A non-equal pitch multi-layer microchannel heat exchanger

By combining non-equidistant multi-layer microchannel design with spindle-shaped fins, the problems of thermal boundary layer thickening and bubble removal in microchannel radiators are solved, achieving efficient heat transfer and flow uniformity, and improving the overall performance of the heat exchanger.

CN121297539BActive Publication Date: 2026-06-23HANGZHOU INTERNATIONAL INNOVATION INSTITUTE OF BEIHANG UNIVERSITY +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HANGZHOU INTERNATIONAL INNOVATION INSTITUTE OF BEIHANG UNIVERSITY
Filing Date
2025-11-25
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

Existing microchannel radiators are prone to thermal boundary layer thickening due to insufficient disturbance during flow, resulting in increased condensate temperature, reduced heat exchange efficiency, uneven flow leading to localized high-temperature hot spots, and large bubbles generated by the phase change of the condensate are difficult to remove.

Method used

Design a non-equidistant multilayer microchannel heat exchanger, including an outer layer, a middle layer and an inner layer of microchannels. Each layer is equipped with spindle-shaped fins to enhance flow through lateral and longitudinal disturbances. A group of interconnecting holes is used to divide bubbles, promote uniform flow, and quickly dissipate heat.

Benefits of technology

Maintaining a large temperature difference on the wall surface enhances turbulence, improves heat transfer efficiency, reduces flow resistance, inhibits bubble formation, and enhances heat transfer performance at low Reynolds numbers.

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Abstract

This invention discloses a non-equidistant multilayer microchannel heat exchanger, relating to the field of heat exchanger technology. It includes a shell and at least three microchannel layers. One end of the shell has a main inlet and at least one outlet, while the other end is a heat source contact surface. The shell contains a cavity, with the main inlet and outlet both connected to the cavity. Within the cavity, each microchannel layer is sequentially an outer layer, a middle layer, and an inner layer, with the inner layer adjacent to the heat source. The outer layer has a higher layer height than the middle layer, which in turn is higher than the inner layer. A central main flow inlet is connected to the main inlet of each layer and to the corresponding main inlet of each layer. The cooling medium flows from the main inlet into the central main flow inlet of the outer layer via a distributor. Each layer's end is connected to a corresponding outlet. Connecting holes are provided on both sides of the central main flow inlet between each layer. Multiple spindle-shaped fins are fixed to the upper, lower, and inner walls of each layer. The number of fins is the same in each layer, but their arrangement differs. The pressure drop of the outer microchannel is less than that of the middle layer, which is less than that of the inner layer. This design maintains a larger temperature difference with the wall surface, enhances turbulence, and improves heat exchange efficiency.
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