Heat Exchanger Flat Tubes Passage Screen Aperture
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Solution Overview
Problem
Conventional heat exchangers often exhibit inhomogeneous temperature distributions, leading to decreased efficiency due to 'cold spots', which affect the thermal coupling of fluids.
Innovation Solution
A heat exchanger design featuring an inflow pipe with a fluid inlet and adjacent flat tubes, where a passage screen aperture is integrated to reduce swirl flows and ensure a homogeneous distribution of a two-phase refrigerant-oil mixture, allowing for optimal fluid flow and heat exchange between two fluid streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional heat exchanger design is used, then structure is simple, but temperature distribution is inhomogeneous causing cold spots
Solution Approach 1:
The heat exchanger is divided into multiple flat tubes arranged in parallel, each tube serving as an independent heat transfer channel. This segmentation allows uniform distribution of the two-phase refrigerant-oil mixture across multiple paths, preventing cold spots and improving overall temperature homogeneity while maintaining manageable structural complexity
Solution Approach 2:
A passage screen aperture is introduced as an intermediary component in the fluid path before the flat tubes. This screen acts as a flow distributor that ensures uniform mixture distribution across all flat tubes, eliminating cold spots and improving temperature homogeneity without significantly complicating the overall structure
2Productivity
If inhomogeneous temperature distribution occurs, then heat exchanger efficiency decreases, but no additional components are added
Solution Approach 1:
The passage screen aperture modifies flow parameters by creating a uniform distribution pattern of the two-phase refrigerant-oil mixture across all flat tubes. This parameter change in flow distribution ensures each tube receives equal refrigerant flow, maximizing heat transfer efficiency and eliminating cold spots without adding complex control systems
Solution Approach 2:
The passage screen serves as a simple intermediary component that passively ensures uniform flow distribution. By introducing this single component, the system achieves optimal heat exchanger efficiency through homogeneous temperature distribution without requiring complex active control mechanisms
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
The design achieves a relatively homogeneous temperature distribution across the heat exchanger, enhancing efficiency by ensuring each flat tube receives a consistent fluid volume flow, thereby improving heat transfer between the fluid streams.
Implementation Method 1
The passage screen aperture interacts with the heat exchanger fluid so that when the heat exchanger fluid flows into the inflow pipe, swirl flows in the heat exchanger fluid generated in the region of the fluid inlet, which in practice are referred to as swirl flows, are dissolved or at least reduced
Implementation Method 2
the flat tubes can be flowed through by the first fluid stream and flowed about by the second fluid stream. In particular, a heat stream at this point can be exchanged between the two fluid streams, wherein the first fluid stream functions as heat sink and the second fluid stream as heat source
Implementation Method 3
a first fluid stream of heat exchanger fluid which is formed in particular by a two-phase refrigerant-oil mixture
Data Source
AI summary
A heat exchanger for the thermal coupling of two fluids may include an inflow pipe defining a pipe longitudinal centre axis. A fluid inlet may be arranged on the inflow pipe. A plurality of flat tubes leading into the inflow pipe may be arranged on the inflow pipe adjacent to the fluid inlet. The first fluid stream may be flowable along a first fluid path extending from the fluid inlet through the inflow pipe and the plurality of flat tubes. The flat tubes may extend through a second fluid path for a second fluid stream of fluid and may be flowed about by the second fluid stream during operation. The heat exchanger may further include passage screen aperture interacting with the heat exchanger fluid and through which the first fluid stream is flowable. The passage screen aperture may be fluidically connected in series with the flat tubes.