CN218269373U

CN218269373U - Air conditioning system

Info

Publication number: CN218269373U
Application number: CN202221895677.2U
Authority: CN
Inventors: 白本通
Original assignee: Shenzhen Bojian Technology Co ltd
Current assignee: Shenzhen Bojian Technology Co ltd
Priority date: 2022-07-21
Filing date: 2022-07-21
Publication date: 2023-01-10
Anticipated expiration: 2032-07-21

Abstract

The utility model discloses an air conditioning system, which comprises a refrigeration host, a first cooling component, an air conditioning end, a precooling coil and a plate heat exchanger, wherein the refrigeration host comprises a condenser and an evaporator; the first cooling assembly is connected with the condenser; the tail end of the air conditioner is respectively connected with the evaporator and the first cooling assembly; the pre-cooling coil is respectively connected with the first cooling assembly and the tail end of the air conditioner; the plate heat exchanger is respectively connected with the first cooling assembly, the condenser, the evaporator and the tail end of the air conditioner; the air conditioning system has multiple refrigeration modes, and the air conditioning system can switch between multiple refrigeration modes according to the environment dry bulb temperature. The air conditioning system provided by the application can make full use of a cold source in an outdoor environment, reduces the power consumed by cold energy generated in the air conditioning system, improves the energy efficiency ratio of the air conditioning system, and further reduces the power supply use efficiency of the air conditioning system.

Description

Air conditioning system

Technical Field

The utility model relates to an air conditioning technology field, in particular to air conditioning system.

Background

At present, along with the rapid development of information industry digital construction, the number of machine rooms and base stations is rapidly increased, the energy consumption of air conditioners of the machine rooms and the base stations accounts for more than 40% of the total energy consumption according to statistics, and because the sensible heat load of the machine rooms is large, the enclosure structure is closed, and the air conditioners operate all weather all the year round, the currently used air conditioning systems cannot adjust different refrigeration modes according to outdoor temperature changes, and cannot fully utilize outdoor natural cold sources to cool, so that the energy-saving requirement of the air conditioning systems of the machine rooms cannot be met.

SUMMERY OF THE UTILITY MODEL

Based on this, it is necessary to provide an energy efficient air conditioning system.

An air conditioning system comprising:

the refrigeration main machine comprises a condenser and an evaporator;

the first cooling assembly is connected with the condenser and used for cooling water output by the condenser and outputting the cooled cooling water to the condenser;

the air conditioner tail end is respectively connected with the evaporator and the first cooling assembly;

the pre-cooling coil is connected with the first cooling assembly, the pre-cooling coil is used for heat exchange between air and cooled cooling water output by the first cooling assembly so as to cool the air, and the first cooling assembly is used for heat exchange between the cooled air and the cooling water so as to cool the cooling water; the pre-cooling coil is also connected with the tail end of the air conditioner and is used for heat exchange between the chilled water output by the tail end of the air conditioner and inlet air so as to cool the chilled water; and

the plate heat exchanger is respectively connected with the first cooling assembly, the condenser, the evaporator and the air conditioner tail end and is used for enabling chilled water output by the air conditioner tail end to exchange heat with cooling water output by the first cooling assembly;

the air conditioning system is provided with a first refrigeration mode, a second refrigeration mode, a third refrigeration mode and a fourth refrigeration mode, and can be switched among the first refrigeration mode, the second refrigeration mode, the third refrigeration mode and the fourth refrigeration mode according to the ambient dry bulb temperature;

in the first refrigeration mode, the first cooling assembly is used for cooling the cooling water output by the condenser, and the evaporator is used for cooling the chilled water output by the air conditioner tail end to provide cooling capacity for the air conditioner tail end;

in the second refrigeration mode, the first cooling assembly is used for cooling the cooling water output by the condenser, and the evaporator is matched with the plate heat exchanger to cool the chilled water output by the tail end of the air conditioner;

in the third refrigeration mode, the pre-cooling coil is used for cooling the chilled water output by the tail end of the air conditioner;

in a fourth refrigeration mode, the pre-cooling coil is used for cooling the chilled water output by the air conditioner terminal, and the chilled water output by the air conditioner terminal is also used for mixing with the cooled chilled water so as to increase the temperature of the cooled chilled water.

In one embodiment, the first cooling assembly includes a first spraying device, a first filler, a first water tank, and a fan, the first spraying device is disposed above the first filler, the first water tank is disposed below the first filler, the fan is disposed above the first spraying device, the first spraying device is connected to the condenser, the plate heat exchanger includes a first inlet, a first outlet, a second inlet, and a second outlet, the first spraying device is connected to the first outlet of the plate heat exchanger, one end of the first water tank is connected to the first inlet, one end of the first water tank is further connected to the first spraying device, the other end of the first water tank is connected to the pre-cooling coil, the first outlet is further connected to the condenser, the second inlet is connected to the air conditioner terminal, and the second outlet is connected to the evaporator.

In one embodiment, the air conditioning system further includes a second cooling assembly, the second cooling assembly includes a second spraying device, a second filler, and a second water tank, the second spraying device is disposed above the second filler, the second filler is disposed beside the pre-cooling coil, the second water tank is disposed below the second filler, and the second water tank is connected to the second spraying device.

In one embodiment, the air conditioning system further comprises at least one of:

the number of the cooling pumps is multiple, one cooling pump is arranged at one end of the first water tank to provide power for the cooling water of the first water tank to be input into the first spraying device, the plate heat exchanger and the condenser, and the other cooling pump is arranged at the other end of the first water tank to provide power for the cooling water of the first water tank to be input into the pre-cooling coil and the evaporator; and

the refrigerating pump, the quantity of refrigerating pump is a plurality of, and one of them the refrigerating pump sets up the air conditioner terminal with on the common route of the connecting path between the precooling coil pipe with the air conditioner terminal with the connecting path between the first spray set, in order for the terminal refrigerated water of air conditioner input to the precooling coil pipe first spray set provides power, another the refrigerating pump sets up the one end of second basin, for the refrigerated water input of second basin extremely second spray set provides power.

In one embodiment, the air conditioning system further includes a valve body including the first, second, third, fourth, fifth, sixth, seventh, and eighth three-way valves, the first three-way valve is disposed between the evaporator and the air conditioning terminal, the second three-way valve is disposed between the second outlet and the evaporator, the first three-way valve is connected to the second three-way valve, the third three-way valve is disposed between the second inlet and the air conditioning terminal, the fourth three-way valve is disposed between the second inlet and the air conditioning terminal, the fifth three-way valve is disposed between the second outlet and the evaporator, and the fourth three-way valve is connected to the fifth three-way valve, the sixth three-way valve is disposed between the first water tank and the pre-cooling coil, the seventh three-way valve is disposed between the second outlet and the evaporator, and the sixth three-way valve is connected to the seventh three-way valve, the eighth three-way valve is disposed between the pre-cooling coil and the first spray device, and the eighth three-way valve is connected to the third three-way valve.

In one embodiment, the air conditioning system further includes a controller, the controller is respectively connected to the refrigeration host, the first cooling module, the plate heat exchanger, the cooling pump, the freezing pump and the valve body, and the controller is configured to detect an ambient dry bulb temperature and control operating states of the refrigeration host, the first cooling module, the plate heat exchanger, the cooling pump, the freezing pump and the valve body according to the ambient dry bulb temperature, so as to control the air conditioning system to switch among the first refrigeration mode, the second refrigeration mode, the third refrigeration mode and the fourth refrigeration mode.

The air conditioning system provided by the application can control the refrigeration host machine according to the ambient dry bulb temperature, the first cooling assembly, the air conditioning tail end, the running states of the pre-cooling coil pipe and the plate type heat exchanger and the refrigeration host machine, the first cooling assembly, the air conditioning tail end and the on-off of the connecting path between the pre-cooling coil pipe and the plate type heat exchanger, so that the air conditioning system can be switched between the first refrigeration mode, the second refrigeration mode, the third refrigeration mode and the fourth refrigeration mode, the air conditioning system can adjust the refrigeration modes of the air conditioning system under different ambient dry bulb temperature conditions according to the outdoor ambient dry bulb temperature, the third refrigeration mode and the fourth refrigeration mode can realize the cooling of chilled water in the pre-cooling coil pipe through an outdoor cold source, the cold quantity is provided for the air conditioning tail end, the natural cold source in the outdoor environment is fully utilized, the power consumed by the air conditioning system due to the generation is reduced on the premise of meeting the refrigeration requirements of a machine room, and the energy conservation and emission reduction requirements of the air conditioning system are further realized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic diagram of an embodiment of an air conditioning system;

FIG. 2 is a schematic diagram of a first cooling mode of the air conditioning system according to an embodiment;

FIG. 3 is a schematic diagram of a second cooling mode of the air conditioning system according to an embodiment;

FIG. 4 is a schematic diagram of a third cooling mode of the air conditioning system according to an embodiment;

FIG. 5 is a schematic diagram of a fourth cooling mode of the air conditioning system according to an embodiment;

fig. 6 is a flowchart illustrating a control method of an air conditioning system according to an embodiment.

Part name and sequence number in the figure: 1. a refrigeration host machine; 11. a condenser; 12. an evaporator; 2. a first cooling assembly; 21. a first spraying device; 22. a first filler; 23. a first water tank; 24. a fan; 3. An air conditioner terminal; 4. pre-cooling the coil pipe; 5. a plate heat exchanger; 51. a first inlet; 52. a first outlet; 53. a second inlet; 54. a second outlet; 6. a second cooling assembly; 61. a second spraying device; 62. A second filler; 63. a second water tank; 7. a cooling pump; 8. a freeze pump; 9. a valve body; 91. a first three-way valve; 92. a second three-way valve; 93. a third three-way valve; 94. a fourth three-way valve; 95. a fifth three-way valve; 96. a sixth three-way valve; 97. a seventh three-way valve; 98. an eighth three-way valve; 99. a two-way valve.

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, back, 8230; \8230;) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

Furthermore, the descriptions in the present application related to "first", "second", etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or to imply that the number of technical features indicated are implicitly being indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In addition, "and/or" in the whole text includes three schemes, taking a and/or B as an example, including a technical scheme, and a technical scheme that a and B meet simultaneously; in addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

Referring to fig. 1, an air conditioning system includes a refrigeration host 1, a first cooling assembly 2, an air conditioning terminal 3, a pre-cooling coil 4 and a plate heat exchanger 5, where the refrigeration host 1 includes a condenser 11 and an evaporator 12; the first cooling module 2 is connected with the condenser 11, and the first cooling module 2 is used for cooling the cooling water output by the condenser 11 and outputting the cooled cooling water to the condenser 11; the air conditioner tail end 3 is respectively connected with the evaporator 12 and the first cooling assembly 2; the pre-cooling coil 4 is connected with the first cooling assembly 2, the pre-cooling coil 4 is used for heat exchange between inlet air and cooled cooling water output by the first cooling assembly 2 so as to cool the inlet air, and the first cooling assembly 2 is used for heat exchange between the cooled inlet air and the cooling water so as to cool the cooling water; the pre-cooling coil 4 is also connected with the air conditioner tail end 3, and the pre-cooling coil 4 is also used for heat exchange between the chilled water output by the air conditioner tail end 3 and inlet air so as to cool the chilled water; the plate type heat exchanger 5 is respectively connected with the first cooling assembly 2, the condenser 11, the evaporator 12 and the air conditioner tail end 3, and the plate type heat exchanger 5 is used for carrying out heat exchange on chilled water output by the air conditioner tail end 3 and cooling water output by the first cooling assembly 2;

in the first refrigeration mode, the first cooling assembly 2 is used for cooling the cooling water output by the condenser 11, and the evaporator 12 is used for cooling the chilled water output by the air conditioner terminal 3 to provide cold energy for the air conditioner terminal 3;

in the second refrigeration mode, the first cooling assembly 2 is used for cooling the cooling water output by the condenser 11, and the evaporator 12 is matched with the plate heat exchanger 5 to cool the chilled water output by the air conditioner terminal 3;

in a third refrigeration mode, the pre-cooling coil 4 is used for cooling chilled water output by the air conditioner terminal 3;

in the fourth refrigeration mode, the pre-cooling coil 4 is used for cooling the chilled water output by the air conditioner terminal 3, and the chilled water output by the air conditioner terminal 3 is also used for mixing with the cooled chilled water to increase the temperature of the cooled chilled water.

The air conditioning system provided by the application can control the refrigeration host 1, the first cooling assembly 2, the air conditioning tail end 3, the running states of the pre-cooling coil 4 and the plate type heat exchanger 5 and the connection and disconnection of the connection path between the pre-cooling coil 4 and the plate type heat exchanger 5 according to the ambient dry bulb temperature, so that the air conditioning system can switch between the first refrigeration mode, the second refrigeration mode, the third refrigeration mode and the fourth refrigeration mode, the air conditioning system can adjust the refrigeration modes of the air conditioning system under different ambient dry bulb temperature conditions according to the outdoor ambient dry bulb temperature, the third refrigeration mode and the fourth refrigeration mode can cool chilled water in the coil 4 through an outdoor cold source, cold quantity is provided for the air conditioning tail end 3, natural cold sources in the outdoor environment are fully utilized, the power consumed by the air conditioning system due to the cold quantity generated is reduced on the premise that the refrigeration requirements of a machine room are met, and the energy conservation and emission reduction requirements of the air conditioning system are further met.

Specifically, in the first cooling mode, the flow path of the cooling water includes a first path, which is the condenser 11-the first cooling module 2, a second path, and a third path; the second path is condenser 11-first cooling module 2-condenser 11; the third path is condenser 11-first cooling module 2-pre-cooling coil 4-first cooling module 2; the path of the chilled water is evaporator 12-air conditioner terminal 3-evaporator 12;

in the second cooling mode, the path of the cooling water includes a fourth path, a fifth path and a sixth path, the fourth path condenser 11-the first cooling module 2-the plate heat exchanger 5-the first cooling module 2; the fifth path is a condenser 11, a first cooling assembly 2, a plate heat exchanger 5 and a condenser 11; the sixth path is the same as the third path; the path of the chilled water is evaporator 12-air conditioner tail end 3-plate heat exchanger 5-evaporator 12;

in the third refrigeration mode, the path of the chilled water comprises a seventh path and an eighth path, wherein the seventh path is from the air conditioner end 3 to the pre-cooling coil 4 to the air conditioner end 3, and the eighth path is from the air conditioner end 3 to the air conditioner end 3;

in the fourth refrigeration mode, the path of the chilled water includes a ninth path and a tenth path, the ninth path is from the air conditioner end 3 to the pre-cooling coil 4 to the air conditioner end 3, the tenth path is from the air conditioner end 3 to the air conditioner end 3, and in the tenth path, the chilled water output by the air conditioner end 3 is mixed with the chilled water output by the pre-cooling coil 4 and then returns to the air conditioner end 3.

Referring to fig. 1, the first cooling assembly 2 includes a first spraying device 21, a first filler 22, a first water tank 23 and a fan 24, the first spraying device 21 is disposed above the first filler 22, the first water tank 23 is disposed below the first filler 22, the fan 24 is disposed above the first spraying device 21, the first spraying device 21 is connected to the condenser 11, the plate heat exchanger 5 includes a first inlet 51, a first outlet 52, a second inlet 53 and a second outlet 54, the first spraying device 21 is connected to the first outlet 52 of the plate heat exchanger 5, one end of the first water tank 23 is connected to the first inlet 51, one end of the first water tank 23 is further connected to the first spraying device 21, the other end of the first water tank 23 is connected to the pre-cooling coil 4, the first outlet 52 is further connected to the condenser 11, the second inlet 53 is connected to the air conditioner terminal 3, and the second outlet 54 is connected to the evaporator 12.

Specifically, the cooling water output from the condenser 11 is sprayed into the first filler 22 through the first spraying device 21 and exchanges heat with the intake air output from the pre-cooling coil 4 in the first filler 22 to cool the cooling water, and the cooling water of the cooling water enters the first water tank 23 and is input to the first spraying device 21, the plate heat exchanger 5 and the condenser 11.

Referring to fig. 1 and 2, the air conditioning system further includes a second cooling assembly 6, the second cooling assembly 6 includes a second spraying device 61, a second filler 62 and a second water tank 63, the second spraying device 61 is disposed above the second filler 62, the second filler 62 is disposed beside the pre-cooling coil 4, the second water tank 63 is disposed below the second filler 62, and the second water tank 63 is connected to the second spraying device 61.

Specifically, the chilled water in the second water tank 63 is conveyed to the second spraying device 61 and sprayed into the second filler 62 through the second spraying device 61, and the chilled water and the inlet air output by the pre-cooling coil 4 exchange heat in the second filler, so that the inlet air temperature entering the first cooling assembly 2 is further reduced, the evaporation capacity of the cooling water is increased, and the cooling water is further cooled.

Referring to fig. 1 to 3, the air conditioning system further includes a plurality of cooling pumps 7 and a plurality of refrigeration pumps 8, where one cooling pump 7 is disposed at one end of the first water tank 23 to provide power for inputting the cooling water of the first water tank 23 to the first spraying device 21, the plate heat exchanger 5, and the condenser 11, and the other cooling pump 7 is disposed at the other end of the first water tank 23 to provide power for inputting the cooling water of the first water tank 23 to the pre-cooling coil 4 and the evaporator 12; one of the freezing pumps 8 is arranged on a common path of a connection path between the air conditioner tail end 3 and the pre-cooling coil 4 and a connection path between the air conditioner tail end 3 and the first spraying device 21 so as to provide power for inputting the chilled water of the air conditioner tail end 3 into the pre-cooling coil 4 and the first spraying device 21, and the other freezing pump 8 is arranged at one end of the second water tank 63 so as to provide power for inputting the chilled water of the second water tank 63 into the second spraying device 61.

Referring to fig. 1, the air conditioning system further includes a valve body 9, the valve body 9 includes a first three-way valve 91, a second three-way valve 92, a third three-way valve 93, a fourth three-way valve 94, a fifth three-way valve 95, a sixth three-way valve 96, a seventh three-way valve 97 and an eighth three-way valve 98, the first three-way valve 91 is disposed between the evaporator 12 and the air conditioning terminal 3, the second three-way valve 92 is disposed between the second outlet 54 and the evaporator 12, the first three-way valve 91 is connected to the second three-way valve 92, the third three-way valve 93 is disposed between the second inlet 53 and the air conditioning terminal 3, the fourth three-way valve 94 is disposed between the second inlet 53 and the air conditioning terminal 3, the fifth three-way valve 95 is disposed between the second outlet 54 and the evaporator 12, and the fourth three-way valve 94 is connected to the fifth three-way valve 95, the sixth three-way valve 96 is disposed between the first water tank 23 and the pre-cooling coil 4, the seventh three-way valve 97 is disposed between the second outlet 54 and the evaporator 12, and the sixth three-way valve 96 is connected to the eighth three-way valve 93.

Specifically, the valve body 9 further includes a two-way valve 99, and the two-way valve 99 is disposed between the first water tank 23 and the first shower device 21.

The air conditioning system further comprises a controller, the controller is respectively connected with the refrigeration host machine 1, the first cooling assembly 2, the plate type heat exchanger 5, the cooling pump 7, the freezing pump 8 and the valve body 9, and the controller is used for detecting the ambient dry bulb temperature and controlling the running states of the refrigeration host machine 1, the first cooling assembly, the plate type heat exchanger 5, the cooling pump 7, the freezing pump 8 and the valve body 9 according to the ambient dry bulb temperature so as to control the air conditioning system to be switched among a first refrigeration mode, a second refrigeration mode, a third refrigeration mode and a fourth refrigeration mode.

Specifically, the controller can realize air conditioning system's automated control, has reduced the cost of labor.

Referring to fig. 6, the control method of the air conditioning system of the present invention includes the following steps:

detecting the temperature of the environmental dry bulb;

when the ambient dry bulb temperature is higher than a first preset temperature, the refrigeration host 1, the fan 24, the cooling pump 7, the freezing pump 8, the first spraying device 21 and the second spraying device 61 are started, the plate heat exchanger 5 is closed, and a first refrigeration mode is started;

when the ambient dry bulb temperature is less than or equal to a first preset temperature and greater than a second preset temperature, starting the refrigeration host 1, the fan 24, the cooling pump 7, the freezing pump 8, the first spraying device 21, the second spraying device 61 and the plate heat exchanger 5, and starting a second refrigeration mode;

when the ambient dry bulb temperature is less than or equal to a second preset temperature and greater than a third preset temperature, the refrigeration host 1, the plate heat exchanger 5 and the cooling pump 7 are closed, the fan 24 and the freezing pump 8 are started, and a third refrigeration mode is started;

when the temperature of the environmental dry bulb is less than or equal to a third preset temperature, only the freezing pump 8 is started, a certain amount of glycol solution is added into the frozen water at the tail end 3 of the air conditioner, and the fourth refrigeration mode is started.

According to the control method of the air conditioning system, the running states of the refrigeration host 1, the first cooling assembly 2, the air conditioning tail end 3, the precooling coil 4 and the plate type heat exchanger 5 and the connection and disconnection of the refrigeration host 1, the first cooling assembly 2, the air conditioning tail end 3, the precooling coil 4 and the plate type heat exchanger 5 are controlled to change the circulation paths of cooling water and chilled water in the air conditioning system, so that the refrigeration mode of the air conditioning system is automatically switched, the labor cost is reduced, a cold source in the outdoor environment is fully utilized, the power consumed by cold energy generated in the air conditioning system is reduced, the energy efficiency ratio of the air conditioning system is improved, and the power supply use efficiency of the air conditioning system is further reduced.

Specifically, in the present embodiment, the first preset temperature is 35 ℃, the second preset temperature is 16 ℃, and the third preset temperature is 5 ℃.

Specifically, referring to fig. 1-2, in the first refrigeration mode, because the ambient dry bulb temperature is too high, the evaporator 12 is used to cool the chilled water output by the air conditioner terminal 3 to provide cooling capacity for the air conditioner terminal 3, the first cooling assembly 2 is used to cool the cooling water output by the condenser 11 to cool the host, so as to prevent the host from being damaged due to too high temperature in the operation process, and the second cooling assembly 6 is turned on to further cool the intake air output by the pre-cooling coil 4 and cooled after heat exchange with the cooling water, so as to further cool the cooling water.

The cooling water flow path of the first cooling mode is as follows: the cooling water is output from the condenser 11 to the first spraying device 21, after the first filler 22 exchanges heat with the intake air output by the pre-cooling coil 4, the cooled cooling water enters the first water tank 23, the cooling water output from the first water tank 23 includes a first path, a second path and a third path, the first path is that the cooling water of the first water tank 23 enters the condenser 11 and the pipeline of the first spraying device 21 through the cooling pump 7 and the two-way valve 99 to pre-cool the cooling water output by the condenser 11, and then enters the first water tank 23. The cooling water in the second path of the first water tank 23 is directly output to the condenser 11 by the cooling pump 7. The third path is that the cooling water in the first water tank 23 is delivered to the pre-cooling coil 4 through the cooling pump 7, and then delivered from the pre-cooling coil 4 to the first spraying device 21, and exchanges heat with the inlet air output by the pre-cooling coil 4 again at the first filler 22.

The chilled water in the first cooling mode passes through the path, namely the chilled water output by the evaporator 12, is subjected to heat exchange at the air conditioner terminal 3 and then is returned to the evaporator 12.

Specifically, referring to fig. 1 and 3, the ambient dry bulb temperature in the second refrigeration mode is lower than that in the first refrigeration mode, and the plate heat exchanger 5 is opened, so that the cooled cooling water output by the first cooling assembly 2 and the chilled water output by the air conditioner terminal 3 can perform heat exchange in the plate heat exchanger 5 to cool the chilled water output by the air conditioner terminal 3, thereby reducing the power consumed by the evaporator 12 for cooling the chilled water, and achieving the effect of saving energy.

The cooling water flow path in the second cooling mode is as follows: the cooling water is output from the condenser 11 to the first spraying device 21, after the first filler 22 exchanges heat with the inlet air output by the pre-cooling coil 4, the cooled cooling water enters the first water tank 23, the cooling water output from the first water tank 23 includes a fourth path, a fifth path and a sixth path, the fifth path and the fourth path are respectively that the cooling water of the first water tank 23 is conveyed to the first inlet 51 of the plate heat exchanger 5 through the cooling pump 7, after the cooling water exchanges heat with the chilled water output by the air conditioner terminal 3 in the plate heat exchanger 5, a part of the cooling water is output to the condenser 11 from the first outlet 52 of the plate heat exchanger 5, the other part of the cooling water enters a pipeline between the condenser 11 and the first spraying device 21 through the two-way valve to pre-cool the cooling water output by the condenser 11, and the sixth path is the same as the third path.

Specifically, the path through which the chilled water flows in the second cooling mode is as follows: the chilled water output by the air conditioner terminal 3 enters from the second inlet 53 of the plate heat exchanger 5, and after the plate heat exchanger 5 exchanges heat with the cooling water output by the first water tank 23, the chilled water is output from the second outlet 54 of the plate heat exchanger 5 to the evaporator 12, further cooled in the evaporator 12, and finally output from the evaporator 12 to the air conditioner terminal 3 to provide cooling capacity for the air conditioner terminal 3.

Specifically, referring to fig. 1 and 4, the ambient dry bulb temperature in the third refrigeration mode is low, and the outdoor cold source can generate enough cold to meet the refrigeration requirement of the machine room, so that the circulation of cooling water is not involved, the refrigeration host 1 can be closed, the inlet air directly provides cold for the air conditioner terminal 3 through the precooling coil 4, the power consumption of the refrigeration host 1, the cooling pump 7 and the second refrigeration component is reduced, and the energy is saved.

The path of the chilled water flowing through the third cooling mode is as follows: the chilled water output from the air-conditioning terminal 3 includes a seventh path and an eighth path, and the seventh path is: chilled water output by the air conditioner tail end 3 is output to the pre-cooling coil 4 through the refrigerating pump 8, heat exchange is carried out between the chilled water and inlet air in the pre-cooling coil 4, and the chilled water after cooling is directly returned to the air conditioner tail end 3 to provide cooling capacity for the air conditioner tail end 3. The eighth path is: the chilled water output from the air conditioner terminal 3 enters the pipeline between the pre-cooling coil 4 and the inlet of the air conditioner terminal 3 through the fourth three-way valve 94, and is mixed with the chilled water output from the pre-cooling coil 4, so as to adjust the temperature of the chilled water entering the air conditioner terminal 3.

Specifically, the environment dry bulb temperature of the fourth refrigeration mode is lower than that of the third refrigeration mode, the cold energy generated by an outdoor cold source is greater than the refrigeration requirement of a machine room, therefore, chilled water output by the air conditioner terminal 3 needs to be mixed with chilled water output by the pre-cooling coil 4, the temperature of the chilled water entering the air conditioner terminal 3 is increased, then the air conditioner terminal 3 is entered, the fourth refrigeration mode does not need to start the refrigeration host 1, the first cooling assembly 2, the cooling pump 7 and the second cooling assembly 6, circulation of cooling water is not involved, power consumption is further reduced, and energy is saved.

Referring to fig. 1 and 5, the path through which the chilled water flows in the fourth cooling mode is: the chilled water output from the air conditioning terminal 3 includes a ninth path and a tenth path, and the ninth path is: chilled water at the air conditioner tail end 3 is output to the pre-cooling coil 4, and after the pre-cooling coil 4 carries out heat exchange, the chilled water after cooling is directly returned to the air conditioner tail end 3 so as to provide cold energy for the air conditioner tail end 3. The tenth path is: the chilled water output from the air conditioner terminal 3 enters the pipelines of the pre-cooling coil 4 and the air conditioner terminal 3 inlet through the fourth three-way valve 94, and is mixed with the chilled water output from the pre-cooling coil 4, so as to adjust the temperature of the chilled water entering the air conditioner terminal 3.

Specifically, the glycol solution is added into the chilled water, so that the chilled water can be prevented from freezing below zero, and therefore, the problem that the chilled water freezes under the temperature condition below zero, so that the pre-cooling coil 4 freezes and cracks is solved, and the cooling tower can still normally run under the temperature condition below zero in winter.

When the environment dry bulb temperature is less than or equal to the second preset temperature and is greater than the third preset temperature, the refrigeration host 1, the plate heat exchanger 5 and the cooling pump 7 are closed, the fan 24 and the freezing pump 8 are opened, and the step of opening the third refrigeration mode further comprises:

measuring the water temperature at the point A; when the water temperature at the point A is lower than the preset water temperature, the refrigerating pump 8 arranged at one end of the second water tank 63 is closed, so that the refrigerated water output from the air conditioner tail end 3 is mixed with the refrigerated water cooled by the precooling coil 4 to neutralize the water temperature of the cooled refrigerated water until the water temperature at the point A is not lower than the preset water temperature; when the water temperature at the point A is higher than the preset water temperature, adjusting the motor frequency of the fan 24, and increasing the air volume of the fan 24 until the water temperature at the point A is equal to the preset water temperature; when the water temperature at the point A is equal to the preset water temperature, the chilled water output by the pre-cooling coil 4 is output to the tail end 3 of the air conditioner, and the water temperature at the point A is the water inlet temperature of the tail end 3 of the air conditioner.

Specifically, the preset water temperature is 22 ℃, because the outlet air temperature of the air conditioning system of the machine room is required to be 23 ℃, and the air conditioning system can better save energy by setting the temperature to 22 ℃.

When the ambient dry bulb temperature is less than or equal to the third preset temperature, only the freezing pump 8 is started, a certain amount of glycol solution is added into the frozen water at the tail end 3 of the air conditioner, and the step of starting the fourth refrigeration mode further comprises the following steps:

obtaining a preset glycol concentration according to the environment dry bulb temperature and the pipeline water capacity of an air conditioning system;

detecting the concentration of glycol in the chilled water at the tail end 3 of the air conditioner by using a concentration detection instrument;

when the concentration of the glycol in the frozen water is less than the preset glycol solubility, adding a pure glycol solution until the concentration of the glycol in the frozen water is not less than the preset glycol solubility;

when the concentration of the glycol in the frozen water is greater than the preset glycol solubility, adding clear water into the frozen water until the concentration of the glycol in the frozen water is equal to the preset glycol solubility;

when the concentration of the glycol in the chilled water is equal to the preset glycol solubility, only the freezing pump 8 arranged between the air conditioner tail end 3 and the pre-cooling coil 4 is turned on, and the chilled water output by the air conditioner tail end 3 exchanges heat on the pre-cooling coil 4 to cool the chilled water.

When the concentration of the ethylene glycol in the freezing water equals to preset ethylene glycol solubility, only open the freezing pump 8 that sets up between the terminal 3 of air conditioner and precooling coil 4, the freezing water of the terminal 3 output of air conditioner carries out the heat transfer at precooling coil 4 to the step of cooling freezing water still includes:

measuring the temperature of the cooled chilled water;

when the temperature of the chilled water is lower than the preset temperature, the opening of the fourth three-way valve 94 is adjusted to increase the volume of the chilled water output from the air conditioner terminal 3 to the chilled water output from the pre-cooling coil 4 until the temperature of the chilled water is not lower than the preset temperature, and then the chilled water is delivered to the air conditioner terminal 3.

Specifically, in this embodiment, the predetermined glycol solubility is 50%,

the above is only the preferred embodiment of the present invention, not so limiting the patent scope of the present invention, all of which are in the utility model discloses a conceive, utilize the equivalent structure transform that the content of the specification and the attached drawings did, or directly/indirectly use all to include in other relevant technical fields the patent protection scope of the present invention.

Claims

1. An air conditioning system, comprising:

the refrigeration host comprises a condenser and an evaporator;

in a fourth refrigeration mode, the pre-cooling coil is used for cooling the chilled water output by the air conditioner terminal, and the chilled water output by the air conditioner terminal is also used for mixing with the cooled chilled water so as to improve the temperature of the cooled chilled water.

2. The air conditioning system of claim 1, wherein the first cooling assembly includes a first spray device, a first filler, a first water tank, and a fan, the first spray device is disposed above the first filler, the first water tank is disposed below the first filler, the fan is disposed above the first spray device, the first spray device is connected to the condenser, the plate heat exchanger includes a first inlet, a first outlet, a second inlet, and a second outlet, the first spray device is connected to the first outlet of the plate heat exchanger, one end of the first water tank is connected to the first inlet, one end of the first water tank is further connected to the first spray device, the other end of the first water tank is connected to the pre-cooling coil, the first outlet is further connected to the condenser, the second inlet is connected to the air conditioning terminal, and the second outlet is connected to the evaporator.

3. The air conditioning system of claim 2, further comprising a second cooling assembly, wherein the second cooling assembly comprises a second spray device, a second filler, and a second water tank, wherein the second spray device is disposed above the second filler, the second filler is disposed beside the pre-cooling coil, the second water tank is disposed below the second filler, and the second water tank is connected to the second spray device.

4. The air conditioning system of claim 3, further comprising at least one of:

the number of the cooling pumps is multiple, one of the cooling pumps is arranged at one end of the first water tank to provide power for the cooling water of the first water tank to be input into the first spraying device, the plate heat exchanger and the condenser, and the other cooling pump is arranged at the other end of the first water tank to provide power for the cooling water of the first water tank to be input into the pre-cooling coil and the evaporator; and

5. The air conditioning system of claim 4, further comprising a valve body including a first three-way valve, a second three-way valve, a third three-way valve, a fourth three-way valve, a fifth three-way valve, a sixth three-way valve, a seventh three-way valve, and an eighth three-way valve, the first three-way valve disposed between the evaporator and the air conditioning terminal, the second three-way valve disposed between the second outlet and the evaporator, the first three-way valve connected to the second three-way valve, the third three-way valve disposed between the second inlet and the air conditioning terminal, the fourth three-way valve disposed between the second inlet and the air conditioning terminal, the fifth three-way valve disposed between the second outlet and the evaporator, and the fourth three-way valve connected to the fifth three-way valve, the sixth three-way valve disposed between the first water tank and the pre-cooling coil, the seventh three-way valve disposed between the second outlet and the evaporator, and the sixth three-way valve connected to the seventh three-way valve, and the eighth three-way valve disposed between the pre-cooling coil and the first spray device.

6. The air conditioning system as claimed in claim 5, further comprising a controller connected to the main cooling unit, the first cooling module, the plate heat exchanger, the cooling pump, the freezing pump and the valve body, respectively, wherein the controller is configured to detect an ambient dry bulb temperature and control operation states of the main cooling unit, the first cooling module, the plate heat exchanger, the cooling pump, the freezing pump and the valve body according to the ambient dry bulb temperature, so as to control the air conditioning system to switch among the first cooling mode, the second cooling mode, the third cooling mode and the fourth cooling mode.