Air conditioning system with natural cooling function

Abstract

The utility model relates to air conditioning refrigeration technical field, especially a kind of air conditioning system with natural cold function. Including air conditioning unit, wherein, still including natural cold heat exchanger and several parallelly connected cooling towers;The cold water inlet of air conditioning unit and the cold water inlet of natural cold heat exchanger are connected with cold water pump respectively;The cooling water inlet of air conditioning unit and the cooling water inlet of natural cold heat exchanger are connected with cooling water pump respectively;Electric three-way valve is equipped on the connecting pipeline of the cooling water outlet of air conditioning unit, the cooling water outlet of natural cold heat exchanger and the cooling water inlet of cooling tower, and the cooling water outlet of cooling tower is connected with the cooling water inlet of air conditioning unit, the cooling water inlet of natural cold heat exchanger in parallel connection respectively.It can select air conditioning unit refrigeration or natural cold heat exchanger refrigeration according to ambient temperature, when using natural cold heat exchanger refrigeration, air conditioning unit is in closed state, high efficiency energy saving is realized.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning and refrigeration technology, and in particular to an air conditioning system with natural cooling function. Background Technology

[0002] Existing air conditioning systems keep the air conditioning unit on in both summer and winter. These systems lack the ability to cool through natural heat exchange. Even when the ambient temperature is lower than the required cooling temperature, the air conditioning unit remains on, resulting in significant energy waste. Utility Model Content

[0003] The purpose of this utility model is to overcome the above-mentioned defects in the existing technology and propose an air conditioning system with natural cooling function. It can select between air conditioning unit cooling or natural cooling heat exchanger cooling according to the ambient temperature. When using natural cooling heat exchanger cooling, the air conditioning unit is in the off state, thus achieving high efficiency and energy saving.

[0004] The technical solution of this utility model is: an air conditioning system with natural cooling function, including an air conditioning unit, which further includes a natural cooling heat exchanger and several cooling towers connected in parallel; The chilled water inlet of the air conditioning unit and the chilled water inlet of the natural cooling heat exchanger are respectively connected to the chilled water pump; The cooling water inlet of the air conditioning unit and the cooling water inlet of the natural cooling heat exchanger are respectively connected to the cooling water pump; An electric three-way valve is installed on the connecting pipes of the cooling water outlet of the air conditioning unit, the cooling water outlet of the natural cooling heat exchanger and the cooling water inlet of the cooling tower. The cooling water outlet of the cooling tower is connected in parallel with the cooling water inlet of the air conditioning unit and the cooling water inlet of the natural cooling heat exchanger.

[0005] In this utility model, the inlet of the electric three-way valve is connected in parallel with the cooling water outlet of the air conditioning unit and the cooling water outlet of the natural cooling heat exchanger; the first outlet of the electric three-way valve is connected in parallel with the cooling water inlet of the air conditioning unit and the cooling water inlet of the natural cooling heat exchanger; and the second outlet of the electric three-way valve is connected to the cooling tower. The electric three-way valve is connected in parallel to the cooling water inlet of each cooling tower, and electric valves are installed on the connecting pipelines. The outlets of each cooling tower are connected and merged to a cooling water pump. An electric valve is installed on the connection pipeline to the cooling water pump.

[0006] The air conditioning unit is equipped with an eighth electric valve at the cold water inlet and a ninth electric valve at the cold water outlet. The natural cooling heat exchanger is equipped with an eleventh electric valve at the cold water inlet. The cold water outlet of the natural cooling heat exchanger is connected to the cold water outlet pipeline of the air conditioning unit through the cold water outflow pipeline. The cold water outflow pipeline is equipped with a tenth electric valve. The cooling water pump and the cooling water inlet of the air conditioning unit are connected by a sixth electric valve and a seventh electric valve in sequence, and the cooling water pump and the cooling water inlet of the natural cooling heat exchanger are connected by a fifth electric valve. A fourth electric valve is installed on the connecting pipe between the cooling water outlet of the natural cooling heat exchanger and the electric three-way valve.

[0007] When the ambient temperature is higher than the chilled water temperature, the air conditioning unit operates and the natural cooling heat exchanger shuts down. At this time, the fourth, fifth, tenth, and eleventh electric valves are in the closed state, while the sixth, seventh, eighth, and ninth electric valves are in the open state.

[0008] When the ambient temperature is lower than the chilled water temperature, the air conditioning unit shuts down and the natural cooling heat exchanger operates. At this time, the fourth, fifth, tenth, and eleventh electric valves are in the open state, while the sixth, seventh, eighth, and ninth electric valves are in the closed state.

[0009] It also includes a cooling tower containing antifreeze, and an auxiliary natural cooling heat exchanger connected to the cooling tower; A second electric three-way valve is installed on the connecting pipeline that connects the chilled water pump, the natural heat exchanger, and the air conditioning unit in parallel. The inlet of the second electric three-way valve is connected to the chilled water pump, the first outlet of the second electric three-way valve is connected to the chilled water inlet of the auxiliary natural heat exchanger, and the second outlet of the second electric three-way valve is connected in parallel to the chilled water inlet of the first natural heat exchanger and the chilled water inlet of the air conditioning unit.

[0010] The chilled water outlet of the auxiliary natural cooling heat exchanger is connected to the chilled water outlet pipeline of the air conditioning unit, and a tenth solenoid valve is installed on the connecting pipeline. The cooling water outlet of the auxiliary natural cooling heat exchanger is connected to the cooling water inlet of the cooling tower containing antifreeze, and a twelfth electric valve is installed on the connecting pipe; the cooling water outlet of the cooling tower containing antifreeze is connected to the cooling water inlet of the auxiliary natural cooling heat exchanger, and a thirteenth electric valve and a second cooling water pump are installed in sequence on the connecting pipe.

[0011] When the ambient temperature is below 0℃, the air conditioning unit, cooling tower, and natural cooling heat exchanger are shut down, while the cooling tower containing antifreeze and the auxiliary natural cooling heat exchanger are in operation. The electric valves and cooling water pumps connected to the air conditioning unit, cooling tower, and natural cooling heat exchanger are all in the closed state, while the twelfth electric valve, the thirteenth electric valve, the second cooling water pump, and the tenth solenoid valve are in the open state.

[0012] The air conditioning unit, natural cooling heat exchanger, chilled water pump, chilled water pump, and auxiliary natural cooling heat exchanger are all installed inside the box. The box and the components inside the box form the first skid section. The second skid section includes a cooling tower located on the outside of the housing; The first and second pry bar sections are fixedly connected by a frame.

[0013] The enclosure also houses a main control cabinet, which is connected to the air conditioning unit, natural cooling heat exchanger, auxiliary natural cooling heat exchanger, cooling tower, water pump, electric valve, electric three-way valve, and second electric three-way valve.

[0014] The beneficial effects of this utility model are: (1) By setting up a natural cooling heat exchanger, when the ambient temperature is lower than the chilled water temperature, the air conditioning unit can be directly shut down. The cooling water and the chilled water from the user end exchange heat in the natural cooling heat exchanger to reduce the temperature of the chilled water. After the cooling water absorbs heat, it flows into the cooling tower and the cooling tower dissipates the heat of the cooling water into the air. At this time, the energy consumption required for the operation of the air conditioning unit is greatly reduced. (2) When the ambient temperature is below zero, in order to prevent the coolant in the cooling tower from freezing, the cooling tower containing antifreeze and the auxiliary natural cooling heat exchanger connected to the cooling tower are used to achieve cooling by utilizing the lowered natural environment outside, while effectively preventing the antifreeze from freezing and ensuring the normal cooling operation of the entire air conditioning system. (3) The air conditioning system with natural cooling function can be a conventional computer room system or an integrated air conditioning system. In this case, the cooling tower constitutes the second skid part, and the air conditioning unit, natural cooling heat exchanger, cold water pump, cooling water pump and solenoid valve and other components installed in the box constitute the first skid part. The first skid part and the second skid part are installed according to the reserved space. After the first skid part and the second skid part are fixedly connected, they can be put into use. There is no need to carry out complicated installation procedures on site, which greatly reduces the construction period and installation cost of on site. (4) Through the main control cabinet, the air conditioning unit, chilled water pump, cooling water pump, natural cooling heat exchanger and cooling tower in the air conditioning system are controlled as a whole, so that the system is always in a state of high efficiency and energy saving. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention in Embodiment 1; Figure 2 This is a schematic diagram of the structure of the present invention in Embodiment 2; In the diagram: 1. Air conditioning unit; 2. First natural cooling heat exchanger; 3. Cooling water pump; 4. Cold water pump; 5. First cooling tower; 6. Second cooling tower; 7. Electric three-way valve; 8. First electric valve; 9. Second electric valve; 10. Third electric valve; 11. Fourth electric valve; 12. Fifth electric valve; 13. Sixth electric valve; 14. Seventh electric valve; 15. Eighth electric valve; 16. Ninth electric valve; 17. Tenth electric valve; 18. Eleventh electric valve; 19. Second cooling water pump; 20. Twelfth electric valve; 21. Thirteenth electric valve; 22. Third cooling tower; 23. Second natural cooling heat exchanger; 25. Housing; 26. Cold water outlet pipeline; 28. Second electric three-way valve. Detailed Implementation

[0016] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0017] Specific details are set forth in the following description to provide a full understanding of the present invention. However, the present invention can be implemented in many ways other than those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0018] Example 1 like Figure 1 As shown, the air conditioning system with natural cooling function described in this utility model includes an air conditioning unit 1, a natural cooling heat exchanger, and several cooling towers. In this embodiment, it includes one natural cooling heat exchanger, namely the first natural cooling heat exchanger 2; and two cooling towers, namely the first cooling tower 5 and the second cooling tower 6, which are arranged in parallel.

[0019] In this embodiment, the air conditioning unit 1 can adopt existing air conditioning unit structures, including centrifugal chillers, lithium bromide chillers, and screw chillers. The operating state of the air conditioning unit is adjusted according to the actual operating conditions: when the unit operates at 100% load, or rarely operates at partial load, fixed frequency is preferred; when the unit frequently operates at partial load, variable frequency is preferred to achieve energy saving. The natural cooling heat exchanger 2 can adopt commonly used plate heat exchangers, shell-and-tube heat exchangers, etc. The first cooling tower 5 and the second cooling tower 6 can be open cooling towers or closed cooling towers, with variable frequency being preferred.

[0020] The air conditioning unit 1 is equipped with a chilled water inlet, a chilled water outlet, a cooling water inlet, and a cooling water outlet. The first natural cooling heat exchanger 2 is also equipped with a chilled water inlet, a chilled water outlet, a cooling water inlet, and a cooling water outlet. A chilled water pump 4 is installed at the chilled water inlet of the air conditioning unit 1 and the chilled water inlet of the first natural cooling heat exchanger 2. The chilled water pump 4 can ensure the circulation of chilled water within the air conditioning system.

[0021] When the air conditioning unit 1 or the first natural cooling heat exchanger 2 supplies chilled water to the user end, the cooling function of the air conditioning system is realized. At this time, the chilled water is circulated between the air conditioning unit 1 and the user end, or between the first natural cooling heat exchanger 2 and the user end, through the chilled water pump 4. The chilled water produced by the air conditioning unit 1 or the first natural cooling heat exchanger 2 is delivered to the user end, and the chilled water that has been heated at the user end is delivered back to the air conditioning unit 1 or the first natural cooling heat exchanger 2 for cooling.

[0022] A cooling water pump 3 is installed at the cooling water inlet of the air conditioning unit 1 and the cooling water inlet of the first natural cooling heat exchanger 2. The cooling water pump 3 provides sufficient power for the circulation of cooling water within the air conditioning system.

[0023] During the cooling process of the air conditioning unit 1 or the first natural cooling heat exchanger 2, the first cooling tower 5 and the second cooling tower 6 are used to discharge the heat inside the air conditioning unit to the atmosphere. The cooling water pump 3 enables the circulation of cooling water between the air conditioning unit 1 and the cooling towers, or between the second natural cooling heat exchanger 2 and the cooling towers. During the cooling water circulation, the cooling water absorbs heat from the cold water inside the air conditioning unit or the second natural cooling heat exchanger, cooling the water, and then flows into the cooling towers via the cooling water pump 3. The first cooling tower 5 and the second cooling tower 6 absorb the heat from the cooling water and discharge the absorbed heat to the atmosphere; the cooled water then flows back into the air conditioning unit 1 or the natural cooling heat exchanger 2 via the cooling water pump 3.

[0024] In this application, the air conditioning unit 1, the first natural cooling heat exchanger 2, the chilled water pump 4, and the cooling water pump 3 are all housed within the casing 25, forming the first skid section, which meets the waterproof requirements of the air conditioning unit 1, the first natural cooling heat exchanger 2, the chilled water pump 4, and the cooling water pump 3. The first skid section is an integral structure.

[0025] The first cooling tower 5 and the second cooling tower 6, connected in parallel, form the second skid section. The second skid section can also be a one-piece structure.

[0026] The first skid portion and the second skid portion are fixedly connected by a frame, forming the integrated air conditioning system of this application. The second skid portion is arranged and fixedly connected along the length direction of the first skid portion.

[0027] In this application, the location of the second skid is not limited to the length direction described in this embodiment; it can also be located at other positions of the first skid, depending on the space reserved during the installation of the air conditioning system. In actual installation, the position of the first skid containing the air conditioning unit is first fixed, and then the location of the second skid is determined based on the size of the reserved space.

[0028] The enclosure 25 also houses a main control cabinet, which is connected to the air conditioning unit 1, chilled water pump 4, cooling water pump 3, first cooling tower 5, and second cooling tower 6. During operation, the main control cabinet can monitor the operating status of chilled water pump 4 and cooling water pump 3, and control the speed of air conditioning unit 1, as well as the number of opening and closing operations of the first and second cooling towers 5 and 6, according to cooling requirements. It can also control and adjust the opening and closing of each electric valve and the opening degree of the electric three-way valve within the system. Through the main control cabinet, automated control of the air conditioning system is achieved, ensuring that air conditioning unit 1 is always in a highly efficient and energy-saving state.

[0029] In this embodiment, the main control cabinet is connected to the chilled water pump 4 via a chilled water pump signal line to monitor whether the chilled water pump 4 is working properly and to control the operation of the chilled water pump 4. The main control cabinet is also connected to the cooling water pump 3 via a cooling water pump signal line to monitor whether the cooling water pump 3 is working properly and to control the operation of the cooling water pump. The main control cabinet is further connected to the first cooling tower 5 and the second cooling tower 6 via cooling tower signal lines to detect whether the cooling towers are working properly and to control the operation of the first cooling tower 5 and the second cooling tower 6, that is, to control the number of cooling towers actually participating in the cooling work.

[0030] Specifically, in this embodiment, an eighth electric valve 15 is provided at the cold water inlet of the air conditioning unit 1, and a ninth electric valve 16 is provided at the cold water outlet of the air conditioning unit 1.

[0031] The natural heat exchanger 2 is equipped with an eleventh electric valve 18 at its chilled water inlet. The chilled water outlet of the natural heat exchanger 2 is connected to the chilled water outlet pipeline of the air conditioning unit 1 via a chilled water outlet pipeline 26, on which a tenth electric valve 17 is installed. The chilled water pump 4 is located upstream of the eighth electric valve 15 and the eleventh electric valve 18 to facilitate pumping chilled water into the air conditioning system 1 or the natural heat exchanger 2.

[0032] The cooling water outlet of the air conditioning unit 1 and the cooling water outlet of the natural heat exchanger 2 are respectively connected to the inlet of the electric three-way valve 7. A fourth electric valve 11 is installed on the connecting pipeline between the cooling water outlet of the natural heat exchanger 2 and the inlet of the electric three-way valve 7.

[0033] The first outlet of the electric three-way valve 7 is connected to the cooling tower. The first outlet of the electric three-way valve 7 is connected in parallel to both cooling towers. A second electric valve 9 is installed on the connecting pipe between the first outlet of the electric three-way valve 7 and the cooling water inlet of the first cooling tower 5, and a third electric valve 10 is installed on the connecting pipe between the first outlet of the electric three-way valve 7 and the cooling water inlet of the second cooling tower 6. The cooling water outlets of the first cooling tower 5 and the second cooling tower 6 merge, and a first electric valve 8 is installed on the connecting pipe after the merging.

[0034] The second outlet of the electric three-way valve 7 is connected in parallel to the cooling water inlet of the air conditioning unit 1 and the cooling water inlet of the natural heat exchanger 2. A sixth electric valve 13 and a seventh electric valve 14 are sequentially installed on the connecting pipe between the second outlet of the electric three-way valve 7 and the cooling water inlet of the air conditioning unit 1. A fifth electric valve 12 is installed on the connecting pipe between the second outlet of the electric three-way valve 7 and the cooling water inlet of the natural heat exchanger 2. A cooling water pump 3 is installed upstream of the sixth electric valve 13 and the fifth electric valve 12, enabling the cooling water to circulate between the cooling tower and the air conditioning unit, or between the cooling tower and the natural heat exchanger.

[0035] When air conditioning unit 1 is used for cooling, the air conditioning unit 1 is operated. At this time, the fourth electric valve 11, the fifth electric valve 12, the tenth electric valve 17 and the eleventh electric valve 18 are closed, and the first electric valve 8, the second electric valve 9, the third electric valve 10, the sixth electric valve 13, the seventh electric valve 14, the eighth electric valve 15 and the ninth electric valve 16 are open.

[0036] At this time, the chilled water from the user end enters the air conditioning unit through the eighth electric valve 15 and the chilled water inlet of the air conditioning unit 1. The evaporator side of the air conditioning unit 1 produces chilled water, and the produced chilled water flows back to the user end through the chilled water outlet of the air conditioning unit 1 and the ninth electric valve 16.

[0037] When air conditioning unit 1 uses electric refrigeration, the refrigerant absorbs heat from the chilled water through evaporation, lowering the chilled water temperature to the required temperature. When air conditioning unit 1 is a lithium bromide unit, the refrigerant water absorbs heat from the chilled water through evaporation, lowering the chilled water temperature to the required temperature. Powered by chilled water pump 4, the chilled water is delivered to the user end, absorbs heat, and then returns to air conditioning unit 1 via chilled water pump 4, repeating the cycle continuously for cooling.

[0038] The cooling water in air conditioning unit 1 is used to remove the heat absorbed by the unit and the heat input during operation, ensuring continuous operation. For electrically refrigerated air conditioning units, the cooling water mainly absorbs heat from the condenser side; when the air conditioning unit uses a lithium bromide unit, the cooling water absorbs and removes heat from both the condenser and absorber. The actual number of cooling towers in operation is adjusted according to the load of air conditioning unit 1. When the load of air conditioning unit 1 is high, in this embodiment, both the first cooling tower 5 and the second cooling tower 6 participate in the cooling process, at which time the second electric valve 9 and the third electric valve 10 are both open.

[0039] When the cooling water is at a low temperature, there is no need for a cooling tower to cool it. At this time, the inlet of the electric three-way valve is connected to the second outlet, while the first outlet is closed. Under the action of the cooling water pump 3, the cooling water flowing out of the air conditioning unit 1 is recirculated back into the air conditioning unit, ensuring that the air conditioning unit 1 can start and operate normally.

[0040] As the cooling water temperature rises, the inlet of the electric three-way valve 7 connects with the first outlet, while the second outlet remains closed. The cooling water flowing out of the air conditioning unit 1 enters the first cooling tower 5 and the second cooling tower 6 respectively. The cooling water flowing out of the air conditioning unit 1, after absorbing heat, is pumped to the first cooling tower 5 and the second cooling tower 6 by the cooling water pump 3. The cooling towers absorb the heat from the cooling water, and the cooled water circulates back to the air conditioning unit 1 through the cooling water pump 3.

[0041] In this application, when the load of the air conditioning unit 1 decreases, the load is adjusted by reducing the speed of the air conditioning unit 1, the on and off status of the cooling water pump 3, or the number of cooling towers involved in the actual operation, so as to find the optimal adjustment method and make the air conditioning unit 1 more efficient and energy-saving.

[0042] When the ambient temperature is lower than the chilled water temperature, the cooling demand can be met by utilizing the natural cooling of the first natural cooling heat exchanger 2. At this time, the air conditioning unit 1 is turned off, and the first natural cooling heat exchanger 2 is running. At this time, the fourth electric valve 11, the fifth electric valve 12, the tenth electric valve 17, the eleventh electric valve 18, the first electric valve 8, the second electric valve 9, and the third electric valve 10 are open, while the sixth electric valve 13, the seventh electric valve 14, the eighth electric valve 15, and the ninth electric valve 16 are closed.

[0043] At this time, the cold water from the user end flows into the first natural cooling heat exchanger 2 through the eleventh electric valve 18. The cold water exchanges heat with the cooling water in the first natural cooling heat exchanger 2, and the cooling water cools the cold water. The produced cold water, under the power of the cold water pump 4, flows back to the user end through the cold water outlet pipeline 26 and the tenth electric valve 17.

[0044] The cooling water in the first natural cooling heat exchanger 2 carries away the heat absorbed from the cold water, and the heated cooling water flows into the cooling tower for cooling. The number of cooling towers that are turned on is mainly determined by the water supply temperature of the air conditioning terminal. In this embodiment, both the first cooling tower 5 and the second cooling tower 6 are in the on state.

[0045] As the cooling water temperature rises, the inlet of the electric three-way valve 7 connects with the first outlet, while the second outlet remains closed. The cooling water flowing out of the first natural cooling heat exchanger 2 enters the first cooling tower 5 and the second cooling tower 6 respectively. The cooling water that has absorbed heat flowing out of the first natural cooling heat exchanger 2 is pumped to the first cooling tower 5 and the second cooling tower 6 by the cooling water pump 3. The cooling towers absorb the heat from the cooling water, and the cooled water circulates back to the first natural cooling heat exchanger 2 by the cooling water pump 3.

[0046] For cooling towers in areas where the minimum temperature will not reach the point where the cooling water freezes, open-type towers can be used; for other areas, closed-type towers are recommended, and antifreeze such as ethylene glycol should be used for the cooling water to prevent freezing from affecting the normal operation of the system.

[0047] In this application, the enclosure 25 is also equipped with an inspection door and a main power distribution cabinet. The inspection door is located on the side wall of the enclosure 25, and the maintenance and inspection of the equipment inside the enclosure can be realized through the inspection door.

[0048] In this application, when the ambient temperature is higher than the chilled water temperature, the air conditioning unit 1 operates and cools; when the ambient temperature is lower than the chilled water temperature, the air conditioning unit 1 stops working, the first natural cooling heat exchanger 2 is turned on, and at the same time, the electric valve in the system switches accordingly, so that the system switches to natural cooling heat exchanger cooling.

[0049] Example 2 like Figure 2 As shown, unlike Embodiment 1, this embodiment includes two natural cooling heat exchangers inside the housing 25: a first natural cooling heat exchanger 2 and a second natural cooling heat exchanger 23. Correspondingly, a third cooling tower 22 is added to the second skid section. The coolant in the first cooling tower 5 and the second cooling tower 6 is water, which absorbs heat from the cooling water to achieve cooling. The coolant in the third cooling tower 22 is water and ethylene glycol, with the ethylene glycol acting as an antifreeze.

[0050] Cold water from the user end flows into the system through a cold water inlet pipeline. A second electrically operated three-way valve 28 is installed on this pipeline. The inlet of the second electrically operated three-way valve 28 is connected to the outlet of the cold water pump. The first outlet of the second electrically operated three-way valve 28 is connected to the cold water inlet of the second natural cooling heat exchanger 23, and the second outlet of the second electrically operated three-way valve 28 is connected to the cold water inlet of the first natural cooling heat exchanger 2 or the cold water inlet of the air conditioning unit 1. The cold water outlet of the second natural cooling heat exchanger 23 is connected to the cold water outlet pipeline of the air conditioning unit, and a tenth electrically operated valve is installed on this connecting pipeline.

[0051] The cooling water outlet of the second natural cooling heat exchanger 23 is connected to the cooling water inlet of the third cooling tower 22 via a connecting pipe, which is equipped with a twelfth electric valve 20. The cooling water outlet of the third cooling tower 22 is connected to the cooling water inlet of the second natural cooling heat exchanger 23 via a connecting pipe, which is equipped with a thirteenth electric valve 21 and a second cooling water pump 19. The second cooling water pump 19 enables the circulation of cooling water between the second natural cooling heat exchanger 23 and the third cooling tower 22.

[0052] When the ambient temperature is above 0℃, the coolant (water) inside the cooling tower will not freeze, and the system can then achieve cooling operation through the air conditioning unit 1 and the first natural cooling heat exchanger 2. When the ambient temperature is higher than the chilled water temperature, the air conditioning unit 1 operates, and the first natural cooling heat exchanger 2 shuts off, achieving cooling through the air conditioning unit 1. When the ambient temperature is lower than the chilled water temperature, the air conditioning unit shuts off, and the first natural cooling heat exchanger 2 opens, allowing the chilled water and cooling water to exchange heat in the first natural cooling heat exchanger 2, thus cooling the chilled water.

[0053] When the ambient temperature is below 0℃, the coolant (water) in the cooling tower is prone to freezing. At this time, both the air conditioning unit 1 and the first natural cooling heat exchanger 2 are in the closed state, and the electric three-way valve 7, the first electric valve 8, the second electric valve 9, the third electric valve 10, the fourth electric valve 11, the fifth electric valve 12, the sixth electric valve 13, the seventh electric valve 14, the eighth electric valve 15, the ninth electric valve 16, and the eleventh electric valve 18 are all in the closed state. At the same time, the second natural cooling heat exchanger 23 is in the working state, and the second cooling water pump 19, the twelfth electric valve 20, and the thirteenth electric valve 21 are all in the open state.

[0054] At this time, cold water from the user end enters the second natural cooling heat exchanger 23 directly through the second electric three-way valve 28. The cold water and cooling water exchange heat directly in the second natural cooling heat exchanger 23, with the cooling water absorbing the heat from the cold water to achieve cooling. Powered by the second cooling water pump 19, the cooling water circulates to the third cooling tower 22 for further cooling. Through the circulating cooling water, continuous cooling of the cold water is achieved.

[0055] The cold water flowing out of the second natural cooling heat exchanger 23 is returned to the user end through the tenth electric valve 17 under the power of the cold water pump 4.

[0056] Because the refrigerant in the third cooling tower 22 contains ethylene glycol, the refrigerant in the third cooling tower 22 will not freeze.

[0057] Everything else is the same as in Example 1.

[0058] The air conditioning system with natural cooling function provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model. The above description of the disclosed embodiments enables those skilled in the art to implement or use this utility model. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of this utility model. Therefore, this utility model is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An air conditioning system with natural cooling function, comprising an air conditioning unit, characterized in that, It also includes natural cooling heat exchangers and several cooling towers connected in parallel; The chilled water inlet of the air conditioning unit and the chilled water inlet of the natural cooling heat exchanger are respectively connected to the chilled water pump; The cooling water inlet of the air conditioning unit and the cooling water inlet of the natural cooling heat exchanger are respectively connected to the cooling water pump; An electric three-way valve is installed on the connecting pipes of the cooling water outlet of the air conditioning unit, the cooling water outlet of the natural cooling heat exchanger and the cooling water inlet of the cooling tower. The cooling water outlet of the cooling tower is connected in parallel with the cooling water inlet of the air conditioning unit and the cooling water inlet of the natural cooling heat exchanger.

2. The air conditioning system with natural cooling function according to claim 1, characterized in that, The inlet of the electric three-way valve is connected in parallel with the cooling water outlet of the air conditioning unit and the cooling water outlet of the natural cooling heat exchanger. The first outlet of the electric three-way valve is connected in parallel with the cooling water inlet of the air conditioning unit and the cooling water inlet of the natural cooling heat exchanger. The second outlet of the electric three-way valve is connected to the cooling tower. The electric three-way valve is connected in parallel to the cooling water inlet of each cooling tower, and electric valves are installed on the connecting pipelines. The outlets of each cooling tower are connected and merged to a cooling water pump. An electric valve is installed on the connection pipeline to the cooling water pump.

3. The air conditioning system with natural cooling function according to claim 1, characterized in that, The air conditioning unit is equipped with an eighth electric valve at the cold water inlet and a ninth electric valve at the cold water outlet. The natural cooling heat exchanger is equipped with an eleventh electric valve at the cold water inlet. The cold water outlet of the natural cooling heat exchanger is connected to the cold water outlet pipeline of the air conditioning unit through the cold water outflow pipeline. The cold water outflow pipeline is equipped with a tenth electric valve. The cooling water pump and the cooling water inlet of the air conditioning unit are connected by a sixth electric valve and a seventh electric valve in sequence, and the cooling water pump and the cooling water inlet of the natural cooling heat exchanger are connected by a fifth electric valve. A fourth electric valve is installed on the connecting pipe between the cooling water outlet of the natural cooling heat exchanger and the electric three-way valve.

4. The air conditioning system with natural cooling function according to claim 3, characterized in that, When the ambient temperature is higher than the chilled water temperature, the air conditioning unit operates and the natural cooling heat exchanger shuts down. At this time, the fourth, fifth, tenth, and eleventh electric valves are in the closed state, while the sixth, seventh, eighth, and ninth electric valves are in the open state.

5. The air conditioning system with natural cooling function according to claim 3, characterized in that, When the ambient temperature is lower than the chilled water temperature, the air conditioning unit shuts down and the natural cooling heat exchanger operates. At this time, the fourth, fifth, tenth, and eleventh electric valves are in the open state, while the sixth, seventh, eighth, and ninth electric valves are in the closed state.

6. The air conditioning system with natural cooling function according to claim 1, characterized in that, It also includes a cooling tower containing antifreeze, and an auxiliary natural cooling heat exchanger connected to the cooling tower; A second electric three-way valve is installed on the connecting pipeline that connects the chilled water pump, the natural heat exchanger, and the air conditioning unit in parallel. The inlet of the second electric three-way valve is connected to the chilled water pump, the first outlet of the second electric three-way valve is connected to the chilled water inlet of the auxiliary natural heat exchanger, and the second outlet of the second electric three-way valve is connected in parallel to the chilled water inlet of the first natural heat exchanger and the chilled water inlet of the air conditioning unit.

7. The air conditioning system with natural cooling function according to claim 1, characterized in that, The chilled water outlet of the auxiliary natural cooling heat exchanger is connected to the chilled water outlet pipeline of the air conditioning unit, and a tenth solenoid valve is installed on the connecting pipeline. The cooling water outlet of the auxiliary natural cooling heat exchanger is connected to the cooling water inlet of the cooling tower containing antifreeze, and a twelfth electric valve is installed on the connecting pipe; the cooling water outlet of the cooling tower containing antifreeze is connected to the cooling water inlet of the auxiliary natural cooling heat exchanger, and a thirteenth electric valve and a second cooling water pump are installed in sequence on the connecting pipe.

8. The air conditioning system with natural cooling function according to claim 7, characterized in that, When the ambient temperature is below 0℃, the air conditioning unit, cooling tower, and natural cooling heat exchanger are shut down, while the cooling tower containing antifreeze and the auxiliary natural cooling heat exchanger are in operation. The electric valves and cooling water pumps connected to the air conditioning unit, cooling tower, and natural cooling heat exchanger are all in the closed state, while the twelfth electric valve, the thirteenth electric valve, the second cooling water pump, and the tenth solenoid valve are in the open state.

9. The air conditioning system with natural cooling function according to claim 6, characterized in that, The air conditioning unit, natural cooling heat exchanger, chilled water pump, cooling water pump, and auxiliary natural cooling heat exchanger are all installed inside the box. The box and the components inside the box form the first skid section. The second skid section includes a cooling tower located on the outside of the housing; The first and second pry bar sections are fixedly connected by a frame.

10. The air conditioning system with natural cooling function according to claim 9, characterized in that, The enclosure also houses a main control cabinet, which is connected to the air conditioning unit, natural cooling heat exchanger, auxiliary natural cooling heat exchanger, cooling tower, water pump, electric valve, electric three-way valve, and second electric three-way valve.

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