Air conditioner defrosting system

Abstract

The invention relates to the technical field of air conditioners, and discloses an air conditioner defrosting system which comprises a compressor used for conveying a high-temperature and high-pressure refrigerant to a first heat exchange device during operation and receiving the refrigerant flowing out of the first heat exchange device; the first heat exchange device is connected with the second heat exchange device, and the first heat exchange device is used for conducting heat exchange with an intermediate medium in the second heat exchange device through a refrigerant; and the second heat exchange device is arranged on a heat exchanger of the air conditioner, an intermediate medium is stored in the second heat exchange device, and the second heat exchange device is used for defrosting the heat exchanger through the intermediate medium. In this way, the defrosting effect can be achieved without switching the operation state of the air conditioner, fluctuation of the indoor temperature is reduced, and the air conditioner using experience of a user is improved.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioning, for example, to an air conditioning defrosting system. Background Art

[0002] At present, when the air conditioner is running in winter for heating, the air conditioner outdoor unit absorbs heat from the outdoor air, and the temperature around the outdoor heat exchanger is low, so the water vapor in the air will condense into frost and adhere to the surface of the outdoor heat exchanger. Thick frost will reduce the heat exchange capacity of the air conditioner outdoor unit, thereby reducing the heating efficiency of the air conditioner. The existing technology is to switch the air conditioner operation state to the refrigeration cycle mode, so that the high-temperature and high-pressure refrigerant discharged by the compressor is discharged into the air conditioner outdoor unit through the four-way reversing valve to melt the frost layer on the air conditioner outdoor unit.

[0003] In the process of implementing the embodiments of the present disclosure, it is found that there are at least the following problems in the related art:

[0004] Since the air conditioner switches from a heating cycle to a cooling cycle during the defrosting process, the indoor temperature fluctuates greatly, resulting in a poor air conditioning experience.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0006] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0007] The embodiments of the present disclosure provide an air-conditioning defrosting system to reduce the fluctuation of indoor temperature during the defrosting process.

[0008] In some embodiments, the air conditioning defrost system includes: a compressor, which is used to transport high-temperature and high-pressure refrigerant to a first heat exchange device during operation, and receive the refrigerant flowing out of the first heat exchange device; a first heat exchange device, which is connected to a second heat exchange device, and the first heat exchange device is used to use the refrigerant to exchange heat with an intermediate medium in the second heat exchange device; a second heat exchange device, which is arranged on the heat exchanger of the air conditioner, and the second heat exchange device stores an intermediate medium, and the second heat exchange device is used to use the intermediate medium to defrost the heat exchanger.

[0009] In some embodiments, the second heat exchange device includes a constant temperature water tank, a heat exchange coil and a water pump; the heat exchange coil is arranged on the heat exchanger and connected to the first heat exchange device; the constant temperature water tank is used to store the constant temperature intermediate medium; the water pump is arranged in the constant temperature water tank, and is used to inject the constant temperature intermediate medium into the heat exchange coil.

[0010] In some embodiments, the air conditioning defrost system further includes: an image acquisition device electrically connected to the controller, for acquiring and sending image information of the heat exchanger to the controller; the controller is used to determine the frosting condition of the heat exchanger based on the image information; the frosting condition is used to characterize whether the heat exchanger is frosted or not.

[0011] In some embodiments, the air conditioning defrost system further includes: a frost layer thickness detection device electrically connected to the controller, and the frost layer thickness detection device is used to obtain and send the frost layer thickness of the heat exchanger to the controller.

[0012] In some embodiments, the air conditioning defrost system further includes: a temperature sensor electrically connected to the controller, for detecting and sending the outdoor ambient temperature to the controller.

[0013] In some embodiments, the air conditioning defrost system further includes: a humidity sensor electrically connected to the controller, for detecting and sending the outdoor environmental humidity to the controller.

[0014] In some embodiments, the air conditioning defrost system further includes: a flow valve, which is arranged on the second heat exchange device, the flow valve is electrically connected to the controller, and the flow valve is used to control the flow rate of the intermediate medium in the second heat exchange device.

[0015] In some embodiments, the air conditioning defrost system further includes: a flow valve, which is arranged on the second heat exchange device, the flow valve is electrically connected to the controller, and the flow valve is used to control the flow rate of the intermediate medium in the second heat exchange device.

[0016] The air conditioner defrosting system provided by the embodiment of the present disclosure can achieve the following technical effects: Since the refrigerant discharged from the compressor is always at high temperature and high pressure during operation. Therefore, when the refrigerant flows from the compressor into the first heat exchange device, it is possible to exchange heat with the intermediate medium in the second heat exchange device. Since the second heat exchange device is arranged on the heat exchanger, the surface of the heat exchanger can be heated to perform defrosting. In this process, the defrosting effect can be achieved without switching the operating state of the air conditioner, thereby reducing the fluctuation of the indoor temperature and improving the user's experience of using the air conditioner.

[0017] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0019] Figure 1 is a schematic diagram of an air conditioning defrosting system provided by an embodiment of the present disclosure;

[0020] Figure 2 is a schematic diagram of another air conditioning defrosting system provided by an embodiment of the present disclosure;

[0021] Figure 3 is a schematic diagram of another air conditioning defrosting system provided by an embodiment of the present disclosure;

[0022] Figure 4 is a schematic diagram of another air conditioning defrosting system provided by an embodiment of the present disclosure;

[0023] Figure 5 is a schematic diagram of another air conditioning defrosting system provided by an embodiment of the present disclosure;

[0024] Figure 6 It is a schematic diagram of another air conditioning defrost system provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0025] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0026] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0027] Unless otherwise stated, the term "plurality" means two or more.

[0028] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B indicates: A or B.

[0029] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0030] The term "correspondence" may refer to an association relationship or a binding relationship. The correspondence between A and B means that there is an association relationship or a binding relationship between A and B.

[0031] Combination Figure 1 As shown, the embodiment of the present disclosure provides an air conditioning defrosting system 100, including a compressor 101, a first heat exchange device 102, and a second heat exchange device 103. The compressor 101 is used to deliver high-temperature and high-pressure refrigerant to the first heat exchange device 102 during operation, and receive the refrigerant flowing out of the first heat exchange device 102. The first heat exchange device 102 is connected to the second heat exchange device 103, and the first heat exchange device 102 is used to use the refrigerant to perform heat exchange with the intermediate medium in the second heat exchange device 103. The second heat exchange device 103 is arranged on the heat exchanger 111, and the second heat exchange device 103 stores the intermediate medium. The second heat exchange device 103 is used to defrost the heat exchanger 111 using the intermediate medium.

[0032] The air conditioner defrosting system provided by the embodiment of the present disclosure is adopted. When the air conditioner is running, the refrigerant flows into the first heat exchange device to exchange heat with the intermediate medium in the second heat exchange device. Since the second heat exchange device is arranged on the heat exchanger and the refrigerant flowing out of the compressor is a high-temperature and high-pressure gas. Therefore, when the refrigerant flows from the compressor into the first heat exchange device, the temperature of the intermediate medium in the second heat exchange device will rise accordingly, thereby achieving the effect of heating and defrosting the surface of the heat exchanger. In this process, since the refrigerant discharged by the compressor is always at a high temperature and high pressure, the refrigerant received by the first heat exchange device is always at a high temperature and high pressure. Therefore, the technical effect of defrosting the heat exchanger can be achieved without changing the operating mode of the air conditioner, thereby reducing the fluctuation of the indoor ambient temperature and improving the user's experience of using the air conditioner.

[0033] Optionally, combined Figure 2 As shown, the air conditioner defrosting system 100 further includes: a controller 104 and an image acquisition device 105. The image acquisition device 105 is electrically connected to the controller 104, and the image acquisition device 105 is used to acquire and send image information of the heat exchanger to the controller 104. The controller 104 is used to determine the frosting condition of the heat exchanger according to the image information, wherein the frosting condition is used to characterize whether the heat exchanger is frosted or not frosted.

[0034] Furthermore, upon receiving a frost condition acquisition instruction sent by the controller, the image acquisition device acquires and sends image information of the heat exchanger to the controller.

[0035] Furthermore, when the air conditioner is in the heating operation state or the non-operating state, and when the outdoor ambient temperature is less than the preset temperature and the outdoor ambient humidity is less than the preset humidity, the controller sends a frost condition acquisition instruction to the image acquisition device. Since the air conditioner is operating in the heating mode, the outdoor heat exchanger of the air conditioner absorbs heat in the air and reduces the surface temperature of the outdoor heat exchanger. At this time, if the outdoor ambient temperature is low and the outdoor ambient humidity is high, then frost is likely to appear on the surface of the outdoor heat exchanger. Therefore, by obtaining the frost condition of the heat exchanger only when the outdoor ambient temperature is less than the preset temperature and the outdoor ambient humidity is less than the preset humidity, unnecessary detection steps can be reduced. When the air conditioner is operating in the command mode, the high-temperature and high-pressure refrigerant discharged by the compressor will flow to the outdoor unit of the air conditioner through the four-way reversing valve, thereby heating the heat exchanger. In this way, the surface temperature of the heat exchanger is high and the possibility of frost is extremely small.

[0036] Optionally, combined Figure 3 As shown, the air conditioning defrosting system 100 further includes: a humidity sensor 106 and a temperature sensor 107. The humidity sensor 106 and the temperature sensor 107 are both electrically connected to the controller 104. The temperature sensor 107 is used to detect and send the outdoor ambient temperature to the controller 104. The humidity sensor 106 is used to detect and send the outdoor ambient humidity to the controller 104.

[0037] Further, the temperature sensor feeds back the detected outdoor environment temperature when receiving the temperature acquisition instruction sent by the controller. The humidity sensor feeds back the detected outdoor environment humidity when receiving the humidity acquisition instruction sent by the controller.

[0038] In some embodiments, the outdoor ambient temperature is the temperature of the area where the air conditioner outdoor unit is located. The outdoor ambient humidity is the humidity of the area where the air conditioner outdoor unit is located.

[0039] Optionally, the controller is further configured to determine whether the air conditioner is in operation when the frosting condition is frosting of the heat exchanger, and to control the operation of the air conditioner when the air conditioner is not in operation.

[0040] Optionally, combined Figure 4 As shown, the air conditioner defrosting system further includes a regulating valve 108, which is arranged between the compressor and the first heat exchange device. The regulating valve 108 is electrically connected to the controller 104. When the frosting condition is that the heat exchanger is frosted, the controller 104 controls the regulating valve 108 to open so that the refrigerant flows from the compressor into the first heat exchange device.

[0041] Optionally, combined Figure 5As shown, the air conditioner defrosting system 100 further includes a frost layer thickness detection device 109, which is electrically connected to the controller 104. The frost layer thickness detection device 109 is used to obtain and send the frost thickness of the heat exchanger to the controller 104.

[0042] Further, the frost layer thickness detection device obtains the frost thickness of the heat exchanger when receiving the thickness detection instruction sent by the controller. Further, when the frosting condition is that the heat exchanger is frosted, the controller sends a thickness detection instruction to the frost layer thickness detection device.

[0043] In some embodiments, the frost layer thickness detection device is an ultrasonic thickness gauge. When there is only one frost layer thickness detection device, the frost thickness fed back by the frost layer thickness detection device is directly determined as the frost layer thickness of the heat exchanger. When there are multiple frost layer thickness detection devices, the average value of the frost thickness fed back by the multiple frost layer thickness detection devices is determined as the frost layer thickness of the heat exchanger.

[0044] Optionally, combined Figure 6 As shown, the air conditioning defrosting system 100 further includes a flow valve 110, which is disposed on the second heat exchange device 103, and is electrically connected to the controller 104, and is used to control the flow rate of the intermediate medium in the second heat exchange device. Further, the flow valve is controlled by the controller to be opened or closed.

[0045] Optionally, the second heat exchange device includes a constant temperature water tank, a heat exchange coil, a water pump and a flow valve. The heat exchange coil is arranged on the heat exchanger and connected to the first heat exchange device. The constant temperature water tank is used to store a constant temperature intermediate medium. The water pump is arranged in the constant temperature water tank and is used to inject the constant temperature intermediate medium into the heat exchange coil. The flow valve is arranged on the heat exchange coil and is used to control the flow rate of the intermediate medium in the heat exchange coil. Among them, the temperature of the constant temperature intermediate medium is greater than the temperature at which the intermediate medium condenses into ice. In this way, the probability of the intermediate medium freezing in the heat exchange coil can be reduced, thereby reducing the probability of blockage of the heat exchange coil.

[0046] In some embodiments, the intermediate medium is water.

[0047] Furthermore, when the temperature of the intermediate medium in the heat exchange coil is greater than the target temperature, the controller controls the flow valve to open. In this way, part of the intermediate medium can be heated intensively, so that the intermediate medium reaches the target temperature more quickly. At the same time, by using the intermediate medium that reaches the target temperature to heat the heat exchanger surface, frost can be defrosted more quickly.

[0048] Further, the controller determines the target temperature according to the thickness of the frost layer of the heat exchanger. In some embodiments, determining the target temperature according to the thickness of the frost layer of the heat exchanger includes: matching the target temperature corresponding to the frost thickness in a preset first database. The first database stores the corresponding relationship between the frost thickness and the target temperature. The higher the target temperature, the greater the corresponding frost thickness.

[0049] In some embodiments, when the thickness of the frost layer is less than or equal to 1 mm, the target temperature corresponding to the frost layer thickness is 40 degrees Celsius. When the thickness of the frost layer is greater than 1 mm and less than or equal to 5 mm, the target temperature corresponding to the frost layer thickness is 70 degrees Celsius. When the thickness of the frost layer is greater than 5 mm, the target temperature corresponding to the frost layer thickness is 90 degrees Celsius.

[0050] Further, the controller controls the flow valve to open, including: determining a target valve opening according to the thickness of the frost layer. Triggering the flow valve to open according to the target valve opening. Since the opening of the flow valve affects the flow speed of the intermediate medium in the second heat exchange device, thereby affecting the heating speed of the heat exchanger by the second heat exchange device. Therefore, by determining the target valve opening according to the thickness of the frost layer, the target valve opening can change with the change of the frost layer thickness, so that defrosting can be completed more quickly.

[0051] Further, the controller determines the target valve opening according to the frost layer thickness in the following manner: matching the target valve opening corresponding to the frost layer thickness in a preset second database. The second database stores the corresponding relationship between the frost layer thickness and the target valve opening.

[0052] In some embodiments, when the frost layer thickness is less than or equal to 1 mm, the target valve opening corresponding to the frost layer thickness is half open. When the frost layer thickness is greater than 1 mm, the target valve opening corresponding to the frost layer thickness is fully open.

[0053] Optionally, after the controller triggers the flow valve to open, it also includes: determining an interval time according to the thickness of the frost layer, monitoring the frosting condition of the heat exchanger in real time after the interval time is reached, and controlling the regulating valve and the flow valve to close when the heat exchanger is not frosted. Since the thicker the frost layer, the longer the corresponding defrosting time is usually, it is not necessary to detect the thickness of the frost layer when it is known that the thickness of the frost layer on the heat exchanger is large. Therefore, by determining the interval time according to the thickness of the frost layer and monitoring the frosting condition of the heat exchanger after the interval time is reached, unnecessary detection steps can be reduced, thereby saving energy.

[0054] Furthermore, the controller determines the interval time according to the thickness of the frost layer in the following manner: the interval time corresponding to the thickness of the frost layer is matched in a preset third database. The third database stores the corresponding relationship between the thickness of the frost layer and the interval time.

[0055] In some embodiments, when the frost layer thickness is less than or equal to 1 mm, the interval time corresponding to the frost layer thickness is 20 minutes. When the frost layer thickness is greater than 1 mm and less than or equal to 5 mm, the interval time corresponding to the frost layer thickness is 30 minutes. When the frost layer thickness is greater than 5 mm, the interval time corresponding to the frost layer thickness is 30 minutes.

[0056] The technical solution of the embodiment of the present disclosure can be embodied in the form of a software product, which is stored in a storage medium and includes one or more instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in the embodiment of the present disclosure. The aforementioned storage medium may be a non-transient storage medium, including: a USB flash drive, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a disk or an optical disk, and other media that can store program codes, or a transient storage medium.

[0057] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process and other changes. The embodiments represent only possible changes. Unless explicitly required, separate components and functions are optional, and the order of operation may vary. The parts and features of some embodiments may be included in or replace the parts and features of other embodiments. Moreover, the words used in this application are only used to describe the embodiments and are not used to limit the claims. As used in the description of the embodiments and the claims, unless the context clearly indicates, the singular forms of "a", "an" and "the" are intended to include plural forms as well. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of listings containing one or more associated ones. In addition, when used in the present application, the term "comprise" and its variants "comprises" and / or comprising refer to the presence of stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the presence of other identical elements in the process, method or device comprising the elements. In this article, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the various embodiments may refer to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, then the relevant parts can refer to the description of the method part.

[0058] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software may depend on the specific application and design constraints of the technical solution. The technicians may use different methods for each specific application to implement the described functions, but such implementations should not be considered to exceed the scope of the embodiments of the present disclosure. The technicians may clearly understand that, for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above may refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here.

[0059] In the embodiments disclosed herein, the disclosed methods and products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units can be only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between each other shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to implement this embodiment. In addition, each functional unit in the embodiment of the present disclosure may be integrated in a processing unit, or each unit may exist physically alone, or two or more units may be integrated in one unit.

[0060] The flowchart and block diagram in the accompanying drawings show the possible architecture, function and operation of the system, method and computer program product according to the embodiment of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. In the description corresponding to the flowchart and the block diagram in the accompanying drawings, the operations or steps corresponding to different boxes can also occur in a different order from the order disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. Each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented by a dedicated hardware-based system that performs the specified functions or actions, or may be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. An air conditioning defrosting system, characterized in that: include: The compressor is used to deliver high-temperature and high-pressure refrigerant to the first heat exchange device during operation, and receive the refrigerant flowing out of the first heat exchange device; a first heat exchange device connected to the second heat exchange device, wherein the first heat exchange device is used to perform heat exchange with an intermediate medium in the second heat exchange device using a refrigerant; The second heat exchange device is arranged on the heat exchanger of the air conditioner. An intermediate medium is stored in the second heat exchange device. The second heat exchange device is used to defrost the heat exchanger using the intermediate medium.

2. The air conditioning defrosting system according to claim 1, characterized in that: The second heat exchange device includes a constant temperature water tank, a heat exchange coil and a water pump; the heat exchange coil is arranged on the heat exchanger and connected to the first heat exchange device; the constant temperature water tank is used to store the constant temperature intermediate medium; the water pump is arranged in the constant temperature water tank, and is used to inject the constant temperature intermediate medium into the heat exchange coil.

3. The air conditioning defrosting system according to claim 1, characterized in that: Also includes: An image acquisition device, electrically connected to the controller, for acquiring and sending image information of the heat exchanger to the controller; The controller is used to determine the frosting condition of the heat exchanger according to the image information; the frosting condition is used to characterize whether the heat exchanger is frosted or not.

4. The air conditioning defrosting system according to claim 3, characterized in that: Also includes: The frost layer thickness detection device is electrically connected to the controller, and is used to obtain and send the frost layer thickness of the heat exchanger to the controller.

5. The air conditioning defrosting system according to claim 4, characterized in that: The controller is also used to trigger the frost layer thickness detection device to obtain the frost layer thickness of the heat exchanger when the frosting condition is that the heat exchanger is frosted.

6. The air conditioning defrosting system according to claim 3, characterized in that: Also includes: The temperature sensor is electrically connected to the controller and is used to detect and send the outdoor ambient temperature to the controller.

7. The air conditioning defrosting system according to claim 3, characterized in that: Also includes: The humidity sensor is electrically connected to the controller and is used to detect and send the outdoor environment humidity to the controller.

8. The air conditioning defrosting system according to claim 3, characterized in that: Also includes: The flow valve is arranged on the second heat exchange device, the flow valve is electrically connected to the controller, and the flow valve is used to control the flow rate of the intermediate medium in the second heat exchange device.

9. The air conditioning defrosting system according to claim 3, characterized in that: Also includes: The flow valve is arranged on the second heat exchange device, the flow valve is electrically connected to the controller, and the flow valve is used to control the flow rate of the intermediate medium in the second heat exchange device.

10. The air conditioning defrosting system according to claim 9, characterized in that: The controller is also used to control the flow valve to open when the temperature of the intermediate medium is greater than the target temperature.

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