Segmented Heat Exchanger Headers for Weight Reduction
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Solution Overview
Problem
Existing heat exchanger header designs face challenges in minimizing wall pressures and efficiently handling complex geometries created by Additive Manufacturing (AM), which can lead to increased weight and pressure loads.
Innovation Solution
The design incorporates a novel header with multiple small pressure vessels that decouple pressure loads from the heat exchanger core, featuring a primary distribution header and distribution header channels that taper and have teardrop cross-sections for AM manufacture, along with fins for structural rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a typical header chamber form is used to minimize expansion/contraction pressure losses and promote uniform flow distribution, then flow distribution is improved, but the pressure vessel becomes relatively large requiring thick walls or stiffening features which creates undesirable weight
Solution Approach 1:
The header is segmented into multiple thin-walled panels instead of using a single large pressure vessel. Each panel is individually supported by struts, allowing the header to maintain structural integrity with thinner walls while still containing the required pressure, thereby reducing overall weight while preserving flow distribution characteristics
Solution Approach 2:
The header design transitions from a traditional three-dimensional pressure vessel to a two-dimensional panel-based structure. By flattening the header chamber into panels that can be supported from behind by struts, the design eliminates the need for thick walls to contain pressure, achieving weight reduction while maintaining functional performance
2Stress or pressure
If the tubeplate is designed as part of the header pressure vessel to contain high pressure loads, then pressure containment is improved, but the high-pressure loads become a design limitation
Solution Approach 1:
The tubeplate is separated from the header pressure vessel, with each tube individually supported by struts rather than relying on the tubeplate to contain all pressure loads. This segmentation allows the header to be designed as a low-pressure structure while still maintaining high-pressure containment capability, eliminating the design limitation
Solution Approach 2:
Struts are introduced as intermediary elements between the tubes and the header panels. These struts provide localized pressure support at each tube location, acting as mediators that transfer pressure loads away from the header walls and tubeplate, thereby enabling high-pressure operation without complicating the overall design
3Adaptability or versatility
If AM is used to manufacture headers with complex geometries, then manufacturing flexibility is improved, but the headers may require integration with non-AM cores which complicates the joining process
Solution Approach 1:
The header panels and struts are designed to be integrated into a single additive manufacturing process, allowing the entire header structure to be manufactured as one piece. This merging of components eliminates the need for separate joining operations between AM-manufactured headers and non-AM cores, simplifying the manufacturing process while maintaining geometric flexibility
Data Source
AI summary
A plurality of heat exchanger designs with integrated headers are provided. The heat exchanger comprises a heat exchanger matrix with a plurality of flow paths in a first direction wherein the plurality of flow paths are patterned to create a plurality of inputs to the plurality of flow paths on an input surface. The integrated header comprises a primary distribution header and a plurality of distribution header channels that connect to a plurality of feeder tubes that fluidly couple the plurality of distribution header channels with the plurality of matrix inputs such that there is a single feeder tube for each input.