CN112118706A - Data center complete direct evaporation natural cooling system and control method thereof - Google Patents
Data center complete direct evaporation natural cooling system and control method thereof Download PDFInfo
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- 238000001816 cooling Methods 0.000 title claims abstract description 20
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- 238000001704 evaporation Methods 0.000 title claims abstract description 8
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- 238000010586 diagram Methods 0.000 claims abstract description 14
- 238000004378 air conditioning Methods 0.000 claims description 36
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- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000007664 blowing Methods 0.000 description 6
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20709—Modifications to facilitate cooling, ventilating, or heating for server racks or cabinets; for data centers, e.g. 19-inch computer racks
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20709—Modifications to facilitate cooling, ventilating, or heating for server racks or cabinets; for data centers, e.g. 19-inch computer racks
- H05K7/208—Liquid cooling with phase change
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Abstract
The invention discloses a complete direct evaporation natural cooling system of a data center and a control method thereof, which relate to the technical field of heat energy and comprise the following steps: the enthalpy-equalizing humidifying device, the air supply fan, the return air fan, the filter screen, the controller, the sensor and the like can realize complete natural cooling without mechanical refrigeration, thereby reducing energy waste, improving the energy utilization rate, saving energy and protecting environment. The control mode is that different working set points are set according to different regions divided by an enthalpy diagram, stable and reliable parameter control can be realized, the condition that the temperature and the humidity of a fresh air direct cooling system in a conventional design are unstable is avoided, meanwhile, the natural cooling working time of a data center can be prolonged, and energy conservation in a larger degree is realized.
Description
Technical Field
The invention relates to the technical field of heat energy, in particular to a direct evaporation data center cooling system capable of realizing complete natural cooling and a control method thereof.
Background
With the rapid development of cloud computing and big data technology, the data center is larger and larger in scale, and the power consumption is higher and higher. Research shows that the energy consumption of the data center accounts for about 2% of the national electricity consumption and is in a rising trend. In addition, research also shows that the energy consumption of the air conditioning system accounts for about 70% of the energy consumption of the data center, except for IT equipment, and the demand for reducing the energy consumption of the air conditioning system of the data center is very urgent.
Disclosure of Invention
The invention aims to provide a direct evaporative cooling system capable of realizing complete natural cooling and a control and working mode thereof, which can realize no mechanical refrigeration in regions with proper climate all the year around, thereby reducing energy waste, improving energy utilization rate, saving energy and protecting environment.
Meanwhile, the invention also provides a control method for partitioning according to outdoor meteorological conditions, so that stable parameter control can be realized, and the condition of air supply temperature and humidity fluctuation of the conventional system is avoided.
The technical scheme for solving the technical problems is as follows:
a data center complete direct evaporation natural cooling system comprises an air conditioning unit 20 and a machine room module 30, wherein the air conditioning unit and the machine room module are connected through an air pipe 40; the air conditioning unit comprises an air supply part and an air return part; the machine room module comprises an IT equipment cabinet 1, a cold channel 2, a hot channel 3 and a ceiling return air layer 4; outdoor fresh air firstly enters a cold channel through an air supply part of the air conditioning unit, IT equipment in an IT equipment cabinet generates heat to heat air, the IT equipment exhausts the air to a hot channel, and the air in the hot channel is totally or partially removed and partially mixed with the fresh air of the air supply part after entering the air return part of the air conditioning unit through a ceiling return air layer; the system further comprises a controller 5, the controller 5 is in communication connection with the air conditioning unit and the machine room module, and the system is controlled to operate.
In the above technical solution, further, according to the air path, the air supply part sequentially includes a fresh air control valve 6, a fresh air filter 7, an isenthalpic humidifying device, and an air supply fan 8; outdoor fresh air enters the air conditioning unit through a fresh air control valve 6, is filtered by a fresh air filter 7, passes through an isenthalpic humidifying device, and is sent into a machine room module 30 through an air duct by an air supply fan 8;
according to the air path, the air return part sequentially comprises an air return fan 9, an exhaust control valve 10, an air return filter 11 and an air mixing control valve 12; air in the hot channel of the machine room module is sucked into the machine set by a return air fan 9, one part of return air is discharged by an exhaust control valve 10, the other part of return air enters a return air filter 11 and then is mixed with fresh air by a mixed air control valve 12; or the return air is completely discharged by the exhaust control valve 10;
the fresh air control valve 6, the equal enthalpy humidifying device, the air supply fan 8, the return air fan 9, the exhaust control valve 10 and the air mixing control valve 12 are in communication connection with the controller 5 and controlled to work by the controller.
In the technical scheme, further, a pressure difference sensor 13 is arranged in the air return part inside the air conditioning unit and outside the air conditioning unit, and is in communication connection with the controller 5, and the rotating speed of the air return fan is controlled through the internal and external pressure difference;
the machine room module is characterized in that the cold channel and the hot channel are respectively provided with a temperature sensor 14, the temperature sensors are in communication connection with the controller 5, and the rotating speed of the air feeder is controlled through the temperature difference between the cold channel and the hot channel.
In the above technical scheme, further, the air conditioning unit is provided with at least 4 temperature and humidity sensors, and according to the wind path, the temperature and humidity sensors are respectively arranged before the fresh air control valve, before the isenthalpic humidifying device, before the air supply fan and after the air return fan, and are in communication connection with the controller and used for collecting the temperature and humidity values of the indoor and outdoor air of the air conditioning unit.
In the above technical solution, further, the isenthalpic humidifying device is composed of a spraying or shower head 15, a variable frequency water pump 16 and a water collecting tray 17, wherein the variable frequency water pump 16 is in communication connection with the controller 5.
In the above technical scheme, further, the air conditioning unit can be a plurality of and be a set of, install in computer lab module side or top surface, all be connected with the computer lab module through the tuber pipe.
A control method of a data center complete direct evaporation natural cooling system comprises the following steps:
step 1: aiming at air supply parameters of the air conditioning unit, two ranges are defined, wherein one range is a recommended range, the other range is an allowable range, and the recommended range is smaller than or equal to the allowable range; the recommended range and the allowable range are defined by setting temperature and humidity values;
step 2: according to different recommended ranges and allowed ranges, all outdoor temperature, humidity and weather conditions are divided into 10 areas A1, A2, B1, B2, C, D1, D2, D3, D4 and E, wherein the 10 areas A1, B2, C, D3 and D4 are areas enabling the data center to work in the recommended ranges, the areas E enabling the data center to work out of the allowed ranges, and the other areas enabling the data center to work between the recommended ranges and the allowed ranges;
and step 3: controlling the opening of the air mixing valve by different control parameter set points according to the area where the outdoor meteorological parameters are located;
and 4, step 4: according to the area where the outdoor meteorological parameters are located, when fresh air or mixed air of the fresh air and return air passes through the isenthalpic humidifying device, the isenthalpic humidifying control point is controlled.
In the above technical solution, further, the step 2 specifically includes the following steps:
step 21: setting five coordinate points of 0-4 in the outdoor air psychrometric chart according to the recommended range and the allowable range set in the step 1, wherein the point 0 is a certain point in the recommended region or on the boundary thereof; point 1 is the same temperature as point 0, and the relative humidity is the upper limit of the recommended area; point 2 is the upper limit of the recommended zone temperature and relative humidity; point 3 is the upper limit of the recommended area temperature and the upper limit of the allowable area relative humidity; 4 points are upper limits of allowable zone temperature and relative humidity;
step 22: dividing 10 regions of A1, A2, B1, B2, C, D1, D2, D3, D4 and E in the outdoor air psychrometric chart according to five coordinate points of 0-4, wherein A1 is a region surrounded by A3-point isenthalpic line, a 4-point isenthalpic line, an equal-phase relative humidity line at the upper limit of allowable range humidity and the boundary of the psychrometric chart; a2 is an area surrounded by a 2-point isenthalpic line, a 3-point isenthalpic line, a recommended range upper temperature limit and an enthalpy-humidity diagram boundary; b1 is an area enclosed by a 1-point isenthalpic line, a 2-point isenthalpic line, an equal relative humidity line of the recommended range humidity upper limit and an psychrometric chart boundary; b2 is the area enclosed by the 0 point equal enthalpy line, the 1 point equal enthalpy line, the 0 point and 1 point equal temperature line and the boundary of the psychrometric chart; c is an area enclosed by a 0-point isopenthalpic line, a 0-point isophoretic line and an enthalpy-humidity diagram boundary; d1 is a region enclosed by moisture content lines such as 4 points and the like, moisture content lines such as 3 points and the like, equal relative humidity lines of the allowable range humidity upper limit and a psychrometric chart boundary; d2 is an area enclosed by a moisture content line such as 3 points and the like, a moisture content line such as 2 points and the like, an isothermal line of the upper temperature limit of the recommended range and an enthalpy-humidity diagram boundary; d3 is a region enclosed by a moisture content line of 2 points and the like, a moisture content line of 1 point and the like, an equal relative humidity line of the recommended range humidity upper limit and an psychrometric chart boundary; d4 is a region surrounded by a moisture content line such as 1 point, a moisture content line such as 0 point, an isotherm of 0 point, and a psychrometric chart boundary.
In the above technical solution, further, the opening of the air mixing valve in step 3 is specifically controlled as follows:
in areas A1, A2, B1 and B2, the air mixing valve is closed, the air supply mode is a fresh air mode, and the air return mode is a full exhaust mode;
C. d1, D2, D3 and D4, wherein the air supply mode is a mixed air supply mode, and the air return mode is a partial discharge mode; the opening control point of the air mixing valve in the C region is 0-point enthalpy value, the opening control point of the air mixing valve in the D1 region is the upper limit of allowable range humidity, the opening control point of the air mixing valve in the D2 region is the upper limit of recommended range temperature, the opening control point of the air mixing valve in the D3 region is the upper limit of recommended range humidity, and the opening control point of the air mixing valve in the D4 region is 0-point temperature.
In the above technical solution, further, the enthalpy humidification control points in step 4 are specifically as follows:
in the area A1, the isenthalpic humidification control point is the upper limit humidity of the allowable range; in the area A2, the isenthalpic humidification control point is the upper limit temperature of the recommended range; in the area B1, the isenthalpic humidification control point is the upper limit humidity of the recommended range; in the areas B2 and C, the isenthalpic humidification control point is 0-point temperature; the isenthalpic humidification devices in the regions D1, D2, D3, D4 were turned off.
The invention has the beneficial effects that: the system can completely utilize outdoor fresh air to directly evaporate and cool the data center in certain regions, expands the completely natural cooling range, stabilizes air supply parameters, improves the cooling effect of the data center, improves the energy utilization rate, reduces the energy consumption of the data center, saves the cost, accords with the environmental protection and energy conservation concept, and reduces the environmental pressure.
Drawings
FIG. 1 is a schematic diagram of the system architecture of the present invention;
FIG. 2 is a plot of range psychrometric humidity for air conditioning system supply parameters for IT equipment;
FIG. 3 is a psychrometric chart of outdoor humiture meteorological conditions divided into different zones;
FIG. 4 is a schematic side view of the air conditioning unit installed in the machine room module;
fig. 5 is a schematic structural diagram of the air conditioning unit installed on the top surface of the machine room module.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, the system works in such a way that air processed by an air conditioning unit 20 enters a data center cold channel 2, IT equipment in an IT equipment cabinet 1 generates heat to heat the air, the IT equipment exhausts air to a hot channel 3, the air in the hot channel 3 is sucked into the unit by a return air fan 9 and passes through a return air ceiling layer 4 and a return air control valve in the process.
According to different outdoor meteorological conditions, the unit return air has two working modes, one is a partial discharge mode, and the other is a full discharge mode. In the partial exhaust mode, one part of return air is exhausted by the exhaust control valve 10, and the other part of return air enters the return air filter 11 and then is mixed with fresh air through the air mixing control valve 12; in the full exhaust mode, the return air is exhausted entirely by the exhaust control valve 10.
The rotating speed of the return air fan 9 is controlled by the pressure difference between the machine room and the outside.
According to different outdoor meteorological conditions, the unit has two air supply modes, namely a full fresh air mode and a mixed air supply mode. In a fresh air mode, outdoor fresh air enters the air conditioning unit through the fresh air control valve 6, is filtered by the fresh air filter 7 to the allowable cleanliness, passes through the isenthalpic humidifying device, and is sent into the cold channel 2 through the air duct by the air supply fan 8, and the corresponding enthalpy-humidity diagram areas are A1, A2, B1 and B2. In the mixed air supply mode, the return air and the fresh air are mixed and then enter the cold channel 2 after being processed, and the corresponding enthalpy-humidity diagram areas are C, D1, D2, D3 and D4.
After entering the unit, fresh air is first filtered to the cleanliness specified by the relevant standards of the data center.
Fresh air or mixed air of the fresh air and return air passes through the isenthalpic humidifying device, and the starting or non-starting of the isenthalpic humidifying device is determined according to different outdoor meteorological conditions. In the psychrometric chart, the device is not activated in regions D1, D2, D3, D4. At start-up, different outdoor meteorological parameters determine their different operating set points. See table 1 for details.
The isenthalpic humidifying device comprises a spraying or shower head 15, a water pump 16, a water collecting tray 17 and the like.
The control of the opening degree of the air mixing valve is one of the key points of the invention, and the opening degree is controlled by different control parameter set points according to the region where the outdoor meteorological parameters are located. See table 1 for details.
After that, the air is sent to the cold aisle 2 by the air sending fan 8. The rotating speed of the air supply fan 8 is determined by the temperature difference between the cold and hot channels 3: TEH-TEC.
For the air supply parameters of the air conditioning system of the data center aiming at the IT equipment, two ranges are defined, wherein one range is a recommended range, the other range is an allowable range, and the recommended range is smaller than or equal to the allowable range, as shown in FIG. 2.
According to different recommended ranges and allowable ranges, all outdoor temperature, humidity and weather conditions can be divided into different areas, as shown in fig. 3.
The system can divide all outdoor temperature, humidity and weather conditions into 10 areas such as A1, A2, B1, B2, C, D1, D2, D3, D4 and E, wherein B1, B2, C, D3 and D4 are areas enabling the data center to work in a recommended range, E is an area enabling the data center to work outside an allowable range, and the other areas enable the data center to work between the recommended range and the allowable range.
The complete natural cooling of the invention satisfies the following conditions based on the hour number distribution of meteorological parameters of the area where the data center is located:
the number of hours per year of the E area where the outdoor weather conditions are outside the allowable range is less than a certain value, and the number of hours per year of the a2, a1, D2, D1 areas where the outdoor weather conditions are between the recommended range and the allowable range is less than a certain value. The specific value is a certain value set by a related party.
In the psychrometric chart, the determination method of each point is as follows: point 0 is a point within the recommended area or on its boundary; point 1 is the same temperature as point 0, and humidity is the upper limit of the recommended area; point 2 is the upper limit of the temperature and humidity of the recommended area; point 3 is the upper limit of the recommended zone temperature and the upper limit of the allowable zone humidity; the upper limit of the allowable area temperature and humidity is 4 points.
The dividing method of each area comprises the following steps: a1 is a region enclosed by a 3-point isenthalpic line, a 4-point isenthalpic line, an equal relative humidity line of the upper limit of allowable range humidity and a psychrometric chart boundary; a2 is an area surrounded by a 2-point isenthalpic line, a 3-point isenthalpic line, a recommended range upper temperature limit and an enthalpy-humidity diagram boundary; b1 is an area enclosed by a 1-point isenthalpic line, a 2-point isenthalpic line, an equal relative humidity line of the recommended range humidity upper limit and an psychrometric chart boundary; b2 is the area enclosed by the 0 point equal enthalpy line, the 1 point equal enthalpy line, the 0 point and 1 point equal temperature line and the boundary of the psychrometric chart; c is an area enclosed by a 0-point isopenthalpic line, a 0-point isophoretic line and an enthalpy-humidity diagram boundary; d1 is a region enclosed by moisture content lines such as 4 points and the like, moisture content lines such as 3 points and the like, equal relative humidity lines of the allowable range humidity upper limit and a psychrometric chart boundary; d2 is an area enclosed by a moisture content line such as 3 points and the like, a moisture content line such as 2 points and the like, an isothermal line of the upper temperature limit of the recommended range and an enthalpy-humidity diagram boundary; d3 is a region enclosed by a moisture content line of 2 points and the like, a moisture content line of 1 point and the like, an equal relative humidity line of the recommended range humidity upper limit and an psychrometric chart boundary; d4 is a region surrounded by a moisture content line such as 1 point, a moisture content line such as 0 point, an isotherm of 0 point, and a psychrometric chart boundary.
Table 1.
| Region(s) | Blowing mode | Return air mode | Opening control point of air mixing valve | Isenthalpic humidification control point |
| A1 | Full fresh air mode | Full rank mode | Is free of | Upper limit humidity of allowable range |
| A2 | Full fresh air mode | Full rank mode | Is free of | Upper temperature of recommended range |
| B1 | Full fresh air mode | Full rank mode | Is free of | Humidity at upper limit of recommended range |
| B2 | Full fresh air mode | Full rank mode | Is free of | Temperature at 0 point |
| C | Mixed blowing mouldFormula (II) | Partial row mode | Enthalpy value of 0 point | Temperature at 0 point |
| D1 | Mixed blowing mode | Partial row mode | Upper limit of allowable range humidity | Is free of |
| D2 | Mixed blowing mode | Partial row mode | Upper temperature limit of recommended range | Is free of |
| D3 | Mixed blowing mode | Partial row mode | Upper humidity limit of recommended range | Is free of |
| D4 | Mixed blowing mode | Partial row mode | Temperature at 0 point | Is free of |
In addition, the system is also provided with a controller 5, a T/H temperature and humidity sensor, a temperature sensor 14 and a differential pressure sensor 13 to control the operation of the unit.
As shown in fig. 4 and 5, the air conditioning unit 20 of the present invention may be a group of a plurality of air conditioning units, which are installed on the side surface or the top surface of the machine room module 30 and connected to the machine room module 30 through the air duct 40.
Claims (10)
1. A data center complete direct evaporation natural cooling system is characterized in that: the system comprises an air conditioning unit (20) and a machine room module (30), wherein the air conditioning unit and the machine room module are connected through an air pipe (40); the air conditioning unit comprises an air supply part and an air return part; the machine room module comprises an IT equipment cabinet (1), a cold channel (2), a hot channel (3) and a suspended ceiling air return layer (4); outdoor fresh air firstly enters a cold channel through an air supply part of the air conditioning unit, IT equipment in an IT equipment cabinet generates heat to heat air, the IT equipment exhausts the air to a hot channel, and the air in the hot channel is totally or partially removed and partially mixed with the fresh air of the air supply part after entering the air return part of the air conditioning unit through a ceiling return air layer; the system further comprises a controller (5), the controller (5) is in communication connection with the air conditioning unit and the machine room module, and the operation of the system is controlled.
2. The system of claim 1, wherein the system comprises: according to the air path, the air supply part sequentially comprises a fresh air control valve (6), a fresh air filter (7), an isenthalpic humidifying device and an air supply fan (8); outdoor fresh air enters an air conditioning unit through a fresh air control valve (6), is filtered by a fresh air filter (7), passes through an isenthalpic humidifying device, and is sent into a machine room module (30) through an air duct by an air supply fan (8);
according to the air path, the air return part sequentially comprises an air return fan (9), an exhaust control valve (10), an air return filter (11) and an air mixing control valve (12); air in a hot channel of the machine room module is sucked into the machine set by a return air fan (9), one part of return air is discharged by an exhaust control valve (10), the other part of return air enters a return air filter (11), and then is mixed with fresh air by a mixed air control valve (12); or the return air is completely discharged by the air exhaust control valve (10);
the fresh air control valve (6), the isenthalpic humidifying device, the air supply fan (8), the return air fan (9), the exhaust control valve (10) and the air mixing control valve (12) are in communication connection with the controller (5) and controlled to work by the controller.
3. The system of claim 2, wherein the system comprises: a pressure difference sensor (13) is arranged at the air return part in the air conditioning unit and the outside of the air conditioning unit, and is in communication connection with a controller (5) to control the rotating speed of the air return fan through the internal and external pressure difference;
the machine room module is characterized in that the cold channel and the hot channel are respectively provided with a temperature sensor (14) and are in communication connection with a controller (5), and the rotating speed of the air feeder is controlled through the temperature difference between the cold channel and the hot channel.
4. The system of claim 2, wherein the system comprises: the air conditioning unit is provided with at least 4 temperature and humidity sensors, and the temperature and humidity sensors are respectively arranged in front of the fresh air control valve, in front of the isenthalpic humidifying device, in front of the air supply fan and behind the air return fan according to an air path and are in communication connection with the controller for collecting the temperature and humidity values of indoor and outdoor air of the air conditioning unit.
5. The system of claim 2, wherein the system comprises: the isenthalpic humidifying device is composed of a spraying or shower head (15), a variable-frequency water pump (16) and a water collecting tray (17), and the variable-frequency water pump (16) is in communication connection with the controller (5).
6. The system of claim 1, wherein the system comprises:
the air conditioning unit can be a plurality of and be a set of, installs in computer lab module side or top surface, all is connected with the computer lab module through the tuber pipe.
7. A control method of a data center complete direct evaporation natural cooling system is characterized in that: comprises the following steps:
step 1: aiming at air supply parameters of the air conditioning unit, two ranges are defined, wherein one range is a recommended range, the other range is an allowable range, and the recommended range is smaller than or equal to the allowable range; the recommended range and the allowable range are defined by setting temperature and humidity values;
step 2: according to different recommended ranges and allowed ranges, all outdoor temperature, humidity and weather conditions are divided into 10 areas A1, A2, B1, B2, C, D1, D2, D3, D4 and E, wherein the 10 areas A1, B2, C, D3 and D4 are areas enabling the data center to work in the recommended ranges, the areas E enabling the data center to work out of the allowed ranges, and the other areas enabling the data center to work between the recommended ranges and the allowed ranges;
and step 3: controlling the opening of the air mixing valve by different control parameter set points according to the area where the outdoor meteorological parameters are located;
and 4, step 4: according to the area where the outdoor meteorological parameters are located, when fresh air or mixed air of the fresh air and return air passes through the isenthalpic humidifying device, the isenthalpic humidifying control point is controlled.
8. The method for controlling a complete direct evaporative free cooling system of a data center as claimed in claim 7, wherein: the step 2 specifically comprises the following steps:
step 21: setting five coordinate points of 0-4 in the outdoor air psychrometric chart according to the recommended range and the allowable range set in the step 1, wherein the point 0 is a certain point in the recommended region or on the boundary thereof; point 1 is the same temperature as point 0, and the relative humidity is the upper limit of the recommended area; point 2 is the upper limit of the recommended zone temperature and relative humidity; point 3 is the upper limit of the recommended area temperature and the upper limit of the allowable area relative humidity; 4 points are upper limits of allowable zone temperature and relative humidity;
step 22: dividing 10 regions of A1, A2, B1, B2, C, D1, D2, D3, D4 and E in the outdoor air psychrometric chart according to five coordinate points of 0-4, wherein A1 is a region surrounded by A3-point isenthalpic line, a 4-point isenthalpic line, an equal-phase relative humidity line at the upper limit of allowable range humidity and the boundary of the psychrometric chart; a2 is an area surrounded by a 2-point isenthalpic line, a 3-point isenthalpic line, a recommended range upper temperature limit and an enthalpy-humidity diagram boundary; b1 is an area enclosed by a 1-point isenthalpic line, a 2-point isenthalpic line, an equal relative humidity line of the recommended range humidity upper limit and an psychrometric chart boundary; b2 is the area enclosed by the 0 point equal enthalpy line, the 1 point equal enthalpy line, the 0 point and 1 point equal temperature line and the boundary of the psychrometric chart; c is an area enclosed by a 0-point isopenthalpic line, a 0-point isophoretic line and an enthalpy-humidity diagram boundary; d1 is a region enclosed by moisture content lines such as 4 points and the like, moisture content lines such as 3 points and the like, equal relative humidity lines of the allowable range humidity upper limit and a psychrometric chart boundary; d2 is an area enclosed by a moisture content line such as 3 points and the like, a moisture content line such as 2 points and the like, an isothermal line of the upper temperature limit of the recommended range and an enthalpy-humidity diagram boundary; d3 is a region enclosed by a moisture content line of 2 points and the like, a moisture content line of 1 point and the like, an equal relative humidity line of the recommended range humidity upper limit and an psychrometric chart boundary; d4 is a region surrounded by a moisture content line such as 1 point, a moisture content line such as 0 point, an isotherm of 0 point, and a psychrometric chart boundary.
9. The method for controlling a complete direct evaporative free cooling system of a data center as claimed in claim 7, wherein: the opening degree control of the air mixing valve in the step 3 is specifically as follows:
in areas A1, A2, B1 and B2, the air mixing valve is closed, the air supply mode is a fresh air mode, and the air return mode is a full exhaust mode;
C. d1, D2, D3 and D4, wherein the air supply mode is a mixed air supply mode, and the air return mode is a partial discharge mode; the opening control point of the air mixing valve in the C region is 0-point enthalpy value, the opening control point of the air mixing valve in the D1 region is the upper limit of allowable range humidity, the opening control point of the air mixing valve in the D2 region is the upper limit of recommended range temperature, the opening control point of the air mixing valve in the D3 region is the upper limit of recommended range humidity, and the opening control point of the air mixing valve in the D4 region is 0-point temperature.
10. The method for controlling a complete direct evaporative free cooling system of a data center as claimed in claim 7, wherein: the enthalpy-in-water humidification control point in the step 4 is specifically as follows:
in the area A1, the isenthalpic humidification control point is the upper limit humidity of the allowable range; in the area A2, the isenthalpic humidification control point is the upper limit temperature of the recommended range; in the area B1, the isenthalpic humidification control point is the upper limit humidity of the recommended range; in the areas B2 and C, the isenthalpic humidification control point is 0-point temperature; the isenthalpic humidification devices in the regions D1, D2, D3, D4 were turned off.
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| CN202010518375.2A CN112118706A (en) | 2020-06-09 | 2020-06-09 | Data center complete direct evaporation natural cooling system and control method thereof |
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| CN113899039A (en) * | 2021-10-22 | 2022-01-07 | 广东美的暖通设备有限公司 | Air conditioning device, control method, electronic equipment and storage medium |
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| CN113899039A (en) * | 2021-10-22 | 2022-01-07 | 广东美的暖通设备有限公司 | Air conditioning device, control method, electronic equipment and storage medium |
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