Absorption Heat Pump Rotor Design for Uniform Solution Distribution
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Solution Overview
Problem
The existing absorption heat pump devices face issues with non-uniform distribution of the concentrated solution on the heat transfer surface, leading to inadequate heat exchange area and increased size, and require additional components like circulation pumps to maintain performance.
Innovation Solution
The absorption heat pump device incorporates a rotor with a hollow shaft and branch members that utilize centrifugal force to distribute the solution as a thin film across the heat transfer surface, eliminating the need for separate circulation pumps and enhancing heat exchange efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the injection nozzle is fixedly provided separately from the rotary shaft, then the concentrated solution is supplied to the heat transfer surface, but the solution distribution becomes non-uniform and the effective heat exchange area is insufficient
Solution Approach 1:
The injection nozzle is integrated with the rotary shaft, forming a combined structure where the nozzle is positioned at the center of the rotary shaft. This merging allows the rotating blades to uniformly distribute the concentrated solution supplied through the rotary shaft onto the heat transfer surface, achieving both uniform distribution and sufficient heat exchange area without requiring a separate fixed nozzle structure.
Solution Approach 2:
The injection system transitions from a static fixed nozzle to a dynamic rotary shaft with rotating blades. The rotary shaft rotates to distribute the concentrated solution dynamically across the heat transfer surface, ensuring uniform coverage and maximizing the effective heat exchange area while maintaining adaptability to different operating conditions.
2Productivity
If the diluted solution is immediately transferred from the lower end of the heat exchanger, then the solution circulation is rapid, but the diluted solution does not retain sufficiently in the absorber and fails to absorb refrigerant vapor adequately
Solution Approach 1:
The absorber is designed with a structure that allows diluted solution to be retained for a predetermined period before being discharged. This preliminary retention ensures that the diluted solution has sufficient time to absorb refrigerant vapor effectively, while the rotary shaft system maintains rapid circulation by continuously supplying fresh concentrated solution and efficiently removing diluted solution after the absorption period.
Solution Approach 2:
The system maintains continuous absorption performance by ensuring that diluted solution remains in the absorber for the required duration to complete the absorption process, while simultaneously maintaining continuous circulation through the rotary shaft mechanism that constantly replenishes concentrated solution and removes diluted solution in a seamless cycle.
3Reliability
If a circulation pump and solution circulation circuit are added to ensure absorption performance, then the diluted solution circulation is improved, but the device size increases
Solution Approach 1:
The rotary shaft system performs dual functions: it supplies concentrated solution to the heat transfer surface and simultaneously discharges diluted solution from the absorber. This self-service mechanism eliminates the need for separate circulation pumps and solution circulation circuits, maintaining reliable absorption performance while preventing device size increase.
Solution Approach 2:
The rotary shaft is designed as a multi-functional component that integrates solution supply, distribution, and discharge functions. By making the rotary shaft universal in its capabilities, the system achieves reliable diluted solution circulation and absorption performance without requiring additional dedicated pumping equipment, thereby avoiding device size enlargement.
4Productivity
If the heat transfer area is increased to compensate for non-uniform solution distribution, then the cooling performance is maintained, but the heat exchanger size increases
Solution Approach 1:
The system uses dynamic rotation of the rotary shaft to achieve uniform concentrated solution distribution across the heat transfer surface. This dynamic distribution ensures that the entire heat transfer area is effectively utilized, maintaining high cooling performance without requiring an oversized heat exchanger. The rotation enables consistent solution coverage that maximizes the efficiency of the existing heat transfer area.
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 ensures a sufficient heat transfer area regardless of the heat exchanger's orientation, reduces the device's size, and maintains performance without the need for additional pumping systems, thereby improving cooling and evaporating efficiency.
Implementation Method 1
a rotor including a hollow rotary shaft member (36) including a first internal flow path (36a) through which a solution including an absorbing liquid or a refrigerant flows, and that discharges the solution in the first internal flow path (36a) by a centrifugal force as the rotary shaft member (36) rotates
Data Source
AI summary
An absorption heat pump device includes a heat exchange unit through which a heat exchange fluid flows, a rotor that includes a hollow rotary shaft member including a first internal flow path and discharges a solution in the first internal flow path by a centrifugal force, and an application member that moves with rotation of the rotor to apply the solution, which flows through the first internal flow path and is discharged, along a heat transfer surface of the heat exchange unit.