Machine room air conditioner and control device and method thereof

Abstract

The application discloses a machine room air conditioner and a control device and method thereof. The device comprises: a collection unit configured to obtain a pressure value of a first compressor fluorine system, denoted as a first high-pressure value; obtain a pressure value of a second compressor fluorine system, denoted as a second high-pressure value; and obtain a water outlet temperature of a shell-tube condenser (11); a control unit configured to determine a condensing pressure value of the shell-tube condenser (11) according to the first high-pressure value and the second high-pressure value; and the control unit is further configured to control an adjusting water valve according to the condensing pressure value of the shell-tube condenser (11) and the water outlet temperature of the shell-tube condenser (11). The scheme can improve the unit energy efficiency ratio of the machine room air conditioner by adopting a double fluorine system sharing one condensing shell-tube water cooling system.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of air conditioners, and particularly relates to a computer room air conditioner and a control device and method thereof, and more particularly to a control device and method for a shell-and-tube condenser built in a computer room air conditioner unit, and the computer room air conditioner. BACKGROUND

[0002] Computer room air conditioner products have strict size limit requirements, and the products with optimal performance need to be designed within the maximum size range allowed. Computer room air conditioners are generally divided into fluorine circulation-air cooling series and fluorine circulation-water cooling series in terms of system design, and the shell-and-tube condenser is a design method in the fluorine circulation-water cooling series, which is divided into external and internal types. The external shell-and-tube condenser increases certain material cost and installation cost in engineering installation and the whole machine development process, for example, the pipeline needs to be lengthened, the circuit control board needs to be increased, and the like. Therefore, more and more customers tend to prefer the design scheme of the internal shell-and-tube condenser. However, the internal shell-and-tube condenser will further occupy the internal space of the unit, which is not conducive to the structure assembly and pipeline design of the whole machine, and also affects the air inlet area of the unit, thereby affecting the unit performance and not conducive to improving the unit energy efficiency ratio.

[0003] The above content is only used to assist in understanding the technical solutions of the present application and does not represent the acknowledgement of the above content as prior art. SUMMARY

[0004] The purpose of the present application is to provide a computer room air conditioner and a control device and method thereof, so as to solve the problem that the internal shell-and-tube condenser of the computer room air conditioner affects the air inlet area of the unit and further affects the unit energy efficiency ratio, and to achieve the effect that the unit energy efficiency ratio of the computer room air conditioner can be improved by adopting a double-fluorine system to share one condensing shell-and-tube water cooling system.

[0005] The control device of the computer room air conditioner provided by the present application adopts a double-fluorine system to share one internal shell-and-tube condenser, the double-fluorine system includes a first compressor fluorine system and a second compressor fluorine system, the first compressor fluorine system and the second compressor fluorine system are independently arranged and share the shell-and-tube condenser, the shell-and-tube condenser has a cooling water outlet pipeline, and an adjusting water valve is arranged on the cooling water outlet pipeline of the shell-and-tube condenser, the control device of the computer room air conditioner includes an acquisition unit configured to acquire a pressure value of the first compressor fluorine system, denoted as a first high-pressure value, acquire a pressure value of the second compressor fluorine system, denoted as a second high-pressure value, and acquire the outlet water temperature of the shell-and-tube condenser, and a control unit configured to determine a condensing pressure value of the shell-and-tube condenser according to the first high-pressure value and the second high-pressure value, and control the adjusting water valve according to the condensing pressure value of the shell-and-tube condenser and the outlet water temperature of the shell-and-tube condenser.

[0006] In some embodiments, the first compressor fluorine system comprises: a heat exchanger, a compressor and a throttling element; wherein the refrigerant outlet of the heat exchanger is connected to the suction port of the compressor through a first pipeline; the exhaust port of the compressor is connected to the first refrigerant inlet of the shell-and-tube condenser through a second pipeline; the first refrigerant outlet of the shell-and-tube condenser is connected to the refrigerant inlet of the heat exchanger through a third pipeline; and the throttling element is arranged on the third pipeline.

[0007] In some embodiments, the throttling element comprises: a capillary tube and an electronic expansion valve; and the capillary tube and the electronic expansion valve are arranged in parallel.

[0008] In some embodiments, the first compressor fluorine system further comprises: an electric heater and an EC fan; wherein the electric heater is arranged between the heat exchanger and the EC fan.

[0009] In some embodiments, the first compressor fluorine system further comprises: an electrode humidifier; and the electrode humidifier is arranged between the electric heater and the EC fan.

[0010] In some embodiments, the structure of the second compressor fluorine system is the same as that of the first compressor fluorine system.

[0011] In some embodiments, the first high-pressure value is the pressure value in the pipeline connected to the first refrigerant outlet of the shell-and-tube condenser; the second high-pressure value is the pressure value in the pipeline connected to the second refrigerant outlet of the shell-and-tube condenser; and the outlet water temperature of the shell-and-tube condenser is the temperature in the pipeline connected to the outlet water port of the shell-and-tube condenser.

[0012] In some embodiments, the control unit determines the condensing pressure value of the shell-and-tube condenser based on the first high-pressure value and the second high-pressure value, including: determining whether the first high-pressure value is less than the second high-pressure value; if the first high-pressure value is less than the second high-pressure value, then determining the first high-pressure value as the condensing pressure value of the shell-and-tube condenser when the second high-pressure value is less than a set high-pressure value; determining the second high-pressure value as the condensing pressure value of the shell-and-tube condenser when the second high-pressure value is greater than or equal to the set high-pressure value; if the first high-pressure value is greater than or equal to the second high-pressure value, then determining the second high-pressure value as the condensing pressure value of the shell-and-tube condenser when the first high-pressure value is less than the set high-pressure value; and determining the first high-pressure value as the condensing pressure value of the shell-and-tube condenser when the first high-pressure value is greater than or equal to the set high-pressure value.

[0013] In some embodiments, the control unit controls the regulating water valve based on the condensing pressure value of the shell-and-tube condenser and the outlet water temperature of the shell-and-tube condenser, including: controlling the regulating water valve to perform a reset action after the computer room air conditioner is powered on; and determining the initial opening degree of the regulating water valve based on the cooling water inlet temperature of the shell-and-tube condenser after the computer room air conditioner has been powered on for a set power-on time. Specifically, the control unit determines the initial opening degree of the regulating water valve based on the cooling water inlet temperature of the shell-and-tube condenser, including: determining the initial opening degree of the regulating water valve as a first opening degree when the cooling water inlet temperature of the shell-and-tube condenser is less than the set inlet temperature or when the sensor for the cooling water inlet temperature of the shell-and-tube condenser is faulty; and determining the initial opening degree of the regulating water valve as a second opening degree when the cooling water inlet temperature of the shell-and-tube condenser is greater than or equal to the set inlet temperature and the sensor for the cooling water inlet temperature of the shell-and-tube condenser is not faulty; the second opening degree is greater than the first opening degree.

[0014] In some embodiments, the control unit controls the regulating water valve according to the condensing pressure value of the shell-and-tube condenser and the outlet water temperature of the shell-and-tube condenser, and further comprises: in the case that the compressor of the machine room air conditioner has an opening requirement, controlling the cooling water pump of the machine room air conditioner to be turned on, and controlling the regulating water valve to be fully opened; after setting an opening duration, controlling the opening degree of the regulating water valve to a predetermined initial opening degree; determining whether the condensing pressure value is less than a set condensing pressure value; if the condensing pressure value is less than the set condensing pressure value, controlling the opening degree of the regulating water valve to remain at the initial opening degree within a set running time of the compressor being turned on; and then controlling the regulating water valve according to the condensing pressure value and the outlet water temperature; if the condensing pressure value is greater than or equal to the set condensing pressure value or the compressor is turned on for the set running time, controlling the regulating water valve according to the condensing pressure value and the outlet water temperature.

[0015] In some embodiments, the control unit controls the regulating water valve according to the condensing pressure value and the outlet water temperature, and comprises: if the condensing pressure value is less than a first set pressure value, in the case that the sensor of the outlet water temperature fails, controlling the regulating water valve to be closed according to a first set regulating period; in the case that the sensor of the outlet water temperature does not fail, if the outlet water temperature is less than a set outlet water temperature, controlling the regulating water valve to be closed according to the first set regulating period, and if the outlet water temperature is greater than or equal to the set outlet water temperature, controlling the regulating water valve to be opened according to the first set regulating period; if the condensing pressure value is greater than or equal to the first set pressure value and less than a second set pressure value, in the case that the sensor of the outlet water temperature fails, controlling the opening degree of the regulating water valve to remain unchanged; in the case that the sensor of the outlet water temperature does not fail, if the outlet water temperature is less than the set outlet water temperature, controlling the opening degree of the regulating water valve to remain unchanged, and if the outlet water temperature is greater than or equal to the set outlet water temperature, controlling the regulating water valve to be opened according to the first set regulating period.

[0016] If the condensing pressure value is greater than or equal to the second set pressure value and less than the third set pressure value, the regulating water valve is controlled to open in the first set adjustment period in the case of the sensor of the outlet water temperature being faulty; and in the case of the sensor of the outlet water temperature not being faulty, the regulating water valve is controlled to open in the first set adjustment period if the outlet water temperature is less than the set outlet water temperature, the regulating water valve is controlled to open in the first set adjustment period and the opening degree is increased if the outlet water temperature is greater than or equal to the set outlet water temperature; if the condensing pressure value is greater than or equal to the third set pressure value and less than the fourth set pressure value, the regulating water valve is controlled to open in the second set period; if the condensing pressure value is greater than or equal to the fourth set pressure value and less than the fifth set pressure value, the regulating water valve is controlled to open in the third set period, and the frequency increasing degree of the compressor is controlled to be not greater than the set degree; if the condensing pressure value is greater than or equal to the fifth set pressure value and less than the sixth set pressure value, the regulating water valve is controlled to close in the third set period, and the frequency of the compressor is controlled to decrease; and if the condensing pressure value is greater than or equal to the fifth set pressure value and greater than or equal to the sixth set pressure value, the regulating water valve is controlled to open completely, and the frequency increasing degree of the compressor is controlled to be not greater than the set degree.

[0017] In order to achieve the above object, the present application provides a control device of a computer room air conditioner.

[0018] In order to achieve the above object, the present application provides a control device of a computer room air conditioner.

[0019] In some embodiments, determining the condensing pressure value of the shell-and-tube condenser according to the first high-pressure value and the second high-pressure value comprises: determining whether the first high-pressure value is less than the second high-pressure value; if the first high-pressure value is less than the second high-pressure value, determining the first high-pressure value as the condensing pressure value of the shell-and-tube condenser if the second high-pressure value is less than a set high-pressure value; determining the second high-pressure value as the condensing pressure value of the shell-and-tube condenser if the second high-pressure value is greater than or equal to a set high-pressure value; if the first high-pressure value is greater than or equal to the second high-pressure value, determining the second high-pressure value as the condensing pressure value of the shell-and-tube condenser if the first high-pressure value is less than a set high-pressure value; determining the first high-pressure value as the condensing pressure value of the shell-and-tube condenser if the first high-pressure value is greater than or equal to a set high-pressure value.

[0020] In some embodiments, controlling the regulating water valve according to the condensing pressure value of the shell-and-tube condenser and the outlet water temperature of the shell-and-tube condenser comprises: controlling the regulating water valve to perform a reset action after the machine room air conditioner is powered on; determining an initial opening degree of the regulating water valve according to the cooling water inlet temperature of the shell-and-tube condenser after the machine room air conditioner is powered on for a set power-on duration; wherein determining the initial opening degree of the regulating water valve according to the cooling water inlet temperature of the shell-and-tube condenser comprises: determining the initial opening degree of the regulating water valve as a first opening degree if the cooling water inlet temperature of the shell-and-tube condenser is less than a set inlet temperature or a sensor for the cooling water inlet temperature of the shell-and-tube condenser is faulty; determining the initial opening degree of the regulating water valve as a second opening degree if the cooling water inlet temperature of the shell-and-tube condenser is greater than or equal to a set inlet temperature and the sensor for the cooling water inlet temperature of the shell-and-tube condenser is not faulty; the second opening degree being greater than the first opening degree.

[0021] In some embodiments, the control of the regulating water valve according to the condensing pressure value of the shell-and-tube condenser and the outlet water temperature of the shell-and-tube condenser further comprises: in the case that the compressor of the machine room air conditioner has an opening demand, controlling the cooling water pump of the machine room air conditioner to be turned on, and controlling the regulating water valve to be fully opened; after setting an opening duration, controlling the opening degree of the regulating water valve to a predetermined initial opening degree; determining whether the condensing pressure value is less than a set condensing pressure value; if the condensing pressure value is less than the set condensing pressure value, controlling the opening degree of the regulating water valve to remain at the initial opening degree within a set running time of the compressor being turned on; and then controlling the regulating water valve according to the condensing pressure value and the outlet water temperature; if the condensing pressure value is greater than or equal to the set condensing pressure value or the compressor is turned on for the set running time, controlling the regulating water valve according to the condensing pressure value and the outlet water temperature.

[0022] In some embodiments, the adjusting water valve is controlled according to the condensing pressure value and the outlet water temperature, including: if the condensing pressure value is less than a first set pressure value, in the case that the sensor of the outlet water temperature is faulty, the adjusting water valve is controlled to be closed in a first set adjusting period; in the case that the sensor of the outlet water temperature is not faulty, if the outlet water temperature is less than a set outlet water temperature, the adjusting water valve is controlled to be closed in the first set adjusting period, if the outlet water temperature is greater than or equal to the set outlet water temperature, the adjusting water valve is controlled to be opened in the first set adjusting period; if the condensing pressure value is greater than or equal to the first set pressure value and less than a second set pressure value, in the case that the sensor of the outlet water temperature is faulty, the opening degree of the adjusting water valve is controlled to be unchanged; in the case that the sensor of the outlet water temperature is not faulty, if the outlet water temperature is less than the set outlet water temperature, the opening degree of the adjusting water valve is controlled to be unchanged, if the outlet water temperature is greater than or equal to the set outlet water temperature, the adjusting water valve is controlled to be opened in the first set adjusting period; if the condensing pressure value is greater than or equal to the second set pressure value and less than a third set pressure value, in the case that the sensor of the outlet water temperature is faulty, the adjusting water valve is controlled to be opened in the first set adjusting period; in the case that the sensor of the outlet water temperature is not faulty, if the outlet water temperature is less than the set outlet water temperature, the adjusting water valve is controlled to be opened in the first set adjusting period, if the outlet water temperature is greater than or equal to the set outlet water temperature, the adjusting water valve is controlled to be opened in the first set adjusting period and the opening degree is increased; if the condensing pressure value is greater than or equal to the third set pressure value and less than a fourth set pressure value, the adjusting water valve is controlled to be opened in a second set period; if the condensing pressure value is greater than or equal to the fourth set pressure value and less than a fifth set pressure value, the adjusting water valve is controlled to be opened in a third set period, and the frequency increasing amplitude of the compressor is controlled to be not greater than a set amplitude; if the condensing pressure value is greater than or equal to the fifth set pressure value and less than a sixth set pressure value, the adjusting water valve is controlled to be closed in the third set period, and the frequency decreasing of the compressor is controlled; if the condensing pressure value is greater than or equal to the fifth set pressure value and greater than or equal to the sixth set pressure value, the adjusting water valve is controlled to be fully opened, and the frequency increasing amplitude of the compressor is controlled to be not greater than the set amplitude.

[0023] Therefore, by the scheme of the present application, the condensing pressure of two independent compressor fluorine systems is collected, the opening degree of the adjusting water valve is controlled according to the range of the condensing pressure and the outlet water temperature of the shell and tube condenser, and the shell and tube condenser shared by the two independent compressor fluorine systems is controlled to be stable, so that the energy efficiency ratio of the air conditioning unit in the machine room can be improved by using a double fluorine system shared with a condensing shell and tube water cooling system.

[0024] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art upon examination of the following or can be learned by practice of the application.

[0025] The technical solutions of the present application are described in further detail below with reference to the accompanying drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 Structure diagram of an embodiment of the control device of the computer room air conditioner of the present application;

[0027] Figure 2 Flow diagram of an embodiment of the control method of the computer room air conditioner of the present application;

[0028] Figure 3 Flow diagram of an embodiment of the method of determining the initial opening degree of the regulating water valve before the computer room air conditioner is turned on in the present application;

[0029] Figure 4 Flow diagram of an embodiment of the method of determining the initial opening degree of the regulating water valve before the computer room air conditioner is turned on in the present application;

[0030] Figure 5 Structure diagram of an embodiment of the external shell-tube condenser in the related solutions;

[0031] Figure 6 Structure diagram of an embodiment of the whole system of the computer room air conditioner;

[0032] Figure 7 Flow diagram of an embodiment of the condensing pressure value determination method;

[0033] Figure 8 Flow diagram of an embodiment of the two-way regulating valve control method.

[0034] In the embodiments of the present application, the reference signs are as follows in combination with the accompanying drawings:

[0035] 11 - shell-tube condenser; 21 - first evaporator; 22 - second evaporator; 3 - electric heater; 4 - electrode humidifier; 5 - EC fan; 6 - compressor; 61 - compressor heating belt; 62 - high-voltage switch; 63 - two-way regulating water valve; 64 - water flow switch; 7 - electronic expansion valve; 71 - electronic expansion valve coil; 8 - capillary tube (i.e. parallel capillary tube); 81 - exhaust temperature-sensing bag; 82 - low-pressure sensor; 83 - evaporator out-pipe temperature-sensing bag; 84 - evaporator in-pipe temperature-sensing bag; 85 - high-pressure sensor; 86 - water outlet temperature-sensing bag; 87 - water inlet temperature-sensing bag; 88 - supply air temperature and humidity sensor; 89 - water leakage sensing line; 9 - return air temperature and humidity sensor; 91 - air pressure sensor. DETAILED DESCRIPTION

[0036] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described clearly and completely below in conjunction with the embodiments of the present application and corresponding 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 skilled in the art without creative work fall within the protection scope of the present application.

[0037] According to the embodiments of the present application, a control device of a computer room air conditioner is provided. Referring to Figure 1 the structural schematic diagram of an embodiment of the device of the present application is shown. The computer room air conditioner adopts a double-fluorine system sharing an embedded shell-and-tube condenser 11. The double-fluorine system includes a first compressor fluorine system and a second compressor fluorine system. The first compressor fluorine system is system 1, and the second compressor fluorine system is system 2. The first compressor fluorine system and the second compressor fluorine system are independently arranged, and share the shell-and-tube condenser 11. The shell-and-tube condenser 11 has a cooling water outlet pipeline, and a regulating water valve, such as a two-way regulating water valve 63, is arranged on the cooling water outlet pipeline of the shell-and-tube condenser 11.

[0038] In the scheme of the present application, the computer room air conditioner can be a bottom air supply unit, and the air outlet can be arranged at the bottom.

[0039] Figure 5 the structural schematic diagram of an embodiment of the external shell-and-tube condenser in the related scheme is shown. In the external shell-and-tube condenser as shown in Figure 5 The condensing inlet pipe is connected to the condensing inlet end of the shell-and-tube condenser. A compressor exhaust temperature bulb is arranged on the condensing inlet pipe. The water outlet of the shell-and-tube condenser is connected to the water inlet end of the cooling tower through the cooling water outlet pipe. A water outlet temperature bulb and a flow regulating valve are arranged on the cooling water outlet pipe. The water outlet end of the cooling tower is connected to the water inlet of the shell-and-tube condenser through the cooling water inlet pipe. A water pump, a water flow switch and a water inlet temperature bulb are arranged on the cooling water inlet pipe. The condensing outlet end of the shell-and-tube condenser is connected to the condensing outlet pipe. A condensing pressure sensor is arranged on the condensing outlet pipe.

[0040] In the related scheme, the external shell-and-tube condenser is generally one-to-one controlled by the fluorine circulation system and the water circulation system, such as the example shown in Figure 5 .

[0041] The scheme of the present application proposes a brand-new reliable low-cost built-in shell tube condenser control scheme. Compared with the one-to-one control system design of the fluorine circulation system and the water circulation system, the double fluorine system shares one built-in shell tube condenser, can meet the strict size limitation of the unit under specific cooling capacity conditions, is more conducive to improving the unit energy efficiency ratio, and reduces the design cost. Thus, less copper pipe is used, installation cost is saved, installation is convenient in engineering, pipeline is reduced, water system resistance is reduced, the unit energy efficiency ratio is improved, two-way regulating valves and other components are reduced, and the development cost of the whole machine is reduced.

[0042] Specifically, in the scheme of the present application, two independent compressor fluorine systems share one shell tube condenser, the opening degree of the throttle valve is controlled through certain condensing pressure collection logic and in combination with the outlet water temperature. The condensing pressures of the two independent compressor fluorine systems are collected and valued according to certain conditions, and then the corresponding throttle valve opening degree control criteria are formulated according to the range in which the condensing pressure values are located, so as to realize the stable operation of the double system sharing one shell tube condenser.

[0043] In some embodiments, the first compressor fluorine system comprises a heat exchanger (such as a first evaporator 21), a compressor 6, and a throttling element.

[0044] The refrigerant outlet of the heat exchanger is connected to the suction port of the compressor 6 through a first pipeline. The exhaust port of the compressor 6 is connected to the first refrigerant inlet of the shell tube condenser 11 through a second pipeline. The first refrigerant outlet of the shell tube condenser 11 is connected to the refrigerant inlet of the heat exchanger through a third pipeline.

[0045] The throttling element is arranged on the third pipeline.

[0046] In some embodiments, the throttling element comprises a capillary tube 8 and an electronic expansion valve 7. The capillary tube 8 and the electronic expansion valve 7 are arranged in parallel.

[0047] In some embodiments, the first compressor fluorine system further comprises an electric heater 3 and an EC fan 5. The electric heater 3 is arranged between the heat exchanger and the EC fan 5.

[0048] In some embodiments, the first compressor fluorine system further comprises an electrode humidifier 4. The electrode humidifier 4 is arranged between the electric heater 3 and the EC fan 5.

[0049] In some embodiments, the structure of the second compressor fluorine system is the same as that of the first compressor fluorine system.

[0050] Figure 6This is a schematic diagram of the structure of one embodiment of a computer room air conditioning system. Figure 6 As shown, the complete system of the computer room air conditioner includes: shell and tube condenser 11, first evaporator 21, second evaporator 22, electric heater 3, electrode humidifier 4, EC fan 5, compressor 6, compressor heating belt 61, high pressure switch 62, two-way regulating water valve 63, water flow switch 64, electronic expansion valve 7, electronic expansion valve coil 71, capillary tube (i.e., parallel capillary tube) 8, exhaust temperature sensor 81, low pressure sensor 82, evaporator outlet pipe temperature sensor 83, evaporator inlet pipe temperature sensor 84, high pressure sensor 85, water outlet temperature sensor 86, water inlet temperature sensor 87, supply air temperature and humidity sensor 88, water leakage sensing wire 89, return air temperature and humidity sensor 9, and wind pressure sensor 91.

[0051] In the two compressor refrigerant systems, System 1 includes: a first evaporator 21, an electric heater 3, an electrode humidifier 4, an EC fan 5, a compressor 6, a compressor heating belt 61, a high-pressure switch 62, an electronic expansion valve 7, an electronic expansion valve coil 71, a capillary tube (i.e., a parallel capillary tube) 8, an exhaust temperature sensor 81, a low-pressure sensor 82, an evaporator outlet temperature sensor 83, an evaporator inlet temperature sensor 84, a high-pressure sensor 85, a supply air temperature and humidity sensor 88, a water leakage sensing wire 89, a return air temperature and humidity sensor 9, and a wind pressure sensor 91. System 2 includes: a second evaporator 22, an electric heater 3, an EC fan 5, a compressor 6, a compressor heating belt 61, a high-pressure switch 62, an electronic expansion valve 7, an electronic expansion valve coil 71, a capillary tube (i.e., a parallel capillary tube) 8, an exhaust temperature sensor 81, a low-pressure sensor 82, an evaporator outlet pipe temperature sensor 83, an evaporator inlet pipe temperature sensor 84, a high-pressure sensor 85, a supply air temperature and humidity sensor 88, a water leakage sensing wire 89, a return air temperature and humidity sensor 9, and a wind pressure sensor 91.

[0052] In system 1, the first end of the first evaporator 21 is connected to the inlet of the compressor 6 via a first pipeline. An evaporator outlet temperature sensor 83 and a low-pressure sensor 82 are installed on the first pipeline. The exhaust port of the compressor 6 is connected to the first inlet of the shell-and-tube condenser 11 via a second pipeline. An exhaust temperature sensor 81 and a high-pressure switch 62 are installed on the second pipeline between the exhaust port of the compressor 6 and the first inlet of the shell-and-tube condenser 11. The first outlet of the shell-and-tube condenser 11 is connected to the second end of the second evaporator 22 via a third pipeline. A high-pressure sensor 85, a capillary tube 8, and an evaporator inlet temperature sensor 84 are installed in the third pipeline between the first outlet of the shell-and-tube condenser 11 and the second end of the second evaporator 22. An electronic expansion valve 7 is connected in parallel with the capillary tube 8. The electronic expansion valve 7 has an electronic expansion valve coil 71.

[0053] In System 1, except for the electrode humidifier 4, the structure of System 1 is the same as that of System 2.

[0054] A shell and tube condenser 11 is connected to the system 1 and the system 2 through pipes. A cooling water outlet pipe and a cooling water inlet pipe are further provided on the shell and tube condenser 11. A water outlet temperature sensing bulb 86 and a two-way regulating water valve 63 are provided on the cooling water outlet pipe. A water flow switch 64 and a water inlet temperature sensing bulb 87 are provided on the cooling water inlet pipe.

[0055] In Figure 6 In the system block diagram of the unit control shown, the two compressor fluorine systems share one shell and tube condenser 11, and the shell and tube condenser 11 controls the cooling water flow rate through a two-way regulating valve (i.e. the two-way regulating water valve 63) to determine the heat exchange capacity of the shell and tube condenser 11. Generally, under a certain stable working condition, the increase of the operating frequency of the compressor 6 will cause the system condensing pressure (i.e. the pressure detected by the high pressure sensor 85) to rise, and at this time, the cooling water flow rate needs to be increased to ensure the heat exchange amount and thus maintain the stable operation of the system, so as to avoid the high pressure protection and shutdown. When the cooling water temperature is relatively high, the heat exchange effect will be poor, and at this time, the water flow rate also needs to be increased to ensure the heat exchange amount and thus maintain the stable operation of the system, so as to avoid the high pressure protection and shutdown.

[0056] The control device of the machine room air conditioner comprises a collection unit and a control unit.

[0057] The collection unit is configured to obtain a pressure value of the first compressor fluorine system, denoted as a first high pressure value, such as a first high pressure value P1. Obtain a pressure value of the second compressor fluorine system, denoted as a second high pressure value, such as a second high pressure value P2. And obtain the outlet water temperature of the shell and tube condenser 11, specifically the outlet water temperature at the cooling water outlet of the shell and tube condenser 11, such as outlet water temperature Tout.

[0058] The first high pressure value is the pressure value in the pipe connected to the first refrigerant outlet of the shell and tube condenser 11.

[0059] The second high pressure value is the pressure value in the pipe connected to the second refrigerant outlet of the shell and tube condenser 11. The second refrigerant outlet of the shell and tube condenser 11 is connected to the second compressor fluorine system.

[0060] The outlet water temperature of the shell and tube condenser 11 is the temperature in the pipe connected to the cooling water outlet of the shell and tube condenser 11.

[0061] The control unit is configured to determine the condensing pressure value of the shell and tube condenser 11, such as condensing pressure Px, according to the first high pressure value and the second high pressure value.

[0062] In some embodiments, the control unit determines the condensing pressure value of the shell-and-tube condenser 11, such as the condensing pressure Px, according to the first high-pressure pressure value and the second high-pressure pressure value, including:

[0063] The control unit is further configured to determine whether the first high-pressure pressure value is less than the second high-pressure pressure value.

[0064] The control unit is further configured to, if the first high-pressure pressure value is less than the second high-pressure pressure value, determine the first high-pressure pressure value as the condensing pressure value of the shell-and-tube condenser 11 if the second high-pressure pressure value is less than a set high-pressure pressure value. Determine the second high-pressure pressure value as the condensing pressure value of the shell-and-tube condenser 11 if the second high-pressure pressure value is greater than or equal to the set high-pressure pressure value.

[0065] The control unit is further configured to, if the first high-pressure pressure value is greater than or equal to the second high-pressure pressure value, determine the second high-pressure pressure value as the condensing pressure value of the shell-and-tube condenser 11 if the first high-pressure pressure value is less than a set high-pressure pressure value. Determine the first high-pressure pressure value as the condensing pressure value of the shell-and-tube condenser 11 if the first high-pressure pressure value is greater than or equal to the set high-pressure pressure value.

[0066] Figure 7 Flowchart of an embodiment of the condensing pressure determination method. As shown in Figure 7 The condensing pressure determination method includes:

[0067] Step 11, the microcontroller acquires the pressure values of the high-pressure sensors 85 of the two fluorine systems to obtain the first high-pressure pressure value P1 and the second high-pressure pressure value P2. The two fluorine systems include: the first fluorine system such as system 1 and the second fluorine system such as system 2. The pressure value of system 1 is the first high-pressure pressure value P1, and the pressure value of system 2 is the second high-pressure pressure value P2.

[0068] Step 12, determine whether the first high-pressure pressure value P1 of system 1 is less than the second high-pressure pressure value P2 of system 2: if yes, execute step 21. Otherwise, execute step 31.

[0069] Step 21, determine whether the second high-pressure pressure value P2 of system 2 is less than a set pressure value such as 3000KPa: if yes, execute step 22. Otherwise, execute step 23.

[0070] Step 22, set the control pressure value Px of the condensing shell tube (i.e. the shell-and-tube condenser 11) to the first high-pressure pressure value P1.

[0071] Step 23, judge whether the first high pressure value P1 of system 1 is greater than the set pressure value such as 3000KPa: if yes, execute step 24. Otherwise, execute step 25.

[0072] Step 24, make the control pressure value Px of the condensing shell tube (i.e. shell tube condenser 11) take the second high pressure value P2.

[0073] Step 25, make the control pressure value Px of the condensing shell tube (i.e. shell tube condenser 11) take the second high pressure value P2.

[0074] Wherein, the principle of pressure value is that when the first high pressure value and the second high pressure value are both less than the set pressure value, the smaller pressure value of the two is taken as the control pressure PX; when at least one of the first high pressure value and the second high pressure value is higher than the set pressure value, the larger pressure value of the two is taken as the control pressure PX.

[0075] Step 31, judge whether the first high pressure value P1 of system 1 is less than the set pressure value such as 3000KPa: if yes, execute step 32. Otherwise, execute step 33.

[0076] Step 32, make the control pressure value Px of the condensing shell tube (i.e. shell tube condenser 11) take the second high pressure value P2.

[0077] Step 33, judge whether the second high pressure value P2 of system 2 is greater than the set pressure value such as 3000KPa: if yes, execute step 34. Otherwise, execute step 35.

[0078] Step 34, make the control pressure value Px of the condensing shell tube (i.e. shell tube condenser 11) take the first high pressure value P1.

[0079] Step 35, make the control pressure value Px of the condensing shell tube (i.e. shell tube condenser 11) take the first high pressure value P1.

[0080] In Figure 7 In the example shown, the condensing pressure Px, i.e. the control pressure value Px of the shell tube condenser 11, refers to the pressure detected by the high pressure sensor 85. The selection of the condensing pressure Px reference value will be used for the control of the two-way regulating valve (i.e. the cooling water valve such as the two-way regulating water valve 63).

[0081] The scheme of the application proposes a new control method suitable for multiple independent compressor fluorine systems sharing a condensing shell tube for heat exchange. By taking the condensing pressure value of multiple systems, calculating according to the method described in the scheme of the application, combining the condenser outlet water temperature, and controlling the opening degree of the throttling valve according to certain rules, the purpose of stable operation of multiple systems is achieved.

[0082] The control unit is further configured to control the regulating water valve according to the condensing pressure value of the shell-and-tube condenser 11 and the outlet water temperature of the shell-and-tube condenser 11, such as the two-way regulating water valve 63. Specifically, the control logic of the two-way regulating valve of the machine room air conditioner is determined according to the condensing pressure of the shell-and-tube condenser 11 and the outlet water temperature of the shell-and-tube condenser 11, and the two-way regulating valve is controlled according to the determined control logic to achieve that the double-fluorine system shares one condensing shell-and-tube water cooling system, and the cooling water flow is controlled by one two-way regulating valve to balance the heat exchange effect of the two fluorine systems.

[0083] In some embodiments, the control unit controls the regulating water valve according to the condensing pressure value of the shell-and-tube condenser 11 and the outlet water temperature of the shell-and-tube condenser 11, including: determining the initial opening degree of the regulating water valve before the machine room air conditioner is turned on, specifically as follows:

[0084] The control unit is further configured to control the regulating water valve to perform a reset action, i.e., to be fully opened and then fully closed, after the machine room air conditioner is powered on before the compressor 6 of the machine room air conditioner is turned on.

[0085] The control unit is further configured to determine the initial opening degree of the regulating water valve according to the cooling water inlet temperature of the shell-and-tube condenser 11 after the machine room air conditioner is powered on for a power-on duration. The cooling water inlet temperature of the shell-and-tube condenser 11 is the temperature in the pipeline where the cooling water inlet of the shell-and-tube condenser 11 is located.

[0086] The control unit determines the initial opening degree of the regulating water valve according to the cooling water inlet temperature of the shell-and-tube condenser 11, including the following two determination cases:

[0087] The first determination case: the control unit is further configured to determine the initial opening degree of the regulating water valve as a first opening degree in the case that the cooling water inlet temperature of the shell-and-tube condenser 11 is less than a set inlet temperature or the sensor for the cooling water inlet temperature of the shell-and-tube condenser 11 is faulty.

[0088] The second determination case: the control unit is further configured to determine the initial opening degree of the regulating water valve as a second opening degree in the case that the cooling water inlet temperature of the shell-and-tube condenser 11 is greater than or equal to the set inlet temperature and the sensor for the cooling water inlet temperature of the shell-and-tube condenser 11 is not faulty. The second opening degree is greater than the first opening degree.

[0089] Figure 8 The flowchart of an embodiment of the two-way regulating valve control method is shown in FIG. 8. As shown in FIG. 8, the two-way regulating valve control method includes: Figure 8 The two-way regulating valve control method includes:

[0090] Step 41, the unit is powered on, the cooling water valve (such as two-way regulating water valve 63) performs a reset action, first fully open, then fully close.

[0091] That is, after the whole machine is powered on, the reset action of the cooling water valve is first performed, and the cooling water valve is first adjusted to fully open and then adjusted to fully close, so as to check whether the cooling water valve is stuck or faulty.

[0092] Step 42, after the unit is powered on for a set time, such as 2 minutes, the initial opening degree of the cooling water valve is determined according to the cooling water inlet temperature Tin (referring to the temperature value collected by the inlet temperature sensing bulb 87).

[0093] Step 43, it is judged whether the cooling water inlet temperature Tin is less than 25℃ or the cooling water inlet temperature sensor is faulty: if yes, that is, when the cooling water inlet temperature is low or the cooling water inlet temperature sensing bulb is faulty, the initial opening degree of the cooling water valve is fixed at 50%. Otherwise, that is, when the cooling water inlet temperature is high, the initial opening degree of the cooling water valve is fixed at 100%.

[0094] It should be noted that the lower and higher boundary values of the cooling water temperature in the scheme of the present application are 25℃, which is a relatively optimal empirical value obtained through experimental testing, and values near it can also be taken. The initial opening degree of the cooling water valve in different temperature ranges is also a relatively optimal empirical value obtained through experimental testing, and values near it can also be taken. The selection of the boundary value in the scheme of the present application is a relatively optimal empirical value obtained through experimental testing, and will not be described hereinafter.

[0095] In some embodiments, the control unit controls the regulating water valve according to the condensing pressure value of the shell-and-tube condenser 11 and the outlet water temperature of the shell-and-tube condenser 11, and further comprises a process of controlling the regulating water valve after the compressor is turned on, specifically as follows:

[0096] The control unit is specifically configured to control the cooling water pump of the computer room air conditioner to be turned on and control the regulating water valve to be fully opened when there is a turning-on demand of the compressor 6 of the computer room air conditioner, and control the opening degree of the regulating water valve to a predetermined initial opening degree after a set opening duration.

[0097] The control unit is specifically configured to determine whether the condensing pressure value is less than a set condensing pressure value.

[0098] The control unit is specifically configured to control the opening degree of the regulating water valve to remain at the initial opening degree within a set running time of the compressor 6 being turned on if the condensing pressure value is less than the set condensing pressure value. Then, the regulating water valve is controlled according to the condensing pressure value and the outlet water temperature.

[0099] The control unit is further configured to control the regulating water valve according to the condensing pressure value and the outlet water temperature if the condensing pressure value is greater than or equal to a set condensing pressure value or the compressor 6 is started for the set running time.

[0100] As shown in Figure 8 The two-way regulating valve control method further includes:

[0101] Step 44: The unit determines whether the compressor 6 needs to be started according to the actual operation condition. If the compressor 6 needs to be started, step 45 is performed. Otherwise, return to step 43.

[0102] The compressor is started when the ambient temperature is high. For example, the set demand temperature is 25℃, and the actual ambient temperature is 30℃. At this time, the air conditioner needs to start the compressor for refrigeration.

[0103] Step 45: Ensure that the cooling water circulation system is unobstructed, start the cooling water pump, and fully open the cooling water valve. After 30 seconds, adjust the initial opening degree according to the cooling water inlet temperature.

[0104] The initial opening degree is determined according to the inlet temperature, and the cooling water valve is automatically adjusted in opening degree by the control command of the control unit. The opening degree of the cooling water valve is expressed in percentage, and the linear relationship is that full opening represents 100% opening degree, full closing represents 0% opening degree, and half opening represents 50% opening degree.

[0105] For example, when the inlet temperature is less than 15℃, the initial opening degree of the cooling water valve is 25%; when the inlet temperature is between 15℃ and 25℃, the opening degree of the cooling water valve is 50%; when the inlet temperature is between 25℃ and 35℃, the initial opening degree of the cooling water valve is 75%; and when the inlet temperature is greater than 35℃, the initial opening degree of the cooling water valve is 100%. According to the heat exchange principle, the greater the temperature difference between the two media, the better the heat exchange effect. Therefore, when the compressor is started and the refrigerant exchanges heat in the shell-and-tube condenser, the lower the inlet water temperature, the better the heat exchange effect, and the less water is needed. Conversely, when the inlet water temperature is high, the water flow needs to be increased.

[0106] Step 46: After the compressor 6 is started, the opening degree of the cooling water valve is controlled according to the condensing pressure sampling value (i.e., the control pressure value of the shell-and-tube condenser 11) Px.

[0107] The value of Px is extremely critical in the scheme of the present application, see Figure 7Px is calculated based on the pressure values ​​of the two fluorinated systems. When neither exceeds 3000 kPa, Px is the smaller of the two values. When both exceed 3000 kPa, Px is the larger of the two values. When the difference between the two is significant, with one system's condensing pressure greater than 3000 kPa and the other system's condensing pressure less than 3000 kPa, Px is the maximum value.

[0108] In step 46, it is also determined whether the condensing pressure Px is less than 2500 kPa: When the condensing pressure Px is less than 2500 kPa, the compressor 6 maintains its initial opening degree for 1 minute after starting, and then adjusts the cooling water valve opening degree according to the condensing pressure and outlet water temperature after 1 minute. When the condensing pressure Px is greater than or equal to 2500 kPa or after the compressor 6 has been running for 1 minute, the cooling water valve opening degree is directly adjusted according to the condensing pressure and outlet water temperature.

[0109] In some embodiments, the control unit controls the regulating water valve based on the condensation pressure value and the outlet water temperature, including any of the following control scenarios:

[0110] The first control scenario: Specifically, the control unit is further configured to, if the condensing pressure value is less than a first set pressure value, then, in the event of a malfunction in the outlet water temperature sensor, control the regulating water valve to close slightly according to a first set adjustment cycle. If the outlet water temperature sensor is not malfunctioning, then, if the outlet water temperature is less than the set outlet water temperature, control the regulating water valve to close slightly according to the first set adjustment cycle; if the outlet water temperature is greater than or equal to the set outlet water temperature, control the regulating water valve to open slightly according to the first set adjustment cycle. The first set pressure value is, for example, 1900 kPa.

[0111] The second control scenario: Specifically, the control unit is further configured to, if the condensing pressure value is greater than or equal to a first set pressure value and less than a second set pressure value, then, in the event of a malfunction in the outlet water temperature sensor, maintain the opening of the regulating water valve unchanged. If the outlet water temperature sensor is functioning correctly, then, if the outlet water temperature is less than the set outlet water temperature, maintain the opening of the regulating water valve unchanged; if the outlet water temperature is greater than or equal to the set outlet water temperature, then open the regulating water valve more fully according to a first set adjustment cycle. The second set pressure value is, for example, 2300 kPa.

[0112] The third control scenario: Specifically, the control unit is further configured to, if the condensing pressure value is greater than or equal to a second set pressure value and less than a third set pressure value, then, in the event of a malfunction in the outlet water temperature sensor, control the regulating water valve to open wider according to a first set adjustment cycle. If the outlet water temperature sensor is not malfunctioning, then, if the outlet water temperature is less than the set outlet water temperature, control the regulating water valve to open wider according to the first set adjustment cycle; if the outlet water temperature is greater than or equal to the set outlet water temperature, control the regulating water valve to open wider according to the first set adjustment cycle, and increase the opening magnitude. The third set pressure value is, for example, 2600 kPa.

[0113] The fourth control scenario: The control unit is further configured to, if the condensing pressure value is greater than or equal to a third set pressure value and less than a fourth set pressure value, control the regulating water valve to open wider according to a second set cycle. The fourth set pressure value is, for example, 2600 kPa.

[0114] The fifth control scenario: Specifically, the control unit is further configured to, if the condensing pressure value is greater than or equal to the fourth set pressure value and less than the fifth set pressure value, control the regulating water valve to open wider according to the third set cycle, and control the frequency increase of the compressor 6 to not exceed the set range. The fifth set pressure value is, for example, 3300 kPa.

[0115] The sixth control scenario: Specifically, the control unit is further configured to, if the condensing pressure value is greater than or equal to the fifth set pressure value and less than the sixth set pressure value, control the regulating water valve to close less according to the third set cycle, and control the compressor 6 to reduce its frequency. The sixth set pressure value is, for example, 3500 kPa.

[0116] The seventh control scenario: The control unit is further configured to, if the condensing pressure value is greater than or equal to the fifth set pressure value and greater than or equal to the sixth set pressure value, control the regulating water valve to be fully open and control the frequency increase of the compressor 6 to be no greater than the set amplitude.

[0117] like Figure 8 As shown, the two-way regulating valve control method also includes:

[0118] Step 47: When the condensing pressure Px is less than 1900 kPa, if the cooling water outlet temperature sensor malfunctions, the cooling water valve will only close slightly and not open fully, with an adjustment cycle of 1 minute / time.

[0119] It should be noted that the cooling water valve is adjusted by 2% each time, and subsequent details will not be repeated. When the cooling water outlet temperature sensing bag is normal, if the outlet temperature Tout is less than 50℃, the cooling water valve is only closed small and not opened, and the adjustment period is 1 minute / time. If the outlet temperature Tout is greater than or equal to 50℃, the cooling water valve is only opened large and not closed small, and the adjustment period is 1 minute / time. When the condensing pressure Px is not less than 1900KPa, step 48 is executed.

[0120] Step 48, when the condensing pressure Px is less than 2300KPa, if the cooling water outlet temperature sensing bag is faulty, the cooling water valve keeps the opening unchanged. When the cooling water outlet temperature sensing bag is normal, if the outlet temperature Tout is less than 50℃, the cooling water valve keeps the opening unchanged. If the outlet temperature Tout is greater than or equal to 50℃, the cooling water valve is only opened large and not closed small, and the adjustment period is 1 minute / time. When the condensing pressure Px is not less than 2300KPa, step 49 is executed.

[0121] Step 49, when the condensing pressure Px is less than 2600KPa, if the cooling water outlet temperature sensing bag is faulty, the cooling water valve is only opened large and not closed small, and the adjustment period is 1 minute / time. When the cooling water outlet temperature sensing bag is normal, if the outlet temperature Tout is less than 50℃, the cooling water valve is only opened large and not closed small, and the adjustment period is 1 minute / time. If the outlet temperature Tout is greater than or equal to 50℃, the cooling water valve is only opened large and not closed small, and the adjustment amplitude is doubled, and the adjustment period is 1 minute / time. When the condensing pressure Px is not less than 2600KPa, step 50 is executed.

[0122] Step 50, when the condensing pressure Px is less than 3000KPa, the cooling water valve is only opened large and not closed small, and the adjustment period is 30 seconds / time. When the condensing pressure Px is not less than 3000KPa, step 51 is executed.

[0123] Step 51, when the condensing pressure Px is less than 3300KPa, the cooling water valve is only opened large and not closed small, and the adjustment period is 15 seconds / time, and the compressor is not greater than 2HZ each time. When the condensing pressure Px is not less than 3300KPa, step 52 is executed.

[0124] Step 52, when the condensing pressure Px is less than 3500KPa, the cooling water valve is only opened large and not closed small, and the adjustment period is 15 seconds / time, and the compressor is only allowed to reduce frequency and not allowed to increase frequency. When the condensing pressure Px is not less than 3500KPa, step 53 is executed.

[0125] Step 53, when the condensing pressure Px is greater than or equal to 3500KPa, the cooling water valve is adjusted to the full open state (100% open), and the compressor 6 is forced to reduce frequency by 2HZ each time.

[0126] In Figure 8In the shown example, the control of the two-way regulating valve (i.e. the cooling water valve, such as the two-way regulating water valve 63) involves mainly the condensing pressure Px (referring to the pressure detected by the high-pressure sensor) and the outlet water temperature Tout (referring to the temperature detected by the outlet water temperature sensor 86), and the control of the two-way regulating valve is determined by the comprehensive judgment of the two.

[0127] In the above embodiment, the scheme of the present application mainly adopts the condensing pressures of two systems to take values according to the required rules, and then combines the outlet water temperature of the cooling water to regulate the opening amplitude and the regulation period of the cooling water valve. The corresponding rules can also be formulated by using the discharge temperature of the compressor instead of the outlet water temperature of the cooling water, and if there is no condensing pressure, the control of the cooling water valve can also be realized by combining the outlet water temperature of the cooling water and the discharge temperature of the compressor.

[0128] The scheme of the present application proposes a new built-in condensing shell tube control method, formulates a new set of two-way throttling valve control logic, realizes that two fluorine systems share one condensing shell tube water cooling system, and balances the heat exchange effects of the two fluorine systems by controlling the cooling water flow through one two-way regulating valve. This is conducive to reducing the pipeline, reducing the installation cost, reducing the water system resistance, and improving the unit energy efficiency ratio.

[0129] By adopting the technical scheme of the present application, two independent compressor fluorine systems share one shell tube condenser, the condensing pressures of the two independent compressor fluorine systems are collected, the opening of the throttling valve is controlled according to the range in which the condensing pressure is located and in combination with the outlet water temperature of the shell tube condenser, and the two independent compressor fluorine systems share one shell tube condenser to stably operate. Therefore, by adopting the two fluorine systems sharing one condensing shell tube water cooling system, the unit energy efficiency ratio of the machine room air conditioner can be improved.

[0130] According to the embodiment of the present application, a machine room air conditioner corresponding to the control device of the machine room air conditioner is also provided. The machine room air conditioner can include the control device of the machine room air conditioner described above.

[0131] Since the processes and functions realized by the machine room air conditioner of the present embodiment are basically corresponding to the embodiments, principles and examples of the foregoing device, the description of the present embodiment will not be described in detail, and the relevant description in the foregoing embodiments can be referred to, which will not be described herein.

[0132] By adopting the technical scheme of the present application, two independent compressor fluorine systems share one shell tube condenser, the condensing pressures of the two independent compressor fluorine systems are collected, the opening of the throttling valve is controlled according to the range in which the condensing pressure is located and in combination with the outlet water temperature of the shell tube condenser, and the two independent compressor fluorine systems share one shell tube condenser to stably operate. This is conducive to reducing the pipeline, reducing the installation cost, reducing the water system resistance, and improving the unit energy efficiency ratio.

[0133] According to the embodiment of the present application, a control method of a computer room air conditioner corresponding to the computer room air conditioner is also provided, as shown in Figure 2 The flowchart of an embodiment of the method of the present application is shown. The control method of the computer room air conditioner can include steps S110 to S130.

[0134] At step S110, the pressure value of the first compressor fluorine system is obtained, denoted as the first high-pressure value, such as the first high-pressure value P1. The pressure value of the second compressor fluorine system is obtained, denoted as the second high-pressure value, such as the second high-pressure value P2. The outlet water temperature of the shell-and-tube condenser 11 is obtained, specifically the outlet water temperature at the outlet of the cooling water of the shell-and-tube condenser 11, such as the outlet water temperature Tout.

[0135] At step S120, the condensing pressure value of the shell-and-tube condenser 11 is determined according to the first high-pressure value and the second high-pressure value, such as the condensing pressure Px.

[0136] In some embodiments, the specific process of determining the condensing pressure value of the shell-and-tube condenser 11 according to the first high-pressure value and the second high-pressure value at step S120 is described in the following exemplary description.

[0137] The specific process of determining the condensing pressure value of the shell-and-tube condenser 11 according to the first high-pressure value and the second high-pressure value at step S120 is further described below in conjunction with Figure 3 The flowchart of an embodiment of the method of the present application for determining the condensing pressure value of the shell-and-tube condenser 11 is shown. The specific process of determining the condensing pressure value of the shell-and-tube condenser 11 at step S120 includes steps S210 to S230.

[0138] At step S210, it is determined whether the first high-pressure value is less than the second high-pressure value.

[0139] At step S220, if the first high-pressure value is less than the second high-pressure value, the first high-pressure value is determined as the condensing pressure value of the shell-and-tube condenser 11 if the second high-pressure value is less than a set high-pressure value. The second high-pressure value is determined as the condensing pressure value of the shell-and-tube condenser 11 if the first high-pressure value is greater than or equal to the set high-pressure value.

[0140] At step S230, if the first high-pressure value is greater than or equal to the second high-pressure value, the second high-pressure value is determined as the condensing pressure value of the shell-and-tube condenser 11 if the first high-pressure value is less than a set high-pressure value. The first high-pressure value is determined as the condensing pressure value of the shell-and-tube condenser 11 if the first high-pressure value is greater than or equal to the set high-pressure value.

[0141] Figure 7 Flowchart of an embodiment of a condensing pressure valuation method. As shown, the condensing pressure valuation method includes: Figure 7

[0142] Step 11, the unit is powered on, and the microcontroller acquires the pressure values of the high-pressure sensors 85 of the two fluorine systems to obtain a first high-pressure pressure value P1 and a second high-pressure pressure value P2. The two fluorine systems include: a first fluorine system such as system 1 and a second fluorine system such as system 2. The pressure value of system 1 is the first high-pressure pressure value P1, and the pressure value of system 2 is the second high-pressure pressure value P2.

[0143] Step 12, it is judged whether the first high-pressure pressure value P1 of system 1 is less than the second high-pressure pressure value P2 of system 2: if yes, step 21 is executed. Otherwise, step 31 is executed.

[0144] Step 21, it is judged whether the second high-pressure pressure value P2 of system 2 is less than a set pressure value such as 3000 KPa: if yes, step 22 is executed. Otherwise, step 23 is executed.

[0145] Step 22, the control pressure value Px of the condensing shell tube (i.e., the shell tube condenser 11) is valued as the first high-pressure pressure value P1.

[0146] Step 23, it is judged whether the first high-pressure pressure value P1 of system 1 is greater than a set pressure value such as 3000 KPa: if yes, step 24 is executed. Otherwise, step 25 is executed.

[0147] Step 24, the control pressure value Px of the condensing shell tube (i.e., the shell tube condenser 11) is valued as the second high-pressure pressure value P2.

[0148] Step 25, the control pressure value Px of the condensing shell tube (i.e., the shell tube condenser 11) is valued as the second high-pressure pressure value P2.

[0149] Step 31, it is judged whether the first high-pressure pressure value P1 of system 1 is less than a set pressure value such as 3000 KPa: if yes, step 32 is executed. Otherwise, step 33 is executed.

[0150] Step 32, the control pressure value Px of the condensing shell tube (i.e., the shell tube condenser 11) is valued as the second high-pressure pressure value P2.

[0151] Step 33, it is judged whether the second high-pressure pressure value P2 of system 2 is greater than a set pressure value such as 3000 KPa: if yes, step 34 is executed. Otherwise, step 35 is executed.

[0152] Step 34, the control pressure value Px of the condensing shell tube (i.e., the shell tube condenser 11) is valued as the first high-pressure pressure value P1.

[0153] ​Step 35, the control pressure value Px of the condensing shell tube (i.e. the shell tube condenser 11) is set to a first high pressure value P1.

[0154] In Figure 7 the example shown, the condensing pressure Px, i.e. the control pressure value Px of the shell tube condenser 11, refers to the pressure detected by the high pressure sensor 85. The selection of the condensing pressure Px reference value will be used for the control of the two-way regulating valve (i.e. the cooling water valve, such as the two-way regulating water valve 63).

[0155] The scheme of the present application proposes a new control method suitable for multiple independent compressor fluorine systems sharing a condensing shell tube for heat exchange. By setting the condensing pressure values of multiple systems, the method described in the scheme of the present application is used for calculation, combined with the condenser outlet water temperature, and according to certain rules to control the opening of the throttle valve, to achieve the purpose of stable operation of multiple systems.

[0156] At step S130, the regulating water valve, such as the two-way regulating water valve 63, is controlled according to the condensing pressure value of the shell tube condenser 11 and the outlet water temperature of the shell tube condenser 11. Specifically, the control logic of the two-way regulating valve of the machine room air conditioner is determined according to the condensing pressure of the shell tube condenser 11 and the outlet water temperature of the shell tube condenser 11, and the two-way regulating valve is controlled according to the determined control logic, so as to realize that the double fluorine system shares a condensing shell tube water cooling system, and the cooling water flow is controlled by a two-way regulating valve to balance the heat exchange effect of the two fluorine systems.

[0157] Figure 5 The structure diagram of an embodiment of the external shell tube condenser in the related scheme. As shown in Figure 5 In the external shell tube condenser shown in the example, the condensing inlet pipe is connected to the condensing inlet end of the shell tube condenser. The compressor discharge temperature bulb is arranged on the condensing inlet pipe. The outlet of the shell tube condenser is connected to the water inlet end of the cooling tower through the cooling water outlet pipe. The outlet temperature bulb and the flow regulating valve are arranged on the cooling water outlet pipe. The outlet end of the cooling tower is connected to the water inlet of the shell tube condenser through the cooling water inlet pipe. The water pump, water flow switch and water inlet temperature bulb are arranged on the cooling water inlet pipe. The condensing outlet end of the shell tube condenser is connected to the condensing outlet pipe. The condensing pressure sensor is arranged on the condensing outlet pipe.

[0158] In the related scheme, the external shell tube condenser is generally one-to-one controlled by the fluorine circulation system and the water circulation system, as shown in the example. Figure 5

[0159] ​This invention proposes a novel, reliable, and low-cost control scheme for an integrated shell-and-tube condenser. Compared to a one-to-one control system design for the refrigerant and water circulation systems, this scheme utilizes a single integrated shell-and-tube condenser for a dual-refrigerant system. This satisfies the stringent size limitations imposed by specific cooling capacity conditions, improves the unit's energy efficiency ratio, and reduces design costs. Consequently, less copper tubing is used, saving on installation costs. Installation is convenient in engineering. Reduced piping decreases water system resistance, further improving the unit's energy efficiency ratio. The reduction in components such as two-way regulating valves lowers the overall development cost of the unit.

[0160] Specifically, in the present invention, two independent compressor refrigerant systems share a single shell-and-tube condenser. The opening of the throttle valve is controlled by a specific condensing pressure acquisition logic combined with the outlet water temperature. The condensing pressures of the two independent compressor refrigerant systems are acquired according to certain conditions, and then, based on the range of the condensing pressure values ​​and the outlet water temperature, a corresponding throttle valve opening control criterion is established to achieve stable operation of the two systems sharing a single shell-and-tube condenser.

[0161] Figure 6 This is a schematic diagram of the structure of one embodiment of a computer room air conditioning system. Figure 6 As shown, the complete system of the computer room air conditioner includes: shell and tube condenser 11, first evaporator 21, second evaporator 22, electric heater 3, electrode humidifier 4, EC fan 5, compressor 6, compressor heating belt 61, high pressure switch 62, two-way regulating water valve 63, water flow switch 64, electronic expansion valve 7, electronic expansion valve coil 71, capillary tube (i.e., parallel capillary tube) 8, exhaust temperature sensor 81, low pressure sensor 82, evaporator outlet pipe temperature sensor 83, evaporator inlet pipe temperature sensor 84, high pressure sensor 85, water outlet temperature sensor 86, water inlet temperature sensor 87, supply air temperature and humidity sensor 88, water leakage sensing wire 89, return air temperature and humidity sensor 9, and wind pressure sensor 91.

[0162] Two compressor fluorine systems, system 1 includes: the first evaporator 21, electric heater 3, electrode humidifier 4, EC fan 5, compressor 6, compressor heating band 61, high voltage switch 62, electronic expansion valve 7, electronic expansion valve coil 71, capillary tube (i.e. parallel capillary tube) 8, exhaust temperature sensing bag 81, low pressure sensor 82, evaporator out pipe temperature sensing bag 83, evaporator into pipe temperature sensing bag 84, high pressure sensor 85, air supply temperature and humidity sensor 88, water leakage sensing line 89, return air temperature and humidity sensor 9, air pressure sensor 91. System 2 includes: the second evaporator 22, electric heater 3, EC fan 5, compressor 6, compressor heating band 61, high voltage switch 62, electronic expansion valve 7, electronic expansion valve coil 71, capillary tube (i.e. parallel capillary tube) 8, exhaust temperature sensing bag 81, low pressure sensor 82, evaporator out pipe temperature sensing bag 83, evaporator into pipe temperature sensing bag 84, high pressure sensor 85, air supply temperature and humidity sensor 88, water leakage sensing line 89, return air temperature and humidity sensor 9, air pressure sensor 91.

[0163] In system 1, the first end of the first evaporator 21 is connected to the air inlet of the compressor 6 through the first pipeline. The evaporator out pipe temperature sensing bag 83 and the low pressure sensor 82 are arranged on the first pipeline. The air outlet of the compressor 6 is connected to the first inlet end of the shell and tube condenser 11 through the second pipeline. The exhaust temperature sensing bag 81 and the high voltage switch 62 are arranged on the second pipeline between the air outlet of the compressor 6 and the first inlet end of the shell and tube condenser 11. The first outlet end of the shell and tube condenser 11 is connected to the second end of the second evaporator 22 through the third pipeline. The high pressure sensor 85, the capillary tube 8 and the evaporator into pipe temperature sensing bag 84 are arranged in the third pipeline between the first outlet end of the shell and tube condenser 11 and the second end of the second evaporator 22. The electronic expansion valve 7 is arranged in parallel with the capillary tube 8. The electronic expansion valve 7 has the electronic expansion valve coil 71.

[0164] In system 1, except for the electrode humidifier 4, system 1 is the same as system 2.

[0165] The shell and tube condenser 11 is connected to system 1 and system 2 through pipelines respectively. The shell and tube condenser 11 is also provided with a cooling water outlet pipe and a cooling water inlet pipe. The outlet temperature sensing bag 86 and the two-way water regulating valve 63 are arranged on the cooling water outlet pipe. The water flow switch 64 and the inlet temperature sensing bag 87 are arranged on the cooling water inlet pipe.

[0166] In Figure 6The system block diagram of the unit control shows that two compressors fluorine system share a shell and tube condenser 11, and the shell and tube condenser 11 controls the cooling water flow through a two-way regulating valve (i.e. two-way regulating water valve 63) to determine the heat exchange capacity of the shell and tube condenser 11. Generally, under a certain stable working condition, the increase of the operating frequency of the compressor 6 will cause the system condensing pressure (i.e. the pressure detected by the high pressure sensor 85) to rise, at which time the cooling water flow needs to be increased to ensure the heat exchange capacity and thus maintain the stable operation of the system, so as not to cause high pressure protection and shutdown. When the cooling water temperature is relatively high, the heat exchange effect will be poor, at which time the water flow also needs to be increased to ensure the heat exchange capacity and thus maintain the stable operation of the system, so as not to cause high pressure protection and shutdown.

[0167] In some embodiments, the step S130 of controlling the regulating water valve according to the condensing pressure value of the shell and tube condenser 11 and the outlet water temperature of the shell and tube condenser 11 comprises the process of determining the initial opening degree of the regulating water valve before the opening of the machine room air conditioner.

[0168] The following will be combined Figure 4 The embodiment flowchart of the method of the present application shows the specific process of determining the initial opening degree of the regulating water valve before the opening of the machine room air conditioner, which comprises steps S310 and S320.

[0169] Step S310, before the opening of the compressor 6 of the machine room air conditioner, after the power-on of the machine room air conditioner, the regulating water valve is controlled to perform a reset action, i.e. to be fully opened and then fully closed.

[0170] Step S320, after setting the power-on duration after the power-on of the machine room air conditioner, the initial opening degree of the regulating water valve is determined according to the cooling water inlet temperature of the shell and tube condenser 11. The cooling water inlet temperature of the shell and tube condenser 11 is the temperature in the pipeline where the cooling water inlet of the shell and tube condenser 11 is located.

[0171] Among them, the initial opening degree of the regulating water valve is determined according to the cooling water inlet temperature of the shell and tube condenser 11, which includes the following two determination cases:

[0172] The first determination case: in the case that the cooling water inlet temperature of the shell and tube condenser 11 is less than the set inlet temperature or the sensor of the cooling water inlet temperature of the shell and tube condenser 11 fails, the initial opening degree of the regulating water valve is determined as the first opening degree.

[0173] The second determination scenario: If the cooling water inlet temperature of the shell-and-tube condenser 11 is greater than or equal to the set inlet temperature, and the sensor for the cooling water inlet temperature of the shell-and-tube condenser 11 is not faulty, then the initial opening degree of the regulating water valve is determined to be the second opening degree. The second opening degree is greater than the first opening degree.

[0174] Figure 8 This is a schematic flowchart illustrating an embodiment of a two-way control valve control method. Figure 8 As shown, the control method for a two-way regulating valve includes:

[0175] Step 41: When the unit is powered on, the cooling water valve (such as two-way regulating water valve 63) performs a reset action, first fully opening and then fully closing.

[0176] In other words, after the machine is powered on, the cooling water valve is reset first, first adjusted to fully open, and then adjusted to fully closed, to check whether the cooling water valve is stuck or malfunctioning.

[0177] Step 42: After the unit is powered on and the set time is 2 minutes, determine the initial opening of the cooling water valve based on the cooling water inlet temperature Tin (referring to the temperature value collected by the inlet water temperature sensor 87).

[0178] Step 43: Determine if the cooling water inlet temperature (Tin) is less than 25℃, or if the cooling water inlet temperature sensor is faulty. If yes, i.e., the cooling water inlet temperature is low, or the cooling water inlet temperature sensor is faulty, the initial opening of the cooling water valve is fixed at 50%. Otherwise, i.e., the cooling water inlet temperature is high, the initial opening of the cooling water valve is fixed at 100%.

[0179] It should be noted that, in the scheme of this invention, the defining value for the lower and higher cooling water temperatures is 25°C, which is an optimal empirical value obtained from experimental testing; values ​​near this value are acceptable. Similarly, the initial opening degree of the cooling water valve within different temperature ranges is also an optimal empirical value obtained from experimental testing; values ​​near this value are acceptable. The selection of defining values ​​in the scheme of this invention is based on optimal empirical values ​​obtained from experimental testing, and will not be elaborated further below.

[0180] In some embodiments, step S130, which controls the regulating water valve based on the condensing pressure value of the shell-and-tube condenser 11 and the outlet water temperature of the shell-and-tube condenser 11, further includes the process of controlling the regulating water valve after the compressor is turned on.

[0181] The following is combined Figure 5 The schematic diagram shown is a flowchart of an embodiment of the method of the present invention in which the compressor is turned on and the regulating water valve is controlled. The specific process of controlling the regulating water valve after the compressor is turned on is further explained, including steps S410 to S440.

[0182] Step S410, in the case that the compressor 6 of the machine room air conditioner has opening demand, the cooling water pump of the machine room air conditioner is controlled to be opened, and the regulating water valve is controlled to be fully opened, and after setting the opening time length, the opening degree of the regulating water valve is controlled to the initial opening degree.

[0183] Step S420, it is determined whether the condensing pressure value is less than the set condensing pressure value.

[0184] Step S430, if the condensing pressure value is less than the set condensing pressure value, the opening degree of the regulating water valve is controlled to keep the initial opening degree within the set running time of the compressor 6 being opened. Then, the regulating water valve is controlled according to the condensing pressure value and the outlet water temperature.

[0185] Step S440, if the condensing pressure value is greater than or equal to the set condensing pressure value, or the compressor 6 is opened for the set running time, the regulating water valve is controlled according to the condensing pressure value and the outlet water temperature.

[0186] As shown in the two-way regulating valve control method, the method further comprises: Figure 8

[0187] Step 44, the unit determines whether the compressor 6 needs to be opened according to the actual operation condition: if the compressor 6 has opening demand, step 45 is executed. Otherwise, return to step 43.

[0188] Step 45, first ensure that the cooling water circulation system is unobstructed, open the cooling water pump, and fully open the cooling water valve. After 30 seconds, adjust the initial opening degree according to the cooling water inlet temperature.

[0189] Step 46, after the compressor 6 is opened, the opening degree of the cooling water valve is controlled according to the condensing pressure sampling value (i.e. the control pressure value of the shell and tube condenser 11) Px.

[0190] The value of Px is extremely critical in the scheme of the present application, see Figure 7 Px is calculated from the pressure values of two fluorine systems. When both are less than 3000 KPa, Px takes the smaller value of the two. When both are greater than 3000 KPa, Px takes the larger value of the two. When the difference between the two is large, the condensing pressure of one system is greater than 3000 KPa, and the condensing pressure of the other system is less than 3000 KPa, Px takes the maximum value.

[0191] ​In step 46, it is also determined whether the condensing pressure Px is less than 2500 KPa: when the condensing pressure Px is less than 2500 KPa, the compressor 6 keeps the initial opening unchanged for 1 minute, and then the opening of the cooling water valve is adjusted according to the condensing pressure and the outlet water temperature. When the condensing pressure Px is greater than or equal to 2500 KPa or after the compressor 6 operates for 1 minute, the opening of the cooling water valve is directly adjusted according to the condensing pressure and the outlet water temperature.

[0192] In some embodiments, the control of the regulating water valve according to the condensing pressure value and the outlet water temperature in steps S430 and S440 includes any one of the following control cases:

[0193] The first control case: if the condensing pressure value is less than a first set pressure value, the regulating water valve is controlled to be closed in a first set adjusting period in the case that the sensor of the outlet water temperature is faulty. In the case that the sensor of the outlet water temperature is not faulty, if the outlet water temperature is less than a set outlet water temperature, the regulating water valve is controlled to be closed in the first set adjusting period, and if the outlet water temperature is greater than or equal to the set outlet water temperature, the regulating water valve is controlled to be opened in the first set adjusting period. The first set pressure value is, for example, 1900 KPa.

[0194] The second control case: if the condensing pressure value is greater than or equal to the first set pressure value and less than a second set pressure value, the opening of the regulating water valve is controlled to be unchanged in the case that the sensor of the outlet water temperature is faulty. In the case that the sensor of the outlet water temperature is not faulty, if the outlet water temperature is less than the set outlet water temperature, the opening of the regulating water valve is controlled to be unchanged, and if the outlet water temperature is greater than or equal to the set outlet water temperature, the regulating water valve is controlled to be opened in the first set adjusting period. The second set pressure value is, for example, 2300 KPa.

[0195] The third control case: if the condensing pressure value is greater than or equal to a second set pressure value and less than a third set pressure value, the regulating water valve is controlled to be opened in the first set adjusting period in the case that the sensor of the outlet water temperature is faulty. In the case that the sensor of the outlet water temperature is not faulty, if the outlet water temperature is less than the set outlet water temperature, the regulating water valve is controlled to be opened in the first set adjusting period, and if the outlet water temperature is greater than or equal to the set outlet water temperature, the regulating water valve is controlled to be opened in the first set adjusting period and the opening is increased in a larger amount. The third set pressure value is, for example, 2600 KPa.

[0196] The fourth control case: if the condensing pressure value is greater than or equal to a third set pressure value and less than a fourth set pressure value, the regulating water valve is controlled to be opened in a second set period. The fourth set pressure value is, for example, 2600 KPa.

[0197] Fifth control condition: if the condensing pressure value is greater than or equal to a fourth set pressure value and less than a fifth set pressure value, the regulating water valve is controlled to open by a third set period, and the compressor 6 is controlled to have a frequency increasing amplitude not greater than a set amplitude. The fifth set pressure value is, for example, 3300 KPa.

[0198] Sixth control condition: if the condensing pressure value is greater than or equal to the fifth set pressure value and less than a sixth set pressure value, the regulating water valve is controlled to close by a third set period, and the compressor 6 is controlled to have a frequency decreasing.

[0199] Seventh control condition: if the condensing pressure value is greater than or equal to the fifth set pressure value and greater than or equal to the sixth set pressure value, the regulating water valve is controlled to be fully open, and the compressor 6 is controlled to have a frequency increasing amplitude not greater than a set amplitude.

[0200] As shown in FIG. 6, the two-way regulating valve control method further includes: Figure 8

[0201] Step 47: when the condensing pressure Px is less than 1900 KPa, if the cooling water outlet temperature sensing bulb is faulty, the cooling water valve is only controlled to close by a small amount and not to open, and the regulating period is 1 minute / time.

[0202] It should be noted that the standard amplitude of the cooling water valve is 2% each time, and the subsequent description is omitted. When the cooling water outlet temperature sensing bulb is normal, if the outlet temperature Tout is less than 50°C, the cooling water valve is only controlled to close by a small amount and not to open, and the regulating period is 1 minute / time. If the outlet temperature Tout is greater than or equal to 50°C, the cooling water valve is only controlled to open by a large amount and not to close by a small amount, and the regulating period is 1 minute / time. When the condensing pressure Px is not less than 1900 KPa, step 48 is performed.

[0203] Step 48: when the condensing pressure Px is less than 2300 KPa, if the cooling water outlet temperature sensing bulb is faulty, the cooling water valve is kept at a constant opening degree. When the cooling water outlet temperature sensing bulb is normal, if the outlet temperature Tout is less than 50°C, the cooling water valve is kept at a constant opening degree. If the outlet temperature Tout is greater than or equal to 50°C, the cooling water valve is only controlled to open by a large amount and not to close by a small amount, and the regulating period is 1 minute / time. When the condensing pressure Px is not less than 2300 KPa, step 49 is performed.

[0204] ​Step 49, when the condensing pressure Px is less than 2600 KPa, if the cooling water outlet temperature sensing bulb is faulted, the cooling water valve is only opened but not closed, and the adjustment period is 1 minute / time. When the cooling water outlet temperature sensing bulb is normal, if the outlet temperature Tout is less than 50℃, the cooling water valve is only opened but not closed, and the adjustment period is 1 minute / time. If the outlet temperature Tout is greater than or equal to 50℃, the cooling water valve is only opened but not closed, and the adjustment range is doubled, and the adjustment period is 1 minute / time. When the condensing pressure Px is not less than 2600 KPa, step 50 is executed.

[0205] Step 50, when the condensing pressure Px is less than 3000 KPa, the cooling water valve is only opened but not closed, and the adjustment period is 30 seconds / time. When the condensing pressure Px is not less than 3000 KPa, step 51 is executed.

[0206] Step 51, when the condensing pressure Px is less than 3300 KPa, the cooling water valve is only opened but not closed, and the adjustment period is 15 seconds / time, and the compressor is not allowed to increase frequency but only allowed to decrease frequency. When the condensing pressure Px is not less than 3300 KPa, step 52 is executed.

[0207] Step 52, when the condensing pressure Px is less than 3500 KPa, the cooling water valve is only opened but not closed, and the adjustment period is 15 seconds / time, and the compressor is only allowed to decrease frequency but not allowed to increase frequency. When the condensing pressure Px is not less than 3500 KPa, step 53 is executed.

[0208] Step 53, when the condensing pressure Px is greater than or equal to 3500 KPa, the cooling water valve is adjusted to the fully opened state (100% opening), and the compressor 6 is forced to decrease frequency by 2 HZ each time.

[0209] In Figure 8 In the example shown, the control of the two-way regulating valve (i.e. the cooling water valve, such as the two-way regulating water valve 63) involves the main variables of the condensing pressure Px (referring to the pressure detected by the high-pressure sensor) and the outlet water temperature Tout (referring to the temperature detected by the outlet water temperature sensing bulb 86), and the control of the two-way regulating valve is determined by the comprehensive judgment of the two variables.

[0210] In the above embodiment, the scheme of the present application mainly adopts the condensing pressure of two systems to take the required value according to the rules, and then combines the outlet water temperature of the cooling water to adjust the opening range and adjustment period of the cooling water valve. The compressor discharge temperature can also be used to replace the outlet water temperature of the cooling water to formulate the corresponding rules. If there is no condensing pressure, the outlet water temperature of the cooling water and the compressor discharge temperature can also be combined to realize the control of the cooling water valve.

[0211] The scheme of the present application proposes a new built-in condensing shell pipe control method, formulates a new two-way throttling valve control logic, realizes that two fluorine systems share one condensing shell pipe water cooling system, and balances the heat exchange effects of the two fluorine systems by controlling the cooling water flow through a two-way regulating valve. This is conducive to reducing the pipeline, reducing the installation cost, reducing the water system resistance, and improving the unit energy efficiency ratio.

[0212] Since the processing and functions realized by the method of the present embodiment are basically corresponding to the foregoing embodiments, principles and examples of the machine room air conditioner, the description of the present embodiment will not be elaborated, and the related descriptions in the foregoing embodiments can be referred to, which will not be repeated here.

[0213] By adopting the technical scheme of the present embodiment, two independent compressor fluorine systems share one shell pipe condenser, the condensing pressures of the two independent compressor fluorine systems are collected, the opening of the throttling valve is controlled according to the range where the condensing pressure is located and the outlet water temperature of the shell pipe condenser, the opening of the throttling valve is controlled, and the two independent compressor fluorine systems share one shell pipe condenser to stably operate, which is conducive to improving the unit energy efficiency ratio and reducing the design cost.

[0214] In summary, those skilled in the art can easily understand that the above-mentioned advantageous modes can be freely combined and superimposed without conflict.

[0215] The above only describes the embodiments of the present application and is not used to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the scope of the claims of the present application.

Claims

1. A control device for a computer room air conditioner, characterized in that, The computer room air conditioner uses a dual-fluorine system sharing a built-in shell-and-tube condenser (11); the dual-fluorine system includes: a first compressor fluorine system and a second compressor fluorine system; the first compressor fluorine system and the second compressor fluorine system are independently set up and share the shell-and-tube condenser (11); the shell-and-tube condenser (11) has a cooling water outlet pipe, and a regulating water valve is installed on the cooling water outlet pipe of the shell-and-tube condenser (11); the control device of the computer room air conditioner includes: The acquisition unit is configured to acquire the pressure value of the first compressor refrigerant system, denoted as the first high-pressure pressure value; acquire the pressure value of the second compressor refrigerant system, denoted as the second high-pressure pressure value; and acquire the outlet water temperature of the shell-and-tube condenser (11); the first high-pressure pressure value is the pressure value in the pipeline connected to the first refrigerant outlet of the shell-and-tube condenser (11); the second high-pressure pressure value is the pressure value in the pipeline connected to the second refrigerant outlet of the shell-and-tube condenser (11). The control unit is configured to determine the condensing pressure value of the shell-and-tube condenser (11) based on the first high-pressure value and the second high-pressure value; The control unit is also configured to control the regulating water valve according to the condensing pressure value of the shell-and-tube condenser (11) and the outlet water temperature of the shell-and-tube condenser (11); collect the condensing pressure of the two independent compressor refrigerant systems according to certain conditions, and then formulate corresponding throttle valve opening control criteria according to the range of the condensing pressure value and the outlet water temperature, so as to achieve the purpose of stable operation of the two systems sharing one shell-and-tube condenser.

2. The control device for a computer room air conditioner according to claim 1, characterized in that, The first compressor refrigerant system includes: a heat exchanger, a compressor (6), and a throttling element; wherein, The refrigerant outlet of the heat exchanger is connected to the suction port of the compressor (6) through a first pipeline; the discharge port of the compressor (6) is connected to the first refrigerant inlet of the shell-and-tube condenser (11) through a second pipeline; and the first refrigerant outlet of the shell-and-tube condenser (11) is connected to the refrigerant inlet of the heat exchanger through a third pipeline. The throttling element is disposed on the third pipeline.

3. The control device for a computer room air conditioner according to claim 2, characterized in that, The throttling element includes a capillary tube (8) and an electronic expansion valve (7); the capillary tube (8) and the electronic expansion valve (7) are arranged in parallel.

4. The control device for a computer room air conditioner according to claim 2, characterized in that, The first compressor refrigerant system further includes: an electric heater (3) and an EC fan (5); wherein, The electric heater (3) is disposed between the heat exchanger and the EC fan (5).

5. The control device for a computer room air conditioner according to claim 4, characterized in that, The first compressor refrigerant system further includes: an electrode humidifier (4); the electrode humidifier (4) is disposed between the electric heater (3) and the EC fan (5).

6. The control device for a computer room air conditioner according to any one of claims 2 to 4, characterized in that, The structure of the second compressor fluorine system is the same as that of the first compressor fluorine system.

7. The control device for a computer room air conditioner according to any one of claims 2 to 5, characterized in that, in, The outlet water temperature of the shell-and-tube condenser (11) is the temperature in the pipeline connected to the cooling water outlet of the shell-and-tube condenser (11).

8. The control device for a computer room air conditioner according to any one of claims 1 to 5, characterized in that, The control unit determines the condensing pressure value of the shell-and-tube condenser (11) based on the first high-pressure value and the second high-pressure value, including: Determine whether the first high-pressure value is less than the second high-pressure value; If the first high-pressure value is less than the second high-pressure value, then if the second high-pressure value is less than the set high-pressure value, the first high-pressure value is determined to be the condensing pressure value of the shell-and-tube condenser (11); if the second high-pressure value is greater than or equal to the set high-pressure value, the second high-pressure value is determined to be the condensing pressure value of the shell-and-tube condenser (11). If the first high-pressure value is greater than or equal to the second high-pressure value, then if the first high-pressure value is less than the set high-pressure value, the second high-pressure value is determined to be the condensing pressure value of the shell-and-tube condenser (11); if the first high-pressure value is greater than or equal to the set high-pressure value, the first high-pressure value is determined to be the condensing pressure value of the shell-and-tube condenser (11).

9. The control device for a computer room air conditioner according to any one of claims 1 to 5, characterized in that, The control unit controls the regulating water valve based on the condensing pressure of the shell-and-tube condenser (11) and the outlet water temperature of the shell-and-tube condenser (11), including: After the air conditioner in the computer room is powered on, the regulating water valve is controlled to perform a reset action; After the power-on time is set for the air conditioner in the computer room, the initial opening degree of the regulating water valve is determined according to the cooling water inlet temperature of the shell-and-tube condenser (11). The control unit determines the initial opening degree of the regulating water valve based on the cooling water inlet temperature of the shell-and-tube condenser (11), including: In the event that the cooling water inlet temperature of the shell-and-tube condenser (11) is less than the set inlet temperature or the sensor for the cooling water inlet temperature of the shell-and-tube condenser (11) is faulty, the initial opening degree of the regulating water valve is determined to be the first opening degree. If the cooling water inlet temperature of the shell-and-tube condenser (11) is greater than or equal to the set inlet temperature, and the sensor for the cooling water inlet temperature of the shell-and-tube condenser (11) is not faulty, the initial opening of the regulating water valve is determined to be the second opening; the second opening is greater than the first opening.

10. The control device for a computer room air conditioner according to claim 9, characterized in that, The control unit, which controls the regulating water valve based on the condensing pressure of the shell-and-tube condenser (11) and the outlet water temperature of the shell-and-tube condenser (11), further includes: When the compressor (6) of the computer room air conditioner needs to be turned on, the cooling water pump of the computer room air conditioner is turned on, and the regulating water valve is fully opened. After setting the opening time, the opening degree of the regulating water valve is controlled to the predetermined initial opening degree. Determine whether the condensing pressure value is less than the set condensing pressure value; If the condensing pressure value is less than the set condensing pressure value, the opening of the regulating water valve is controlled to maintain the initial opening during the set operating time of the compressor (6); then, the regulating water valve is controlled according to the condensing pressure value and the outlet water temperature. If the condensing pressure value is greater than or equal to the set condensing pressure value, or after the compressor (6) starts the set running time, the regulating water valve is controlled according to the condensing pressure value and the outlet water temperature.

11. The control device for a computer room air conditioner according to claim 10, characterized in that, The control unit controls the regulating water valve based on the condensation pressure value and the outlet water temperature, including: If the condensation pressure value is less than the first set pressure value, then in the event of a malfunction in the outlet water temperature sensor, the regulating water valve is controlled to close slightly according to the first set adjustment cycle; if the outlet water temperature sensor is not malfunctioning, then if the outlet water temperature is less than the set outlet water temperature, the regulating water valve is controlled to close slightly according to the first set adjustment cycle; if the outlet water temperature is greater than or equal to the set outlet water temperature, the regulating water valve is controlled to open slightly according to the first set adjustment cycle. If the condensation pressure value is greater than or equal to the first set pressure value and less than the second set pressure value, then in the event of a fault in the outlet water temperature sensor, the opening of the regulating water valve remains unchanged; if the outlet water temperature sensor is not faulty, then if the outlet water temperature is less than the set outlet water temperature, the opening of the regulating water valve remains unchanged; if the outlet water temperature is greater than or equal to the set outlet water temperature, then the regulating water valve is opened wider according to the first set adjustment cycle. If the condensation pressure value is greater than or equal to the second set pressure value and less than the third set pressure value, then in the event of a fault in the outlet water temperature sensor, the regulating water valve is opened wider according to the first set adjustment cycle; if the outlet water temperature sensor is not faulty, then if the outlet water temperature is less than the set outlet water temperature, the regulating water valve is opened wider according to the first set adjustment cycle; if the outlet water temperature is greater than or equal to the set outlet water temperature, the regulating water valve is opened wider according to the first set adjustment cycle, and the opening amplitude is increased. If the condensation pressure value is greater than or equal to the third set pressure value and less than the fourth set pressure value, then the regulating water valve is opened according to the second set cycle. If the condensing pressure value is greater than or equal to the fourth set pressure value and less than the fifth set pressure value, then the regulating water valve is opened according to the third set cycle, and the frequency increase amplitude of the compressor (6) is controlled not to be greater than the set amplitude. If the condensing pressure value is greater than or equal to the fifth set pressure value and less than the sixth set pressure value, then the regulating water valve is controlled to close less according to the third set cycle, and the frequency of the compressor (6) is controlled to decrease. If the condensing pressure value is greater than or equal to the fifth set pressure value and greater than or equal to the sixth set pressure value, then the regulating water valve is fully opened, and the frequency increase amplitude of the compressor (6) is controlled not to be greater than the set amplitude.

12. A computer room air conditioner, characterized in that, include: The control device for the computer room air conditioner as described in any one of claims 1 to 11.

13. A control method for a computer room air conditioner as described in claim 12, characterized in that, include: Obtain the pressure value of the first compressor refrigerant system and record it as the first high-pressure pressure value; obtain the pressure value of the second compressor refrigerant system and record it as the second high-pressure pressure value; and obtain the outlet water temperature of the shell and tube condenser (11); The condensing pressure value of the shell-and-tube condenser (11) is determined based on the first high-pressure value and the second high-pressure value. The regulating water valve is controlled according to the condensing pressure value of the shell-and-tube condenser (11) and the outlet water temperature of the shell-and-tube condenser (11).

14. The control method for a computer room air conditioner according to claim 13, characterized in that, The condensing pressure value of the shell-and-tube condenser (11) is determined based on the first high-pressure value and the second high-pressure value, including: Determine whether the first high-pressure value is less than the second high-pressure value; If the first high-pressure value is less than the second high-pressure value, then if the second high-pressure value is less than the set high-pressure value, the first high-pressure value is determined to be the condensing pressure value of the shell-and-tube condenser (11); if the second high-pressure value is greater than or equal to the set high-pressure value, the second high-pressure value is determined to be the condensing pressure value of the shell-and-tube condenser (11). If the first high-pressure value is greater than or equal to the second high-pressure value, then if the first high-pressure value is less than the set high-pressure value, the second high-pressure value is determined to be the condensing pressure value of the shell-and-tube condenser (11); if the first high-pressure value is greater than or equal to the set high-pressure value, the first high-pressure value is determined to be the condensing pressure value of the shell-and-tube condenser (11).

15. The control method for a computer room air conditioner according to claim 13, characterized in that, Controlling the regulating water valve based on the condensing pressure of the shell-and-tube condenser (11) and the outlet water temperature of the shell-and-tube condenser (11) includes: After the air conditioner in the computer room is powered on, the regulating water valve is controlled to perform a reset action; After the power-on time is set for the air conditioner in the computer room, the initial opening degree of the regulating water valve is determined according to the cooling water inlet temperature of the shell-and-tube condenser (11). The determination of the initial opening degree of the regulating water valve based on the cooling water inlet temperature of the shell-and-tube condenser (11) includes: In the event that the cooling water inlet temperature of the shell-and-tube condenser (11) is less than the set inlet temperature or the sensor for the cooling water inlet temperature of the shell-and-tube condenser (11) is faulty, the initial opening degree of the regulating water valve is determined to be the first opening degree. If the cooling water inlet temperature of the shell-and-tube condenser (11) is greater than or equal to the set inlet temperature, and the sensor for the cooling water inlet temperature of the shell-and-tube condenser (11) is not faulty, the initial opening of the regulating water valve is determined to be the second opening; the second opening is greater than the first opening.

16. The control method for a computer room air conditioner according to claim 15, characterized in that, The regulating water valve is controlled based on the condensing pressure of the shell-and-tube condenser (11) and the outlet water temperature of the shell-and-tube condenser (11), and further includes: When the compressor (6) of the computer room air conditioner needs to be turned on, the cooling water pump of the computer room air conditioner is turned on, and the regulating water valve is fully opened. After setting the opening time, the opening degree of the regulating water valve is controlled to the predetermined initial opening degree. Determine whether the condensing pressure value is less than the set condensing pressure value; If the condensing pressure value is less than the set condensing pressure value, the opening of the regulating water valve is controlled to maintain the initial opening during the set operating time of the compressor (6); then, the regulating water valve is controlled according to the condensing pressure value and the outlet water temperature. If the condensing pressure value is greater than or equal to the set condensing pressure value, or after the compressor (6) starts the set running time, the regulating water valve is controlled according to the condensing pressure value and the outlet water temperature.

17. The control method for a computer room air conditioner according to claim 16, characterized in that, Controlling the regulating water valve based on the condensation pressure value and the outlet water temperature includes: If the condensation pressure value is less than the first set pressure value, then in the event of a malfunction in the outlet water temperature sensor, the regulating water valve is controlled to close slightly according to the first set adjustment cycle; if the outlet water temperature sensor is not malfunctioning, then if the outlet water temperature is less than the set outlet water temperature, the regulating water valve is controlled to close slightly according to the first set adjustment cycle; if the outlet water temperature is greater than or equal to the set outlet water temperature, the regulating water valve is controlled to open slightly according to the first set adjustment cycle. If the condensation pressure value is greater than or equal to the first set pressure value and less than the second set pressure value, then in the event of a fault in the outlet water temperature sensor, the opening of the regulating water valve remains unchanged; if the outlet water temperature sensor is not faulty, then if the outlet water temperature is less than the set outlet water temperature, the opening of the regulating water valve remains unchanged; if the outlet water temperature is greater than or equal to the set outlet water temperature, then the regulating water valve is opened wider according to the first set adjustment cycle. If the condensation pressure value is greater than or equal to the second set pressure value and less than the third set pressure value, then in the event of a fault in the outlet water temperature sensor, the regulating water valve is opened wider according to the first set adjustment cycle; if the outlet water temperature sensor is not faulty, then if the outlet water temperature is less than the set outlet water temperature, the regulating water valve is opened wider according to the first set adjustment cycle; if the outlet water temperature is greater than or equal to the set outlet water temperature, the regulating water valve is opened wider according to the first set adjustment cycle, and the opening amplitude is increased. If the condensation pressure value is greater than or equal to the third set pressure value and less than the fourth set pressure value, then the regulating water valve is opened according to the second set cycle. If the condensing pressure value is greater than or equal to the fourth set pressure value and less than the fifth set pressure value, then the regulating water valve is opened according to the third set cycle, and the frequency increase amplitude of the compressor (6) is controlled not to be greater than the set amplitude. If the condensing pressure value is greater than or equal to the fifth set pressure value and less than the sixth set pressure value, then the regulating water valve is controlled to close less according to the third set cycle, and the frequency of the compressor (6) is controlled to decrease. If the condensing pressure value is greater than or equal to the fifth set pressure value and greater than or equal to the sixth set pressure value, then the regulating water valve is fully opened, and the frequency increase amplitude of the compressor (6) is controlled not to be greater than the set amplitude.

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