Variable-Diameter Condenser Tubes for Higher Heat Transfer
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Solution Overview
Problem
Conventional condenser designs with constant cross-sectional areas lead to inadequate heat transfer surface areas near the entrance of hot vapor or vapor/liquid mixtures and excess surface areas in sections with higher liquid content, resulting in oversized and heavy heat exchangers with inefficient heat transfer.
Innovation Solution
The condenser apparatus features tubes with varying hydraulic diameters, starting larger at the inlet and tapering to smaller diameters towards the outlet, along with a heat exchanger core that includes fin material connecting the tubes, optimizing heat transfer by varying cross-sectional areas based on liquid content and using horizontal coolant flow to enhance heat removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If constant cross-sectional area tubes are used in conventional condenser designs, then the structure is simple and easy to manufacture, but the heat transfer surface area is inadequate near the entrance and excessive in mid and lower sections, resulting in oversized and heavy heat exchangers
Solution Approach 1:
The patent applies local quality by varying the tube cross-sectional area along its length. Tubes have larger cross-sectional areas near the vapor inlet where heat transfer coefficients are lower, and smaller cross-sectional areas in mid and lower sections where liquid content increases. This non-uniform geometry optimizes heat transfer surface area distribution to match the local heat transfer needs, reducing overall heat exchanger size and weight while maintaining manufacturing feasibility through standard tapering processes
Solution Approach 2:
The patent changes the geometric parameter of tube cross-sectional area along the flow direction. By progressively reducing the tube diameter from inlet to outlet, the design adapts to changing flow conditions (vapor quality, density, heat transfer coefficients) without requiring complex variable geometry, thus achieving weight reduction while keeping the structure relatively simple and manufacturable
2Device complexity
If constant cross-sectional area tubes are used in conventional condenser designs, then the design is straightforward, but heat transfer efficiency is reduced due to inadequate surface area near the entrance and excess surface area in sections with higher liquid content
Solution Approach 1:
The patent implements local quality by tailoring the tube cross-sectional area to the local heat transfer requirements at different positions. Larger areas are provided where vapor quality is high and heat transfer coefficients are low, while smaller areas are used where liquid content is high. This creates an optimized heat transfer surface area distribution that significantly improves overall heat transfer efficiency without introducing excessive design complexity
Solution Approach 2:
The patent introduces dynamic adaptation to changing flow conditions by varying the tube geometry along the flow direction. The progressive tapering allows the heat transfer surface area to dynamically match the local heat transfer coefficients and flow characteristics, enabling the heat exchanger to maintain high efficiency throughout the condensation process rather than relying on a static, uniform design
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 achieves higher heat transfer rates and reduces the overall size and weight of the condenser, while preventing pump cavitation by ensuring the liquid is subcooled and maintaining optimal pressure gradients, thus improving the efficiency and performance of the heat exchanger.
Implementation Method 1
Condensers are heat exchangers that convert hot vapor, or high quality vapor/liquid mixtures, to liquids, by transferring heat from the hot vapor or vapor/liquid mixture to the adjacent cooler fluid flows
Implementation Method 2
Coolant may flow around the tubes substantially horizontally to remove heat from the tubes
Implementation Method 3
Condensers are heat exchangers that convert hot vapor, or high quality vapor/liquid mixtures, to liquids, by transferring heat from the hot vapor or vapor/liquid mixture to the adjacent cooler fluid flows
Implementation Method 4
As heat is removed from the vapor or high quality vapor/liquid mixture, its liquid content increases, resulting in density increases
Data Source
AI summary
A condenser having passages of varying geometry for cooling of fluid. The condenser apparatus includes substantially parallel tubes each defining a channel and having an inlet at a first end and an outlet at a second end, the first end having a greater hydraulic diameter than the second end. Inlet and outlet manifolds are provided. The tubes may be oriented substantially vertically with the inlets above the respective outlets. A heat exchanger core comprises the tubes and substantially horizontally oriented fin material connecting the tubes. The tubes may receive a relatively higher temperature vapor or vapor and liquid mixture into the inlets of the tubes, around the tubes coolant flows substantially horizontally to remove heat from the tubes, and relatively cooler saturated liquid is discharged from the outlets. In one embodiment, the tube's channel splits into multiple channels to reduce the hydraulic diameter and increase the surface area ratio.