A phase change cold storage coupled indirect evaporative cooling unit and air conditioning system

Abstract

The utility model discloses a kind of phase-change cold accumulation coupling indirect evaporative cooling unit and air conditioning system, including cooling unit, the cooling unit is parallelly arranged with n pieces of phase-change cold accumulation plate, gap is left between adjacent phase-change cold accumulation plate, form n-1 air passage, the air passage includes primary air passage and secondary air passage, first baffle is arranged in the upper and lower ends of the primary air passage, second baffle is arranged in the left and right ends of the secondary air passage, the airflow direction of the primary air passage and secondary air passage is perpendicular to each other, and water mist spray head assembly is set in the above of this secondary air passage with water tank intercommunication, cooling unit is set in cooling channel. Simple structure, rely on "secondary side evaporative cooling cold accumulation, primary side phase-change latent heat cooling" synergistic mechanism, both meet the data center full load heat dissipation demand, also can avoid into the new air humidity of data center machine room, keep the balance between dehumidification and cooling.

Description

Technical Field

[0001] This utility model relates to the field of temperature and humidity control technology in data centers, specifically to a phase change cold storage coupled indirect evaporative cooling unit and air conditioning system. Background Technology

[0002] With the rapid development of cloud computing and artificial intelligence technologies, the scale and energy consumption of data centers continue to rise, with cooling systems accounting for as much as 40% of energy consumption. In humid climates, data center temperature and humidity control faces a dual challenge: on the one hand, GB50174-2017 "Data Center Design Code" requires that the temperature in the air intake area of ​​the server rack be 18-27℃ and the relative humidity ≤60%. Traditional mechanical cooling systems rely on compressor cooling and electric reheat dehumidification, which results in a cooling-heat offsetting phenomenon, leading to high energy consumption; on the other hand, although direct evaporative cooling technology can utilize natural cold sources, direct contact between air and water film can easily lead to excessive supply air humidity, making it difficult to meet the strict humidity control requirements of data centers.

[0003] In existing technologies, the coupling of phase change cold storage and evaporative cooling is considered an important direction for energy saving, but it still has certain limitations: most solutions only focus on a single phase change cold storage or evaporative cooling function, lacking the ability to adapt to the dynamic heat load of data centers; some coupling solutions adopt direct heat exchange designs, failing to effectively isolate the water film from the primary air supply, making it difficult to achieve a balance between efficient dehumidification and energy-saving cooling. Therefore, a phase change cold storage coupled indirect evaporative cooling unit and air conditioning system is proposed to effectively isolate the water film from the primary air supply, ensuring that the humidity of the air supplied to the data center server room meets the standards. Summary of the Invention

[0004] To solve the above technical problems, this utility model provides a phase change cold storage coupled indirect evaporative cooling unit and air conditioning system that is simple, compact, safe and reliable, and can achieve a balance between efficient dehumidification and energy-saving cooling in data center computer rooms.

[0005] The technical solution is as follows: The first aspect of this utility model provides a phase change cold storage coupled indirect evaporation cooling unit, including a cooling unit, wherein n phase change cold storage plates are arranged in parallel in the cooling unit, and gaps are left between adjacent phase change cold storage plates to form n-1 air channels. The air channels include primary air channels and secondary air channels, wherein odd-numbered air channels are primary air channels and even-numbered air channels are secondary air channels. A first partition connected to a phase change cold storage plate is installed at both the upper and lower ends of the primary air channel, allowing air to flow from left to right. A second partition connected to a phase change cold storage plate is installed at both the left and right ends of the secondary air channel, allowing air to flow from bottom to top. The airflow directions of the primary and secondary air channels are perpendicular to each other. A water mist nozzle assembly connected to a water tank is installed above the secondary air channel. With this structure, the primary and secondary air channels are alternately isolated. The primary air channel continuously cools the primary air using the phase change cold storage plate, while the secondary air channel indirectly cools the primary air through evaporative cooling via the phase change cold storage plate and water mist nozzle assembly, further reducing the temperature of the primary air. Furthermore, the water mist in the secondary air channel will not enter the primary air channel, preventing excessive humidity in the primary air.

[0006] Preferably, the phase change cold storage plate is a stainless steel plate structure, and a paraffin-based phase change material is encapsulated inside it. With this structure, the phase change cold storage plate combines heat transfer and cold storage functions, enabling it to transfer the temperature in the secondary air channel to the primary air channel, thereby cooling the primary air within the primary air channel.

[0007] Preferably, the phase change cold storage plates are arranged side-by-side on the upper part of the water tank, and air inlet filters, communicating with the outside environment and a secondary air passage, are installed on the upper part of the front and rear side walls of the water tank, respectively. A fan is installed in the secondary air passage. With this structure, air can enter the water tank from the air inlet filters, and then enter the secondary air passage. Under the action of the fan, the secondary air is guided to flow from bottom to top. Preferably, a circulating water pipe is also provided within the cooling unit, and a water pump is installed on the circulating water pipe. One end of the circulating water pipe is connected to the water tank, and the other end is arranged along the upper part of the phase change cold storage plate in the cooling unit and connected to the water mist nozzle assembly. With the above structure, water in the water tank can be transported to the water mist nozzle assembly through the circulating water pipe and the water pump, causing it to spray water mist into the secondary air channel. This water mist forms a water film on the surface of the phase change cold storage plate in the secondary air channel. Under the action of the flowing secondary air, the water mist is cooled by evaporation, storing cold for the phase change cold storage plate. Excess water mist falls into the water collection tank, achieving recycling.

[0008] The second aspect of this utility model provides a phase change cold storage coupled indirect evaporative cooling air conditioning system, including a cooling channel with one end connected to an air inlet and the other end connected to a data center server room. A phase change cold storage coupled indirect evaporative cooling unit, as provided in the first aspect of this utility model, is installed within the cooling channel. The airflow direction of the cooling channel is the same as the airflow direction of the primary air channel within the cooling unit. With this structure, air entering the cooling channel is cooled by the cooling unit before being introduced into the data center server room for cooling. Furthermore, the humidity of the air treated by the cooling unit does not exceed the standard, achieving a balance between efficient dehumidification and energy-saving cooling.

[0009] Preferably, the cooling channel also includes a mixing section, a filtering section, and a fan section. The mixing section and the filtering section are sequentially located at the air inlet end of the primary air channel, and the mixing section is connected to the air inlet of the cooling channel. The fan section is located at the air outlet end of the primary air channel and is connected to the data center server room. With this structure, air must be processed through the mixing and filtering sections before entering the cooling unit for further processing. The processed air is then delivered to the data center server room via the fan section, thus achieving temperature control of the data center.

[0010] Preferably, filters are installed between the air inlet and the mixing section of the cooling channel, and between the fan section and the air outlet of the cooling channel. This structure filters out certain impurities in the air, preventing them from affecting the cooling effect of the air conditioning system, and also preventing impurities from entering the data center's server room and affecting the operation or heat dissipation of the equipment there.

[0011] Preferably, several fans are arranged in parallel inside the fan section. With this structure, the fans can deliver cooled air from the cooling unit into the data center server room, thereby cooling the data center server room.

[0012] Preferably, a return air duct is also provided on the cooling channel, and the return air duct is connected to both the data center server room and the mixing section. With this structure, when the outdoor air temperature is too low, it can be adjusted through the return air duct connected to the data center server room.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: the system is safe and reliable, with a simple and compact structure, which can save installation space and investment costs. It combines two air channels with mutually perpendicular airflow directions in the cooling unit, but the two are isolated from each other. The primary air channel introduces fresh air, and the secondary air channel provides cooling to the phase change cold storage plate through indirect evaporative cooling, thereby transferring the temperature to the fresh air in the primary air channel, realizing continuous cooling to the primary air channel. This can not only meet the full-load heat dissipation requirements of the data center, but also avoid excessive humidity of the fresh air entering the data center server room, achieving a balance between efficient dehumidification and energy-saving cooling. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the cooling unit. Figure 2 This is a schematic diagram of the structure of the primary air passage 2a; Figure 3 This is a schematic diagram of the secondary air channel 2b. Figure 4 This is a schematic diagram of the primary air passage 2a and the secondary air passage 2b; Figure 5 This is a schematic diagram of a cooling air conditioning system. Detailed Implementation

[0015] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0016] like Figures 1 to 4 As shown, a phase change cold storage coupled indirect evaporation cooling unit includes a cooling unit 1. The cooling unit has n phase change cold storage plates 2 arranged in parallel, where the number of n is greater than or equal to 4. There is a gap between adjacent phase change cold storage plates 2, forming n-1 air channels. The air channels include primary air channels 2a and secondary air channels 2b, wherein the odd-numbered air channels are primary air channels 2a and the even-numbered air channels are secondary air channels 2b. A first partition 2c connected to the phase change cold storage plate 2 is provided at both the upper and lower ends of the primary air channel 2a, and the air in the primary air channel 2a flows from left to right. A second partition 2d connected to the phase change cold storage plate 2 is provided at both the left and right ends of the secondary air channel 2b, and the air in the secondary air channel 2b flows from bottom to top. The airflow directions of the primary air channel 2a and the secondary air channel 2b are perpendicular to each other. A water mist nozzle assembly 4 connected to the water tank 3 is provided above the secondary air channel 2b.

[0017] The phase change cold storage plate 2 is a stainless steel plate structure, encapsulated with paraffin-based phase change material. The plate has a thickness of 2-3 cm, a length of 1-2 m, a height of 2.5-3 m, a phase change temperature of 19-21℃, and a latent heat of phase change of 240-260 kJ / kg, simultaneously serving as both a heat transfer and cold storage device. The primary air channel 2a has a width of 5-8 cm, and the secondary air channel 2b has a width of 4-5 cm.

[0018] The phase change cold storage plates 2 are arranged side by side on the upper part of the water tank 3. The water tank 3 can provide certain support and fixation for the phase change cold storage plates 2. Air inlet filters 3a, which are connected to the outside and the secondary air channel 2b respectively, are installed on the upper part of the front and rear side walls of the water tank 3. A fan is installed in the secondary air channel 2b. A circulating water pipe 5 is also installed in the cooling unit 1, and a water pump 5a is installed on the circulating water pipe 5. One end of the circulating water pipe 5 is connected to the water tank 3, and the other end is arranged along the phase change cold storage plate 2 at the top of the cooling unit 1 and connected to the water mist nozzle assembly 4. The water is transported to the water mist nozzle assembly 4 through the water pump 5a and the circulating water pipe 5. The water mist sprayed by the water mist nozzle assembly 4 will be spread on the surface of the phase change cold storage plate 2 in the secondary air channel 2b and form a water film. When the secondary air entering from the water tank 3 flows through the secondary air channel 2b, the fresh air is cooled by evaporation to store cold for the phase change cold storage plate 2, so that it can continuously supply cooling for the primary air channel 2a, further reducing the temperature of the fresh air in the primary air channel 2a. Since both the primary air channel 2a and the secondary air channel 2b are equipped with baffles, the water mist in the secondary air channel 2b will not enter the primary air channel 2a and will not increase the humidity of the primary air, so that the air sent into the data center server room meets the requirements of humidity and temperature at the same time. Excess water mist falls into the water tank 3 and is then transported to the water mist nozzle assembly 4 via the water pump 5a and the circulating water pipe 5, thus realizing the recycling of water resources and reducing waste.

[0019] A phase change cold storage coupled indirect evaporative cooling air conditioning system includes a cooling channel with one end connected to an air inlet and the other end connected to a data center computer room. A phase change cold storage coupled indirect evaporative cooling unit as described above is installed in the cooling channel. The airflow direction of the cooling channel is the same as the airflow direction of the primary air channel 2a in the cooling unit 1.

[0020] The cooling channel also includes a mixing section 6, a filtering section 7, and a fan section 8. The mixing section 6 and the filtering section 7 are sequentially located at the air inlet end of the primary air channel 2a, and the mixing section 6 is connected to the air inlet of the cooling channel. The fan section 8 is located at the air outlet end of the primary air channel 2a and is connected to the data center server room. After air enters the mixing section 6 and the filtering section 7 from the air inlet of the cooling channel, it is cooled in the cooling unit 1 and then sent into the data center server room by the fan of the fan section 8 for further cooling.

[0021] Filters 9 are installed between the air inlet and the mixing section 6 of the cooling channel, and between the fan section 8 and the air outlet of the cooling channel. These filters remove certain impurities from the air, preventing them from affecting the cooling effect of the air conditioning system and preventing impurities from entering the data center's server room and affecting the operation or heat dissipation of the equipment. Several fans are arranged in parallel inside the fan section 8. These fans deliver the cooled air from the cooling unit into the data center's server room, thus cooling the server room.

[0022] A return air duct 10 is also provided on the cooling channel. The return air duct 10 is connected to the data center computer room and the mixing section 6 respectively. The airflow direction of the return air duct 10 is opposite to the airflow direction of the cooling channel 1. When the outdoor fresh air temperature is too low, it can be adjusted through the return air duct 10.

[0023] This system relies on a synergistic mechanism of "secondary-side evaporative cooling and cold storage, and primary-side phase change latent heat cooling" to enhance the system's cold storage capacity under natural ventilation conditions. It can effectively cool the data center and has a simple, compact structure that is easy to manufacture, saving installation space and investment costs. During the use of this system, water resources can be conserved through the circulating water pipe 5.

[0024] Finally, it should be noted that the above description is merely a preferred embodiment of the present utility model. Those skilled in the art, under the guidance of the present utility model, can make various similar representations without departing from the spirit and claims of the present utility model, and such modifications all fall within the protection scope of the present utility model.

Claims

1. A phase change cold storage coupled indirect evaporation cooling unit, comprising a cooling unit (1), characterized in that: The cooling unit has n phase change cold storage plates (2) arranged in parallel, with gaps between adjacent phase change cold storage plates (2) to form n-1 air channels. The air channels include primary air channels (2a) and secondary air channels (2b). Odd-numbered air channels are primary air channels (2a), and even-numbered air channels are secondary air channels (2b). At both ends of the primary air channel (2a), there are first partitions (2c) connected to the phase change cold storage plate (2). The air in the primary air channel (2a) flows from left to right. At both ends of the secondary air channel (2b), there are second partitions (2d) connected to the phase change cold storage plate (2). The air in the secondary air channel (2b) flows from bottom to top. The airflow directions of the primary air channel (2a) and the secondary air channel (2b) are perpendicular to each other. A water mist nozzle assembly (4) connected to the water tank (3) is provided above the secondary air channel (2b).

2. The phase change cold storage coupled indirect evaporation cooling unit according to claim 1, characterized in that: The phase change cold storage plate (2) is a stainless steel plate structure, and is encapsulated with paraffin-based phase change material inside.

3. A phase change cold storage coupled indirect evaporation cooling unit according to claim 1 or 2, characterized in that: The phase change cold storage plate (2) is arranged in parallel on the upper part of the water tank (3), and an air inlet filter (3a) is installed on the upper part of the front and rear side walls of the water tank (3), which is connected to the outside and the secondary air channel (2b) respectively, and a fan is installed in the secondary air channel (2b).

4. The phase change cold storage coupled indirect evaporation cooling unit according to claim 3, characterized in that: A circulating water pipe (5) is also provided in the cooling unit (1), and a water pump (5a) is also provided on the circulating water pipe (5). One end of the circulating water pipe (5) is connected to the water tank (3), and the other end is arranged along the phase change cold storage plate (2) on the upper part of the cooling unit (1) and connected to the water mist nozzle assembly (4).

5. A phase change cold storage coupled indirect evaporative cooling air conditioning system, characterized in that: It includes a cooling channel with one end connected to the air inlet and the other end connected to the data center computer room. A phase change cold storage coupled indirect evaporation cooling unit as described in any one of claims 1-4 is provided in the cooling channel. The airflow direction of the cooling channel is the same as the airflow direction of the primary air channel (2a) in the cooling unit (1).

6. The phase change cold storage coupled indirect evaporative cooling air conditioning system according to claim 5, characterized in that: The cooling channel is also provided with a mixing section (6), a filtering section (7) and a fan section (8). The mixing section (6) and the filtering section (7) are arranged sequentially at the air inlet end of the primary air channel (2a), and the mixing section (6) is connected to the air inlet of the cooling channel. The fan section (8) is arranged at the air outlet end of the primary air channel (2a) and is connected to the data center computer room.

7. A phase change cold storage coupled indirect evaporative cooling air conditioning system according to claim 6, characterized in that: A filter screen (9) is provided between the air inlet and the mixing section (6) of the cooling channel, and between the fan section (8) and the air outlet of the cooling channel.

8. A phase change cold storage coupled indirect evaporative cooling air conditioning system according to claim 7, characterized in that: Several fans are arranged in parallel inside the fan section (8).

9. A phase change cold storage coupled indirect evaporative cooling air conditioning system according to claim 6, characterized in that: A return air duct (10) is also provided on the cooling channel, and the return air duct (10) is connected to the data center computer room and the mixing section (6) respectively.

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