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CN-122015532-A - Serpentine heat exchange tube with composite enhanced heat transfer structure and photovoltaic/photo-thermal system

CN122015532ACN 122015532 ACN122015532 ACN 122015532ACN-122015532-A

Abstract

The invention relates to a snake-shaped heat exchange tube with a compound enhanced heat transfer structure and a photovoltaic/photo-thermal system, wherein two opposite sides in the heat exchange tube are respectively provided with a first corrugated base surface and a second corrugated base surface along the axial direction, the first corrugated base surfaces and the second corrugated base surfaces have the same structure and are symmetrically distributed, and form a contracted section flow passage with a reduced cross section area and an expanded section flow passage with an increased cross section area which are alternately connected in turn, the first corrugated base surface is provided with a first inner tube fin, the second corrugated base surface is provided with a second inner tube fin, the first inner tube fin and the second inner tube fin have the same structure and are symmetrically distributed at intervals, and the end face of the first inner tube fin is higher than the trough of the first corrugated base surface. Compared with the prior art, the invention solves the problem that the heat transfer and the resistance of the traditional single reinforced structure are difficult to balance, and the comprehensive heat efficiency of the system is obviously improved.

Inventors

  • LIU BOWEN
  • YANG FANG
  • Hang En

Assignees

  • 上海工程技术大学

Dates

Publication Date
20260512
Application Date
20260119

Claims (10)

  1. 1. The utility model provides a snakelike heat exchange tube with compound heat transfer structure that reinforces, its characterized in that, the both sides that are relative in the snakelike heat exchange tube are equipped with first ripple basal plane (111) and second ripple basal plane (112) respectively along the axial, first ripple basal plane (111) and second ripple basal plane (112) structure are the same, and symmetrical distribution to constitute shrink section runner (113) that the cross-sectional area reduces and expansion section runner (114) that the cross-sectional area increases that connect alternately in proper order, be equipped with first intraductal fin (101) on first ripple basal plane (111), be equipped with second intraductal fin (102) on second ripple basal plane (112), first intraductal fin (101) and second intraductal fin (102) structure are the same, and symmetrical interval distribution, the terminal surface of first intraductal fin (101) is higher than the trough of first ripple basal plane (111).
  2. 2. A serpentine heat exchange tube with a composite enhanced heat transfer structure according to claim 1, wherein the first in-tube fin (101) is disposed on the centerline of the first corrugated base (111) and the second in-tube fin (102) is disposed on the centerline of the second corrugated base (112).
  3. 3. A serpentine heat exchange tube with a composite enhanced heat transfer structure according to claim 1, wherein the number of the first tube inner fins (101) is plural, and each of the first tube inner fins (101) is parallel to each other and uniformly distributed in the width direction of the first corrugated base (111).
  4. 4. A serpentine heat exchange tube with a composite enhanced heat transfer structure according to claim 1, wherein the width of the first tube inner fin (101) is 0.2-0.8mm and the height of the first tube inner fin (101) is 2.0-3.5mm.
  5. 5. A serpentine heat exchange tube with a composite enhanced heat transfer structure according to claim 1, wherein the height of the corrugations of the first corrugated base (111) is 1-3mm and the pitch of the corrugations of the first corrugated base (111) is 75-300mm.
  6. 6. The serpentine heat exchange tube with a composite enhanced heat transfer structure of claim 1, wherein an outer surface of the serpentine heat exchange tube is roughened for enhancing heat absorption capacity of the serpentine heat exchange tube.
  7. 7. A photovoltaic/photo-thermal system, characterized by comprising a serpentine heat exchange tube with a composite enhanced heat transfer structure according to any one of claims 1-6, the system further comprising a photovoltaic photo-thermal plate (1), a heat absorbing aluminum back plate (6) and a heat insulating sponge (8) stacked in sequence from top to bottom, wherein the serpentine heat exchange tube is arranged between the heat absorbing aluminum back plate (6) and the heat insulating sponge (8) in an S-shaped curve.
  8. 8. A photovoltaic/photo-thermal system according to claim 7, characterized in that the system further comprises a photovoltaic photo-thermal plate (1) comprising a glass cover plate (2), an air interlayer (3) and a solar cell photovoltaic module (4) stacked in sequence from top to bottom, the solar cell photovoltaic module (4) being abutted against the side of the heat absorbing aluminium back plate (6) remote from the insulating sponge (8).
  9. 9. A photovoltaic/photo-thermal system according to claim 8, characterized in that the solar cell photovoltaic module (4) is adhesively encapsulated by two EVA films (5).
  10. 10. A photovoltaic/photothermal system according to claim 7, characterized in that the number of photovoltaic photo-thermal plates (1) is plural, each photovoltaic photo-thermal plate (1) being connected in parallel after being connected in series.

Description

Serpentine heat exchange tube with composite enhanced heat transfer structure and photovoltaic/photo-thermal system Technical Field The invention relates to the technical field of heat exchangers, in particular to a serpentine heat exchange tube with a compound enhanced heat transfer structure and a photovoltaic/photo-thermal system. Background The photovoltaic/photo-thermal (PV/T) technology can obtain electric energy and heat energy at the same time, so that the problem of reduction of power generation efficiency caused by temperature rise of the traditional photovoltaic module is remarkably solved, and the photovoltaic/photo-thermal (PV/T) technology is a key way for realizing full-spectrum efficient utilization of solar energy. In the PV/T system, the serpentine heat exchange tube is used as a core component of the heat absorption plate, and the heat exchange capacity of the fluid in the serpentine heat exchange tube directly determines the cooling effect of the photovoltaic cell and the quality of heat recovery. As a core technology for comprehensive utilization of solar energy, a photovoltaic/photo-thermal (PV/T) system needs to be used for both photovoltaic power generation and photo-thermal conversion efficiency. The invention discloses a PVT heat collector, which comprises an aluminum alloy frame, toughened glass, EVA, a photovoltaic cell piece, ultrathin EVA, a plate core, an insulation layer and a back plate which are arranged from top to bottom and are fixed in the aluminum alloy frame, wherein the toughened glass, the EVA, the photovoltaic cell piece, the ultrathin EVA and the plate core are heated and laminated into a whole, the upper surface of the plate core is coated with a selective absorption coating, a thermal circulation device is further arranged between the plate core and the back plate, the thermal circulation device is tightly attached to the back surface of the plate core, and the insulation layer is filled around the thermal circulation device. The traditional PV/T system mostly adopts a single enhanced heat transfer structure, and comprises an independent light pipe, a simple fin or a corrugated pipe, and the utility model with the publication number of CN215982806U discloses that the heat pipe type photovoltaic/photo-thermal module is combined with a floor, so that the problem of temperature non-uniformity of a large building caused by glass curtain wall design is solved by utilizing a combined structure of the heat pipe and a phase change material, the uniform distribution and energy saving effect of heat are realized, and the heat supply duration is prolonged. And the utility model application with publication number CN111219887A discloses a heat exchange system which forms a circulating air layer and a micro-channel heat absorbing plate by using upward and downward corrugated pipes in a photovoltaic photo-thermal composite device, and supplies heat to the outside through heat transfer fluid, thereby improving the utilization rate of solar energy and saving the consumption of conventional energy. However, the heat exchange tube disclosed by the system has the problems that the heat transfer efficiency and the flow resistance are difficult to balance, the multi-parameter coupling is complex, and the like. In the prior art, the corrugated flow channel can enhance turbulence disturbance, but has insufficient local fitting degree, and the fin structure can expand the heat exchange area, but can easily cause abrupt increase of flow resistance. Furthermore, single structure optimization lacks systematicness and is difficult to achieve global optimality. Therefore, a compound enhanced heat transfer structure combining corrugated flow channels and fins is needed, and the bottleneck of the prior art is broken through multi-parameter collaborative optimization. Disclosure of Invention The invention aims to overcome the defects that the prior art has insufficient local fitting degree of a corrugated runner and the fin structure is easy to cause abrupt increase of flow resistance, and provides a serpentine heat exchange tube with a compound enhanced heat transfer structure and a photovoltaic/photo-thermal system. The aim of the invention can be achieved by the following technical scheme: In one aspect, the present scheme provides a serpentine heat exchange tube with compound enhancement heat transfer structure, the both sides that are opposite in the serpentine heat exchange tube are equipped with first ripple basal plane and second ripple basal plane along the axial respectively, first ripple basal plane and second ripple basal plane structure are the same, and symmetrical distribution to constitute the shrink section runner that the cross-sectional area that alternately connects in proper order reduces and the expansion section runner that the cross-sectional area increases, be equipped with first intraductal fin on the first ripple basal plane, be equipped with second intraductal fin o