CN209894019U - Efficient finned heat exchanger for low-temperature heat pump - Google Patents

Efficient finned heat exchanger for low-temperature heat pump Download PDF

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CN209894019U
CN209894019U CN201920745994.8U CN201920745994U CN209894019U CN 209894019 U CN209894019 U CN 209894019U CN 201920745994 U CN201920745994 U CN 201920745994U CN 209894019 U CN209894019 U CN 209894019U
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aluminum foil
heat exchanger
pipe sleeve
fin
heat pump
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CN201920745994.8U
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赵文静
赵连赫
赵军周
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赵军周
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Abstract

The utility model provides a high-efficiency finned heat exchanger for a low-temperature heat pump, which comprises a copper pipe, an aluminum foil fin, a left support plate, a right support plate and a connecting rod; the aluminum foil fin is provided with a flanging flange pipe sleeve and a through hole; a plurality of groups of aluminum foil fins are arranged between the left supporting plate and the right supporting plate in parallel, the connecting rod penetrates through the through holes of the aluminum foil fins, two ends of the connecting rod are fixedly connected with the left supporting plate and the right supporting plate respectively, the copper pipe penetrates through the flanging flange pipe sleeve of the aluminum foil fins, and the copper pipe and the pipe sleeve are in close contact through an expansion joint process; and graphene coatings are coated on the front surface and the back surface of the aluminum foil fin, the inner surface and the outer surface of the flanging flange pipe sleeve and the outer surface of the copper pipe. Utilize graphite alkene's good heat conductivility, super hydrophobic property and good mechanical properties to through the thickness of optimizing graphite alkene layer and aluminium foil fin's interval layer parameter, make the frost layer thickness of heat exchanger reduce, change the frost speed and accelerate, heat exchange efficiency obviously improves, the protection through graphite alkene layer still can prolong the life of heat exchanger, consequently the utility model discloses have stronger practicality strong and very big spreading value.

Description

Efficient finned heat exchanger for low-temperature heat pump
Technical Field
The utility model belongs to the technical field of the heat exchanger, concretely relates to a high-efficient finned heat exchanger for low temperature heat pump.
Background
The fin heat exchanger is a device for transferring part of heat of a hot fluid to a cold fluid, and is also called a heat exchanger. The heat exchanger plays an important role in chemical industry, petroleum industry, power industry, heat pumps and other industrial production, and the heat exchanger is a core component of a heat pump unit in heat pump production and directly influences the operation efficiency of the heat pump unit. The traditional fin heat exchanger adopts metal copper and aluminum foil as heat conduction materials, and the heat conduction capability of the traditional fin heat exchanger is limited, so that the heat exchange efficiency of the heat exchanger is influenced.
The low-temperature air source heat pump is one of the most energy-saving modes for heating in winter at present, absorbs heat in air when the low-temperature air source heat pump works, converts the heat into high-temperature heat energy after being compressed by a compressor, and transmits the heat to circulating water through a fin heat exchanger so as to improve the water temperature for people to heat and utilize. At present, when a low-temperature air source heat pump unit adopting a traditional fin heat exchanger is used for heating operation in cold or severe cold climate, the heat generated by the low-temperature air source heat pump unit is reduced along with the reduction of the outdoor environment temperature; meanwhile, the low-temperature heat pump unit can be subjected to frequent frosting and defrosting, or incomplete defrosting, even serious heating attenuation, so that the unit fails to operate normally.
Disclosure of Invention
The shortcoming that exists to above-mentioned prior art, the utility model provides a high-efficient finned heat exchanger solves the frequent frosting that exists of heat pump set when heating operation under the low temperature environment winter and changes the frost, change the frost time long, the heat exchange efficiency low scheduling problem.
The technical scheme of the utility model as follows: a high-efficiency finned heat exchanger for a low-temperature heat pump comprises a copper pipe, aluminum foil fins, a left support plate, a right support plate and a connecting rod; the aluminum foil fin is provided with a flanging flange pipe sleeve and a through hole; a plurality of groups of aluminum foil fins are arranged between the left supporting plate and the right supporting plate in parallel, the connecting rod penetrates through the through holes of the aluminum foil fins, two ends of the connecting rod are fixedly connected with the left supporting plate and the right supporting plate respectively, the copper pipe penetrates through the flanging flange pipe sleeve of the aluminum foil fins, and the copper pipe and the pipe sleeve are in close contact through an expansion joint process; and graphene coatings are coated on the front surface and the back surface of the aluminum foil fin, the inner surface and the outer surface of the flanging flange pipe sleeve and the outer surface of the copper pipe.
Furthermore, the thickness of the graphene coating is 0.03-0.06 mu m.
Furthermore, the height of the flange pipe sleeve is 1.30-1.81mm, and the distance between two adjacent groups of aluminum foil fins is the same as the height of the flange pipe sleeve.
Further, the thickness of the aluminum foil fin is 0.115 mm.
Has the advantages that: the utility model discloses an at aluminium foil fin's positive and negative two sides, the internal surface and the surface of turn-ups flange pipe box, and the surface of copper pipe all scribble the graphite alkene coating, utilize graphite alkene's good heat-conduction performance, super hydrophobic performance and good mechanical properties to through the thickness of optimizing graphite alkene layer and aluminium foil fin's interval layer parameter, make the frost layer thickness of heat exchanger reduce, change the frost speed and accelerate, heat exchange efficiency obviously improves, the protection through graphite alkene layer still can prolong the life of heat exchanger, consequently the utility model discloses have stronger practicality strong and very big spreading value.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic diagram (a side view, b perspective view, c front view) of the aluminum foil fin in different viewing angles.
Fig. 3 is a schematic view of a partial cross-sectional coating of an aluminum foil fin.
In the figure: 1. a copper pipe; 2. aluminum foil fins; 21. a flanged flange sleeve; 22. perforating; 23. a graphene coating; 3. a left support plate; 4. a right support plate; 5. a connecting rod.
Detailed Description
In order to make the technical means, technical characteristics, achievement purposes and effects of the utility model easy to understand and understand
The present invention will be further explained with reference to the drawings.
As shown in fig. 1, a high-efficiency finned heat exchanger for a low-temperature heat pump comprises a copper pipe 1, an aluminum foil fin 2, a left support plate 3, a right support plate 4 and a connecting rod 5; a plurality of groups of aluminum foil fins 2 are arranged between the left support plate 3 and the right support plate 4 in parallel; as shown in fig. 2, a plurality of flanging flange pipe sleeves 21 and through holes 22 are arranged on the aluminum foil fin 2, and the height of the flanging flange pipe sleeves 21 is 1.30-1.81 mm; the connecting rod 5 penetrates through the through holes 22 of the multiple groups of aluminum foil fins, two ends of the connecting rod 5 are fixedly connected with the left supporting plate 3 and the right supporting plate 4 respectively, the copper pipe 1 penetrates through the flanging flange pipe sleeve 21 of the aluminum foil fins, and the copper pipe 1 and the pipe sleeve 21 are in tight contact through an expansion joint process; as shown in fig. 3, graphene coatings 23 are coated on the front and back surfaces of the aluminum foil fin 2 and the inner surface and the outer surface of the flange-flanged pipe sleeve 21, and a graphene coating is also coated on a contact part of the outer surface of the copper pipe 1 and the flange-flanged pipe sleeve 21, the thickness of the graphene heat conduction layer directly affects the heat conduction coefficient, and the thickness of the graphene coating is selected to be 0.03-0.06 μm. The distance between the aluminum foil fins directly influences the air side flow velocity and the wind resistance, the selection of the aluminum foil distance considers the optimal proportion of the pressure drop and the heat exchange quantity of the air side, the distance between two adjacent groups of aluminum foil fins is the same as the height of the flanging flange pipe sleeve, and the thickness of the aluminum foil fins is selected to be 0.115 mm.
The utility model forms a layer of graphene coating on the surface of the aluminum foil by coating a layer of graphene mixed solution on the front and back surfaces of the aluminum foil fin; the main component of the graphene mixed solution is graphene mother liquor; silica, alumina; polymethacrylate, polyvinyl alcohol, water and ethyl acetate; preparing a graphene mixed solution according to the weight ratio. And coating the graphene mixed solution on the surface of the aluminum foil, and drying and curing in a drying furnace to form a graphene layer.
The graphene has very good heat conduction performance, and the heat conduction coefficient of the graphene is as high as 5300W/mK due to the fact that the mass of the graphene heat conduction layer is smaller than that of the heat conduction layer of a common metal material product, the graphene heat conduction layer is extremely good, the graphene is a carbon material with the highest heat conduction coefficient so far, and the heat exchange efficiency of the fin heat exchanger can be obviously improved by utilizing the thermal performance of the graphene.
Meanwhile, the super-hydrophobicity of graphene can be utilized: when the heat pump unit frosts in winter, the thickness of a frost layer on the surface of the heat exchanger can be reduced; when the heat pump unit defrosts in winter, the thickness of a water film on the surface of the heat exchanger is reduced, so that water in the defrosting process is separated from the graphene heat conduction layer instantly; therefore, the problem of the largest frost formation in the heat pump industry is solved, incomplete defrosting or incomplete defrosting is realized, the frost formation is less, the defrosting is short, and the comprehensive energy efficiency of the low-temperature heat pump of the heat exchanger can be improved.
Finally, by utilizing the excellent mechanical properties of graphene, the graphene is one of the materials with the highest known strength, has good toughness and can be bent, the theoretical Young modulus of the graphene reaches 1.0TPa, and the inherent tensile strength is 130 GPa. After the aluminum foil is coated with the graphene coating, the fundamental problem that the service life of a heat pump unit is shortened due to the fact that the fin heat exchanger is corroded in the heat pump industry because the fin heat exchanger is subjected to weather such as solar irradiation and acid rain for a long time can be solved, and the service life of a heat pump product is prolonged.
To verify the effect of the heat exchanger coated with graphene coating, we performed comparative experiments: the heat exchanger products of the same type with and without the graphene coating are subjected to the third party (enthalpy difference laboratory) comparative test as follows: the method adopts the national standard GB/T GB/T25127.1-2010, namely the part 1 of the low-environment-temperature air source heat pump (cold water) unit: heat pump (chiller) units for industrial or commercial use and similar uses and GB/T25127.2-2010 low ambient temperature air source heat pump (chiller) unit part 2: the heat pump (cold water) unit for household and similar uses has the following test results:
(1) basic test data of a common heat exchanger:
outdoor temperature: -20.12 ℃, outdoor humidity: 64.12%, heating capacity: 31.05kw, heating efficiency: 1.45, power: 21.525kw, water temperature: 49.92 ℃, defrosting time: 480S, namely 8 minutes;
(2) basic test data of the graphene heat exchanger:
outdoor temperature: -20.05 ℃, outdoor humidity: 64.71%, heating capacity: 34.38kw, heating efficiency: 1.48, power: 23.29kw, water temperature: 49.97 ℃, defrosting time: 300S, i.e. 5 minutes.
The test data can obviously show that the heat exchange quantity, the heat exchange efficiency and the defrosting time of the heat exchanger with the graphene coating are superior to those of the parameters of a common heat exchanger.
The utility model discloses a coating graphite alkene coating at aluminium foil fin positive and negative to optimize coating thickness and other relevant parameters, make this finned heat exchanger's frosting layer thickness thin, change the frost time short, heat exchange efficiency is high, long service life, but the wide application has great practicality and spreading value in fields such as heat pump and air conditioner.

Claims (4)

1. The utility model provides a high-efficient finned heat exchanger for low temperature heat pump, includes copper pipe, aluminium foil fin, left support plate, right branch fagging, connecting rod, its characterized in that: the aluminum foil fin is provided with a flanging flange pipe sleeve and a through hole; a plurality of groups of aluminum foil fins are arranged between the left support plate and the right support plate in parallel; the connecting rod penetrates through the through holes of the multiple groups of aluminum foil fins, and two ends of the connecting rod are fixedly connected with the left supporting plate and the right supporting plate respectively; the copper pipe penetrates through the flanging flange pipe sleeve of the aluminum foil fin, and the copper pipe is tightly contacted with the pipe sleeve through an expansion joint process; and graphene coatings are coated on the front surface and the back surface of the aluminum foil fin, the inner surface and the outer surface of the flanging flange pipe sleeve and the outer surface of the copper pipe.
2. A high efficiency finned heat exchanger for a cryogenic heat pump according to claim 1 wherein: the thickness of the graphene coating is 0.03-0.06 mu m.
3. A high efficiency finned heat exchanger for a cryogenic heat pump according to claim 1 wherein: the height of the flange pipe sleeve is 1.30-1.81mm, and the distance between two adjacent groups of aluminum foil fins is the same as the height of the flange pipe sleeve.
4. A high efficiency finned heat exchanger for a cryogenic heat pump according to claim 1 wherein: the thickness of the aluminum foil fin is 0.115 mm.
CN201920745994.8U 2019-05-23 2019-05-23 Efficient finned heat exchanger for low-temperature heat pump Active CN209894019U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201920745994.8U CN209894019U (en) 2019-05-23 2019-05-23 Efficient finned heat exchanger for low-temperature heat pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201920745994.8U CN209894019U (en) 2019-05-23 2019-05-23 Efficient finned heat exchanger for low-temperature heat pump

Publications (1)

Publication Number Publication Date
CN209894019U true CN209894019U (en) 2020-01-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201920745994.8U Active CN209894019U (en) 2019-05-23 2019-05-23 Efficient finned heat exchanger for low-temperature heat pump

Country Status (1)

Country Link
CN (1) CN209894019U (en)

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