Water system of multi-connected air-cooled air conditioner and control method of water system

Abstract

The invention discloses a multi-connected air-cooled air conditioner water system and a control method thereof.The water system comprises a water supply pipeline, at least one wet film assembly and a water pump, the water supply pipeline comprises a first pipeline section, a second pipeline section and at least one third pipeline section, the third pipeline section is connected to the second pipeline section, and the first pipeline section is connected with the second pipeline section; a plurality of water outlet holes are formed in the third pipeline section; the wet film assemblies are at least partially located on the lower portions of the corresponding third pipeline sections and are arranged close to the heat dissipation surfaces of heat exchangers of the corresponding multi-connected air-cooled air conditioners. The water pump is connected with the first pipeline. The control method comprises the steps that when the feedback rotating speed of the fan reaches 100% and the condensing pressure reaches a high alarm value, the water pump is started to operate; and / or when the feedback rotating speed of the fan reaches the preset starting rotating speed, the water pump is started to operate. The heat exchange efficiency of the heat exchanger is improved, energy consumption is reduced, and the requirements for energy conservation, emission reduction and environmental protection of the data center are met.

Description

Technical Field

[0001] The present invention relates to the technical field of energy-saving air conditioning cooling and temperature reduction in data centers, and in particular to a water system of a multi-connected air-cooled air conditioner and a control method thereof. Background Art

[0002] The increasing demand for energy conservation, emission reduction and green environmental protection around the world has put forward higher requirements for the construction and operation of data centers, which consume the most energy in the IT industry. Reducing the PUE value of data centers has become the primary demand of owners and designers and builders.

[0003] The outdoor unit of the multi-split air-cooled air conditioner used in the data center transfers heat to the air side through the heat exchanger, and achieves the heat exchange effect with the phase change of the refrigerant, thereby realizing the heat transfer in the entire refrigeration cycle. However, in actual applications, there are usually problems such as dense unit layout and high ambient temperature in summer, which greatly reduces the heat exchange efficiency of the unit heat exchanger, increases energy consumption, and causes the PUE value of the data center to be high. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides a water system of a multi-split air-cooled air conditioner and a control method thereof, which solves the technical problem that the heat exchanger of the multi-split air-cooled air conditioner used in the existing data center has low heat exchange efficiency and high energy consumption, resulting in a high PUE value of the data center. The present application improves the heat exchange efficiency of the heat exchanger, reduces energy consumption, and meets the requirements of energy conservation, emission reduction and green environmental protection of the data center.

[0005] The present application provides a water system for a multi-split air-cooled air conditioner, which is used to improve the heat exchange efficiency of a heat exchanger of the multi-split air-cooled air conditioner, and the water system comprises: a water supply pipeline, comprising a first pipeline section, a second pipeline section, and at least one third pipeline section, the second pipeline section extends along a first direction, the third pipeline section is connected to the second pipeline section and extends along a second direction, and the second direction is perpendicular to the first direction; the first pipeline section is connected to the second pipeline section and is configured to transport cooling water to each of the third pipeline sections; wherein the third pipeline section is provided with a plurality of water outlet holes arranged at intervals along the second direction; at least one wet membrane component, which is at least partially located at the lower part of the corresponding third pipeline section in the gravity direction and is arranged close to the heat dissipation surface of the corresponding heat exchanger of the multi-split air-cooled air conditioner; wherein each of the third pipeline sections is provided with at least one wet membrane component; and a water pump, which is connected to the first pipeline section and is used to pump cooling water into the water supply pipeline.

[0006] In some embodiments, the water system also includes: at least one water receiving container, arranged at the lower part of the corresponding wet membrane assembly in the direction of gravity, and configured to receive the cooling water dripping from the wet membrane assembly; a circulating water tank, used to store cooling water, the water outlet end of the circulating water tank is connected to the water pump; a return water pipeline, connecting all the water receiving containers with the water inlet end of the circulating water tank, and configured to divert the condensed water collected in the water receiving containers back to the circulating water tank.

[0007] In some embodiments, the volume V of the circulating water tank satisfies the following relationship: V=Q*T1, wherein Q is the working flow of the water pump, T1 is the preset cycle time, and the preset cycle time is between 2 and 4 minutes.

[0008] In some embodiments, the second direction is inclined at a first preset angle to the horizontal plane, so that the cooling water in the third pipeline section flows from one end to the other end under the action of gravity.

[0009] In some embodiments, the water supply pipeline also includes: at least one fourth pipeline section, the fourth pipeline section including a fourth water inlet end and at least two fourth water outlet ends, wherein the fourth water inlet end is connected to the second pipeline section, and each of the fourth water outlet ends is connected to one of the third pipeline sections.

[0010] In some embodiments, the wet film assembly includes: a fixed bracket, detachably connected to the corresponding heat dissipation surface of the heat exchanger; at least one wet film, limited to the fixed bracket and parallel to the heat dissipation surface of the heat exchanger; wherein, the wet film has a second preset inclination angle with the vertical plane, so that at least part of the wet film can move against the fixed bracket under the action of gravity.

[0011] In some embodiments, the number of wet films set is N, when 0<N≤4, the diameter D1 of the first pipeline section, the diameter D2 of the second pipeline section, and the diameter D3 of the third pipeline section satisfy the following relationship: D1=D2=D3; when 4<N≤10, the diameter D1 of the first pipeline section, the diameter D2 of the second pipeline section, and the diameter D3 of the third pipeline section satisfy the following relationship: D3<D1≤D2, and D2=2*D3.

[0012] In some embodiments, the diameter of the water outlet holes is between 2 and 4 mm, and the distance between two adjacent water outlet holes is between 35 and 45 mm.

[0013] In some embodiments of the present application, a control method for a water system of a multi-split air-cooled air conditioner is provided, wherein the water system is the water system described in any one of the above items, and the multi-split air-cooled air conditioner is the multi-split air-cooled air conditioner described in any one of the above items; the multi-split air-cooled air conditioner comprises the heat exchanger described in any one of the above items, and a fan, wherein the fan is configured to enable airflow to flow between the heat dissipation surface of the heat exchanger and the corresponding wet membrane assembly to achieve heat exchange; wherein the control method comprises: when the ambient temperature T is higher than the preset water system start-up temperature Tset, if the water system is in a water-saving mode, then when the feedback speed Sfb of the fan reaches 100%, the condensation pressure Pc reaches the condensation pressure high alarm value Pha, and the water system is in a wet working state and there is no abnormality, the water pump is started to run; and / or, when the ambient temperature T is higher than the preset water system start-up temperature Tset, if the water system is in an energy-saving mode, and the water pump is not started, then when the feedback speed Sfb of the fan reaches the preset start-up speed Sset, and the water system is in a wet working state and there is no abnormality, the water pump is started to run.

[0014] In some embodiments, the method for starting the water pump includes: within the first 3 minutes of the water pump's operation, the water pump is turned on for 5 seconds and off for 15 seconds, and the cycle continues until the running time reaches 3 minutes; within the 3rd to 7th minutes of the water pump's operation, the water pump is turned on for 10 seconds and off for 10 seconds, and the cycle continues until the running time reaches 7 minutes; within the 7th to 10th minutes of the water pump's startup, the water pump is turned on for 15 seconds and off for 5 seconds, and the cycle continues until the running time reaches 10 minutes; after 10 minutes of the water pump's operation, the water pump remains normally on.

[0015] The water system of the multi-split air-cooled air conditioner provided in the present application effectively reduces the ambient temperature of the air side of the heat dissipation surface of the heat exchanger of the multi-split air-cooled air conditioner, so that the high-temperature steam in the fin coil of the heat exchanger can fully exchange heat with the cooled air on the air side of the heat dissipation surface, thereby achieving the cooling effect and significantly improving the heat exchange efficiency of the heat exchanger and reducing the energy consumption of the multi-split air-cooled air conditioner, which is beneficial to reducing the PUE value of the data center and meeting the requirements of energy conservation, emission reduction and green environmental protection of the data center.

[0016] In addition, in combination with the control method provided by the present application, when the ambient temperature is higher than the preset water system start-up temperature, if the water system is in the water-saving mode, the water pump will be allowed to start only when the feedback speed of the fan of the multi-split air-cooled air conditioner reaches 100% and the condensing pressure reaches the high alarm value, thereby avoiding the waste of resources caused by starting the water system when the multi-split air-cooled air conditioner is running at low load, and the water-saving effect is better. Moreover, when the ambient temperature is higher than the preset water system start-up temperature, if the water system is in the energy-saving mode and the water pump is not started, the water pump will be allowed to start only when the feedback speed of the fan of the multi-split air-cooled air conditioner reaches the preset start-up speed, which can be well combined with the use requirements of the multi-split air-cooled air conditioner, accurately control the start and stop actions of the water system, and achieve better energy-saving effects.

[0017] After adopting the technical solution of the present application, the multi-split air-cooled air conditioner used in the data center can better adapt to the high temperature environment in summer, improve the heat exchange efficiency of the heat exchanger, reduce energy consumption, and reduce the PUE value of the data center to below 2, meeting the requirements of energy conservation, emission reduction and green environmental protection of the data center. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The technical solution of the present application will be further described below in conjunction with the accompanying drawings and embodiments, in which:

[0019] Figure 1 This is a schematic diagram of the structure of an embodiment of the water system of the present application installed in an outdoor unit of a multi-split air-cooled air conditioner;

[0020] Figure 2 It is a partial structural schematic diagram of one embodiment of the water system of the present application, wherein the second pipe section of the water supply pipe distributes water from the middle to both ends;

[0021] Figure 3 It is a partial structural schematic diagram of one embodiment of the water system of the present application, wherein the second pipe section of the water supply pipe distributes water from its left end to the right end;

[0022] Figure 4 It is a partial structural schematic diagram of one embodiment of the water system of the present application, wherein the second pipe section of the water supply pipe distributes water from its right end to the left end;

[0023] Figure 5 This is a schematic diagram of the structure of the third pipe section in one embodiment of the water system of the present application;

[0024] Figure 6 It is a structural schematic diagram of one embodiment of the water system of the present application, in which a wet membrane module is installed in an outdoor unit of a multi-split air-cooled air conditioner;

[0025] Figure 7 yes Figure 6A magnified schematic diagram of the local structure at S1 in the middle;

[0026] Figure 8 yes Figure 6 A magnified schematic diagram of the local structure at S2 in the middle;

[0027] Fig. 9 yes Figure 6 A magnified schematic diagram of the local structure at S3 in the middle;

[0028] Fig.10 It is a control logic block diagram of one implementation method of the water system control method of the present application.

[0029] The reference numerals are as follows:

[0030] 1-heat exchanger, 11-heat dissipation surface;

[0031] 2-water supply pipeline, 21-first pipeline section, 22-second pipeline section, 23-third pipeline section, 231-water outlet, 24-fourth pipeline section, 241-fourth water inlet end, 242-fourth water outlet end;

[0032] 3-wet membrane assembly, 31-fixed bracket, 311-side bracket, 3111-third baffle, 3112-third folded edge A, 3113-third folded edge B, 312-upper bracket, 3121-second baffle, 3122-second folded edge A, 3123-second folded edge B, 313-lower bracket, 3131-first baffle, 3132-first folded edge A, 3133-first folded edge B, 3134-drain port, 314-threaded fastener, 315-quick release fastener, 32-wet membrane, 321-end bracket;

[0033] 4-water pump; 5-water receiving container, 6-circulating water tank, 7-return water pipeline, 8-frame, 9-fan. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the technical solution of the present invention is further described in detail below through specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0035] See also Figure 1 and Figure 2 The present application provides a water system for a multi-split air-cooled air conditioner, which is used to improve the heat exchanger 1 (such as Figure 1 The water system comprises: a water supply pipeline 2, at least one wet membrane module 3, and a water pump 4. The water supply pipeline 2 comprises a first pipeline section 21, a second pipeline section 22, and at least one third pipeline section 23 (as shown in Figure 2), the second pipeline section 22 extends along the first direction, and the third pipeline section 23 is connected to the second pipeline section 22 and extends along the second direction, and the second direction is perpendicular to the first direction. The first pipeline section 21 is connected to the second pipeline section 22, and the first pipeline section 21 is configured to transport cooling water to each third pipeline section 23 through the second pipeline section 22. Among them, the third pipeline section 23 is provided with a plurality of water outlet holes 231 (as shown in FIG. 1 ) arranged at intervals along the second direction. Figure 5 ).

[0036] The wet membrane assembly 3 is at least partially located at the lower part of the corresponding third pipe section 23 in the gravity direction and close to the heat dissipation surface 11 (such as Figure 6 Each third pipe section 23 is provided with at least one corresponding wet membrane assembly 3. The water outlet 231 can be directly opened on the third pipe section 23 and arranged toward the corresponding wet membrane assembly 3.

[0037] The water pump 4 is connected to the first pipeline section 21 and is used to pump cooling water into the water supply pipeline 2 .

[0038] When in use, the water pump 4 pumps cooling water into the water supply pipeline 2. The cooling water enters each third pipeline section 23 respectively under the transportation of the first pipeline section 21 and the second pipeline section 22, and then is sprayed to the corresponding wet membrane assembly 3 through each water outlet 231 under the pressure of the water pump 4, so as to achieve the wetting of the wet membrane assembly 3.

[0039] The water system of the multi-split air-cooled air conditioner provided in the present application pumps cooling water into the water supply pipeline 2 through the water pump 4, and then sprays the cooling water onto the corresponding wet membrane assembly 3 through a plurality of water outlet holes 231 arranged at intervals on at least one third pipe segment. When the cooling water evaporates due to the action of the airflow, the moistened wet membrane assembly 3 can take away a large amount of heat, thereby effectively reducing the ambient temperature on the air side of the heat dissipation surface 11 of the corresponding heat exchanger 1, so that the high-temperature steam in the fin coil of the heat exchanger 1 can fully exchange heat with the cooled air on the air side of the heat dissipation surface 11, thereby achieving the cooling effect, significantly improving the heat exchange efficiency of the heat exchanger 1, reducing the energy consumption of the multi-split air-cooled air conditioner, and being beneficial to reducing the PUE value of the data center, thereby meeting the requirements of energy conservation, emission reduction and green environmental protection of the data center.

[0040] The present application sprays cooling water onto the corresponding wet membrane assembly 3 through a plurality of water outlet holes 231 arranged at intervals on the third pipe section. The structure is simple and not easy to be blocked. Compared with the cooling method of using a nozzle to directly spray cooling water onto the fins of the heat exchanger 1, the electrochemical corrosion of the fins of the heat exchanger 1 is avoided, and the structural complexity, manufacturing cost and failure rate of the water system are significantly reduced. In addition, cooling water is centrally supplied to each third pipe section 23 through the first pipe section 21 and the second pipe section 22, so that the water supply pipeline 2 as a whole can produce a better water distribution effect, ensuring the effective wetting of each wet membrane assembly 3.

[0041] To facilitate readers' understanding of the technical solution of the present application, the first direction in which the second pipeline section 22 extends is defined as the X-axis, the second direction in which the third pipeline section 23 extends is defined as the Y-axis, and the direction in which the first pipeline section 21 extends is defined as the Z-axis, where the Z-axis takes the direction of gravity as an example.

[0042] The second pipe section 22 can be set to extend along the X-axis direction, i.e., the first direction, on the horizontal plane, and the third pipe section 23 can be set to extend along the Y-axis direction, i.e., the second direction, on the horizontal plane. The length of the second pipe section 22 extending along the first direction, the length of the third pipe section 23 extending along the second direction, and the number of third pipe sections 23, etc., can be adjusted accordingly according to the number of heat exchangers 1 set and the layout form of the multi-split air-cooled air-conditioning outdoor unit, to ensure that the air side of the heat dissipation surface 11 of each heat exchanger 1 of the multi-split air-cooled air-conditioning outdoor unit can correspond to at least one wet film assembly 3, and each wet film assembly 3 can correspond to a third pipe section 23 to achieve wetting, and this application does not limit this.

[0043] The width direction of the wet membrane assembly 3 is consistent with the Y-axis direction, that is, the second direction. When a plurality of wet membrane assemblies 3 are arranged corresponding to the lower part of the weight direction of the same third pipeline section 23, the plurality of wet membrane assemblies 3 are arranged "shoulder to shoulder" along the width direction to ensure that the cooling water in the third pipeline section 23 can be sprayed onto the corresponding wet membrane assembly 3 through the corresponding water outlet holes 231 to achieve wetting. It can be understood that only one wet membrane assembly 3 can be arranged corresponding to the lower part of the gravity direction of the same third pipeline section 23, and this application does not limit this, and it can be set accordingly according to the actual situation of the multi-split air-cooled air-conditioning outdoor unit.

[0044] In order to ensure the cooling effect of the wet membrane component 3 on the air side of the heat dissipation surface 11 of the heat exchanger 1 of the multi-split air-cooled air conditioner, the wet membrane component 3 is preferably arranged parallel to the corresponding heat dissipation surface 11 of the heat exchanger 1, and a certain gap is left between the two to allow air flow to pass through the gap between the two, thereby achieving rapid cooling of the air side of the heat dissipation surface 11 of the heat exchanger 1.

[0045] The third pipeline section 23 is preferably plugged and fixed along the width direction to the upper end of the corresponding wet membrane assembly 3 in the direction of gravity, so that the water outlet 231 can be buried in the corresponding wet membrane assembly 3, ensuring that the cooling water discharged from the water outlet 231 can be sprayed to the corresponding wet membrane assembly 3, thereby reducing the loss of cooling water.

[0046] See also Figure 1 In some embodiments, the water system further includes at least one water receiving container 5, a circulating water tank 6, and a water return pipeline 7. The water receiving container 5 is disposed at the lower part of the corresponding wet membrane assembly 3 in the direction of gravity, and is configured to receive cooling water dripping from the wet membrane assembly 3. The circulating water tank 6 is used to store cooling water, and the water outlet of the circulating water tank 6 is connected to the water pump 4 to supply cooling water to the water supply pipeline 2. The water return pipeline 7 connects all the water receiving containers 5 with the water inlet of the circulating water tank 6, and is configured to guide the condensed water collected in the water receiving container 5 back to the circulating water tank 6.

[0047] The number of water receiving containers 5 is preferably matched with the number of third pipeline sections 23, that is, a water receiving container 5 is correspondingly arranged at the lower end in the gravity direction of each third pipeline section 23. The water receiving chamber is preferably arranged to extend along the second direction, so that the cooling water dripping from all the wet membrane modules 3 corresponding to each third pipeline section 23 can be uniformly recovered through the corresponding water receiving containers 5, while ensuring the recovery rate of cooling water, reducing the number of water receiving containers 5, which is conducive to the compact arrangement of the water supply pipeline 2, wet membrane module 3, and return pipeline 7 of the water system on the outdoor unit of the multi-split air-cooled air conditioner, saving space.

[0048] The circulating water tank 6 provides a water source for the entire water system. At the same time, the cooling water that has passed through the wet membrane assembly 3 but has not been evaporated is collected through the water receiving container 5 and the return water pipeline 7, which plays the role of storing and supplying cooling water and recovering the cooling water dripping from the wet membrane assembly 3, thereby ensuring the economic efficiency of the water circulation of the water system. In order to ensure that the recovered cooling water can automatically flow back under the action of gravity, the circulating water tank 6 is preferably set at the lowest point in the weight direction of the water system, and the water inlet end of the circulating water tank 6 is preferably set at the high point in the gravity direction of the circulating water tank 6. The return water pipeline 7 serves to connect all the water receiving containers 5 with the circulating water tank 6, and returns the collected cooling water to the circulating water tank 6, so that the cooling water can circulate in the water system.

[0049] After the water pump 4 is started, the cooling water in the circulating water tank 6 is pumped into the first pipeline section 21 and the second pipeline section 22 in sequence, and is respectively transported to each third pipeline section 23 under the guidance of the second pipeline section 22 and the fourth pipeline section 24. The water pipes used in the water supply pipeline 2 and the return pipeline 7 are all national standard water pipes, preferably U-PVC material water pipes, which have the advantages of light weight and corrosion resistance, and small water flow resistance, which is conducive to reducing the energy consumption of the water pump 4.

[0050] In some embodiments, the first pipeline section 21 preferably extends vertically along the Z-axis, that is, the direction of gravity, and the second pipeline section 22 is preferably connected to the upper end of the first pipeline section 21 in the direction of gravity. After the water pump 4 stops working, the liquid water in the water supply pipeline 2 will flow back to the circulating water tank 6 through the vertically arranged first pipeline section 21 under the action of gravity, thereby avoiding water accumulation in the water supply pipeline 2 and causing the water pipe to freeze and crack under low temperature conditions in winter.

[0051] In some embodiments, the volume V of the circulating water tank 6 satisfies the following relationship: V=Q*T1, wherein Q is the working flow of the water pump 4, and T1 is the preset cycle time, which is between 2 and 4 minutes. Preferably, the preset cycle time defaults to 3 minutes, that is, V=3Q(L). The value of Q can be determined based on the flow head curve of the water pump 4, and the volume V of the circulating water tank 6 is set to Q*T1(L), so that the circulating water tank 6 has the minimum economic volume, which ensures the economy of the cooling water circulation in the water system and avoids the waste of water resources.

[0052] In some embodiments, the second direction is at a first preset inclination angle α1 (not shown) with the horizontal plane, so that the cooling water in the third pipe section 23 flows from one end to the other end under the action of gravity. The first preset inclination angle α1 can be set between 0° and 30°, preferably between 3° and 10°.

[0053] In order to allow the cooling water in the third pipeline section 23 to automatically flow to the corresponding wet membrane assembly 3 under the action of gravity, the water outlet 231 is preferably arranged at the lower end of the third pipeline section 23 in the gravity direction and opened toward the wet membrane assembly 3.

[0054] The second direction forms a first preset inclination angle α1 with the horizontal plane, so that the third pipeline section 23 as a whole is inclined with one end high and the other end low. After being installed on the outdoor unit of the multi-split air-cooled air conditioner in this inclined posture, the third pipeline section 23 has a certain slope in the axial direction, and the cooling water in the third pipeline section 23 can spontaneously flow from a relatively high end to a relatively low end under the action of gravity. The cooling water in the third pipeline section 23 can be automatically discharged from the corresponding water outlet 231 during the spontaneous flow process, which ensures the wetting effect on the wet membrane component 3 while avoiding water accumulation in the third pipeline section 23 after the water pump 4 is shut down, and can prevent the third pipeline section 23 from freezing and cracking due to water accumulation during low temperatures in winter.

[0055] See also Figure 2In some embodiments, the water supply pipeline 2 further includes at least one fourth pipeline section 24, and the fourth pipeline section 24 includes a fourth water inlet end 241 and at least two fourth water outlet ends 242, wherein the fourth water inlet end 241 is connected to the second pipeline section 22, and each fourth water outlet end 242 is connected to a third pipeline section 23. The water supply pipeline 2 in this embodiment is described by taking five fourth pipeline sections 24 as an example, and the fourth water inlet ends 241 of the five fourth pipeline sections 24 are connected to the second pipeline section 22 at intervals along the first direction. The fourth pipeline section 24 takes a three-way structure as an example, and has two fourth water outlet ends 242.

[0056] The two third pipeline sections 23 connected to the same fourth pipeline section 24 are a group, so that the two third pipeline sections 23 in the same group can be arranged corresponding to the same group of multiple heat exchangers 1 of the multi-split air-cooled air-conditioning outdoor unit, which is beneficial to the compact arrangement of different groups of third pipeline sections 23 of the water supply pipeline 2 on the outdoor unit of the multi-split air-cooled air-conditioning, and realizes the cooling water distribution of different groups of third pipeline sections 23 of the water supply pipeline 2.

[0057] The diameter of the fourth pipeline section 24 is preferably consistent with the diameter of the third pipeline section 23 , so that the cooling water in the water supply pipeline 2 can be evenly distributed to each third pipeline section 23 .

[0058] The water inlet of the first pipe section 21 can be connected to the water outlet of the water pump 4 through corresponding joints and water pipes, and the water outlet of the first pipe section 21 can be connected to the water inlet of the second pipe section 22 through corresponding joints. The second pipe section 22 can be provided with one water inlet and at least one water outlet, and the cooling water transported by the first pipe section 21 is distributed to each water outlet via the water inlet of the second pipe section 22. The water inlet of the third pipe section 23 can be connected to the corresponding water outlet of the second pipe section 22 through the corresponding fourth pipe section 24, and the tail end of the third pipe section 23 away from its water inlet can be blocked by a plug, so that the cooling water in the third pipe section 23 is discharged outward through the water outlet hole 231.

[0059] See also Figure 6 In some embodiments, the wet film assembly 3 includes a fixed bracket 31 and at least one wet film 32. The fixed bracket 31 is detachably connected to the heat dissipation surface 11 of the corresponding heat exchanger 1. The wet film 32 is limited to the fixed bracket 31 and is parallel to the heat dissipation surface 11 of the heat exchanger 1. The wet film 32 is inclined at a second preset angle α2 (such as Figure 1 ), so that at least a portion of the wet film 32 is movable against the fixed support 31 under the action of gravity.

[0060] The wet film 32 and the vertical surface form a preset second inclination angle α2, so that the wet film 32 can be tilted toward the side away from the heat dissipation surface 11 of the heat exchanger 1 under the action of gravity, until at least part of the wet film 32 is in contact with the fixed bracket 31, so as to limit the wet film 32 and make the wet film 32 parallel to the heat dissipation surface 11 of the heat exchanger 1. This structural design enables the wet film 32 to be connected to the heat dissipation surface 11 of the corresponding heat exchanger 1 of the multi-connected air-cooled air-conditioning outdoor unit in a non-rigid fixed manner, and the design of the wet film 32 tilting toward the side away from the heat dissipation surface 11 of the heat exchanger 1 also ensures that there is a gap between the wet film 32 and the heat dissipation surface 11 of the heat exchanger 1 for air flow to pass through, so that after the wet film 32 is wetted by cooling water, the temperature of the air side of the heat dissipation surface 11 of the heat exchanger 1 can be reduced by absorbing heat through the evaporation of the cooling water.

[0061] The fixing bracket 31 is detachably connected to the heat dissipation surface 11 of the corresponding heat exchanger 1 , and the user can remove the wet film 32 for replacement or cleaning by disassembling the fixing bracket 31 , which is convenient for use and maintenance.

[0062] Each wet film assembly 3 can be provided with only one wet film 32, or multiple wet films 32 can be provided at the same time; the air side of the heat dissipation surface 11 of each heat exchanger 1 of the multi-split air-cooled air conditioner can be arranged with a corresponding wet film 32, or multiple wet films 32 can be arranged at the same time; the present application does not limit this, and ensures that at least one wet film 32 is arranged on the air side of the heat dissipation surface 11 of each heat exchanger 1, and that the air side of the heat dissipation surface 11 of the heat exchanger 1 can be effectively cooled by the wet film 32.

[0063] The top of the wet film 32 is provided with a through hole or a groove (not shown) along its width direction, i.e., the second direction, and the third pipeline section 23 is plugged into the corresponding upper end of the wet film 32 through the through hole or the groove, so that cooling water can be sprayed onto the upper end of the wet film 32 through the water outlet hole 231, and wet the entire wet film 32 under the action of gravity and the liquid absorption characteristics of the wet film 32 itself.

[0064] In some embodiments, the second preset inclination angle α2 can be set between 0° and 30°, preferably between 10° and 20°. Due to the existence of the second preset inclination angle α2, the wet film 32 tilts toward the side away from the heat dissipation surface 11 of the heat exchanger 1. Compared with the vertical arrangement of the wet film 32, the cooling water will not easily drip from the wet film 32, which increases the residence time of the cooling water on the wet film 32, ensures the cooling effect on the air side of the heat dissipation surface 11 of the heat exchanger 1, and reduces the waste of water resources. In addition, the wet film 32 tilts toward the side away from the heat dissipation surface 11 of the heat exchanger 1, which is beneficial to increase the area of ​​the relative arrangement of the wet film 32 and the heat dissipation surface 11 of the heat exchanger 1, and further improves the cooling effect on the air side of the heat dissipation surface 11 of the heat exchanger 1, compared with the vertical arrangement of the wet film 32.

[0065] See also Figures 6 to 9 In some embodiments, the fixed bracket 31 includes at least two side brackets 311, at least one upper bracket 312, and at least one lower bracket 313. The side brackets 311, the upper bracket 312, and the lower bracket 313 can be made by cutting Z-shaped steel of appropriate size.

[0066] The lower support 313 and the upper support 312 may be arranged to extend along the second direction, and the extension length may be smaller than the width of the wet film 32 or larger than the width of the wet film 32 . The present application does not impose any limitation on this, and it is sufficient that the wet film 32 can be stably limited.

[0067] See also Figure 7 The lower bracket 313 includes a first baffle 3131 in the middle, a first folded edge A3132 and a first folded edge B3133 vertically connected to both sides of the first baffle 3131 and folded in opposite directions, wherein the first folded edge A3132 is closely attached to the lower part of the heat dissipation surface 11 of the heat exchanger 1 along the second direction and is fixed by a threaded fastener 314, so that the first baffle 3131 is perpendicular to the heat dissipation surface 11 of the heat exchanger 1, and the first folded edge B3133 is parallel to the heat dissipation surface 11 of the radiator and folded toward the upper part of the gravity direction of the first baffle 3131. The bottom of the wet film 32 abuts against the first baffle 3131 and is at least partially stopped by the first folded edge B3133 to limit the bottom of the wet film 32.

[0068] The lower support 313 is preferably provided with a plurality of drain ports 3134, which can be provided only on the first baffle plate 3131, or simultaneously provided on at least one of the first baffle plate 3131, the first folded edge A 3132, and the first folded edge B 3133. During use, the cooling water on the wet film 32 can smoothly flow into the corresponding water receiving container 5 through the plurality of drain ports 3134, thereby realizing the recycling and reuse of the cooling water.

[0069] See also Figure 8The upper bracket 312 includes a second baffle 3121 in the middle, a second folded edge A3122 and a second folded edge B3123 vertically connected to both sides of the second baffle 3121 and folded in opposite directions, wherein the second folded edge A3122 is closely attached to the upper part of the heat dissipation surface 11 of the heat exchanger 1 along the second direction and is fixed by a threaded fastener 314, so that the second baffle 3121 is perpendicular to the heat dissipation surface 11 of the heat exchanger 1, and the second folded edge B3123 is parallel to the heat dissipation surface 11 of the radiator and folded in the gravity direction of the lower part of the second baffle 3121. The upper part of the wet film 32 abuts against the second baffle 3121, and due to the existence of the second preset inclination angle, the upper part of the wet film 32 is at least partially stopped by the second folded edge B3123 under the action of gravity, so as to limit the upper part of the wet film 32.

[0070] See also Fig. 9 The side bracket 311 includes a third baffle 3111 in the middle, a third folded edge A3112 and a third folded edge B3113 vertically connected to both sides of the third baffle 3111 and folded in opposite directions, wherein the third folded edge A3112 is closely attached to one side of the heat dissipation surface 11 of the heat exchanger 1 along the height direction and is fixed by a quick-release fastener 315 for easy disassembly and assembly, so that the third baffle 3111 is perpendicular to the heat dissipation surface 11 of the heat exchanger 1, and the third folded edge B3113 is parallel to the heat dissipation surface 11 of the radiator and folded to the inner side of the third baffle 3111. The side of the wet film 32 abuts against the third baffle 3111 and is at least partially stopped by the third folded edge B3113. The two side brackets 311 can be arranged opposite to each other on the left and right sides to achieve the limitation of the two sides of the wet film 32.

[0071] During use, the user can conveniently manually disassemble the quick-release fastener 315 to remove at least one side bracket 311, so that the user can directly pull the wet film 32 out of the fixed bracket 31 from one side, which is simple and convenient to operate.

[0072] The quick-release fastener 315 can be a quick-release fastener that can be a butterfly-shaped hand screw or a wing nut that cooperates with a bolt, or can be other types of quick-release fasteners such as quick-release threaded fasteners, quick-release locking pins, spring pull pins, etc.; the threaded fastener 314 used to fix the upper bracket 312 and the lower bracket 313 can also be set as any of the quick-release fasteners mentioned above, and the present application does not limit this, and can realize convenient disassembly and assembly of the fixed bracket 31 and convenient installation and disassembly of the wet film 32.

[0073] See also Figures 6 to 9In some embodiments, an end face bracket 321 is provided on the outer end face of the wet film 32 facing away from the heat dissipation surface 11 of the heat exchanger 1. The end face bracket 321 is composed of a plurality of strip baffles interlaced in longitude and latitude. The upper and lower ends of the end face bracket 321 can abut and be limited to the upper bracket 312 and the lower bracket 313, and the left and right ends of the end face bracket 321 can abut and be limited to the corresponding side bracket 311. The end face bracket 321 supports the wet film 32 from the outer end face, avoiding the problem that the middle of the wet film 32 is unsupported and the peripheral edge of the wet film 32 is partially separated from the fixed bracket 31, thereby ensuring the reliability of the fixed bracket to limit the wet film 32. In addition, the end face bracket 321 has multiple hollow areas, which does not affect the evaporation and heat absorption of the cooling water on the wet film 32.

[0074] In some embodiments, the number of wet membranes 32 set in the water system is N. When 0<N≤4, the diameter D1 of the first pipeline section 21, the diameter D2 of the second pipeline section 22, and the diameter D3 of the third pipeline section 23 satisfy the following relationship: D1=D2=D3.

[0075] When 4<N≤10, the diameter D1 of the first pipeline section 21, the diameter D2 of the second pipeline section 22, and the diameter D3 of the third pipeline section 23 satisfy the following relationship: D3<D1≤D2, and D2=2*D3.

[0076] The present application optimizes the matching relationship between the pipe diameters of the first pipe section 21, the second pipe section 22 and the third pipe section 23 of the water supply pipe 2 and the total number of wet membranes 32. When the number of wet membranes 32 is relatively small, the overall operating pressure of the system is small. At this time, the first pipe section 21, the second pipe section 22 and the third pipe section 23 are made of water pipes with the same diameter, which ensures the normal water supply of the water supply pipe 2 while reducing the water flow resistance and energy loss of each pipe section, which is beneficial to reducing the overall energy consumption of the water system.

[0077] When the number of wet films 32 is relatively large, it can be seen that the number of heat exchangers 1 of the outdoor unit of the multi-split air-cooled air conditioner is relatively large, and the requirements for the water system are relatively higher. At this time, the diameter of the third pipeline section 23 is set to be smaller than the diameter of the first pipeline section 21, the diameter of the first pipeline section 21 is set to be less than or equal to the diameter of the second pipeline section 22, and the diameter of the second pipeline section 22 is set to twice the diameter of the third pipeline section 23, so that the water supply pipeline 2 has better water transmission efficiency, achieves good cooling water distribution in a limited space and improves the uniformity of cooling water distribution, reasonably distributes the flow in the second pipeline section 22 to each branch third pipeline section 23, and makes the flow of each branch third pipeline section 23 stable and controllable, reduces the water hammer effect in the water supply pipeline 2, avoids the generation of turbulence, and enables the water supply pipeline 2 as a whole to produce excellent water distribution effect.

[0078] See also Figure 5In some embodiments, the diameter of the water outlet holes 231 on the third pipe section 23 is between 2 and 4 mm, and the distance between two adjacent water outlet holes 231 is between 35 and 45 mm.

[0079] During specific implementation, the third pipeline section 23 is preferably made of a U-PVC water pipe with a diameter of DN20 (outer diameter 25 mm). The extension length L of the third pipeline section 23 along the second direction can be set to 2000 mm. 45 water outlet holes 231 can be arranged at intervals along the second direction on the third pipeline section 23. The 45 water outlet holes 231 can be divided into two groups. The spacing L2 between the two groups of water outlet holes 231 can be set to 100 mm. The spacing L1 between two adjacent water outlet holes 231 in the same group can be set to 40 mm. The aperture of the water outlet hole 231 can be set to 3 mm.

[0080] The present application optimizes and improves the water distribution design of the wet membrane assembly 3 through the above-mentioned technical scheme, optimizes the pipe diameter of the third pipeline section 23, the number of openings of the water outlet holes 231, the hole spacing between the water outlet holes 231, the aperture of the water outlet holes 231, and the pipe diameter matching relationship among the first pipeline section 21, the second pipeline section 22 and the third pipeline section 23 in the water supply pipeline 2, so that the water supply pipeline 2 of the water system as a whole can produce an excellent water distribution effect, ensure the wetting effect on the wet membrane 32, improve the heat exchange efficiency of the heat exchanger 1 of the multi-split air-cooled air-conditioning outdoor unit, reduce power consumption, and help reduce the PUE value of the data center, meeting the requirements of energy conservation, emission reduction and green environmental protection of the data center.

[0081] In some embodiments, the water inlet end of the second pipe section 22 of the water supply pipe 2 can be set at any position of the left end, the right end, or the middle of its length. The first pipe section 21 of the water supply pipe 2 preferably extends in the vertical direction, with the lower end in the gravity direction as the water inlet end and the upper end as the water outlet end. Figure 3 As shown in , the water outlet end of the first pipe section 21 can be connected to the left end of the second pipe section 22. At this time, the left end of the second pipe section 22 is the water inlet end, and water is distributed from the left end to the right end in its length direction; Figure 4 As shown in , the water outlet end of the first pipe section 21 can also be connected to the right end of the second pipe section 22. In this case, the right end of the second pipe section 22 is the water inlet end, and water is distributed from the right end to the left end in its length direction; Figure 2 As shown in , the water outlet of the first pipeline section 21 can also be connected to the middle of the second pipeline section 22. In this case, the middle of the second pipeline section 22 is the water inlet, and water is distributed from the middle to both ends. The second pipeline section 22 has excellent water distribution effects by using these three water distribution methods, and can realize efficient water supply of the water supply pipeline in a limited space, effectively improving the uniformity of water distribution of each wet membrane 32.

[0082] See also Figure 1 and Figure 6 In some embodiments, the outdoor unit of the multi-split air-cooled air conditioner includes five frames 8 arranged in parallel along a first direction, and a group of heat exchangers 1 arranged in a V shape are fixedly connected on both sides of each frame 8. A preset second inclination angle α2 is formed between the heat exchanger 1 and the vertical plane, so that the heat exchanger 1 is tilted toward the outside of the frame 8.

[0083] The second pipe section 22 of the water supply pipeline 2 is arranged at the upper part of one end of the frame 8 along the first direction, and the third pipe section 23 of the water supply pipeline 2 is taken as an example. The ten third pipe sections 23 are divided into five groups, each of which is two and is respectively connected to the second pipe section 22 through the fourth pipe section 24 of the three-way structure, and is respectively arranged at the upper part of both sides of each frame 8 along the second direction. Take ten wet membrane components 3 of the water system as an example, ten wet membrane components 3 are divided into five groups, each of which is two and is respectively fixedly connected to the air side of the heat dissipation surface 11 of the corresponding heat exchanger 1, and the wet membrane 32 of the wet membrane component 3 is at a preset second inclination angle α2 with the vertical plane, and the wet membrane 32 is parallel to the heat dissipation surface 11 of the corresponding heat exchanger 1. The third pipe section 23 is plugged and fixed to the upper end of the corresponding wet membrane 32 along the second direction, and the water outlet hole 231 is buried in the corresponding wet membrane 32.

[0084] See also Figure 1 and Fig.10 In some embodiments of the present application, a method for controlling a water system of a multi-split air-cooled air conditioner is provided, wherein the water system is any of the water systems described above, and the multi-split air-cooled air conditioner is any of the multi-split air-cooled air conditioners described above. The multi-split air-cooled air conditioner comprises a heat exchanger 1 as described above, and a fan 9 (such as Figure 1 ). A plurality of fans 9 may be provided, fixedly mounted at the upper opening of the frame 8 of the outdoor unit, and the fans 9 are configured to allow airflow to flow between the heat dissipation surface 11 of the heat exchanger 1 and the corresponding wet membrane assembly 3 to achieve heat exchange.

[0085] Among them, the control method includes: when the ambient temperature T is higher than the preset water system start-up temperature Tset, if the water system is in water-saving mode, then when the feedback speed Sfb of the fan 9 reaches 100%, the condensing pressure Pc reaches the condensing pressure high alarm value Pha, and the water system is in a wet working condition and there is no abnormality, start the water pump 4 to run; and / or, when the ambient temperature T is higher than the preset water system start-up temperature Tset, if the water system is in energy-saving mode, and the water pump 4 is not started, then when the feedback speed Sfb of the fan 9 reaches the preset starting speed Sset, and the water system is in a wet working condition and there is no abnormality, start the water pump 4 to run.

[0086] In summer, the ambient temperature is high and the heat exchanger 1 of the multi-split air-cooled air conditioner has poor heat dissipation. When the ambient temperature T is higher than the preset water system start-up temperature Tset (which can be set to 25°C), the above control method will be executed on the water system. It can be understood that whether the water system is in water-saving mode or energy-saving mode, it is necessary to determine whether the outdoor unit of the multi-split air-cooled air conditioner is turned on and whether the system is available.

[0087] Before the water system is activated, the air flow on the air side of the heat dissipation surface 11 of the heat exchanger 1 can be increased by increasing the speed of the fan 9 to improve the heat exchange efficiency of the heat exchanger 1. If this method can improve the heat exchange effect of the heat exchanger 1, there is no need to start the water pump 4 of the water system to wet the wet film 32, which can minimize the resource consumption of the water system and achieve the purpose of energy saving and consumption reduction.

[0088] See also Fig.10 In some embodiments, when the ambient temperature T is higher than the preset water system start-up temperature Tset, if the current mode Model of the water system is in the water-saving mode, the feedback speed Sfb and condensing pressure value Pc of the fan 9 will be further determined. When the feedback speed Sfb of the fan 9 reaches 100% (i.e., the fan 9 is fully rotated) and the condensing pressure Pc reaches the condensing pressure high alarm value Pha, it indicates that the condensing pressure Pc of the outdoor unit of the multi-connected air-cooled air conditioner has reached the limit state, and the speed of the fan 9 can no longer continue to increase. The water system must be turned on to effectively reduce the condensing pressure Pc of the unit. Of course, the start-up conditions of the water system are also subject to other necessary conditions, such as further determining whether the current system operating condition is a wet operating condition, whether the water level of the water pump 4 and the circulating water tank 6 has abnormal fault alarms, etc., and the water pump 4 start-up action can only be executed after the corresponding conditions are met. It can be understood that when the condensing pressure of the outdoor base can be suppressed, there is no need to execute the water pump 4 start-up action to avoid waste of water resources.

[0089] In combination with the control method provided in the present application, when the ambient temperature is higher than the preset water system start-up temperature, if the water system is in the water-saving mode, the water pump 4 of the water system will be allowed to start only when the feedback speed of the fan 9 of the multi-split air-cooled air conditioner reaches 100% and the condensing pressure reaches the high alarm value. This avoids the waste of resources caused by starting the water system when the multi-split air-cooled air conditioner is running at low load, and has a better water-saving effect.

[0090] See also Fig.10In some embodiments, when the ambient temperature T is higher than the preset water system start-up temperature Tset, if the current water system mode Model does not belong to the water-saving mode, it is determined whether the current water system mode Model belongs to the energy-saving mode. If it belongs to the energy-saving mode, it is determined whether the water pump 4 has been started at this time. If the water pump 4 has not been started, it is determined whether the feedback speed Sfb of the fan 9 has reached the preset start-up speed Sset for the water system to start. If Sfb = Sset, it is determined whether the current system working condition is a wet working condition, whether the water level of the water pump 4 and the circulating water tank 6 has abnormal fault alarms, etc., and the water pump 4 can only be started after the corresponding conditions are met. In this process, if any condition is not met, there is no need to execute the water pump 4 start action.

[0091] In combination with the control method provided by the present application, when the ambient temperature is higher than the preset water system start-up temperature, if the water system is in energy-saving mode and the water pump 4 is not started, the water pump 4 of the water system will be allowed to start only when the feedback speed of the fan 9 of the multi-connected air-cooled air conditioner reaches the preset start-up speed, thereby utilizing the principle of water evaporation and heat absorption to effectively reduce the ambient air temperature on the air side of the heat dissipation surface 11 of the heat exchanger 1, so that the refrigerant in the fin coil and the air can fully exchange heat, effectively reduce the refrigerant temperature, and improve the heat exchange efficiency of the heat exchanger 1. The control method of the water system provided by the present application can be well combined with system requirements, accurately control the start and stop actions of the water system, and achieve better energy-saving effects.

[0092] The control method of the water system provided in the present application has two control modes, namely, water-saving mode and energy-saving mode, and one of the two modes is used to control the operation of the water system. After adopting the technical solution of the present application, the multi-connected air-cooled air conditioner used in the data center can better adapt to the operation in the high temperature environment in summer, improve the heat exchange efficiency of the heat exchanger 1, reduce energy consumption, and reduce the PUE value of the data center to below 2, meeting the requirements of energy conservation, emission reduction and green environmental protection of the data center.

[0093] If the current mode Model is neither the water-saving mode nor the energy-saving mode, it indicates that the operating pressure of the multi-split air-cooling air-conditioning outdoor unit is not high at this time, and there is no need to open the water system to assist the heat exchanger 1 in dissipating heat.

[0094] See also Fig.10 In some embodiments, the method for starting the water pump 4 includes: within the first 3 minutes of the operation of the water pump 4, the water pump 4 is turned on for 5 seconds and off for 15 seconds, and the cycle continues until the operation time t reaches 3 minutes; within the 3rd to 7th minutes of the operation of the water pump 4, the water pump 4 is turned on for 10 seconds and off for 10 seconds, and the cycle continues until the operation time t reaches 7 minutes; within the 7th to 10th minutes of the start-up operation of the water pump 4, the water pump 4 is turned on for 15 seconds and off for 5 seconds, and the cycle continues until the operation time t reaches 10 minutes; after 10 minutes of the operation of the water pump 4, the water pump 4 remains normally on.

[0095] If the water pump 4 is kept running at all times at the moment of starting, the third pipe section 23 of the water supply pipe 2 will continue to spray a large amount of cooling water to the corresponding wet membrane assembly 3 in the initial state, while the wet membrane 32 is relatively dry in the initial state, and has insufficient affinity with cooling water, and cannot immediately absorb all the cooling water, which will cause some cooling water to be lost. However, the control method of the present application adopts a time-sharing control method within the first 10 minutes of the start-up of the water pump 4, and controls the water pump 4 to operate in an intermittent operation mode with different modes, so that the third pipe section 23 can gradually spray cooling water to the corresponding wet membrane 32 and gradually wetting the wet membrane 32, which significantly reduces the unnecessary loss of cooling water on the wet membrane 32, improves the recycling rate of cooling water, and is beneficial to energy saving and consumption reduction.

[0096] In the prior art, cooling water is generally sprayed directly onto the fins of the heat exchanger 1 through a nozzle to assist in heat dissipation. If the water pump 4 is kept in normal operation at the moment of startup, a large amount of cooling water will evaporate and absorb heat on the air side of the heat dissipation surface 11 of the heat exchanger 1, taking away a large amount of heat, causing the condensing pressure of the unit to drop rapidly. The refrigerant in the fin coil quickly vaporizes before entering the fluorine pump, causing cavitation, which can easily lead to interruption of the fluorine pump's liquid supply, and then cause instantaneous loss of cooling capacity.

[0097] The method for starting the operation of the water pump 4 provided in the present application delays the normal opening time of the water pump 4 in three time periods within the first ten minutes of starting the water pump 4, thereby ensuring the water supply for gradually wetting the wet film 32, while avoiding the application of a large amount of cooling water to the air side of the heat dissipation surface 11 of the heat exchanger 1 in the initial stage of starting the water pump 4, preventing the heat exchanger 1 from losing a large amount of heat in a short period of time, avoiding the problem of a rapid drop in condensation pressure caused by the instantaneous start of the water pump 4, and then causing cavitation to form at the inlet of the fluorine pump, thereby solving the problems of flow interruption at the inlet of the fluorine pump, loss of liquid supply, and loss of system refrigeration.

[0098] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A water system for a multi-split air-cooled air conditioner, used to improve the heat exchange efficiency of a heat exchanger (1) of the multi-split air-cooled air conditioner, characterized in that: The water system comprises: A water supply pipeline (2), comprising a first pipeline section (21), a second pipeline section (22), and at least one third pipeline section (23), wherein the second pipeline section (22) extends along a first direction, and the third pipeline section (23) is connected to the second pipeline section (22) and extends along a second direction, wherein the second direction is perpendicular to the first direction; the first pipeline section (21) is connected to the second pipeline section (22) and is configured to transport cooling water to each of the third pipeline sections (23); wherein the third pipeline section (23) is provided with a plurality of water outlet holes (231) arranged at intervals along the second direction; At least one wet membrane assembly (3) is at least partially located at the lower part of the corresponding third pipeline section (23) in the gravity direction and is arranged close to the heat dissipation surface (11) of the corresponding heat exchanger (1) of the multi-connected air-cooling air conditioner; wherein each third pipeline section (23) is provided with at least one wet membrane assembly (3); A water pump (4) is connected to the first pipeline section (21) and is used to pump cooling water into the water supply pipeline (2).

2. The water system of the multi-split air-cooling air conditioner according to claim 1, characterized in that: The water system also includes: At least one water receiving container (5) is disposed at the lower part of the corresponding wet membrane assembly (3) in the direction of gravity and is configured to receive cooling water dripping from the wet membrane assembly (3); A circulating water tank (6) for storing cooling water, wherein a water outlet of the circulating water tank (6) is connected to the water pump (4); The water return pipeline (7) connects all the water receiving containers (5) with the water inlet end of the circulating water tank (6), and is configured to guide the condensed water collected in the water receiving containers (5) back to the circulating water tank (6).

3. The water system of the multi-split air-cooling air conditioner according to claim 2, characterized in that: The volume V of the circulating water tank (6) satisfies the following relationship: V=Q*T1, wherein Q is the working flow of the water pump (4), and T1 is the preset circulation time, which is between 2 and 4 minutes.

4. The water system of the multi-split air-cooling air conditioner according to claim 1, characterized in that: The second direction forms a first preset inclination angle with the horizontal plane, so that the cooling water in the third pipeline section (23) flows from one end to the other end under the action of gravity.

5. The water system of the multi-split air-cooling air conditioner according to claim 1, characterized in that: The water supply pipeline (2) also includes: At least one fourth pipeline section (24), the fourth pipeline section (24) comprising a fourth water inlet end (241) and at least two fourth water outlet ends (242), wherein the fourth water inlet end (241) is connected to the second pipeline section (22), and each of the fourth water outlet ends (242) is connected to one of the third pipeline sections (23).

6. The water system of a multi-split air-cooling air conditioner according to any one of claims 1 to 5, characterized in that: The wet membrane assembly (3) comprises: A fixing bracket (31) detachably connected to a corresponding heat dissipation surface (11) of the heat exchanger (1); At least one wet film (32) is limited to the fixed support (31) and is parallel to and opposite to the heat dissipation surface (11) of the heat exchanger (1); wherein the wet film (32) and the vertical surface form a second preset inclination angle so that at least part of the wet film (32) can move against the fixed support (31) under the action of gravity.

7. The water system of the multi-split air-cooling air conditioner according to claim 6, characterized in that: The number of wet films (32) is N, and when 0<N≤4, the diameter D1 of the first pipeline section (21), the diameter D2 of the second pipeline section (22), and the diameter D3 of the third pipeline section (23) satisfy the following relationship: D1=D2=D3; When 4<N≤10, the diameter D1 of the first pipeline section (21), the diameter D2 of the second pipeline section (22), and the diameter D3 of the third pipeline section (23) satisfy the following relationship: D3<D1≤D2, and D2=2*D3.

8. The water system of a multi-split air-cooling air conditioner according to any one of claims 1 to 5, characterized in that: The diameter of the water outlet holes (231) is between 2 and 4 mm, and the distance between two adjacent water outlet holes (231) is between 35 and 45 mm.

9. A method for controlling a water system of a multi-split air-cooling air conditioner, characterized in that: The water system is the water system according to any one of claims 1 to 8, and the multi-split air-cooled air conditioner is the multi-split air-cooled air conditioner according to any one of claims 1 to 8; the multi-split air-cooled air conditioner comprises the heat exchanger (1) according to any one of claims 1 to 8, and a fan (9), wherein the fan (9) is configured to enable airflow to flow between the heat dissipation surface (11) of the heat exchanger (1) and the corresponding wet film assembly (3) to achieve heat exchange; wherein the control method comprises: When the ambient temperature T is higher than the preset water system start-up temperature Tset, if the water system is in a water-saving mode, the water pump (4) is started to operate when the feedback speed Sfb of the fan (9) reaches 100%, the condensing pressure Pc reaches the condensing pressure high alarm value Pha, and the water system is in a wet working state and has no abnormalities; And / or, when the ambient temperature T is higher than a preset water system start-up temperature Tset, if the water system is in energy-saving mode and the water pump (4) is not started, then when the feedback speed Sfb of the fan (9) reaches a preset start-up speed Sset and the water system is in a wet working state and there is no abnormality, the water pump (4) is started to operate.

10. The method for controlling the water system of a multi-split air-cooling air conditioner according to claim 9, characterized in that: The method for starting the water pump (4) comprises: In the first 3 minutes of the operation of the water pump (4), the water pump (4) is turned on for 5 seconds and off for 15 seconds, and the cycle continues until the operation time reaches 3 minutes; During the 3rd to 7th minutes of the operation of the water pump (4), the water pump (4) is turned on for 10 seconds and off for 10 seconds, and the cycle continues until the operation time reaches 7 minutes; During the 7th to 10th minute after the water pump (4) is started, the water pump (4) is turned on for 15 seconds and off for 5 seconds, and the cycle continues until the running time reaches 10 minutes; After the water pump (4) has been running for 10 minutes, the water pump (4) remains normally open.

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