Method for dry-wet separation operation of terminal air conditioner and multi-split air conditioning system

Abstract

The application discloses a method for dry-wet separation operation of terminal air conditioners and a multi-air-conditioning system, which is used for dividing the terminal air conditioners into dry air conditioners and wet air conditioners, controlling the dry air conditioners which are sensitive to water leakage to carry out refrigeration, and controlling the wet air conditioners which are not sensitive to water leakage to carry out dehumidification, so that the influence of air conditioner water leakage on the safety of a data machine room is effectively reduced. The method comprises the following steps: dividing the terminal air conditioners in a multi-air-conditioning system of a data machine room into dry air conditioners and wet air conditioners, wherein the sensitive degree of the installation position of the dry air conditioners to water leakage is higher than the sensitive degree of the installation position of the wet air conditioners to water leakage; controlling the target evaporation temperature of the dry air conditioners to be higher than the air dew point temperature, so that the dry air conditioners are in a refrigeration mode without condensate water; and controlling the target evaporation temperature of the wet air conditioners to be not higher than the air dew point temperature, so that the wet air conditioners are in a dehumidification mode.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioning systems, in particular to a method for dry and wet separation operation of terminal air conditioners and a multi-split air conditioning system. BACKGROUND

[0002] A multi-split air conditioning system is composed of one outdoor unit and several terminal air conditioners (indoor units) and has been widely used in the field of comfort for the public. A multi-split air conditioning system for the public supplies cooling to different rooms by one set of multi-split air conditioning system, and each room can have multiple terminal air conditioners. The terminal air conditioners are usually not used at the same time, while all the terminal air conditioners of a multi-split air conditioning system applied to a data center are arranged in the same area and are usually used at the same time. A data center or the same area can contain multiple sets of multi-split air conditioning systems.

[0003] At present, a multi-split air conditioning system applied to a data center needs to control not only the temperature but also the humidity of the data center. Since the data center is very sensitive to air conditioning water leakage, how to ensure refrigeration and dehumidification while avoiding affecting the safety of the data center has become a technical problem to be solved. SUMMARY

[0004] The present application provides a method for dry and wet separation operation of terminal air conditioners and a multi-split air conditioning system, which is used to divide the terminal air conditioners into dry air conditioners and wet air conditioners, control the dry air conditioners which are sensitive to water leakage to perform refrigeration, and control the wet air conditioners which are not sensitive to water leakage to perform dehumidification, thereby effectively reducing the influence of air conditioning water leakage on the safety of the data center.

[0005] In a first aspect, the present application provides a method for dry and wet separation operation of terminal air conditioners, which comprises:

[0006] Dividing the terminal air conditioners in a multi-split air conditioning system of a data center into dry air conditioners and wet air conditioners, wherein the installation position of the dry air conditioners is more sensitive to water leakage than the installation position of the wet air conditioners;

[0007] Controlling the target evaporation temperature of the dry air conditioners to be higher than the air dew point temperature, so that the dry air conditioners are in a refrigeration mode without condensate water;

[0008] Controlling the target evaporation temperature of the wet air conditioners to be not higher than the air dew point temperature, so that the wet air conditioners are in a dehumidification mode.

[0009] The method for dry-wet separation operation of the terminal air conditioner provided by the embodiment of the application divides the terminal air conditioner into a dry-wet air conditioner which is sensitive to water leakage and a wet air conditioner which is not sensitive to water leakage according to the sensitivity of the installation position to water leakage, and controls the dry air conditioner to operate in a refrigeration mode without generating condensate water, so as to avoid the adverse effects of water leakage on the safety of the equipment in the data center, and controls the wet air conditioner to operate in a dehumidification mode, so as to ensure the humidity requirement of the data center, and at the same time, since the position of the wet air conditioner is less sensitive to water leakage, the influence of water leakage on the data center can be reduced to the greatest extent. In addition, the one-to-many air conditioning system in the embodiment utilizes different modes of the terminal air conditioner to solve the influence of water leakage on the data center, and does not need to additionally install a dehumidifier or a dehumidification air conditioner, thereby saving the space of the data center and saving the electric energy due to the energy consumption of the dehumidifier or the dehumidification air conditioner.

[0010] As an optional implementation, the target evaporation temperature of the dry air conditioner is higher than the air dew point temperature, including:

[0011] The target evaporation temperature of the dry air conditioner is higher than the air dew point temperature by adjusting the opening of the pressure control valve of the dry air conditioner.

[0012] As an optional implementation, the target evaporation temperature of the wet air conditioner is not higher than the air dew point temperature, including:

[0013] If it is determined that the air dew point temperature detected by any one of the terminal air conditioners is greater than the preset dew point temperature, the target evaporation temperature of the wet air conditioner is controlled to be not higher than the air dew point temperature; or,

[0014] If it is determined that the humidity of the data center exceeds the humidity threshold value, the target evaporation temperature of the wet air conditioner is controlled to be not higher than the air dew point temperature.

[0015] As an optional implementation, the target evaporation temperature of the wet air conditioner is not higher than the air dew point temperature, including:

[0016] The target evaporation temperature of the wet air conditioner without the pressure control valve is determined to be not higher than the air dew point temperature; or,

[0017] The target evaporation temperature of the wet air conditioner is determined to be not higher than the air dew point temperature by adjusting the pressure control valve of the wet air conditioner to the maximum opening.

[0018] As an optional implementation, the method further includes:

[0019] The opening of the electronic expansion valve of the dry air conditioner is controlled to adjust the refrigerant flow of the dry air conditioner in the refrigeration mode; and / or,

[0020] controlling the opening degree of the electronic expansion valve of the wet-type air conditioner to make the wet-type air conditioner enter the cooling mode and adjust the refrigerant flow in the cooling mode.

[0021] As an optional implementation, the method of controlling the opening degree of the electronic expansion valve of the dry-type air conditioner comprises:

[0022] controlling the opening degree of the electronic expansion valve of the dry-type air conditioner according to the size relationship between a first superheat degree of the dry-type air conditioner and a preset target superheat degree, wherein the first superheat degree is determined according to the pressure value and the temperature value detected by the dry-type air conditioner;

[0023] The method of controlling the opening degree of the electronic expansion valve of the wet-type air conditioner comprises:

[0024] controlling the opening degree of the electronic expansion valve of the wet-type air conditioner according to the size relationship between a second superheat degree of the wet-type air conditioner and a preset target superheat degree, wherein the second superheat degree is determined according to the pressure value and the temperature value detected by the wet-type air conditioner.

[0025] As an optional implementation, the method further comprises:

[0026] determining the total cooling capacity of the terminal air conditioners according to the cooling capacity of each terminal air conditioner;

[0027] determining the refrigeration demand of the compressor in the multi-split air conditioning system according to the first rated cooling capacity of the compressor and the total cooling capacity;

[0028] starting the compressor to perform refrigeration according to the refrigeration demand.

[0029] As an optional implementation, the cooling capacity of each terminal air conditioner is determined by:

[0030] for any one terminal air conditioner, determining the refrigeration demand of the terminal air conditioner according to the detected temperature value, the set target temperature and the set accuracy, and determining the cooling capacity of the terminal air conditioner according to the refrigeration demand and the second rated cooling capacity of the terminal air conditioner.

[0031] As an optional implementation, the cooling capacity of each terminal air conditioner is determined by:

[0032] for any one dry-type air conditioner, determining the theoretical supply air temperature of the dry-type air conditioner according to the temperature value detected by the dry-type air conditioner and the target evaporating temperature obtained, and determining the cooling capacity of the dry-type air conditioner according to the theoretical supply air temperature, the temperature value and the target evaporating temperature;

[0033] For any one wet air conditioner, according to the temperature value detected by the wet air conditioner, the set target temperature and the set accuracy, the refrigeration demand is determined, and according to the refrigeration demand and the third rated refrigeration capacity of the wet air conditioner, the refrigeration capacity of the wet air conditioner is determined.

[0034] As an optional implementation, the method further comprises:

[0035] If it is determined that the evaporator of the dry air conditioner has condensate water, an alarm is given and the operation is stopped; or,

[0036] If it is determined that the evaporator of the dry air conditioner has condensate water, the target evaporation temperature of the dry air conditioner is increased.

[0037] In a second aspect, the embodiments of the present application provide a multi-split air conditioning system, which comprises an outdoor unit, end air conditioners and a controller; wherein the end air conditioners comprise dry air conditioners and wet air conditioners, and the installation position of the dry air conditioner is more sensitive to water leakage than the installation position of the wet air conditioner.

[0038] The controller is specifically configured to perform:

[0039] The target evaporation temperature of the dry air conditioner is controlled to be higher than the air dew point temperature, so that the dry air conditioner is in a refrigeration mode without condensate water;

[0040] The target evaporation temperature of the wet air conditioner is controlled to be not higher than the air dew point temperature, so that the wet air conditioner enters a dehumidification mode.

[0041] As an optional implementation, the controller is specifically configured to perform:

[0042] The target evaporation temperature of the dry air conditioner is controlled to be higher than the air dew point temperature by adjusting the opening degree of the pressure control valve of the dry air conditioner.

[0043] As an optional implementation, the controller is specifically configured to perform:

[0044] If it is determined that the air dew point temperature detected by any one end air conditioner is greater than a preset dew point temperature, the target evaporation temperature of the wet air conditioner is controlled to be not higher than the air dew point temperature; or,

[0045] If it is determined that the humidity of the data center exceeds a humidity threshold, the target evaporation temperature of the wet air conditioner is controlled to be not higher than the air dew point temperature.

[0046] As an optional implementation, the controller is specifically configured to perform:

[0047] determining that a target evaporating temperature of the wet-type air conditioner is not higher than an air dew point temperature, when a pressure control valve is not installed in the wet-type air conditioner; or

[0048] determining that a target evaporating temperature of the wet-type air conditioner is not higher than an air dew point temperature, by adjusting the pressure control valve of the wet-type air conditioner to be at a maximum opening degree.

[0049] As an optional implementation, the controller is specifically further configured to perform:

[0050] controlling an opening degree of the electronic expansion valve of the dry-type air conditioner, so that the dry-type air conditioner adjusts refrigerant flow in a cooling mode; and / or,

[0051] controlling an opening degree of the electronic expansion valve of the wet-type air conditioner, so that the wet-type air conditioner enters a cooling mode and adjusts refrigerant flow in the cooling mode.

[0052] As an optional implementation, the controller is specifically configured to perform:

[0053] controlling an opening degree of the electronic expansion valve of the dry-type air conditioner according to a size relationship between a first superheat degree of the dry-type air conditioner and a preset target superheat degree, wherein the first superheat degree is determined according to a pressure value and a temperature value detected by the dry-type air conditioner;

[0054] the controlling an opening degree of the electronic expansion valve of the wet-type air conditioner comprises:

[0055] controlling an opening degree of the electronic expansion valve of the wet-type air conditioner according to a size relationship between a second superheat degree of the wet-type air conditioner and a preset target superheat degree, wherein the second superheat degree is determined according to a pressure value and a temperature value detected by the wet-type air conditioner.

[0056] As an optional implementation, the controller is specifically further configured to perform:

[0057] determining a total refrigerating capacity of the terminal air conditioners according to the refrigerating capacity of each terminal air conditioner;

[0058] determining a refrigeration demand of the compressor in the multi-split air conditioning system according to a first rated refrigerating capacity of the compressor in the multi-split air conditioning system and the total refrigerating capacity;

[0059] starting the compressor to perform refrigeration according to the refrigeration demand.

[0060] As an optional implementation, the controller is specifically configured to determine the refrigerating capacity of each terminal air conditioner by:

[0061] For any one terminal air conditioner, according to the detected temperature value, the set target temperature and the set accuracy, the refrigeration demand of the terminal air conditioner is determined, and according to the refrigeration demand and the second rated refrigeration capacity of the terminal air conditioner, the refrigeration capacity of the terminal air conditioner is determined.

[0062] As an optional implementation, the controller is specifically configured to determine the refrigeration capacity of each terminal air conditioner by:

[0063] For any one dry air conditioner, according to the temperature value detected by the dry air conditioner, the target evaporation temperature obtained, the theoretical supply air temperature of the dry air conditioner is determined, and according to the theoretical supply air temperature, the temperature value and the target evaporation temperature, the refrigeration capacity of the dry air conditioner is determined.

[0064] For any one wet air conditioner, according to the temperature value detected by the wet air conditioner, the set target temperature and the set accuracy, the refrigeration demand is determined, and according to the refrigeration demand and the third rated refrigeration capacity of the wet air conditioner, the refrigeration capacity of the wet air conditioner is determined.

[0065] As an optional implementation, the controller is specifically further configured to perform:

[0066] If it is determined that the evaporator of the dry air conditioner has condensate water, an alarm is given and the operation is stopped; or,

[0067] If it is determined that the evaporator of the dry air conditioner has condensate water, the target evaporation temperature of the dry air conditioner is increased. BRIEF DESCRIPTION OF DRAWINGS

[0068] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative labor.

[0069] Figure 1 A method implementation flowchart for the dry-wet separation operation of the terminal air conditioner provided by the embodiment of the present application;

[0070] Figure 2 A position schematic diagram of the dry air conditioner provided by the embodiment of the present application;

[0071] Figure 3 A detailed schematic diagram of the one-to-many air conditioning system provided by the embodiment of the present application;

[0072] Figure 4 A refrigeration process implementation flowchart of the dry air conditioner provided by the embodiment of the present application;

[0073] Figure 5 A flow chart of a dehumidification process of a wet air conditioner is provided for the embodiment of the present application.

[0074] Figure 6 A schematic diagram of a multi-split air conditioning system is provided for the embodiment of the present application.

[0075] Figure 7 A schematic diagram of a device for dry and wet separation operation of an end air conditioner is provided for the embodiment of the present application.

[0076] Figure 8 A schematic diagram of a device for dry and wet separation operation of an end air conditioner is provided for the embodiment of the present application. DETAILED DESCRIPTION

[0077] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0078] In the embodiments of the present application, the term "and / or" describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that there are three cases of A alone, A and B together, and B alone. The character " / " generally represents an "or" relationship between the associated objects before and after it.

[0079] The application scenarios described in the embodiments of the present application are used to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. Those of ordinary skill in the art can know that, with the appearance of new application scenarios, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems. In the description of the present application, unless otherwise specified, the meaning of "multiple" is two or more.

[0080] The multi-split air conditioner is an air conditioning system composed of one outdoor unit and several indoor units, which has been widely used in the field of comfort. The multi-split air conditioning system in the civil field supplies cooling to different rooms, and each room can have multiple indoor units. The indoor units are usually not used at the same time, while all the indoor units of the multi-split air conditioning system applied in the data center are arranged in the same area and are usually used at the same time. A data center or the same area can contain multiple multi-split air conditioning systems. At present, the multi-split air conditioning system applied in the data center not only needs to control the temperature of the data center, but also needs to control the humidity of the data center. Since the data center is very sensitive to air conditioner water leakage, how to ensure refrigeration and dehumidification while avoiding affecting the safety of the data center has become a technical problem to be solved. In addition, in the application scheme of the traditional multi-split air conditioning system in the data center, in order to realize dry coil refrigeration (no condensate water refrigeration), a dehumidifier or an air conditioner with dehumidification capacity must be installed, which not only occupies the space of the data center, but also increases the energy consumption and consumes electric energy.

[0081] In the method for dry and wet separation operation of the indoor unit provided by the embodiment 1, the indoor unit is divided into the dry-type air conditioner sensitive to water leakage and the wet-type air conditioner less sensitive to water leakage according to the sensitivity of the installation position to water leakage, and the dry-type air conditioner is controlled to operate in the refrigeration mode without generating condensate water to avoid the adverse effects of water leakage on the safety of the equipment in the data center. The wet-type air conditioner is controlled to operate in the dehumidification mode to ensure the humidity requirement of the data center. Since the position of the wet-type air conditioner is less sensitive to water leakage, the influence of water leakage on the data center can be minimized. In addition, the multi-split air conditioning system in the embodiment can solve the influence of water leakage on the data center by using different modes of operation of the indoor unit. The embodiment does not need to additionally install a dehumidifier or a dehumidification air conditioner, which saves the space of the data center and does not increase the energy consumption of the dehumidifier or the dehumidification air conditioner, thereby saving electric energy.

[0082] The method for dry-wet separation operation of the terminal air conditioner provided by the embodiment has the core idea that the terminal air conditioner is divided into a dry air conditioner and a wet air conditioner according to the sensitivity of the installation position of the terminal air conditioner in the data center to water leakage. Since the sensitivity of the installation position of the dry air conditioner to water leakage is higher than that of the installation position of the wet air conditioner, the target evaporation temperature of the dry air conditioner is controlled to be higher than the air dew point temperature, so that the dry air conditioner is in a refrigeration mode without condensate water. Since the dry air conditioner is used for refrigeration (i.e., handling the sensible heat load of the data center) and does not produce condensate water, the position of the dry air conditioner can solve the safety hazard caused by water leakage. At the same time, the target evaporation temperature of the wet air conditioner is controlled to be not higher than the air dew point temperature, so that the wet air conditioner is in a dehumidification mode. Since the position of the wet air conditioner is not sensitive to water leakage, the wet air conditioner can be used for dehumidification to ensure the humidity requirement of the data center, and even if water leakage occurs, it will not threaten the safety of the data center. Thus, the influence of water leakage of the VRF air conditioning system on the data center is effectively avoided. Moreover, the embodiment does not need to additionally install a dehumidifier or a dehumidification air conditioner, thereby saving the space of the data center and saving the electric energy without the energy consumption of the dehumidifier or the dehumidification air conditioner.

[0083] As shown in FIG. 1, Figure 1 The method for dry-wet separation operation of the terminal air conditioner provided by the embodiment has the core idea that the terminal air conditioner is divided into a dry air conditioner and a wet air conditioner according to the sensitivity of the installation position of the terminal air conditioner in the data center to water leakage. Since the sensitivity of the installation position of the dry air conditioner to water leakage is higher than that of the installation position of the wet air conditioner, the target evaporation temperature of the dry air conditioner is controlled to be higher than the air dew point temperature, so that the dry air conditioner is in a refrigeration mode without condensate water. Since the dry air conditioner is used for refrigeration (i.e., handling the sensible heat load of the data center) and does not produce condensate water, the position of the dry air conditioner can solve the safety hazard caused by water leakage. At the same time, the target evaporation temperature of the wet air conditioner is controlled to be not higher than the air dew point temperature, so that the wet air conditioner is in a dehumidification mode. Since the position of the wet air conditioner is not sensitive to water leakage, the wet air conditioner can be used for dehumidification to ensure the humidity requirement of the data center, and even if water leakage occurs, it will not threaten the safety of the data center. Thus, the influence of water leakage of the VRF air conditioning system on the data center is effectively avoided. Moreover, the embodiment does not need to additionally install a dehumidifier or a dehumidification air conditioner, thereby saving the space of the data center and saving the electric energy without the energy consumption of the dehumidifier or the dehumidification air conditioner.

[0084] Step 100, dividing the terminal air conditioner in the VRF air conditioning system of a data center into a dry air conditioner and a wet air conditioner, wherein the sensitivity of the installation position of the dry air conditioner to water leakage is higher than the sensitivity of the installation position of the wet air conditioner to water leakage.

[0085] In some embodiments, the division of the terminal air conditioner by the embodiment is based on the sensitivity of the position of the terminal air conditioner in the data center to water leakage. According to the sensitivity of the installation position of the terminal air conditioner in the data center to water leakage, the terminal air conditioner in the VRF air conditioning system is divided into a dry air conditioner and a wet air conditioner. In a specific implementation, a threshold value can be set. If the sensitivity of the position of the terminal air conditioner in the data center to water leakage is higher than the threshold value, the terminal air conditioner is divided into a dry air conditioner. That is, the dry air conditioner is installed at a position in the data center that is more sensitive to water leakage than the threshold value. If the sensitivity of the position of the terminal air conditioner in the data center to water leakage is not higher than the threshold value, the terminal air conditioner is divided into a wet air conditioner. That is, the wet air conditioner is installed at a position in the data center that is less sensitive to water leakage than the threshold value.

[0086] In some embodiments, the dry air conditioner is usually ceiling type, and the installation area does not allow water leakage, and is usually installed above the server cabinet, as shown in the position diagram of the dry air conditioner provided in the embodiment. Figure 2 The wet air conditioner is usually floor type, and the installation area is not sensitive to water leakage, and even if water leakage occurs, it will not affect the safety of the data center. The wet air conditioner can also be ceiling type, but the installation place is not sensitive to water leakage.

[0087] It should be noted that the dry air conditioner and the wet air conditioner divided in the embodiment are only divided according to the operation mode of the terminal air conditioner, wherein the dry air conditioner is used to handle the sensible heat load of the data center, the dry air conditioner does not handle the latent heat load of the data center, and the dry air conditioner does not produce condensate water during refrigeration operation. The wet air conditioner is used to handle the latent heat load of the data center, and the wet air conditioner can also handle the sensible heat load of the data center. The main purpose of the whole VRF air conditioning system during refrigeration is dehumidification, and the humidity of the data center is controlled. If necessary, the sensible heat load of the data center can also be handled.

[0088] Step 101, control the target evaporation temperature of the dry air conditioner to be higher than the air dew point temperature, so that the dry air conditioner is in a refrigeration mode without condensate water;

[0089] Step 102, control the target evaporation temperature of the wet air conditioner to be not higher than the air dew point temperature, so that the wet air conditioner is in a dehumidification mode.

[0090] In specific implementation, by controlling the target evaporation temperature of the dry air conditioner to be higher than the air dew point temperature, the dry air conditioner does not produce condensate water, and thus does not cause water leakage phenomenon to affect the safety of the position sensitive to water leakage. At the same time, the target evaporation temperature of the wet air conditioner is controlled to be not higher than the air dew point temperature, so that the wet air conditioner can play a dehumidification function to ensure the humidity requirement of the data center. Since the wet air conditioner is installed at a position not sensitive to water leakage, even if condensate water is produced, it will not affect the safety of the data center. Thus, by making the terminal air conditioner operate in different modes, the dry air conditioner is used to ensure the refrigeration requirement without producing condensate water to affect the safety of the data center, and the wet air conditioner is used to ensure the dehumidification requirement without affecting the safety of the data center, thereby solving the problem that the VRF air conditioning system is applied to the data center without affecting the safety of the data center.

[0091] In some embodiments, the target evaporation temperature of the dry air conditioner is controlled to be higher than the air dew point temperature by the following method:

[0092] The opening degree of the pressure control valve of the dry air conditioner is adjusted to control the target evaporation temperature of the dry air conditioner to be higher than the air dew point temperature.

[0093] In the embodiment, the opening of the pressure control valve of the dry air conditioner is adjusted in the following manner:

[0094] If it is determined that the pressure detected by the dry air conditioner is greater than the target evaporation pressure, the opening of the pressure control valve is increased so that the pressure detected after the opening is increased is equal to the target evaporation pressure. In the embodiment, if the opening of the pressure control valve is increased, the refrigerant flow can be increased and the pressure can be reduced so that the detected pressure value is reduced until it is equal to the target evaporation pressure.

[0095] If it is determined that the pressure detected by the dry air conditioner is less than the target evaporation pressure, the opening of the pressure control valve is decreased so that the pressure detected after the opening is decreased is equal to the target evaporation pressure. In the embodiment, if the opening of the pressure control valve is decreased, the refrigerant flow can be decreased and the pressure can be increased so that the detected pressure value is increased until it is equal to the target evaporation pressure.

[0096] The target evaporation pressure corresponds to the target evaporation temperature, and the pressure corresponds to the air dew point temperature.

[0097] Optionally, the dry air conditioner in the embodiment can detect the current pressure through a pressure sensor. The target evaporation pressure is determined by the following steps in the embodiment:

[0098] Step 1a, determining the air dew point temperature corresponding to the temperature value detected by the temperature sensor of the dry air conditioner and the humidity value detected by the humidity sensor according to the temperature value and the humidity value.

[0099] The corresponding air dew point temperature can be found in the corresponding relationship table of the air temperature, the air humidity, and the air dew point temperature according to the air temperature being the detected temperature value and the air humidity being the detected humidity value.

[0100] Step 1b, determining the target evaporation temperature of the refrigerant of the dry air conditioner according to the air dew point temperature.

[0101] The target evaporation temperature = the air dew point temperature + a preset temperature value.

[0102] Step 1c, determining the target evaporation pressure corresponding to the target evaporation temperature according to the target evaporation temperature of the refrigerant.

[0103] The corresponding saturation pressure when the saturation temperature is the target evaporation temperature is found according to the corresponding relationship table of the saturation pressure and the saturation temperature of the refrigerant, and the corresponding saturation pressure is determined as the target evaporation pressure corresponding to the target evaporation temperature.

[0104] In some embodiments, the present embodiment can increase the opening of the pressure control valve by a preset unit each time when adjusting the opening of the pressure control valve, or decrease the opening of the pressure control valve by a preset unit each time.

[0105] In some embodiments, the target evaporation temperature of the wet air conditioner is controlled to be not higher than the air dew point temperature in any of the following ways:

[0106] Way 1) If it is determined that the air dew point temperature detected by any of the terminal air conditioners is greater than the preset dew point temperature, the target evaporation temperature of the wet air conditioner is controlled to be not higher than the air dew point temperature.

[0107] Way 2) If it is determined that the humidity of the data center exceeds a humidity threshold, the target evaporation temperature of the wet air conditioner is controlled to be not higher than the air dew point temperature.

[0108] It should be noted that the main purpose of the wet air conditioner is to control the humidity of the data center, so as to maximize the refrigeration capacity of the dry air conditioner. When the humidity is lower, the evaporation temperature is lower, and the refrigeration capacity of the dry air conditioner is greater. Therefore, whether the dehumidification capacity of the wet air conditioner needs to be exerted / improved can be determined from two aspects. On the one hand, a preset dew point temperature for forced dehumidification can be set. As long as the air dew point temperature detected by any of the terminal air conditioners is greater than the preset dew point temperature, the wet air conditioner is controlled to enter the dehumidification mode (i.e., the target evaporation temperature of the wet air conditioner is controlled to be not higher than the air dew point temperature). Alternatively, the dehumidification capacity of the wet air conditioner can be improved by reducing the fan air volume, reducing the evaporation pressure, etc. On the other hand, the humidity of the data center is detected to determine whether the humidity exceeds a humidity threshold. If it does, the target evaporation temperature of the wet air conditioner is controlled to be not higher than the air dew point temperature, and the wet air conditioner enters the dehumidification mode.

[0109] In some embodiments, the target evaporation temperature of the wet air conditioner is controlled to be not higher than the air dew point temperature in any of the following cases:

[0110] Case 1, the wet air conditioner is not installed with a pressure control valve.

[0111] In this case, the wet air conditioner is not installed with a pressure control valve, so that the target evaporation temperature of the wet air conditioner is guaranteed to be not higher than the air dew point temperature, and the wet air conditioner always operates in the dehumidification mode.

[0112] Case 2, the wet air conditioner is installed with a pressure control valve.

[0113] In this case, the pressure control valve of the wet air conditioner is adjusted to the maximum opening degree, and the pressure control valve of the wet air conditioner is in a constant open state, so that the target evaporation temperature of the wet air conditioner is ensured to be not higher than the air dew point temperature, and the wet air conditioner operates in a dehumidification mode.

[0114] In some embodiments, in order to adjust the flow of refrigerant in the refrigeration process, the embodiments can also provide any one of the following ways to adjust the flow of refrigerant:

[0115] Method 1: control the opening degree of the electronic expansion valve of the dry air conditioner; wherein one end of the electronic expansion valve is connected with the dry evaporator of the dry air conditioner, and the other end is connected with the condenser; optionally, the dry air conditioner and the electronic expansion valve are one-to-one corresponding, and one dry air conditioner is connected with one electronic expansion valve.

[0116] In this way, the opening degree of the electronic expansion valve is adjusted, which can directly adjust the flow of refrigerant flowing into the dry evaporator through the electronic expansion valve; if the opening degree of the electronic expansion valve is increased, the flow of refrigerant is increased, and vice versa, if the opening degree of the electronic expansion valve is decreased, the flow of refrigerant is decreased.

[0117] Method 2: control the opening degree of the electronic expansion valve of the wet air conditioner; wherein one end of the electronic expansion valve is connected with the wet evaporator of the wet air conditioner, and the other end is connected with the condenser; optionally, the wet air conditioner and the electronic expansion valve are one-to-one corresponding, and one wet air conditioner is connected with one electronic expansion valve.

[0118] In this way, the opening degree of the electronic expansion valve is adjusted, which can directly adjust the flow of refrigerant flowing into the wet evaporator through the electronic expansion valve; if the opening degree of the electronic expansion valve is increased, the flow of refrigerant is increased, and vice versa, if the opening degree of the electronic expansion valve is decreased, the flow of refrigerant is decreased.

[0119] Method 3: control the opening degree of the electronic expansion valve of the dry air conditioner, and control the opening degree of the electronic expansion valve of the wet air conditioner.

[0120] In this way, the opening degree of the electronic expansion valve of the dry air conditioner is adjusted, which can directly adjust the flow of refrigerant flowing into the dry evaporator through the electronic expansion valve; the opening degree of the electronic expansion valve of the wet air conditioner is adjusted, which can directly adjust the flow of refrigerant flowing into the wet evaporator through the electronic expansion valve. The two adjustment methods can be combined.

[0121] In some embodiments, the opening degree of the electronic expansion valve of the dry air conditioner is controlled by the following method:

[0122] According to the size relationship between a first superheat degree of the dry-type air conditioner and a target superheat degree, the opening degree of the electronic expansion valve of the dry-type air conditioner is controlled, wherein the first superheat degree is determined according to a pressure value and a temperature value detected by the dry-type air conditioner; and the target superheat degree is preset.

[0123] In the implementation, the first superheat degree is determined by the following manner:

[0124] According to the pressure value detected by the pressure sensor of the dry-type air conditioner and a corresponding relationship table of the saturation pressure and the saturation temperature of the refrigerant, the corresponding saturation temperature in the corresponding relationship table when the saturation pressure is the pressure value is searched, and the temperature value obtained by subtracting the saturation temperature from the temperature value detected by the temperature sensor of the dry-type air conditioner is determined as the first superheat degree.

[0125] In some embodiments, if the first superheat degree of the dry-type air conditioner is higher than the target superheat degree, the opening degree of the electronic expansion valve of the dry-type air conditioner is increased, so as to increase the refrigerant flow, until the first superheat degree of the dry-type air conditioner is equal to the target superheat degree; if the first superheat degree of the dry-type air conditioner is lower than the target superheat degree, the opening degree of the electronic expansion valve of the dry-type air conditioner is decreased, so as to decrease the refrigerant flow, until the first superheat degree of the dry-type air conditioner is equal to the target superheat degree.

[0126] The process of adjusting the opening degree of the electronic expansion valve of the dry-type air conditioner can be that the opening degree of the electronic expansion valve is increased by a preset unit amount each time, or the opening degree of the electronic expansion valve is decreased by a preset unit amount each time.

[0127] In some embodiments, the opening degree of the electronic expansion valve of the wet-type air conditioner is controlled by the following manner:

[0128] According to the size relationship between a second superheat degree of the wet-type air conditioner and a target superheat degree, the opening degree of the electronic expansion valve of the wet-type air conditioner is controlled, wherein the second superheat degree is determined according to a pressure value and a temperature value detected by the wet-type air conditioner; and the target superheat degree is preset.

[0129] In the implementation, the second superheat degree is determined by the following manner:

[0130] According to the pressure value detected by the pressure sensor of the wet-type air conditioner and a corresponding relationship table of the saturation pressure and the saturation temperature of the refrigerant, the corresponding saturation temperature in the corresponding relationship table when the saturation pressure is the pressure value is searched, and the temperature value obtained by subtracting the saturation temperature from the temperature value detected by the temperature sensor of the wet-type air conditioner is determined as the second superheat degree.

[0131] In some embodiments, if the second superheat degree of the wet air conditioner is higher than the target superheat degree, the opening of the electronic expansion valve of the wet air conditioner is increased to increase the refrigerant flow until the second superheat degree of the wet air conditioner is equal to the target superheat degree; if the second superheat degree of the wet air conditioner is lower than the target superheat degree, the opening of the electronic expansion valve of the wet air conditioner is reduced to reduce the refrigerant flow until the second superheat degree of the wet air conditioner is equal to the target superheat degree.

[0132] The process of adjusting the opening of the electronic expansion valve of the wet air conditioner can be to increase the opening of the electronic expansion valve by a preset unit amount each time, or to reduce the opening of the electronic expansion valve by a preset unit amount each time.

[0133] In some embodiments, the present embodiment further provides any one of the following processing methods when it is determined that the evaporator of the dry air conditioner has condensate:

[0134] Processing method 1) if it is determined that the evaporator of the dry air conditioner has condensate, an alarm is given and the operation is stopped;

[0135] Processing method 2) if it is determined that the evaporator of the dry air conditioner has condensate, the target evaporation temperature of the dry air conditioner is increased.

[0136] In the implementation, whether the evaporator has condensate can be detected by a water immersion sensor of the dry air conditioner.

[0137] In some embodiments, the present embodiment further provides a method for calculating the refrigeration capacity of a compressor, and the specific calculation steps are as follows:

[0138] 1) determining the total refrigeration capacity of the terminal air conditioners according to the refrigeration capacity of each terminal air conditioner;

[0139] In the implementation, the sum of the refrigeration capacities of all terminal air conditioners in the running state is determined as the total refrigeration capacity, wherein the terminal air conditioners include dry air conditioners and wet air conditioners.

[0140] In the implementation, the refrigeration capacity of each terminal air conditioner is determined by any one of the following methods:

[0141] Method 1a) the same method is used to determine the refrigeration capacity of any one terminal air conditioner.

[0142] For any one terminal air conditioner, the refrigeration demand of the terminal air conditioner is determined according to the detected temperature value, the set target temperature and the set accuracy, and the refrigeration capacity of the terminal air conditioner is determined according to the refrigeration demand and the second rated refrigeration capacity of the terminal air conditioner.

[0143] Optionally, the proportional method and / or PID algorithm is used to determine the cooling demand of the terminal air conditioner according to the detected temperature value, the set target temperature and the set accuracy. For example, the detected temperature value is 21℃, the set target temperature is 23℃, and the set accuracy is 2℃, then the cooling demand of any one terminal air conditioner = (23-21) / 2 = 100%.

[0144] In the implementation, the product of the cooling demand of any one terminal air conditioner and the second rated cooling capacity of the terminal air conditioner is determined as the cooling capacity of the terminal air conditioner.

[0145] Method 1b) Dry air conditioner and wet air conditioner use different methods to determine the cooling capacity.

[0146] For any one dry air conditioner:

[0147] According to the temperature value detected by the dry air conditioner, the target evaporating temperature obtained, the theoretical supply air temperature of the dry air conditioner is determined, and according to the theoretical supply air temperature, the temperature value and the target evaporating temperature, the cooling capacity of the dry air conditioner is determined;

[0148] In the implementation, the cooling capacity of the dry air conditioner is determined according to the following formula:

[0149] W*C*ρ*(Th-Ts) = KF(0.5*(Th+Ts)-Tz) Formula (1);

[0150] Q ML = KF(0.5*(Th+Ts)-Tz) Formula (2);

[0151] In formula (1), Ts represents the theoretical supply air temperature, Th represents the temperature value detected by the dry air conditioner, Tz represents the target evaporating temperature, W represents the air volume, C represents the specific heat of air, ρ represents the air density, K represents the heat transfer coefficient, and F represents the heat transfer area. In formula (1), the temperature value Th detected by the dry air conditioner and the target evaporating temperature Tz are substituted into formula (1), and the theoretical supply air temperature Ts of the dry air conditioner can be obtained.

[0152] In formula (2), Q ML represents the cooling capacity of the dry air conditioner, Ts represents the theoretical supply air temperature, Th represents the temperature value detected by the dry air conditioner, Tz represents the target evaporating temperature, K represents the heat transfer coefficient, and F represents the heat transfer area. In formula (2), the theoretical supply air temperature Ts of the dry air conditioner, the temperature value Th detected by the dry air conditioner and the target evaporating temperature Tz are substituted into formula (2), and the cooling capacity of the dry air conditioner can be obtained.

[0153] The target evaporating temperature Tz is obtained as follows:

[0154] According to the temperature value detected by the temperature sensor of the dry air conditioner and the humidity value detected by the humidity sensor, an air dew point temperature corresponding to the temperature value and the humidity value is determined; wherein, the corresponding air dew point temperature can be found in a corresponding relationship table of air temperature, air humidity and air dew point temperature, with the air temperature being the detected temperature value and the air humidity being the detected humidity value. According to the air dew point temperature, a target evaporation temperature of the refrigerant of the dry air conditioner is determined; wherein, the target evaporation temperature Tz = air dew point temperature + preset temperature value.

[0155] For any one wet air conditioner:

[0156] According to the temperature value detected by the temperature sensor of the dry air conditioner and the humidity value detected by the humidity sensor, an air dew point temperature corresponding to the temperature value and the humidity value is determined; wherein, the corresponding air dew point temperature can be found in a corresponding relationship table of air temperature, air humidity and air dew point temperature, with the air temperature being the detected temperature value and the air humidity being the detected humidity value. According to the air dew point temperature, a target evaporation temperature of the refrigerant of the dry air conditioner is determined; wherein, the target evaporation temperature Tz = air dew point temperature + preset temperature value.

[0157] Among them, the implementation principle of the method for determining the refrigerating capacity of the wet air conditioner can adopt the implementation principle of the above-mentioned mode 1a), which will not be described here.

[0158] 2) According to the first rated refrigerating capacity of the compressor in the multi-split air conditioning system and the total refrigerating capacity, the refrigerating demand of the compressor is determined;

[0159] The ratio of the total refrigerating capacity to the first rated refrigerating capacity of the compressor is determined as the refrigerating demand of the compressor; that is, the refrigerating demand of the compressor = total refrigerating capacity / first rated refrigerating capacity.

[0160] 3) Start the compressor to refrigerate according to the refrigerating demand.

[0161] Each terminal air conditioner in the embodiment calculates the refrigerating capacity of each terminal air conditioner according to the temperature detected by the temperature sensor and the set target temperature and set accuracy. The refrigerating capacity is transmitted to the main controller through the data line, the total refrigerating capacity is calculated, the refrigerating capacity demand of the compressor is further calculated, and the compressor is started to realize refrigeration according to the refrigerating capacity demand of the compressor.

[0162] In some embodiments, as shown in Figure 3 The embodiment also provides a schematic diagram of a multi-split air conditioning system, which includes a condenser 300, a dry air conditioner 301 and a wet air conditioner 302, a compressor 303, and a main controller 304; wherein:

[0163] The dry air conditioner 301 includes a dry evaporator 301a, a pressure control valve 301b, an electronic expansion valve 301c, and a terminal controller 301d.

[0164] The wet air conditioner 302 comprises a wet evaporator 302a, a pressure control valve 302b (optional), an electronic expansion valve 302c, and an end controller 302d. The pressure control valve 302b further comprises a pressure sensor and a temperature sensor.

[0165] In the figure, To represents the temperature value detected by the temperature sensor corresponding to the main controller, Po represents the pressure value detected by the pressure sensor of the main controller, Pg represents the pressure value detected by the pressure sensor of any end air conditioner (including a dry air conditioner and a wet air conditioner), Tg represents the temperature value detected by the temperature sensor of any end air conditioner, and S represents the water immersion sensor of any end air conditioner.

[0166] The dry air conditioner refrigeration cycle is as follows: The wet air conditioner refrigeration cycle is as follows:

[0167] As shown in the figure, the embodiment provides a refrigeration process of a dry air conditioner. The specific implementation steps of the process are as follows: Figure 4

[0168] Step 400: The dry air conditioner determines the air dew point temperature according to the temperature detected by the temperature sensor and the humidity detected by the humidity sensor.

[0169] Step 401: The dry air conditioner determines the target evaporation temperature of the refrigerant according to the air dew point temperature.

[0170] Step 402: The dry air conditioner determines the target evaporation pressure corresponding to the target evaporation temperature according to the target evaporation temperature.

[0171] Step 403: The dry air conditioner determines the first superheat degree according to the pressure value detected by the pressure sensor and the temperature value detected by the temperature sensor.

[0172] Step 404: The dry air conditioner controls the opening degree of the electronic expansion valve according to the size relationship between the first superheat degree of the dry air conditioner and the preset target superheat degree.

[0173] In the implementation, if the first superheat degree is greater than the target superheat degree, the opening degree of the electronic expansion valve is adjusted to increase the refrigerant flow; if the first superheat degree is less than the target superheat degree, the opening degree of the electronic expansion valve is adjusted to reduce the refrigerant flow.

[0174] Step 405: The dry air conditioner controls the opening degree of the pressure control valve according to the size relationship between the pressure value detected by the pressure sensor and the target evaporation pressure.

[0175] In the implementation, if the pressure value is greater than the target evaporation pressure, the opening degree of the pressure control valve is adjusted to increase the refrigerant flow and reduce the pressure; if the pressure value is less than the target evaporation pressure, the opening degree of the pressure control valve is adjusted to reduce the refrigerant flow and increase the pressure. ​

[0176] As Figure 5 shown, the embodiment provides a dehumidification process of a wet air conditioner, and the specific implementation steps of the process are as follows:

[0177] Step 500, determining a second superheat degree according to a pressure value detected by a pressure sensor of the wet air conditioner and a temperature value detected by a temperature sensor of the wet air conditioner;

[0178] Step 501, controlling an opening degree of an electronic expansion valve of the wet air conditioner according to a size relationship between the second superheat degree and a preset target superheat degree;

[0179] In implementation, when the second superheat degree is greater than the target superheat degree, the opening degree of the electronic expansion valve is adjusted to increase the refrigerant flow; and when the second superheat degree is less than the target superheat degree, the opening degree of the electronic expansion valve is adjusted to reduce the refrigerant flow.

[0180] Step 502, controlling an opening degree of a pressure control valve of the wet air conditioner to be a maximum opening degree.

[0181] Wherein, the wet air conditioner can not be installed with the pressure sensor and the temperature sensor, and if the pressure sensor and the temperature sensor are installed, the opening degree of the pressure control valve of the wet air conditioner can be controlled to be the maximum opening degree.

[0182] Embodiment 2, based on the same inventive concept, the embodiment of the present application also provides a multi-split air conditioning system, since the system is the system in the method of the embodiment of the present application, and the principle of solving the problem of the system is similar to that of the method, therefore, the implementation of the system can be referred to the implementation of the method, and the repeated parts will not be described here.

[0183] As Figure 6 shown, the multi-split air conditioning system includes an outdoor unit 600, an end air conditioner 601, and a controller 602; wherein:

[0184] The end air conditioner in the embodiment includes a plurality of. The end air conditioner 601 includes a dry air conditioner and a wet air conditioner, wherein the sensitivity of the installation position of the dry air conditioner to water leakage is higher than that of the installation position of the wet air conditioner to water leakage;

[0185] The controller 602 is specifically configured to perform:

[0186] controlling a target evaporation temperature of the dry air conditioner to be higher than an air dew point temperature, so that the dry air conditioner is in a refrigeration mode without generating condensate water;

[0187] controlling a target evaporation temperature of the wet air conditioner to be not higher than the air dew point temperature, so that the wet air conditioner enters a dehumidification mode.

[0188] As an optional implementation, the controller is specifically configured to perform:

[0189] The target evaporation temperature of the dry air conditioner is controlled to be higher than the air dew point temperature by adjusting the opening of the pressure control valve of the dry air conditioner.

[0190] As an optional implementation, the controller is specifically configured to perform:

[0191] If it is determined that the air dew point temperature detected by any one terminal air conditioner is greater than the preset dew point temperature, the target evaporation temperature of the wet air conditioner is controlled to be not higher than the air dew point temperature; or,

[0192] If it is determined that the humidity of the data center exceeds the humidity threshold, the target evaporation temperature of the wet air conditioner is controlled to be not higher than the air dew point temperature.

[0193] As an optional implementation, the controller is specifically configured to perform:

[0194] The target evaporation temperature of the wet air conditioner without a pressure control valve is determined to be not higher than the air dew point temperature; or,

[0195] The target evaporation temperature of the wet air conditioner is determined to be not higher than the air dew point temperature by adjusting the pressure control valve of the wet air conditioner to the maximum opening.

[0196] As an optional implementation, the controller is specifically configured to perform:

[0197] The opening of the electronic expansion valve of the dry air conditioner is controlled to adjust the refrigerant flow in the cooling mode of the dry air conditioner; and / or,

[0198] The opening of the electronic expansion valve of the wet air conditioner is controlled to make the wet air conditioner enter the cooling mode and adjust the refrigerant flow in the cooling mode.

[0199] As an optional implementation, the controller is specifically configured to perform:

[0200] The opening of the electronic expansion valve of the dry air conditioner is controlled according to the size relationship between the first superheat degree of the dry air conditioner and the preset target superheat degree, wherein the first superheat degree is determined according to the pressure value and the temperature value detected by the dry air conditioner;

[0201] The opening of the electronic expansion valve of the wet air conditioner includes:

[0202] The opening of the electronic expansion valve of the wet air conditioner is controlled according to the size relationship between the second superheat degree of the wet air conditioner and the preset target superheat degree, wherein the second superheat degree is determined according to the pressure value and the temperature value detected by the wet air conditioner.

[0203] As an optional implementation, the controller is specifically configured to further perform:

[0204] determining a total cooling capacity according to the cooling capacity of each terminal air conditioner;

[0205] determining a cooling demand of the compressor according to the first rated cooling capacity of the compressor in the multi-split air conditioning system and the total cooling capacity;

[0206] starting the compressor to perform cooling according to the cooling demand.

[0207] Optionally, the ratio of the total cooling capacity to the first rated cooling capacity of the compressor is determined as the cooling demand of the compressor; that is, the cooling demand of the compressor = total cooling capacity / first rated cooling capacity.

[0208] As an optional implementation, the controller is specifically configured to determine the cooling capacity of each terminal air conditioner by:

[0209] for any one terminal air conditioner, determining a cooling demand of the terminal air conditioner according to the detected temperature value, the set target temperature and the set accuracy, and determining the cooling capacity of the terminal air conditioner according to the cooling demand and the second rated cooling capacity of the terminal air conditioner.

[0210] Optionally, the product of the cooling demand of any one terminal air conditioner and the second rated cooling capacity of the terminal air conditioner is determined as the cooling capacity of the terminal air conditioner.

[0211] As an optional implementation, the controller is specifically configured to determine the cooling capacity of each terminal air conditioner by:

[0212] for any one dry air conditioner, determining a theoretical supply air temperature of the dry air conditioner according to the detected temperature value and the obtained target evaporating temperature of the dry air conditioner, and determining the cooling capacity of the dry air conditioner according to the theoretical supply air temperature, the temperature value and the target evaporating temperature.

[0213] for any one wet air conditioner, determining a cooling demand according to the detected temperature value, the set target temperature and the set accuracy of the wet air conditioner, and determining the cooling capacity of the wet air conditioner according to the cooling demand and the third rated cooling capacity of the wet air conditioner.

[0214] Optionally, the cooling capacity of the dry air conditioner is determined according to the following formula:

[0215] W*C*ρ*(Th-Ts) = KF(0.5*(Th+Ts)-Tz) Formula (1).

[0216] Q ML = KF(0.5*(Th+Ts)-Tz) Formula (2) ;

[0217] In Formula (1), Ts represents a theoretical air supply temperature, Th represents a temperature value detected by the dry air conditioner, Tz represents a target evaporation temperature, W represents an air volume, C represents an air specific heat, p represents an air density, K represents a heat transfer coefficient, and F represents a heat transfer area. W and F can be calculated. By substituting Th and Tz into Formula (1), the theoretical air supply temperature Ts of the dry air conditioner can be obtained.

[0218] In Formula (2), Q ML represents a refrigerating capacity of the dry air conditioner, Ts represents a theoretical air supply temperature, Th represents a temperature value detected by the dry air conditioner, Tz represents a target evaporation temperature, K represents a heat transfer coefficient, and F represents a heat transfer area. By substituting Ts, Th, and Tz into Formula (2), the refrigerating capacity of the dry air conditioner can be obtained.

[0219] Optionally, the product of the refrigerating requirement of any one wet air conditioner and the third rated refrigerating capacity of the wet air conditioner is determined as the refrigerating capacity of the wet air conditioner.

[0220] As an optional implementation, the controller is specifically configured to further perform:

[0221] if it is determined that the evaporator of the dry air conditioner has condensate water, alarming and stopping operation; or,

[0222] if it is determined that the evaporator of the dry air conditioner has condensate water, increasing the target evaporation temperature of the dry air conditioner.

[0223] Embodiment 3: Based on the same inventive concept, the present application also provides an apparatus for dry-wet separation operation of an end air conditioner. Since the apparatus is the apparatus in the method of the present application, and the apparatus solves the problem by the similar principle as the method, the implementation of the apparatus can be referred to the implementation of the method, and the repeated parts will not be described herein.

[0224] As Figure 7 shown in the figure, the apparatus includes a processor 700 and a memory 701, the memory is used to store programs executable by the processor, and the processor is used to read the programs in the memory and perform the following steps:

[0225] The end air conditioner in the multi-split air conditioning system of the data center is divided into a dry type air conditioner and a wet type air conditioner, wherein the installation position of the dry type air conditioner is more sensitive to water leakage than the installation position of the wet type air conditioner;

[0226] The target evaporation temperature of the dry type air conditioner is controlled to be higher than the air dew point temperature, so that the dry type air conditioner is in a refrigeration mode without condensate water;

[0227] The target evaporation temperature of the wet type air conditioner is controlled to be not higher than the air dew point temperature, so that the wet type air conditioner is in a dehumidification mode.

[0228] As an optional implementation, the processor is specifically configured to perform:

[0229] The target evaporation temperature of the dry type air conditioner is controlled to be higher than the air dew point temperature by adjusting the opening degree of the pressure control valve of the dry type air conditioner.

[0230] As an optional implementation, the processor is specifically configured to perform:

[0231] If it is determined that the air dew point temperature detected by any one of the end air conditioners is greater than a preset dew point temperature, the target evaporation temperature of the wet type air conditioner is controlled to be not higher than the air dew point temperature; or,

[0232] If it is determined that the humidity of the data center exceeds a humidity threshold, the target evaporation temperature of the wet type air conditioner is controlled to be not higher than the air dew point temperature.

[0233] As an optional implementation, the processor is specifically configured to perform:

[0234] The target evaporation temperature of the wet type air conditioner without a pressure control valve is determined to be not higher than the air dew point temperature; or,

[0235] The target evaporation temperature of the wet type air conditioner is determined to be not higher than the air dew point temperature by adjusting the pressure control valve of the wet type air conditioner to the maximum opening degree.

[0236] As an optional implementation, the processor is specifically configured to perform:

[0237] The opening degree of the electronic expansion valve of the dry type air conditioner is controlled to adjust the refrigerant flow in the refrigeration mode of the dry type air conditioner; and / or,

[0238] The opening degree of the electronic expansion valve of the wet type air conditioner is controlled to make the wet type air conditioner enter the refrigeration mode and adjust the refrigerant flow in the refrigeration mode.

[0239] As an optional implementation, the processor is specifically configured to perform:

[0240] controlling an opening degree of an electronic expansion valve of the dry air conditioner according to a size relationship between a first superheat degree of the dry air conditioner and a preset target superheat degree, wherein the first superheat degree is determined according to a pressure value and a temperature value detected by the dry air conditioner;

[0241] controlling an opening degree of an electronic expansion valve of the dry air conditioner according to a size relationship between a first superheat degree of the dry air conditioner and a preset target superheat degree, wherein the first superheat degree is determined according to a pressure value and a temperature value detected by the dry air conditioner;

[0242] controlling an opening degree of an electronic expansion valve of the dry air conditioner according to a size relationship between a first superheat degree of the dry air conditioner and a preset target superheat degree, wherein the first superheat degree is determined according to a pressure value and a temperature value detected by the dry air conditioner;

[0243] As an optional implementation, the processor is specifically configured to perform:

[0244] determining a total cooling capacity of the terminal air conditioners according to the cooling capacity of each terminal air conditioner;

[0245] determining a cooling demand of the compressor in the VRF air conditioning system according to a first rated cooling capacity of the compressor and the total cooling capacity;

[0246] starting the compressor to perform cooling according to the cooling demand.

[0247] As an optional implementation, the processor is specifically configured to determine the cooling capacity of each terminal air conditioner by:

[0248] for any one terminal air conditioner, determining a cooling demand of the terminal air conditioner according to a detected temperature value, a set target temperature and a set accuracy, and determining a cooling capacity of the terminal air conditioner according to the cooling demand and a second rated cooling capacity of the terminal air conditioner.

[0249] As an optional implementation, the processor is specifically configured to determine the cooling capacity of each terminal air conditioner by:

[0250] for any one dry air conditioner, determining a theoretical supply air temperature of the dry air conditioner according to a detected temperature value of the dry air conditioner and an obtained target evaporating temperature, and determining a cooling capacity of the dry air conditioner according to the theoretical supply air temperature, the temperature value and the target evaporating temperature;

[0251] for any one wet air conditioner, determining a cooling demand according to a detected temperature value of the wet air conditioner, a set target temperature and a set accuracy, and determining a cooling capacity of the wet air conditioner according to the cooling demand and a third rated cooling capacity of the wet air conditioner.

[0252] As an optional implementation, the processor is specifically configured to execute:

[0253] if it is determined that the evaporator of the dry air conditioner has condensate, alarming and stopping operation; or,

[0254] if it is determined that the evaporator of the dry air conditioner has condensate, increasing the target evaporation temperature of the dry air conditioner.

[0255] Embodiment 4, based on the same inventive concept, the present application embodiment also provides a device for dry-wet separation operation of an end air conditioner. Since the device is the device in the method of the embodiment of the present application, and the device solves the problem by the similar principle as the method, therefore, the implementation of the device can be referred to the implementation of the method, and the repeated parts will not be described here.

[0256] As shown in Figure 8 , the device comprises:

[0257] a division unit 800, configured to divide end air conditioners in a VAV air conditioning system of a data machine room into dry air conditioners and wet air conditioners, wherein the installation position of the dry air conditioner is more sensitive to water leakage than the installation position of the wet air conditioner;

[0258] a first control unit 801, configured to control the target evaporation temperature of the dry air conditioner to be higher than the air dew point temperature, so that the dry air conditioner is in a condensate-free refrigeration mode;

[0259] a second control unit 802, configured to control the target evaporation temperature of the wet air conditioner to be not higher than the air dew point temperature, so that the wet air conditioner is in a dehumidification mode.

[0260] As an optional implementation, the first control unit is specifically configured to:

[0261] control the target evaporation temperature of the dry air conditioner to be higher than the air dew point temperature by adjusting the opening degree of the pressure control valve of the dry air conditioner.

[0262] As an optional implementation, the second control unit is specifically configured to:

[0263] if it is determined that the air dew point temperature detected by any one of the end air conditioners is greater than a preset dew point temperature, control the target evaporation temperature of the wet air conditioner to be not higher than the air dew point temperature; or,

[0264] if it is determined that the humidity of the data machine room exceeds a humidity threshold, control the target evaporation temperature of the wet air conditioner to be not higher than the air dew point temperature.

[0265] As an optional implementation, the second control unit is specifically configured to:

[0266] determining that a target evaporating temperature of the wet-type air conditioner is not higher than the air dew point temperature when a pressure control valve is not installed; or

[0267] determining that a target evaporating temperature of the wet-type air conditioner is not higher than the air dew point temperature by adjusting the pressure control valve of the wet-type air conditioner to the maximum opening degree.

[0268] As an optional implementation, the control unit further comprises an opening degree control unit configured to:

[0269] control the opening degree of the electronic expansion valve of the dry-type air conditioner to adjust the refrigerant flow in the cooling mode; and / or

[0270] control the opening degree of the electronic expansion valve of the wet-type air conditioner to make the wet-type air conditioner enter the cooling mode and adjust the refrigerant flow in the cooling mode.

[0271] As an optional implementation, the control unit is specifically configured to:

[0272] control the opening degree of the electronic expansion valve of the dry-type air conditioner according to the size relationship between a first superheat degree of the dry-type air conditioner and a preset target superheat degree, wherein the first superheat degree is determined according to the pressure value and the temperature value detected by the dry-type air conditioner.

[0273] control the opening degree of the electronic expansion valve of the wet-type air conditioner according to the size relationship between a second superheat degree of the wet-type air conditioner and a preset target superheat degree, wherein the second superheat degree is determined according to the pressure value and the temperature value detected by the wet-type air conditioner.

[0274] As an optional implementation, the control unit further comprises a refrigeration unit configured to:

[0275] determine the total refrigeration capacity of the terminal air conditioners according to the refrigeration capacity of each terminal air conditioner.

[0276] determine the refrigeration demand of the compressor in the multi-split air conditioning system according to the first rated refrigeration capacity of the compressor and the total refrigeration capacity.

[0277] start the compressor to perform refrigeration according to the refrigeration demand.

[0278] As an optional implementation, the refrigeration unit is specifically configured to determine the refrigeration capacity of each terminal air conditioner by:

[0279] for any one terminal air conditioner, determine the refrigeration demand of the terminal air conditioner according to the detected temperature value, the set target temperature and the set accuracy, and determine the refrigeration capacity of the terminal air conditioner according to the refrigeration demand and the second rated refrigeration capacity of the terminal air conditioner.

[0280] As an optional implementation, the refrigeration unit is specifically used for determining the refrigeration capacity of each terminal air conditioner by the following manner:

[0281] For any one dry air conditioner, a theoretical supply air temperature of the dry air conditioner is determined according to a temperature value detected by the dry air conditioner and a target evaporating temperature obtained, and a refrigeration capacity of the dry air conditioner is determined according to the theoretical supply air temperature, the temperature value and the target evaporating temperature.

[0282] For any one wet air conditioner, a refrigeration demand is determined according to a temperature value detected by the wet air conditioner, a target temperature set and a set accuracy, and a refrigeration capacity of the wet air conditioner is determined according to the refrigeration demand and a third rated refrigeration capacity of the wet air conditioner.

[0283] As an optional implementation, the application further comprises a condensate water solution unit for:

[0284] if it is determined that the evaporator of the dry air conditioner has condensate water, an alarm is given and the operation is stopped; or

[0285] if it is determined that the evaporator of the dry air conditioner has condensate water, the target evaporating temperature of the dry air conditioner is increased.

[0286] Based on the same inventive concept, the application further provides a computer storage medium having a computer program stored thereon, which, when executed by a processor, implements the following steps:

[0287] The terminal air conditioners in the one-to-many air conditioning system of the data machine room are divided into dry air conditioners and wet air conditioners, wherein the installation position of the dry air conditioner is more sensitive to water leakage than the installation position of the wet air conditioner.

[0288] The target evaporating temperature of the dry air conditioner is controlled to be higher than the air dew point temperature, so that the dry air conditioner is in a refrigeration mode without condensate water.

[0289] The target evaporating temperature of the wet air conditioner is controlled to be not higher than the air dew point temperature, so that the wet air conditioner is in a dehumidification mode.

[0290] Those skilled in the art should understand that the embodiments of the application can be provided as a method, a system or a computer program product. Therefore, the application can be in the form of a complete hardware embodiment, a complete software embodiment or an embodiment combining software and hardware aspects. Moreover, the application can be in the form of a computer program product implemented on one or more computer usable storage media (including but not limited to disk storage and optical storage, etc.) containing computer usable program code.

[0291] The present application is described in reference to the flowchart and / or block diagrams of the methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each block of the flowchart and / or block diagrams, and combinations of blocks in the flowchart and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more flowcharts and / or blocks Figure 1 apparatus that perform the functions specified in the flowchart and / or block diagram block or blocks.

[0292] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the flowchart and / or block diagram block or blocks. Figure 1 one or more flowcharts and / or blocks Figure 1 apparatus that perform the functions specified in the flowchart and / or block diagram block or blocks.

[0293] The computer program instructions can also be loaded into a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the flowchart and / or block diagram block or blocks. Figure 1 one or more flowcharts and / or blocks Figure 1 apparatus that perform the functions specified in the flowchart and / or block diagram block or blocks.

[0294] Obviously, numerous modifications and variations of the present application are possible in light of the above teachings. It is therefore to be understood that within the scope of the apparatus and methods disclosed herein, the application can be practiced otherwise than as specifically described.

Claims

1. A method for operating a terminal air conditioner in a dry and wet separation mode, characterized by, The method comprises: Dividing end air conditioners in a multi-split air conditioning system of a data room into dry air conditioners and wet air conditioners, wherein the installation position of the dry air conditioner is more sensitive to water leakage than the installation position of the wet air conditioner; Controlling the target evaporation temperature of the dry air conditioner to be higher than the air dew point temperature, so that the dry air conditioner is in a refrigeration mode without condensate water; Controlling the target evaporation temperature of the wet air conditioner to be not higher than the air dew point temperature, so that the wet air conditioner is in a dehumidification mode; The method further comprises: Controlling the opening degree of the electronic expansion valve of the dry air conditioner to adjust the refrigerant flow in the refrigeration mode; and / or, Controlling the opening degree of the electronic expansion valve of the wet air conditioner to enter the refrigeration mode and adjust the refrigerant flow in the refrigeration mode; The control of the opening degree of the electronic expansion valve of the dry air conditioner comprises: Controlling the opening degree of the electronic expansion valve of the dry air conditioner according to the size relationship between the first superheat degree of the dry air conditioner and the preset target superheat degree, wherein the first superheat degree is determined according to the pressure value and the temperature value detected by the dry air conditioner; The control of the opening degree of the electronic expansion valve of the wet air conditioner comprises: Controlling the opening degree of the electronic expansion valve of the wet air conditioner according to the size relationship between the second superheat degree of the wet air conditioner and the preset target superheat degree, wherein the second superheat degree is determined according to the pressure value and the temperature value detected by the wet air conditioner.

2. The method of claim 1, wherein, The control of the target evaporation temperature of the dry air conditioner to be higher than the air dew point temperature comprises: Controlling the target evaporation temperature of the dry air conditioner to be higher than the air dew point temperature by adjusting the opening degree of the pressure control valve of the dry air conditioner.

3. The method of claim 1, wherein, The control of the target evaporation temperature of the wet air conditioner to be not higher than the air dew point temperature comprises: If it is determined that the air dew point temperature detected by any one of the end air conditioners is greater than the preset dew point temperature, the target evaporation temperature of the wet air conditioner is controlled to be not higher than the air dew point temperature; or, If it is determined that the humidity of the data room exceeds the humidity threshold, the target evaporation temperature of the wet air conditioner is controlled to be not higher than the air dew point temperature.

4. The method of claim 1, wherein, The control of the target evaporation temperature of the wet air conditioner to be not higher than the air dew point temperature comprises: Determining the target evaporation temperature of the wet air conditioner without a pressure control valve to be not higher than the air dew point temperature; or, Determining the target evaporation temperature of the wet air conditioner to be not higher than the air dew point temperature by adjusting the pressure control valve of the wet air conditioner to the maximum opening degree.

5. The method according to any one of claims 1 to 4, characterized in that, The method further comprises: Determining the total refrigeration capacity of the end air conditioners according to the refrigeration capacity of each end air conditioner; Determining the refrigeration demand of the compressor in the multi-split air conditioning system according to the first rated refrigeration capacity of the compressor and the total refrigeration capacity; Starting the compressor to refrigerate according to the refrigeration demand.

6. The method of claim 5, wherein, The refrigeration capacity of each end air conditioner is determined by: For any one terminal air conditioner, according to the detected temperature value, the set target temperature and the set accuracy, the refrigeration demand of the terminal air conditioner is determined, and according to the refrigeration demand and the second rated refrigeration capacity of the terminal air conditioner, the refrigeration capacity of the terminal air conditioner is determined; or, For any one dry air conditioner, according to the temperature value detected by the dry air conditioner and the target evaporation temperature obtained, the theoretical supply air temperature of the dry air conditioner is determined, and according to the theoretical supply air temperature, the temperature value and the target evaporation temperature, the refrigeration capacity of the dry air conditioner is determined; or, For any one wet air conditioner, according to the temperature value detected by the wet air conditioner, the set target temperature and the set accuracy, the refrigeration demand is determined, and according to the refrigeration demand and the third rated refrigeration capacity of the wet air conditioner, the refrigeration capacity of the wet air conditioner is determined.

7. The method according to any of claims 1 to 4, 6, characterized in that, The method further comprises: If it is determined that the evaporator of the dry air conditioner has condensate water, an alarm is given and the operation is stopped; or, If it is determined that the evaporator of the dry air conditioner has condensate water, the target evaporation temperature of the dry air conditioner is increased.

8. A multi-split air conditioning system, characterized in that, The system comprises an outdoor unit, a terminal air conditioner, and a controller; The controller is specifically configured to perform: The terminal air conditioner in the one-to-many air conditioner system of the data center is divided into a dry air conditioner and a wet air conditioner, wherein the sensitivity of the installation position of the dry air conditioner to water leakage is higher than that of the installation position of the wet air conditioner to water leakage; The target evaporation temperature of the dry air conditioner is controlled to be higher than the air dew point temperature, so that the dry air conditioner is in a refrigeration mode without condensate water; The target evaporation temperature of the wet air conditioner is controlled to be not higher than the air dew point temperature, so that the wet air conditioner enters a dehumidification mode; The controller is specifically further configured to perform: The opening degree of the electronic expansion valve of the dry air conditioner is controlled, so that the dry air conditioner adjusts the refrigerant flow in the refrigeration mode; and / or, The opening degree of the electronic expansion valve of the wet air conditioner is controlled, so that the wet air conditioner enters the refrigeration mode and adjusts the refrigerant flow in the refrigeration mode; The controller is specifically configured to perform: According to the size relationship between the first superheat degree of the dry air conditioner and the preset target superheat degree, the opening degree of the electronic expansion valve of the dry air conditioner is controlled, wherein the first superheat degree is determined according to the pressure value and the temperature value detected by the dry air conditioner; The control of the opening degree of the electronic expansion valve of the wet air conditioner comprises: According to the size relationship between the second superheat degree of the wet air conditioner and the preset target superheat degree, the opening degree of the electronic expansion valve of the wet air conditioner is controlled, wherein the second superheat degree is determined according to the pressure value and the temperature value detected by the wet air conditioner.

9. The air conditioning system of claim 8, wherein, The controller is specifically configured to perform: The target evaporation temperature of the dry air conditioner is controlled to be higher than the air dew point temperature by adjusting the opening degree of the pressure control valve of the dry air conditioner.

10. The air conditioning system of claim 8, wherein, The controller is specifically configured to perform: If it is determined that the air dew point temperature detected by any one terminal air conditioner is greater than the preset dew point temperature, the target evaporation temperature of the wet air conditioner is controlled to be not higher than the air dew point temperature; or, If it is determined that the humidity of the data center exceeds a humidity threshold, the target evaporating temperature of the wet air conditioner is controlled to be not higher than the air dew point temperature.

11. The air conditioning system of claim 8, wherein, The controller is specifically configured to perform: determining that the target evaporating temperature of the wet air conditioner without a pressure control valve is not higher than the air dew point temperature; or, determining that the target evaporating temperature of the wet air conditioner is not higher than the air dew point temperature by adjusting the pressure control valve of the wet air conditioner to the maximum opening.

12. The air conditioning system according to any one of claims 8 to 11, wherein The controller is specifically further configured to perform: determining a total cooling capacity of the terminal air conditioners according to the cooling capacity of each terminal air conditioner; determining a cooling demand of the compressor in the VRF air conditioning system according to the first rated cooling capacity of the compressor and the total cooling capacity; starting the compressor to perform cooling according to the cooling demand.

13. The air conditioning system of claim 12, wherein, The controller is specifically configured to determine the cooling capacity of each terminal air conditioner by: for any one terminal air conditioner, determining a cooling demand of the terminal air conditioner according to a detected temperature value, a set target temperature and a set accuracy, and determining the cooling capacity of the terminal air conditioner according to the cooling demand and a second rated cooling capacity of the terminal air conditioner; or, for any one dry air conditioner, determining a theoretical supply air temperature of the dry air conditioner according to a detected temperature value and a target evaporating temperature obtained by the dry air conditioner, and determining the cooling capacity of the dry air conditioner according to the theoretical supply air temperature, the temperature value and the target evaporating temperature; or, for any one wet air conditioner, determining a cooling demand according to a detected temperature value, a set target temperature and a set accuracy of the wet air conditioner, and determining the cooling capacity of the wet air conditioner according to the cooling demand and a third rated cooling capacity of the wet air conditioner.

14. The air conditioning system according to any one of claims 8 to 11 and 13, wherein The controller is specifically further configured to perform: if it is determined that the evaporator of the dry air conditioner has condensate water, alarming and stopping operation; or, if it is determined that the evaporator of the dry air conditioner has condensate water, increasing the target evaporating temperature of the dry air conditioner.

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