Offset Heat Exchanger Layout for Compact AC Accumulator Integration
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Solution Overview
Problem
Existing combined devices for air conditioning loops in motor vehicles, comprising an internal heat exchanger and an accumulator, face challenges in integration due to restrictive layout and increased volume requirements, particularly with 'high pressure' and 'low pressure' refrigerant inlets and outlets being on the same side, which complicates integration into the engine compartment.
Innovation Solution
The heat exchanger is offset with respect to the enclosure to minimize external dimensions, creating an evacuation chamber without increasing the enclosure's diameter or length, allowing for a more compact design that maintains low pressure drops and facilitates integration into the engine compartment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the heat exchanger is positioned centrally within the enclosure, then the structural symmetry is maintained, but the external dimensions increase and integration into the engine compartment becomes difficult
Solution Approach 1:
The heat exchanger is deliberately positioned asymmetrically within the enclosure, offset from the central axis toward one end. This asymmetric arrangement allows the combined device to have a more compact external profile while maintaining adequate internal clearance for refrigerant flow, facilitating easier integration into the constrained engine compartment space.
Solution Approach 2:
Instead of arranging components along a single linear axis, the invention utilizes three-dimensional spatial arrangement by offsetting the heat exchanger laterally within the enclosure. This dimensional optimization allows compact packaging while maintaining functional clearances, enabling integration into the limited engine compartment volume.
2Volume of moving object
If the heat exchanger is offset to minimize external dimensions, then compactness is achieved, but internal pressure drops may increase
Solution Approach 1:
The offset positioning of the heat exchanger creates locally optimized flow paths within the enclosure. By strategically positioning the heat exchanger at a specific offset distance from the center, the design maintains adequate clearance for refrigerant flow while minimizing overall device dimensions, balancing compactness with acceptable pressure drop characteristics.
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 offset arrangement enables a compact component design that is easier to integrate into the engine compartment without increasing internal pressure drops, optimizing space usage while maintaining efficient refrigerant flow and separation within the air conditioning loop.
Implementation Method 1
The heat exchanger is capable of cooling the high pressure refrigerant by yielding heat to the low pressure refrigerant
Implementation Method 2
The refrigerant fluid circulating inside the 'high pressure' branch can give up heat to the refrigerant circulating inside the 'low pressure' branch
Implementation Method 3
The accumulator performs a separation function between a gaseous phase and a liquid phase of the refrigerant fluid. The refrigerant in the liquid state coming from the evaporator separates into gaseous phase and liquid phase, the latter coming to accumulate by gravity
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a combined device 1 comprising a housing 2 containing at least one heat exchanger 9 and an accumulation zone 11, said housing 2 extends along a primary central axis A and said heat exchanger 9 extends along a secondary central axis B, characterized in that the primary central axis A is offset with respect to the secondary central axis B.