Indirect evaporative air conditioning control system and control method

Abstract

The application provides an indirect evaporative air conditioner control system and control method, comprising the following steps: obtaining an inner circulation return air temperature, comparing the inner circulation return air temperature with an inner circulation return air temperature set value, and adjusting an inner circulation fan; obtaining an inner circulation supply air temperature, comparing the inner circulation supply air temperature with an inner circulation supply air temperature set value, and adjusting a cold water heat exchanger water inlet valve; obtaining the inner circulation return air temperature and an outer circulation wet curtain inlet air temperature, comparing a difference between the inner circulation return air temperature and the outer circulation wet curtain inlet air temperature with a temperature difference set value, and adjusting an outer circulation fan or the inner circulation fan. The application has the beneficial effect of solving the problem that an indirect evaporative cooling air conditioner device is large in size, can only be placed on a building side or a building top in a data center, and is limited in use conditions, improving heat exchange efficiency, and reducing energy consumption.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of data center cooling, and particularly relates to an indirect evaporative air conditioner control system and a control method. BACKGROUND

[0002] With the proposal of new infrastructure, the domestic Internet, intelligentization, cloud computing, big data storage and other industries have developed rapidly, and operators and Internet companies have built a large number of data centers. A large number of electronic equipment is installed in the data center, and a large amount of heat is generated when the electronic equipment is running, which increases the temperature in the data center. In order to dissipate heat from the electronic equipment and meet the requirements of the working environment, the data center is provided with refrigeration equipment to dissipate heat from the electronic equipment.

[0003] The existing refrigeration equipment is generally a refrigeration air conditioning system, which realizes the heat dissipation and cooling of the electronic equipment. However, the energy consumption of the refrigeration air conditioning system is relatively high, accounting for about 45% of the total energy consumption of the data center.

[0004] At present, with the increasing emphasis of the state on energy saving and emission reduction, the data center has some feasible schemes in energy saving and emission reduction. These schemes generally use indirect evaporative air conditioning systems or direct evaporative air conditioning systems for cooling. The indirect evaporative air conditioning system or the direct evaporative air conditioning system utilizes natural cold sources to cool outdoor air and discharges low-temperature air to the indoor side to achieve the effect of refrigeration and cooling, thereby reducing the working time of the refrigeration host and the power consumption of the refrigeration air conditioning system.

[0005] Indirect evaporative cooling technology is a high-efficiency data center refrigeration solution. It utilizes the characteristic that the air wet bulb temperature is lower than the dry bulb temperature to evaporatively cool the outdoor air to approach the wet bulb temperature, and exchanges heat with the indoor air through a heat exchanger to obtain the required indoor air supply temperature, thereby improving the heat exchange efficiency, prolonging the natural cooling time and reducing the energy consumption of the data center.

[0006] The working conditions of the indirect evaporative cooling refrigeration unit generally include dry working condition, wet working condition, auxiliary cold source working condition and other operating conditions. The dry working condition refers to the working state without water spraying on the surface of the heat exchanger. The wet working condition refers to the working state of the indirect evaporative cooling unit in which external water supply is introduced and water is sprayed on the surface of the heat exchanger through a spraying device to realize evaporative cooling. When the indirect evaporative cooling refrigeration unit operates in the wet working condition, the refrigeration effect of the indirect evaporative cooling unit depends on the external water supply.

[0007] The direct evaporative cooling air conditioning system refers to the effect of cooling and refrigeration by discharging the outdoor air after evaporation to the indoor. However, because the refrigeration effect depends on the humidity, temperature and air cleanliness of the geographical environment of the data center, if any of the humidity, temperature and cleanliness does not meet the use requirements, a large amount of personnel and power is needed to meet the use requirements, so the use of the direct evaporative cooling air conditioning system is relatively small, and the use environment is relatively harsh.

[0008] Compared with the direct evaporative cooling air conditioning system, the indirect evaporative cooling air conditioning system can greatly avoid the influence of the above factors. When the indirect evaporative cooling air conditioning system is used alone, it can only be placed on the side or top of the building of the data center, that is, it can only meet the use of the data center with a maximum of 2 layers. When the indirect evaporative cooling air conditioning system is mixed with the original refrigeration air conditioner, the physical and logical connection between the two is small. In addition, the existing indirect evaporative cooling air conditioning system has a short utilization time of natural cold source and produces a small amount of cold, and the refrigeration air conditioner still works for a long time, resulting in a large amount of power consumption of the refrigeration air conditioner, which is not conducive to improving the energy saving effect.

[0009] How to solve the problem that the indirect evaporative cooling air conditioning system can only be used on the side or top of the building, break through the limitation of being used in the data center with a maximum of 2 layers, and form a unified logical control between the indirect evaporative cooling air conditioning system and the original air conditioning system in logic, so as to maximize the use of natural cold source to reduce the indoor temperature to meet the requirements of the data center specification, is a problem to be solved by the person skilled in the art. SUMMARY

[0010] In view of the above problems, the present application provides an indirect evaporative air conditioning control system and a control method to solve the above or other problems existing in the prior art.

[0011] To solve the above technical problems, the technical scheme adopted by the present application is: an indirect evaporative air conditioning control method, comprising the following steps,

[0012] obtaining the inner circulation return air temperature and comparing the inner circulation return air temperature with the inner circulation return air temperature set value to adjust the inner circulation fan;

[0013] obtaining the inner circulation supply air temperature and comparing the inner circulation supply air temperature with the inner circulation supply air temperature set value to adjust the water valve of the cold water heat exchanger;

[0014] obtaining the inner circulation return air temperature and the outer circulation wet curtain inlet air temperature, and comparing the difference between the inner circulation return air temperature and the outer circulation wet curtain inlet air temperature with the temperature difference set value to adjust the outer circulation fan or the inner circulation fan.

[0015] Further, it is judged whether the inner circulation return air temperature is greater than the inner circulation return air temperature set value, if yes, the speed of the inner circulation air blower is increased;

[0016] Otherwise, the speed of the inner circulation air blower is decreased or the inner circulation air blower is decreased to the minimum output.

[0017] Further, it is judged whether the inner circulation supply air temperature is greater than the inner circulation supply air temperature set value, if yes, the water valve of the cold water heat exchanger is opened;

[0018] Otherwise, the water valve of the cold water heat exchanger is closed or the water valve of the cold water heat exchanger is closed to the minimum output.

[0019] Further, it is judged whether the difference between the inner circulation return air temperature and the outer circulation wet curtain inlet air temperature is greater than the temperature difference set value, if no, the outer circulation air blower is closed or the outer circulation air blower is adjusted to the minimum output.

[0020] Further, if the difference between the inner circulation return air temperature and the outer circulation wet curtain inlet air temperature is greater than the temperature difference set value, the temperature after the outer circulation wet curtain pre-cooling is obtained, it is judged whether the temperature after the outer circulation wet curtain pre-cooling is greater than the set value of the temperature after the outer circulation wet curtain pre-cooling, if no, the speed of the outer circulation air blower is decreased.

[0021] Further, if the temperature after the outer circulation wet curtain pre-cooling is greater than the set value of the temperature after the outer circulation wet curtain pre-cooling, it is judged whether the outer circulation air blower reaches the maximum set value or the minimum one of k times of the inner output value, if no, the speed of the inner circulation air blower is increased, otherwise, the inner circulation return air temperature and the outer circulation wet curtain inlet air temperature are continuously obtained, wherein k is 0-2.

[0022] An indirect evaporative air conditioning control system, comprising an outer circulation wet curtain inlet air temperature measuring device, an outer circulation wet curtain outlet air temperature measuring device, an outer circulation air blower, an inner circulation air blower, an inner circulation supply air temperature measuring device and an inner circulation return air temperature measuring device, wherein,

[0023] The outer circulation wet curtain inlet air temperature measuring device is arranged at the inlet air end of the wet curtain and is used for measuring the temperature of the air at the inlet air end of the wet curtain;

[0024] The outer circulation wet curtain outlet air temperature measuring device is arranged at the outlet air end of the wet curtain and is used for measuring the temperature of the air at the outlet air end of the wet curtain;

[0025] The outer circulation air blower is arranged in the outer circulation outlet air duct and is used for controlling the air flow in the outer circulation passage;

[0026] The inner circulation supply air temperature measuring device is arranged in the inner circulation supply air passage and is used for measuring the air temperature in the inner circulation supply air passage;

[0027] The inner circulation return air temperature measuring device is arranged in the inner circulation return air passage and is used for measuring the air temperature in the inner circulation return air passage.

[0028] The inner circulation fan is arranged at the air supply end of the air conditioning cooling system and is used for controlling the air flow in the inner circulation air supply passage and the inner circulation return air passage.

[0029] Further, the outer circulation passage and the inner circulation return air passage are provided with a heat conduction layer, so that the air in the outer circulation passage cooled by the wet curtain cools the air in the inner circulation return air passage.

[0030] Further, the inner circulation return air passage is communicated with the air inlet end of the air conditioning cooling system, the inner circulation air supply passage is communicated with the air outlet end of the air conditioning cooling system, the air in the inner circulation return air passage is cooled by the air cooled by the wet curtain and then cooled by the air conditioning cooling system and then enters the inner circulation air supply passage to circulate.

[0031] Further, the air conditioning cooling system comprises a cold water heat exchanger, and the cooling liquid outlet end of the cooling heat exchanger is provided with a water valve.

[0032] Further, the inner circulation return air passage is arranged at the top or side of the server cabinet, the inner circulation air supply passage is arranged at the bottom or side of the server cabinet, and the wet curtain is arranged at one side of the server cabinet.

[0033] Further, the indirect evaporative air conditioner control system further comprises a control device, the control device is electrically connected with the outer circulation wet curtain air inlet temperature measuring device, the outer circulation wet curtain air outlet temperature measuring device, the outer circulation fan, the inner circulation fan, the inner circulation air supply temperature measuring device, the inner circulation return air temperature measuring device and the water valve, and the outer circulation fan, the inner circulation fan and the water valve are controlled to act according to the measurement results of the control device and the outer circulation wet curtain air inlet temperature measuring device, the outer circulation wet curtain air outlet temperature measuring device, the inner circulation air supply temperature measuring device and the inner circulation return air temperature measuring device.

[0034] With the above technical scheme, the inner air circulation and the outer air circulation are adopted to cool the hot air around the electronic equipment of the data center twice, the inner air circulation has an inner circulation air supply channel and an inner circulation return air channel, the inner circulation air supply channel is located at the bottom or the side of the server cabinet, the inner circulation return air channel is located at the top or the side of the server cabinet, the inner circulation air supply channel is connected with the air outlet end of the air conditioning cooling system, and an inner circulation fan is arranged at the air outlet end of the air conditioning cooling system, the inner circulation return air channel is connected with the air inlet end of the air conditioning cooling system, the outer circulation channel is arranged at one side of the server cabinet, the inner circulation channel and the outer circulation channel are not connected and independently perform air cooling circulation, and the inner circulation channel and the outer circulation channel are separated by a heat conduction layer, so that the cold air of the outer circulation channel can exchange heat with the hot air in the inner circulation channel and be cooled, thereby solving the problem that the indirect evaporative cooling air conditioning equipment is large in size, the use scene can only be placed at the side or the top of the building used by the data center, and the use condition is limited; temperature sensors are arranged at the air inlet end of the inner circulation air supply channel and the air outlet end of the inner circulation return air channel, the air inlet end and the air outlet end of the wet curtain of the outer circulation channel, and each temperature sensor is connected with the control device, the control device compares the temperature values measured by each temperature sensor with preset values, controls the actions of the inner circulation fan, the outer circulation fan and the water valve at the outlet end of the cooling liquid of the cold water heat exchanger according to the comparison result, mixes the indirect evaporative cooling system and the traditional precision air conditioner, solves the problem that the logic is contradictory or the instruction source is not unified in the actual use process, causes the mechanical refrigeration air conditioner to still work for a long time, and wastes electric energy, the natural cold source is used to the maximum extent to reduce the indoor temperature to meet the data center specification requirements, the heat exchange efficiency is improved, the natural cooling time is prolonged, and the energy consumption of the data center is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a structure schematic diagram of an indirect evaporative air conditioner control system of an embodiment of the present application;

[0036] Figure 2 is a structure schematic diagram of a control module of an indirect evaporative air conditioner control system of an embodiment of the present application;

[0037] Figure 3 is a logic flow diagram of an indirect evaporative air conditioner control method of an embodiment of the present application;

[0038] Figure 4 is a logic flow diagram of an indirect evaporative air conditioner control method of an embodiment of the present application, in which an outer circulation fan pre-cools an outer circulation wet curtain and a temperature sensor controls the logic flow;

[0039] Figure 5 is a logic flow diagram of an indirect evaporative air conditioner control method of an embodiment of the present application, in which an inner circulation fan control is an inner circulation return air temperature sensor control logic flow;

[0040] Figure 6 The water inlet valve (analog quantity) of the indirect evaporative air conditioner control method of an embodiment of the present application is a logical flow chart of the inner circulation air supply control;

[0041] In the formula, set value 1 is the inner circulation return air temperature set value, set value 2 is the inner circulation air supply temperature set value, set value 3 is the set value of the difference between the inner circulation return air temperature and the outer circulation wet curtain inlet air temperature, and set value 4 is the outer circulation wet curtain outlet air temperature set value.

[0042] In the figure:

[0043] 1, outer circulation wet curtain inlet air temperature measuring device 2, wet curtain 3, outer circulation wet curtain outlet air temperature measuring device

[0044] Measuring device

[0045] 4, outer circulation air fan 5, outer circulation air outlet duct 6, inner circulation return air temperature measuring device

[0046] Measuring device

[0047] 7, air conditioning cooling system 8, inner circulation air fan 9, inner circulation air supply temperature measuring device

[0048] Measuring device DETAILED DESCRIPTION

[0049] The present application will be further described below in conjunction with the drawings and specific embodiments.

[0050] Figure 1 The structure schematic diagram of an embodiment of the present application is shown, the embodiment relates to an indirect evaporative air conditioner control system and control method, which is used for heat dissipation of a data center, has outer air circulation and inner air circulation, carries out two-step cooling on hot air generated by a server cabinet, and the inner air circulation flows in an inner circulation air supply channel and an inner circulation return air channel, the inner circulation air supply channel and the inner circulation return air channel are respectively arranged at the bottom and the top of the server cabinet, and the outer air circulation is arranged at one side of the server cabinet, thereby solving the problem that because the volume of the indirect evaporative cooling air conditioner device is large, the use scene can only be placed at the side or the top of the building used by the data center, and the use conditions are limited to a certain extent; temperature measuring devices are arranged in the outer air circulation channel, the inner circulation air supply channel and the inner circulation return air channel, each temperature measuring device obtains the temperature of each position, and transmits the measurement result to a control device, the control device controls the action of each device of the indirect evaporative air conditioner control system, solves the problem that the indirect evaporative cooling system and the traditional precision air conditioner are mixed, the logic exists contradiction or the instruction source is not unified in the use process, and the mechanical refrigeration air conditioner is still in long-time work, thereby wasting electric energy.

[0051] An indirect evaporative air conditioner control system, such as Figure 1and 2 As shown, the system comprises an outer circulation wet curtain air inlet temperature measuring device 1, an outer circulation wet curtain air outlet temperature measuring device 3, an outer circulation fan 4, an inner circulation fan 8, an inner circulation air supply temperature measuring device 9, and an inner circulation return air temperature measuring device 6. The outer circulation wet curtain air inlet temperature measuring device 1 is arranged at the air inlet end of the wet curtain 2 and is used to measure the temperature of the air at the air inlet end of the wet curtain 2. The air at the air inlet end of the wet curtain 2 is cold air from outside the data center. The outer circulation wet curtain air outlet temperature measuring device 3 is arranged at the air outlet end of the wet curtain 2 and is used to measure the temperature of the air at the air outlet end of the wet curtain 2. The air is cooled when passing through the wet curtain 2. The outer circulation fan 4 is arranged in the outer circulation air outlet duct 5 and is used to realize the flow of air in the outer circulation passage. The inner circulation air supply temperature measuring device 9 is arranged in the inner circulation air supply passage and is used to measure the temperature of the air in the inner circulation air supply passage. The inner circulation return air temperature measuring device 6 is arranged in the inner circulation return air passage and is used to measure the temperature of the air in the inner circulation return air passage. The inner circulation fan 8 is arranged at the air supply end of the air conditioning cooling system 7 and is used to realize the flow of air in the inner circulation air supply passage and the inner circulation return air passage.

[0052] The cold air from outside enters the wet curtain air duct from the air inlet end of the wet curtain 2, is cooled by the wet curtain heat exchanger, and then moves into the outer circulation air outlet duct 5 under the action of the outer circulation fan 4. In the process of movement, the air exchanges heat with the hot air in the inner circulation return air passage, cools the hot air in the inner circulation return air passage, and is heated by the hot air in the inner circulation return air passage at the same time. Then, the air is discharged from the outer circulation air outlet duct 5 by the outer circulation fan 4, which is the outer air circulation. The hot air generated by the server cabinet enters the air duct of the air conditioning cooling system 7 from the inner circulation return air passage, is cooled by the cold air from outside on the wet curtain heat exchanger, and is cooled again by the cold water heat exchanger of the air conditioning cooling system 7. Then, the air enters the inner circulation air supply passage from the air outlet end of the air duct of the air conditioning cooling system 7 by the inner circulation fan 8, is discharged after being cooled twice, and cools the server cabinet, which is the inner air circulation. Through the inner air circulation and the outer air circulation, the cold air from outside and the hot air near the server cabinet are exchanged and cooled, and are cooled again by the air conditioning cooling system 7, so as to realize the cooling of the electronic equipment in the data center.

[0053] The outer circulation channel is not communicated with the inner circulation return air channel, and a heat conduction layer is arranged between the outer circulation channel and the inner circulation return air channel, so that the air cooled by the wet curtain 2 in the outer circulation channel can cool the air in the inner circulation return air channel. The air inlet end of the outer circulation air outlet 5 of the outer circulation channel is spaced from the air outlet end of the inner circulation return air channel by the heat conduction layer. When the outer circulation channel and the inner circulation channel are separate channels, the air cooled by the wet curtain 2 can cool and lower the temperature of the hot air flowing out of the inner circulation return air channel, and the hot air is cooled for the first time. The wet curtain 2 includes a wet curtain heat exchanger, which exchanges heat with external cold air, cools and lowers the temperature of the external cold air. The wet curtain 2 is a commercially available product, which is selected according to actual needs, and no specific requirements are made here. The wet curtain 2 is arranged at the air inlet end of the outer circulation channel to cool the external cold air.

[0054] The inner circulation return air channel is communicated with the air inlet end of the air conditioning cooling system 7, and the inner circulation air supply channel is communicated with the air outlet end of the air conditioning cooling system 7. The air flowing out of the inner circulation air supply channel cools the server cabinet, then enters the inner circulation return air channel, and then enters the air duct of the air conditioning cooling system 7 from the inner circulation return air channel. The air in the inner circulation return air channel is cooled by the air cooled by the wet curtain 2, and then cooled by the air conditioning cooling system 7, and then enters the inner circulation air supply channel to circulate, realizing the circulation of the inner air.

[0055] The air conditioning cooling system 7 includes a cold water heat exchanger, and a water valve is arranged at the cooling liquid outlet end of the cold water heat exchanger. The cold water heat exchanger is used to cool the hot air flowing out of the inner circulation return air channel, has a cooling liquid inlet and a cooling liquid outlet, and the cooling liquid inlet and the cooling liquid outlet are respectively connected with the cold water heat exchanger body. The cooling liquid flows into the cold water heat exchanger body from the cooling liquid inlet, and flows out from the cooling liquid outlet. The cooling liquid exchanges heat with the hot air during the flow process to cool the hot air. The water valve is arranged at the cooling liquid outlet end, and can adjust the flow of the cooling liquid flowing out of the cooling liquid outlet end. The cold water heat exchanger is a commercially available product, which is selected according to actual needs, and no specific requirements are made here. In this embodiment, the water valve is preferably a two-way proportional integral valve.

[0056] The inner air circulates in the inner circulation air supply channel, the inner circulation return air channel and the air duct of the air conditioning cooling system 7 under the action of the inner circulation fan 8, and the outer air circulates in the outer circulation channel under the action of the outer circulation fan 4, wherein, in view of the structure of the wet curtain 2, the wet curtain 2 is arranged on one side of the server cabinet, that is, the wet curtain 2 is located on any side of the building used by the data center, the outer circulation channel extends from one side of the building used by the data center to the top of the building, and extends from the side or the top to communicate with the outside, forming the outer circulation channel, the wet curtain 2 structure is arranged at the air inlet end of the outer circulation channel, and the outer circulation fan 4 is arranged in the outer circulation air outlet duct 5, so that the circulation flow of the cold air entering, being cooled, exchanging heat with hot air and flowing out is realized under the action of the outer circulation fan 4, and the outdoor cold source refrigeration is fully utilized; the air conditioning cooling system 7 is installed in the building used by the data center, the air inlet end of the air duct of the air conditioning cooling system 7 is arranged to face the top end of the building used by the data center, the air outlet end is arranged to face the direction of the server cabinet, the inner circulation return air channel is arranged at the top or side of the server cabinet, the inner circulation air supply channel is arranged at the bottom or side of the server cabinet, the inner circulation return air channel communicates with the air inlet end of the air duct of the air conditioning cooling system 7, the inner circulation air supply channel communicates with the air outlet end of the air duct of the air conditioning cooling system 7, the air flowing out from the inner circulation air supply channel enters the space where the server cabinet is located, cools the server cabinet, and then enters the inner circulation return air channel, and the inner circulation fan 8 is located at the air outlet end of the air duct of the air conditioning cooling system 7, so that the air flow is realized under the action of the inner circulation fan 8.

[0057] In the case of reforming the data center of a multi-storey building or an old data center, the indirect evaporative air conditioning control system can greatly reduce the original air conditioning energy consumption, fully utilize the outdoor cold source refrigeration, and solve the problem that the indirect evaporative cooling air conditioning equipment is large in size, can only be placed on the side or top of the building used by the data center, and is limited in use.

[0058] The outer circulation wet curtain air inlet temperature measuring device 1, the outer circulation wet curtain air outlet temperature measuring device 3, the inner circulation air supply temperature measuring device 9 and the inner circulation return air temperature measuring device 6 are all temperature sensors, which are commercially available products and are selected according to actual needs, and no specific requirements are made here.

[0059] The outer circulation fan 4 and the inner circulation fan 8 are commercially available products, which are selected according to actual needs, and no specific requirements are made here.

[0060] The indirect evaporative air conditioning control system further comprises a control device electrically connected with the outdoor circulating wet curtain inlet air temperature measuring device 1, the outdoor circulating wet curtain outlet air temperature measuring device 3, the indoor circulating air supply temperature measuring device 9, the indoor circulating return air temperature measuring device 6, the outdoor circulating fan 4, the indoor circulating fan 8 and the water valve at the outlet end of the cooling liquid of the cold water heat exchanger, receives the temperature measurement results of the outdoor circulating wet curtain inlet air temperature measuring device 1, the outdoor circulating wet curtain outlet air temperature measuring device 3, the indoor circulating air supply temperature measuring device 9 and the indoor circulating return air temperature measuring device 6, and has preset values and control programs of the respective temperatures in the control device, compares the measurement values with the preset values, controls the operation of the outdoor circulating fan 4, the indoor circulating fan 8 or the water valve at the outlet end of the cooling liquid of the cold water heat exchanger according to the comparison results, and controls the temperature of the air near the server cabinet. The indirect evaporative cooling system and the traditional precision air conditioner are mixed to solve the problem that the logical contradiction exists in the use process or the instruction source is not unified, so that the mechanical refrigeration air conditioner still works for a long time and the electric energy is wasted. In the case of fully cooling the electronic equipment of the data center, the electric energy is saved, the energy consumption is reduced, the natural cold source is used to the maximum extent to reduce the indoor temperature to meet the data center specification requirements, and the energy saving effect is improved.

[0061] An indirect evaporative air conditioning control method, as shown in the figure, controls the operation of the above-mentioned indirect evaporative air conditioning control system to cool the electronic equipment of the data center, comprising the following steps, Figures 3-6

[0062] The indoor circulating return air temperature is obtained, and the indoor circulating return air temperature is compared with the indoor circulating return air temperature set value to adjust the indoor circulating fan 8; specifically,

[0063] If the indoor circulating return air temperature is greater than the indoor circulating return air temperature set value, at this time, the indoor circulating return air temperature is too high, the rotating speed of the indoor circulating fan 8 is increased, the air flow speed is increased, more air can be cooled at the same time, and the cooling of the indoor circulating return air is accelerated;

[0064] Otherwise, the rotating speed of the indoor circulating fan 8 is reduced or the indoor circulating fan 8 is reduced to the minimum output, at this time, the indoor circulating return air temperature is not high, in order to avoid energy waste, the rotating speed of the indoor circulating fan 8 is reduced, or the rotating speed of the indoor circulating fan 8 is adjusted to the minimum output, which can meet the cooling demand.

[0065] The indoor circulating air supply temperature is obtained, and the indoor circulating air supply temperature is compared with the indoor circulating air supply temperature set value to adjust the water valve of the cold water heat exchanger; specifically,

[0066] ​If the inner circulation air supply temperature is greater than the inner circulation air supply temperature set value, at this time, the inner circulation air supply temperature is too high, and the electronic equipment in the data center cannot be cooled well, so the water valve of the cold water heat exchanger is opened, and the air in the inner circulation air supply passage is rapidly cooled to reduce the inner circulation air supply temperature, so that the electronic equipment in the data center can be cooled better.

[0067] Otherwise, the inner circulation air supply temperature is not high, in order to avoid energy waste, the water valve of the cold water heat exchanger is closed or the cold water heat exchanger is closed to the minimum output, and the air in the inner circulation air supply is cooled by using a small flow of cooling liquid, which can meet the use requirement of the inner circulation air supply temperature.

[0068] The inner circulation return air temperature and the outer circulation wet curtain inlet air temperature are obtained, and the difference between the inner circulation return air temperature and the outer circulation wet curtain inlet air temperature is compared with the temperature difference set value, and the outer circulation fan 4 or the inner circulation fan 8 is adjusted, specifically,

[0069] If the difference between the inner circulation return air temperature and the outer circulation wet curtain inlet air temperature is less than the temperature difference set value, at this time, the difference between the inner circulation return air temperature and the outer circulation wet curtain inlet air temperature is small, and the outer circulation fan 4 is closed or adjusted to the minimum output, and the temperature of the cooled air can meet the use requirement.

[0070] If the difference between the inner circulation return air temperature and the outer circulation wet curtain inlet air temperature is greater than the temperature difference set value, at this time, the difference between the inner circulation return air temperature and the outer circulation wet curtain inlet air temperature is greater, and the temperature of the outer circulation wet curtain after pre-cooling is obtained, and it is judged whether the temperature of the outer circulation wet curtain after pre-cooling is greater than the set value of the temperature of the outer circulation wet curtain after pre-cooling, if not, at this time, the temperature of the outer circulation wet curtain after pre-cooling is low, and the use requirement is met, and the speed of the outer circulation fan 4 is reduced, and the outer circulation fan 4 uses a smaller speed to meet the requirement of cooling the hot air flowing out of the inner circulation return air passage by the air after pre-cooling of the outer circulation wet curtain, thereby reducing energy consumption.

[0071] If the temperature of the outer circulation wet curtain after pre-cooling is greater than the set value of the temperature of the outer circulation wet curtain after pre-cooling, at this time, the temperature of the outer circulation wet curtain after pre-cooling is higher, and it is judged whether the outer circulation fan 4 reaches the maximum set value or the minimum one of k times the inner output value, if not, at this time, the speed of the inner circulation fan 8 is smaller, and the speed of the inner circulation fan 8 is increased, otherwise, the speed of the inner circulation fan 8 is kept, and the inner circulation return air temperature and the outer circulation wet curtain inlet air temperature are continuously obtained, and the above steps are repeated. Wherein, k is 0-2.

[0072] The inner circulation return air temperature set value, the inner circulation air supply temperature set value, the set value of the temperature of the outer circulation wet curtain after pre-cooling, and the set value of the difference between the inner circulation return air temperature and the outer circulation wet curtain inlet air temperature are selected and set according to actual requirements, and specific requirements are not made here.

[0073] Due to the above technical scheme, the inner air circulation and the outer air circulation are adopted to cool the hot air around the electronic equipment of the data center twice, the inner air circulation has an inner circulation air supply channel and an inner circulation return air channel, the inner circulation air supply channel is located at the bottom or the side of the server cabinet, the inner circulation return air channel is arranged at the top or the side of the server cabinet, the inner circulation air supply channel is connected with the air outlet end of the air conditioning cooling system, and an inner circulation fan is arranged at the air outlet end of the air conditioning cooling system, the inner circulation return air channel is connected with the air inlet end of the air conditioning cooling system, the outer circulation channel is arranged at one side of the server cabinet, the inner circulation channel and the outer circulation channel are not connected and independently perform air cooling circulation, and the inner circulation channel and the outer circulation channel are separated by a heat conduction layer, so that the cold air of the outer circulation channel can exchange heat with the hot air in the inner circulation channel to cool the hot air, solve the problem that the indirect evaporative cooling air conditioning equipment is large in size, the use scene can only be placed at the side or the top of the building used by the data center, and the use conditions are limited; temperature sensors are arranged at the air inlet end of the inner circulation air supply channel and the air outlet end of the inner circulation return air channel, the air inlet end and the air outlet end of the wet curtain of the outer circulation channel, and each temperature sensor is connected with the control device, the control device compares the temperature values measured by each temperature sensor with the preset values, controls the actions of the inner circulation fan, the outer circulation fan and the water valve at the outlet end of the cooling liquid of the cold water heat exchanger according to the comparison results, mixes the indirect evaporative cooling system and the traditional precision air conditioner, solves the problem that the logical contradiction exists in the actual use process or the instruction source is not unified, and the mechanical refrigeration air conditioner still works for a long time, which wastes electric energy; the natural cold source is used to the maximum extent to reduce the indoor temperature to meet the requirements of the data center specification, improve the heat exchange efficiency, prolong the natural cooling time and reduce the energy consumption of the data center.

[0074] The embodiments of the application are described in detail above, but the content described is only the preferred embodiments of the application and cannot be considered as limiting the implementation scope of the application. Any equivalent changes and improvements made within the scope of the application application shall still belong to the patent coverage range of the application.

Claims

1. An indirect evaporative air conditioning control method applied to an indirect evaporative space control system, characterized in that: The method comprises the following steps, obtaining the inner circulation return air temperature and comparing the inner circulation return air temperature with the inner circulation return air temperature set value to adjust the inner circulation fan; obtaining the inner circulation supply air temperature and comparing the inner circulation supply air temperature with the inner circulation supply air temperature set value to adjust the water valve of the cold water heat exchanger; obtaining the inner circulation return air temperature and the outer circulation wet curtain inlet air temperature, and comparing the difference between the inner circulation return air temperature and the outer circulation wet curtain inlet air temperature with the temperature difference set value to adjust the outer circulation fan or the inner circulation fan; The indirect evaporative air conditioner control system comprises an outer circulation wet curtain inlet air temperature measuring device, an outer circulation wet curtain outlet air temperature measuring device, an outer circulation fan, an inner circulation fan, an inner circulation supply air temperature measuring device and an inner circulation return air temperature measuring device, wherein, The outer circulation wet curtain inlet air temperature measuring device is arranged at the air inlet end of the wet curtain and is used to measure the temperature of the air at the air inlet end of the wet curtain; The outer circulation wet curtain outlet air temperature measuring device is arranged at the air outlet end of the wet curtain and is used to measure the temperature of the air at the air outlet end of the wet curtain; The outer circulation fan is arranged in the outer circulation channel and is used to control the flow of air in the outer circulation channel; The inner circulation supply air temperature measuring device is arranged in the inner circulation supply air channel and is used to measure the temperature of the air in the inner circulation supply air channel; The inner circulation return air temperature measuring device is arranged in the inner circulation return air channel and is used to measure the temperature of the air in the inner circulation return air channel; The inner circulation fan is arranged at the air supply end of the air conditioner cooling system and is used to control the flow of air in the inner circulation supply air channel and the inner circulation return air channel.

2. The indirect evaporative air conditioning control method of claim 1, wherein: If the inner circulation return air temperature is greater than the inner circulation return air temperature set value, the speed of the inner circulation fan is increased; Otherwise, the speed of the inner circulation fan is reduced or the inner circulation fan is reduced to the minimum output.

3. The indirect evaporative air conditioning control method of claim 2, wherein: If the inner circulation supply air temperature is greater than the inner circulation supply air temperature set value, the water valve of the cold water heat exchanger is opened. Otherwise, the water valve of the cold water heat exchanger is closed or the water valve of the cold water heat exchanger is closed to the minimum output.

4. The control method of claim 1-3, wherein: If the difference between the inner circulation return air temperature and the outer circulation wet curtain inlet air temperature is greater than the temperature difference set value, the outer circulation fan is closed or the outer circulation fan is adjusted to the minimum output.

5. The indirect evaporative air conditioning control method of claim 4, wherein: If the difference between the inner circulation return air temperature and the outer circulation wet curtain inlet air temperature is greater than the temperature difference set value, the temperature of the outer circulation wet curtain after pre-cooling is obtained, and it is determined whether the temperature of the outer circulation wet curtain after pre-cooling is greater than the set value of the temperature of the outer circulation wet curtain after pre-cooling.

6. The indirect evaporative air conditioning control method of claim 5, wherein: If the temperature of the outer circulation wet curtain after pre-cooling is greater than the set value of the temperature of the outer circulation wet curtain after pre-cooling, it is determined whether the outer circulation fan reaches the maximum set value or the minimum one of k times the inner output value, if not, the speed of the inner circulation fan is increased, otherwise, the inner circulation return air temperature and the outer circulation wet curtain inlet air temperature are continuously obtained, wherein k is 0-2.

7. The indirect evaporative air conditioning control method of claim 1, wherein: The outer circulation channel and the inner circulation return air channel are provided with a heat conduction layer, so that the air in the outer circulation channel cooled by the wet curtain cools the air in the inner circulation return air channel.

8. The indirect evaporative air conditioning control method of claim 1, wherein: The inner circulation return air channel is communicated with the air inlet end of the air conditioning cooling system, the inner circulation air supply channel is communicated with the air outlet end of the air conditioning cooling system, the air in the inner circulation return air channel is cooled by the air cooled by the wet curtain and then enters the inner circulation air supply channel after being cooled by the air conditioning cooling system, and the air is circulated.

9. The indirect evaporative air conditioning control method of claim 8, wherein: The air conditioning cooling system comprises a cold water heat exchanger, and a water valve is arranged at the cooling liquid outlet end of the cold water heat exchanger.

10. The indirect evaporative air conditioner control method of claim 9, wherein: The inner circulation return air channel is arranged at the top or side of the server cabinet, the inner circulation air supply channel is arranged at the bottom or side of the server cabinet, and the wet curtain is arranged at one side of the server cabinet.

11. The control method of claim 8 or 9, wherein: The indirect evaporative air conditioner control system further comprises a control device, the control device is electrically connected with the outer circulation wet curtain air inlet temperature measuring device, the outer circulation wet curtain air outlet temperature measuring device, the outer circulation fan, the inner circulation fan, the inner circulation air supply temperature measuring device, the inner circulation return air temperature measuring device and the water valve, and the outer circulation fan, the inner circulation fan and the water valve are controlled according to the measurement results of the control device and the outer circulation wet curtain air inlet temperature measuring device, the outer circulation wet curtain air outlet temperature measuring device, the inner circulation air supply temperature measuring device and the inner circulation return air temperature measuring device.

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