Dual Evaporator Pipe Layout for Uniform Refrigerator Cooling
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Solution Overview
Problem
Existing refrigerating apparatuses with nonazeotropic refrigerant mixtures face challenges in achieving sufficient cooling efficiency and even temperature distribution due to difficulties in attaching evaporation pipes to rectangular parallelepiped inner boxes, leading to increased manufacturing costs and uneven temperature distribution.
Innovation Solution
The refrigerating apparatus incorporates a configuration with a nonazeotropic refrigerant mixture and a dual evaporator system, where the evaporation pipes are attached to the outer face of the inner box in a meandering pattern, ensuring thermal contact and uniform temperature distribution, and utilizes a second heat exchanger to enhance liquefaction efficiency of the refrigerants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If evaporation pipes are attached to the outer face of the inner box in a meandering pattern, then temperature distribution uniformity is improved, but device complexity increases
Solution Approach 1:
The evaporation pipes are configured in a meandering pattern with curved sections instead of straight lines, allowing the pipes to follow the outer contour of the inner box. This curved configuration enables better thermal contact with the box surface, improving temperature distribution uniformity while maintaining manufacturing feasibility through standardized pipe bending techniques.
2Productivity
If a dual evaporator system with multiple heat exchangers is implemented, then cooling efficiency is improved, but device complexity increases
Solution Approach 1:
The refrigerant circuit is divided into multiple independent evaporator systems, each with its own heat exchanger and control mechanism. This segmentation allows each evaporator to independently serve specific cooling zones, improving overall cooling efficiency and flexibility while enabling modular manufacturing and maintenance of individual components.
Solution Approach 2:
Different heat exchangers are strategically positioned at various locations within the refrigerated space to address local cooling requirements. Each heat exchanger is optimized for its specific location and thermal load characteristics, ensuring efficient heat transfer in different zones while maintaining overall system performance.
3Productivity
If nonazeotropic refrigerant mixture is used, then cooling performance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The system utilizes a nonazeotropic refrigerant mixture with specifically selected composition ratios and thermodynamic properties. By carefully controlling the refrigerant blend parameters during manufacturing and providing clear charging specifications, the system achieves enhanced cooling performance through the refrigerant's temperature glide characteristic while maintaining feasible manufacturing tolerances.
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 configuration improves cooling efficiency, reduces manufacturing costs, and achieves uniform temperature distribution within the storage chamber by effectively utilizing the nonazeotropic refrigerant mixture and dual evaporator system.
Implementation Method 1
the first refrigerant is evaporated (gasified) by the evaporator
Implementation Method 2
the first refrigerant compressed by the compressor is, after being cooled and condensed (liquefied) by the condenser
Implementation Method 3
a heat exchanger is provided which is configured to cool the refrigerant before being supplied to the evaporator
Implementation Method 4
the evaporation pipe is attached to the outside of the top plate in a meandering manner, then attached in a meandering manner in which a back-and-forth structure extending on the outside from one of the side plates via the back plate to the other side plate
Data Source
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AI summary
A refrigerating apparatus includes: an insulation housing including an inner box, an outer box covering the inner box, and an insulation material filled between the inner box and the outer box; an insulation door configured to open or close an opening at a front of the insulation housing; a first refrigerating cycle includes a first evaporation pipe; and a second refrigerating cycle includes a second evaporation pipe; characterized in that the first evaporation pipe is attached to an outside of a top plate, the both side plates, the back plate, and a bottom plate of the inner box in such a manner that, as the first evaporation pipe goes from an upstream side to a downstream side of a flow of the refrigerant, the first evaporation pipe meanders outside the top plate, meanders outside the both side plates across a width extending through the both side plates and the back plate, further meanders outside the bottom plate, and the second evaporation pipe is attached to an outside of the top plate, the both side plates, the back plate, and the bottom plate of the inner box in such a manner that as the second evaporation pipe goes from an upstream side to a downstream side of the flow of the refrigerant, the second evaporation pipe meanders outside the top plate so as not to overlap the first evaporation pipe, meanders outside the both side plates and the back plate across a width extending through the both side plates and the back plate from an upper side to a lower side, further meanders outside the bottom plate.