A self-cleaning fresh air cooling system suitable for data center machine rooms in cold regions and an intelligent control method thereof

Abstract

The application discloses a self-purification fresh air cooling system suitable for a data center machine room in a cold region and an intelligent control method thereof, and relates to the technical field of air conditioning. The system comprises a machine room, and data center cabinets, a machine room air conditioner and a machine room self-purification fresh air cooling unit are arranged in the machine room respectively. An outer side air outlet of the machine room self-purification fresh air cooling unit is communicated with a self-vertical louver air outlet through a pipeline and an electric sealing air valve, an outer side fresh air outlet is communicated with the louver air outlet through a pipeline and an electric sealing air valve, and an inner side fresh air outlet is communicated with an upper portion of the machine room air conditioner through a pipeline. A lower portion of the machine room air conditioner is communicated with a lower portion of the data center cabinet through a fan, a lower air outlet and a cabinet air inlet, and an upper portion of the data center cabinet is communicated with a return air pipeline through a cabinet air outlet and a return air outlet. The application can be widely used in air conditioning rooms with large indoor equipment heat dissipation and indoor temperature control requirements, such as data center machine rooms, and has a wide application prospect in cold regions of China, especially in the northeast, north China and northwest China.

Description

Technical Field

[0001] This invention belongs to the field of cooling system technology, and relates to a self-cleaning fresh air cooling system suitable for data center computer rooms in cold regions and its intelligent control method. Background Technology

[0002] Data center server rooms generate a large amount of heat, with air conditioning accounting for over 90% of the room's total cooling load. To ensure the safe operation of this equipment, the server room temperature must be maintained below 25°C year-round, necessitating year-round air conditioning. Currently, almost all server room air conditioning systems rely on electrically powered dedicated chiller units, resulting in high annual electricity costs. To reduce these costs, utilizing the natural cooling capacity of outdoor fresh air during winter and transitional seasons could significantly lower operating expenses.

[0003] In addition, to fully utilize the cooling capacity of fresh air, heat recovery equipment is often installed in air conditioning units. Among these, heat recovery rotors, as a commonly used energy-saving device, are frequently used in air conditioning, ventilation, dust removal, refrigeration, and chemical industries. In the air conditioning field, heat recovery rotors need to be used in conjunction with filters to achieve the functions of filtering fresh air and controlling pollutant concentrations. However, traditional filters need to be replaced promptly after a period of use, and their lifespan is even shorter in applications with large fresh air volumes.

[0004] Therefore, inventing a fresh air cooling system and its intelligent control method that can fully utilize the natural cooling capacity of outdoor fresh air during winter and transitional seasons and achieve self-cleaning function has great practical value. By cooperating with existing dedicated air conditioning units for computer rooms, it can solve the problem of cooling the computer room throughout the year and saving on the operating costs of computer room air conditioning. Summary of the Invention

[0005] The purpose of this invention is to provide a self-cleaning fresh air cooling system and its intelligent control method suitable for data center computer rooms in cold regions, so as to achieve year-round air conditioning cooling of data center computer rooms, save on air conditioning operating costs, and maintain the continuous operation of fresh air units for a long period of time.

[0006] The technical solution adopted in this invention is as follows:

[0007] A self-cleaning fresh air cooling system suitable for data center server rooms in cold regions includes a server room consisting of an upper beam, two side exterior walls, and a lower prefabricated slab. A dedicated outdoor air conditioning unit is installed on the exterior of the server room. Inside the server room, data center cabinets, server room air conditioners, and a self-cleaning fresh air cooling unit are respectively installed. The data center cabinets are placed within a space consisting of a ceiling, partition walls, and a raised floor. A downward air outlet is formed between the raised floor and the lower prefabricated slab. The lower part of the data center cabinet has an air inlet, and the upper part has an air outlet. The computer room air conditioner has a heat exchange coil connected to a dedicated outdoor air conditioning unit via pipes. The self-cleaning fresh air cooling unit is located near one exterior wall, which has an exterior window with self-closing louvered air vents and louvered air vents arranged sequentially from top to bottom. The outer exhaust vent of the self-cleaning fresh air cooling unit is connected to the self-closing louvered air vent via pipes and an electrically operated airtight valve. The outer fresh air inlet of the self-cleaning fresh air cooling unit is connected to the louvered air vent via pipes and an electrically operated airtight valve. The inner fresh air inlet is connected to the upper part of the computer room air conditioner via pipes. The lower part of the computer room air conditioner is connected to the lower part of the data center cabinet via a fan, a downflow air outlet, and a cabinet air inlet. The upper part of the data center cabinet is connected to the return air duct via the cabinet air outlet and a return air outlet on the ceiling. One end of this return air duct connects to the upper part of the computer room air conditioner via an electrically operated airtight valve, and the other end connects to the inner exhaust outlet of the computer room self-cleaning fresh air cooling unit via an electrically operated airtight valve. The computer room self-cleaning fresh air cooling unit includes a casing and its internal heat recovery impeller, self-cleaning impeller filter, filter speed adjustment plate, motor, and fresh air supply system. The system includes a fan, an exhaust fan, a partition, a fresh air inlet, an exhaust outlet, and a motor conveyor belt. A filter speed adjustment plate is located between the heat recovery impeller and the self-cleaning impeller filter. The fresh air fan is located between the self-cleaning impeller filter and the fresh air inlet. The exhaust fan is located between the self-cleaning impeller filter and the exhaust outlet. The fresh air fan and the exhaust fan are separated by a partition. The heat recovery impeller and the self-cleaning impeller filter are driven by motors via a motor conveyor belt. The interiors of the fresh air inlet and the exhaust outlet on the heat recovery impeller side are also separated by partitions.

[0008] An intelligent control method for a self-cleaning fresh air cooling system suitable for data center computer rooms in cold regions includes the following steps:

[0009] 1) Energy-saving adaptive setting of indoor temperature: Optimizes the indoor temperature setting based on the outdoor temperature;

[0010] 2) Intelligent control of fresh air ratio: Adjust the opening of the electric air-sealing valves on the exhaust and fresh air ducts of the self-cleaning fresh air cooling unit in the computer room according to the outdoor temperature, so that the room temperature is maintained within the set value range.

[0011] 3) Start-stop control of the compressor in the outdoor unit of the dedicated air conditioner: The start and stop of the compressor are determined according to the outdoor temperature;

[0012] 4) Intelligent self-cleaning control of the filter: The opening of the air speed regulating plate is controlled according to the pressure difference before and after the filter.

[0013] This invention can be widely used in air-conditioned rooms such as data center computer rooms where indoor equipment has a large heat dissipation and requires temperature control. It has broad application prospects in my country, especially in cold regions such as Northeast, North and Northwest China.

[0014] The present invention has the following beneficial effects:

[0015] 1. This invention utilizes the combined operation of a self-cleaning fresh air cooling unit and a computer room air conditioner throughout the year. In winter and transitional seasons, it can maximize the use of natural cooling capacity from outdoor fresh air, while only activating the computer room air conditioner during the hot summer months, significantly reducing the operating costs of existing air conditioning systems in the computer room.

[0016] 2. The self-cleaning fresh air cooling unit in the computer room can realize functions such as fresh air collection, fresh air filtration, automatic filter cleaning, exhaust heat recovery, and automatic adjustment of fresh air volume and exhaust air volume.

[0017] 3. The wind speed regulating plate in the self-cleaning fresh air cooling unit in the computer room is used to adjust the back-blowing wind speed and achieve the best dust removal effect.

[0018] 4. The heat recovery rotor and self-cleaning rotor filter of the self-cleaning fresh air cooling unit in the computer room are both equipped with motors, which can achieve the effect of separate control as needed. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the self-cleaning fresh air cooling unit for computer rooms of the present invention;

[0021] Figure 3 for Figure 2 Side view;

[0022] Figure 4 for Figure 2 AA section view;

[0023] Figure 5 for Figure 2 BB section view;

[0024] Figure 6 for Figure 2 CC section view;

[0025] Figure 7 This is a process flow diagram of the intelligent control method of the present invention.

[0026] In the diagram: 1-Self-cleaning fresh air cooling unit for computer room; 2-Electric airtight damper; 3-Self-closing louvered air vent; 4-Louvre air vent; 5-Computer room air conditioner; 6-Heat exchange coil; 7-Dedicated air conditioner outdoor unit; 8-Downflow air vent; 9-Data center cabinet; 10-Cabinet air inlet; 11-Cabinet air outlet; 12-Return air vent; 13-Raised floor; 14-Partition wall; 15-Ceiling; 16-Return air duct; 17-Exterior wall; 18- 19-Exterior window, 20-Upper beam, 21-Precast slab, 22-Heat recovery rotor, 23-Self-cleaning rotor filter, 24-Filter wind speed regulating plate, 25-Motor, 26-Fresh air fan, 27-Partition, 28-Casing, 29-Fresh air inlet, 30-Exhaust air outlet, 31-Motor conveyor belt, 32-Controller, 33-Fresh air temperature sensor, 34-Supply air temperature sensor, 35-Differential pressure sensor. Detailed Implementation

[0027] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and technical solutions.

[0028] like Figure 1As shown, the present invention discloses a self-cleaning fresh air cooling system suitable for data center computer rooms in cold regions, comprising a computer room consisting of an upper beam 19, two side exterior walls 17, and a lower prefabricated slab 20, with a dedicated outdoor air conditioning unit 7 located on the outside of the computer room. Inside the computer room are data center cabinets 9, a computer room air conditioner 5, and a self-cleaning fresh air cooling unit 1. The data center cabinets 9 are placed within a space consisting of a ceiling 15, partition walls 14, and a raised floor 13. A downward air outlet 8 is formed between the raised floor 13 and the lower prefabricated slab 20. The lower part of the data center cabinets 9 has a cabinet air inlet 10, and the upper part has a cabinet air outlet 11. The computer room air conditioner 5 has a heat exchange coil 6 connected to the dedicated outdoor air conditioning unit 7 via pipes. The self-cleaning fresh air cooling unit 1 is located near one side exterior wall 17, which has an exterior window 18 with self-closing louvered air vents 3 and louvered air vents 4 arranged sequentially from top to bottom. The outer exhaust vent 30 of the self-cleaning fresh air cooling unit is connected to the self-closing louvered vent 3 via a duct and an electrically operated airtight valve 2. The outer fresh air vent 29 of the self-cleaning fresh air cooling unit 1 is connected to the louvered vent 4 via a duct and an electrically operated airtight valve 2. The inner fresh air vent 29 is connected to the upper part of the air conditioner 5 in the computer room via a duct. The lower part of the air conditioner 5 is connected to the lower part of the data center cabinet 9 via a fan, a bottom air outlet 8, and a cabinet air inlet 10. The upper part of the data center cabinet 9 is connected to the return air duct 16 via the cabinet air outlet 11 and the return air outlet 12 set on the ceiling 15. One of the return air ducts 16 is connected to the upper part of the air conditioner 5 via an electrically operated airtight valve 2, and the other is connected to the inner exhaust vent 30 of the self-cleaning fresh air cooling unit via an electrically operated airtight valve 2. The self-cleaning fresh air cooling unit 1 for computer rooms includes a casing 28 and its internal components: a heat recovery rotor 21, a self-cleaning rotor filter 22, a filter speed regulating plate 23, a motor 24, a fresh air fan 25, an exhaust fan 26, a partition 27, a fresh air inlet 29, an exhaust outlet 30, and a motor conveyor belt 31. The filter speed regulating plate 23 is located between the heat recovery rotor 21 and the self-cleaning rotor filter 22. The fresh air fan 25 is located between the self-cleaning rotor filter 22 and the fresh air inlet 29. The exhaust fan 26 is located between the self-cleaning rotor filter 22 and the exhaust outlet 30. The fresh air fan 25 and the exhaust fan 26 are separated by the partition 27. The heat recovery rotor 21 and the self-cleaning rotor filter 22 are each driven by the motor 24 via the motor conveyor belt 31. The interiors corresponding to the fresh air inlet 29 and the exhaust outlet 30 on the side of the heat recovery rotor 21 are also separated by the partition 27.

[0029] The working process of the self-cleaning fresh air cooling unit 1 in the computer room is as follows: The motor 24 of the self-cleaning rotary filter 22 and the heat recovery rotary wheel 21 is turned on. Fresh air enters the left fresh air chamber from the right fresh air chamber through the outer fresh air inlet 29, and then exits from the inner fresh air outlet 29. At the same time, heat (cold energy) is absorbed from the heat recovery rotary wheel 21, and dust is attached to the self-cleaning rotary filter 22. Exhaust air enters the right exhaust air chamber from the left exhaust air chamber through the inner exhaust air outlet 30, and then exits from the outer exhaust air outlet 30. At the same time, heat (cold energy) is transferred to the heat recovery rotary wheel 21, which blows off the dust attached to the self-cleaning rotary filter 22 and carries it outdoors.

[0030] like Figure 7 As shown, the specific steps of the intelligent control method of the present invention are as follows:

[0031] 1. Energy-saving adaptive setting of indoor temperature:

[0032] The reference range for the indoor temperature setpoint of the data center can be determined according to relevant standards and specifications. The outdoor temperature is measured by the fresh air temperature sensor 33. When the outdoor temperature is ≥20℃ (adjustable), the indoor temperature setpoint is maintained at the lower limit of the reference range; when the outdoor temperature is <12℃ (adjustable), the indoor temperature setpoint is maintained at the upper limit of the reference range; when 12℃ ≤ outdoor temperature <20℃ (adjustable), the indoor temperature setpoint is linearly corrected.

[0033] 2. Intelligent control of fresh air ratio:

[0034] When summer arrives: the fresh air temperature sensor 33 measures the fresh air temperature and feeds this signal back to the controller 32. When the fresh air temperature is ≥20℃ (adjustable), the controller 32 sends a signal to keep the electric fresh air valve 2 at the minimum opening of 15% (adjustable) and the return air valve at the maximum opening of 85% (adjustable) to ensure the minimum fresh air volume requirement.

[0035] When winter and the transitional season arrive: the fresh air temperature sensor 33 measures the fresh air temperature and feeds this signal back to the controller 32. When the fresh air temperature is between 12℃ and 20℃ (adjustable), the controller 32 sends a signal to keep the fresh air valve at its maximum opening of 100% and close the return air valve. When the fresh air temperature is less than 12℃ (adjustable), the controller 32 sends a signal to adjust the opening of the fresh air valve and the return air valve to ensure that the supply air temperature is within the set range. This fully utilizes the cooling capacity of the fresh air during winter and the transitional season for cooling.

[0036] 3. Start-stop control of the compressor in a dedicated air conditioning unit:

[0037] When summer arrives: due to the high outdoor temperature and high enthalpy of fresh air, it is impossible to fully utilize fresh air to cool the computer room, and it is necessary to use dedicated air conditioning units for the computer room to provide cooling capacity.

[0038] When winter and the transitional season arrive, due to the low outdoor temperature and low enthalpy of fresh air, fresh air can be used for cooling of the computer room in whole or in part. At this time, it is not necessary to turn on the dedicated air conditioning unit for the computer room or only partially turn it on, so as to save the operating cost of the computer room.

[0039] The specific control methods for starting and stopping the compressor of a dedicated air conditioning unit are as follows:

[0040] The supply air temperature is measured by the supply air temperature sensor 34 and this signal is fed back to the controller 32. If the supply air temperature is ≤16℃ (adjustable) and lasts for 10 minutes (adjustable), the controller 32 sends a signal to shut down the compressor of the computer room dedicated air conditioning unit; if the supply air temperature is >16℃ (adjustable) and lasts for 10 minutes (adjustable), the controller 32 sends a signal to turn on the compressor of the computer room dedicated air conditioning unit.

[0041] 4. Intelligent self-cleaning control of the filter:

[0042] The differential pressure sensor 35 measures the pressure difference ΔP before and after the filter and feeds this signal back to the controller 32. If ΔP ≥ the upper limit of the differential pressure setting, the controller 32 sends a signal to set the fan speed regulating plate in the computer room's fresh air cooling unit to the minimum opening of 30% (adjustable). If ΔP < the lower limit of the differential pressure setting, the controller 32 sends a signal to set the fan speed regulating plate in the computer room's fresh air cooling unit to the maximum opening of 100% (adjustable). If the lower limit of the differential pressure setting ≤ ΔP < the upper limit of the differential pressure setting, the controller 32 sends a signal to adjust the opening of the fan speed regulating plate in the computer room's fresh air cooling unit according to a linear relationship. This achieves the best backflushing self-cleaning effect.

Claims

1. A self-cleaning fresh air cooling system suitable for data center computer rooms in cold regions, comprising a computer room consisting of an upper beam (19), two side exterior walls (17), and a lower precast slab (20), wherein a dedicated air conditioning outdoor unit (7) is provided on the outside of the computer room; characterized in that, Inside the computer room, there are data center cabinets (9), computer room air conditioners (5), and a self-cleaning fresh air cooling unit (1). The data center cabinets (9) are placed in a space consisting of a ceiling (15), partition walls (14), and a raised floor (13). A down-flow air vent (8) is formed between the raised floor (13) and the lower prefabricated slab (20). The lower part of the data center cabinets (9) has a cabinet air inlet (10), and the upper part of the data center cabinets (9) has a cabinet air outlet (11). The computer room air conditioner (5) has a heat exchange coil (6) that is connected to a dedicated outdoor air conditioning unit (7) through a pipe. The self-cleaning fresh air cooling unit (1) is located near one side of the exterior wall (17). (17) is provided with an external window (18) with a self-closing louvered air vent (3) and a louvered air vent (4) arranged from top to bottom; the outer exhaust vent (30) of the computer room self-cleaning fresh air cooling unit (1) is connected to the self-closing louvered air vent (3) through a pipe and an electric airtight valve (2); the outer fresh air vent (29) of the computer room self-cleaning fresh air cooling unit (1) is connected to the louvered air vent (4) through a pipe and an electric airtight valve (2); the inner fresh air vent (29) is connected to the upper part of the computer room air conditioner (5) through a pipe; the lower part of the computer room air conditioner (5) is connected to the lower part of the data center cabinet (9) through a fan, a lower air outlet (8) and a cabinet air inlet (10); the upper part of the data center cabinet (9) is connected to the cabinet through the cabinet The air outlet (11) and the return air outlet (12) set on the ceiling (15) are connected to the return air duct (16). One of the return air ducts (16) is connected to the upper part of the computer room air conditioner (5) through the electric airtight valve (2), and the other is connected to the inner exhaust vent (30) of the computer room self-cleaning fresh air cooling unit through the electric airtight valve (2). The computer room self-cleaning fresh air cooling unit (1) includes a casing (28) and its internal heat recovery rotor (21), self-cleaning rotor filter (22), filter wind speed adjustment plate (23), motor (24), fresh air fan (25), exhaust fan (26), partition (27), fresh air inlet (29), exhaust vent (30) and motor conveyor belt (3). 1) The filter speed adjustment plate (23) is located between the heat recovery rotor (21) and the self-cleaning rotor filter (22). The filter speed adjustment plate (23) adjusts its opening according to the pressure difference before and after the filter. The pressure difference ΔP before and after the filter is measured by the pressure difference sensor. If ΔP ≥ the upper limit of the pressure difference setting value, the speed adjustment plate in the fresh air cooling unit of the computer room is set to the minimum opening of 30%. If ΔP < the lower limit of the pressure difference setting value, the speed adjustment plate in the fresh air cooling unit of the computer room is set to the maximum opening of 100%. If the lower limit of the pressure difference setting value ≤ ΔP < the upper limit of the pressure difference setting value, the opening of the speed adjustment plate in the fresh air cooling unit of the computer room is adjusted according to the linear relationship to achieve the effect of backflushing and self-cleaning.The fresh air fan (25) is located between the self-cleaning rotary filter (22) and the fresh air inlet (29), and the exhaust fan (26) is located between the self-cleaning rotary filter (22) and the exhaust outlet (30). The fresh air fan (25) and the exhaust fan (26) are separated by a partition (27). The heat recovery rotary wheel (21) and the self-cleaning rotary filter (22) are driven by a motor (24) via a motor conveyor belt (31). The interiors of the fresh air inlet (29) and the exhaust outlet (30) on the side of the heat recovery rotary wheel (21) are also separated by a partition (27).

2. An intelligent control method for a self-cleaning fresh air cooling system suitable for data center computer rooms in cold regions as described in claim 1, comprising the following steps: 1) Energy-saving adaptive setting of indoor temperature: Optimizes the indoor temperature setting based on the outdoor temperature; 2) Intelligent control of fresh air ratio: Adjust the opening of the electric air-sealing valves on the exhaust and fresh air ducts of the self-cleaning fresh air cooling unit in the computer room according to the outdoor temperature, so that the room temperature is maintained within the set value range. 3) Start-stop control of the compressor in the outdoor unit of the dedicated air conditioner: The start and stop of the compressor are determined according to the outdoor temperature; 4) Intelligent self-cleaning control of the filter: The opening of the air speed regulating plate is controlled according to the pressure difference before and after the filter.

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