Air conditioning system

Abstract

The utility model provides an air conditioning system which comprises a fresh air handling unit, a medium temperature cooler and a cooling tower, the fresh air handling unit comprises a pretreatment section used for precooling or preheating fresh air, a three-medium heat exchanger is arranged in the pretreatment section, and the three-medium heat exchanger is provided with a first water flow channel, a second water flow channel and an air flow channel. The medium-temperature cooler is connected with the first water flow channel, and the cooling tower is connected with the second water flow channel; the precooling function section and the preheating function section of the fresh air handling unit are integrated into the integrated three-medium pretreatment section, and meanwhile, the fresh air handling unit is communicated with the cooling water system and the chilled water system, so that a composite energy system of three media including chilled water, cooling water and air is formed; in transition seasons, fresh air is pre-cooled through double cold sources of low-temperature cooling water and medium-temperature chilled water, natural cold sources are utilized in the transition seasons, and therefore the problems that in the transition seasons, the system stability is low, and in the transition seasons, energy consumption of a medium-temperature host is high are effectively solved.

Description

Technical Field

[0001] The utility model belongs to the field of air conditioners, and more specifically, relates to an air conditioning system. Background Art

[0002] Semiconductor clean workshop air conditioners are characterized by high load, many parameters, and long operation time, and have high requirements for HVAC design. The construction investment of high-level semiconductor workshops is extremely expensive, and at the same time, they consume a huge amount of energy. Therefore, energy conservation and reduction of the HVAC system cost of semiconductor workshops are urgent needs in HVAC design.

[0003] At present, a fresh air handling unit (MAU) is used to pre-treat outdoor fresh air. Conventional fresh air handling units are large in volume and high in energy consumption. For example, the patent with the publication number CN212481546U discloses an industrial heat exchange system. The heat exchange system includes a workshop, a cooling water tower unit, a MAU preheating coil unit, at least two heat exchange units, and each unit and the workshop are connected by pipelines. The pipeline is filled with a heat exchange medium. Among them, after the heat exchange medium is heated through heat exchange in the first heat exchange unit, it enters the MAU preheating coil unit, and the cold air is preheated through the MAU preheating coil unit. The MAU preheating coil unit is connected to the MAU fresh air conditioner to adjust the air conditioner temperature. The output pipeline of the MAU preheating coil unit is connected to the second heat exchange unit, and exchanges heat with the cooling water in the cooling water tower unit to cool down, and finally enters the first heat exchange unit to provide heat exchange medium for the first heat exchange unit. This existing solution realizes the purpose of energy conservation by not turning on or turning on less ice machines and boilers in winter. However, the number of heat exchange units in the heat exchange system is large, and the problem of high energy consumption in the transitional season is not considered. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an air conditioning system to solve the problem of high energy consumption of the air conditioning system in the transitional season in the existing technology.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is:

[0006] The utility model provides an air conditioning system, including:

[0007] A fresh air handling unit, the fresh air handling unit includes a pre-treatment section for pre-cooling or pre-heating fresh air. A three-medium heat exchanger is arranged in the pre-treatment section. The three-medium heat exchanger has a first water flow channel, a second water flow channel, and an air flow channel;

[0008] An intermediate temperature chiller, the intermediate temperature chiller is connected to the first water flow channel, and the intermediate temperature chiller is used to provide chilled water to the three-medium heat exchanger;

[0009] A cooling tower, which is connected to the second water flow channel and is used to supply cooling water to the three-medium heat exchanger.

[0010] Further, the medium-temperature chiller is connected to the first water flow channel through a first connecting pipe, and a chilled water control valve for controlling the water flow rate is arranged on the first connecting pipe.

[0011] Further, the chilled water control valve adopts an electric butterfly valve for chilled water.

[0012] Further, the cooling tower is connected to the second water flow channel through a second connecting pipe, and a cooling water control valve for controlling the water flow rate is arranged on the second connecting pipe.

[0013] Further, the cooling water control valve adopts an electric butterfly valve for cooling water.

[0014] Further, a hot water supply pipe, which is connected to the second connecting pipe and is located between the first water flow channel and the cooling water control valve.

[0015] Further, a temperature sensor is also arranged in the pretreatment section. The temperature sensor is located beside the three-medium heat exchanger and is used to detect the temperature of the fresh air after being pretreated by the three-medium heat exchanger.

[0016] Further, the fresh air unit further includes at least one of a humidifying section, a dehumidifying section, and a reheating section. The humidifying section is used to humidify the fresh air after being pretreated by the three-medium heat exchanger, the dehumidifying section is used to dehumidify the fresh air after being pretreated by the three-medium heat exchanger, and the reheating section is used to reheat the fresh air after being pretreated by the three-medium heat exchanger.

[0017] Further, the cooling tower is connected to the medium-temperature chiller through a cooling water branch pipe.

[0018] Further, it also includes: a dry cooling coil, and the medium-temperature chiller is connected to the dry cooling coil through a chilled water branch pipe.

[0019] Compared with the prior art, the beneficial effects of the air-conditioning system provided by the present utility model are as follows: The present utility model optimizes the structure of the fresh air handling unit. By arranging a three-medium heat exchanger in the pretreatment section of the fresh air handling unit, the pre-cooling function section and the pre-heating function section of the fresh air handling unit are integrated into an integrated three-medium pretreatment section, reducing the pretreatment space of the unit, reducing the internal resistance of the unit, lightening the burden on the unit fan, and achieving the purpose of saving energy consumption. At the same time, the three-medium heat exchanger is connected to the cooling water system and the chilled water system to form a composite energy system of three media: chilled water, cooling water, and air. In the transitional season, the fresh air is pre-cooled by the double cold sources of low-temperature cooling water and medium-temperature chilled water, that is, the natural cold source is utilized in the transitional season, solving the problems of low system stability in the transitional season and high energy consumption of the medium-temperature main engine in the transitional season. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 It is a schematic structural diagram of the air-conditioning system provided by the present utility model;

[0022] Figure 2 It is a schematic structural diagram of the three-medium heat exchanger provided by the present utility model;

[0023] Figure 3 It is a schematic structural diagram of the air-conditioning system provided by the present utility model in the summer cooling mode;

[0024] Figure 4 It is a schematic structural diagram of the air-conditioning system provided by the present utility model in the winter heating mode;

[0025] Figure 5 It is a schematic structural diagram of the air-conditioning system provided by the present utility model in the transitional season mode;

[0026] Among them, the main marks in each drawing are as follows:

[0027] 1. Fresh air handling unit;

[0028] 11. Pretreatment section; 12. Humidification section; 13. Dehumidification section; 14. Reheating section;

[0029] 112. Three-medium heat exchanger; 1121. First water flow channel; 1122. Second water flow channel; 1123. Air flow channel; 1124. Outer tube; 1125. Inner tube; 1126. Fins;

[0030] 113. Temperature sensor;

[0031] 2. Medium-temperature chiller;

[0032] 21. First connection pipe; 22. Chilled water control valve; 23. Chilled water branch pipe;

[0033] 3. Cooling tower;

[0034] 31. Second connection pipe; 32. Cooling water control valve; 33. Cooling water branch pipe;

[0035] 40. Hot water supply pipe;

[0036] 5. Dry cooling coil;

[0037] 6. Fan filter unit;

[0038] 70. Air supply pipe. Detailed implementation manners

[0039] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0040] The air conditioner in the semiconductor clean workshop has the characteristics of high load, many parameters and long operation time, and has high requirements for HVAC design. The construction investment of high-level semiconductor workshops is very expensive, and at the same time, the energy consumption is huge. Therefore, energy conservation and reduction of the HVAC system cost in semiconductor workshops are urgent needs in HVAC design. At present, a fresh air handling unit is used to pre-treat outdoor fresh air. The conventional fresh air handling unit is large in volume and high in energy consumption. In order to save the investment cost and operation cost, the present utility model optimizes the structure of the fresh air handling unit and at the same time solves the problem of high energy consumption of the air conditioning system in the transitional season.

[0041] Please refer to Figure 1 , Figure 2 , the air conditioning system provided by the present utility model includes:

[0042] A fresh air handling unit 1, the fresh air handling unit 1 includes a pre-treatment section 11 for pre-cooling or pre-heating fresh air. A three-medium heat exchanger 112 is provided in the pre-treatment section 11. The three-medium heat exchanger 112 has a first water flow channel 1121, a second water flow channel 1122 and an air flow channel 1123;

[0043] A medium-temperature chiller 2, the medium-temperature chiller 2 is connected to the first water flow channel 1121, and the medium-temperature chiller 2 is used to supply chilled water to the three-medium heat exchanger 112;

[0044] Cooling tower 3 is connected to the second water flow channel 1122, and the cooling tower 3 is used to supply cooling water to the three-medium heat exchanger 112.

[0045] It should be understood that the three-medium heat exchanger 112 can adopt a finned-tube three-medium heat exchanger. As Figure 2 shown, the finned-tube three-medium heat exchanger includes an outer tube 1124, an inner tube 1125 inserted into the lumen of the outer tube 1124, and fins 1126 combined with the outer wall of the outer tube 1124. Among them, the inner diameter of the inner tube 1125 is smaller than that of the outer tube 1124. The annular gap between the outer wall of the inner tube 1125 and the inner wall of the outer tube 1124 forms the first water flow channel 1121, the lumen of the inner tube 1125 forms the second water flow channel 1122, and the outer wall of the outer tube 1124 and the fins 1126 form the air flow channel 1123. The first water flow channel 1121, the second water flow channel 1122, and the air flow channel 1123 are all medium channels.

[0046] The advantage of such a design is that the structure of the fresh air unit of the present utility model is optimized. By providing a three-medium heat exchanger in the pretreatment section of the fresh air unit, the pre-cooling function section and the pre-heating function section of the fresh air unit 1 are integrated into an integrated three-medium pretreatment section, reducing the pretreatment space of the unit while also reducing the internal resistance of the unit, reducing the burden on the unit fan, and achieving the purpose of saving energy. At the same time, the three-medium heat exchanger is connected to the cooling water system and the chilled water system to form a composite energy system of chilled water, cooling water, and air. In the transitional season, the fresh air is pre-cooled by the dual cold sources of low-temperature cooling water and medium-temperature chilled water, that is, the natural cold source is utilized in the transitional season, solving the problems of low system stability in the transitional season and high energy consumption of the medium-temperature main engine in the transitional season.

[0047] In some embodiments of the present utility model, the medium-temperature chiller 2 is connected to the first water flow channel 1121 through a first connection pipe 21, and a chilled water control valve 22 for controlling the water flow rate is provided on the first connection pipe 21.

[0048] It should be noted that the first connection pipe 21 includes a chilled water supply pipe and a chilled water return pipe connected between the medium-temperature chiller 2 and the three-medium heat exchanger 112 to form a chilled water circulation loop.

[0049] The advantage of such a design is that by controlling the start-stop and opening degree of the chilled water control valve 22, the chilled water flow rate supplied to the three-medium heat exchanger 112 is adjusted, so that the temperature of the fresh air pretreated by the three-medium heat exchanger 112 meets the actual requirements.

[0050] In an alternative embodiment of the present utility model, the chilled water control valve 22 is an electric butterfly valve for chilled water. The electric butterfly valve for chilled water has the advantages of simple structure, convenient operation, good sealing performance, etc. Of course, in other alternative embodiments, the chilled water control valve 22 can also be an electric ball valve for chilled water or an electromagnetic valve for chilled water, etc.

[0051] In some embodiments of the present utility model, the cooling tower 3 is connected to the second water flow channel 1122 through a second connecting pipe 31, and a cooling water control valve 32 for controlling the water flow rate is arranged on the second connecting pipe 31.

[0052] It should be noted that the second connecting pipe 31 includes a cooling water supply pipe and a cooling water return pipe connected between the cooling tower 3 and the three-medium heat exchanger 112 to form a cooling water circulation loop.

[0053] The advantage of such a design is that by controlling the start / stop and opening degree of the cooling water control valve 32, the flow rate of the cooling water supplied to the three-medium heat exchanger 112 is adjusted, so that the temperature of the fresh air pretreated by the three-medium heat exchanger 112 meets the actual requirements.

[0054] In an alternative embodiment of the present utility model, the cooling water control valve 32 is an electric butterfly valve for cooling water. The electric butterfly valve for cooling water has the advantages of simple structure, convenient operation, good sealing performance, etc. Of course, in other alternative embodiments, the electric butterfly valve for cooling water can also be an electric ball valve for cooling water or an electromagnetic valve for cooling water, etc.

[0055] In some embodiments of the present utility model, the air conditioning system further includes a hot water supply pipe 40, and the hot water supply pipe 40 is connected to the second connecting pipe 31 and is located between the first water flow channel 1121 and the cooling water control valve 32.

[0056] It should be understood that the air conditioning system has three working modes, namely the summer cooling mode, the transitional season mode, and the winter heating mode, and the controller is used to control the air conditioning system to switch to the specified working mode. When the air conditioning system is in the summer cooling mode, the chilled water in the medium-temperature chiller 2 is transported to the three-medium heat exchanger 112 through the first connecting pipe 21 to pre-cool the fresh air; when the air conditioning system is in the transitional season mode, the chilled water in the medium-temperature chiller 2 is transported to the three-medium heat exchanger 112 through the first connecting pipe 21, and at the same time, the cooling water in the cooling tower 3 is transported to the three-medium heat exchanger 112 through the second connecting pipe 31 to pre-cool the fresh air; when the air conditioning system is in the winter heating mode, the external hot water is transported to the three-medium heat exchanger 112 through the hot water supply pipe 40 to pre-heat the fresh air.

[0057] The advantage of such a design is that the utility model can pre-cool or pre-heat the fresh air according to summer, winter and transitional seasons respectively, making the indoor environment of the clean workshop more comfortable.

[0058] In some embodiments of the utility model, a temperature sensor 113 is further provided in the pretreatment section 11. The temperature sensor 113 is located beside the three-medium heat exchanger 112 and is used to detect the temperature of the fresh air pretreated by the three-medium heat exchanger 112.

[0059] In practical applications, the flow rate of chilled water and / or cooling water supplied to the three-medium heat exchanger 112 can also be adjusted according to the detected fresh air temperature by the temperature sensor 113 and the set temperature, so that the temperature of the fresh air pretreated by the three-medium heat exchanger 112 meets the actual requirements.

[0060] In some embodiments of the utility model, the fresh air unit 1 further includes at least one of a humidifying section 12, a dehumidifying section 13 and a reheating section 14. The humidifying section 12 is used to humidify the fresh air pretreated by the three-medium heat exchanger 112, the dehumidifying section 13 is used to dehumidify the fresh air pretreated by the three-medium heat exchanger 112, and the reheating section 14 is used to reheat the fresh air pretreated by the three-medium heat exchanger 112.

[0061] The advantage of such a design is that not only the fresh air is pretreated by the three-medium heat exchanger 112, but also the fresh air can be heated, and / or dehumidified, and / or reheated subsequently, so that the fresh air finally sent into the clean workshop indoor meets the set temperature and humidity requirements.

[0062] In some embodiments of the utility model, the cooling tower 3 is connected to the medium-temperature chiller 2 through a cooling water branch pipe 33.

[0063] The advantage of such a design is that the cooling water in the cooling tower 3 is transported to the medium-temperature chiller 2 through the cooling water branch pipe 33. At this time, the cooling tower 3 is also used to provide cooling water for the medium-temperature chiller 2, so as to assist the medium-temperature chiller 2 in heat exchange processing.

[0064] In some embodiments of the utility model, the air conditioning system further includes: a dry cooling coil 5. The medium-temperature chiller 2 is connected to the dry cooling coil 5 through a chilled water branch pipe 23.

[0065] In practical applications, the dry cooling coil 5 can be installed at the bottom of the clean workshop indoor. The dry cooling coil 5 is used to cool down the return air in the clean workshop indoor, thereby eliminating the indoor sensible heat without generating condensate water.

[0066] The advantage of such a design is that the chilled water in the medium-temperature chiller 2 is transported to the dry cooling coil 5 through the chilled water branch pipe 23. At this time, the medium-temperature chiller 2 is also used to supply chilled water to the dry cooling coil 5, thereby assisting the dry cooling coil 5 in performing heat exchange processing.

[0067] In some embodiments of the present invention, the air conditioning system further includes: a plurality of fan filter units 6 (FFU).

[0068] In practical applications, the fan filter unit 6 can be installed on the top of the clean workshop indoor. The fan filter unit 6 combines the functions of a fan and the purification effect of a filter, and can improve the indoor air quality of the clean workshop.

[0069] For ease of understanding, the following will provide a complete description of the air conditioning system provided by the preferred embodiment of the present invention in combination with practical application examples:

[0070] As Figure 1 shown, the air conditioning system provided by the present invention includes: a fresh air handling unit 1, a medium-temperature chiller 2, a cooling tower 3, a dry cooling coil 5, and a plurality of fan filter units 6.

[0071] The fresh air handling unit 1 is used to provide fresh air for the clean workshop. The fresh air handling unit 1 sends the fresh air into the clean workshop indoor through the air supply duct 70. The dry cooling coil 5 is installed at the bottom of the clean workshop indoor, and a plurality of fan filter units 6 are installed at intervals on the top of the clean workshop indoor.

[0072] The fresh air handling unit 1 includes a pretreatment section 11, a humidification section 12, a dehumidification section 13, and a reheating section 14 arranged in sequence from left to right. The pretreatment section 11 is used to pre-cool or pre-heat the fresh air. A three-medium heat exchanger 112 and a temperature sensor 113 are provided in the pretreatment section 11. The humidification section 12 is used to humidify the fresh air. A humidifier is provided in the humidification section 12. The dehumidification section 13 is used to dehumidify the fresh air. A rotary dehumidifier is provided in the dehumidification section 13. The reheating section 14 is used to re-heat the fresh air. An electric heater is provided in the reheating section 14.

[0073] As Figure 2 shown, the three-medium heat exchanger 112 adopts a finned tube type three-medium heat exchanger. The three-medium heat exchanger 112 has a first water flow channel 1121, a second water flow channel 1122, and an air flow channel 1123.

[0074] As Figure 1As shown, the medium-temperature chiller 2 is connected to the first water flow channel 1121 through the first connection pipe 21. A chilled water control valve 22 for controlling the water flow rate is provided on the first connection pipe 21, and the chilled water control valve 22 adopts an electric butterfly valve for chilled water. The cooling tower 3 is connected to the second water flow channel 1122 through the second connection pipe 31. A cooling water control valve 32 for controlling the water flow rate is provided on the second connection pipe 31, and the cooling water control valve 32 adopts an electric butterfly valve for cooling water. The hot water supply pipe 40 is connected to the second connection pipe 31 and is located between the first water flow channel 1121 and the cooling water control valve 32.

[0075] As Figure 1 shown, the cooling tower 3 is connected to the medium-temperature chiller 2 through a cooling water branch pipe 33, and the medium-temperature chiller 2 is connected to the dry cooling coil 5 through a chilled water branch pipe 23. The cooling tower 3 is also connected to the triple-medium heat exchanger 112 through a return pipe.

[0076] In practical applications, the air-conditioning system has three working modes, namely the summer cooling mode, the transitional season mode, and the winter heating mode, and the controller is used to control the air-conditioning system to switch to the specified working mode.

[0077] As Figure 3 shown, when the air-conditioning system is in the summer cooling mode, the chilled water control valve 22 is opened, and the chilled water in the medium-temperature chiller 2 is transported to the triple-medium heat exchanger 112 through the first connection pipe 21 to pre-cool the fresh air and achieve the effect of preliminary temperature reduction. After the fresh air is pre-treated in the pre-treatment section 11, the fresh air is humidified, dehumidified, and re-heated according to actual needs, and then the fresh air is sent into the clean workshop indoor after reaching the set temperature and humidity requirements.

[0078] As Figure 4 shown, when the air-conditioning system is in the winter heating mode, external hot water is transported to the triple-medium heat exchanger 112 through the hot water supply pipe 40 to pre-heat the fresh air and achieve the effect of preliminary heating. After the fresh air is pre-treated in the pre-treatment section 11, the fresh air is humidified, dehumidified, and re-heated according to actual needs, and then the fresh air is sent into the clean workshop indoor after reaching the set temperature and humidity requirements.

[0079] As Figure 5 shown, when the air-conditioning system is in the transitional season mode, the chilled water control valve 22 and the cooling water control valve 32 are opened. The chilled water in the medium-temperature chiller 2 is transported to the triple-medium heat exchanger 112 through the first connection pipe 21, and at the same time, the cooling water in the cooling tower 3 is transported to the triple-medium heat exchanger 112 through the second connection pipe 31 to pre-cool the fresh air and achieve the effect of preliminary temperature reduction. After the fresh air is pre-treated in the pre-treatment section 11, the fresh air is humidified, dehumidified, and re-heated according to actual needs, and then the fresh air is sent into the clean workshop indoor after reaching the set temperature and humidity requirements.

[0080] Preferably, when the air conditioning system is in the transitional season mode, the cooling water control valve 32 is preferentially opened. Under the action of the cooling water pump, the cooling water is transported to the three-medium heat exchanger 112 through the second connecting pipe 31. After exchanging heat with the air and absorbing heat to increase the temperature, the cooling water returns to the cooling tower 3 through the return pipe. Then, the cooling water dissipates heat and cools down, thus forming a cooling water circulation. The chilled water control valve 22 is opened according to the optimal set temperature T1 of the fresh air after pretreatment by the three-medium heat exchanger 112 and the temperature t1 of the fresh air after pretreatment by the three-medium heat exchanger 112 detected by the temperature sensor 113. Specifically, when T1 > t1, the chilled water control valve 22 is opened and the opening degree of the chilled water control valve 22 is gradually increased, while the opening degree of the cooling water control valve 32 is gradually decreased until T1 ≤ t1.

[0081] Compared with the prior art, the beneficial effects of the air conditioning system provided by the present utility model are as follows: After integrating the pre-cooling function section and the pre-heating function section of the fresh air unit into an integrated three-medium pretreatment section, the present utility model reduces the floor space occupied by the air conditioning equipment, reduces the internal resistance of the unit, lightens the burden on the fan, and achieves the purpose of saving energy consumption, thus effectively solving the problems of excessive floor space occupied by the air conditioning equipment and high energy consumption of the air conditioning equipment in the clean workshop. At the same time, the fresh air unit is connected to the chilled water system and the cooling water system to form a composite energy system of chilled water, cooling water, and air. In the transitional season, the fresh air is pre-cooled by the double cold sources of low-temperature cooling water and medium-temperature chilled water, realizing the utilization of natural cold sources in the transitional season, thus effectively solving the problems of low system stability in the transitional season and high energy consumption of the medium-temperature main engine in the transitional season.

[0082] In the description of the present utility model, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0083] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. An air conditioning system, characterized in that, Comprising: A fresh air unit, the fresh air unit includes a pretreatment section for precooling or preheating fresh air, a three-medium heat exchanger is provided in the pretreatment section, and the three-medium heat exchanger has a first water flow channel, a second water flow channel and an air flow channel; A medium-temperature chiller, the medium-temperature chiller is connected to the first water flow channel, and the medium-temperature chiller is used to supply chilled water to the three-medium heat exchanger; A cooling tower, the cooling tower is connected to the second water flow channel, and the cooling tower is used to supply cooling water to the three-medium heat exchanger.

2. The air conditioning system according to claim 1, characterized in that, The medium-temperature chiller is connected to the first water flow channel through a first connecting pipe, and a chilled water control valve for controlling the water flow rate is provided on the first connecting pipe.

3. The air conditioning system according to claim 2, characterized in that, The chilled water control valve adopts an electric butterfly valve for chilled water.

4. The air-conditioning system according to claim 1, characterized in that, The cooling tower is connected to the second water flow channel through a second connecting pipe, and a cooling water control valve for controlling the water flow rate is provided on the second connecting pipe.

5. The air conditioning system according to claim 4, wherein The cooling water control valve adopts an electric butterfly valve for cooling water.

6. The air conditioning system according to claim 4, characterized in that, Further comprising: A hot water supply pipe, the hot water supply pipe is connected to the second connecting pipe and is located between the first water flow channel and the cooling water control valve.

7. The air conditioning system according to claim 1, characterized in that, A temperature sensor is further provided in the pretreatment section, the temperature sensor is located beside the three-medium heat exchanger, and the temperature sensor is used to detect the temperature of the fresh air pretreated by the three-medium heat exchanger.

8. The air conditioning system according to claim 1, characterized in that, The fresh air unit further includes at least one of a humidification section, a dehumidification section and a reheating section, the humidification section is used to humidify the fresh air pretreated by the three-medium heat exchanger, the dehumidification section is used to dehumidify the fresh air pretreated by the three-medium heat exchanger, and the reheating section is used to reheat the fresh air pretreated by the three-medium heat exchanger.

9. The air-conditioning system according to claim 1, characterized in that, The cooling tower is connected to the medium-temperature chiller through a cooling water branch pipe.

10. The air conditioning system according to claim 1, wherein Further comprising: A dry cooling coil, the medium-temperature chiller is connected to the dry cooling coil through a chilled water branch pipe.

Images