Indirect evaporative cooling unit

Abstract

The embodiment of the present application provides an indirect evaporative cooling unit, comprising: a heat exchange chamber, a heat exchange core; a condenser, which is arranged at an air outlet of outdoor air flowing through the heat exchange core; a condenser spraying device, a spraying pump and a water supply device, wherein the spraying pump is connected with the condenser spraying device and the water supply device; wherein the condenser spraying device is used for spraying the condenser; the spraying pump is used for controlling the opening and closing of the condenser spraying device and the water flow of spraying; wherein the condenser spraying device comprises a plurality of branches, each branch is composed of a spraying water pipe and a plurality of spraying heads arranged on the spraying water pipe. The indirect evaporative cooling unit provided by the embodiment of the present application sprays through the condenser spraying device, so that the hot air flowing through the heat exchange core is sprayed and evaporatively cooled after reaching the surface of the condenser, the heat dissipation efficiency of the condenser is improved, and the power output rate of the data center is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioning systems, and more particularly to an indirect evaporative cooling unit. BACKGROUND

[0002] With the continuous expansion of the scale of data centers and the continuous improvement of power density, data centers have become typical energy consumers. Data centers pursue high power utilization rate, reduce peak power, improve power density, and increase the proportion of data center IT load power and total power distribution power, in order to improve the IT computing power of the data center.

[0003] The existing indirect evaporative cooling scheme has the following problems in the design of the framework. On the one hand, the air of the heat exchange core and the condenser is shared. Generally, the air first passes through the heat exchange core and then passes through the condenser, resulting in high inlet air temperature of the condenser, thereby causing poor heat dissipation effect. On the other hand, in recent years, extreme weather has been constantly breaking records (generally, the extreme dry-bulb temperature is high, and the wet-bulb temperature does not increase significantly, so the influence on water-cooled and evaporative condensation is small, and the influence on air-cooled condensers is large). The air-cooled condenser of the indirect evaporative cooling unit has high condensation temperature at extremely high temperature, and the compressor has high power consumption. In order to solve the problem of high condenser temperature and low heat dissipation efficiency, the present application provides an indirect evaporative cooling unit, which can accelerate the heat dissipation speed of the condenser and reduce the peak power of the unit, thereby improving the power utilization rate of the data center. SUMMARY

[0004] The embodiment of the present application provides an indirect evaporative cooling unit, which aims to improve the heat dissipation efficiency of the condenser and improve the power utilization rate of the data center.

[0005] In a first aspect, an indirect evaporative cooling unit is provided, which comprises a heat exchange chamber and a heat exchange core for indirect heat exchange between outdoor air and indoor return air, the heat exchange core being arranged in the heat exchange chamber; a condenser arranged at an air outlet of outdoor air flowing through the heat exchange core, for dissipating heat of a working medium flowing through the interior of the condenser; a condenser spraying device, a spraying pump and a water supply device, the spraying pump being connected with the condenser spraying device and the water supply device; wherein the condenser spraying device is used for spraying the condenser to play a role of cooling and / or cleaning; the spraying pump is used for controlling the opening and closing of the condenser spraying device and the flow of spraying water; the water supply device is used for providing spraying water; wherein the condenser spraying device comprises a plurality of branches, each branch being composed of a spraying water pipe and a plurality of spraying heads arranged on the spraying water pipe, the spraying heads facing the condenser for spraying.

[0006] The indirect evaporative cooling unit of the present application can effectively improve the heat dissipation efficiency of the condenser, reduce the peak power of the unit, and thus improve the power output rate of the data center, by providing the condenser spraying device, so that the hot air flowing through the heat exchange core is sprayed and evaporatively cooled after reaching the surface of the condenser.

[0007] In combination with the first aspect, in some implementations of the first aspect, the spraying system further comprises: a cutoff valve arranged on each branch of the condenser spraying device, for controlling the opening and closing of each branch of the condenser spraying device.

[0008] When all the cutoff valves are opened, the condenser spraying device is in the spraying mode to cool the condenser; or when some of the cutoff valves are opened, the condenser spraying device is in the cleaning mode to clean the condenser.

[0009] When the indirect evaporative cooling unit is in a hot and humid state, for example, in high-temperature working conditions in summer, or when the temperature of the condenser surface is detected to be higher than the set temperature, the condenser has poor heat dissipation effect, at this time, the condenser spraying mode is started, all branches are opened by controlling the cutoff valve, so that the water flow is uniformly sprayed on the surface of the condenser, the condenser spraying cooling is realized, and the heat dissipation efficiency is improved; when the condenser has been used for a long time and dust and dirt are deposited on the surface, the cleaning mode is started at this time, only part of the branches are opened by controlling the cutoff valve, the water flow of the spraying head is increased, and the condenser is effectively cleaned.

[0010] In combination with the first aspect, in some implementations of the first aspect, the spraying system further comprises: a heat exchange core spraying device connected to the spraying pump, for spraying the heat exchange core to evaporatively cool the air flowing through the heat exchange core.

[0011] In combination with the first aspect, in some implementations of the first aspect, the water supply device comprises: a water storage tank and a water replenishing pump, the water inlet of the water storage tank is connected to the water replenishing pump; wherein the water replenishing pump is connected to a tap water source for replenishing water in the water storage tank; the water storage tank is used to provide water required by the condenser spraying device for spraying.

[0012] In combination with the first aspect, in some implementations of the first aspect, the water supply device comprises: a spraying water tank and a water tank water pumping pump, the water storage tank is connected to the spraying water tank, and the water tank water pumping pump is connected between the water storage tank and the spraying water tank; wherein the spraying water tank is arranged below the condenser spraying device or the heat exchange core spraying device, and is used to recover the sprayed water; the water tank water pumping pump pumps the sprayed water to the water storage tank.

[0013] The water supply device of the application can store tap water, rainwater or sewage on one hand, and can be used in emergency when water resources are scarce, which is beneficial to solve the problems of large water consumption of indirect evaporative cooling unit and poor security of single-point water supply; on the other hand, low-temperature water can be accumulated at night when the temperature is low, and the cold storage function is realized. The spray water tank receives the water sprayed by the condenser and the heat exchange core, and then injects the water into the water storage tank to form water recycling, which is beneficial to save water resources. When the water in the spray water tank is less, the water tank pump collects and extracts the remaining water in the spray water tank to the water storage tank, and then adjusts the flow of the condenser spray pump and the heat exchange core spray pump for single-cycle spray atomization, which can play an emergency role in the case of water scarcity and improve the safety and availability of the data center.

[0014] In combination with the first aspect, in some implementations of the first aspect, the water supply device further comprises: a filter for filtering water entering the water storage tank; wherein at least one of the filters is connected between the water replenishment pump and the water storage tank, and at least one of the filters is connected between the water storage tank and the spray water tank.

[0015] In combination with the first aspect, in some implementations of the first aspect, the water storage tank comprises: a dosing device arranged on the outer wall of the water storage tank, for cleaning the condenser or the heat exchange core.

[0016] The water supply device of the application can be connected to rainwater, sewage or tap water. When the water supply device comprises a water storage tank, the water storage tank can be periodically dosed to decompose the calcium and dirt deposited on the surface of the water storage tank due to long-term use, and the condenser and the heat exchange core can be cleaned by spray water, which saves the trouble of manual disassembly and cleaning.

[0017] In combination with the first aspect, in some implementations of the first aspect, it comprises: a solar photovoltaic light and heat system having a photovoltaic unit, a radiation refrigeration unit and a power supply / battery unit; wherein the photovoltaic unit is connected with the power supply / battery unit for photovoltaic power generation; the radiation refrigeration unit is connected with the water storage tank for refrigerating water in the water storage tank; the power supply / battery unit is connected with the spray pump and the radiation refrigeration unit respectively for providing power for spray work and refrigeration work; wherein the power supply / battery unit comprises a plurality of storage batteries for storing residual power.

[0018] In combination with the first aspect, in some implementations of the first aspect, it comprises: an air exhaust guide cover arranged at the top of the indirect evaporative cooling unit for guiding hot air to be discharged to the outside through the air exhaust guide cover outlet.

[0019] The indirect evaporative cooling unit of the present application generates electricity by itself through the solar photovoltaic photo-thermal system and stores the remaining electricity, provides the electricity required by the spraying system, uses radiation refrigeration to store cold energy for the spraying system at night, further improves the heat dissipation efficiency of the condenser, and improves the power output rate of the entire data center.

[0020] In combination with the first aspect, in some implementations of the first aspect, the indirect evaporative cooling unit comprises: a compression refrigeration system comprising an evaporator, a first heat sink, a compressor, and an expansion valve; the compression refrigeration system is connected with the power supply / battery unit and used to refrigerate the water in the water storage tank; the evaporator is arranged in the water storage tank and connected with the compressor and the first heat sink in sequence; and the expansion valve is connected between the first heat sink and the evaporator.

[0021] The indirect evaporative cooling unit of the present application generates electricity by itself through the solar photovoltaic photo-thermal system and stores the remaining electricity, provides the electricity required by the spraying system, uses radiation refrigeration to store cold energy for the spraying system at night, further improves the heat dissipation efficiency of the condenser, and improves the power output rate of the entire data center.

[0022] In combination with the first aspect, in some implementations of the first aspect, the indirect evaporative cooling unit comprises: a heat dissipation system comprising a second heat sink and a circulating pump, and the heat dissipation system is used to dissipate heat for the solar photovoltaic photo-thermal system.

[0023] The second heat sink is connected with the circulating pump and the photovoltaic unit, and the circulating pump is connected with the power supply / battery unit.

[0024] The indirect evaporative cooling unit of the present application generates electricity by itself through the solar photovoltaic photo-thermal system and stores the remaining electricity, provides the electricity required by the spraying system, uses radiation refrigeration to store cold energy for the spraying system at night, further improves the heat dissipation efficiency of the condenser, and improves the power output rate of the entire data center.

[0025] In combination with the first aspect, in some implementations of the first aspect, the photovoltaic unit comprises: a tempered glass cover layer, a first buffer layer, a photovoltaic cell layer, a second buffer layer, and a substrate layer; the first buffer layer is connected between the tempered glass cover layer and the photovoltaic cell layer, and the second buffer layer is connected between the photovoltaic cell layer and the substrate layer.

[0026] In combination with the first aspect, in some implementations of the first aspect, the radiation refrigeration unit comprises: a radiation refrigeration film, a light reflection surface, and a circulating pipeline; the radiation refrigeration film and the light reflection surface are integrally layered from top to bottom; and the circulating pipeline is connected with the water storage tank and used to transfer cold energy to the water storage tank.

[0027] With reference to the first aspect, in some implementations of the first aspect, the indirect evaporative cooling unit comprises: the first heat sink or the second heat sink is arranged at the outlet of the exhaust air deflector, and the first heat sink or the second heat sink is cooled by air flow at the outlet.

[0028] With reference to the first aspect, in some implementations of the first aspect, the indirect evaporative cooling unit comprises: a fan connected to the first heat sink or the second heat sink, for cooling the first heat sink or the second heat sink.

[0029] With reference to the first aspect, in some implementations of the first aspect, the water supply device comprises: a regulating valve, an inlet of the regulating valve being connected to a water supply pipeline, and an outlet of the regulating valve being connected to the spray pump.

[0030] With reference to the first aspect, in some implementations of the first aspect, the condenser spray device is arranged below the condenser and sprays upward to the condenser.

[0031] With reference to the first aspect, in some implementations of the first aspect, the condenser spray device is arranged above the condenser and sprays downward to the condenser.

[0032] The second aspect provides an indirect evaporative cooling system applied to a data center or an industrial plant, comprising one or more indirect evaporative cooling units as described in the first aspect and any possible implementation thereof. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a schematic diagram of an indirect evaporative cooling unit provided by an embodiment of the present application.

[0034] Figure 2 is a schematic diagram of a condenser spray device provided by an embodiment of the present application.

[0035] Figure 3 is a schematic diagram of an indirect evaporative cooling unit provided by an embodiment of the present application.

[0036] Figure 4 is a schematic diagram of a water supply device provided by an embodiment of the present application.

[0037] Figure 5 is a schematic diagram of a water supply device provided by an embodiment of the present application.

[0038] Figure 6 is a schematic diagram of an indirect evaporative cooling unit provided by an embodiment of the present application.

[0039] Figure 7 is a schematic diagram of an indirect evaporative cooling unit provided by an embodiment of the present application.

[0040] Figure 8 is a schematic diagram of an indirect evaporative cooling unit provided by an embodiment of the present application.

[0041] Figure 9 is a schematic diagram of a photovoltaic unit provided by an embodiment of the present application.

[0042] Figure 10 is a schematic diagram of a radiation refrigeration unit provided by an embodiment of the present application.

[0043] Figure 11 is a schematic diagram of an indirect evaporative cooling unit provided by an embodiment of the present application.

[0044] Reference signs:

[0045] 100-indirect evaporative cooling unit; 101-heat exchange chamber; 102-heat exchange core; 103-condenser; 111-condenser spraying device; 112-spraying pump; 120-water supply device; 1111-spraying water pipe; 1112-spraying head; 115-separation valve; 116-heat exchange core spraying device; 121-water storage tank; 122-water supplement pump; 123-spraying water tank; 124-water tank water pumping pump; 125-filter; 1211-dosing device; 126-regulating valve; 200-solar photovoltaic photo-thermal system; 210-photovoltaic unit; 220-radiation refrigeration unit; 230-power supply / battery unit; 231-battery; 130-exhaust air flow guide cover; 211-tempered glass cover layer; 212-first buffer layer; 213-photovoltaic cell layer; 214-second buffer layer; 215-substrate layer; 221-radiation refrigeration film; 222-light reflecting surface; 223-circulation pipeline; 140-compression refrigeration system; 141-evaporator; 142-first radiator; 143-compressor; 144-expansion valve; 150-radiating system; 151-second radiator; 152-circulation pump; 153-fan. DETAILED DESCRIPTION

[0046] With the continuous expansion of the scale of data centers and the continuous increase of power density, data centers have become typical energy consumers. Taking a typical data center with an IT rated capacity of 1 MW and a design PUE of 1.5 as an example, from construction to operation for 10 years, the electricity cost accounts for more than 60% of the total investment, among which the energy consumption of the refrigeration system accounts for about 30% of the total energy consumption. Therefore, the refrigeration solution of the data center determines the upper limit of the energy consumption to a large extent, and the energy saving of the refrigeration system has become the primary demand of the construction of the data center.

[0047] Indirect evaporative cooling: the process of transferring the cold energy of the wet air from direct evaporative cooling to the air to be treated through a non-direct contact heat exchanger to achieve air cooling with constant humidity, to achieve the effect of fully utilizing natural cold source and reducing mechanical refrigeration energy consumption. Indirect evaporative cooling system has gradually become the mainstream solution for data centers.

[0048] PUE: the abbreviation of Power Usage Effectiveness, is an index for evaluating the energy efficiency of a data center, is the ratio of all energy consumed by the data center to the energy consumed by the IT load.

[0049] Peak power: the maximum power consumption of the equipment throughout the year.

[0050] Outage rate: GUE (Grid Usage Effectiveness), is an index for comprehensively measuring the efficiency of a data center, is the ratio of the IT load power of the data center to the total power distribution power of the data center, commonly expressed in percentage

[0051] Air-to-air heat exchanger core: a non-direct contact heat exchanger, the fluids on both sides exchange heat

[0052] Photovoltaic power generation: photovoltaic power generation is a technology that converts light energy into electric energy directly through the photovoltaic effect of the semiconductor interface. It mainly consists of solar panels (components), controllers and inverters, and the main components are composed of electronic components. Solar cells can be connected in series and encapsulated to form a large area of solar cell components, and then combined with power controllers and other components to form a photovoltaic power generation device.

[0053] Radiative cooling: the sky radiative cooling technology refers to the process of emitting infrared radiation to the universe through the "atmospheric window" band (mainly in 8-13 μm) to achieve the cooling of the earth's surface object

[0054] Solar photovoltaic / thermal (PV / T) technology: solar photovoltaic / thermal (PV / T) technology combines photovoltaic and photothermal (sky radiative cooling) together, which can achieve high solar energy utilization.

[0055] The technical solutions in the embodiments of the present application will be described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor shall fall within the scope of protection of the present application.

[0056] Figure 1 A schematic plan view of an indirect evaporative cooling unit 100 according to an embodiment of the present application is shown.

[0057] The indirect evaporative cooling unit of the embodiment of the present application comprises a heat exchange chamber, a heat exchange core, a condenser, a condenser spraying device, a spraying pump and a water supply device, which are used for spraying and cooling the condenser to improve the heat dissipation efficiency of the condenser, thereby improving the power output rate of the data center.

[0058] Specifically, as shown in the figure, Figure 1 The indirect evaporative cooling unit 100 comprises a heat exchange chamber 101, an outdoor air inlet on the outer wall of the heat exchange chamber 101, a heat exchange core 102 arranged in the heat exchange chamber 101, a condenser 103 arranged at the air outlet of the heat exchange core 102, a spraying system comprising a condenser spraying device 111, a spraying pump 112 and a water supply device 120, the spraying pump 112 being connected with the condenser spraying device 111, the spraying pump 112 being connected with the water supply device 120 and being used for controlling the opening and closing of the condenser spraying device and the water flow, wherein the condenser spraying device 111 comprises a plurality of branches, each branch being composed of a spraying water pipe 1111 and a plurality of spraying heads 1112 arranged on the spraying water pipe 1111, and the spraying heads 1112 face the condenser 103 for spraying.

[0059] It should be understood that the working principle of the indirect evaporative cooling unit 100 is that the outdoor air enters the heat exchange chamber 101 from the outdoor air inlet, flows through the heat exchange core 102, the indoor return air enters the heat exchange chamber 101 from the return air inlet, flows through the heat exchange core 102, and is indirectly heat exchanged with the outdoor air, the cooled indoor return air is further cooled by the mechanical refrigeration assembly, the cold air is sent back to the indoor, and the hot air flows through the condenser 103 after coming out of the heat exchange core 102, carries away the heat released by the circulating working medium on the surface of the condenser 103, and is discharged from the heat exchange chamber 101. In the summer high-temperature working condition or other hot and humid time period, or when it is detected that the surface temperature of the condenser 103 is higher than the preset temperature, the surface of the condenser 103 is overheated due to the high temperature of the inlet air, the heat dissipation effect is poor, the condenser spraying device 111 is opened in the spraying mode, the surface temperature of the condenser 103 is reduced, and the heat dissipation efficiency is improved. Alternatively, the condenser spraying device 111 can be manually opened and closed by controlling the spraying pump 112 according to the needs, or the spraying pump 112 can be automatically opened and closed under the control of the control system according to the meteorological parameters and the characteristic curve of the unit itself, and the embodiment of the present application is not limited thereto.

[0060] Therefore, the indirect evaporative cooling unit of the embodiment of the present application can effectively improve the heat dissipation efficiency of the condenser, reduce the peak power of the unit, and thereby improve the power output rate of the data center, by arranging the condenser spraying device to make the hot air after the heat exchange core reach the surface of the condenser after being cooled by spraying.

[0061] Optionally, the heat exchange core 102 can be tilted, and the heat exchange core 102 can have a certain angle with the horizontal direction. The condenser 103 is located at the air outlet of the heat exchange core 102. When the heat exchange core 102 is tilted, the condenser 103 can be located on the side of the heat exchange core 102 or in other positions. This application does not make specific limitations.

[0062] Optionally, the indirect evaporative cooling unit 100 further includes a fan assembly for guiding the flow of outdoor air and server room air. The fan assembly guides the outdoor air through the heat exchange core 102, where it exchanges heat with the indoor return air entering the heat exchange core 102. The cooled air after heat exchange is then returned to the data center, while the hot air and the heat released by the condenser are exhausted to the outside from the top of the heat exchange chamber. The fan assembly includes at least one fan unit for guiding the outdoor air to exchange heat with the indoor return air, exhausting the hot air to the outside, and returning the cooled air to the room. The fans can be of different types and power, including but not limited to centrifugal fans, axial fans, and mixed-flow fans, as long as they meet the air supply requirements; this application does not impose specific limitations.

[0063] Alternatively, the condenser can be finned tube type, microchannel type, etc., and this application does not make specific limitations.

[0064] It should be understood that, in this embodiment of the application, the condenser spray device 111 sprays water towards the condenser 103 and can be located below the condenser 103, such as... Figure 1 As shown, this achieves downward spray cooling of the condenser; it can also be positioned above the condenser 103, as shown. Figure 11 As shown, the purpose of spraying cooling onto the condenser is to meet the requirements for condenser spray cooling and cleaning; the location is not specifically limited.

[0065] Optionally, in this embodiment of the application, the indirect evaporative cooling unit 100 further includes:

[0066] Isolation valve 115 is installed on condenser spray device 111.

[0067] Specifically, such as Figure 2 As shown, isolation valves 115 are installed on each branch of the condenser spray device 111 to control the on / off state of each branch of the condenser spray device 111. It should be understood that the isolation valves 115 can be opened and closed manually, or they can be automatically opened and closed by a controller, but the embodiments of this application are not limited thereto.

[0068] It should be understood that when the indirect evaporative cooling unit is in a wet and hot state, for example, in a summer high-temperature working condition or a time period from 12 o'clock to 4 o'clock in the afternoon, or when it is detected that the temperature of the surface of the condenser is higher than the set temperature, the condenser has low heat dissipation efficiency, and the condenser spraying device 111 needs to cool the condenser 103, at this time, the condenser spraying mode is opened, all branches are opened by controlling the cutoff valve 115, so that the water flow is uniformly sprayed on the surface of the condenser 103, the condenser 103 is sprayed and cooled, and the heat dissipation efficiency is improved; when the condenser 103 is used for a long time, dirt is deposited on the surface, the condenser spraying device 111 needs to clean the condenser 103, at this time, the cleaning mode is opened, only part of the spraying pipe 1111 is opened by controlling the cutoff valve 115, the water flow of the spraying head 1112 can be increased, and the condenser can be effectively cleaned.

[0069] Optionally, as shown in Figure 3 The indirect evaporative cooling unit 100 further includes a heat exchange core spraying device 116 connected with the spraying pump 112, for spraying the heat exchange core 102; when the heat exchange core spraying device 116 starts to spray, the outdoor air flows through the heat exchange core 102, and can be in direct contact with the indoor return air after being evaporatively cooled and isenthalpicly cooled on the surface of the heat exchange core 102. Optionally, the cutoff valve 115 can be arranged on the heat exchange core spraying device 116, all branches are opened by controlling the cutoff valve 115, so that the water flow is uniformly sprayed on the surface of the heat exchange core 102, the indoor air is indirectly evaporatively cooled, and branches are only opened by controlling the cutoff valve 115, so that the water flow of the spraying head is increased, and the heat exchange core 102 is cleaned. The heat exchange core spraying device 116 can meet the requirements of spraying and cooling and cleaning of the heat exchange core, and the structure and position thereof are not specifically limited.

[0070] Specifically, as shown in Figure 4 The water supply device 120 includes:

[0071] The water storage tank 121, the water supplement pump 122, the spraying water tank 123, and the water tank water pump 124 are connected; the water outlet of the water storage tank 121 is connected with the spraying pump 112, the first branch of the water inlet of the water storage tank 121 is connected with the water supplement pump 122, the second branch is connected with the spraying water tank 123, and the water tank water pump 124 is connected between the water storage tank 121 and the spraying water tank 123.

[0072] The water supplement pump 122 is connected with a water source, for supplementing water in the water storage tank 121; the water storage tank 121 is used for providing water required by the condenser spraying device 111 and the heat exchange core spraying device 116; the spraying water tank 123 is arranged below the heat exchange core 102, for recycling the spraying water; and the water tank water pump 124 extracts the spraying water and transmits the spraying water to the water storage tank 121. The spraying water tank 123 is used for recycling the water after spraying the condenser and the heat exchange core, facilitating water circulation, and saving resources.

[0073] It should be understood that the water storage tank 121 of the embodiment of the present application can store tap water, rainwater or sewage, and can be used in emergency when water resources are scarce, so as to solve the problems of large water consumption of the indirect evaporative cooling unit and poor single-point water supply security. On the other hand, the water storage tank 121 can store cold energy when the temperature is low at night, and the cold storage function can be realized by storing low-temperature water. The spray water tank 123 is used to recycle the water sprayed by the condenser 103 or the heat exchange core 102, and the recycled water is injected into the water storage tank 121 to form a water circulation, so as to save water resources. When the water in the spray water tank 123 is less, the water tank water pump 124 collects and extracts the remaining water in the spray water tank 123 to the water storage tank 121, and then the flow of the spray pump 112 is adjusted for single-cycle spray atomization, so as to play an emergency role in the case of water scarcity and improve the safety and availability of the data center.

[0074] Optionally, as shown in Figure 4 the water supply device 120 further comprises a filter 125 for filtering the water entering the water storage tank 121; at least one filter 125 is connected between the water replenishment pump 122 and the water storage tank 121, and at least one filter 125 is connected between the water storage tank 121 and the spray water tank 123. When the water storage tank 121 is connected to a rainwater or sewage source, the filter 125 filters the water entering the water storage tank 121, and when the spray water tank 123 is polluted due to long-term use, the filter 125 filters and processes the water in the spray water tank 123 and then injects it into the water storage tank 121. Optionally, the filter is a Y-type filter, which can filter rust, sand, and solid particles in sewage, reduce impurities in the spray water, protect the fittings on the equipment pipeline from damage and blockage, and protect the normal operation of the equipment. The filter can also be a T-type pipeline filter, a basket filter, etc., without specific limitation.

[0075] Optionally, as shown in Figure 4 the water storage tank 121 comprises a dosing device 1211, which can periodically add cleaning agents to decompose the dirt and calcification deposited on the surface of the water storage tank, the condenser and the heat exchange core due to long-term use, and to realize automatic cleaning when the condenser and the heat exchange core are sprayed. The heat exchange core can also be cleaned by the spray water tank, reducing the trouble and cost of periodic manual cleaning.

[0076] Optionally, as shown in Figure 5 the water supply device 120 can comprise an adjusting valve 126, the inlet of the adjusting valve 126 is directly connected with the water supply pipeline, and the outlet of the adjusting valve 126 is connected with the spray pump 112, without specific limitation.

[0077] Therefore, the indirect evaporative cooling unit has the condenser sprayed and cooled by the condenser spraying device, improves the heat dissipation efficiency of the condenser in the indirect evaporative cooling process, and the partition valve of the spraying system enables the indirect evaporative cooling unit to start another working mode, realizes automatic cleaning of the condenser, and greatly saves the trouble of manual cleaning. Meanwhile, the water supply device provides spraying water for the condenser spraying and the heat exchange core spraying, can be connected with rain sewage source or directly connected with tap water source, realizes water recycling, can play an emergency role in the case of water resource shortage, and improves the safety and availability of the data center.

[0078] Optionally, in another embodiment of the present application, the indirect evaporative cooling unit 100 comprises:

[0079] The solar photovoltaic photo-thermal system 200 can provide power and cold energy for the indirect evaporative cooling unit 100.

[0080] Specifically, as shown in the figure, Figure 6 The solar photovoltaic photo-thermal system 200 comprises a photovoltaic unit 210, a radiation refrigeration unit 220, and a power supply / battery unit 230; the photovoltaic unit 210 is connected with the power supply / battery unit 230 through wires, the power supply / battery unit 230 is connected with the spraying pump 112 and the radiation refrigeration unit 220 respectively, and the radiation refrigeration unit 220 is connected with the water storage tank 121; the power supply / battery unit 230 comprises a plurality of storage batteries 231 connected in sequence through wires.

[0081] Specifically, as shown in the figure, Figure 6 The indirect evaporative cooling unit 100 further comprises an air exhaust guide cover 130 arranged at the top of the indirect evaporative cooling system, which is used to guide the hot air to be discharged from the heat exchange chamber 101 and then discharged to the outside through the outlet of the air exhaust guide cover 130, so as to avoid mutual interference between the top heat exchange chamber exhaust and the solar photovoltaic photo-thermal system.

[0082] Specifically, as shown in the figure, Figure 9 The photovoltaic unit 210 comprises a tempered glass cover layer 211, a first buffer layer 212, a photovoltaic cell layer 213, a second buffer layer 214, and a substrate layer 215; the first buffer layer 212 is connected between the tempered glass cover layer 211 and the photovoltaic cell layer 213, and the second buffer layer 214 is connected between the photovoltaic cell layer 213 and the substrate layer 215.

[0083] Specifically, as shown in the figure, Figure 10As shown, the radiation refrigeration unit 220 comprises a radiation refrigeration film 221, a light reflection surface 222, and a circulation pipeline 223; wherein the radiation refrigeration film 221 and the light reflection surface 222 are integrally layered from top to bottom, the radiation refrigeration film 221 radiates heat energy in the form of light waves to the space, and the circulation pipeline 223 is connected to the water storage tank 121 for transferring cold energy to the water storage tank 121, so as to achieve the purpose of refrigeration of the water storage tank.

[0084] It should be understood that the working principle of the solar photovoltaic photo-thermal system 200 is that the converted electric energy of the photovoltaic unit 210 is provided to the spraying pump 112 during the day, so that the spraying system is in the spraying or cleaning mode, and the remaining electric energy is provided to the power supply / battery unit 230 for storing the remaining electric energy for use at night; the power supply / battery unit 230 provides electric energy for the spraying pump 112 and the radiation refrigeration unit 220 at night, and the radiation refrigeration unit 220 stores cold energy for the water storage tank 121. The solar photovoltaic photo-thermal system can generate electricity by itself on one hand, avoiding the difficulty of grid connection of photovoltaic power generation, so that the photovoltaic power generation can be self-generated and self-used without being connected to the grid, and on the other hand, the cold energy can be stored for the water storage tank at night, so that the heat dissipation speed of the condenser spraying device is faster when spraying, and the power output rate is higher.

[0085] Therefore, the indirect evaporative cooling unit of the embodiment of the present application generates electricity by itself through the solar photovoltaic photo-thermal system, provides the required electricity for the spraying system, stores cold energy for the spraying system by radiation refrigeration at night, further improves the heat dissipation efficiency of the condenser, and improves the power output rate of the entire data center.

[0086] Optionally, the photovoltaic unit 210 and the radiation refrigeration unit 220 are connected at the back and integrally layered from top to bottom, and are connected with rotatable supports on both sides, the photovoltaic unit 210 is turned to the direction of sunlight irradiation through the rotatable supports during the day, and the radiation refrigeration unit 220 is turned to the direction of the sky through the rotatable supports at night. The rotatable supports can be manually rotated or automatically rotated by a control system, which is not specifically limited.

[0087] Optionally, the photovoltaic unit 210 can only be used for photovoltaic power generation to provide power for the indirect evaporative cooling unit; the photovoltaic unit 210 can also adopt a photovoltaic / electric technology to not only provide power for the indirect evaporative cooling unit, but also use the cooling medium to cool the photovoltaic cell layer, thereby improving the power generation efficiency of the entire solar photovoltaic photothermal system. When the photovoltaic unit adopts the photovoltaic / electric technology, the photovoltaic unit is equivalent to a PVT collector, which can be divided into air-cooled, water-cooled, and round heat pipe types according to the cooling medium. The embodiment of the present application takes the air-cooled type as an example, and at least includes a tempered glass layer, a first EVA glue buffer layer, a photovoltaic cell layer, a second EVA glue buffer layer, and a hollow aluminum profile base layer. The tempered glass layer is connected with the first EVA glue buffer layer between the tempered glass layer and the photovoltaic cell layer, and the photovoltaic cell layer is connected with the second EVA glue buffer layer between the photovoltaic cell layer and the hollow aluminum profile base layer. The hollow aluminum profile base layer includes a wind collecting pipe and a ventilation opening arranged at both ends, and uses gas flow to cool the photovoltaic cell layer. The present application is not limited thereto.

[0088] Optionally, the radiation refrigeration film 221 is an inorganic film such as silicon monoxide, silicon dioxide, silicon oxynitride, and various coatings, or a polymer such as PMMA, PVC, PPO resin, and other composite polymer materials, and is not limited in particular. The radiation refrigeration unit can use circulating water, circulating refrigerant, circulating gas, or metal heat conduction to collect and output the cold energy generated by radiation to the water storage tank for refrigeration, and is not limited in particular.

[0089] Optionally, the storage battery 231 can be one of a lead-acid storage battery, a lithium ion battery, a nickel-cadmium storage battery, a zinc-air battery, a super storage battery, and the like, and is not limited in particular.

[0090] Therefore, the indirect evaporative cooling unit of the embodiment of the present application realizes dual functions of power generation and refrigeration through photovoltaic photothermal technology and radiation refrigeration technology, operates all day, can not only make the power self-generated and self-used, but also provide cold energy for the water required by the spraying device, and further improves the spraying cooling effect and the power output rate of the data center.

[0091] Optionally, in the embodiment of the present application, the indirect evaporative cooling unit 100 includes:

[0092] The compression refrigeration system 140 is used for refrigerating the water storage tank.

[0093] Specifically, as Figure 7As shown, the compression refrigeration system 140 includes an evaporator 141 placed in the water storage tank 121 for water storage tank refrigeration; a compressor 143 connected with the first radiator 142, which compresses the cooling medium into the first radiator 142 through a wire, so that the cooling medium is liquefied in the first radiator 142 to exchange heat and release heat; and an expansion valve 144 connected with the first radiator 142 and the evaporator 141, which plays a throttling role and controls the flow of the cooling medium. The compression refrigeration system 140 is connected with the power supply / battery unit 230 of the solar photovoltaic photo-thermal system 200, and the electricity required for operation is provided by the power supply / battery unit 230 of the solar photovoltaic photo-thermal system 200.

[0094] It should be understood that the working principle of the compression refrigeration system 140 is that the compressor 143 is driven by the electricity provided by the power supply / battery unit 230 of the solar photovoltaic photo-thermal system 200 to compress the cooling medium into the first radiator 142, the high-pressure gaseous cooling medium is liquefied in the first radiator 142 to release heat, the heat is discharged to the outside, the high-pressure cooling medium is depressurized by the throttling action of the expansion valve 144, the low-pressure cooling medium is gasified in the evaporator 141 to exchange heat and absorb the heat in the water storage tank 121, and then the cooling medium is pumped out by the compressor 143 again, pumped into the first radiator 142, so that the cooling medium flows in a closed cycle, continuously discharges the heat in the water storage tank 121 to the outside, so as to achieve the purpose of water storage tank refrigeration.

[0095] It should be understood that the first radiator 142 can be placed at the outlet of the air outlet flow cover 130 to utilize the air flow at the outlet to dissipate heat, and the first radiator 142 can be additionally connected with a fan 153 to reduce the heat, which is not limited in the embodiment of the application.

[0096] Therefore, the indirect evaporative cooling unit of the embodiment of the application generates cold energy by the compression refrigeration system, further improves the spray cooling effect and the power output rate of the data center. At the same time, the compression refrigeration system operates by using the self-generated residual electricity of the solar photovoltaic photo-thermal system, does not affect the operation of the original indirect evaporative cooling system, fully utilizes the electricity, and saves resources.

[0097] Optionally, in the embodiment of the application, the indirect evaporative cooling unit 100 includes:

[0098] The heat dissipation system 150 is used for heat dissipation of the solar photovoltaic photo-thermal system 200 and improves the power generation efficiency of the solar photovoltaic photo-thermal system 200.

[0099] Specifically, as shown in the figure, Figure 8 The heat dissipation system 150 includes a second radiator 151 and a circulating pump 152, which are connected with the power supply / battery unit 230 of the solar photovoltaic photo-thermal system 200, and are used for circulating and taking away the heat in the solar photovoltaic photo-thermal system 200.

[0100] It should be understood that the working principle of the heat dissipation system 150 is that the circulating pump 152 is opened and works by electricity provided by the solar photovoltaic photo-thermal system 200, the excess heat on the photovoltaic power generation layer 213 is taken away in time by the circulating working medium, the working temperature of the solar photovoltaic photo-thermal system 200 is controlled, the electric energy can be provided more efficiently, and the comprehensive utilization efficiency of solar energy is greatly improved. The working temperature inside the second heat sink 151 is generally much lower than that of the solar photovoltaic photo-thermal system 200, and in the heat exchange process, the solar photovoltaic photo-thermal system 200 can obtain good heat dissipation effect, thereby improving the power generation efficiency. The heat dissipation system 150 is connected in parallel with the water storage tank 121, when the condenser spraying device 111 or the heat exchange core spraying device 116 works, the heat dissipation system 150 can simultaneously dissipate heat for the solar photovoltaic photo-thermal system 200, which can guarantee the power generation efficiency and will not consume the cold energy stored in the water storage tank.

[0101] It should be understood that the second heat sink 151 can be arranged at the outlet of the air exhaust flow guide cover 130 to dissipate heat by the air flow at the outlet, and the second heat sink 151 can be additionally connected with the fan 153 to reduce the heat, which is not limited in the embodiments of the present application.

[0102] Therefore, the indirect evaporative cooling unit in the embodiments of the present application takes away the excess heat on the photovoltaic power generation layer in time by the circulating working medium of the heat dissipation system, and improves the power generation efficiency of the solar photovoltaic photo-thermal system.

[0103] In the embodiments of the present application, an indirect evaporative cooling system is provided, which comprises one or more indirect evaporative cooling units, and is applied to a data center or an industrial plant, which is not limited in the embodiments of the present application.

[0104] In the embodiments of the present application, "at least one" means one or more, and "multiple" means two or more. The "and / or" describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which means that A exists alone, A and B exist together, and B exists alone. Wherein A and B can be singular or plural. The character " / " generally represents an "or" relationship between the front and rear associated objects. "At least one of the following" and the like means any combination of these items, including any combination of single or multiple items. For example, at least one of a, b and c can mean a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, and c can be single or multiple.

[0105] It should be understood that in various embodiments of the present application, the size of the sequence number of the above processes does not mean the order of execution, the execution order of the processes should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0106] The above description is only specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An indirect evaporative cooling unit (100) characterized in that, The heat exchange chamber (101) and the heat exchange core (102) are used for indirect heat exchange between outdoor air and indoor return air, and the heat exchange core (102) is arranged in the heat exchange chamber (101); The condenser (103) is arranged at the air outlet of the outdoor air flowing through the heat exchange core (102), and is used for heat dissipation of the working medium flowing through the inside of the condenser (103); The condenser spraying device (111), the spraying pump (112) and the water supply device (120) are connected with the condenser spraying device (111) and the water supply device (120); wherein the condenser spraying device (111) is used for spraying the condenser (103); the spraying pump (112) is used for controlling the opening and closing of the condenser spraying device (111) and the water flow of spraying; the water supply device (120) is used for providing spraying water; Wherein, the condenser spraying device (111) includes multiple branches, each branch is composed of a spraying water pipe (1111) and multiple spraying heads (1112) arranged on the spraying water pipe (1111), and the spraying heads (1112) face the condenser (103) for spraying; The solar photovoltaic light heat system (200) has a photovoltaic unit (210), a radiation refrigeration unit (220) and a power supply / battery unit (230); Wherein, the photovoltaic unit (210) is connected with the power supply / battery unit (230), and is used for photovoltaic power generation; The radiation refrigeration unit (220) is connected with the water storage tank (121), and is used for refrigerating the water in the water storage tank (121), and the water storage tank (121) is used for providing the spraying water required by the condenser spraying device (111); The power supply / battery unit (230) is connected with the spraying pump (112) and the radiation refrigeration unit (220) respectively, and is used for providing power for spraying work and refrigeration work; wherein the power supply / battery unit (230) includes multiple storage batteries (231), which are used for storing residual power; The exhaust air flow guide cover (130) is arranged at the top of the indirect evaporative cooling unit (100), and is used for guiding hot air to be discharged to the outside through the outlet of the exhaust air flow guide cover (130); The compression refrigeration system (140) includes an evaporator (141), a first heat dissipator (142), a compressor (143) and an expansion valve (144), and the compression refrigeration system (140) is connected with the power supply / battery unit (230), and is used for refrigerating the water in the water storage tank (121); Wherein, the evaporator (141) is arranged in the water storage tank (121), and is connected with the compressor (143) and the first heat dissipator (142) in sequence; the expansion valve (144) is connected between the first heat dissipator (142) and the evaporator (141); The first heat dissipator (142) is placed at the outlet of the exhaust air flow guide cover (130), and utilizes the air flow at the outlet to dissipate heat. The condenser spraying device (111) includes:

2. The indirect evaporative cooling unit (100) as claimed in claim 1, wherein, ​ A cutoff valve (115) is arranged on each branch of the condenser spraying device (111) to control the opening and closing of each branch of the condenser spraying device (111); When all the cutoff valves (115) are opened, the condenser spraying device (111) is in a cooling mode to cool the condenser (103); or when some of the cutoff valves (115) are opened, the condenser spraying device (111) is in a cleaning mode to clean the condenser (103).

3. The indirect evaporative cooling unit (100) as claimed in claim 2, wherein, The heat exchange core spraying device (116) is connected to the spraying pump (112) to spray the heat exchange core (102) to evaporatively cool the air flowing through the heat exchange core (102). The water supply device (120) comprises:

4. The indirect evaporative cooling unit (100) as claimed in claim 3, wherein, A water storage tank (121) and a water replenishing pump (122), and the water inlet of the water storage tank (121) is connected to the water replenishing pump (122); The water replenishing pump (122) is connected to a water source to replenish the water in the water storage tank (121). The water supply device (120) comprises:

5. The indirect evaporative cooling unit (100) as claimed in claim 4, wherein, A spraying water tank (123) and a water tank water pumping pump (124), and the water inlet of the water storage tank (121) is connected to the spraying water tank (123), and the water tank water pumping pump (124) is connected between the water storage tank (121) and the spraying water tank (123); The spraying water tank (123) is arranged below the condenser spraying device (111) or the heat exchange core spraying device (116) to recover the sprayed water, and the water tank water pumping pump (124) pumps the sprayed water to the water storage tank (121). The water supply device (120) comprises:

6. The indirect evaporative cooling unit (100) as claimed in claim 5, wherein, A filter (125) to filter the water entering the water storage tank (121); At least one filter (125) is connected between the water replenishing pump (122) and the water storage tank (121), and at least one filter (125) is connected between the water storage tank (121) and the spraying water tank (123). The water storage tank (121) comprises:

7. The indirect evaporative cooling unit (100) as claimed in claim 6, wherein, A dosing device (1211) connected to the water storage tank (121) to clean the condenser (103) or the heat exchange core (102). The heat dissipation system (150) comprises a second heat sink (151) and a circulating pump (152), and is used to dissipate heat from the solar photovoltaic and photo-thermal system (200); 8. The indirect evaporative cooling unit (100) as claimed in claim 1, wherein, The second heat sink (151) is connected to the circulating pump (152), the photovoltaic unit (210), and the power supply / battery unit (230). The photovoltaic unit (210) comprises: A tempered glass cover layer (211), a first buffer layer (212), a photovoltaic cell layer (213), a second buffer layer (214), and a substrate layer (215).

9. The indirect evaporative cooling unit (100) as claimed in claim 1, wherein, ​ ​ The first buffer layer (212) is connected between the tempered glass cover layer (211) and the photovoltaic cell layer (213), and the second buffer layer (214) is connected between the photovoltaic cell layer (213) and the substrate layer (215).

10. The indirect evaporative cooling unit (100) as claimed in claim 1, wherein, The radiation refrigeration unit (220) comprises: a radiation refrigeration film (221), a light reflection surface (222), and a circulating pipeline (223); The radiation refrigeration film (221) and the light reflection surface (222) are integrally layered from top to bottom, and the circulating pipeline (223) is connected to the water storage tank (121) to transfer cold energy to the water storage tank (121).

11. The indirect evaporative cooling unit (100) as claimed in claim 8, wherein, The second heat sink (151) is arranged at the outlet of the air outlet flow guide cover (130) to dissipate heat by air flow at the outlet. The second heat sink (151) is arranged at the outlet of the air outlet flow guide cover (130) to dissipate heat by air flow at the outlet.

12. The indirect evaporative cooling unit (100) as claimed in claim 11, wherein, The fan (153) is connected to the first heat sink (142) or the second heat sink (151) to dissipate heat from the first heat sink (142) or the second heat sink (151). The water supply device (120) comprises:

13. The indirect evaporative cooling unit (100) according to any one of claims 1 to 3, characterized in that The regulating valve (126) is connected to a water supply pipeline at the inlet and connected to the spray pump (112) at the outlet. The condenser spray device (111) is arranged below the condenser (103) to spray upward on the condenser (103).

14. The indirect evaporative cooling unit (100) according to any one of claims 1 to 3, characterized in that The condenser spray device (111) is arranged above the condenser (103) to spray downward on the condenser (103).

15. The indirect evaporative cooling unit (100) according to any one of claims 1 to 3, characterized in that ​

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