Heat exchanger, air conditioner and refrigerator including same

Abstract

A heat exchanger according to an embodiment comprises: a tube through which a refrigerant flows; a heat exchange fin coupled to a surface of the tube; a graphene sheet provided so as to be in contact with at least a portion of the heat exchange fin so that heat is conducted to the heat exchange fin, the graphene sheet including a graphene layer that is supplied with current and generates heat; and an electrode that is electrically connected to the graphene layer to apply current to the graphene layer.

Description

Heat exchangers, air conditioners and refrigerators containing the same

[0001] The present disclosure relates to a heat exchanger comprising graphene, and an air conditioner and a refrigerator comprising the same.

[0002] A heat exchanger is a device that exchanges heat between refrigerant and outside air, including tubes through which refrigerant flows and exchanges heat with outside air, heat exchange fins that contact the tubes to expand the heat dissipation area, and headers through which both ends of the tubes are connected.

[0003] The heat exchanger may comprise an evaporator or a condenser, a compressor for compressing refrigerant, and an expansion valve for expanding the refrigerant, forming a refrigeration cycle device.

[0004] An air conditioner can discharge warm or cold air through heat exchange between the refrigerant and outside air in an indoor heat exchanger. It can discharge cold or warm air through heat exchange between the refrigerant and outside air in an outdoor heat exchanger.

[0005] A refrigerator may include a heat exchanger, i.e., an evaporator, for supplying cold air to the storage compartment. The evaporator may cool air through heat exchange, and the cooled air may be supplied to the storage compartment.

[0006] One aspect of the present disclosure can provide a heat exchanger with improved energy efficiency without increasing the size of the heat exchanger, and an air conditioner and a refrigerator including the same.

[0007] One aspect of the present disclosure can provide a heat exchanger with improved heat exchange efficiency, and an air conditioner and a refrigerator including the same.

[0008] One aspect of the present disclosure may provide a heat exchanger with improved cooling efficiency, and an air conditioner and a refrigerator including the same.

[0009] The technical problems to be achieved in this document are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary skill in the technical field to which the present invention belongs from the description below.

[0010] A heat exchanger according to one embodiment comprises a tube through which a refrigerant flows, heat exchange fins bonded to a surface of the tube, a graphene sheet arranged to be in contact with at least a portion of the heat exchange fins so as to conduct heat to the heat exchange fins, the graphene sheet including a graphene layer that generates heat when supplied with current, and an electrode electrically connected to the graphene layer so as to apply current to the graphene layer.

[0011] An air conditioner according to one embodiment includes an outdoor unit having a compressor for compressing a refrigerant, an outdoor heat exchanger arranged to allow heat exchange between the refrigerant and air, an expansion valve for expanding the refrigerant discharged from the outdoor heat exchanger, and an indoor unit having an indoor heat exchanger arranged to allow heat exchange between the refrigerant and air, wherein at least one of the outdoor heat exchanger or the indoor heat exchanger includes a tube through which the refrigerant flows, heat exchange fins coupled to a surface of the tube, a graphene sheet arranged to be in contact with at least a portion of the heat exchange fins so that heat is conducted to the heat exchange fins, and an electrode electrically connected to the graphene sheet so as to apply current to the graphene sheet.

[0012] According to one embodiment, a refrigerator includes a storage compartment and a heat exchanger for generating cold air to supply cold air to the storage compartment, the heat exchanger including a tube through which a refrigerant flows, heat exchange fins bonded to a surface of the tube, a graphene sheet provided to conduct heat to the heat exchange fins to remove frost generated on the tube and the heat exchange fins, the graphene sheet being provided to be in contact with at least a portion of the heat exchange fins, and an electrode electrically connected to the graphene sheet to supply current to the graphene sheet.

[0013] FIG. 1 is a perspective view schematically illustrating a heat exchanger according to one embodiment of the present disclosure.

[0014] FIG. 2 is a drawing illustrating a state in which a graphene sheet is attached to a heat exchange fin of a heat exchanger according to one embodiment of the present disclosure.

[0015] FIG. 3 is a drawing illustrating a state in which a graphene sheet is attached to a heat exchange fin of a heat exchanger according to one embodiment of the present disclosure.

[0016] FIG. 4 is a drawing illustrating a state in which a graphene sheet is attached to a heat exchange fin of a heat exchanger according to one embodiment of the present disclosure.

[0017] Figure 5 is a drawing illustrating a graphene sheet and electrodes connected to the graphene sheet.

[0018] FIG. 6 is a cross-sectional view showing a cross-section of a heat exchange fin with a graphene sheet attached thereto according to one embodiment of the present disclosure.

[0019] FIG. 7 is a cross-sectional view showing a cross-section of a heat exchange fin with a graphene sheet attached thereto according to one embodiment of the present disclosure.

[0020] FIG. 8 is a cross-sectional view showing a heat exchange fin with a graphene sheet attached thereto according to one embodiment of the present disclosure.

[0021] FIG. 9 is a diagram illustrating a graphene sheet and an electrode connected to the graphene sheet according to one embodiment of the present disclosure.

[0022] FIG. 10 is a cross-sectional view showing a heat exchange fin with a graphene sheet attached thereto according to one embodiment of the present disclosure.

[0023] FIG. 11 is a cross-sectional view showing a heat exchange fin with a graphene sheet attached thereto according to one embodiment of the present disclosure.

[0024] FIG. 12 is a cross-sectional view showing a heat exchange fin with a graphene sheet attached thereto according to one embodiment of the present disclosure.

[0025] FIG. 13 is a schematic diagram schematically illustrating the circulation structure of an indoor unit and an outdoor unit included in an air conditioner according to one embodiment of the present disclosure.

[0026] Figure 14 is a control block diagram of an air conditioner according to one embodiment of the present disclosure.

[0027] FIG. 15 is a cross-sectional view schematically illustrating a refrigerator according to one embodiment of the present disclosure.

[0028] Figure 16 is a control block diagram of an air conditioner according to one embodiment of the present disclosure.

[0029] Fig. 17 is a schematic diagram schematically illustrating the circulation structure of the cold air supply device included in the refrigerator of Fig. 15.

[0030] The embodiments described in this specification and the configurations illustrated in the drawings are merely preferred examples of the disclosed invention, and there may be various modified examples that can replace the embodiments and drawings of this specification at the time of filing of this application.

[0031] Additionally, the same reference numbers or symbols presented in each drawing of this specification represent parts or components that perform substantially the same function.

[0032] In addition, the terminology used in this specification is used to describe embodiments and is not intended to limit and / or restrict the disclosed invention. The singular expression includes plural expression unless the context clearly indicates otherwise. In this specification, the terms "comprise" or "have" and the like are intended to specify the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0033] Additionally, terms including ordinal numbers such as “first,” “second,” etc. used herein may be used to describe various components, but the components are not limited by the terms, and the terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. The term “and / or” includes any combination of a plurality of related listed items or any item among a plurality of related listed items.

[0034] Meanwhile, the terms “upper and lower direction,” “lower side,” and “front and rear direction” used in the following description are defined based on the drawing, and the shape and position of each component are not limited by these terms.

[0035] Hereinafter, embodiments according to the present invention will be described in detail with reference to the attached drawings.

[0036] FIG. 1 is a perspective view schematically illustrating a heat exchanger according to one embodiment of the present disclosure. FIG. 2 is a diagram illustrating a state in which a graphene sheet is attached to a heat exchange fin of a heat exchanger according to one embodiment of the present disclosure. FIG. 3 is a diagram illustrating a state in which a graphene sheet is attached to a heat exchange fin of a heat exchanger according to one embodiment of the present disclosure. FIG. 4 is a diagram illustrating a state in which a graphene sheet is attached to a heat exchange fin of a heat exchanger according to one embodiment of the present disclosure.

[0037] Referring to FIGS. 1 to 4, a heat exchanger (100) may include tubes (110) through which refrigerant flows. The heat exchanger (100) may be configured such that the refrigerant flowing within the tubes (110) and surrounding air exchange heat. In this embodiment, the air may move in the vertical direction of the heat exchanger (100).

[0038] The tube (110) can extend in one direction. The tube (110) can extend in a direction perpendicular to the direction of air movement (D1). That is, the tube (110) can extend perpendicular to the vertical direction, which is the direction of air movement (D1). In the present illustration, the tube (110) can extend in the left-right direction.

[0039] The tube (110) may be arranged in a folded manner so that it can be arranged multiple times along the direction of air movement (D1). That is, the tube (110) may be arranged multiple times in the vertical direction with the portion extending along the left-right direction.

[0040] The heat exchanger (100) may include heat exchange fins (120). The heat exchange fins (120) may be coupled to the surface of the tube (110). The heat exchange fins (120) may be provided in multiple numbers. Specifically, the heat exchange fins (120) may be arranged in multiple numbers along the direction of air movement (D1). That is, the heat exchange fins (120) may be coupled to each of the tubes (110) arranged multiple times along the vertical direction. In other words, the heat exchange fins (120) may be integrally formed for each layer through which the tube (110) passes. However, the present invention is not limited thereto, and the heat exchange fins (120) may be arranged in multiple numbers spaced apart from each other along the extension direction of the tube (110).

[0041] For convenience of explanation, the direction of air movement (D1) is described as being up-down, but is not limited thereto. The heat exchanger (100) may be provided in any shape as long as it is arranged so that heat exchange between the air and the refrigerant within the tube (110) can occur smoothly.

[0042] The heat exchange fin (120) may include a metal material with high thermal conductivity. For example, the heat exchange fin (120) may include aluminum. However, the heat exchange fin (120) is not limited thereto and may include various materials with high thermal conductivity.

[0043] The heat exchange fins (120) may be arranged so as not to impede the movement of air. The heat exchange fins (120) may be repeatedly bent along one direction. That is, the heat exchange fins (120) may be repeatedly bent so as to form a predetermined gap along the extension direction of the tube (110).

[0044] The heat exchange fin (120) may include a vertical surface (123) perpendicular to the extension direction of the tube (110). Tube holes (121, 122) for the tube (110) to pass through may be formed in the vertical surface (123). The vertical surfaces (123) may be positioned at a predetermined interval along the extension direction of the tube (110). That is, air may move between each vertical surface (123).

[0045] The heat exchange fin (120) may include a first folded surface (124) bent from a vertical plane (123). The first folded surface (124) may be bent to form an approximately right angle with the vertical plane (123). The distance between the vertical planes (123) may correspond to the width of the first folded surface (124).

[0046] The heat exchange fin (120) may include a second bending surface (125) that is bent from a vertical plane (123). The second bending surface (125) may be positioned on the opposite side to the first bending surface (124). That is, the first bending surface (124) and the second bending surface (125) may be alternately positioned on opposite sides.

[0047] The first bending surface (124) and the second bending surface (125) may have corresponding widths. The distance between the vertical surfaces (123) may be formed to be constant. Air may exchange heat with the refrigerant within the tube (110) while passing between the vertical surfaces (123).

[0048] The heat exchanger (100) may include a graphene sheet (200) covering at least a portion of the heat exchange fins (120). The graphene sheet (200) may be attached to at least a portion of the heat exchange fins (120). The graphene sheet (200) may cover one side of the heat exchanger (100). However, the present invention is not limited thereto, and the graphene sheet (200) may be arranged to cover both sides of the heat exchanger (100). In addition, the graphene sheet (200) may cover only a portion of the heat exchanger (100).

[0049] The graphene sheet (200) can be repeatedly folded along the heat exchange fin (120). The graphene sheet (200) can be folded together with the heat exchange fin (120) by folding the heat exchange fin (120) while attached to the heat exchange fin (120). Alternatively, the heat exchange fin (120) can be folded first, and then the graphene sheet (200) can be folded and then attached to the heat exchange fin (120).

[0050] The heat exchanger (100) may include an electrode (300) configured to apply current to a graphene sheet (200). The electrode (300) may include a pair of electrodes (310, 320). The pair of electrodes (310, 320) may have different potentials. That is, a potential difference may be formed by the pair of electrodes (310, 320).

[0051] A pair of electrodes (310, 320) may extend along the extension direction of the heat exchange fin (120). Specifically, the pair of electrodes (310, 320) may extend along the vertical plane (123), the first folded surface (124), and the second folded surface (125). At this time, the pair of electrodes (310, 320) may be positioned at a distance from each other. The pair of electrodes (310, 320) may be positioned at a distance from each other along the width direction of the heat exchange fin (120).

[0052] Referring to FIG. 3, a heat exchange fin (120A) according to one embodiment of the present disclosure can be repeatedly folded along the extension direction of the tube (110).

[0053] The heat exchange fin (120A) may include a first inclined surface (121A). The first inclined surface (123A) may be formed to be inclined at a predetermined angle with respect to the tube (110).

[0054] The heat exchange fin (120A) may include a second inclined surface (126A) formed by folding from the first inclined surface (123A). The second inclined surface (126A) may be symmetrical with respect to a direction other than the direction of air movement (D1, see FIG. 1) among the directions perpendicular to the extension direction of the tube (110) and the first inclined surface (123A).

[0055] The heat exchange fin (120A) may include a first folding portion (124A) that folds from a first inclined surface (123A). The first folding portion (124A) may be an edge formed between the first inclined surface (123A) and the second inclined surface (126A).

[0056] The heat exchange fin (120A) may include a second folding portion (125A) that folds from the second inclined surface (124A). The second folding portion (125A) may be an edge formed between the second inclined surface (126A) and the first inclined surface (123A).

[0057] The heat exchange fin (120A) may include a first through hole (121A) formed in a first inclined surface (123A) for the tube (110) to pass through. The heat exchange fin (120A) may include a second through hole (121A) formed in a second inclined surface (126A) for the tube (110) to pass through. The first through hole (121A) and the second through hole (121A) may be provided one at a time.

[0058] Referring to FIG. 4, the heat exchange fin (120B) according to one embodiment of the present disclosure can be repeatedly folded along the extension direction of the tube (110).

[0059] The heat exchange fin (120B) may include a first inclined surface (121B). The first inclined surface (123B) may be formed to be inclined at a predetermined angle with respect to the tube (110).

[0060] The heat exchange fin (120B) may include a second inclined surface (126B) formed by folding from the first inclined surface (123B). The second inclined surface (126B) may be symmetrical with respect to a direction other than the direction of air movement (D1, see FIG. 1) among the directions perpendicular to the extension direction of the tube (110) and the first inclined surface (123B).

[0061] The heat exchange fin (120B) may include a first folding portion (124B) that folds from a first inclined surface (123B). The first folding portion (124B) may be an edge formed between the first inclined surface (123B) and the second inclined surface (126B).

[0062] The heat exchange fin (120B) may include a second folding portion (125B) that folds from the second inclined surface (124B). The second folding portion (125B) may be an edge formed between the second inclined surface (126B) and the first inclined surface (123B).

[0063] The heat exchange fin (120B) may include a first through hole (121B) formed in a first inclined surface (123B) for the tube (110) to pass through. The heat exchange fin (120B) may include a second through hole (121B) formed in a second inclined surface (126B) for the tube (110) to pass through. The first through hole (121B) and the second through hole (121B) may be provided as a pair.

[0064] However, without being limited thereto, the number of the first through-hole and the second through-hole may vary depending on the number of tubes penetrating one heat exchange fin. That is, if the number of tubes penetrating one heat exchange fin is three, the number of the first through-hole and the number of the second through-hole may also be three each.

[0065] Figure 5 is a drawing illustrating a graphene sheet and electrodes connected to the graphene sheet.

[0066] Referring to FIG. 5, the structure of the graphene sheet (200) and the electrode (300) is described in detail.

[0067] The graphene sheet (200) may be elongated along one direction. The graphene sheet (200) may have a length corresponding to the heat exchange fin (120, see FIG. 2) so as to be attached along the heat exchange fin.

[0068] The electrode (300) may extend along the extension direction of the graphene sheet (200). The electrode (300) may be positioned on both sides of the graphene sheet (200). The electrodes (300) may be positioned spaced apart by a length corresponding to the width of the graphene sheet (200).

[0069] The plurality of electrodes (300) may be electrically connected to a power supply unit (40), respectively. The plurality of electrodes (300) may be configured as a pair. For example, the plurality of electrodes (300) may be electrically connected to a power supply unit (40) via wires, respectively. The plurality of electrodes (300) may be connected to a power supply unit (40), and the power supply unit (40) may generate a potential difference between the plurality of electrodes (300), or may remove the potential difference. The graphene sheet (200) may receive power from the power supply unit (40) through the plurality of electrodes (300).

[0070] When a voltage is applied between a plurality of electrodes (300), an electric field may be generated in a region of the graphene sheet (200) located between the plurality of electrodes (300). As a result, a current may flow in the region of the graphene sheet (200) located between the plurality of electrodes (300), and heat may be generated in the region due to resistance. Accordingly, the graphene sheet (200) may be configured to generate heat based on the voltage applied.

[0071] FIG. 5A is an enlarged view of each layer by cutting out a portion of a pair of electrodes (310, 320) where the first electrode (310) and the graphene sheet (200) are in contact. FIG. 5B is an enlarged view of each layer by cutting out a portion of a pair of electrodes (310, 320) where the second electrode (320) and the graphene sheet (200) are in contact. FIG. 5C is an enlarged view of each layer by cutting out a portion of a graphene sheet (200) located between the pair of electrodes (310, 320).

[0072] The structures of A and B in Fig. 5 can correspond to each other.

[0073] Referring to A, B, and C of FIG. 5, the graphene sheet (200) may include a graphene layer (200a) in which graphene is arranged in at least one layer, and a base layer (200b) that supports the graphene layer (200a). That is, the graphene sheet (200) may include a graphene layer (200a) and a base layer (200b).

[0074] The graphene layer (200a) may be configured to generate heat by resistance when voltage is applied and current flows. At this time, the thickness of one layer of graphene is approximately 0.2 nanometers, and for example, the thickness of the graphene layer (200a) provided on the graphene sheet (200s) may be 10 micrometers or less. As such, since the graphene layer (200a) itself is very thin, the graphene sheet (200) may require a base layer (200b) to support the graphene layer (200a). For example, the base layer (200b) may have a thickness of approximately 50 micrometers. The base layer (200b) may be formed in the shape of a thin film to which the graphene layer (200b) is attached and which supports the graphene layer (200b).

[0075] The graphene layer (200a) may be bonded to one surface of the base layer (200b). For example, the graphene layer (200a) and the base layer (200b) may be bonded to each other by intermolecular forces (such as van der Waals forces).

[0076] Since the graphene layer (200a) is a part that generates heat when voltage is applied, the base layer (200b) may be composed of a material with high heat resistance. For example, the base layer (200b) may be composed of a material including polyamide. However, the present invention is not limited thereto, and the base layer (200b) may be composed of various materials, such as a resin material including polyethylene terephthalate (PET).

[0077] Due to the highly flexible nature of graphene, the graphene layer (200a) can be configured to have high flexibility. In addition, the base layer (200b) can be configured to have high flexibility. For example, the base layer (200b) can be formed as a film composed of a material including the aforementioned polyamide, polyethylene terephthalate, etc. As a result, it can be easy to bend the graphene layer (200a) and the base layer (200b).

[0078] Referring to A and B of FIG. 5, a plurality of electrodes (300) may each be bonded to a graphene sheet (200). Specifically, the plurality of electrodes (300) may each be attached to a graphene layer (200a). The plurality of electrodes (300) may each be attached to a side of the graphene layer (200a) opposite to the side bonded to the base layer (200b). Accordingly, each of the plurality of electrodes (300) may be electrically connected to the graphene layer (200a), and when a voltage is applied between the plurality of electrodes (300), current may flow in the graphene layer (200a).

[0079] Referring to A and B of FIG. 5, each of the plurality of electrodes (300) can be bonded to a graphene sheet (200s) by an adhesive layer (ad). The graphene sheet (200s) can be attached to a graphene layer (200a) by the adhesive layer (ad). The adhesive layer (ad) can be provided between the graphene layer (200a) and the electrode (300). The adhesive layer (ad) is provided to have high electrical conductivity, so that each of the plurality of electrodes (300) can be electrically connected to the graphene layer (200a).

[0080] For example, the adhesive layer (ad) may include various types of conductive adhesives, such as silver paste.

[0081] For example, the adhesive layer (ad) may have a thickness of approximately 10 micrometers or less.

[0082] However, this is not limited thereto, and each of the plurality of electrodes (300) may be bonded to the graphene layer (200a) in various ways.

[0083] For example, referring to A and B of FIG. 5, each of the plurality of electrodes (300) may include a contact electrode (300a). The contact electrode (300a) may be in contact with the graphene sheet (200s) and may be electrically connected to the graphene sheet (200). Specifically, the contact electrode (300a) may be attached to one side of the graphene layer (200a) opposite to the side that is bonded to the base layer (200b). The contact electrode (300a) may be electrically connected to the power supply unit (40). The graphene layer (200a) may receive voltage through the plurality of contact electrodes (300a).

[0084] The contact electrode (300a) may include a conductive material. For example, the contact electrode (300a) may include various types of conductive metal materials, such as copper.

[0085] For example, the contact electrode (300a) may have a thickness of approximately 60 micrometers.

[0086] For example, the aforementioned adhesive layer (ad) may be provided between the contact electrode (300a) and the graphene layer (200a). The contact electrode (300a) may be attached to the graphene layer (200a) by the adhesive layer (ad). The contact electrode (300a) may be electrically connected to the graphene layer (200a) by the adhesive layer (ad).

[0087] For example, referring to A and B of FIG. 5, each of the plurality of electrodes (300) may include a pad electrode (300b). The pad electrode (300b) may be electrically connected to a contact electrode (300a). The pad electrode (300b) may be bonded to the contact electrode (300a). The pad electrode (300b) may be attached to the other surface of the contact electrode (300a) opposite to the surface facing the graphene layer (200a). The pad electrode (300b) may be electrically connected to a power supply unit (40).

[0088] The pad electrode (300b) may include a conductive material. For example, the pad electrode (300b) may be formed by soldering various types of conductive metals, such as solder.

[0089] For example, the contact electrode (300a) and the pad electrode (300b) may be joined to each other by a conductive adhesive such as silver paste. However, the present invention is not limited thereto, and the contact electrode (300a) and the pad electrode (300b) may be joined to each other by various methods.

[0090] For example, the wires connecting each of the plurality of electrodes (300) to the power supply unit (40) may be connected to the pad electrode (300b) and / or the contact electrode (300a). As a result, the plurality of electrodes (300) may be electrically connected to the power supply unit (40), and the graphene layer (200a) may receive voltage through the plurality of electrodes (300).

[0091] Referring to A, B, and C of FIG. 5, the graphene sheet (200s) may further include an encapsulation layer (en). That is, the graphene sheet (200) may include an encapsulation layer (en). The encapsulation layer (en) may be provided to protect the graphene layer (200a) from the outside. The encapsulation layer (en) may be arranged on one side of the graphene layer (200a) opposite to the base layer (200b). The encapsulation layer (en) may be formed through an encapsulation process that wraps one side of the graphene layer (200a) opposite to the base layer (200b). The encapsulation layer (en) may form one outer surface of the graphene sheet (200).

[0092] Referring to A and B of FIG. 5, the encapsulation layer (en) can cover each of the plurality of electrodes (300). Specifically, the encapsulation layer (en) can cover the pad electrode (300b) of each of the plurality of electrodes (300).

[0093] Referring to FIG. C of FIG. 5, the encapsulation layer (en) can cover the graphene layer (200a).

[0094] In other words, the encapsulation layer (en) entirely covers one side of the graphene layer (200a) and forms one side of the graphene sheet (200), and a plurality of electrodes (300) can be placed between a part of the encapsulation layer (en) and a part of the graphene layer (200a).

[0095] The encapsulation layer (en) may be composed of a highly flexible material. The encapsulation layer (en) may be composed of a highly moisture-resistant or heat-resistant material. For example, the encapsulation layer (en) may include various materials, such as epoxy or a resin material such as polyethylene terephthalate (PET).

[0096] For example, the encapsulation layer(en) can be formed into a flexible, thin film.

[0097] For example, the encapsulation layer(en) may have a thickness of approximately 50 micrometers.

[0098] The structure of each layer constituting the graphene sheet (200) and the plurality of electrodes (300) is not limited to what has been described above. In addition, the thickness, material, etc. of each layer constituting the graphene sheet (200), the plurality of electrodes (300), etc. are not limited to what has been described above.

[0099] FIG. 6 is a cross-sectional view illustrating a cross-section of a heat exchange fin with a graphene sheet attached thereto according to an embodiment of the present disclosure. FIG. 7 is a cross-sectional view illustrating a cross-section of a heat exchange fin with a graphene sheet attached thereto according to an embodiment of the present disclosure. FIG. 8 is a cross-sectional view illustrating a cross-section of a heat exchange fin with a graphene sheet attached thereto according to an embodiment of the present disclosure.

[0100] Referring to FIGS. 6 to 8, a graphene sheet (200) is attached to a heat exchange fin (120) according to one embodiment of the present disclosure, and current can be supplied to the graphene sheet (200). Heat can be generated in the graphene layer (200a) by the current supplied to the graphene sheet (200). A cross-section of the heat exchange fin (120) to which the graphene sheet (200) is attached is enlarged to explain the movement of heat generated in the graphene sheet (200).

[0101] Referring to FIG. 6, a heat exchanger (100) according to one embodiment of the present disclosure may include a graphene sheet (200) provided to cover a heat exchange fin (120). The graphene sheet (200) may receive current from a power supply unit (40). The graphene layer (200a) of the graphene sheet (200) may generate heat by the supplied current. The generated heat may be released through the heat exchange fin (120) and the encapsulation layer (en).

[0102] A base layer (200b) may be placed between the graphene layer (200a) and the heat exchange fins (120). However, the base layer (200b) is sufficiently thin so that heat generated in the graphene layer (200a) can be conducted to the heat exchange fins (120). Similarly, the thickness of the adhesive layer (ad) is sufficiently thin so that heat generated in the graphene layer (200a) can be conducted to the encapsulation layer (en) through a pair of electrodes (310, 320).

[0103] In addition, the pair of electrodes (310, 320) is also sufficiently thin so that the generated heat can be conducted to the encapsulation layer (en). The gap between the graphene layer (200a) and the encapsulation layer (en) can be filled with air. However, since the distance between the pair of electrodes (310, 320) is sufficiently large compared to the thickness of the pair of electrodes (310, 320), the encapsulation layer (en) can be in contact with the graphene layer (200a). That is, the heat generated in the graphene layer (200a) can be directly conducted to the encapsulation layer (en).

[0104] The air around the heat exchange fins (120) can be heated by the heat generated in the graphene sheets (200) even if it does not exchange heat with the refrigerant flowing within the heat exchange fins (120). That is, if the heat exchanger (100) is a condenser that heats the surrounding air, the surrounding air can be efficiently heated. If the heat exchanger (100) is a condenser, energy efficiency can be increased.

[0105] Hereinafter, a description will be given of an embodiment other than the heat exchanger (100) of Fig. 6. The same components are assigned the same reference numerals and detailed descriptions are omitted, while other components are described in detail.

[0106] Referring to FIG. 7, a heat exchanger (100A) according to one embodiment of the present disclosure may include a graphene coating (210) arranged to be in contact with a graphene sheet (200).

[0107] The graphene coating (210) can be in contact with the graphene sheet (200) so that heat generated in the graphene sheet (200) is conducted. Specifically, heat generated in the graphene sheet (200) can be conducted to the graphene coating (210) by current supplied from a pair of electrodes (310, 320).

[0108] A graphene coating (210) may be provided to cover the graphene sheet (200). The graphene coating (210) may be provided on the outermost surface. The graphene coating (210) may be provided by spraying a material containing graphene. Alternatively, the graphene coating (210) may be provided by immersing in a solution containing graphene. In addition, the graphene coating (210) may be provided in various ways.

[0109] The graphene coating (210) may have excellent thermal conductivity because it contains graphene. When heat generated from the graphene sheet (200) is conducted to the graphene coating (210), it can be quickly conducted to the area where the graphene coating (210) is applied.

[0110] Heat generated in the graphene layer (200a) can be conducted to the graphene coating (210) through a pair of electrodes (310, 320) and an encapsulation layer (en). In addition, heat generated in the graphene layer (200a) can be conducted to the heat exchange fins (120) through the base layer (200b).

[0111] Referring to FIG. 8, a heat exchanger (100B) according to one embodiment of the present disclosure can have a graphene coating (210) that protects a graphene sheet (200). That is, the graphene coating (210) can replace an encapsulation layer (en). The graphene coating (210) can form the outer surface of the heat exchange fin (120).

[0112] The graphene coating (210) can be applied to the outermost surface of the heat exchange fin (120). The graphene coating (210) can cover the entire graphene sheet (200). That is, when heat generated from the graphene sheet (200) is conducted to the graphene coating (210), it can be quickly conducted to the area where the graphene coating (210) is applied.

[0113] Heat generated in the graphene layer (200a) can be conducted to the graphene coating (210) through a pair of electrodes (310, 320). In addition, heat generated in the graphene layer (200a) can be conducted to the heat exchange fins (120) through the base layer (200b).

[0114] FIG. 9 is a diagram illustrating a graphene sheet and an electrode connected to the graphene sheet according to one embodiment of the present disclosure.

[0115] Referring to FIG. 9, a graphene sheet (200A) according to one embodiment of the present disclosure may be connected to one electrode (300). The electrode (320) may extend along one side of the graphene sheet (200A).

[0116] The electrode (320) can be electrically connected to the power supply unit (40). The electrode (320) can be provided in one piece. The electrode (320) can be electrically connected to the power supply unit (40) by a wire. The heat exchange fin (120) can be connected to the power supply unit (40). The heat exchange fin (120) can include a conductive metal material. That is, the heat exchange fin (120) can function as an electrode. The power supply unit (40) can generate a potential difference between the electrode (320) and the heat exchange fin (120), or can remove the potential difference. The graphene sheet (200) can receive power from the power supply unit (40) through the electrode (320) and the heat exchange fin (120).

[0117] For example, when voltage is applied to the electrode (320) and the heat exchange fin (120), an electric field may be generated in a region of the graphene sheet (200) located between the electrode (320) and the heat exchange fin (120). As a result, current may flow in a region of the graphene sheet (200) located between a plurality of electrodes (300), and heat may be generated in the region due to resistance. Accordingly, the graphene sheet (200) may be arranged to generate heat based on the voltage applied.

[0118] FIG. 10 is a cross-sectional view illustrating a heat exchange fin with a graphene sheet attached thereto according to an embodiment of the present disclosure. FIG. 11 is a cross-sectional view illustrating a heat exchange fin with a graphene sheet attached thereto according to an embodiment of the present disclosure. FIG. 12 is a cross-sectional view illustrating a heat exchange fin with a graphene sheet attached thereto according to an embodiment of the present disclosure.

[0119] Referring to FIGS. 10 to 12, the path of heat movement generated in the graphene layer (200a) will be described. The arrows depicted in the drawings schematically illustrate the path of heat movement.

[0120] Referring to FIG. 10, a heat exchanger (100C) according to one embodiment of the present disclosure may include a graphene sheet (200) covering a portion of a heat exchange fin (120).

[0121] The graphene sheet (200) may cover only a portion of the heat exchange fin (120). That is, the remaining portion of the heat exchange fin (120) may not be covered by the graphene sheet (200).

[0122] The heat exchanger (100C) may include a graphene coating (210) covering the remaining portion of the heat exchange fins (120) that is not covered by the graphene sheet (200).

[0123] The graphene coating (210) may cover the remaining portion of the heat exchange fins (120). In addition, the graphene coating (210) may cover a portion of the graphene sheet (200). The graphene coating (210) may form the outer surface of the heat exchange fins (120) together with the encapsulation layer (en). The graphene coating (210) may protect the heat exchange fins (120) and the graphene sheet (200) from the outside together with the encapsulation layer (en).

[0124] The graphene coating (210) may be arranged to conduct heat generated from the graphene layer (200a). The graphene coating (210) may be in direct contact with the graphene layer (200a).

[0125] The graphene coating (210) can be in contact with the heat exchange fin (120). Heat generated in the graphene layer (200a) can be conducted to the heat exchange fin (120) through the graphene coating (210).

[0126] Heat generated in the graphene layer (200a) can also be conducted through the electrode (320) and the encapsulation layer (en). In addition, heat generated in the graphene layer (200a) can be conducted to the heat exchange fins (120) through the base layer (200b).

[0127] Referring to FIG. 11, a heat exchanger (100D) according to one embodiment of the present disclosure may include a graphene coating (210) provided to cover both the heat exchange fins (120) and the graphene sheet (200).

[0128] The heat exchanger (100C) may include a graphene coating (210) covering the remaining portion of the heat exchange fins (120) that is not covered by the graphene sheet (200).

[0129] The graphene coating (210) may cover the remaining portion of the heat exchange fins (120). In addition, the graphene coating (210) may cover a portion of the graphene sheet (200). The graphene coating (210) may cover the encapsulation layer (en) located at the outermost portion of the graphene sheet (200).

[0130] The graphene coating (210) can be in contact with the heat exchange fin (120). Heat generated in the graphene layer (200a) can be conducted to the heat exchange fin (120) through the graphene coating (210).

[0131] Heat generated in the graphene layer (200a) can be conducted to the graphene coating (210) through the electrode (320) and the encapsulation layer (en). In addition, heat generated in the graphene layer (200a) can be conducted to the heat exchange fin (120) through the base layer (200b).

[0132] Referring to FIG. 12, a heat exchanger (100E) according to one embodiment can have a graphene coating (210) that protects a graphene sheet (200). That is, the graphene coating (210) can replace an encapsulation layer (en). The graphene coating (210) can form the outer surface of the heat exchange fin (120).

[0133] The graphene coating (210) can be applied to the outermost surface of the heat exchange fin (120). The graphene coating (210) can cover the entire graphene sheet (200). That is, when heat generated from the graphene sheet (200) is conducted to the graphene coating (210), it can be quickly conducted to the area where the graphene coating (210) is applied.

[0134] Heat generated in the graphene layer (200a) can be conducted to the graphene coating (210) through the electrode (320). In addition, heat generated in the graphene layer (200a) can be conducted to the heat exchange fin (120) through the base layer (200b).

[0135] Hereinafter, a description will be given of a home appliance to which a heat exchanger (100) according to one embodiment of the present disclosure can be applied. The heat exchanger (100) can be used in all home appliances including heat pumps. For example, the heat exchanger (100) can be applied to air conditioners, refrigerators, and the like.

[0136] FIG. 13 is a schematic diagram schematically illustrating the circulation structure of an indoor unit and an outdoor unit included in an air conditioner according to one embodiment of the present disclosure.

[0137] Referring to FIG. 13, a heat exchanger (100) according to the present disclosure can be used in an air conditioner (1) having a refrigerant circuit to which a compressor (11), an outdoor heat exchanger (12), an expansion valve (13), and an indoor heat exchanger (21) are connected.

[0138] The dotted arrows shown represent the flow of refrigerant during heating operation of the air conditioner (1), and the solid arrows represent the warm air discharged from the indoor unit (10).

[0139] The air conditioner (1) includes an outdoor unit (10) and an indoor unit (20), and can cool or heat the interior.

[0140] The outdoor unit (10) may include a compressor (11), an outdoor heat exchanger (12), an expansion valve (13), and an outdoor fan (14), and the indoor unit (20) may include an indoor heat exchanger (21) and an indoor fan (22). A refrigerant pipe through which refrigerant circulates may be connected between the outdoor unit (10) and the indoor unit (20).

[0141] The compressor (11) compresses the refrigerant and discharges the compressed high-temperature gaseous refrigerant to the indoor heat exchanger (12). The indoor heat exchanger (12) releases heat from the refrigerant to condense the refrigerant. At this time, the high-temperature, high-pressure gaseous refrigerant can change into a high-temperature, high-pressure liquid refrigerant.

[0142] The expansion valve (13) lowers the pressure and temperature of the refrigerant flowing from the indoor heat exchanger (12) so that heat absorption by evaporation of the refrigerant can easily occur, and then transfers the refrigerant to the outdoor heat exchanger (21). That is, the high-temperature, high-pressure liquid refrigerant passing through the expansion valve (13) changes into a low-temperature, low-pressure liquid state.

[0143] The outdoor heat exchanger (21) evaporates the refrigerant flowing in from the expansion valve (13) to exchange heat with the outdoor air. At this time, the low-temperature, low-pressure liquid refrigerant changes into a low-temperature, low-pressure gaseous state.

[0144] A heat exchanger (100) according to one embodiment of the present disclosure can be applied to both an indoor heat exchanger (12) and an outdoor heat exchanger (21).

[0145] An air conditioner (1) according to one embodiment of the present disclosure can perform heating operation to heat a room. The indoor heat exchanger (12) of the indoor unit (10) can be used as a condenser. The indoor heat exchanger (12) can release heat of the introduced refrigerant to heat the indoor air and then discharge it into the room.

[0146] A heat exchanger (100) according to one embodiment of the present disclosure may be applied to an indoor heat exchanger (12). The heat exchanger (100) can generate heat by supplying current to a graphene sheet (200, see FIG. 2). That is, the surrounding air can be heated by the heat generated from the graphene sheet (200) without operating the compressor (11), thereby improving heat exchange efficiency.

[0147] In addition, the compressor (11) can be operated to exchange heat between the refrigerant in the indoor heat exchanger (12) and the surrounding air. At the same time, current can be supplied to the graphene sheet (200) to generate heat, which can then heat the surrounding air. In other words, heating using a heat pump and heating using the graphene sheet (200) can be performed simultaneously.

[0148] In this way, the indoor unit (10) equipped with a heat exchanger (100) according to one embodiment of the present disclosure can perform heating operation without the operation of the compressor (11). That is, energy efficiency can be improved by eliminating the need for refrigerant circulation in the heat pump. Furthermore, energy efficiency can be increased due to the electrical and thermal conductivity properties of graphene.

[0149] When an air conditioner (1) according to one embodiment of the present disclosure performs a heating operation to heat a room, frost may be generated in the outdoor unit (20). Frost may be generated depending on the ambient temperature and humidity of the outdoor heat exchanger (21). When the indoor unit (10) is in heating operation, the outdoor heat exchanger (21) of the outdoor unit (20) discharges cold air, so frost is likely to be generated.

[0150] Frost generated in the outdoor unit (20) may hinder the smooth operation of the air conditioner (1). Therefore, the outdoor unit (20) can perform a defrosting operation to remove the frost generated in the outdoor unit (20).

[0151] The outdoor heat exchanger (21) of the outdoor unit (20) can remove frost through defrosting operation. Frost can be generated in the tube (110, see Fig. 1) and heat exchange fin (120, see Fig. 1) of the outdoor unit (20).

[0152] A heat exchanger (100) according to one embodiment of the present disclosure may include a graphene sheet (200) that is arranged to cover at least a portion of a heat exchange fin (120). By supplying current through an electrode (300) electrically connected to the graphene sheet (200), heat may be generated in the graphene sheet (200). The generated heat may be conducted through surrounding components such as the heat exchange fin (120) or the graphene coating (210, see FIG. 7).

[0153] Heat generated from the graphene sheet (200) can be conducted to the entire heat exchange fin (120). In addition, heat generated from the graphene sheet (200) can be quickly spread to the entire heat exchange fin (120) due to the excellent thermal conductivity of graphene. Since the heat exchange fin (120) is bonded to the surface of the tube (110), heat conducted to the heat exchange fin (120) can also be conducted to the tube (110). That is, frost generated in the tube (110) and the heat exchange fin (120) can be quickly and easily removed.

[0154] An outdoor unit (20) according to one embodiment of the present disclosure may include a defrost heater (not shown). The defrost heater (not shown) may generate heat around the outdoor heat exchanger (21) to remove the generated frost. Since the defrost heater (not shown) does not physically contact the heat exchange fins (120) or tubes (110), it may transfer heat through radiation. Heat transfer through radiation may be less efficient than heat conduction.

[0155] A heater (not shown) can generate heat by supplying current to a metal with high electrical resistance, and then supply the heat to a heat exchanger (100). In general, the process of generating heat by supplying current to a metal can consume a lot of energy.

[0156] Accordingly, the air conditioner (1) according to one embodiment of the present disclosure can perform defrosting using the graphene sheet (200) without operating the defrosting heater (not shown) during defrosting operation. Of course, during defrosting operation, defrosting can also be performed by operating the defrosting heater (not shown) and the graphene sheet (200) simultaneously.

[0157] An air conditioner (1) according to one embodiment of the present disclosure can facilitate control of defrosting operation. Since the graphene sheet (200) has excellent electrical conductivity, it can rapidly heat the area around the heat exchange fins (120) and tubes (110). In other words, the defrosting efficiency can be improved.

[0158] Additionally, the graphene sheet (200) is light in weight and small in volume, which can further increase the size of the heat exchanger (100). As the size of the heat exchanger (100) increases, more tubes (110) through which the refrigerant flows and more heat exchange fins (120) can be arranged. Accordingly, heat exchange efficiency can be increased.

[0159] Figure 14 is a control block diagram of an air conditioner according to one embodiment of the present disclosure.

[0160] An air conditioner (1) according to one embodiment of the present disclosure may include a control unit (30) that controls various components of the air conditioner (1).

[0161] The control unit (30) may include a processor (31) that generates a control signal regarding the operation of the hot air device (1), and a memory (32) that stores programs, applications, instructions, and / or data for the operation of the hot air device (1). The processor (31) and the memory (32) may be implemented as separate semiconductor devices or as a single semiconductor device.

[0162] Additionally, the control unit (30) may include a plurality of processors or a plurality of memories. The control unit (30) may be provided at various locations inside the air conditioner (1).

[0163] The processor (31) may include an arithmetic circuit, a memory circuit, and a control circuit. The processor (31) may include one chip or multiple chips. In addition, the processor (31) may include one core or multiple cores.

[0164] Memory (32) stores various programs and data required for control, and can temporarily store temporary data generated during control.

[0165] The memory (32) may include volatile memory such as Static Random Access Memory (S-RAM) and Dynamic Random Access Memory (D-RAM), and non-volatile memory such as Read Only Memory (ROM) and Erasable Programmable Read Only Memory (EPROM). The memory (32) may include one memory element or may include a plurality of memory elements.

[0166] The processor (31) may be electrically connected to the memory (32). The processor (31) may process data and / or signals using a program provided from the memory (32), and may transmit a control signal to each component of the air conditioner (1) based on the processing result. Each component of the air conditioner (1) may be operated based on the control signal of the processor (31).

[0167] The air conditioner (1) may include a user interface (50). For example, the user interface (50) may receive touch input. Alternatively, the user interface (50) may output an image.

[0168] The user interface (50) may include an input interface (51) for receiving user input. The user interface (50) may include a plurality of buttons provided on the air conditioner (1). For example, the input interface (51) may include an operation mode button for selecting a cooling mode, a heating mode, or a defrosting mode, a wind direction button for setting the direction of the wind, and / or a wind volume button for setting the wind strength (rotation speed of the blower fan).

[0169] The plurality of buttons may include a push switch, a membrane switch, and / or a touch switch that is operated by a user's pressing, and / or a touch switch that is operated by a contact with a part of the user's body. In addition, the input interface (51) may include a remote control provided separately from the air conditioner (1), and a receiver that receives a wireless signal from the remote control.

[0170] The output interface (52) can display information regarding the status and operation of the air conditioner (1). The output interface (52) can display information related to the operation of the air conditioner (1) in the form of at least one of an image or text. The output interface (52) can be provided on the air conditioner (1). Alternatively, the output interface (52) can be provided on a remote controller and a receiver that receives a wireless signal from the remote controller.

[0171] The output interface (52) may be implemented as a liquid crystal display (LCD), a light emitting diode (LED), an organic light emitting diode (OLED), and / or a micro LED. Furthermore, the output interface (52) may be implemented as a touch display. The touch display may include a display panel that displays an image and a touch panel that receives a touch input.

[0172] The control unit (30) can control the operation of the compressor (11). The control unit (30) can operate the compressor (11) to turn the refrigerant into a high-temperature, high-pressure gas. The refrigerant compressed by the compressor (11) can circulate through the heat pump. The refrigerant compressed by the compressor (11) can circulate through the indoor heat exchanger (12), the expansion valve (13), and the outdoor heat exchanger (21).

[0173] The control unit (30) can control the compressor (11) not to operate. The control unit (30) can cause the indoor unit (10) to discharge heated air into the room without operating the compressor (11), i.e., without operating the heat pump.

[0174] The control unit (30) can operate the outdoor fan (14). The outdoor fan (14) can supply air to the outdoor heat exchanger (21). That is, the outdoor fan (14) can supply ambient air so that heat exchange occurs in the outdoor heat exchanger (21).

[0175] The control unit (30) can operate the indoor fan (22). The indoor fan (22) can generate an air current to discharge the air heated or cooled in the indoor heat exchanger (12) into the room.

[0176] The control unit (30) can control the power supply unit (40). The control unit (30) can be electrically connected to the power supply unit (40). The control unit (30) can control the power supply unit (40) based on a user's input. Alternatively, the control unit (30) can control the operation mode of the indoor unit (10) based on a user's input. Alternatively, the control unit (30) can control the operation mode of the outdoor unit (20) based on a user's input.

[0177] The control unit (30) can control the indoor unit (10) to operate for heating. The control unit (30) can control the indoor heat exchanger (12) of the indoor unit (10) to heat the surrounding air. The control unit (30) can operate the compressor (11) to circulate the refrigerant in the heat pump. The control unit (30) can control the refrigerant in the indoor heat exchanger (12), i.e., the condenser, to exchange heat with the surrounding air to heat the surrounding air. The control unit (30) can control the indoor fan (14) to operate to discharge the air heated in the indoor heat exchanger (12) into the room.

[0178] The control unit (30) can control the power supply unit (40) to supply current to the graphene sheet (20) of the indoor heat exchanger (12). The power supply unit (40) can supply current to the graphene sheet (20) through the electrode (300) so that heat is generated in the graphene layer (200a).

[0179] The control unit (30) can control the power supply unit (40) to supply current to the graphene sheet (200) or to operate the compressor (11) to circulate the refrigerant. The control unit (30) can control the power supply unit (40) to supply current to the graphene sheet (200) while operating the compressor (11).

[0180] The control unit (30) can control the outdoor unit (20) to perform a defrosting operation. The control unit (20) can operate a defrosting heater (not shown) to perform a defrosting operation. During the defrosting operation, the control unit (20) can control the power supply unit (40) to supply current to the graphene sheet (200) through the electrode (300).

[0181] The graphene sheet (200) can generate heat by the supplied current. The generated heat can be conducted to the heat exchange fins (120) and / or the graphene coating (210) and spread throughout the outdoor heat exchanger (21).

[0182] In this way, the control unit (30) can control the power supply unit (40) to generate heat in the graphene sheet (200). That is, the indoor unit (10) can warm the room by discharging warm air using the heat generated in the graphene sheet (200). The outdoor unit (20) can defrost using the heat generated in the graphene sheet (200).

[0183] FIG. 15 is a cross-sectional view schematically illustrating a refrigerator according to one embodiment of the present disclosure.

[0184] A refrigerator (2) according to one embodiment of the present disclosure may include an inner case (91) forming a storage compartment (90) and an outer case (92) forming an outer appearance. An insulating material (93) may be foamed between the inner case (91) and the outer case (92). The refrigerator (2) may include a door (95) configured to open and close the open front surface of the storage compartment (90).

[0185] A machine room (80) in which a compressor (61) for compressing refrigerant and a condenser (not shown) are installed may be provided at the lower rear side of the refrigerator (2). The refrigerator (2) may include a cold air supply device (60) for supplying cold air to a storage room (90).

[0186] The cold air supply device (60) may include a refrigeration cycle including an evaporator (100), a compressor (61), a condenser (62, see FIG. 16), and an expansion valve (64, see FIG. 16), a fan (63) for supplying cold air generated in the evaporator (100) to a storage chamber (90), and a duct (70, 80) forming an air movement passage. The heat exchanger (100) included in the cold air supply device (50) described below may refer to the evaporator (100). That is, the evaporator (100) may be a heat exchanger (100) according to one embodiment of the present disclosure.

[0187] The cold air supply device (60) may include a heat exchanger (100) that generates cold air, a duct (70, 80) that forms an air flow passage inside the cold air supply device (60), and a fan (63) that forms an air flow inside the duct (70, 80).

[0188] The duct (70, 80) may include an intake duct (70) that forms an air inlet passage (61) through which air from the storage room (90) is introduced and passes through the heat exchanger (100), and an exhaust duct (80) that forms an air discharge passage (81) for supplying cold air that has passed through the heat exchanger (100) to the storage room (90). The intake duct (70) may be arranged upstream of the fan (63), and the exhaust duct (80) may be arranged downstream of the fan (63). The exhaust duct (80) may be provided with a plurality of outlets (67) so that cold air can be distributed to the storage room (90).

[0189] Fig. 16 is a control block diagram of an air conditioner according to one embodiment of the present disclosure. Fig. 17 is a schematic diagram schematically illustrating the circulation structure of a cold air supply device included in the refrigerator of Fig. 15.

[0190] Referring to FIGS. 16 and 17, the refrigerator (2) may include a control unit (300) that controls various components of the refrigerator (2).

[0191] The control unit (300) may include a processor (310) that generates a control signal regarding the operation of the refrigerator (2), and a memory (320) that stores programs, applications, instructions, and / or data for the operation of the refrigerator (2). The processor (310) and the memory (320) may be implemented as separate semiconductor devices or as a single semiconductor device.

[0192] Additionally, the control unit (300) may include a plurality of processors or a plurality of memories. The control unit (300) may be provided at various locations inside the refrigerator (2).

[0193] The processor (310) may include an arithmetic circuit, a memory circuit, and a control circuit. The processor (310) may include one chip or multiple chips. In addition, the processor (310) may include one core or multiple cores.

[0194] The memory (320) stores various programs and data required for control, and can temporarily store temporary data generated during control.

[0195] The memory (320) may include volatile memory such as Static Random Access Memory (S-RAM) and Dynamic Random Access Memory (D-RAM), and non-volatile memory such as Read Only Memory (ROM) and Erasable Programmable Read Only Memory (EPROM). The memory (320) may include one memory element or may include a plurality of memory elements.

[0196] The processor (310) may be electrically connected to the memory (320). The processor (310) may process data and / or signals using a program provided from the memory (320), and may transmit control signals to each component of the refrigerator (2) based on the processing results. Each component of the refrigerator (2) may be operated based on the control signals of the processor (310).

[0197] The electronic components constituting the control unit (300) can be installed at various locations in the refrigerator (2).

[0198] The refrigerator (2) may include a user interface (500). For example, the user interface (500) may receive a touch input. Alternatively, the user interface (500) may output an image.

[0199] The user interface (500) may include an input interface (510) for receiving user input. The user interface (500) may include a plurality of buttons provided on the refrigerator (2). For example, the input interface (510) may include a temperature control button for controlling the refrigerator temperature, the freezer temperature, etc.

[0200] The plurality of buttons may include a push switch, a membrane switch, and / or a touch switch that is activated by a user's pressing, and / or a touch switch that is activated by a contact with a part of the user's body. In addition, the input interface (510) may include a remote control provided separately from the refrigerator (2) and a receiver that receives a wireless signal from the remote control.

[0201] The output interface (520) can display information regarding the status and operation of the refrigerator (2). The output interface (520) can display information related to the operation of the refrigerator (2) in the form of at least an image or text. The output interface (520) can be provided on the refrigerator (2). Alternatively, the output interface (520) can be provided on a remote controller and a receiver that receives a wireless signal from the remote controller.

[0202] The output interface (520) may be implemented as a liquid crystal display (LCD), a light emitting diode (LED), an organic light emitting diode (OLED), and / or a micro LED. Furthermore, the output interface (52) may be implemented as a touch display. The touch display may include a display panel that displays an image and a touch panel that receives a touch input.

[0203] The control unit (300) can control the operation of the compressor (61) based on user input. The control unit (300) can control whether the compressor (61) is operating and / or the rotation speed, etc. The control unit (300) can control the operation of the compressor (61) so that the refrigerant circulates through the refrigeration cycle.

[0204] In the heat exchanger (100), i.e., the evaporator (100), the refrigerant and the surrounding air can exchange heat. The heat exchanger (100) can cool the surrounding air. The cold air generated in the heat exchanger (100) can be supplied to the storage chamber (90, see FIG. 15). Specifically, the evaporator fan (63) can generate an airflow to supply the cold air generated in the heat exchanger (100) to the storage chamber (90).

[0205] The control unit (300) can control the operation of the evaporator fan (63). The evaporator fan (63) can continuously supply cold air according to the circulation of refrigerant within the refrigeration cycle. The control unit (300) can control the operation of the evaporator fan (63) to be stopped when the heat exchanger (100) is defrosted.

[0206] Depending on the ambient humidity and temperature of the heat exchanger (100), frost may be generated. Frost generated in the heat exchanger (100) may hinder the smooth operation of the heat exchanger (100).

[0207] The frost formed around the heat exchanger (100) needs to be removed. That is, the heat exchanger (100) of the refrigerator (2) may need to be defrosted. A refrigerator (2) according to one embodiment of the present disclosure may include a heat exchanger (100) including a graphene sheet (200).

[0208] The control unit (300) can control the power supply unit (40). The control unit (300) can supply current to the graphene sheet (200) through the electrode (300). The control unit (300) can control the generation of heat in the graphene sheet (200).

[0209] The refrigerator (2) may include a defrosting heater (not shown) to remove frost generated in the heat exchanger (100). During defrosting, heat generated in the defrosting heater (not shown) may be transferred through radiation to melt the frost.

[0210] The control unit (300) can control to remove the heat generated in the heat exchanger (100) by the heat generated in the graphene sheet (200). The control unit (300) can control the defrosting heater (not shown) and / or the power supply unit (40) during defrosting.

[0211] The control unit (300) can control only the power supply unit (40) to operate without operating the defrost heater (not shown). The power supply unit (40) can supply current to the graphene sheet (200) through the electrode (300). The graphene sheet (200) can generate heat by the supplied current. The generated heat can be conducted through the heat exchange fins (120) and / or the graphene coating (210). Frost generated in the heat exchanger (100) can be removed through the heat conducted through the heat exchange fins (120) and / or the graphene coating (210).

[0212] The control unit (300) can control the evaporator fan (63) not to operate during defrosting. In addition, the control unit (300) can control the compressor (61) not to operate during defrosting.

[0213] A heat exchanger (100) according to one embodiment includes a tube (110) through which a refrigerant flows, heat exchange fins (120) coupled to a surface of the tube, a graphene sheet (200) provided to contact at least a portion of the heat exchange fins so that heat is conducted to the heat exchange fins, the graphene sheet including a graphene layer (200a) that receives current to generate heat, and an electrode (300) electrically connected to the graphene layer so as to apply current to the graphene layer.

[0214] It may further include a graphene coating (210) that comes into contact with the graphene sheet so that heat generated in the graphene sheet by the current supplied from the electrode is conducted.

[0215] The graphene coating may be in contact with the heat exchange fins so that heat conducted from the graphene sheet is conducted to the heat exchange fins.

[0216] The graphene coating may be arranged to cover the remaining portion of the heat exchange fins that are not in contact with the graphene sheet.

[0217] The above graphene coating may be provided to cover both the heat exchange fins and the graphene sheet.

[0218] It may further include a power supply unit (40) configured to supply current to the graphene sheet through the electrode.

[0219] The electrode may include a pair of electrodes configured to apply current to the graphene sheet.

[0220] The above pair of electrodes may extend and bend along the heat exchange fins and be spaced apart along the width direction of the heat exchange fins.

[0221] The power supply unit is electrically connected to the heat exchange fins, and the heat exchange fins can be electrically connected to the graphene layer to transmit current supplied from the power supply unit to the graphene layer.

[0222] An air conditioner (1) according to one embodiment includes an outdoor unit (20) having a compressor (11) for compressing a refrigerant, an outdoor heat exchanger (21) arranged to exchange heat between the refrigerant and air, an expansion valve (13) for expanding the refrigerant discharged from the outdoor heat exchanger, and an indoor unit (10) having an indoor heat exchanger (12) arranged to exchange heat between the refrigerant and air, and at least one of the outdoor heat exchanger or the indoor heat exchanger includes a tube (110) through which the refrigerant flows, heat exchange fins (120) coupled to a surface of the tube, a graphene sheet (200) arranged to be in contact with at least a portion of the heat exchange fins so that heat is conducted to the heat exchange fins, and an electrode (300) electrically connected to the graphene sheet so as to apply current to the graphene sheet.

[0223] It may further include a graphene coating (210) that comes into contact with the graphene sheet so that heat generated in the graphene sheet by the current supplied from the electrode is conducted.

[0224] The graphene coating may be arranged to cover the remaining portion of the heat exchange fins that are not in contact with the graphene sheet.

[0225] It may further include a power supply unit (40) configured to supply current to the graphene sheet through the electrode.

[0226] The above power supply unit can supply current to the graphene sheet through the electrode during the defrosting operation.

[0227] It may further include a control unit (30) that operates the compressor or controls the power supply to supply current based on a user's input.

[0228] The above control unit can control the power supply unit to supply current to the graphene sheet through the electrode during the freezing operation.

[0229] The above control unit can control the power supply unit to supply current to the graphene sheet through the electrode during heating operation.

[0230] The above control unit can control the power supply unit to supply current to the graphene sheet while operating the compressor during heating operation.

[0231] A refrigerator (2) according to one embodiment includes a storage compartment (90), and a heat exchanger (100) for generating cold air to supply cold air to the storage compartment, wherein the heat exchanger includes a tube (110) through which a refrigerant flows, heat exchange fins (120) coupled to a surface of the tube, a graphene sheet (200) provided to contact at least a portion of the heat exchange fins so as to conduct heat to the heat exchange fins to remove frost generated on the tube and the heat exchange fins, and an electrode (300) electrically connected to the graphene sheet so as to supply current to the graphene sheet.

[0232] It further includes a graphene coating (210) that is in contact with the graphene sheet so that heat generated in the graphene sheet by the current supplied from the electrode is conducted, and the graphene coating can cover the remaining part of the heat exchange fin that is not in contact with the graphene sheet.

[0233] According to the present disclosure, energy efficiency can be improved without increasing the size of the heat exchanger.

[0234] According to the present disclosure, heat exchange efficiency can be improved by using graphene having good electrical and thermal conductivity.

[0235] According to the present disclosure, the efficiency of the device can be improved by using graphene having good electrical and thermal conductivity.

[0236] The effects according to the idea of ​​the present disclosure are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art to which the present invention pertains from the description below.

[0237] The above illustrates and describes specific embodiments. However, the invention is not limited to the above-described embodiments, and those skilled in the art will readily appreciate that various modifications and implementations can be made without departing from the spirit and scope of the invention as set forth in the claims below.

Claims

1. Tube through which refrigerant flows; Heat exchange fins bonded to the surface of the above tube; A graphene sheet provided to be in contact with at least a portion of the heat exchange fins so that heat is conducted to the heat exchange fins, the graphene sheet including a graphene layer that generates heat by receiving current; and A heat exchanger comprising an electrode electrically connected to the graphene layer so as to apply current to the graphene layer.

2. In paragraph 1, A heat exchanger further comprising a graphene coating in contact with the graphene sheet so that heat generated in the graphene sheet is conducted by a current supplied from the electrode.

3. In paragraph 2, A heat exchanger in which the graphene coating is in contact with the heat exchange fins so that heat conducted from the graphene sheet is conducted to the heat exchange fins.

4. In paragraph 3, A heat exchanger wherein the graphene coating is arranged to cover the remaining portion of the heat exchange fins that are not in contact with the graphene sheet.

5. In paragraph 4, A heat exchanger in which the above graphene coating is provided to cover both the heat exchange fins and the graphene sheet.

6. In paragraph 1, A heat exchanger further comprising a power supply unit configured to supply current to the graphene sheet through the electrode.

7. In paragraph 6, A heat exchanger comprising a pair of electrodes arranged to apply current to the graphene sheet.

8. In paragraph 7, A heat exchanger in which the above pair of electrodes extend and bend along the heat exchange fins and are spaced apart along the width direction of the heat exchange fins.

9. In paragraph 6, The above power supply unit is electrically connected to the heat exchange fins, The heat exchanger is electrically connected to the graphene layer so as to transmit the current supplied from the power supply unit to the graphene layer.

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