine-grained control over airflow while maintaining aerodynamic efficiency.
Solution Approach 2:
The damper blades are designed to be dynamically adjustable rather than fixed. Each blade can rotate to different angular positions, allowing the system to adapt its configuration based on operational requirements. This dynamic capability enables the blades to move in parallel for low pressure drop conditions and adjust to opposition or intermediate positions for precise volume control when needed.
2Measurement precision
If damper blades move in opposition, then volume control precision is improved, but pressure drop increases
Solution Approach 1:
Different regions of the damper assembly have different blade configurations optimized for their specific functions. Some blades are positioned to move in opposition for precise control in critical airflow regions, while other blades move in parallel to minimize pressure drop in regions where control precision is less critical. This local optimization allows the system to achieve both precision and efficiency simultaneously across different parts of the assembly.
Solution Approach 2:
The system changes the operational parameters of individual damper blades independently. Each blade can be adjusted to different angular positions, allowing the system to vary the degree of opposition or parallel movement based on operational conditions. This parameter flexibility enables the system to optimize the trade-off between pressure drop and control precision dynamically rather than being constrained to a single fixed configuration.
Data Source
AI summary
An economizer having a first air inlet, a second air inlet and an air outlet, a method of operating an economizer and a heating, ventilation and air conditioning (HVAC) system employing the economizer. In one embodiment, the economizer includes: (1) a first damper blade assembly in fluid communication with the first air inlet and the air outlet and having a first plurality of damper blades configured to move in parallel and (2) a second damper blade assembly in fluid communication with the second air inlet and the air outlet and having a second plurality of damper blades configured to move in opposition.