Multi-segmented Tube Sheet for Heat Exchanger Manufacturing
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Solution Overview
Problem
The manufacturing of traditional tube sheets for filtration and heat exchange applications is costly and time-consuming due to their thick, one-piece construction, which requires high-tolerance machining, and lacks efficient process control.
Innovation Solution
A multi-segment tube sheet construction using thinner layers aligned and secured together with fasteners, incorporating an interstitial media layer for enhanced structural integrity and multifunctionality, such as filtration and sensing, allowing for faster production and integration of sensors for real-time process monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a thick one-piece tube sheet is used to maintain structural rigidity under differential pressure, then structural strength is improved, but manufacturing time and cost increase significantly
Solution Approach 1:
The tube sheet is divided into multiple thinner segments or layers that are stacked and secured together. This segmentation allows each individual layer to be manufactured quickly using automated processes, while the stacked assembly collectively provides the required structural rigidity to withstand differential pressures, resolving the contradiction between manufacturing speed and structural strength.
Solution Approach 2:
The invention uses a composite structure consisting of multiple thin tube sheet layers combined with an interstitial media layer. This composite construction achieves the structural integrity of a thick one-piece tube sheet while allowing each component to be manufactured efficiently, thereby reducing overall manufacturing time and cost.
2Strength
If a thick one-piece tube sheet is used to maintain structural rigidity, then structural strength is improved, but manufacturing cost increases
Solution Approach 1:
By segmenting the tube sheet into multiple thin layers, the invention enables the use of cost-effective automated manufacturing processes for each layer, rather than expensive high-tolerance machining of a single thick piece. The stacked assembly maintains structural rigidity while significantly reducing manufacturing cost.
Solution Approach 2:
The invention changes the thickness parameter from a single thick layer to multiple thin layers, which fundamentally alters the manufacturing approach from expensive precision machining to cheaper automated processes, thereby reducing manufacturing cost while preserving structural integrity.
3Reliability
If traditional tube sheet construction is used, then structural integrity is maintained, but process control capability is limited
Solution Approach 1:
The interstitial media layer serves multiple functions: it provides structural separation between tube sheets, enables filtration, and most importantly, allows integration of sensors for real-time monitoring of temperature, pressure, and flow parameters. This multi-functionality enhances process control capability while maintaining structural integrity.
Solution Approach 2:
The interstitial media layer acts as an intermediary between the tube sheets, providing a functional space that can accommodate sensors and filtration media. This intermediary layer enables advanced process control and monitoring capabilities without compromising the structural role of the tube sheets.
4Manufacturing precision
If high-tolerance machining is used to create holes in thick tube sheets, then tube spacing precision is improved, but manufacturing time increases
Solution Approach 1:
By dividing the thick tube sheet into multiple thin layers, the invention allows holes to be punched through each thin layer quickly using automated presses, rather than drilling through a single thick piece. The stacked assembly maintains precise tube spacing, resolving the contradiction between manufacturing speed and precision.
Solution Approach 2:
The invention replaces the slow mechanical drilling process with faster automated punching processes for creating holes in thin layers. This substitution of manufacturing methods significantly reduces production time while maintaining the required precision for tube spacing through the stacked assembly.
Data Source
AI summary
A heat exchanger that is constructed with a heat exchanger shell having inlet and outlet plenums and fluid inlet and outlet ports, and a tube sheet construction disposed in the heat exchanger shell. The tube sheet construction includes at least two separate tube sheets and a plurality of tubes that extend between the separate tube sheets. Each tube sheet includes at least two planar tube sheet segments and an interstitial layer disposed between the at least two tube sheet segments, and at least one sensor element supported by each of the interstitial layers. A control monitor controls flow through the shell by a feedback control from the sensor to an inlet control valve and/or a stimulus device excites the media layer.