Dehumidification and heating control system and method for data center air conditioner in low-load and high-humidity state

Abstract

The invention provides a dehumidification and heating control system and method based on a low-load and high-humidity state of a data center air conditioner. The system comprises a condensation assembly, an evaporation assembly and an injection assembly. The evaporation assembly comprises a first evaporator and a second evaporator; the first electronic expansion valve is used for controlling the first volume of the first liquid output by the condensation assembly input to the first evaporator through the first pipeline; the second electronic expansion valve is used for controlling the second volume of the first liquid output by the condensation assembly to be input into the second evaporator through a second pipeline; the first liquid with the first capacity is heated through the first evaporator, and a first refrigerant is obtained; the high-pressure and high-temperature liquid of the second capacity is refrigerated through a second evaporator, and a second refrigerant is obtained; the spraying assembly is used for mixing the first refrigerant and the second refrigerant under the condition that the first electromagnetic valve and the second electromagnetic valve are connected to form a mixed refrigerant meeting the specific temperature and pressure; and the mixed refrigerant is transmitted to the condensation assembly through a fifth pipeline.

Description

Technical Field

[0001] This application relates to the technical field of pressure control, and in particular, to a control system and method for dehumidifying and heating based on the low-load and high-humidity state of a data center air conditioner. Background Art

[0002] In precision air conditioners, humidity is mainly adjusted through two parts. One is that when air passes through the surface of the evaporator, since the temperature is lower than the dew point of water vapor, the water vapor in the air will liquefy, thereby reducing the humidity in the air. The other is that when the humidity is lower than the set value during the refrigeration process, the humidifier will be turned on to humidify and ensure that the humidity is within the set range. Therefore, the process of dehumidification will inevitably be accompanied by a decrease in the ambient temperature, and the cooling capacity of precision air conditioners is large. At present, it is impossible to simply and cost-effectively achieve constant-temperature dehumidification in a precision air conditioner system. For this problem, there is currently no effective solution. Summary of the Invention

[0003] To solve the existing technical problems, the embodiments of this application provide a control system and method for dehumidifying and heating based on the low-load and high-humidity state of a data center air conditioner.

[0004] To achieve the above object, the technical solution of the embodiments of this application is implemented as follows:

[0005] The embodiments of this application provide a control system for dehumidifying and heating based on the low-load and high-humidity state of a data center air conditioner. The system includes: a condensation component, an evaporation component, and a spraying component; the evaporation component includes a first evaporator and a second evaporator; the condensation component is connected to the first evaporator through a first pipeline; the condensation component is connected to the second evaporator through a second pipeline; a first electronic expansion valve is provided on the first pipeline; a second electronic expansion valve is provided on the second pipeline; the first evaporator is connected to the spraying component through a third pipeline; the second evaporator is connected to the spraying component through a fourth pipeline; a first solenoid valve is provided on the third pipeline; a second solenoid valve is provided on the fourth pipeline; the spraying component is connected to the condensation component through a fifth pipeline;

[0006] The first electronic expansion valve is used to control the first capacity of the first liquid output by the condensation component and input into the first evaporator through the first pipeline;

[0007] The second electronic expansion valve is used to control the second capacity of the first liquid output by the condensation component and input into the second evaporator through the second pipeline; the first capacity is greater than the second capacity;

[0008] Among them, the first liquid with the first capacity is heated by the first evaporator to obtain a first refrigerant; the high-pressure and high-temperature liquid with the second capacity is cooled by the second evaporator to obtain a second refrigerant.

[0009] The injection assembly is used to mix the first refrigerant and the second refrigerant to form a mixed refrigerant that meets specific temperature and pressure conditions when the first solenoid valve and the second solenoid valve are conducting; the mixed refrigerant is transmitted to the condensation assembly through the fifth pipeline.

[0010] In the above solution, the system further includes a control assembly electrically connected to the first electronic expansion valve and the second electronic expansion valve respectively, which is used to send a first control signal to the first electronic expansion valve. The first control signal is used to control the conduction or closing of the first electronic expansion valve to control the input of the first liquid output by the condensation assembly into the first capacity of the first evaporator; it is also used to send a second control signal to the second electronic expansion valve. The second control signal is used to control the conduction or closing of the second electronic expansion valve to control the input of the first liquid output by the condensation assembly into the second capacity of the second evaporator.

[0011] In the above solution, the second control signal is further used to control the conduction degree of the second electronic expansion valve to control the input of the first liquid output by the condensation assembly into the second capacity of the second evaporator.

[0012] In the above solution, the power assembly includes a second gas circulation pump with a changing frequency.

[0013] The control assembly is also used to control the change of the operating frequency of the second gas circulation pump according to the change of the pressure; the degree of change of the pressure is proportional to the degree of change of the frequency.

[0014] In the above solution, the condensation assembly includes a condenser, a compressor and a gas-liquid separator. The compressor is connected to the condenser and the gas-liquid separator respectively through pipelines; the condenser is connected to the first evaporator through the first pipeline; the condenser is connected to the second evaporator through the second pipeline; the injection assembly is connected to the gas-liquid separator through the fifth pipeline; the first evaporator is connected to the gas-liquid separator through the sixth pipeline; the second evaporator is connected to the gas-liquid separator through the seventh pipeline.

[0015] The gas-liquid separator is used to separate the mixed refrigerant into a gas refrigerant and a liquid refrigerant.

[0016] The compressor is used to compress the gas refrigerant to obtain a refrigerant.

[0017] The condenser is used to condense the refrigerant to obtain the first liquid.

[0018] In the above solution, a third solenoid valve is provided on the sixth pipeline; a fourth solenoid valve is provided on the seventh pipeline; the control component is electrically connected to the first solenoid valve, the second solenoid valve, the third solenoid valve and the fourth solenoid valve respectively;

[0019] The control component is used to control the opening of the first electronic expansion valve, the opening of the second electronic expansion valve as required, the opening of the first solenoid valve, the opening of the second solenoid valve, the closing of the third solenoid valve and the closing of the fourth solenoid valve in the case of the air conditioner dehumidification and heating mode.

[0020] In the above solution, the control component is further used to control the closing of the first solenoid valve, the closing of the second solenoid valve, the opening of the third solenoid valve and the opening of the fourth solenoid valve in the case where the air conditioner does not require the dehumidification and heating mode.

[0021] In the above solution, the system further includes: a check valve; the check valve is arranged on the fourth pipeline connecting the second evaporator and the second solenoid valve;

[0022] The check valve is used to make the second refrigerant in the fourth pipeline flow unidirectionally.

[0023] In the above solution, the type of the compressor is a variable frequency compressor;

[0024] The variable frequency compressor is used to adjust the frequency according to the required refrigerating capacity; the required refrigerating capacity is related to the load degree of the air conditioner; the greater the load degree of the air conditioner, the more the required refrigerating capacity; the smaller the load degree of the air conditioner, the less the required refrigerating capacity.

[0025] The embodiment of the present application provides a control method for dehumidification and heating based on the low-load and high-humidity state of the data center air conditioner, which is applied to the above-mentioned control system for dehumidification and heating based on the low-load and high-humidity state of the data center air conditioner; the method includes:

[0026] Controlling the first liquid output by the condensing component to be input into the first capacity of the first evaporator through the first pipeline; and controlling the first liquid output by the condensing component to be input into the second capacity of the second evaporator through the second pipeline; the first capacity is greater than the second capacity; wherein, the first liquid with the first capacity is heated through the first evaporator to obtain the first refrigerant; the high-pressure and high-temperature liquid with the second capacity is refrigerated through the second evaporator to obtain the second refrigerant;

[0027] When the first solenoid valve and the first solenoid valve are in a conducting state, the first refrigerant is mixed with the second refrigerant to form a mixed refrigerant that meets specific temperature and pressure requirements; the mixed refrigerant is transmitted to the condensing assembly through the fifth pipeline.

[0028] In the above solution, the method further includes:

[0029] Sending a first control signal to the first electronic expansion valve, where the first control signal is used to control the opening or closing of the first electronic expansion valve to control the first volume of the first liquid output by the condensing assembly input to the first evaporator;

[0030] Sending a second control signal to the second electronic expansion valve, where the second control signal is used to control the opening degree or closing of the second electronic expansion valve to control the second volume of the first liquid output by the condensing assembly input to the second evaporator.

[0031] The present application also provides a computer program product, including a computer program, where the computer program, when executed by a processor, implements any step of the above method.

[0032] The present application also provides a storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements any step of the above method.

[0033] The embodiments of the present application provide a control system and method for dehumidifying and heating based on the low-load and high-humidity state of a data center air conditioner. The system includes: a condensation component, an evaporation component, and an injection component; the evaporation component includes a first evaporator and a second evaporator; the condensation component is connected to the first evaporator through a first pipeline; the condensation component is connected to the second evaporator through a second pipeline; a first electronic expansion valve is provided on the first pipeline; a second electronic expansion valve is provided on the second pipeline; the first evaporator is connected to the injection component through a third pipeline; the second evaporator is connected to the injection component through a fourth pipeline; a first solenoid valve is provided on the third pipeline; a second solenoid valve is provided on the fourth pipeline; the injection component is connected to the condensation component through a fifth pipeline; the first electronic expansion valve is used to control the first capacity of the first liquid output by the condensation component and input into the first evaporator through the first pipeline; the second electronic expansion valve is used to control the second capacity of the first liquid output by the condensation component and input into the second evaporator through the second pipeline; the first capacity is greater than the second capacity; wherein, the first liquid with the first capacity is heated through the first evaporator to obtain a first refrigerant; the high-pressure and high-temperature liquid with the second capacity is cooled through the second evaporator to obtain a second refrigerant; the injection component is used to mix the first refrigerant and the second refrigerant to form a mixed refrigerant that meets specific temperature and pressure conditions when the first solenoid valve and the second solenoid valve are turned on; the mixed refrigerant is transmitted to the condensation component through the fifth pipeline. By adopting the implementation scheme of the present application, the first electronic expansion valve controls the first capacity of the first liquid output by the condensation component and input into the first evaporator through the first pipeline; the second electronic expansion valve controls the second capacity of the first liquid output by the condensation component and input into the second evaporator through the second pipeline; wherein, the first liquid with the first capacity is heated through the first evaporator to obtain a first refrigerant; the high-pressure and high-temperature liquid with the second capacity is cooled through the second evaporator to obtain a second refrigerant; the injection component mixes the first refrigerant and the second refrigerant to form a mixed refrigerant that meets specific temperature and pressure conditions when the first solenoid valve and the second solenoid valve are turned on. Heating and cooling no longer require stopping the compressor, but only the opening and closing of the solenoid valves, which improves the reliability and lifespan of the system and also saves energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 FIG. is a schematic diagram of a control system for dehumidifying and heating based on the low-load and high-humidity state of a data center air conditioner provided by an embodiment of the present application;

[0035] Figure 2 FIG. is another schematic diagram of a control system for dehumidifying and heating based on the low-load and high-humidity state of a data center air conditioner provided by an embodiment of the present application;

[0036] Figure 3 Another schematic diagram of a dehumidification and heating control system based on the low-load and high-humidity state of the data center air conditioner provided by the embodiment of the present application;

[0037] Figure 4 A schematic diagram of an application scenario of a dehumidification and heating control system based on the low-load and high-humidity state of the data center air conditioner provided by the embodiment of the present application;

[0038] Figure 5 Another schematic diagram of an application scenario of a dehumidification and heating control system based on the low-load and high-humidity state of the data center air conditioner provided by the embodiment of the present application;

[0039] Figure 6 Another schematic diagram of an application scenario of a dehumidification and heating control system based on the low-load and high-humidity state of the data center air conditioner provided by the embodiment of the present application;

[0040] Figure 7 A schematic diagram of the implementation process of a control method for dehumidification and heating based on the low-load and high-humidity state of the data center air conditioner provided by the embodiment of the present application. Detailed implementation manners

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will further describe the specific technical solutions of the invention in detail with reference to the accompanying drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application but are not intended to limit the scope of the present application.

[0042] In a precision air conditioner, the humidity is mainly adjusted through two parts. One is that when the air passes through the surface of the evaporator, since the temperature is lower than the dew point of the water vapor, the water vapor in the air will liquefy, thereby reducing the humidity in the air. The other is that when the humidity is lower than the set value during the refrigeration process, the humidifier will be turned on for humidification to ensure that the humidity is within the set range. Therefore, the dehumidification process will inevitably be accompanied by a decrease in the ambient temperature, and the precision air conditioner has a large cooling capacity. Currently, it is impossible to simply and low-costly achieve constant temperature dehumidification in the precision air conditioner system.

[0043] Since the computer room air conditioner is often selected with a higher cooling capacity than the actual heat load during the selection process, and there is a situation where the load of small and medium-sized network points is far lower than the minimum cooling capacity of the air conditioner, the cooling capacity output of the air conditioner does not match the heat load in the computer room, resulting in the compressor of the air conditioner starting and stopping frequently with the change of the temperature in the computer room, the effective operation time of the air conditioner becomes shorter, and then the dehumidification capacity of the air conditioner decreases, and the servers in the computer room operate in an environment with a relatively high humidity.

[0044] Based on this, the embodiment of the present application provides a dehumidification and heating control system based on the low-load and high-humidity state of the data center air conditioner, Figure 1Schematic diagram of a dehumidifying and heating control system based on the low-load and high-humidity state of the data center air conditioner provided by an embodiment of the present application; Figure 2 Another schematic diagram of a dehumidifying and heating control system based on the low-load and high-humidity state of the data center air conditioner provided by an embodiment of the present application; Figure 3 Another schematic diagram of a dehumidifying and heating control system based on the low-load and high-humidity state of the data center air conditioner provided by an embodiment of the present application; Figure 4 Schematic diagram of an application scenario of a dehumidifying and heating control system based on the low-load and high-humidity state of the data center air conditioner provided by an embodiment of the present application; Figure 5 Another schematic diagram of an application scenario of a dehumidifying and heating control system based on the low-load and high-humidity state of the data center air conditioner provided by an embodiment of the present application; Figure 6 Another schematic diagram of an application scenario of a dehumidifying and heating control system based on the low-load and high-humidity state of the data center air conditioner provided by an embodiment of the present application; The following can be combined with Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 to understand. The system 100 includes: a condensation component 101, an evaporation component 102, and an injection component 103; the evaporation component 102 includes a first evaporator 1021 and a second evaporator 1022; the condensation component 101 is connected to the first evaporator 1021 through a first pipeline 111; the condensation component 101 is connected to the second evaporator 1022 through a second pipeline 112; the first pipeline 111 is provided with a first electronic expansion valve 104; the second pipeline 112 is provided with a second electronic expansion valve 105; the first evaporator 1021 is connected to the injection component 103 through a third pipeline 113; the second evaporator 1022 is connected to the injection component 103 through a fourth pipeline 114; the third pipeline 113 is provided with a first solenoid valve 106; the fourth pipeline 114 is provided with a second solenoid valve 107; the injection component 103 is connected to the condensation component 101 through a fifth pipeline 115;

[0045] The first electronic expansion valve 104 is used to control the first capacity of the first liquid output by the condensation component 101 to be input into the first evaporator 1021 through the first pipeline 111;

[0046] The second electronic expansion valve 105 is used to control the second capacity of the first liquid output by the condensation component 101 to be input into the second evaporator 1022 through the second pipeline 112; The first capacity is greater than the second capacity;

[0047] Among them, the first liquid with the first capacity is heated by the first evaporator 1021 to obtain a first refrigerant; the high-pressure and high-temperature liquid with the second capacity is cooled by the second evaporator 1022 to obtain a second refrigerant;

[0048] The injection component 103 is used to mix the first refrigerant and the second refrigerant to form a mixed refrigerant that meets specific temperature and pressure conditions when the first solenoid valve 106 and the second solenoid valve 107 are turned on; the mixed refrigerant is transmitted to the condensation component 101 through the fifth pipeline 115.

[0049] It should be noted that the dehumidification and heating control system 100 based on the low-load and high-humidity state of the data center air conditioner can be determined according to actual situations and is not limited herein. As an example, the dehumidification and heating control system 100 based on the low-load and high-humidity state of the data center air conditioner can also be understood as a control system for the data center regarding the low-load and high-humidity of the computer room air conditioner. Among them, both the low load and the high humidity can be determined according to actual situations and are not limited herein. As an example, the low load can be understood as a load amount lower than 30% of the air conditioner's cooling capacity; the high humidity can be understood as a humidity range higher than 70% RH. In practical applications, a load amount lower than 30% of the air conditioner's cooling capacity is called a low load; in a data center, generally, a humidity range higher than 70% RH is called high humidity.

[0050] The condensation component 101 can be determined according to actual situations and is not limited herein. As an example, the condensation component 101 can include a condenser, a compressor, and a gas-liquid separator.

[0051] The evaporation component 102 can be determined according to actual situations and is not limited herein. As an example, the evaporation component 102 can include an evaporator.

[0052] The evaporation component 102 includes a first evaporator 1021 and a second evaporator 1022; among them, both the first evaporator 1021 and the second evaporator 1022 can be determined according to actual situations and are not limited herein. As an example, the first evaporator 1021 can be called the first part of the evaporator, and the first part of the evaporator can also be called a reheating coil; the second evaporator 1022 can be called the second part of the evaporator.

[0053] The injection component 103 can be determined according to actual situations and is not limited herein. As an example, the injection component 103 can be an injector.

[0054] The first electronic expansion valve 104 can be determined according to the actual situation and will not be limited herein. As an example, the first electronic expansion valve 104 can also be denoted as the electronic expansion valve 1; the second electronic expansion valve 105 can also be determined according to the actual situation and will not be limited herein. As an example, the second electronic expansion valve 105 can also be denoted as the electronic expansion valve 2.

[0055] The first solenoid valve 106 can be determined according to the actual situation and will not be limited herein. As an example, the first solenoid valve 106 can also be denoted as the solenoid valve 1; the second solenoid valve 107 can also be determined according to the actual situation and will not be limited herein. As an example, the second solenoid valve 107 can also be denoted as the solenoid valve 2.

[0056] The fact that the first capacity is greater than the second capacity can be understood as that the opening degree of the first electronic expansion valve 104 is greater than that of the second electronic expansion valve 105. As an example, the first electronic expansion valve 104 can be kept in a fully open state; the second electronic expansion valve 105 can be kept in a state of being controlled as needed; wherein, the control as needed can be understood as that the system calculates the superheat of suction = compressor inlet temperature - evaporator coil outlet temperature. The greater the difference, the greater the superheat of suction, the greater the opening degree of the electronic expansion valve, and the greater the required refrigerant. The target range value of the superheat of suction is generally about 8 - 12K.

[0057] The mixed refrigerant with a specific temperature and pressure can be determined according to the actual situation and will not be limited herein. As an example, the mixed refrigerant with a specific temperature and pressure can be understood as a mixed refrigerant with medium temperature and medium pressure. In practical applications, the liquid coming out of the condenser is called a high-temperature and high-pressure liquid; the gas coming out of the evaporator is called a low-temperature and low-pressure gas; the medium after mixing the above two is called a mixed refrigerant with medium temperature and medium pressure.

[0058] In the embodiment of the present application, the first electronic expansion valve controls the first capacity of the first liquid output by the condensing assembly to be input into the first evaporator through the first pipeline; the second electronic expansion valve controls the first liquid output by the condensing assembly to be input into the second evaporator through the second pipeline to have a second capacity; wherein, the first liquid with the first capacity is heated by the first evaporator to obtain the first refrigerant; the high-temperature and high-pressure liquid with the second capacity is cooled by the second evaporator to obtain the second refrigerant; the injection assembly mixes the first refrigerant and the second refrigerant when the first solenoid valve and the second solenoid valve are in a conducting state to form a mixed refrigerant that meets specific temperature and pressure requirements. Heating and cooling no longer require stopping the compressor, but only the opening and closing of the solenoid valves, which increases the reliability and service life of the system and also saves energy.

[0059] In an alternative embodiment of the present application, the system 100 further includes a control component 108 electrically connected to the first electronic expansion valve 104 and the second electronic expansion valve 105 respectively, for sending a first control signal to the first electronic expansion valve 104, where the first control signal is used to control the opening or closing of the first electronic expansion valve 104, so as to control the first capacity of the first liquid output by the condensing component 101 input to the first evaporator 1021; and is further used to send a second control signal to the second electronic expansion valve 105, where the second control signal is used to control the opening or closing of the second electronic expansion valve 105, so as to control the second capacity of the first liquid output by the condensing component 101 input to the second evaporator 1022.

[0060] It should be noted that the control component 108 electrically connected to the first electronic expansion valve 104 and the second electronic expansion valve 105 respectively can be understood as the control component 108 being electrically connected to the first electronic expansion valve 104 and the second electronic expansion valve 105 respectively, and this electrical connection can be determined according to the actual situation and is not limited herein. As an example, this connection can be a wired connection or a wireless connection; wherein, the wired connection can be a wire connection capable of transmitting data; the wireless connection can adopt short-range communication technologies, such as Bluetooth, Zigbee, etc.; or can also adopt long-range communication technologies, such as (WiFi, Wireless Fidelity) connection.

[0061] The control component 108 can be determined according to the actual situation and is not limited herein. As an example, the control component 108 can be a controller, and the controller 108 can be a device that can send signals and receive signals, and can perform corresponding processing on the data in the received signals, which is not limited herein. As an example, the controller 108 can be an electronic device such as a computer, a workstation, a server, etc.

[0062] Both the first control signal and the second control signal can be determined according to the actual situation and are not limited herein. As an example, the first control signal and the second control signal can be electrical signals, and the opening degrees of the first electronic expansion valve 104 and the second electronic expansion valve 105 can be controlled respectively according to actual needs. As an example, the first electronic expansion valve 104 can remain fully open; the second electronic expansion valve 105 can remain in a state of being controlled as needed, for example, remain half open.

[0063] In practical applications, the first electronic expansion valve 104 remains fully open, and the second electronic expansion valve 105 can be maintained in a demand-controlled state to enable the first liquid output by the condensing assembly 101 to be input into the first capacity of the first evaporator 1021 and the second capacity of the second evaporator 1022 to which the first liquid output by the condensing assembly 101 is input.

[0064] In an alternative embodiment of the present application, the second control signal is further used to control the opening degree of the second electronic expansion valve 105 to control the second capacity of the first liquid output by the condensing assembly 101 and input into the second evaporator 1022.

[0065] It should be noted that the opening degree of the second electronic expansion valve 105 can be determined according to the actual situation and is not limited herein. As an example, the opening degree of the second electronic expansion valve 105 can be semi-open, which can be understood as half-open.

[0066] In practical applications, the second electronic expansion valve 105 can be maintained in a demand-controlled state to enable the first liquid output by the condensing assembly 101 to be input into the second capacity of the second evaporator 1022.

[0067] In an alternative embodiment of the present application, the condensing assembly 101 includes a condenser 1011, a compressor 1012, and a gas-liquid separator 1013. The compressor 1012 is connected to the condenser 1011 and the gas-liquid separator 1013 through pipelines respectively; the condenser 1011 is connected to the first evaporator 1021 through the first pipeline 111; the condenser 101 is connected to the second evaporator 1022 through the second pipeline 112; the injection assembly 103 is connected to the gas-liquid separator 1013 through the fifth pipeline 115; the first evaporator 1021 is connected to the gas-liquid separator 1013 through the sixth pipeline 116; the second evaporator 1022 is connected to the gas-liquid separator 1013 through the seventh pipeline 117;

[0068] The gas-liquid separator 1013 is used to separate the mixed refrigerant into a gaseous refrigerant and a liquid refrigerant.

[0069] The compressor 1012 is used to compress the gaseous refrigerant to obtain a refrigerant.

[0070] The condenser 1011 is used to condense the refrigerant to obtain the first liquid.

[0071] In this embodiment, the separation of the mixed refrigerant into a gas refrigerant and a liquid refrigerant can be understood as passing the mixed refrigerant into the gas-liquid separator 1013 for gas-liquid separation to obtain the gas refrigerant and the liquid refrigerant; wherein, the gas refrigerant can also be referred to as the gaseous refrigerant.

[0072] The compression of the gas refrigerant to obtain the refrigerant can be understood as passing the gas refrigerant into the compressor 1012 for compression to obtain the refrigerant.

[0073] The condensation of the refrigerant to obtain the first liquid can be understood as passing the refrigerant into the condenser 1011 for condensation to obtain the first liquid.

[0074] In an alternative embodiment of the present application, a third solenoid valve 109 is provided in the sixth pipeline 116; a fourth solenoid valve 1010 is provided in the seventh pipeline; the control component 108 is electrically connected to the first solenoid valve 106, the second solenoid valve 107, the third solenoid valve 109, and the fourth solenoid valve 1010 respectively;

[0075] The control component 108 is configured to control the opening of the first electronic expansion valve 104, the opening of the second electronic expansion valve 105 as required, the opening of the first solenoid valve 106, the opening of the second solenoid valve 107, the closing of the third solenoid valve 109, and the closing of the fourth solenoid valve 1010 in the case of the air conditioner dehumidification heating mode.

[0076] It should be noted that the third solenoid valve 109 can be determined according to the actual situation and is not limited herein. As an example, the third solenoid valve 109 can also be denoted as solenoid valve 3; the fourth solenoid valve 1010 can also be determined according to the actual situation and is not limited herein. As an example, the fourth solenoid valve 1010 can also be denoted as solenoid valve 4.

[0077] The control component 108 can be determined according to the actual situation and is not limited herein. As an example, the control component 108 can be a controller.

[0078] In practical applications, the control component 108 can be a controller. In the case of the air conditioner in the dehumidification and heating mode, the controller powers on the solenoid valves 106 and 107, closes the solenoid valves 109 and 1010, keeps the electronic expansion valve 104 fully open, and keeps the electronic expansion valve 105 under demand control. The high-temperature and high-pressure liquid coming out of the condenser is divided into two paths. One path enters the evaporator 1022 through the electronic expansion valve 105 for refrigeration, and the other path directly enters the first part 1021 of the evaporator to heat the cold air blown out by the evaporator 1022, ensuring that the air temperature is within a suitable range, and at the same time achieving the effects of refrigeration and dehumidification. That is, by cooling through the evaporator 1022 and heating through the evaporator 1021, it is possible to achieve light-load dehumidification and even large dehumidification capacity output under zero load, effectively avoiding the problem of insufficient dehumidification in existing systems with moderate refrigeration, and also avoiding the problem of excessive refrigeration in systems with moderate dehumidification. The two paths of refrigerant enter the ejector 103 to form a medium-temperature and medium-pressure mixed refrigerant, and finally enter the gas-liquid separator 103. Subsequently, the gaseous refrigerant enters the compressor to complete the cycle. As an example, the cooling / heating control can be carried out according to the final outlet air temperature. Since the electronic expansion valve 104 is fully open, it means that the output of the actual heating section is certain, and more depends on the cooling output of the evaporator 1022. If the required supply air temperature is 18 degrees and the heating is constant, to output a larger amount of cold, the opening degree of the electronic expansion valve 105 is adjusted, then the cold quantity becomes larger and the cooling quantity becomes larger.

[0079] In an alternative embodiment of the present application, the control component 108 is further configured to control the closing of the first solenoid valve 106, the closing of the second solenoid valve 107, the opening of the third solenoid valve 109, and the opening of the fourth solenoid valve 1010 when the air conditioner does not require the dehumidification and heating mode.

[0080] In this embodiment, the control component 108 can be determined according to the actual situation and is not limited herein. As an example, the control component 108 can be a controller.

[0081] In practical applications, when the control component 108 is a controller and the air conditioner does not require dehumidification and heating, the solenoid valves 106 and 107 are closed, and 109 and 1010 are opened, and the reheating coil (the first part 1021 of the evaporator) will not release heat to the air passing through the evaporator.

[0082] In an alternative embodiment of the present application, the system 100 further includes: a check valve 1011; the check valve 1011 is disposed on the fourth pipeline 114 connecting the second evaporator 1022 and the second solenoid valve 107;

[0083] The check valve 1011 is used to enable the second refrigerant in the fourth pipeline 114 to flow unidirectionally.

[0084] In this embodiment, the check valve 1011 can be any check valve, which is not limited here.

[0085] In an alternative embodiment of the present application, the type of the compressor 1012 is a variable-frequency compressor;

[0086] The variable-frequency compressor is used to adjust the frequency according to the required refrigerating capacity; the required refrigerating capacity is related to the load level of the air conditioner; the greater the load level of the air conditioner, the more the required refrigerating capacity; the smaller the load level of the air conditioner, the less the required refrigerating capacity.

[0087] In this embodiment, the type of the compressor 1012 is a variable-frequency compressor, which can be adjusted according to the required refrigerating capacity. When the load is large, the heat is high and the refrigeration demand is large. As the power source of the system, the compressor 1012 needs to provide a higher refrigerating capacity or output frequency to adapt to different load demands until the load is lower than the load range limit that the compressor can achieve.

[0088] In practical applications, the compressor can output variable refrigerating capacity (variable frequency or variable capacity) and be adjusted according to the load condition.

[0089] For the convenience of understanding, an example of the dehumidification and heating control system based on the low-load and high-humidity state of the data center air conditioner is a control system for the low-load and high-humidity of the computer room air conditioner in the data center. The specific content is as follows:

[0090] 1. The working principle of the normal refrigeration mode is as follows:

[0091] After the high-temperature and high-pressure refrigerant comes out of the compressor exhaust port, it first passes through the condenser and becomes a high-pressure and high-temperature liquid. Then, the electronic expansion valves 104 and 105 are opened, the normally open solenoid valves 109 and 1010 remain open, and the normally closed solenoid valves 106 and 107 remain closed. After throttling and pressure reduction by the electronic expansion valve, it enters the evaporator, and then evaporates and dissipates heat to become a low-temperature and low-pressure gas, enters the gas-liquid separator 1013, and then enters the compressor 1012.

[0092] 2. The working principle of the dehumidification and heating mode is as follows:

[0093] When the system needs heating, the controller powers on solenoid valves 106 and 107, closes solenoid valves 109 and 1010, keeps electronic expansion valve 104 fully open, and keeps electronic expansion valve 105 under demand control. The high-temperature and high-pressure liquid coming out of the condenser is divided into two paths. One path enters evaporator 1022 through electronic expansion valve 105 for refrigeration, and the other path directly enters the first part 1021 of the evaporator to heat the cold air blown out by evaporator 1022, ensuring that the air temperature is within a suitable range, and at the same time achieving the effects of refrigeration and dehumidification. That is, by cooling through evaporator 1022 and heating through evaporator 1021, it can achieve light-load dehumidification and even large dehumidification capacity output under zero load, effectively avoiding the problems of insufficient dehumidification with moderate refrigeration and excessive refrigeration with moderate dehumidification in the existing system. The two paths of refrigerant enter ejector 103 to form a medium-temperature and medium-pressure mixed refrigerant, and finally enter gas-liquid separator 103. Subsequently, the gaseous refrigerant enters the compressor to complete the cycle.

[0094] When reheating is not required, solenoid valves 106 and 107 are closed, and 109 and 1010 are opened. Then the reheating coil (the first part 1021 of the evaporator) will not release heat to the air passing through the evaporator. The compressor can have variable refrigeration capacity output (frequency conversion or variable capacity) and be adjusted according to the load condition.

[0095] This air-conditioning device effectively solves the heating compensation requirement for dehumidification, effectively utilizes the heat released on the high-pressure side to balance the drop in the supply air temperature during dehumidification, achieving dehumidification without temperature drop. Moreover, it saves energy. Previously, when switching between the refrigeration and heating modes, the compressor needed to be stopped. If the switching was frequent, it would cause the compressor to start and stop frequently. Now, when heating and refrigerating, there is no need to stop the compressor anymore, only the solenoid valves are opened and closed, which increases the reliability and lifespan of the system and also saves energy.

[0096] The dehumidification and heating control system based on the low-load and high-humidity state of the data center air conditioner provided by the embodiment of the present application adds a power component for gas circulation in the device and a first switch component on the first pipeline. When the control component monitors that the pressure at different time points in the liquid cooling box changes, it controls the first switch component to be in the off state; and determines the change amount of the gas volume in the liquid cooling box based on the pressure at the different time points, and controls the power component to work according to the change amount of the gas volume in the liquid cooling box to adjust the change in the pressure. That is, it precisely controls the pressure change in the heat exchange of the phase change system.

[0097] Based on the above dehumidification and heating control system 100 for the low-load and high-humidity state of the data center air conditioner, the present application also provides a dehumidification and heating control method applied to the above dehumidification and heating control system 100 for the low-load and high-humidity state of the data center air conditioner. Figure 7This is a schematic diagram of the implementation process of a control method for dehumidification and heating based on the low-load and high-humidity state of the data center air conditioner, as shown in Figure 7 The method includes:

[0098] Step S701: Control the first liquid output by the condensation component to be input into the first capacity of the first evaporator through the first pipeline; and control the first liquid output by the condensation component to be input into the second capacity of the second evaporator through the second pipeline; the first capacity is greater than the second capacity; wherein, the first liquid with the first capacity is heated through the first evaporator to obtain the first refrigerant; the high-pressure and high-temperature liquid with the second capacity is cooled through the second evaporator to obtain the second refrigerant.

[0099] Step S702: When the first solenoid valve and the first solenoid valve are in the conducting state, mix the first refrigerant and the second refrigerant to form a mixed refrigerant that meets specific temperature and pressure; the mixed refrigerant is transmitted to the condensation component through the fifth pipeline.

[0100] It should be noted that the control system 100 for dehumidification and heating based on the low-load and high-humidity state of the data center air conditioner is referred to the previous description, wherein both the low load and the high humidity can be determined according to the actual situation and are not limited herein. As an example, the low load can be understood as a load amount lower than 30% of the air conditioner cooling capacity; the high humidity can be understood as a humidity range higher than 70% RH. In practical applications, a load amount lower than 30% of the air conditioner cooling capacity is called a low load; in the data center, generally, a humidity range higher than 70% RH is called high humidity.

[0101] In step S701, the fact that the first capacity is greater than the second capacity can be understood as the opening degree of the first electronic expansion valve being greater than the opening degree of the second electronic expansion valve. As an example, the first electronic expansion valve can remain fully open; the second electronic expansion valve can remain in a demand control state; wherein, the demand control can be understood as the system according to the suction superheat = compressor inlet temperature - evaporator coil outlet temperature, the greater the difference, the greater the suction superheat, the greater the opening degree of the electronic expansion valve, and the greater the demand for refrigerant. The target range value of the suction superheat is generally around 8 - 12k.

[0102] In step S702, the mixed refrigerant with specific temperature and pressure can be determined according to the actual situation and is not limited herein. As an example, the mixed refrigerant with specific temperature and pressure can be understood as a mixed state refrigerant with medium temperature and medium pressure. In practical applications, the liquid coming out of the condenser is called a high-temperature and high-pressure liquid; the gas coming out of the evaporator is called a low-temperature and low-pressure gas; the medium after mixing the above two is called a mixed state refrigerant with medium temperature and medium pressure.

[0103] In an embodiment of the present application, the first electronic expansion valve is used to control the first liquid output by the condensation component to be input into the first capacity of the first evaporator through the first pipeline; the second electronic expansion valve is used to control the first liquid output by the condensation component to be input into the second capacity of the second evaporator through the second pipeline; wherein, the first liquid with the first capacity is heated by the first evaporator to obtain the first refrigerant; the high-pressure and high-temperature liquid with the second capacity is cooled by the second evaporator to obtain the second refrigerant; the injection component mixes the first refrigerant and the second refrigerant to form a mixed refrigerant that meets specific temperature and pressure conditions when the first solenoid valve and the second solenoid valve are turned on. Heating and cooling no longer require stopping the compressor, but only the opening and closing of the solenoid valves, which improves the reliability and lifespan of the system and saves energy.

[0104] In an alternative embodiment of the present application, the method further includes:

[0105] Sending a first control signal to the first electronic expansion valve, where the first control signal is used to control the opening or closing of the first electronic expansion valve to control the first liquid output by the condensation component to be input into the first capacity of the first evaporator;

[0106] Sending a second control signal to the second electronic expansion valve, where the second control signal is used to control the opening degree or closing of the second electronic expansion valve to control the first liquid output by the condensation component to be input into the second capacity of the second evaporator.

[0107] It should be noted that both the first control signal and the second control signal can be determined according to the actual situation and are not limited herein. As an example, the first control signal and the second control signal can be electrical signals, and the opening degrees of the first electronic expansion valve and the second electronic expansion valve can be controlled respectively according to actual requirements. As an example, the first electronic expansion valve can be kept fully open; the second electronic expansion valve can be kept in a state of being controlled as needed, for example, kept half open.

[0108] The opening degree of the second electronic expansion valve can be determined according to the actual situation and is not limited herein. As an example, the opening degree of the second electronic expansion valve can be semi-conducted, and this semi-conduction can be understood as half open.

[0109] In practical applications, the first electronic expansion valve is kept fully open to enable the first liquid output by the condensation component to be input into the first capacity of the first evaporator, and the second electronic expansion valve can be kept in a state of being controlled as needed to enable the first liquid output by the condensation component to be input into the second capacity of the second evaporator.

[0110] The embodiments of the present application also provide a computer program product, including a computer program, which when executed by a processor implements the steps of the foregoing method embodiments.

[0111] The embodiments of the present application also provide a computer-readable medium, on which a computer program is stored, which when executed by a processor implements the steps of the foregoing method embodiments, and the foregoing storage medium includes: various media such as removable storage devices, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs that can store program codes.

[0112] If the method steps in the foregoing system of the embodiments of the present application are implemented in the form of software function modules and sold or used as independent products, they can also be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the embodiments of the present application, in essence or the part that contributes to the prior art, can be embodied in the form of a software product, and this computer software product is stored in a storage medium. The foregoing storage medium includes: various media such as USB flash drives, external hard drives, read-only memories (ROMs), magnetic disks, or optical discs that can store program codes. In this way, the embodiments of the present application are not limited to any specific combination of hardware and software.

[0113] Those of ordinary skill in the art can understand that all or part of the steps of implementing the foregoing method embodiments can be completed by hardware related to program instructions. The foregoing program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps including the foregoing method embodiments; and the foregoing storage medium includes: various media such as removable storage devices, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs that can store program codes.

[0114] The method disclosed in the foregoing embodiments of the present application can be applied to a processor or implemented by a processor. The processor may be an integrated circuit chip with signal processing capabilities. Combining the steps of the method disclosed in the embodiments of the present application, it can be directly embodied as being completed by a hardware decoding processor, or completed by a combination of hardware and software modules in the decoding processor. The software module may be located in the storage medium, and this storage medium is located in the memory. The processor reads the information in the memory and combines its hardware to complete the steps of the foregoing method.

[0115] As described above, it is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims described above.

Claims

1. A control system for dehumidifying and heating based on the low-load and high-humidity state of the air conditioner in the data center, characterized in that, The system includes: a condensation component, an evaporation component, and an injection component; the evaporation component includes a first evaporator and a second evaporator; the condensation component is connected to the first evaporator through a first pipeline; the condensation component is connected to the second evaporator through a second pipeline; a first electronic expansion valve is provided on the first pipeline; a second electronic expansion valve is provided on the second pipeline; the first evaporator is connected to the injection component through a third pipeline; the second evaporator is connected to the injection component through a fourth pipeline; a first solenoid valve is provided on the third pipeline; a second solenoid valve is provided on the fourth pipeline; the injection component is connected to the condensation component through a fifth pipeline; The first electronic expansion valve is used to control the first capacity of the first liquid output by the condensation component to be input into the first evaporator through the first pipeline; The second electronic expansion valve is used to control the second capacity of the first liquid output by the condensation component to be input into the second evaporator through the second pipeline; the first capacity is greater than the second capacity; Wherein, the first liquid with the first capacity is heated by the first evaporator to obtain a first refrigerant; the high-pressure and high-temperature liquid with the second capacity is cooled by the second evaporator to obtain a second refrigerant; The injection component is used to mix the first refrigerant and the second refrigerant to form a mixed refrigerant that meets specific temperature and pressure conditions when the first solenoid valve and the second solenoid valve are in a conducting state; the mixed refrigerant is transmitted to the condensation component through the fifth pipeline.

2. The system according to claim 1, wherein The system further includes a control component electrically connected to the first electronic expansion valve and the second electronic expansion valve respectively, which is used to send a first control signal to the first electronic expansion valve, and the first control signal is used to control the conduction or closing of the first electronic expansion valve to control the first capacity of the first liquid output by the condensation component to be input into the first evaporator; it is also used to send a second control signal to the second electronic expansion valve, and the second control signal is used to control the conduction or closing of the second electronic expansion valve to control the second capacity of the first liquid output by the condensation component to be input into the second evaporator.

3. The system according to claim 2, wherein The second control signal is also used to control the conduction degree of the second electronic expansion valve to control the second capacity of the first liquid output by the condensation component to be input into the second evaporator.

4. The system according to claim 3, wherein The condensation component includes a condenser, a compressor, and a gas-liquid separator, and the compressor is connected to the condenser and the gas-liquid separator respectively through pipelines; the condenser is connected to the first evaporator through the first pipeline; the condenser is connected to the second evaporator through the second pipeline; the injection component is connected to the gas-liquid separator through the fifth pipeline; the first evaporator is connected to the gas-liquid separator through a sixth pipeline; the second evaporator is connected to the gas-liquid separator through a seventh pipeline; The gas-liquid separator is used to separate the mixed refrigerant into a gas refrigerant and a liquid refrigerant; The compressor is used to compress the gaseous refrigerant to obtain a refrigerant; The condenser is used to condense the refrigerant to obtain the first liquid.

5. The system according to claim 4, characterized in that, A third solenoid valve is provided in the sixth pipeline; a fourth solenoid valve is provided in the seventh pipeline; the control component is electrically connected to the first solenoid valve, the second solenoid valve, the third solenoid valve and the fourth solenoid valve respectively; The control component is used to control the opening of the first electronic expansion valve, the opening of the second electronic expansion valve as required, the opening of the first solenoid valve, the opening of the second solenoid valve, the closing of the third solenoid valve and the closing of the fourth solenoid valve in the case of the air conditioner dehumidification and heating mode.

6. The system according to claim 5, wherein The control component is further used to control the closing of the first solenoid valve, the closing of the second solenoid valve, the opening of the third solenoid valve and the opening of the fourth solenoid valve in the case where the air conditioner does not require the dehumidification and heating mode.

7. The system according to claim 6, wherein The system further includes: a check valve; the check valve is arranged on the fourth pipeline connecting the second evaporator and the second solenoid valve; The check valve is used to enable the second refrigerant in the fourth pipeline to flow unidirectionally.

8. The system according to any one of claims 4-7, characterized in that, The type of the compressor is a variable frequency compressor; The variable frequency compressor is used to adjust the frequency according to the required cooling capacity; the required cooling capacity is related to the load level of the air conditioner; the greater the load level of the air conditioner, the more the required cooling capacity; the smaller the load level of the air conditioner, the less the required cooling capacity.

9. A control method for dehumidifying and heating based on the low-load and high-humidity state of the air conditioner in the data center, characterized in that, Applied to the control system according to any one of claims 1 to 8; the method includes: Controlling the first liquid output by the condensing component to be input into the first capacity of the first evaporator through the first pipeline; and controlling the first liquid output by the condensing component to be input into the second capacity of the second evaporator through the second pipeline; the first capacity is greater than the second capacity; wherein, the first liquid with the first capacity is heated by the first evaporator to obtain a first refrigerant; the high-pressure and high-temperature liquid with the second capacity is cooled by the second evaporator to obtain a second refrigerant; In the case where the first solenoid valve and the first solenoid valve are in the open state, mixing the first refrigerant and the second refrigerant to form a mixed refrigerant that meets specific temperature and pressure; the mixed refrigerant is transmitted to the condensing component through the fifth pipeline.

10. The method according to claim 9, characterized in that, The method further includes: Sending a first control signal to the first electronic expansion valve, the first control signal being used to control the opening or closing of the first electronic expansion valve to control the first liquid output by the condensing component to be input into the first capacity of the first evaporator; Sending a second control signal to the second electronic expansion valve, the second control signal being used to control the opening degree or closing of the second electronic expansion valve to control the first liquid output by the condensing component to be input into the second capacity of the second evaporator.

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