CN115707209A - Indirect evaporative cooling air conditioning unit and control method thereof - Google Patents
Indirect evaporative cooling air conditioning unit and control method thereof Download PDFInfo
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- CN115707209A CN115707209A CN202110898399.XA CN202110898399A CN115707209A CN 115707209 A CN115707209 A CN 115707209A CN 202110898399 A CN202110898399 A CN 202110898399A CN 115707209 A CN115707209 A CN 115707209A
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The disclosure provides an indirect evaporative cooling air conditioning unit and a control method thereof, and belongs to the field of air conditioning systems. The indirect evaporative cooling air conditioning unit comprises a first air guide assembly, a second air guide assembly, an air heat exchanger and a control assembly; the first air guide assembly is communicated with a secondary side air inlet of the air heat exchanger; the second air guide assembly comprises at least two air guide modules which are communicated with each other, and the at least two air guide modules are sequentially arranged along the length direction of the secondary side air outlet of the air heat exchanger and are respectively communicated with the secondary side air outlet; the control component is arranged outside the air heat exchanger and electrically connected with each air guide module, and the control component is configured to control the air guide modules to convey the air flow at the secondary side air outlet to the outside or control the air guide modules to receive the air flow conveyed by the adjacent air guide modules and enable the air flow to flow back to the secondary side air inlet. This disclosure can avoid appearing the dewfall problem.
Description
Technical Field
The disclosure belongs to the field of air conditioning systems, and particularly relates to an indirect evaporative cooling air conditioning unit and a control method thereof.
Background
An indirect evaporative cooling air conditioning unit is an air conditioning system applied to a data center, and is used for adjusting the temperature inside the data center so that electronic equipment in the data center can stably work at a proper temperature.
In the related art, an indirect evaporative cooling air conditioning unit mainly includes a primary side fan, a secondary side fan, an air heat exchanger, and a spray system. The primary side fan is used for realizing air flow (primary side air flow) circulation inside the data center, and the secondary side fan is used for realizing air flow (secondary side air flow) circulation outside the data center. The air heat exchanger is positioned at the intersection of the air channels of the primary side fan and the secondary side fan, and primary side air flow can be sufficiently cooled in the process of flowing through the low-temperature air heat exchanger under the action of the spraying system and the secondary side fan, so that the effect of adjusting the internal temperature of the data center is achieved.
However, if the surface temperature of the air heat exchanger is too low, dew condensation occurs on the indoor side of the air heat exchanger (when the water vapor reaches a saturation temperature in the air, it condenses on a low-temperature object), which increases the load on the indirect evaporative cooling air conditioning unit and may freeze and crack the air heat exchanger.
Disclosure of Invention
The embodiment of the disclosure provides an indirect evaporative cooling air conditioning unit and a control method thereof, which can avoid the problem of condensation. The technical scheme is as follows:
in a first aspect, an embodiment of the present disclosure provides an indirect evaporative cooling air conditioning unit, including a first air guide assembly, a second air guide assembly, an air heat exchanger, and a control assembly;
the first air guide assembly is positioned on one side of the air heat exchanger and is communicated with a secondary side air inlet of the air heat exchanger;
the second air guide assembly is positioned on the opposite side of the air heat exchanger and comprises at least two air guide modules which are communicated with each other, and the at least two air guide modules are sequentially arranged along the length direction of a secondary side air outlet of the air heat exchanger and are respectively communicated with the secondary side air outlet;
the control assembly is located outside the air heat exchanger and electrically connected with the air guide modules, and is configured to control one part of the air guide modules to convey the air flow at the secondary side air outlet to the outside, control the other part of the air guide modules to receive the air flow conveyed by the adjacent air guide modules and enable the air flow to flow back to the secondary side air inlet.
The beneficial effects brought by the technical scheme provided by the embodiment of the disclosure at least comprise:
when the indirect evaporative cooling air conditioning unit works, under the action of the air guide module, external air enters the air heat exchanger from the secondary side air inlet and is output from the secondary side air outlet to form secondary side air flow. If the temperature of the secondary side air inlet is normal and the air heat exchanger does not have the possibility of dewing, the control component controls all the air guide modules to convey all secondary side air flows to the outside, and therefore the cooling effect of the indirect evaporative cooling air conditioning unit is guaranteed. If the temperature of the secondary side air inlet is too low, and the air heat exchanger has the possibility of dewing, the control component controls one part of the air guide module to transmit one part of the secondary side air flow to the outside, and controls the other part of the air guide module to receive the other part of the secondary side air flow transmitted by the adjacent air guide module, so that the part of the secondary side air flow passes through the air heat exchanger and is transmitted back to the secondary side air inlet. Because the secondary side airflow reflowing from the secondary side air outlet is subjected to heat exchange of the air heat exchanger, the temperature is higher, and the reflowed high-temperature secondary side airflow can be mixed with fresh air at the secondary side air inlet, so that the temperature of the airflow entering the secondary side air inlet is increased, the temperature of the air heat exchanger is further increased, and the problem of condensation of the air heat exchanger is avoided.
In a second aspect, an embodiment of the present disclosure provides a control method for an indirect evaporative cooling air conditioning unit, where the control method is applied to the indirect evaporative cooling air conditioning unit described in the first aspect, and the control method includes:
determining the air inlet temperature through a temperature sensor of the control assembly, wherein the air inlet temperature is the temperature of the air flow at the secondary side air inlet;
if the air inlet temperature is not less than the set temperature, the air guide module is controlled by the controller of the control assembly to convey the air flow at the air outlet of the secondary side to the outside, and if the air inlet temperature is less than the set temperature, the air guide module of the controller control part receives the air flow conveyed by the adjacent air guide module and enables the air flow to flow back to the air inlet of the secondary side.
The beneficial effects brought by the technical scheme provided by the embodiment of the disclosure at least comprise:
when the control method provided by the embodiment of the disclosure is used for controlling the indirect evaporative cooling air conditioning unit, the air inlet temperature at the air inlet of the secondary side is determined, and the flow direction of the secondary side air flow is controlled through the air guide module according to the air inlet temperature. If the inlet air temperature is not less than the set temperature, all the air guide modules are controlled to transmit all the secondary side air flows to the outside. If the inlet air temperature is lower than the set temperature, one part of the air guide module is controlled to transmit one part of the secondary side air flow to the outside, and the other part of the air guide module is controlled to receive the other part of the secondary side air flow transmitted by the adjacent air guide module, so that the part of the secondary side air flow passes through the air heat exchanger and is transmitted back to the secondary side air inlet. Because the secondary side airflow reflowing from the secondary side air outlet is subjected to heat exchange of the air heat exchanger, the temperature is higher, and the reflowed high-temperature secondary side airflow can be mixed with fresh air at the secondary side air inlet, so that the temperature of the airflow entering the secondary side air inlet is increased, the temperature of the air heat exchanger is further increased, and the problem of condensation of the air heat exchanger is avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an indirect evaporative cooling air conditioning unit provided in an embodiment of the present disclosure;
FIG. 2 is another schematic structural diagram of an indirect evaporative cooling air conditioning unit provided by the embodiment of the disclosure;
FIG. 3 is a schematic view of another structure of an indirect evaporative cooling air conditioning unit provided by the embodiment of the disclosure;
fig. 4 is a schematic structural view of a second wind guide assembly provided in the embodiment of the present disclosure;
fig. 5 is a schematic structural view of a first wind guide assembly provided in the embodiment of the present disclosure;
fig. 6 is a flowchart of a control method of an indirect evaporative cooling air conditioning unit according to an embodiment of the present disclosure.
The symbols in the drawings represent the following meanings:
1. a first air guide assembly; 11. an air inlet housing; 111. a third tuyere; 112. a fourth tuyere;
2. a second air guide assembly;
21. an air guide module; 211. a fan; 212. an air valve; 2121. a flap unit; 22. an air outlet shell; 221. a first tuyere; 222. a second tuyere;
3. an air heat exchanger;
31. a secondary side air inlet; 32. a secondary side air outlet;
4. a control component;
41. a temperature sensor; 42. a controller;
5. a middle channel;
6. a separator.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
The water evaporation cooling air conditioning unit is an air conditioning system applied to a data center and used for adjusting the temperature inside the data center, so that electronic equipment in the data center can stably work at a proper temperature.
In the related art, an indirect evaporative cooling air conditioning unit mainly includes a primary side fan, a secondary side fan, an air heat exchanger, and a spray system. The primary side fan is used for realizing air flow (primary side air flow) circulation inside the data center, and the secondary side fan is used for realizing air flow (secondary side air flow) circulation outside the data center. The air heat exchanger is located at the air duct intersection of the primary side fan and the secondary side fan, and primary side air flow can be sufficiently cooled in the process of flowing through the low-temperature air heat exchanger under the action of the spraying system and the secondary side fan, so that the effect of adjusting the internal temperature of the data center is achieved.
However, if the surface temperature of the air heat exchanger is too low, dew condensation occurs on the indoor side of the air heat exchanger (when the water vapor reaches a saturation temperature in the air, the water vapor condenses on an object having a low temperature). Once dew condensation occurs, the humidity of the primary side air flow is reduced, the humidification load of the indirect evaporative cooling air conditioning unit is increased, and the energy consumption is increased. Also, the condensed water condensed on the surface of the air heat exchanger may freeze, causing the air heat exchanger to freeze.
In order to solve the above technical problem, an embodiment of the present disclosure provides an indirect evaporative cooling air conditioning unit, where fig. 1 is a schematic structural diagram of the indirect evaporative cooling air conditioning unit, and with reference to fig. 1, in this embodiment, the indirect evaporative cooling air conditioning unit includes a first air guiding assembly 1, a second air guiding assembly 2, an air heat exchanger 3, and a control assembly 4.
The first air guiding assembly 1 is located at one side of the air heat exchanger 3 and is communicated with a secondary side air inlet 31 of the air heat exchanger 3. The second air guiding assembly 2 is located on the opposite side of the air heat exchanger 3, the second air guiding assembly 2 includes at least two air guiding modules 21 communicated with each other, and the at least two air guiding modules 21 are sequentially arranged along the length direction of the secondary side air outlet 32 of the air heat exchanger 3 and are respectively communicated with the secondary side air outlet 32. The control component 4 is located outside the air heat exchanger 3 and electrically connected to each air guiding module 21, and the control component 4 is configured to control one part of the air guiding modules 21 to transmit the air flow at the secondary side air outlet 32 to the outside, and control the other part of the air guiding modules 21 to receive the air flow transmitted by the adjacent air guiding modules 21 and make the air flow return to the secondary side air inlet 31.
When the indirect evaporative cooling air conditioning unit works, under the action of the air guide module 21, outside air enters the air heat exchanger 3 from the secondary side air inlet 31 and is output from the secondary side air outlet 32 to form secondary side air flow. If the temperature of the secondary air inlet 31 is normal and the air heat exchanger 3 does not have the possibility of dewing, the control component 4 controls all the air guide modules 21 to convey all the secondary air flow to the outside, so that the cooling effect of the indirect evaporative cooling air conditioning unit is ensured. If the temperature of the secondary air inlet 31 is too low, which may cause the air heat exchanger 3 to have dew condensation, the control component 4 controls one part of the air guide modules 21 to transmit a part of the secondary air flow to the outside, and the control component 4 controls another part of the air guide modules 21 to receive another part of the secondary air flow transmitted by the adjacent air guide modules 21, so that the part of the secondary air flow passes through the air heat exchanger 3 and is transmitted back to the secondary air inlet 31. Because the secondary side air flow reflowing from the secondary side air outlet 32 is subjected to heat exchange by the air heat exchanger 3, the temperature is high, and the reflowed high-temperature secondary side air flow can be mixed with fresh air at the secondary side air inlet 31, so that the temperature of the air flow entering the secondary side air inlet 31 is increased, the temperature of the air heat exchanger 3 is increased, and the problem of condensation of the air heat exchanger 3 is avoided.
As shown in fig. 1, the second wind guiding assembly 2 includes two wind guiding modules 21. Of course, the second wind guiding assembly 2 may also have other numbers of wind guiding modules 21, such as 3, 4, 5, 6, etc. Fig. 3 is a schematic structural diagram of the indirect evaporative cooling air conditioning unit when the second air guiding assembly 2 has 6 air guiding modules 21. It is easy to understand that each air guiding module is controlled by the control component 4 individually, the more the air guiding modules 21 are, the more the control on the secondary side airflow is fine, the more the structure of the second air guiding component 2 and the control logic of the control component 4 are complex, and the number of the air guiding modules 21 is not limited in the embodiment of the present disclosure.
As can be seen from the foregoing, the second air guiding assembly 2 changes the flow direction of the secondary-side air flow to enable the high-temperature secondary-side air flow to flow back to the secondary-side air inlet 31, so as to heat the air at the secondary-side air inlet 31. The second air guide assembly 2 will be described below by taking as an example a case where the second air guide assembly 2 includes two air guide modules 21.
Fig. 4 is a schematic structural diagram of the second air guiding assembly 2, and in order to show an assembling relationship between the second air guiding assembly 2 and the air heat exchanger 3, the air heat exchanger 3 is shown in fig. 4.
Referring to fig. 4, in the present embodiment, the second wind guide assembly 2 includes a wind outlet casing 22. The air outlet housing 22 extends along the length direction of the secondary air outlet 32 and is connected to the outer wall of the air heat exchanger 3, the air outlet housing 22 has a first air inlet 221 and a second air inlet 222 which are communicated with each other, and the first air inlet 221 is communicated with the secondary air outlet 32.
In the above implementation, the air outlet casing 22 is connected to the air heat exchanger 3 for providing an accommodating space and an installation foundation for the air guiding module 21. Since the outlet casing 22 has the first air opening 221 and the second air opening 222, the first air opening 221 is communicated with the secondary side air outlet 32, and the second air opening 222 is communicated with the outside, the secondary side air flow can be transmitted to the outside through the outlet casing 22.
Illustratively, the outlet casing 22 has a strip-shaped structure, the first air opening 221 is located on one side in the width direction, and the second air opening 222 is located on the other side in the width direction, so that the secondary side air flow can be facilitated to flow between the first air opening 221 and the second air opening 222.
In the present embodiment, each air guiding module 21 is located between the first air opening 221 and the second air opening 222, and is connected to the air outlet casing 22. The air guide module 21 includes a fan 211 and an air valve 212, the fan 211 is located between the first air opening 221 and the second air opening 222 and is close to the secondary air outlet 32, an air inlet of the fan 211 is communicated with the secondary air outlet 32, the fan 211 is connected with the air outlet housing 22, the air valve 212 is located on one side of the fan 211 departing from the secondary air outlet 32, and the air valve 212 is located at the second air opening 222 and is connected with the air outlet housing 22.
In the above implementation, the fan 211 is configured to suck outside air into the first air guiding assembly 1 from the secondary air inlet 31 and flow out from the secondary air outlet 32 via the air heat exchanger 3, so as to form a secondary air flow. The air valve 212 can close or expose the secondary air outlet 32 by adjusting the opening degree of the air valve.
It is easy to understand that, the larger the opening degree of the air valve 212 is, the more the secondary air outlet 32 where the air valve 212 is located is exposed, the more the secondary air flow is transmitted to the outside, and the less the secondary air flow is transmitted to the adjacent air guide module 21. Conversely, the smaller the opening of the air valve 212, the less the secondary air outlet 32 at the position of the air valve 212 is exposed, the less the secondary air flow transmitted to the outside, and the more the secondary air flow transmitted to the adjacent air guide module 21. And, when the air valve 212 is completely closed, the fan 211 corresponding to the air valve 212 also stops working, so that the secondary side air flow can flow back to the secondary side air inlet 31 from the secondary side air outlet 32 corresponding thereto, and then is mixed with fresh air, thereby increasing the temperature therein.
The description of the damper 212 is continued.
In this embodiment, the air valve 212 includes a plurality of flap units 2121, the flap units 2121 are sequentially arranged along the length direction of the secondary air outlet 32 and rotatably connected to the air outlet housing 22, when the outer sides of two adjacent flap units 2121 contact, the air valve 212 seals the second air outlet 222, i.e., seals the air outlet of the fan 211, and when the outer sides of two adjacent flap units 2121 are spaced apart, the air valve 212 exposes the second air outlet 222, i.e., exposes the air outlet of the fan 211.
In the above implementation, the flap unit 2121 is a plate-shaped structural member, and a rotation axis between the flap unit 2121 and the air outlet housing 22 is perpendicular to a length direction of the secondary air outlet 32 and is parallel to the flap unit 2121 itself. The turning angles of the flap units 2121 of the same air guiding module 21 are the same, and the flap units are turned synchronously. By adjusting the reverse angle of each flap unit 2121, the gap between the flap units 2121 can be adjusted, and the opening of each air valve 212 can be adjusted. When the flap units 2121 are perpendicular to each other, the gap between two adjacent flap units 2121 is the largest, and at this time, the opening degree of the air valve 212 is the largest, so that the secondary side airflow flowing to the outside cannot be affected. When the flap units 2121 are located on the same plane, there is no gap between two adjacent flap units 2121, and the air valve 212 is closed.
Alternatively, in order to ensure the turning synchronism of the flap unit 2121, the flap unit 2121 is driven by a rack and pinion mechanism, and a pinion is provided on the flap unit 2121 coaxially with the rotation axis of the flap unit 2121. Through the linear movement of the rack mechanism, each gear is driven to synchronously rotate, so that each plate turning unit 2121 is driven to synchronously turn over. Of course, in other embodiments, the flap units 2121 may be driven independently, for example, a motor is provided on each flap unit 2121, and the flap units 2121 are driven to turn by the motor, so that the turning angles of the flap units 2121 can be controlled independently.
With reference to fig. 4, in order to improve the uniformity of the air circulation, optionally, the number of the fans 211 is multiple, and the fans 211 are arranged at intervals along the length direction of the secondary air outlet 32.
Optionally, if the size of the air guiding module 21 is large, one air guiding module 21 may include a plurality of fans 211, and the fans 211 are arranged at intervals along the length direction of the secondary air outlet 32. If the size of the air guide module 21 is small, one air guide module 21 may only include one fan 211, and the fans 211 of each air guide module 21 are arranged at intervals along the length direction of the secondary air outlet 32.
Generally, the rest components of the indirect evaporative cooling air conditioning unit are arranged at the secondary air outlet 32 of the air heat exchanger 3, and in order to provide an arrangement space for the components, in this embodiment, the indirect evaporative cooling air conditioning unit further includes at least two intermediate channels 5, the intermediate channels 5 are located between the second air guiding component 2 and the air heat exchanger 3 and are sequentially arranged along the length direction of the secondary air outlet 32, the intermediate channels 5 are in one-to-one correspondence with the air guiding modules 21, and the intermediate channels 5 are respectively communicated with the corresponding second air guiding component 2 and the corresponding air heat exchanger 3.
In the above implementation manner, the intermediate passage 5 is used to provide an installation space for other components of the indirect evaporative cooling air conditioning unit, the intermediate passages 5 correspond to the air guide modules 21 one to one, and the secondary side air flow enters the corresponding air guide modules 21 through the intermediate passage 5 after being output from the secondary side air outlet 32.
Optionally, the indirect evaporative cooling air conditioning unit further comprises a partition plate 6, the partition plate 6 is positioned between two adjacent intermediate passages 5, and the partition plate 6 is detachably connected with the air heat exchanger 3
Through the partition plate 6, the separation between the middle channels 5 can be effectively ensured, so that the channeling of secondary side airflow between the middle channels 5 is avoided, and the flow direction of the secondary side airflow is more accurate.
Illustratively, the partition plate 6 is interposed between two adjacent intermediate passages 5, and is connected to the air heat exchanger 3 by screws.
In other embodiments, the intermediate passages 5 are integrally connected, and the partition plates 6 are disposed in the intermediate passages 5 at intervals along the length direction of the secondary air outlet 32 as required, so as to separate a plurality of independent passages corresponding to the air guide modules 21 one to one. The design is suitable for refitting the indirect evaporative cooling air conditioning unit with the integral middle channel 5, so that the indirect evaporative cooling air conditioning unit is provided with a plurality of independent middle channels 5. Therefore, the existing structure can be utilized, and the applicability of the indirect evaporative cooling air conditioning unit provided by the embodiment of the disclosure is improved.
Fig. 5 is a schematic structural diagram of the first air guiding assembly 1, and in order to show an assembling relationship between the first air guiding assembly 1 and the air heat exchanger 3, the air heat exchanger 3 is shown in fig. 5.
Referring to fig. 5, in the present embodiment, the first air guiding assembly 1 includes an air inlet housing 11, the air inlet housing 11 extends along a length direction of the secondary side air inlet 31 and is connected to an outer wall of the air heat exchanger 3, the air inlet housing 11 has a third air opening 111 and a fourth air opening 112 that are communicated with each other, and the third air opening 111 is communicated with the secondary side air inlet 31.
In the above implementation, the intake casing 11 is connected to the air heat exchanger 3 for providing an intake passage for the air heat exchanger 3. Since the intake air housing 11 has the third air opening 111 and the fourth air opening 112, the third air opening 111 communicates with the secondary-side air inlet 31, and the fourth air opening 112 communicates with the outside, the outside air can enter the air heat exchanger 3 through the intake air housing 11.
Optionally, the number of the fourth tuyere 112 is multiple, and the multiple fourth tuyeres 112 are arranged around the third tuyere 111.
Because the fourth air inlet 112 is communicated with the outside, the fourth air inlet 112 is designed to be a plurality of, and the air inlet efficiency of the air inlet shell 11 can be effectively improved. Moreover, since the fourth slits are arranged around the third air opening 111, air entering the air inlet casing 11 can rapidly enter the air heat exchanger 3 through the third air opening 111, and the air inlet efficiency of the air inlet casing 11 is further improved.
Illustratively, the air intake housing 11 has a strip-shaped structure, the third air opening 111 is located at one side in the width direction, and the fourth air opening 112 is located at both ends in the length direction.
Referring again to fig. 1, in the present embodiment, the control assembly 4 includes a temperature sensor 41 and a controller 42.
The temperature sensor 41 is located in the first air guiding assembly 1 and adjacent to the secondary air inlet 31, and the temperature sensor 41 is connected to the first air guiding assembly 1. The controller 42 is located outside the air heat exchanger 3, and is electrically connected to the temperature sensor 41 and each air guide module 21.
In the above implementation manner, the temperature sensor 41 is configured to sense the temperature of the airflow at the secondary-side air inlet 31, and the controller 42 is configured to receive a temperature parameter signal sent by the temperature sensor 41 and control the fan 211 and the air valve 212 to operate according to the temperature parameter signal, so as to achieve an automatic control effect, and enable the airflow at the secondary-side air inlet 31 to be always at a proper temperature.
For example, if the temperature sensor 41 senses that the temperature at the secondary air inlet 31 is high, all the fans 211 are normally operated, and all the air valves 212 are opened to the maximum degree, so that all the high-temperature secondary air flows are uniformly distributed to the outside, and the heat dissipation performance of the indirect evaporative cooling air conditioning unit is optimal. If the temperature sensor 41 senses that the temperature at the secondary air inlet 31 is reduced to the set temperature, part of the fans 211 is turned off, and the air valves 212 corresponding to the part of the fans 211 are closed, so that a part of the high-temperature secondary side air flow flows to the outside from the air guide module 21 which is kept open, and another part of the high-temperature secondary side air flow enters the adjacent air guide module 21 and flows back to the secondary air inlet 31 through the air heat exchanger 3 to be heated. In this state, if the temperature of the secondary-side airflow continues to decrease, the opening degree of the air valve 212 is reduced, so that a small part of the high-temperature secondary-side airflow flows to the outside, and a large part of the high-temperature secondary-side airflow flows back to the secondary-side air inlet 31 to be heated, thereby improving the heating effect. Under the state that part blast gate 212 is confined, if the temperature of secondary side air intake 31 department rises again, then increase blast gate 212's aperture for most high temperature secondary side air current flows to the external world, and the high temperature secondary side air current of small part flows back and heats to secondary side air intake 31 department, thereby reduces the effect of heating.
That is, if it is necessary to improve the warming effect, the blower 211 and the closing damper 212 are closed, or the opening degree of the damper 212 is decreased. If the heating effect needs to be reduced, the fan 211 is started, the air valve 212 is opened, or the opening degree of the air valve 212 is increased. The above actions can be performed cooperatively according to requirements, and the embodiment of the disclosure does not limit this.
Fig. 6 is a flowchart of a control method of an indirect evaporative cooling air conditioning unit according to an embodiment of the present disclosure, where the control method is suitable for the indirect evaporative cooling air conditioning unit shown in fig. 1 to 5. Referring to fig. 6, the control method includes:
step 601: the temperature of the inlet air, which is the temperature of the air flow at the secondary air inlet 31, is determined by the temperature sensor 41 of the control module 4.
Through step 601, the temperature of the inlet air can be obtained, so that a data basis is provided for adjusting the inlet air module in the subsequent step.
Step 602: and judging whether the inlet air temperature is lower than the set temperature. If the inlet air temperature is not less than the set temperature, go to step 603, and if the inlet air temperature is less than the set temperature, go to step 604.
The set temperature is exemplarily an artificial set value, and can be set according to requirements.
For example, if the temperature of the primary airflow input by the indirect evaporative cooling air conditioning unit for the data center is 22 ℃ (which may be equivalent to the indoor temperature of the air heat exchanger 3, here, the lowest temperature of the air heat exchanger 3), and the humidity is 40%, the corresponding dew point temperature is 7.8 ℃. And assuming that the rated heat exchange temperature difference of the air heat exchanger 3 is 6 ℃, the air inlet temperature is controlled to be more than 2 ℃, so that the indoor temperature of the air heat exchanger 3 can be ensured to be more than 8 ℃ and more than 7.8 ℃ of the dew point temperature, and the condensation temperature can not be generated.
Step 603: the controller 42 of the control component 4 controls the air guiding module 21 to deliver the air flow at the secondary air outlet 32 to the outside.
Through step 603, all high-temperature secondary side air flows can be transmitted to the outside from the second air guide assembly 2, so that the cooling effect of the indirect evaporative cooling air conditioning unit can be ensured, and the influence caused by the arrangement of the second air guide assembly 2 and other components can be avoided.
Step 604: the air guiding module 21 controlled by the controller 42 receives the air flow sent by the adjacent air guiding module 21 and makes the air flow back to the secondary side air inlet 31.
Note that, a partial air guide module 21 refers to at least one complete air guide module 21 in all the air guide modules 21. For example, if there are 6 air guide modules 21, then a part of the air guide modules 21 refers to 1, 2, 3, 4, 5 air guide modules 21 in the 6 air guide modules 21.
In step 604, only a portion of the secondary air flow is transmitted to the outside through the air guiding module 21, and the other portion of the secondary air flow passes through the adjacent air guiding module 21 and the air heat exchanger 3 in sequence and is transmitted back to the secondary air inlet 31 to heat the air at the secondary air inlet 31.
That is to say, when the indirect evaporative cooling air conditioning unit is controlled by the control method provided in the embodiment of the present disclosure, the temperature of the intake air at the secondary air inlet 31 is determined, and the flow direction of the secondary air flow is controlled by the air guide module 21 according to the intake air temperature. If the inlet air temperature is not less than the set temperature, all the air guide modules 21 are controlled to transmit all the secondary side air flows to the outside. If the temperature of the inlet air is lower than the set temperature, one part of the air guide modules 21 is controlled to transmit one part of the secondary side air flow to the outside, and the other part of the air guide modules 21 is controlled to receive the other part of the secondary side air flow transmitted by the adjacent air guide modules 21, so that the part of the secondary side air flow passes through the air heat exchanger 3 and is transmitted back to the secondary side air inlet 31. Because the secondary side air flow returning from the secondary side air outlet 32 is subjected to heat exchange by the air heat exchanger 3, the temperature is high, and the part of returned high-temperature secondary side air flow can be mixed with fresh air at the secondary side air inlet 31, so that the temperature of the air flow entering the secondary side air inlet 31 is increased, the temperature of the air heat exchanger 3 is increased, and the problem of condensation of the air heat exchanger 3 is avoided.
The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.
Claims (10)
1. An indirect evaporative cooling air conditioning unit is characterized by comprising a first air guide assembly (1), a second air guide assembly (2), an air heat exchanger (3) and a control assembly (4);
the first air guide assembly (1) is positioned on one side of the air heat exchanger (3) and is communicated with a secondary side air inlet (31) of the air heat exchanger (3);
the second air guide assembly (2) is located on the opposite side of the air heat exchanger (3), the second air guide assembly (2) comprises at least two air guide modules (21) which are communicated with each other, and the at least two air guide modules (21) are sequentially arranged along the length direction of a secondary side air outlet (32) of the air heat exchanger (3) and are respectively communicated with the secondary side air outlet (32);
the control component (4) is located outside the air heat exchanger (3) and electrically connected with each air guide module (21), and the control component (4) is configured to control the air guide module (21) to convey the air flow at the secondary side air outlet (32) to the outside, or control the air guide module (21) to receive the air flow conveyed by the adjacent air guide module (21) and make the air flow back to the secondary side air inlet (31).
2. The indirect evaporative cooling air conditioning unit of claim 1, wherein the air guide module (21) comprises a fan (211) and an air valve (212);
the fan (211) is close to the secondary side air outlet (32), and an air inlet of the fan (211) is communicated with the secondary side air outlet (32);
the air valve (212) is located on one side, deviating from the secondary side air outlet (32), of the fan (211) and is communicated with the air outlet of the fan (211).
3. The indirect evaporative cooling air conditioning unit of claim 2, wherein the damper (212) comprises a plurality of flap units (2121);
the plurality of flap units (2121) are sequentially arranged along the length direction of the secondary side air outlet (32);
when the outer sides of two adjacent flap units (2121) are in contact, the air valve (212) closes the air outlet of the fan (211), and when the outer sides of two adjacent flap units (2121) are spaced, the air valve (212) exposes the air outlet of the fan (211).
4. The indirect evaporative cooling air conditioning unit of claim 2, wherein the fan (211) is a plurality of;
the fans (211) are arranged at intervals along the length direction of the secondary side air outlet (32).
5. The indirect evaporative cooling air conditioning unit of claim 1, wherein the second air guiding assembly (2) further comprises an air outlet casing (22);
the air outlet shell (22) extends along the length direction of the secondary side air outlet (32) and is connected with the outer wall of the air heat exchanger (3), the air outlet shell (22) is provided with a first air opening (221) and a second air opening (222) which are communicated with each other, and the first air opening (221) is communicated with the secondary side air outlet (32);
each air guide module (21) is located between the first air opening (221) and the second air opening (222) and connected with the air outlet casing (22).
6. The indirect evaporative cooling air conditioning unit of any of claims 1 to 5, further comprising at least two intermediate passages (5);
the middle channels (5) are located between the second air guide assemblies (2) and the air heat exchangers (3) and are sequentially arranged along the length direction of the secondary side air outlets (32), the middle channels (5) correspond to the air guide modules (21) one by one, and the middle channels (5) are respectively communicated with the corresponding second air guide assemblies (2) and the corresponding air heat exchangers (3).
7. The indirect evaporative cooling air conditioning unit of claim 6, further comprising a partition (6);
the partition plate (6) is positioned between two adjacent intermediate passages (5), and the partition plate (6) is detachably connected with the air heat exchanger (3).
8. The indirect evaporative cooling air conditioning unit of any of claims 1 to 5, wherein the first air guiding assembly (1) comprises an air intake housing (11);
the air inlet shell (11) extends along the length direction of the secondary side air inlet (31) and is connected with the outer wall of the air heat exchanger (3), the air inlet shell (11) is provided with a third air opening (111) and a fourth air opening (112) which are communicated with each other, and the third air opening (111) is communicated with the secondary side air inlet (31).
9. The indirect evaporative cooling air conditioning unit of any of claims 1 to 5, wherein the control assembly (4) comprises a temperature sensor (41) and a controller (42);
the temperature sensor (41) is positioned in the first air guide assembly (1) and is adjacent to the secondary side air inlet (31), and the temperature sensor (41) is connected with the first air guide assembly (1);
the controller (42) is located outside the air heat exchanger (3) and is respectively and electrically connected with the temperature sensor (41) and each air guide module (21).
10. A control method for an indirect evaporative cooling air conditioning unit, which is applied to the indirect evaporative cooling air conditioning unit of any one of claims 1 to 9, the control method comprising:
determining the temperature of inlet air through a temperature sensor (41) of the control component (4), wherein the inlet air temperature is the temperature of air flow at the secondary side air inlet (31);
if the air inlet temperature is not lower than the set temperature, the air guide module (21) is controlled by the controller (42) of the control component (4) to convey the air flow at the secondary side air outlet (32) to the outside, and if the air inlet temperature is lower than the set temperature, the air guide module (21) of the control part of the controller (42) receives the air flow conveyed by the adjacent air guide module (21) and enables the air flow to flow back to the secondary side air inlet (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110898399.XA CN115707209A (en) | 2021-08-05 | 2021-08-05 | Indirect evaporative cooling air conditioning unit and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110898399.XA CN115707209A (en) | 2021-08-05 | 2021-08-05 | Indirect evaporative cooling air conditioning unit and control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115707209A true CN115707209A (en) | 2023-02-17 |
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ID=85179886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110898399.XA Pending CN115707209A (en) | 2021-08-05 | 2021-08-05 | Indirect evaporative cooling air conditioning unit and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115707209A (en) |
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2021
- 2021-08-05 CN CN202110898399.XA patent/CN115707209A/en active Pending
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