Air conditioner and anti-condensation control method thereof

Abstract

The present invention discloses an air conditioner and an anti-condensation control method thereof. The air conditioner includes: a radiant cooling system comprising a compressor, a four-way valve, a capillary network, a throttling device, and an outdoor heat exchanger; a pressure sensor for detecting the low pressure of the radiant cooling system; a wet-bulb temperature sensor for detecting the indoor wet-bulb temperature; and a controller for: obtaining the wet-bulb temperature when the compressor is turned on for a preset time; obtaining the saturation temperature corresponding to the low pressure when the wet-bulb temperature is detected to be less than a preset wet-bulb temperature safety value; controlling the compressor to reduce frequency if the saturation temperature is detected to be less than a preset temperature lower limit; and controlling the compressor to increase frequency if the saturation temperature is detected to be greater than a preset temperature upper limit. The embodiments of the present invention can solve the problem of condensation easily forming at the lowest temperature point of the capillary network in an air conditioner, causing the air conditioner to malfunction.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to an air conditioner and an anti-condensation control method thereof. Background Art

[0002] Currently, air conditioners using radiant cooling technology experience condensation and dripping around the capillary tubes if the actual evaporation temperature of the capillary tube network falls below the wet-bulb temperature of the surrounding environment, causing the air conditioner to malfunction. Existing air conditioners using radiant cooling technology primarily rely on thermocouples placed along the capillary tube network to measure the evaporation temperature, thereby controlling the evaporation temperature above the wet-bulb temperature of the surrounding environment to prevent condensation. However, due to the large variations in evaporation temperature along the capillary tube network and the long length of the tube, it is impossible to measure the lowest temperature of the capillary tube network using thermocouples. The evaporation temperature measured by the thermocouples is often higher than the lowest temperature of the capillary tube network. Consequently, condensation easily forms at the lowest temperature point of the capillary tube network when the air conditioner is running for extended periods, causing the air conditioner to malfunction. Summary of the Invention

[0003] The embodiment of the present invention provides an air conditioner and an anti-condensation control method thereof, which can solve the problem that condensation is easily generated at the lowest temperature point of the capillary network of the air conditioner, causing the air conditioner to be unable to be used normally.

[0004] The air conditioner provided in the first embodiment of the present invention includes:

[0005] The radiant cooling system consists of a compressor, a four-way valve, a capillary network, a throttling device and an outdoor heat exchanger;

[0006] a pressure sensor, which is provided on the connecting pipeline between the four-way valve and the capillary network, or on the pipeline at the suction port of the compressor, and is used to detect the low pressure of the radiant refrigeration system;

[0007] Wet-bulb temperature sensor, used to detect indoor wet-bulb temperature;

[0008] Controller for:

[0009] When the compressor is turned on for a preset time, obtaining the wet-bulb temperature;

[0010] When it is detected that the wet-bulb temperature is lower than a preset wet-bulb temperature safety value, obtaining the saturation temperature corresponding to the low pressure;

[0011] If it is detected that the saturation temperature is lower than the preset temperature lower limit, controlling the compressor to reduce the frequency;

[0012] If it is detected that the saturation temperature is greater than a preset temperature upper limit, the compressor is controlled to increase the frequency.

[0013] In the air conditioner provided in the first embodiment of the present invention, when the controller detects that the indoor wet-bulb temperature is less than a preset wet-bulb temperature safety value, it determines the lowest evaporation temperature based on the saturation temperature corresponding to the low pressure of the radiant cooling system. This controls the compressor to reduce frequency when the saturation temperature is less than the preset lower limit, and to reduce frequency when the saturation temperature is less than the preset lower limit. Consequently, the cooling capacity can be reduced when the saturation temperature is low, keeping the evaporation temperature at the capillary network above the dew point, thereby preventing condensation at the lowest temperature point in the capillary network and ensuring normal operation of the air conditioner. Simultaneously, the cooling capacity of the compressor can be increased when the saturation temperature is high, ensuring cooling efficiency and shortening the dry-bulb temperature drop time.

[0014] The air conditioner provided in the second embodiment of the present invention further includes a dehumidifying device; wherein,

[0015] The dehumidification device is used to reduce indoor humidity;

[0016] Then, the controller is further configured to:

[0017] When it is detected that the wet-bulb temperature is greater than or equal to the preset wet-bulb temperature safety value, the compressor is controlled to stop running, and the dehumidification device is controlled to start, until it is detected that the wet-bulb temperature is less than the preset wet-bulb temperature safety value, and the dehumidification device is controlled to stop running.

[0018] In the air conditioner provided in the second embodiment of the present invention, since the controller controls the compressor to stop running and controls the dehumidification device to start when detecting that the wet-bulb temperature is greater than or equal to the preset wet-bulb temperature safety value, it is possible to dehumidify the room when the indoor wet-bulb temperature is too high to reduce the indoor humidity and avoid the indoor wet-bulb temperature being higher than the temperature of the wall, etc. of the built-in radiant cooling system, causing condensation on the wall, etc., and damaging the wall, etc.

[0019] In the air conditioner provided in the third embodiment of the present invention, if it is detected that the saturation temperature is less than a preset temperature lower limit, the compressor is controlled to reduce the frequency, specifically:

[0020] If it is detected that the saturation temperature is lower than the preset temperature lower limit, the frequency of the compressor is decreased according to the first time period during which the saturation temperature is lower than the preset temperature lower limit and the first preset frequency adjustment amount to control the compressor to reduce the frequency.

[0021] In the air conditioner provided in the third embodiment of the present invention, since the controller decreases the frequency of the compressor according to the first time period during which the saturation temperature is less than the preset temperature lower limit and the first preset frequency adjustment amount when detecting that the saturation temperature is less than the preset temperature lower limit, so as to control the compressor to reduce the frequency, the frequency of the compressor can be gradually reduced to an appropriate frequency to control the evaporation temperature of the capillary network within a suitable range, thereby avoiding condensation in the air conditioner at the lowest temperature of the capillary network, and ensuring the normal operation of the air conditioner.

[0022] In the air conditioner provided in a fourth embodiment of the present invention, if it is detected that the saturation temperature is greater than a preset temperature upper limit, the compressor frequency is controlled to increase, specifically:

[0023] If it is detected that the saturation temperature is greater than the preset temperature upper limit, the frequency of the compressor is increased according to the second time period during which the saturation temperature is greater than the temperature upper limit and the second preset frequency adjustment amount to control the compressor to increase the frequency.

[0024] In the air conditioner provided in the fourth embodiment of the present invention, since the controller increases the frequency of the compressor based on the second time period during which the saturation temperature is greater than the temperature upper limit and the second preset frequency adjustment amount when detecting that the saturation temperature is greater than the temperature upper limit, so as to control the compressor to increase the frequency, the frequency of the compressor can be increased to an appropriate frequency to ensure the cooling effect and shorten the dry-bulb temperature drop time, thereby avoiding the dry-bulb temperature from failing to drop to the set temperature for a long time due to insufficient cooling capacity.

[0025] The air conditioner provided in the fifth embodiment of the present invention further includes a dry-bulb temperature sensor; wherein,

[0026] The dry-bulb temperature sensor is used to detect the indoor dry-bulb temperature;

[0027] Then, the controller is further configured to:

[0028] obtaining the dry-bulb temperature, and controlling the compressor to turn on when the dry-bulb temperature is greater than a target temperature;

[0029] If it is detected that the dry-bulb temperature drops to a lower limit of the temperature corresponding to the target temperature, the compressor is controlled to stop running.

[0030] In the air conditioner provided in the fifth embodiment of the present invention, the controller controls the compressor to start when the dry-bulb temperature is greater than the target temperature, and controls the compressor to stop when the dry-bulb temperature is detected to have dropped to the lower limit of the temperature corresponding to the target temperature. Therefore, the dry-bulb temperature can be maintained between the target temperature and the corresponding lower limit, thereby ensuring the cooling effect of the air conditioner.

[0031] In the air conditioner provided in the sixth embodiment of the present invention, the controller is further configured to:

[0032] If it is detected that the saturation temperature is less than or equal to the preset temperature upper limit value, and the saturation temperature is greater than or equal to the preset temperature lower limit value, the compressor is controlled to maintain the current frequency.

[0033] In the air conditioner provided in the sixth embodiment of the present invention, since the controller controls the compressor to maintain the current frequency unchanged when detecting that the saturation temperature is between the preset temperature upper limit value and the preset temperature lower limit value, it is possible to avoid detection errors and slight temperature fluctuations from affecting the anti-condensation control of the radiant refrigeration system.

[0034] A seventh embodiment of the present invention provides an anti-condensation control method for an air conditioner, wherein the air conditioner includes a radiant cooling system, a pressure sensor, and a wet-bulb temperature sensor; wherein the radiant cooling system is composed of a compressor, a four-way valve, a capillary network, a throttling device, and an outdoor heat exchanger; the pressure sensor is provided on a connecting pipe between the four-way valve and the capillary network, or on a pipe at the suction port of the compressor, and is used to detect the low pressure of the radiant cooling system; the wet-bulb temperature sensor is used to detect the indoor wet-bulb temperature; and the method includes:

[0035] When the compressor is turned on for a preset time, the indoor wet-bulb temperature is obtained;

[0036] When it is detected that the wet-bulb temperature is less than a preset wet-bulb temperature safety value, obtaining a saturation temperature corresponding to a low pressure of the radiant cooling system;

[0037] If it is detected that the saturation temperature is lower than the preset temperature lower limit, the compressor is controlled to reduce the frequency;

[0038] If it is detected that the saturation temperature is greater than a preset temperature upper limit, the compressor is controlled to increase the frequency.

[0039] In the air conditioner anti-condensation control method provided in the seventh embodiment of the present invention, when the indoor wet-bulb temperature is detected to be less than a preset wet-bulb temperature safety value, the lowest evaporation temperature is determined based on the saturation temperature corresponding to the low pressure of the radiant cooling system. This controls the compressor to reduce frequency when the saturation temperature is less than the preset lower limit, and to reduce frequency when the saturation temperature is less than the preset lower limit. Consequently, the cooling capacity can be reduced when the saturation temperature is low, keeping the evaporation temperature at the capillary network above the dew point, thereby preventing condensation at the lowest temperature point in the capillary network and ensuring normal operation of the air conditioner. Simultaneously, the cooling capacity of the compressor can be increased when the saturation temperature is high, ensuring cooling efficiency and shortening the dry-bulb temperature drop time.

[0040] In an eighth embodiment of the present invention, an anti-condensation control method for an air conditioner is provided, wherein the air conditioner further includes a dehumidification device; wherein the dehumidification device is used to reduce indoor humidity; then, the method further includes:

[0041] When it is detected that the wet-bulb temperature is greater than or equal to the preset wet-bulb temperature safety value, the compressor is controlled to stop running, and the dehumidification device is controlled to start until it is detected that the wet-bulb temperature is less than the preset wet-bulb temperature safety value, and the dehumidification device is controlled to stop running.

[0042] In the anti-condensation control method for the air conditioner provided in the eighth embodiment of the present invention, since when it is detected that the wet-bulb temperature is greater than or equal to the preset wet-bulb temperature safety value, the compressor is controlled to stop running, and the dehumidification device is controlled to start. Therefore, when the indoor wet-bulb temperature is too high, the room can be dehumidified to reduce the indoor humidity and avoid the indoor wet-bulb temperature being higher than the temperature of the wall, etc. of the built-in radiant refrigeration system, causing condensation on the wall, etc., and damaging the wall, etc.

[0043] In a ninth embodiment of the present invention, a method for controlling condensation prevention of an air conditioner is provided, wherein if it is detected that the saturation temperature is less than a preset temperature lower limit, the compressor is controlled to reduce the frequency, specifically:

[0044] If it is detected that the saturation temperature is lower than the preset temperature lower limit, the frequency of the compressor is decreased according to the first time period during which the saturation temperature is lower than the preset temperature lower limit and the first preset frequency adjustment amount to control the compressor to reduce the frequency.

[0045] In the anti-condensation control method for an air conditioner provided in the ninth embodiment of the present invention, when it is detected that the saturation temperature is lower than the preset temperature lower limit value, the frequency of the compressor is gradually reduced according to the first time period during which the saturation temperature is lower than the preset temperature lower limit value and the first preset frequency adjustment amount to control the compressor to reduce the frequency. Therefore, the frequency of the compressor can be gradually reduced to an appropriate frequency to control the evaporation temperature of the capillary network within a suitable range, thereby avoiding condensation of the air conditioner at the lowest temperature of the capillary network to ensure the normal operation of the air conditioner.

[0046] In a tenth embodiment of the present invention, an anti-condensation control method for an air conditioner is provided, wherein if it is detected that the saturation temperature is greater than a preset upper temperature limit, the compressor frequency is controlled to increase, specifically:

[0047] If it is detected that the saturation temperature is greater than the preset temperature upper limit, the frequency of the compressor is increased according to the second time period during which the saturation temperature is greater than the temperature upper limit and the second preset frequency adjustment amount to control the compressor to increase the frequency.

[0048] In the anti-condensation control method for an air conditioner provided in the tenth embodiment of the present invention, since when it is detected that the saturation temperature is greater than the preset temperature upper limit value, the frequency of the compressor is increased incrementally according to the second time period during which the saturation temperature is greater than the temperature upper limit value and the second preset frequency adjustment amount to control the compressor to increase the frequency, the frequency of the compressor can be increased to an appropriate frequency to ensure the cooling effect and shorten the dry-bulb temperature drop time, thereby avoiding the dry-bulb temperature from failing to drop to the set temperature for a long time due to insufficient cooling capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a structural diagram of a first radiative cooling system provided by an embodiment of the present invention.

[0050] Figure 2 It is a structural diagram of a second radiant cooling system provided in one embodiment of the present invention.

[0051] Figure 3 The figure is a schematic structural diagram of an air conditioner anti-condensation device provided by one embodiment of the present invention.

[0052] Figure 4 It is a structural schematic diagram of another air conditioner anti-condensation device provided by one embodiment of the present invention.

[0053] Figure 5 It is a structural diagram of a first air conditioner control system provided by an embodiment of the present invention.

[0054] Figure 61 is a structural diagram of a second air conditioner control system provided by an embodiment of the present invention.

[0055] Figure 7 This is a workflow diagram of anti-condensation control performed by a first controller provided by an embodiment of the present invention.

[0056] Figure 8 1 is a schematic structural diagram of a third air conditioner control system provided by an embodiment of the present invention.

[0057] Figure 9 This is a flowchart of the anti-condensation control process of the second controller provided by one embodiment of the present invention.

[0058] Figure 10 The figure is a flow chart of an anti-condensation control method for an air conditioner provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0060] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0061] The terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features specified as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0062] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0063] See also Figure 1 , is a structural diagram of a radiative cooling system provided by one embodiment of the present invention.

[0064] The air conditioner provided in the embodiment of the present invention includes a radiant cooling system; wherein the radiant cooling system is composed of a compressor 1, a four-way valve 2, a capillary network 3, a throttling device 4 and an outdoor heat exchanger 5. The air conditioner performs a refrigeration cycle of the air conditioner by using the compressor 1, the four-way valve 2, the capillary network 3, the throttling device 4 and the outdoor heat exchanger 5. Specifically, Figure 1As shown, in the air conditioner, the discharge port of compressor 1 is connected to the first end of four-way valve 2. The second end of four-way valve 2 is connected to the first end of throttling device 4 via capillary tube network 3. The second end of throttling device 4 is connected to the third end of four-way valve 2 via outdoor heat exchanger 5. The fourth end of four-way valve 2 is connected to the suction port of compressor 1. The capillary tube network 3 and outdoor heat exchanger 5 function as a condenser or evaporator. The outdoor heat exchanger 5 has a first inlet and outlet for circulating refrigerant (coolant) between the suction port of compressor 1 and a second inlet and outlet for circulating refrigerant between the throttling device 4. The outdoor heat exchanger 5 is used to exchange heat between the refrigerant flowing in the heat transfer tube connected between the second inlet and the first inlet of the outdoor heat exchanger 5 and the outdoor air. The capillary tube network 3 has a second inlet and outlet for circulating liquid refrigerant between the throttling device 4 and a first inlet and outlet for circulating gaseous refrigerant between the discharge port of compressor 1. The capillary tube network 3 is used to exchange heat between the refrigerant flowing in the heat transfer tubes connected between the second inlet and the first inlet of the capillary tube network 3 and the indoor air. The throttle device 4 has the function of expanding and reducing the pressure of the refrigerant flowing between the outdoor heat exchanger 5 and the capillary tube network 3. The opening of the throttle device 4 can be changed by the air conditioner controller 10. Reducing the opening of the throttle device 4 increases the flow resistance of the refrigerant through the throttle device 4, while increasing the opening of the throttle device 4 reduces the flow resistance of the refrigerant through the throttle device 4. Therefore, during heating operation, the throttle device 4 expands and reduces the pressure of the refrigerant flowing from the capillary tube network 3 to the outdoor heat exchanger 5. Preferably, the throttle device 4 is an electronic expansion valve. It should be noted that even if the status of other components installed in the radiant cooling system remains unchanged, the flow rate of the refrigerant flowing in the radiant cooling system will also change when the opening of the throttle device 4 changes. In addition, a liquid accumulator 6 is disposed between the outdoor heat exchanger 5 and the suction inlet of the compressor 1. In the liquid accumulator 6, the refrigerant flowing from the outdoor heat exchanger 5 to the compressor 1 is separated into gaseous refrigerant and liquid refrigerant, and the gaseous refrigerant is mainly supplied from the liquid accumulator 6 to the suction port of the compressor 1. The four-way valve 2 can change the state of the controller 10 to change the refrigerant flow direction in the radiant refrigeration system, thereby realizing the switching of the cooling, heating and other functions of the air conditioner. In simple terms, the refrigeration principle of the radiant refrigeration system is as follows: the high-temperature and high-pressure gas refrigerant discharged from the exhaust of the compressor 1 enters the condenser and condenses, releasing heat to the environment. The refrigerant is cooled to a high-pressure liquid, throttled and reduced in pressure by the throttling device 4, and then evaporated in the capillary network 3, absorbing the heat around the capillary network 3 and lowering its temperature, thereby radiating cooling to the heat source in the building environment. After the refrigerant evaporates, the gas returns to the compressor 1 to complete the refrigeration cycle.

[0065] Further, see Figure 2The radiant cooling system further includes a filter 7, wherein the filter 7 is arranged between the throttling device 4 and the outdoor heat exchanger 5, and the filter 7 is used to filter impurities in the pipeline of the radiant cooling system.

[0066] See also Figure 3 and Figure 4 The air conditioner further includes a pressure sensor 8, which can be located in the connecting pipe between the four-way valve 2 and the capillary network 3, or in the pipe at the suction port of the compressor 1. The pressure sensor 8 is used to detect the low pressure of the radiant cooling system.

[0067] See also Figure 3 The air conditioner further includes a wet-bulb temperature sensor 9. The wet-bulb temperature sensor 9 is used to detect the indoor wet-bulb temperature.

[0068] The air conditioner provided in the embodiment of the present invention further includes a controller 10. Figure 5 The controller 10 is connected to the pressure sensor 8 to receive the low pressure of the radiant cooling system detected by the pressure sensor 8; the controller 10 is also connected to the wet-bulb temperature sensor 9 to receive the indoor wet-bulb temperature detected by the wet-bulb temperature sensor 9; the controller 10 is also connected to the compressor 1 to control the frequency adjustment of the compressor 1. The controller 10 is specifically used to:

[0069] When the compressor 1 is turned on for a preset time, obtaining the wet-bulb temperature;

[0070] When it is detected that the wet-bulb temperature is lower than a preset wet-bulb temperature safety value, obtaining the saturation temperature corresponding to the low pressure;

[0071] If it is detected that the saturation temperature is lower than the preset temperature lower limit, the compressor 1 is controlled to reduce the frequency;

[0072] If it is detected that the saturation temperature is greater than the preset temperature upper limit, the compressor 1 is controlled to increase the frequency.

[0073] In the air conditioner provided by an embodiment of the present invention, when the controller 10 detects that the indoor wet-bulb temperature is less than a preset wet-bulb temperature safety value, it determines the lowest evaporation temperature based on the saturation temperature corresponding to the low pressure of the radiant cooling system. This controls the compressor 1 to reduce the frequency when the saturation temperature is less than the preset lower limit, and to reduce the frequency when the saturation temperature is less than the preset lower limit. Consequently, the cooling capacity can be reduced when the saturation temperature is low, and the evaporation temperature at the capillary network 3 is controlled above the dew point, thereby preventing condensation at the lowest temperature point in the capillary network and ensuring normal operation of the air conditioner. Simultaneously, the cooling capacity of the compressor 1 can be increased when the saturation temperature is high, thereby ensuring cooling efficiency and shortening the dry-bulb temperature drop time.

[0074] Specifically, the preset time is 10 minutes. It is understood that when the compressor 1 of the radiant cooling system starts to operate, the dry-bulb temperature / the evaporation temperature of the capillary network 3 has not yet begun to decrease or stabilize, so the compressor 1 should be controlled according to the wet-bulb temperature / the saturation temperature corresponding to the low pressure after the compressor 1 has been running for the preset time.

[0075] It should be noted that the low pressure is the evaporation pressure in the evaporator and is also the suction pressure of the compressor 1. Since the capillary tube network 3 typically has a length of more than ten meters, the evaporation temperature along the capillary tube network 3 varies greatly. Even if thermocouples are laid out on the capillary tube network 3, the actual evaporation temperature measured is often higher than the evaporation temperature at the lowest point of the capillary tube network 3 due to the limited number of thermocouples. Furthermore, the lowest evaporation temperature of the capillary tube network 3 varies with frequency, operating conditions, and operating conditions at each location along the pipe, making it impossible to determine the lowest evaporation temperature of the capillary tube network 3. For radiant cooling air conditioners, the capillary tube network 3 is typically laid on the roof, wall, or floor. Once the evaporation temperature of the capillary tube network 3 is lower than the indoor wet-bulb temperature, condensation and dripping will form around the capillary tube network 3. Over time, this will damage the user's interior decoration, rendering the air conditioner inoperable. Consequently, radiant cooling technology has been unable to be widely applied. In this embodiment, the low pressure of the radiant cooling system is detected by the pressure sensor 8, and the corresponding saturation temperature is obtained from the low pressure, so that the evaporation temperature of the lowest evaporation point of the capillary network 3 can be indirectly obtained, thereby effectively controlling the evaporation temperature of the lowest evaporation point of the capillary network 3 to be higher than the dew point temperature / wet-bulb temperature to prevent condensation, making the practical engineering application of the radiant cooling technology possible, and better leveraging the advantages of the radiant cooling technology in terms of high efficiency, energy saving, quietness and comfort.

[0076] Specifically, the preset temperature lower limit is calculated by subtracting the preset temperature safety difference from the wet-bulb temperature safety value and then subtracting the preset fluctuation value, i.e., the preset temperature lower limit = wet-bulb temperature safety value - preset temperature safety difference - preset fluctuation value. The preset temperature upper limit is calculated by subtracting the preset temperature safety difference from the wet-bulb temperature safety value and then adding the preset fluctuation value, i.e., the preset temperature upper limit = wet-bulb temperature safety value - preset temperature safety difference + preset fluctuation value. The preset temperature safety difference is the temperature safety difference between the wet-bulb temperature safety value and the evaporation temperature of the capillary network 3, and the range of the preset temperature safety difference is 8-10°C. The preset fluctuation value is the saturation temperature corresponding to a low-pressure deviation of 0.05 MPa.

[0077] See also Figure 6Furthermore, the air conditioner further includes a dehumidifier 11; wherein the dehumidifier 11 is used to reduce the indoor humidity. The controller 10 is connected to the dehumidifier 11 to control the start and stop of the dehumidifier 11. Then, the controller 10 is also used to:

[0078] When it is detected that the wet-bulb temperature is greater than or equal to the preset wet-bulb temperature safety value, the compressor 1 is controlled to stop running, and the dehumidification device 11 is controlled to start, until it is detected that the wet-bulb temperature is less than the preset wet-bulb temperature safety value, and the dehumidification device 11 is controlled to stop running.

[0079] In the air conditioner provided in this embodiment, since the controller 10 controls the compressor 1 to stop running and controls the dehumidification device 11 to start when detecting that the wet-bulb temperature is greater than or equal to the preset wet-bulb temperature safety value, it is possible to dehumidify the room when the indoor wet-bulb temperature is too high to reduce the indoor humidity and prevent the indoor wet-bulb temperature from being higher than the temperature of the wall, etc., of the built-in radiant cooling system, causing condensation on the wall, etc., and damaging the wall, etc.

[0080] Specifically, the preset wet-bulb temperature safety value is 18°C. It should be noted that, in air conditioners employing a radiant cooling system, the capillary network 3 is installed within the walls of a building. The temperature of the walls on which the capillary network 3 is installed is typically around 20°C. If the indoor wet-bulb temperature is too high, the corresponding humidity in the air is high, and the dew point temperature is relatively low, which can easily cause the wall temperature to fall below the dew point temperature, thereby generating condensation on the walls on which the capillary network 3 is installed. Therefore, once it is detected that the indoor wet-bulb temperature is higher than the preset wet-bulb temperature safety value, the compressor 1 should be stopped to prevent the wall on which the capillary network 3 is installed from becoming too cold and generating condensation. The dehumidifier 11 should also be turned on to dehumidify the room, thereby reducing the indoor humidity and further preventing condensation.

[0081] For example, in combination Figure 7As shown, it is a workflow diagram of the first controller provided by an embodiment of the present invention for anti-condensation control. The anti-condensation control process of the controller 10 is as follows: determine whether the compressor 1 of the radiant refrigeration system is turned on for a preset time (step S11), if so, execute step S12, if otherwise, continue to monitor the on-time of the compressor 1; obtain the indoor wet-bulb temperature (step S12), and then execute step S13; determine whether the wet-bulb temperature is less than the preset wet-bulb temperature safety value (step S13), if so, execute step S14, if otherwise, execute step S15; obtain the saturation temperature corresponding to the low pressure (step S14), and then execute step S141; determine whether the saturation temperature is less than the preset temperature lower limit (step S141), if so, execute step S142, if otherwise, execute step S143; control the compressor Machine 1 reduces the frequency (step S142), and then continues to monitor the saturation temperature corresponding to the low pressure; determines whether the saturation temperature is greater than the preset temperature upper limit (step S143), if so, executes step S144, if not, executes step S145; controls compressor 1 to increase the frequency (step S144), and then continues to monitor the saturation temperature corresponding to the low pressure; controls compressor 1 to increase the frequency (step S145), and then continues to monitor the saturation temperature corresponding to the low pressure; controls compressor 1 to stop running, and controls dehumidification device 11 to start (step S15), and then executes step S151; determines whether the wet-bulb temperature is less than the preset wet-bulb temperature safety value (step S151), if so, executes step S152, if otherwise, returns to S15; controls dehumidification device 11 to stop running (step S152).

[0082] As one of the specific embodiments, if it is detected that the saturation temperature is lower than the preset temperature lower limit, the compressor 1 is controlled to reduce the frequency, specifically:

[0083] If it is detected that the saturation temperature is lower than the preset temperature lower limit, the frequency of the compressor 1 is decreased according to the first time period during which the saturation temperature is lower than the preset temperature lower limit and the first preset frequency adjustment amount to control the compressor 1 to reduce the frequency.

[0084] In the air conditioner provided in this embodiment, since the controller 10 decreases the frequency of the compressor 1 according to the first time period during which the saturation temperature is less than the preset temperature lower limit and the first preset frequency adjustment amount when detecting that the saturation temperature is less than the preset temperature lower limit, so as to control the compressor 1 to reduce the frequency, the frequency of the compressor 1 can be gradually reduced to an appropriate frequency to control the evaporation temperature of the capillary network 3 within a suitable range, thereby avoiding condensation of the air conditioner at the lowest temperature of the capillary network 3, and ensuring the normal operation of the air conditioner.

[0085] Furthermore, the first preset frequency adjustment amount is 1 Hz.

[0086] For example, taking the first preset frequency adjustment amount as 1 Hz, when it is detected that the saturation temperature is lower than the preset temperature lower limit, the frequency of the compressor 1 is controlled to reduce by 1 Hz per second: if the frequency of the compressor 1 at time t is F, then after the saturation temperature is lower than the preset temperature lower limit for 5 seconds, the frequency of the compressor 1 drops to F-5.

[0087] As one of the specific embodiments, if it is detected that the saturation temperature is greater than the preset temperature upper limit, the compressor 1 is controlled to increase the frequency, specifically:

[0088] If it is detected that the saturation temperature is greater than the preset temperature upper limit, the frequency of the compressor 1 is increased according to the second time period during which the saturation temperature is greater than the temperature upper limit and the second preset frequency adjustment amount to control the compressor 1 to increase the frequency.

[0089] In the air conditioner provided in this embodiment, since the controller 10 increases the frequency of the compressor 1 according to the second time period during which the saturation temperature is greater than the temperature upper limit and the second preset frequency adjustment amount when detecting that the saturation temperature is greater than the temperature upper limit, so as to control the compressor 1 to increase the frequency, the frequency of the compressor 1 can be increased to an appropriate frequency to ensure the cooling effect and shorten the falling time of the dry-bulb temperature, thereby avoiding the dry-bulb temperature from failing to fall to the set temperature for a long time due to insufficient cooling capacity.

[0090] Specifically, the second preset frequency adjustment amount is 1 Hz.

[0091] For example, taking the second preset frequency adjustment amount as 1 Hz, when it is detected that the saturation temperature is greater than the preset temperature upper limit, the compressor 1 is controlled to increase by 1 Hz every 10 seconds. If the frequency of the compressor 1 at time t is F, then when the saturation temperature is greater than the preset temperature upper limit for 10 seconds, the frequency of the compressor 1 is increased to F+1.

[0092] See also Figure 8 Furthermore, the air conditioner further includes a dry bulb temperature sensor 12; wherein the dry bulb temperature sensor 12 is used to detect the dry bulb temperature in the room. The controller 10 is connected to the dry bulb temperature sensor 12 to receive the dry bulb temperature detected by the dry bulb temperature sensor 12. Then, the controller 10 is further used to:

[0093] obtaining the dry-bulb temperature, and controlling the compressor 1 to turn on when the dry-bulb temperature is greater than the target temperature;

[0094] If it is detected that the dry-bulb temperature drops to the lower limit of the temperature corresponding to the target temperature, the compressor 1 is controlled to stop running.

[0095] In the air conditioner provided in this embodiment, the controller 10 controls the compressor 1 to start when the dry-bulb temperature is greater than the target temperature, and controls the compressor 1 to stop when the dry-bulb temperature drops to the lower limit of the temperature corresponding to the target temperature. Therefore, the dry-bulb temperature can be maintained between the target temperature and the corresponding lower limit, ensuring the cooling effect of the air conditioner.

[0096] For example, in combination Figure 9 As shown, it is a workflow diagram of the second controller provided by an embodiment of the present invention for anti-condensation control. The anti-condensation control process of the controller 10 is as follows: obtain the indoor dry-bulb temperature (step S1a), and then execute step S1b; determine whether the dry-bulb temperature is greater than the target temperature (step S1b), if so, execute step S1c, if not, execute step S1d; control the compressor 1 to start (step S1c), and then execute step S11; control the compressor 1 to stop running (step S1d), and then continue to monitor the dry-bulb temperature; determine whether the compressor 1 of the radiant refrigeration system is turned on for a preset time (step S11), if so, execute step S12, if not, continue to monitor the on-time of the compressor 1; obtain the indoor wet-bulb temperature (step S12), and then execute step S13; determine whether the wet-bulb temperature is less than the preset wet-bulb temperature safety value (step S13), if so, execute step S14, if not, execute step S15 to obtain the saturation temperature corresponding to the low pressure (step S14), and then Execute step S141; determine whether the saturation temperature is less than the preset temperature lower limit (step S141), if so, execute step S142, if not, execute step S143; control the compressor 1 to reduce the frequency (step S142), and then continue to monitor the saturation temperature corresponding to the low pressure; determine whether the saturation temperature is greater than the preset temperature upper limit (step S143), if so, execute step S144, if not, execute step S145; control the compressor 1 to increase the frequency (step S144), and then continue to monitor the saturation temperature corresponding to the low pressure; control the compressor 1 to increase the frequency (step S145), and then continue to monitor the saturation temperature corresponding to the low pressure; control the compressor to stop running, and control the dehumidification device 11 to start (step S15), and then execute step S151; determine whether the wet-bulb temperature is less than the preset wet-bulb temperature safety value (step S151), if so, execute step S152, if otherwise, return to S15; control the dehumidification device 11 to stop running (step S152).

[0097] Specifically, the controller 10 is further configured to:

[0098] If it is detected that the saturation temperature is less than or equal to the preset temperature upper limit value, and the saturation temperature is greater than or equal to the preset temperature lower limit value, the compressor 1 is controlled to maintain the current frequency.

[0099] In the air conditioner provided in this embodiment, since the controller 10 controls the compressor 1 to maintain the current frequency unchanged when detecting that the saturation temperature is within the preset temperature upper limit value and the preset temperature lower limit value, it is possible to avoid the impact of detection errors and slight temperature fluctuations on the anti-condensation control of the radiant refrigeration system.

[0100] See also Figure 10 , is a flow chart of an anti-condensation control method for an air conditioner provided by an embodiment of the present invention.

[0101] This embodiment provides an anti-condensation control method for an air conditioner, wherein the air conditioner includes a radiant cooling system, a pressure sensor, and a wet-bulb temperature sensor; wherein the radiant cooling system is composed of a compressor, a four-way valve, a capillary network, a throttling device, and an outdoor heat exchanger; the pressure sensor is provided on the connecting pipe between the four-way valve and the capillary network, or on the pipe at the suction port of the compressor, and is used to detect the low pressure of the radiant cooling system; the wet-bulb temperature sensor is used to detect the indoor wet-bulb temperature; then, the method comprises the following steps:

[0102] S1. When the compressor is turned on for a preset time, obtain the indoor wet-bulb temperature;

[0103] S2. When it is detected that the wet-bulb temperature is lower than a preset wet-bulb temperature safety value, obtaining a saturation temperature corresponding to a low pressure of the radiant cooling system;

[0104] S3. If it is detected that the saturation temperature is lower than the preset temperature lower limit, the compressor is controlled to reduce the frequency;

[0105] S4. If it is detected that the saturation temperature is greater than a preset temperature upper limit, the compressor is controlled to increase the frequency.

[0106] In the air conditioner anti-condensation control method provided in this embodiment, when the indoor wet-bulb temperature is detected to be less than a preset wet-bulb temperature safety value, the lowest evaporation temperature is determined based on the saturation temperature corresponding to the low pressure of the radiant cooling system. This controls the compressor to reduce frequency when the saturation temperature is less than the preset lower limit, and to reduce frequency when the saturation temperature is less than the preset lower limit. Consequently, the cooling capacity can be reduced when the saturation temperature is low, keeping the evaporation temperature at the capillary network above the dew point, thereby preventing condensation at the lowest temperature point in the capillary network and ensuring normal operation of the air conditioner. Simultaneously, the compressor's cooling capacity can be increased when the saturation temperature is high, ensuring cooling efficiency and shortening the dry-bulb temperature drop time.

[0107] As one specific embodiment, the air conditioner further includes a dehumidification device; wherein the dehumidification device is used to reduce indoor humidity; then, the method further includes:

[0108] When it is detected that the wet-bulb temperature is greater than or equal to the preset wet-bulb temperature safety value, the compressor is controlled to stop running, and the dehumidification device is controlled to start until it is detected that the wet-bulb temperature is less than the preset wet-bulb temperature safety value, and the dehumidification device is controlled to stop running.

[0109] In the anti-condensation control method for the air conditioner provided in this embodiment, since the compressor is controlled to stop running and the dehumidification device is controlled to start when it is detected that the wet-bulb temperature is greater than or equal to the preset wet-bulb temperature safety value, the indoor dehumidification can be performed when the indoor wet-bulb temperature is too high to reduce the indoor humidity and avoid the indoor wet-bulb temperature being higher than the temperature of the wall, etc. of the built-in radiant cooling system, causing condensation on the wall, etc., and damaging the wall, etc.

[0110] Furthermore, if it is detected that the saturation temperature is lower than a preset temperature lower limit, the compressor is controlled to reduce the frequency, specifically:

[0111] If it is detected that the saturation temperature is lower than the preset temperature lower limit, the frequency of the compressor is decreased according to the first time period during which the saturation temperature is lower than the preset temperature lower limit and the first preset frequency adjustment amount to control the compressor to reduce the frequency.

[0112] In the anti-condensation control method for the air conditioner provided in this embodiment, since when it is detected that the saturation temperature is lower than the preset temperature lower limit value, the frequency of the compressor is gradually reduced according to the first time period during which the saturation temperature is lower than the preset temperature lower limit value and the first preset frequency adjustment amount, so as to control the compressor to reduce the frequency. Therefore, the frequency of the compressor can be gradually reduced to an appropriate frequency to control the evaporation temperature of the capillary network within a suitable range, thereby avoiding condensation of the air conditioner at the lowest temperature of the capillary network, so as to ensure the normal operation of the air conditioner.

[0113] Furthermore, if it is detected that the saturation temperature is greater than a preset temperature upper limit, the compressor is controlled to increase the frequency, specifically:

[0114] If it is detected that the saturation temperature is greater than the preset temperature upper limit, the frequency of the compressor is increased according to the second time period during which the saturation temperature is greater than the temperature upper limit and the second preset frequency adjustment amount to control the compressor to increase the frequency.

[0115] In the anti-condensation control method for the air conditioner provided in this embodiment, since when it is detected that the saturation temperature is greater than the preset temperature upper limit value, the frequency of the compressor is increased incrementally according to the second time period during which the saturation temperature is greater than the temperature upper limit value and the second preset frequency adjustment amount, so as to control the compressor to increase the frequency. Therefore, the frequency of the compressor can be increased to an appropriate frequency to ensure the cooling effect and shorten the falling time of the dry-bulb temperature, thereby avoiding the dry-bulb temperature from failing to fall to the set temperature for a long time due to insufficient cooling capacity.

[0116] In one specific embodiment, the air conditioner further includes a dry-bulb temperature sensor; wherein the dry-bulb temperature sensor is used to detect the indoor dry-bulb temperature; then, the method further includes:

[0117] Obtaining the indoor dry-bulb temperature, and controlling the compressor to turn on when the dry-bulb temperature is greater than a target temperature;

[0118] If it is detected that the dry-bulb temperature drops to a lower limit of the temperature corresponding to the target temperature, the compressor is controlled to stop running.

[0119] In the anti-condensation control method for an air conditioner provided in this embodiment, the compressor is controlled to start when the dry-bulb temperature is detected to be greater than the target temperature, and the compressor is controlled to stop when the dry-bulb temperature is detected to have dropped to the lower limit of the temperature corresponding to the target temperature. Therefore, the dry-bulb temperature can be maintained between the target temperature and the corresponding lower limit, ensuring the cooling effect of the air conditioner.

[0120] Specifically, the method further includes:

[0121] If it is detected that the saturation temperature is less than or equal to the preset temperature upper limit value, and the saturation temperature is greater than or equal to the preset temperature lower limit value, the compressor is controlled to maintain the current frequency.

[0122] In the anti-condensation control method for the air conditioner provided in this embodiment, since the compressor is controlled to maintain the current frequency unchanged when the saturation temperature is detected to be within the preset temperature upper limit value and the preset temperature lower limit value, it is possible to avoid the impact of detection errors and slight temperature fluctuations on the anti-condensation control of the radiant refrigeration system.

[0123] The detailed description of the anti-condensation control method for the air conditioner provided in this embodiment can be referred to the detailed description of each embodiment of the air conditioner described above, and will not be repeated here.

[0124] It should be noted that the device embodiments described above are merely illustrative, wherein 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 across multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment. In addition, in the drawings of the device embodiments provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, which may be specifically implemented as one or more communication buses or signal lines. A person of ordinary skill in the art can understand and implement the present invention without inventive effort.

[0125] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. An air conditioner, characterized in that: include: The radiant cooling system consists of a compressor, a four-way valve, a capillary network, a throttling device and an outdoor heat exchanger; a pressure sensor, which is provided on the connecting pipeline between the four-way valve and the capillary network, or on the pipeline at the suction port of the compressor, and is used to detect the low pressure of the radiant refrigeration system; Wet-bulb temperature sensor, used to detect indoor wet-bulb temperature; Controller for: When the compressor is turned on for a preset time, obtaining the wet-bulb temperature; When it is detected that the wet-bulb temperature is lower than a preset wet-bulb temperature safety value, obtaining the saturation temperature corresponding to the low pressure; If it is detected that the saturation temperature is lower than the preset temperature lower limit, controlling the compressor to reduce the frequency; If it is detected that the saturation temperature is greater than a preset temperature upper limit, the compressor is controlled to increase the frequency.

2. The air conditioner according to claim 1, wherein The air conditioner also includes a dehumidification device; wherein, The dehumidification device is used to reduce indoor humidity; Then, the controller is further configured to: When it is detected that the wet-bulb temperature is greater than or equal to the preset wet-bulb temperature safety value, the compressor is controlled to stop running, and the dehumidification device is controlled to start, until it is detected that the wet-bulb temperature is less than the preset wet-bulb temperature safety value, and the dehumidification device is controlled to stop running.

3. The air conditioner according to claim 1, wherein If it is detected that the saturation temperature is lower than the preset temperature lower limit, the compressor is controlled to reduce the frequency, specifically: If it is detected that the saturation temperature is lower than the preset temperature lower limit, the frequency of the compressor is decreased according to the first time period during which the saturation temperature is lower than the preset temperature lower limit and the first preset frequency adjustment amount to control the compressor to reduce the frequency.

4. The air conditioner according to claim 1, wherein If it is detected that the saturation temperature is greater than the preset temperature upper limit, the compressor is controlled to increase the frequency, specifically: If it is detected that the saturation temperature is greater than the preset temperature upper limit, the frequency of the compressor is increased according to the second time period during which the saturation temperature is greater than the temperature upper limit and the second preset frequency adjustment amount to control the compressor to increase the frequency.

5. The air conditioner according to claim 1, wherein The air conditioner further includes a dry-bulb temperature sensor; wherein, The dry-bulb temperature sensor is used to detect the indoor dry-bulb temperature; Then, the controller is further configured to: obtaining the dry-bulb temperature, and controlling the compressor to turn on when the dry-bulb temperature is greater than a target temperature; If it is detected that the dry-bulb temperature drops to a lower limit of the temperature corresponding to the target temperature, the compressor is controlled to stop running.

6. The air conditioner according to claim 1, wherein: The controller is also used to: If it is detected that the saturation temperature is less than or equal to the preset temperature upper limit value, and the saturation temperature is greater than or equal to the preset temperature lower limit value, the compressor is controlled to maintain the current frequency.

7. An anti-condensation control method for an air conditioner, characterized in that: The air conditioner includes a radiant cooling system, a pressure sensor, and a wet-bulb temperature sensor; wherein the radiant cooling system is composed of a compressor, a four-way valve, a capillary network, a throttling device, and an outdoor heat exchanger; the pressure sensor is provided on a connecting pipe between the four-way valve and the capillary network, or on a pipe at a suction port of the compressor, and is used to detect the low pressure of the radiant cooling system; the wet-bulb temperature sensor is used to detect the indoor wet-bulb temperature; then, the method comprises: When the compressor is turned on for a preset time, the indoor wet-bulb temperature is obtained; When it is detected that the wet-bulb temperature is less than a preset wet-bulb temperature safety value, obtaining a saturation temperature corresponding to a low pressure of the radiant cooling system; If it is detected that the saturation temperature is lower than the preset temperature lower limit, the compressor is controlled to reduce the frequency; If it is detected that the saturation temperature is greater than a preset temperature upper limit, the compressor is controlled to increase the frequency.

8. The anti-condensation control method for an air conditioner according to claim 7, wherein: The air conditioner further includes a dehumidification device; wherein the dehumidification device is used to reduce indoor humidity; then, the method further includes: When it is detected that the wet-bulb temperature is greater than or equal to the preset wet-bulb temperature safety value, the compressor is controlled to stop running, and the dehumidification device is controlled to start until it is detected that the wet-bulb temperature is less than the preset wet-bulb temperature safety value, and the dehumidification device is controlled to stop running.

9. The anti-condensation control method for an air conditioner according to claim 7, wherein: If it is detected that the saturation temperature is lower than the preset temperature lower limit, the compressor is controlled to reduce the frequency, specifically: If it is detected that the saturation temperature is lower than the preset temperature lower limit, the frequency of the compressor is decreased according to the first time period during which the saturation temperature is lower than the preset temperature lower limit and the first preset frequency adjustment amount to control the compressor to reduce the frequency.

10. The anti-condensation control method for an air conditioner according to claim 7, wherein: If it is detected that the saturation temperature is greater than the preset temperature upper limit, the compressor is controlled to increase the frequency, specifically: If it is detected that the saturation temperature is greater than the preset temperature upper limit, the frequency of the compressor is increased according to the second time period during which the saturation temperature is greater than the temperature upper limit and the second preset frequency adjustment amount to control the compressor to increase the frequency.

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