Double-cold-source multi-connected evaporation air-conditioning system

Abstract

The utility model provides a double-cold-source multi-connected evaporation air conditioning system, and relates to the technical field of refrigeration. The double-cold-source multi-connected evaporation air conditioning system comprises an evaporation cooling device and a plurality of air cooling refrigeration devices. The evaporative cooling device is provided with a water outlet and a water inlet; the air-cooled refrigerating devices are connected in parallel, each air-cooled refrigerating device comprises a compressor, a condenser, a heat exchanger, an expansion valve and an evaporator, each heat exchanger is provided with a refrigerant flow channel and a cooling water flow channel, and the refrigerant flow channels and the cooling water flow channels are arranged in a matched mode. A refrigerant outlet end of the compressor, the condenser, a refrigerant flow channel of the heat exchanger, the expansion valve, the evaporator and a refrigerant inlet end of the compressor are sequentially connected, and a cooling water flow channel of the heat exchanger is matched with a water outlet and a water inlet of the evaporative cooling device respectively. The double-cold-source multi-connected evaporation air conditioning system can achieve the technical effect of improving the refrigeration energy efficiency.

Description

Technical Field

[0001] The present application relates to the field of refrigeration technology, and in particular to a dual-cold-source multi-connected evaporative air-conditioning system. Background Art

[0002] At present, most old data centers use air cooling systems. However, the condensation temperature of the air cooling system is relatively high, resulting in high power consumption of the cooling system. Generally, traditional cooling water transportation mostly uses a single supply and return water temperature difference or the number of terminal openings for loading / unloading, which easily leads to insufficient water at the farthest end. It is not only difficult to ensure the temperature range of the data center, but also the cooling system has low energy efficiency. Utility Model Content

[0003] The purpose of the present application is to provide a dual-cold-source multi-connected evaporative air-conditioning system and a control method, which can achieve the technical effect of improving refrigeration energy efficiency.

[0004] In a first aspect, the present application provides a dual-cold-source multi-connected evaporative air-conditioning system, including an evaporative cooling device and a plurality of air-cooled refrigeration devices;

[0005] The evaporative cooling device is provided with a water outlet and a water inlet;

[0006] The multiple air-cooled refrigeration devices are connected in parallel, and the air-cooled refrigeration devices include a compressor, a condenser, a heat exchanger, an expansion valve, and an evaporator. The heat exchanger is provided with a refrigerant flow channel and a cooling water flow channel, and the refrigerant flow channel and the cooling water flow channel are matched. The refrigerant outlet end of the compressor, the condenser, the refrigerant flow channel of the heat exchanger, the expansion valve, the evaporator, and the refrigerant inlet end of the compressor are connected in sequence, and the cooling water flow channel of the heat exchanger is matched with the water outlet and water inlet of the evaporative cooling device, respectively.

[0007] In the above implementation process, the dual-cold-source multi-split evaporative air-conditioning system matches a plurality of air-cooled refrigeration devices through an evaporative cooling device, and the evaporative cooling device is connected in parallel with the cooling water flow channels of the heat exchangers in the plurality of air-cooled refrigeration devices. Thus, the dual-cold-source multi-split evaporative air-conditioning system can operate both an evaporative cooling mode based on the evaporative cooling device and an air-cooling mode based on the air-cooled refrigeration device. The evaporative cooling mode and the air-cooling mode are backup for each other, which can improve the operating stability on the one hand, and reduce the system condensing temperature when operating the evaporative cooling mode on the other hand, thereby reducing the energy consumption of the unit. Thus, the dual-cold-source multi-split evaporative air-conditioning system can achieve the technical effect of improving refrigeration energy efficiency.

[0008] Furthermore, the evaporative cooling device includes a cooling fan, a cooling water pump, a water distribution mechanism, a filler and a water tank. The water distribution mechanism is matched with the filler. The cooling fan, the filler and the water tank are arranged in sequence from top to bottom. The cooling water pump is connected to the water tank. The water distribution mechanism and the cooling water pump are respectively connected to the cooling water flow channel of the heat exchanger.

[0009] In the above implementation process, by adding an intermediate heat exchanger, the cooling water in the evaporative cooling device and the cooling water in the heat exchanger can exchange heat without being connected, so that the open cooling water path in the evaporative cooling device is distinguished from the closed cooling water path in the heat exchanger, thereby ensuring the cleanliness of the cooling water in the heat exchanger, reducing the scale formed by external impurities in the heat exchanger and affecting the heat exchange, and improving the operating stability of the heat exchanger.

[0010] Furthermore, the air-cooled refrigeration device also includes an intermediate heat exchanger, which is provided with a first intermediate cooling water channel and a second intermediate cooling water channel, and the first intermediate cooling water channel and the second intermediate cooling water channel are matched and arranged, wherein the first intermediate cooling water channel is connected to the water outlet and the water inlet of the evaporative cooling device, and the second intermediate cooling water channel is connected to the cooling water channel of the heat exchanger.

[0011] In the above implementation process, the cooling water pumping of the closed cooling water circuit in the heat exchanger is completed by the intermediate water pump, and the cooling water pumping of the open cooling water circuit in the evaporative cooling device is completed by the cooling water pump.

[0012] Furthermore, the evaporative cooling device includes a cooling fan, a cooling water pump, a water distribution mechanism, a packing and a water tank, the water distribution mechanism is matched with the packing, the cooling fan, the packing and the water tank are arranged in sequence from top to bottom, the cooling water pump is connected to the water tank, and the air-cooled refrigeration device also includes an intermediate water pump, the water distribution mechanism and the cooling water pump are respectively connected to the first intermediate cooling water flow channel, and the cooling water flow channel of the heat exchanger is respectively connected to the intermediate water pump and the second intermediate cooling water flow channel.

[0013] In the above implementation process, the cooling water in the evaporative cooling device is pumped from the water tank to the cooling water flow channel of the heat exchanger through a cooling water pump. After the heat exchange is completed, the cooling water is transported to the water distribution mechanism, and drips to the filler under the action of gravity through the water distribution mechanism and then recovered to the water tank. The cooling fan is used to improve the air circulation efficiency when the cooling water passes through the filler, thereby accelerating the heat exchange efficiency.

[0014] Furthermore, the air-cooled refrigeration device also includes a first fan, and the first fan is matched with the condenser.

[0015] In the above implementation process, the air circulation efficiency of the condenser is improved by the first fan, thereby improving the working efficiency of the condenser.

[0016] Furthermore, the air-cooled refrigeration device also includes a second fan, and the second fan is matched with the evaporator.

[0017] In the above implementation process, the air circulation efficiency of the evaporator is improved by the second fan, thereby improving the working efficiency of the evaporator.

[0018] Furthermore, the air-cooled refrigeration device also includes a solenoid valve, which is arranged in the cooling water flow channel of the heat exchanger.

[0019] In the above implementation process, the flow rate of cooling water in the cooling water flow channel of the heat exchanger is adjusted by the solenoid valve, thereby facilitating the unified regulation of cooling water in the evaporative cooling device and the air-cooled refrigeration device.

[0020] Furthermore, the air-cooled refrigeration device also includes a pressure sensor, and the pressure sensor is arranged at the outlet end of the compressor.

[0021] In the above implementation process, a pressure sensor is provided at the outlet of the compressor to detect the refrigerant pressure at the outlet of the compressor, thereby ensuring the normal operation of the compressor.

[0022] Furthermore, the heat exchanger is a shell and tube heat exchanger.

[0023] Furthermore, the condenser is an air-cooled condenser.

[0024] In a second aspect, the present application provides a control method, which is applied to the dual-cold-source multi-connected evaporative air-conditioning system according to any one of the first aspects, and the control method includes:

[0025] Acquire a startup signal, where the startup signal is determined according to one or more of a startup signal of the compressor, outlet pressure information of the compressor, and liquid pipe temperature information of the compressor;

[0026] Controlling the dual-cold-source multi-connected evaporative air-conditioning system to operate in an evaporative cooling mode according to the startup signal, wherein the evaporative cooling device is turned on in the evaporative cooling mode;

[0027] When a fault is detected in the evaporative cooling device, the operation mode of the dual-cold-source multi-connected evaporative air-conditioning system is switched to an air-cooling mode, in which the evaporative cooling device is turned off.

[0028] In the above implementation process, the dual-cold-source multi-split evaporative air-conditioning system is turned on according to a specific start-up signal, and the evaporative cooling mode is operated by default, and the air cooling mode is enabled when the evaporative cooling device fails; thus, the dual-cold-source multi-split evaporative air-conditioning system can operate the evaporative cooling mode based on the evaporative cooling device, and can also operate the air cooling mode based on the air cooling refrigeration device. The evaporative cooling mode and the air cooling mode are backup for each other, which can improve the operating stability on the one hand, and reduce the system condensing temperature when operating the evaporative cooling mode on the other hand, thereby reducing the energy consumption of the unit.

[0029] Furthermore, the control method further includes:

[0030] In the evaporative cooling mode, the cooling water pump is controlled by fixed frequency, and the intermediate water pump is controlled by variable frequency; wherein the variable frequency control is determined according to the number of cooling water channels opened, the opening change rate of the cooling water channels, and the supply and return water temperature difference of the heat exchanger;

[0031] In the evaporative cooling mode, the cooling fan is controlled according to the water temperature of the water tank in the evaporative cooling device.

[0032] Other features and advantages disclosed in the present application will be described in the following description, or some features and advantages can be inferred or determined without doubt from the description, or can be learned by implementing the above-mentioned technology disclosed in the present application.

[0033] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 A schematic diagram of the structure of a dual-cold-source multi-connected evaporative air-conditioning system provided in an embodiment of the present application;

[0036] Figure 2 A schematic diagram of the structure of another dual-cold-source multi-connected evaporative air-conditioning system provided in an embodiment of the present application;

[0037] Figure 3 A flow chart of a control method provided in an embodiment of the present application;

[0038] Figure 4 Schematic diagram of the combined control of the supply and return water temperature difference and valve components provided in an embodiment of the present application.

[0039] Figure numerals: evaporative cooling device 100; cooling fan 110; cooling water pump 120; water distribution mechanism 130; filler 140; water tank 150; air-cooled refrigeration device 200; compressor 210; condenser 220; heat exchanger 230; expansion valve 240; evaporator 250; first fan 261; second fan 262; solenoid valve 270; pressure sensor 280; first temperature sensor 281; second temperature sensor 282; controller 283; intermediate heat exchanger 290; intermediate water pump 291. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0041] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0042] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0043] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or a point connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0045] The embodiment of the present application provides a dual-cold-source multi-split evaporative air-conditioning system and a control method, which can be applied to refrigeration, for example, in the cooling process of a data center; the dual-cold-source multi-split evaporative air-conditioning system matches a plurality of air-cooled refrigeration devices through an evaporative cooling device, and the evaporative cooling device is connected in parallel with the cooling water flow channels of the heat exchangers in the plurality of air-cooled refrigeration devices. Thus, the dual-cold-source multi-split evaporative air-conditioning system can operate in an evaporative cooling mode based on the evaporative cooling device, or in an air-cooling mode based on the air-cooled refrigeration device. The evaporative cooling mode and the air-cooling mode are backup for each other, which can improve the operating stability on the one hand, and reduce the system condensing temperature when operating in the evaporative cooling mode on the other hand, thereby reducing the energy consumption of the unit; thus, the dual-cold-source multi-split evaporative air-conditioning system can achieve the technical effect of improving refrigeration energy efficiency.

[0046] See also Figure 1 , Figure 1 A schematic structural diagram of a dual-cold-source multi-connected evaporative air-conditioning system provided in an embodiment of the present application, wherein the dual-cold-source multi-connected evaporative air-conditioning system comprises an evaporative cooling device 100 and a plurality of air-cooled refrigeration devices 200;

[0047] Exemplarily, the evaporative cooling device 100 is provided with a water outlet and a water inlet;

[0048] The water outlet and the water inlet of the evaporative cooling device 100 are used for the outflow and inflow of cooling water respectively.

[0049] Exemplarily, multiple air-cooled refrigeration devices 200 are connected in parallel, and the air-cooled refrigeration devices 200 include a compressor 210, a condenser 220, a heat exchanger 230, an expansion valve 240, and an evaporator 250. The heat exchanger 230 is provided with a refrigerant flow channel and a cooling water flow channel, and the refrigerant flow channel and the cooling water flow channel are matched. The refrigerant outlet end of the compressor 210, the condenser 220, the refrigerant flow channel of the heat exchanger 230, the expansion valve 240, the evaporator 250, and the refrigerant inlet end of the compressor 210 are connected in sequence, and the cooling water flow channel of the heat exchanger 230 is matched with the water outlet and the water inlet of the evaporative cooling device 100, respectively.

[0050] Exemplarily, the refrigerant flow channel and the cooling water flow channel in the heat exchanger 230 are matched and arranged, wherein the refrigerant flow channel is used to circulate the refrigerant and the cooling water flow channel is used to circulate the cooling water, and the refrigerant in the refrigerant flow channel inside the heat exchanger 230 and the cooling water in the cooling water flow channel can undergo heat exchange, that is, the refrigerant and the cooling water undergo heat exchange.

[0051] Exemplarily, the refrigerant outlet of the compressor 210, the condenser 220, the refrigerant flow path of the heat exchanger 230, the expansion valve 240, the evaporator 250, and the refrigerant inlet of the compressor 210 are connected in sequence for circulation of the refrigerant;

[0052] The water outlet and water inlet of the evaporative cooling device 100 are matched with the cooling water flow channel of the heat exchanger 230 for the circulation of cooling water; wherein the cooling water and the refrigerant can exchange heat in the heat exchange tube to achieve air conditioning refrigeration.

[0053] It should be noted that Figure 1 The figure shows that two groups of air-cooled refrigeration devices 200 are connected in parallel; optionally, the number of air-cooled refrigeration devices 200 provided in the embodiment of the present application is not limited, and the evaporative cooling device 100 can be connected in parallel with one, two or more air-cooled refrigeration devices 200 as needed.

[0054] In some embodiments, the dual-cold-source multi-split evaporative air-conditioning system matches a plurality of air-cooled refrigeration devices 200 with an evaporative cooling device 100, and the cooling water flow channels of the heat exchangers 230 in the evaporative cooling device 100 and the plurality of air-cooled refrigeration devices 200 are connected in parallel. Thus, the dual-cold-source multi-split evaporative air-conditioning system can operate both an evaporative cooling mode based on the evaporative cooling device and an air-cooling mode based on the air-cooled refrigeration device. The evaporative cooling mode and the air-cooling mode serve as backup for each other, which can improve the operating stability on the one hand, and can reduce the system condensing temperature when operating in the evaporative cooling mode on the other hand, thereby reducing the energy consumption of the unit. Thus, the dual-cold-source multi-split evaporative air-conditioning system can achieve the technical effect of improving refrigeration energy efficiency.

[0055] Exemplarily, the evaporative cooling device 100 includes a cooling fan 110, a cooling water pump 120, a water distribution mechanism 130, a filler 140 and a water tank 150. The water distribution mechanism 130 is matched with the filler 140. The cooling fan 110, the filler 140 and the water tank 150 are arranged in sequence from top to bottom. The cooling water pump 120 is connected to the water tank 150. The water distribution mechanism 130 and the cooling water pump 120 are respectively connected to the cooling water flow channel of the heat exchanger 230.

[0056] Exemplarily, in the evaporative cooling device 100, cooling water is pumped from the water tank 150 to the cooling water flow channel of the heat exchanger by the cooling water pump 120. After the heat exchange is completed, the cooling water is transported to the water distribution mechanism 130, and drips to the filler 140 through the water distribution mechanism 130 under the action of gravity, and then is recovered to the water tank 150. The cooling fan 110 is used to improve the air circulation efficiency when the cooling water passes through the filler 140, thereby accelerating the heat exchange efficiency.

[0057] Exemplarily, the air-cooled refrigeration device further includes a first fan 261 , and the first fan 261 is matched with the condenser 220 .

[0058] Exemplarily, the air circulation efficiency of the condenser 220 is improved by the first fan 261 , thereby improving the working efficiency of the condenser 220 .

[0059] Exemplarily, the air-cooled refrigeration device further includes a second fan 262 , and the second fan 262 is matched with the evaporator 250 .

[0060] Exemplarily, the air circulation efficiency of the evaporator 250 is improved by the second fan 262 , thereby improving the working efficiency of the evaporator 250 .

[0061] Exemplarily, the air-cooled refrigeration device 200 further includes a solenoid valve 270 , which is disposed in a cooling water flow channel of the heat exchanger 230 .

[0062] Exemplarily, the flow rate of cooling water in the cooling water flow channel of the heat exchanger 230 is adjusted by the solenoid valve 270 , thereby facilitating the unified regulation of cooling water in the evaporative cooling device 100 and the air-cooled refrigeration device 200 .

[0063] Exemplarily, the air-cooled refrigeration device 200 further includes a pressure sensor 280 , which is disposed at the outlet end of the compressor 210 .

[0064] Exemplarily, by disposing a pressure sensor 280 at the outlet of the compressor 210 , the refrigerant pressure at the outlet of the compressor 210 is detected, thereby ensuring the normal operation of the compressor 210 .

[0065] Exemplarily, the heat exchanger 230 is a shell and tube heat exchanger.

[0066] Exemplarily, the condenser 220 is an air-cooled condenser.

[0067] See also Figure 2 , Figure 2 A schematic structural diagram of another dual-cold-source multi-connected evaporative air-conditioning system provided in an embodiment of the present application.

[0068] Exemplarily, the air-cooled refrigeration device 200 also includes an intermediate heat exchanger 290, which is provided with a first intermediate cooling water channel and a second intermediate cooling water channel, and the first intermediate cooling water channel and the second intermediate cooling water channel are matched and arranged, wherein the first intermediate cooling water channel is connected to the water outlet and the water inlet of the evaporative cooling device 100, and the second intermediate cooling water channel is connected to the cooling water channel of the heat exchanger 230.

[0069] Illustratively, by adding an intermediate heat exchanger 290, the cooling water in the evaporative cooling device 100 and the cooling water in the heat exchanger 230 can exchange heat without being connected, so that the open cooling water circuit in the evaporative cooling device 100 is distinguished from the closed cooling water circuit in the heat exchanger 230, thereby ensuring the cleanliness of the cooling water in the heat exchanger 230, reducing the formation of scale by external impurities in the heat exchanger 230 that affects heat exchange, and improving the operating stability of the heat exchanger 230.

[0070] Optionally, the intermediate heat exchanger 290 is a plate heat exchanger.

[0071] Exemplarily, the evaporative cooling device 100 includes a cooling fan 110, a cooling water pump 120, a water distribution mechanism 130, a packing 140 and a water tank 150. The water distribution mechanism 130 is matched with the packing 140. The cooling fan 110, the packing 140 and the water tank 150 are arranged in sequence from top to bottom. The cooling water pump 120 is connected to the water tank 150. The air-cooled refrigeration device 200 also includes an intermediate water pump 291. The water distribution mechanism 130 and the cooling water pump 120 are respectively connected to the first intermediate cooling water flow channel, and the cooling water flow channel of the heat exchanger 230 is respectively connected to the intermediate water pump 291 and the second intermediate cooling water flow channel.

[0072] Exemplarily, cooling water pumping of the closed cooling water circuit in the heat exchanger 230 is completed by the intermediate water pump 291 , and cooling water pumping of the open cooling water circuit in the evaporative cooling device 100 is completed by the cooling water pump 120 .

[0073] In some embodiments, the dual cold source multi-connected evaporative air conditioning system provided in the embodiments of the present application is as follows: Figure 1 As shown, the refrigerant flow channels (refrigerant flow channels) of the condenser 220 and the heat exchanger 230 are connected in series, and the heat exchanger 230 is installed near the condenser 220 to improve the installation efficiency; when the heat exchanger 230 is a shell and tube heat exchanger, the cooling water flows through the tube side (cooling water flow channel) and the refrigerant flows through the shell side, and there is a refrigerant collecting tank at the bottom of the shell and tube heat exchange.

[0074] In some embodiments, the dual cold source multi-connected evaporative air conditioning system provided in the embodiments of the present application is as follows: Figure 2 As shown in the figure, the dual cold source multi-connected evaporative air conditioning system Figure 1 On the basis of the above, an intermediate heat exchanger 290 and an intermediate water pump 291 are added to distinguish the open cooling water circuit of the evaporative cooling device 100 from the closed cooling water circuit of the heat exchanger 230, thereby ensuring the cleanliness of the cooling water circuit in the heat exchanger 230 and reducing the scale formed by external impurities in the heat exchanger 230 and affecting the heat exchange.

[0075] In some implementation scenarios, Figure 2 Taking the dual-cold-source multi-split evaporative air-conditioning system shown in the figure as an example, its operating modes include evaporative cooling mode and air cooling mode. The specific examples are as follows:

[0076] 1.1. Evaporative cooling mode:

[0077] The first fan 261 is turned off, the cooling fan 110, the cooling water pump 120, and the intermediate water pump 291 are turned on, and the solenoid valve 270 is turned on according to the corresponding compressor 210.

[0078] The compressor 210 compresses the refrigerant into a high-temperature and high-pressure gas, which passes through the condenser 220, enters the heat exchanger 230 to release heat and condense into a liquid refrigerant, passes through the expansion valve 240 to throttle, then enters the evaporator 250 to evaporate into a refrigerant gas, and finally returns to the compressor 210 to complete the cycle;

[0079] The intermediate water pump 291 delivers water to each heat exchanger 230 for heat exchange. The water absorbs the condensation heat of the refrigerant in the heat exchanger 230 to increase its temperature, and then exchanges heat with the cooling water circuit in the evaporative cooling device 100 in the intermediate heat exchanger 290.

[0080] The cooling water pump 120 delivers low-temperature cooling water to the intermediate heat exchanger 290 to absorb heat and heat up, and then sprays it to the filler 140 through the water distribution mechanism 130. Under the action of the cooling fan 110, the water evaporates and exchanges heat with the air. The cooled water re-enters the intermediate heat exchanger 290 to complete the cycle.

[0081] 1.2, Air cooling mode:

[0082] The evaporative cooling device 100 is closed, the solenoid valve 270 is closed, and the first fan 261 is turned on. The refrigerant is condensed into liquid through the condenser 220 and enters the heat exchanger 230. Then, it is throttled through the expansion valve 240, and then enters the evaporator 250 to evaporate into refrigerant gas, and finally returns to the compressor 210 to complete the cycle. Among them, the heat exchanger 230 at this time is equivalent to the role of a liquid storage device.

[0083] See also Figure 3 , Figure 3 A flow chart of a control method provided in an embodiment of the present application, the control method is applied to Figure 1 or Figure 2 The control method of the dual-cold-source multi-connected evaporative air-conditioning system shown includes the following steps:

[0084] S100: obtaining a startup signal, where the startup signal is determined according to one or more of a compressor startup signal, compressor outlet pressure information, and compressor liquid pipe temperature information;

[0085] S200: Control the dual-cold-source multi-connected evaporative air-conditioning system to operate in an evaporative cooling mode according to a power-on signal, and turn on the evaporative cooling device in the evaporative cooling mode;

[0086] S300: When a fault is detected in the evaporative cooling device, the operation mode of the dual-cold-source multi-connected evaporative air-conditioning system is switched to an air-cooling mode, and the evaporative cooling device is turned off in the air-cooling mode.

[0087] Exemplarily, the dual-cold-source multi-split evaporative air-conditioning system is turned on according to a specific start-up signal, and the evaporative cooling mode is run by default, and the air cooling mode is enabled when the evaporative cooling device fails; thus, the dual-cold-source multi-split evaporative air-conditioning system can run both the evaporative cooling mode based on the evaporative cooling device and the air cooling mode based on the air cooling device. The evaporative cooling mode and the air cooling mode are backup for each other, which can improve the operating stability on the one hand, and reduce the system condensing temperature when running in the evaporative cooling mode on the other hand, thereby reducing the energy consumption of the unit.

[0088] Exemplarily, the control method further includes the following steps:

[0089] In the evaporative cooling mode, the cooling water pump is controlled by fixed frequency, and the intermediate water pump is controlled by variable frequency. The variable frequency control is determined according to the number of cooling water channels opened in the heat exchanger, the change rate of the cooling water channels opened, and the supply and return water temperature difference.

[0090] In evaporative cooling mode, the cooling fan is controlled according to the water temperature in the water tank in the evaporative cooling device.

[0091] In some implementation scenarios, Figure 2 As an example, the dual-cold-source multi-connected evaporative air-conditioning system shown in the figure is combined with Figure 3 The control method shown in the figure is as follows:

[0092] The evaporative cooling mode is operated by default. When the evaporative cooling device fails, such as the cooling fan 110 or the cooling water pump 120 fails, it automatically switches to the air cooling mode, and the corresponding valves operate according to the current mode;

[0093] 2.1. Startup logic of dual-cold-source multi-connected evaporative air-conditioning system:

[0094] Since the evaporative cooling device 100 is connected to a plurality of different air-cooling refrigeration systems, the start-up signal in the evaporative cooling mode is (satisfying any of the following conditions):

[0095] A. Any compressor 210 gives a start signal;

[0096] B. The pressure value P read by any pressure sensor 280 is greater than the Ps (preset pressure opening) value and lasts for a preset time (e.g., 3 seconds);

[0097] C. The liquid pipe temperature TL of any compressor 210 is greater than the TLs (preset liquid pipe opening) value for a preset time (e.g., 3s);

[0098] After receiving the power-on command, the machine will run in evaporative cooling mode by default, and detect whether the fan and water pump are faulty. If so, it will switch to air cooling mode; if not, it will start according to normal logic;

[0099] 2.2. Water pump control logic of dual cold source multi-connected evaporative air conditioning system:

[0100] 1) In the evaporative cooling mode, the cooling water pump 120 is at a fixed frequency. When a power-on command is received, the cooling water pump 120 is always on until a power-off command is received ( Figure 1 The control mode of the cooling water pump 120 shown is variable frequency, and reference may be made to the variable frequency control mode of the intermediate water pump 291);

[0101] 2) In the evaporative cooling mode, the intermediate water pump 291 is variable frequency, and the supply and return water temperature difference and the terminal valve are used for joint control, and the control is as follows:

[0102] ① After receiving the start-up command, the intermediate water pump 291 operates according to the opening number n of the solenoid valve 270, and the initial frequency of the water pump = n / N*50hz, where N is the total number of solenoid valves corresponding to the dual-cold-source multi-connected evaporative air-conditioning system. It runs for a preset time period at the initial frequency and then enters the next step of energy adjustment control; optionally, a minimum limit frequency can be set;

[0103] ② According to the supply and return water temperature difference and the periodic solenoid valve opening change rate, the intermediate water pump 291 is adjusted, and the adjustable control is as follows:

[0104]

[0105] Table 1- Energy regulation control table of intermediate water pump

[0106] Among them, T 目 is the target supply and return water temperature difference, T 实 is the actual supply and return water temperature difference, D is the control accuracy (adjustable, default is 0.2);

[0107] VT is the rate of change between the number of solenoid valves opened in the current cycle and the number of solenoid valves opened in the previous cycle. The calculation formula is:

[0108] (n 本 -n 上 ) / n 上 ;

[0109] Among them, n 本 The number of solenoid valves opened in the current cycle, n 上 The number of solenoid valve openings in the previous cycle; see Figure 4 , Figure 4Schematic diagram of the combined control of the supply and return water temperature difference and valve components provided in the embodiment of the present application; wherein, a first temperature sensor 281 and a second temperature sensor 282 are respectively provided at the water outlet and the water inlet of the second intermediate cooling water flow channel of the intermediate heat exchanger 290, the supply water temperature is detected by the first temperature sensor 281, and the return water temperature is detected by the second temperature sensor 282, and the difference between the supply water temperature and the return water temperature is the actual supply and return water temperature difference; the controller 283 is electrically connected to the intermediate water pump 291, so that the frequency conversion regulation of the intermediate water pump 291 is controlled by the controller 283;

[0110] 2.3. Cooling fan control logic of dual cold source multi-connected evaporative air conditioning system:

[0111] After the cooling fan 110 is started, it runs at a rated frequency for a period of time, and then the cooling fan 110 is controlled according to the cooling water temperature of the water tank 150 in the evaporative cooling device 100. The adjustable control example is as follows:

[0112]

[0113] Table 2-Cooling fan energy control table

[0114] Among them, CWT is the actual cooling water temperature of the water tank 150; LCWT is the low value of the cooling water temperature, which can be set; HCWT is the high value of the cooling water temperature, which can be set; WD is the cooling water control accuracy, which can be set.

[0115] 2.4. Overall control method in air cooling mode:

[0116] When the cooling fan 110 and the cooling water pump 120 of the evaporative cooling device 100 are turned off, the solenoid valve 270 is closed, and the first fan 261 is energy-adjustable and controlled according to the pressure value detected by the pressure sensor 280:

[0117]

[0118]

[0119] Table 3-Capacity adjustment control table of the first fan

[0120] Among them, CP is the actual pressure value detected by the pressure sensor 280; LCP is the low value of high pressure, which can be set; HCP is the high value of high pressure, which can be set; LD is the control accuracy, which can be set.

[0121] Exemplarily, the dual-cold-source multi-connected evaporative air-conditioning system provided in the embodiment of the present application has at least the following beneficial effects:

[0122] 1. The evaporative cooling mode and the air cooling mode serve as backup for each other, which improves the operation stability. When the evaporative cooling mode is in operation, the system condensing temperature can be lowered, and the energy consumption of the unit can be reduced;

[0123] 2. The cooling water pump adopts the combined control method of supply and return water temperature difference and valve components, which can solve the problem of insufficient water at the farthest end caused by single supply and return water temperature difference control.

[0124] In all the embodiments of the present application, "big" and "small" are relative, "more" and "less" are relative, and "up" and "down" are relative. The expressions of such relative terms are not elaborated in the embodiments of the present application.

[0125] It should be understood that the "in this embodiment", "in the embodiment of the present application" or "as an optional implementation" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "in this embodiment", "in the embodiment of the present application" or "as an optional implementation" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. Those skilled in the art should also be aware that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required for the present application.

[0126] In the various embodiments of the present application, it should be understood that the size of the serial numbers of the above-mentioned processes does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0127] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A dual-cold-source multi-connected evaporative air-conditioning system, characterized in that: including an evaporative cooling device and a plurality of air-cooled refrigeration devices; The evaporative cooling device is provided with a water outlet and a water inlet; The multiple air-cooled refrigeration devices are connected in parallel, and the air-cooled refrigeration devices include a compressor, a condenser, a heat exchanger, an expansion valve, and an evaporator. The heat exchanger is provided with a refrigerant flow channel and a cooling water flow channel, and the refrigerant flow channel and the cooling water flow channel are matched. The refrigerant outlet end of the compressor, the condenser, the refrigerant flow channel of the heat exchanger, the expansion valve, the evaporator, and the refrigerant inlet end of the compressor are connected in sequence, and the cooling water flow channel of the heat exchanger is matched with the water outlet and water inlet of the evaporative cooling device, respectively.

2. The dual cold source multi-connected evaporative air conditioning system according to claim 1, characterized in that: The evaporative cooling device includes a cooling fan, a cooling water pump, a water distribution mechanism, a filler and a water tank. The water distribution mechanism is matched with the filler. The cooling fan, the filler and the water tank are arranged in sequence from top to bottom. The cooling water pump is connected to the water tank. The water distribution mechanism and the cooling water pump are respectively connected to the cooling water flow channel of the heat exchanger.

3. The dual-cold-source multi-connected evaporative air-conditioning system according to claim 1, characterized in that: The air-cooled refrigeration device also includes an intermediate heat exchanger, which is provided with a first intermediate cooling water flow channel and a second intermediate cooling water flow channel. The first intermediate cooling water flow channel and the second intermediate cooling water flow channel are matched and arranged, wherein the first intermediate cooling water flow channel is connected to the water outlet and the water inlet of the evaporative cooling device, and the second intermediate cooling water flow channel is connected to the cooling water flow channel of the heat exchanger.

4. The dual-cold-source multi-connected evaporative air-conditioning system according to claim 3, characterized in that: The evaporative cooling device includes a cooling fan, a cooling water pump, a water distribution mechanism, a filler and a water tank. The water distribution mechanism is matched with the filler. The cooling fan, the filler and the water tank are arranged in sequence from top to bottom. The cooling water pump is connected to the water tank. The air-cooled refrigeration device also includes an intermediate water pump. The water distribution mechanism and the cooling water pump are respectively connected to the first intermediate cooling water flow channel. The cooling water flow channel of the heat exchanger is respectively connected to the intermediate water pump and the second intermediate cooling water flow channel.

5. The dual-cold-source multi-connected evaporative air-conditioning system according to claim 1, characterized in that: The air-cooled refrigeration device also includes a first fan, which is matched with the condenser.

6. The dual-cold-source multi-connected evaporative air-conditioning system according to claim 1 or 5, characterized in that: The air-cooled refrigeration device also includes a second fan, which is matched with the evaporator.

7. The dual-cold-source multi-connected evaporative air-conditioning system according to claim 1, characterized in that: The air-cooled refrigeration device further comprises a solenoid valve, which is arranged in the cooling water flow channel of the heat exchanger.

8. The dual-cold-source multi-connected evaporative air-conditioning system according to claim 1, characterized in that: The air-cooled refrigeration device further includes a pressure sensor, which is arranged at the outlet end of the compressor.

9. The dual-cold-source multi-connected evaporative air-conditioning system according to claim 1, characterized in that: The heat exchanger is a shell and tube heat exchanger.

10. The dual-cold-source multi-connected evaporative air-conditioning system according to claim 1, characterized in that: The condenser is an air-cooled condenser.

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