US20200284530A1 - Plate-fin heat exchanger core and fin structure thereof - Google Patents

Plate-fin heat exchanger core and fin structure thereof Download PDF

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Publication number
US20200284530A1
US20200284530A1 US16/811,271 US202016811271A US2020284530A1 US 20200284530 A1 US20200284530 A1 US 20200284530A1 US 202016811271 A US202016811271 A US 202016811271A US 2020284530 A1 US2020284530 A1 US 2020284530A1
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United States
Prior art keywords
fin
perforated
plate
heat exchanger
protrusion
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Abandoned
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US16/811,271
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English (en)
Inventor
Bofeng BAI
Mengjie CHEN
Binbin PEI
Mengmeng YUE
Zhentao CHEN
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Xian Jiaotong University
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Xian Jiaotong University
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Assigned to XI'AN JIAOTONG UNIVERSITY reassignment XI'AN JIAOTONG UNIVERSITY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BAI, BOFENG, CHEN, Mengjie, CHEN, ZHENTAO, PEI, Binbin, YUE, MENGMENG
Publication of US20200284530A1 publication Critical patent/US20200284530A1/en
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • F28F3/025—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being corrugated, plate-like elements
    • F28F3/027—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being corrugated, plate-like elements with openings, e.g. louvered corrugated fins; Assemblies of corrugated strips
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0062—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by spaced plates with inserted elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2215/00—Fins
    • F28F2215/10—Secondary fins, e.g. projections or recesses on main fins

Definitions

  • the present invention relates to the technical field of plate-fin heat exchangers, and in particular, to a plate-fin heat exchanger core.
  • plate-fin heat exchangers have compact and firm structure, high heat transfer efficiency, light weight, high flexibility and high adaptability. Their heat transfer coefficient is 5-8 times higher than that of shell-and-tube heat exchangers, weight is 80% lower than that of shell-and-tube heat exchangers, and heat transfer area density is 6-10 times that of shell-and-tube heat exchangers. Plate-fin heat exchangers are widely used in petrochemical, aerospace, military, shipbuilding, refrigeration and other fields, and have achieved significant economic benefits in utilizing thermal energy, recovering waste heat, saving raw materials and reducing costs, etc.
  • the plate-fin heat exchanger is composed of heat exchange fin, partition plate, sealing strip, distributing fin, end plate, header and fluid inlet and outlet nozzles.
  • the plate-fin heat exchanger core includes partition plate, fin and sealing strip. The fins are supported by the partition plates, and adjacent partition plates are sealed by the sealing strip.
  • the repeating units are stacked and connected by diffusion welding or brazing into a whole. A major part of heat transfer between the hot and cold fluids in the channel is completed through the fin structure between the partition plates, while a minor part is completed through the partition plates. Since the fins cannot directly exchange heat, they are called “the secondary surfaces”.
  • the fins have various structural forms such as offset strip fins, wavy fins, straight fins, porous fins, louvered fins and pin fins.
  • the plate-fin heat exchanger can improve heat transfer by means of increasing the heat exchange area and turbulence intensity.
  • the dimple/protrusion fin structure is used to increase the heat exchange area and form a turbulent effect, so as to generate vortexes and secondary flow and make the flow boundary layer develop continuously. In this way, the dimple/protrusion fin structure achieves the purpose of enhancing heat transfer.
  • a recirculation zone is formed behind the turbulence, which locally weakens the heat transfer at the rear side of protrusion and inner front side of the dimple and significantly increases the flow resistance.
  • porous plate-fin structure (CN104390508).
  • CN104390508 When the fluid flows near the pore, lateral mixing occurs to thin the boundary layer.
  • the flow resistance of the porous plate-fin increases as the porous rate increases with ignorable change in heat transfer
  • the heat exchange area is reduced, and the comprehensive heat transfer performance is not significantly improved.
  • the pore structure weakens the strength of the plate-fin heat exchanger and reduces the pressure resistance of the plate-fin structure.
  • the optimization is significant for improving the comprehensive heat transfer efficiency of the plate-fin heat exchanger, reducing the flow resistance of the plate-fin heat exchanger, achieving energy saving and reducing consumption, and reducing enterprise production costs.
  • an objective of the present invention is to provide a plate-fin heat exchanger core and a fin structure thereof.
  • the present invention further improves the compactness and comprehensive heat transfer efficiency of the plate-fin heat exchanger.
  • a fin structure where the fin is provided with a plurality of dimples/protrusions; the dimple/protrusion is provided with a perforated hole to form a perforated dimple/protrusion.
  • a hole on the perforated dimple and the perforated protrusion can be located at a center of the corresponding perforated dimple/perforated protrusion.
  • a hole on the perforated dimple and the perforated protrusion can have an offset from the center of the corresponding perforated dimple/perforated protrusion.
  • an offset hole on the perforated protrusion can be located on an inflowing leeward side and an offset hole on the perforated dimple can be located on an inflowing side.
  • the hole on the perforated dimple/protrusion can be circular.
  • the fin can be a straight, wavy or offset strip fin.
  • the heat exchanger core includes a plurality of partition plates and a fin, where the fin is supported and fixed between two adjacent partition plates; the two adjacent partition plates are sealed to form a fluid channel unit; the fluid channel unit forms a plurality of heat exchange channels for a medium to flow between the adjacent partition plates.
  • the plate-fin heat exchanger core can include a plurality of fluid channel units stacked and fixed together.
  • adjacent fluid channel units can share one partition plate.
  • the perforated dimple and the perforated protrusion are staggered on both sides in the heat exchange channel; the two sides of the fin channel have a perforated protrusion structure, a perforated dimple structure, or a perforated dimple/protrusion mixed structure.
  • the plate-fin heat exchanger core can be composed of a partition plate, a perforated dimple/protrusion fin and a sealing strip. Adjacent fins can be supported by the partition plate, and adjacent partition plates can be sealed with the sealing strip to form an impervious fluid channel.
  • the fluid channel can realize the flow of different fluid and the flow of downflow, counterflow, cross flow of different fin layers.
  • the fin structure of the plate-fin heat exchanger core mainly combines the structural characteristics of porous and dimple/protrusion fins.
  • different positions of the hole on the perforated dimple/protrusion structure are punched.
  • the hole includes non-offset hole and offset hole.
  • the hole offset is located on an inflowing leeward side of the perforated protrusion structure and on a windward side of the perforated dimple structure.
  • the perforated dimple/protrusion structure of the fin is staggered on both sides in the channel.
  • the two sides of the fin channel have perforated protrusion structure, perforated dimple structure, or perforated dimple/protrusion mixed structure.
  • the versatile fin can also be combined with other types of fins.
  • the fin of the plate-fin heat exchanger is mainly formed by punching on a rectangular plate to form a perforated dimple/protrusion structure and rolling.
  • the perforated dimple/protrusion fin structure is “the secondary surface”, which increases a heat exchange area, enhances fluid turbulence, destroys a boundary layer, effectively reduces flow resistance, and has a significantly enhanced heat transfer.
  • the fin of the plate-fin heat exchanger mainly has the following structural parameters: L is fin length; W is fin width; R is radius of dimple/protrusion; h f . fin height; d is diameter of hole structure; ⁇ is fin thickness; S is fin spacing; C f is horizontal distance between adjacent perforated dimple/protrusion; e is vertical distance between adjacent perforated dimple and perforated protrusion; bf is distance from perforated dimple/protrusion structure to fin edge; and a is hole offset.
  • the present invention has the following beneficial effects.
  • the present invention has the following advantages.
  • the present invention efficiently utilizes the effective heat transfer area of the fin, effectively reduces the flow resistance of the plate-fin heat exchanger while enhancing the turbulence, and improves the comprehensive heat transfer efficiency of the plate-fin heat exchanger.
  • the present invention reduces the recirculation zone of the dimple/protrusion fin structure, and improves the local enhanced heat transfer coefficient of the dimple/protrusion fin.
  • the present invention obviously improves the heat exchange performance of the porous fin and the pressure-bearing capacity of the porous fin.
  • the present invention improves the compactness of the plate-fin heat exchanger, reduces the weight, and saves the manufacturing cost.
  • FIG. 1 is a structural diagram of an embodiment of a plate-fin heat exchanger core
  • FIG. 2 is a distribution diagram of an embodiment of adjacent fluid channels of a fin of a plate-fin heat exchanger
  • FIG. 3 is a comprehensive diagram of an embodiment of a non-offset perforated dimple/protrusion fin of a plate-fin heat exchanger
  • FIG. 4 is a front view of an embodiment a non-offset perforated dimple/protrusion fin of a plate-fin heat exchanger
  • FIG. 5 is a side view of an embodiment of a non-offset perforated dimple/protrusion fin of a plate-fin heat exchanger
  • FIG. 6 is a comprehensive diagram of an embodiment of a perforated dimple/protrusion fin of a plate-fin heat exchanger with an offset a;
  • FIG. 7 is a rear view of an embodiment of a perforated dimple/protrusion fin of a plate-fin heat exchanger with an offset a;
  • FIG. 8 is a front view of an embodiment of a perforated dimple/protrusion fin of a plate-fin heat exchanger with an offset a;
  • FIG. 9 is a structural diagram of an embodiment of a perforated dimple/protrusion fin of a plate-fin heat exchanger with an offset a;
  • FIG. 10 is an outside view of an embodiment of a plate-fin heat exchanger
  • FIG. 11 is a comparison diagram of an embodiment of a Nusselt number Nu in the flow heat transfer performance of a plate-fin heat exchanger of the present invention, a dimple/protrusion fin and a straight fin;
  • FIG. 12 is a comparison diagram of an embodiment of a resistance coefficient f in the flow heat transfer performance of plate-fin heat exchanger of the present invention, a dimple/protrusion fin and a straight fin.
  • 1 is partition plate
  • 2 is perforated protrusion
  • 3 is perforated dimple
  • 4 is hot fluid channel
  • 5 is cold fluid channel
  • 6 is partition plate
  • 7 is sealing strip
  • 8 is offset perforated protrusion
  • 9 is header
  • 10 is side plate.
  • the present invention provides a plate-fin heat exchanger core, including a plurality of partition plates ( 1 , 6 ), a fin 100 and a sealing strip 7 . Fins 100 are mutually supported by two corresponding partition plates ( 1 , 6 ). Adjacent partition plates ( 1 , 6 ) are sealed with the sealing strip 7 to form a hot fluid channel 4 /cold fluid channel 5 .
  • a plurality of fluid channels are stacked and connected by diffusion welding or brazing to form the plate-fin heat exchanger core. The fluid channel realizes the flow of different fluid and the flow of down-flow, counterflow, cross flow of different fin layers.
  • the fin 100 is mainly composed of a fluid channel of a perforated protrusion 2 /perforated dimple 3 structure.
  • a hole 200 includes a non-offset hole and a hole with an offset a.
  • the perforated dimple/protrusion structure is staggered on both sides of the channel, and a fluid flows through the perforated protrusion 2 /perforated dimple 3 structure.
  • the perforated dimple/protrusion structure enhances turbulence, destroys a boundary layer, effectively reduces a recirculation zone of the dimple/protrusion structure, and reduces flow resistance. Therefore, the fin structure improves the comprehensive performance of the plate-fin heat exchanger.
  • the fin channel of the plate-fin heat exchanger has a variety of structural forms such as straight fin, wavy fin and offset strip fin to improve the heat exchange structure, effectively reduce the flow resistance and achieve enhanced heat transfer.
  • the two sides of the fin channel have a variety of structural forms such as the perforated protrusion 2 structure, the perforated dimple 3 structure and the perforated dimple/protrusion mixed structure.
  • the versatile perforated dimple/protrusion fin can be combined with other types of fins to achieve the best heat transfer performance under different working conditions.
  • the plate-fin heat exchanger core of the present invention combines the advantages of the dimple/protrusion structure and the porous structure.
  • the fin increases a heat exchange area, and the dimple/protrusion structure improves the pressure-bearing capacity of the plate-fin structure and improves fluid turbulence, thinning a flow boundary layer and a hot boundary layer.
  • the hole structure forms a local jet to promote mixed convection of a fluid in the adjacent fluid channels of the fin, and reduces a recirculation zone of the dimple/protrusion structure, achieving enhanced heat transfer and reducing flow resistance.
  • the plate-fin heat exchanger core is sealed by an end plate 10 and a header 9 to form the plate-fin heat exchanger.
  • FIG. 11 and FIG. 12 which provide a comparison of the flow heat transfer performance of the plate-fin heat exchanger of the present invention, a dimple/protrusion fin and a straight fin.
  • FIG. 11 shows that compared with the existing dimple/protrusion fin and straight fin, the fin of the present invention has a larger Nusselt number Nu under the same conditions.
  • FIG. 12 shows that compared with the existing dimple/protrusion fin and straight fin, the fin of the present invention has a smaller resistance coefficient f under the same conditions. Therefore, the plate-fin heat exchanger of the present invention has better flow heat transfer performance.
US16/811,271 2019-03-08 2020-03-06 Plate-fin heat exchanger core and fin structure thereof Abandoned US20200284530A1 (en)

Applications Claiming Priority (2)

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CN201910174617.8 2019-03-08
CN201910174617.8A CN109883238A (zh) 2019-03-08 2019-03-08 一种板翅式热交换器芯体及其翅片结构

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Cited By (4)

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CN112503971A (zh) * 2020-12-07 2021-03-16 西安交通大学 一种异形颗粒有序堆积换热装置
US11039550B1 (en) * 2020-04-08 2021-06-15 Google Llc Heat sink with turbulent structures
CN114264185A (zh) * 2021-11-09 2022-04-01 河北宇天材料科技有限公司 一种密集型微孔换热器翅片
CN114753933A (zh) * 2022-06-15 2022-07-15 中国空气动力研究与发展中心设备设计与测试技术研究所 一种叶脉仿生主动冷却流道结构

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CN113865383A (zh) * 2020-06-30 2021-12-31 中国科学院广州能源研究所 一种板翅式空冷器结构及空冷器
CN112886097A (zh) * 2021-02-02 2021-06-01 浙江银轮机械股份有限公司 换热板及电池包
CN113465437B (zh) * 2021-06-24 2023-01-24 中原工学院 一种百叶窗翅片换热器、及其性能评价因子确定方法
CN113374545A (zh) * 2021-06-27 2021-09-10 西北工业大学 一种基于阵列环形凸起靶板的冲击冷却结构
CN113883930B (zh) * 2021-09-30 2022-10-28 西安交通大学 一种间壁式换热器及应用

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TW201118329A (en) * 2009-11-23 2011-06-01 Sunnystone Technology Inc Radiating fin
CN102645118B (zh) * 2012-05-07 2013-12-25 华北电力大学 一种利用冲孔射流提高涡发生器强化换热效果的方法
CN203758340U (zh) * 2014-02-18 2014-08-06 浙江银轮机械股份有限公司 波纹形热交换器翅片
WO2016015324A1 (zh) * 2014-08-01 2016-02-04 王良璧 管翅式换热器流线型波纹翅片
CN204301586U (zh) * 2014-11-05 2015-04-29 中国船舶重工集团公司第七�三研究所 多孔波纹翅片型板翅换热器
CN207163297U (zh) * 2017-09-09 2018-03-30 郑州大学 新型板翅式换热器翅片
CN208547282U (zh) * 2018-07-04 2019-02-26 陕西观能机电科技有限公司 一种冷却器用低延阻半圆形凸痕翅片

Cited By (5)

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US11039550B1 (en) * 2020-04-08 2021-06-15 Google Llc Heat sink with turbulent structures
US11574850B2 (en) 2020-04-08 2023-02-07 Google Llc Heat sink with turbulent structures
CN112503971A (zh) * 2020-12-07 2021-03-16 西安交通大学 一种异形颗粒有序堆积换热装置
CN114264185A (zh) * 2021-11-09 2022-04-01 河北宇天材料科技有限公司 一种密集型微孔换热器翅片
CN114753933A (zh) * 2022-06-15 2022-07-15 中国空气动力研究与发展中心设备设计与测试技术研究所 一种叶脉仿生主动冷却流道结构

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