Segmented Heat Exchanger Layout for Uniform Refrigerant Distribution
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Solution Overview
Problem
Conventional heat exchangers in HVAC systems suffer from non-uniform distribution of refrigerant in the second portion of tubes, leading to dead zones and sub-optimal heat exchange efficiency.
Innovation Solution
A heat exchanger design with multiple segments and perforated blocking elements to ensure uniform distribution of refrigerant across the heat exchange elements, enhancing the pressure drop and distribution within the tubes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the outlet is provided in the top section of the second portion of tubes, then the refrigerant can egress from the heat exchanger, but the refrigerant is unevenly distributed in the second portion of tubes causing formation of dead zones in the lower section
Solution Approach 1:
The heat exchanger is divided into multiple segments (first portion and second portion of tubes) with separate outlet arrangements. The first portion has outlets at its end, while the second portion has outlets positioned at its start near the first blocking element. This segmentation allows independent optimization of refrigerant distribution in each portion, preventing dead zones and improving overall heat exchange efficiency.
2Manufacturing precision
If two outlets are provided in the second portion of manifold, then dead zones may be reduced, but the refrigerant follows less resistant path and exits quickly without getting distributed to whole area
Solution Approach 1:
A second blocking element is introduced as an intermediary component in the first manifold, positioned to control the flow of refrigerant into the second portion of tubes. This blocking element, working in conjunction with the outlet arrangement, acts as a mediator to distribute refrigerant uniformly across the second portion before it reaches the heat exchange tubes, preventing premature exit and ensuring complete area coverage.
3Productivity
If the outlet is repositioned to a lower section of the second portion of tubes, then dead zones in the top section are formed, but the refrigerant distribution remains non-uniform
Solution Approach 1:
Instead of positioning outlets at the traditional end location of the second portion, the outlets are inverted to be positioned at the start of the second portion near the first blocking element. This inverted arrangement, combined with the blocking element's positioning, creates a flow pattern where refrigerant is forced to distribute uniformly across all tubes from the beginning, preventing dead zones regardless of gravity-induced flow preferences.
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 multi-segment design with perforated blocking elements improves the uniformity of refrigerant distribution, reducing dead zones and enhancing the overall heat exchange efficiency of the heat exchanger.
Implementation Method 1
The refrigerant flows through the tubes in the first portion of tubes and the second portion of tubes to absorb heat from the first portion of tubes and second portion of tubes respectively
Implementation Method 2
a baffle is provided in the second set of tubes to increase pressure drop of the refrigerant in the second set of tubes
Data Source
AI summary
A heat exchanger having multiple segments is described. The heat exchanger includes a pair of manifolds, having tubes extending therein. Further, a first blocking element is provided in a manifold to divide the tubes into a first set of tubes and a second set of tubes having a fluid communication with each other. Further, a second blocking element is provided in the manifold, corresponding to the second set of tubes, to further divide the second set of tubes into a first segment of tubes and a second segment of tubes. Further, an inlet is provided on the manifold to introduce the heat exchange fluid to the first set of tubes. Further, a plurality of outlets provided on the manifold to receive the heat exchange fluid from the second set of tubes.