Air conditioning system and control method thereof

Abstract

The invention relates to an air conditioning system and a control method thereof. The air conditioning system comprises a clean workshop; the output end of the fresh air handling unit is connected with the clean workshop; the return air adjusting assembly comprises a medium-temperature water chilling unit, a standby host and a three-medium heat exchanger, and the first output end of the medium-temperature water chilling unit is connected with the first input end of the three-medium heat exchanger; the refrigerant output end of the standby host is connected with the second input end of the three-medium heat exchanger, and the standby host has a refrigerating mode and a heating mode; the first temperature detection device is used for detecting the temperature of the clean workshop; when the air conditioning system is in the transition season operation state, if the starting number of the heat loads in the clean workshop is lower than the preset number, and the temperature of the clean workshop is lower than the target temperature, the medium-temperature water chilling unit is controlled to be in a closed state, and the standby host is controlled to be in a heating mode, so that the temperature of the clean workshop is rapidly adjusted; too low temperature of the clean workshop is avoided, and the system reliability is improved.

Description

Technical Field

[0001] The present application relates to the technical field of air-conditioning systems, and in particular to an air-conditioning system and a control method thereof. Background Art

[0002] Purification air conditioning system is mainly used in electronic clean workshops with high cleanliness requirements (class 1000 or above), or in some special occasions. For example, in a large-scale class 10,000 workshop with very low floors, if a single return air conditioning system (Air handling unit, AHU) is used, the system air volume is large and the return air duct is too large to be used. You can consider using a purification air conditioning system (MAU+DCC+FFU system) to reduce the air conditioning system pipelines, and at the same time, the temperature and humidity are independently processed, which can effectively reduce the system's operating energy consumption.

[0003] At present, the existing purification air conditioning system generally includes a make-up air unit (MAU), a dry coil (DCC) system and a fan filter unit (FFU). The coil heat exchanger in the dry coil (DCC) system is cooled by a medium-temperature chiller, and the cold water in the coil heat exchanger exchanges heat with the air to send cold air to the clean room. When the number of startups of the heat load of the clean room is small, the indoor temperature of the clean room is very likely to be too low, especially when operating in the transition season, the temperature of the outdoor fresh air sent to the clean room is low, and the medium-temperature chiller can only cool. Since there is not enough sensible heat in the room to offset the cold air, even if the cold water supply of the medium-temperature chiller is reduced or even the dry coil (DCC) system is closed, the indoor temperature cannot be raised to the target temperature, resulting in an increase in the product defect rate and causing greater economic losses. Summary of the invention

[0004] The present application provides an air-conditioning system and a control method thereof to solve the technical problem that the existing purification air-conditioning system does not have enough sensible heat in the room to offset the cold air. Even if the cold water supply of the medium-temperature chiller is reduced or even the dry coil system is shut down, the indoor temperature cannot be raised to the target temperature, resulting in an increase in the product defective rate and causing great economic losses.

[0005] In a first aspect, the present application provides an air conditioning system, comprising:

[0006] Clean workshop;

[0007] The fresh air unit, whose output end is connected to the clean room, is used to transport outdoor fresh air;

[0008] A return air conditioning assembly includes a medium-temperature chiller, a standby host, and a three-medium heat exchanger, wherein a first output end of the medium-temperature chiller is connected to a first input end of the three-medium heat exchanger; a refrigerant output end of the standby host is connected to a second input end of the three-medium heat exchanger, and the standby host has a cooling mode and a heating mode; and

[0009] The first temperature detection device is used to detect the temperature of the clean room;

[0010] Among them, when the air-conditioning system is in transition season operation, if the number of heat loads in the clean room is lower than the preset number and the temperature of the clean room is lower than the target temperature, the medium-temperature chiller is controlled to be in the off state and the standby host is controlled to be in heating mode.

[0011] In one possible implementation, the return air conditioning assembly includes a first pipeline and a first control valve, the first end of the first pipeline is connected to the refrigerant output end of the standby host, the second end of the first pipeline is connected to the second input end of the three-medium heat exchanger, and the first control valve is arranged on the first pipeline.

[0012] In one possible implementation, the return air conditioning assembly includes a second pipeline and a second control valve, the first end of the second pipeline is connected to the second output end of the three-medium heat exchanger, the second end of the second pipeline is connected to the first input end of the medium-temperature chiller, and the second control valve is arranged on the second pipeline.

[0013] In one possible implementation, the clean workshop includes a return air duct, the first end of the return air duct is connected to the air outlet of the fresh air unit through the fresh air duct, the first end of the return air duct is connected to the air outlet of the three-medium heat exchanger, and the second end of the return air duct is connected to the air supply outlet of the clean workshop.

[0014] In one possible implementation, the clean room includes a top interlayer, which is provided with a fan filter unit, the air inlet of the fan filter unit is connected to the second end of the return air channel, and the air outlet of the fan filter unit is connected to the air supply outlet of the clean room.

[0015] In a possible implementation, the fresh air unit includes a precooling section, a preheating section, a humidification section, a dehumidification section and a reheating section connected in sequence to pre-treat the outdoor fresh air passing through the air inlet of the fresh air unit.

[0016] In a possible implementation, the return air conditioning component includes a cooling tower, an input end of the cooling tower is connected to the second output end of the medium-temperature chiller, and an output end of the cooling tower is connected to the second input end of the medium-temperature chiller.

[0017] In a second aspect, the present application provides a control method for an air conditioning system, which is applied to the air conditioning system as described above, and the control method includes:

[0018] Obtain the operating conditions of the air conditioning system, the number of units powered on for heat loads in the clean room, and the temperature of the clean room;

[0019] When the air-conditioning system is in transition season operation, if the number of heat loads in the clean room is lower than the preset number and the temperature of the clean room is lower than the target temperature, the medium-temperature chiller is controlled to be in the off state and the standby host is controlled to be in heating mode.

[0020] In a possible implementation, the return air conditioning component of the air conditioning system includes a first pipeline and a first control valve, the first end of the first pipeline is connected to the refrigerant output end of the standby host, the second end of the first pipeline is connected to the second input end of the three-medium heat exchanger, the first control valve is arranged on the first pipeline, and the control method includes:

[0021] After the standby host is controlled to be in the heating mode, if the temperature of the clean room is lower than the target temperature after a first period of time, the opening of the first control valve is controlled to increase until the temperature of the clean room is equal to the target temperature.

[0022] In a possible implementation, it includes:

[0023] Get the operating status of the medium temperature chiller;

[0024] When the air conditioning system is in summer operation, if the medium-temperature chiller fails, the medium-temperature chiller is controlled to be in a closed state, and the standby host is controlled to be in cooling mode.

[0025] In one possible implementation, the return air conditioning component includes a second pipeline and a second control valve, the first end of the second pipeline is connected to the second output end of the three-medium heat exchanger, the second end of the second pipeline is connected to the first input end of the medium-temperature chiller, and the second control valve is arranged on the second pipeline. The control method includes: when the air-conditioning system is in summer operation, if the medium-temperature chiller operates normally and the temperature of the clean room is higher than the target temperature, the opening of the second control valve is controlled to increase.

[0026] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0027] The air-conditioning system and control method thereof provided in the embodiment of the present application are as follows: when the air-conditioning system is operated in the transition season, the outdoor ambient temperature is low, that is, the temperature of the outdoor fresh air is lower than that in summer, then the number of heat loads in the clean room is monitored, where the heat loads mainly include lighting equipment and production equipment. If the number of heat loads turned on is lower than the preset number, and the temperature of the clean room is lower than the target temperature, it means that there is not enough sensible heat in the room to offset the low-temperature outdoor fresh air, resulting in the temperature of the clean room being lower than the target temperature. At this time, the medium-temperature chiller is controlled to be in the off state, and the standby host is in the heating mode. The medium-temperature chiller is shut down and no longer provides chilled water to the three-medium heat exchanger. The high-temperature refrigerant output by the standby host is transported to the three-medium heat exchanger. The high-temperature refrigerant in the three-medium heat exchanger is fully exchanged with the return air of the clean room by heat conduction and heat convection, thereby obtaining hot air. The hot air is mixed with the low-temperature outdoor fresh air in the return air channel to obtain medium-temperature mixed air. The medium-temperature mixed air enters the clean room to quickly adjust the temperature of the clean room, so that the temperature of the clean room is quickly raised to the target temperature. Since the output air volume of the three-medium heat exchanger is much larger than the air volume of the fresh air unit, the temperature of the clean room can be adjusted more quickly to prevent the temperature of the clean room from being too low, thereby improving the temperature and humidity stability of the clean room, and preventing the quality of the product from being affected by low temperature, thereby improving the yield of the product and avoiding economic losses due to unstable temperature. At the same time, the reliability of the air-conditioning system is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0030] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0031] Figure 1 A schematic diagram of the structure of an air conditioning system provided in an embodiment of the present application;

[0032] Figure 2 A schematic diagram of the structure of a heat pump system provided in an embodiment of the present application;

[0033] Figure 3 for Figure 2 The working principle diagram of the heat pump system, in which the hollow arrows show the flow direction of the refrigerant in the cooling mode, and the solid arrows show the flow direction of the refrigerant in the heating mode;

[0034] Figure 4 A flow chart of a control method for an air conditioning system provided in an embodiment of the present application;

[0035] Figure 5 A flowchart of a method for controlling an air-conditioning system provided in accordance with another embodiment of the present application.

[0036] Description of reference numerals:

[0037] 100. Air conditioning system;

[0038] 1. Clean room; 11. Return air channel; 12. Top interlayer; 2. Fresh air unit; 21. Precooling section; 22. Preheating section; 23. Humidification section; 24. Dehumidification section; 25. Reheating section; 26. Fresh air channel; 3. Return air adjustment component; 31. Medium temperature chiller; 32. Standby host; 33. Three-medium heat exchanger; 34. Cooling tower; 35. First pipeline; 36. First control valve; 37. Second pipeline; 38. Second control valve; 39. Water pump; 4. Fan filter unit;

[0039] 200. Purification air conditioning system;

[0040] 201. Combined fresh air unit; 202. Dry coil system; 202a. Coil heat exchanger; 202b. Medium temperature chiller; 202c. Cooling tower; 203. Fan filter unit. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0042] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0043] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a change in posture or a change in motion state, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0044] Currently, if Figure 1 As shown, the existing purification air conditioning system 200 generally includes a combined fresh air unit 201 (Make-up Air Unit, MAU), a dry coil system 202 (Dry Cooling Coil, DCC) and a fan filter unit 203 (FanFilter Unit, FFU). The dry coil system 202 includes a coil heat exchanger 202a, a medium-temperature chiller 202b and a cooling tower 202c. The coil heat exchanger 202a is connected to the medium-temperature chiller 202b, and the medium-temperature chiller 202b is connected to the cooling tower 202c. The cold water in the coil heat exchanger 202a exchanges heat with the air to obtain cold air. The cold air is mixed with the outdoor fresh air in the return air channel and then filtered by the fan filter unit 203 before entering the clean workshop. When the number of clean room heat loads turned on is small, the indoor temperature of the clean room is very likely to be too low, especially when operating in transition seasons. The temperature of the outdoor fresh air sent into the clean room is low, and the medium-temperature chiller 202b can only cool. Since there is not enough sensible heat in the room to offset the cold air, even if the cold water supply of the medium-temperature chiller 202b is reduced or even the dry coil system is shut down, the indoor temperature cannot be quickly raised to the target temperature. The indoor temperature and humidity stability is low, resulting in an increase in the product defect rate and causing greater economic losses.

[0045] In order to solve the technical problem that when the existing purification air-conditioning system is operated in the transition season, there is not enough sensible heat in the room to offset the cold air. Even if the cold water supply of the medium-temperature chiller is reduced or even the dry coil system is shut down, the indoor temperature cannot be quickly raised to the target temperature, and the indoor temperature and humidity stability is low, resulting in an increase in the product defective rate and causing great economic losses, the present application provides an air-conditioning system and a control method thereof, which can use a standby host and a three-medium heat exchanger to quickly adjust the temperature of the clean room to avoid the temperature of the clean room being too low, thereby improving the temperature and humidity stability of the clean room, and can prevent the quality of the product from being affected by low temperature, thereby improving the yield of the product, avoiding economic losses due to unstable temperature, and improving the reliability of the air-conditioning system.

[0046] like Figure 2 As shown, the present application provides an air-conditioning system 100, including a clean workshop 1, a fresh air unit 2, a return air conditioning component 3 and a first temperature detection device, the output end of the fresh air unit 2 is connected to the clean workshop 1 for conveying outdoor fresh air; the return air conditioning component 3 includes a medium-temperature chiller 31, a standby host 32 and a three-medium heat exchanger 33, the first output end of the medium-temperature chiller 31 is connected to the first input end of the three-medium heat exchanger 33, the first input end of the medium-temperature chiller 31 is connected to the first output end of the three-medium heat exchanger 33, so as to provide low-temperature chilled water to the three-medium heat exchanger 33; the refrigerant output end of the standby host 32 is connected to the second input end of the three-medium heat exchanger 33, the refrigerant input end of the standby host 32 is connected to the second output end of the three-medium heat exchanger 33, and the standby host 32 has a cooling mode and a heating mode to provide high-temperature refrigerant or low-temperature refrigerant to the three-medium heat exchanger 33; the first temperature detection device is used to detect the temperature of the clean workshop 1. Among them, when the air-conditioning system 100 is operating in the transition season, if the number of powered-on units of the heat load in the clean workshop 1 is lower than the preset number, and the temperature of the clean workshop 1 is lower than the target temperature, the medium-temperature chiller 31 is controlled to be in the closed state, and the standby host 32 is controlled to be in the heating mode.

[0047] It is understandable that when the air-conditioning system 100 is running in the transition season, the outdoor ambient temperature is low, that is, the temperature of the outdoor fresh air is lower than that in summer, and the number of thermal loads in the clean room 1 is monitored. Here, the thermal load mainly includes lighting equipment and production equipment. If the number of thermal loads turned on is lower than the preset number, and the temperature of the clean room 1 is lower than the target temperature, it means that there is not enough sensible heat in the room to offset the low-temperature outdoor fresh air, resulting in the temperature of the clean room 1 being lower than the target temperature. At this time, the medium-temperature chiller 31 is controlled to be in the off state, and the standby main The machine 32 is in heating mode, the medium-temperature chiller 31 is shut down, and no longer provides chilled water to the three-medium heat exchanger 33. The high-temperature refrigerant output by the standby host 32 is transported to the three-medium heat exchanger 33. The high-temperature refrigerant in the three-medium heat exchanger 33 and the return air of the clean room 1 are fully exchanged by heat conduction and heat convection, thereby obtaining hot air. The hot air is mixed with the low-temperature outdoor fresh air in the return air channel 11 to obtain medium-temperature mixed air. The medium-temperature mixed air enters the clean room 1 to quickly adjust the temperature of the clean room 1, so that the temperature of the clean room 1 is quickly raised to the target temperature. Since the output air volume of the three-medium heat exchanger 33 is much larger than the air volume of the fresh air unit 2, the temperature of the clean room 1 can be adjusted more quickly to avoid the temperature of the clean room 1 being too low, thereby improving the temperature and humidity stability of the clean room 1, and preventing the product quality from being affected by low temperature, thereby improving the product yield, avoiding economic losses caused by unstable temperature, and improving the reliability of the air conditioning system.

[0048] Optionally, in the cooling mode, the refrigerant output end of the standby host 32 can deliver a low-temperature refrigerant of 12°C; in the cooling mode, the refrigerant output end of the standby host 32 can deliver a high-temperature refrigerant of 35°C.

[0049] It should be noted that if only the temperature of the clean workshop 1 is monitored, when the temperature of the clean workshop 1 is lower than the target temperature, the outlet air temperature of the three-medium heat exchanger 33 can be adjusted by reducing the chilled water supply of the medium-temperature chiller 31, thereby adjusting the temperature of the clean workshop 1. Therefore, it is necessary to monitor the number of heat load startups and the temperature of the clean workshop 1 at the same time to indicate that the sensible heat of the clean workshop 1 is too low. Simply lowering or shutting down the medium-temperature chiller 31 cannot quickly increase the temperature of the clean workshop 1, resulting in the temperature stability of the clean workshop 1 being affected.

[0050] When the air conditioning system 100 is running in summer, if the medium temperature chiller 31 operates normally, the first output end of the medium temperature chiller 31 provides low temperature chilled water to the three-medium heat exchanger 33, and the chilled water in the three-medium heat exchanger 33 is fully heat-exchanged with the return air of the clean workshop 1 by heat conduction and heat convection, thereby obtaining cold air, and the cold air is mixed with the outdoor fresh air delivered by the fresh air unit 2 in the return air channel 11 to obtain low temperature mixed air, and the low temperature mixed air is sent to the clean workshop 1 to offset the sensible heat of the heat load in the clean workshop 1, so that the indoor temperature of the clean workshop 1 reaches the target temperature. It should be noted that the three-medium heat exchanger 33 may include a dry coil, and the dry coil controls the indoor temperature by eliminating the sensible heat generated by the heat load in the clean workshop 1 (such as the heat generated by lighting equipment, production equipment, etc.), and generally does not generate condensed water. The working principle of the dry coil is to condense the water vapor in the air through the low temperature coil surface, thereby achieving dehumidification, which can well adjust the humidity of the clean workshop 1, and at the same time, because the coil surface does not directly contact the water, it is called a dry coil. The dry coil air supply temperature cannot be lower than the dew point temperature of the clean room 1, otherwise condensation water will be generated, resulting in too low humidity in the clean room 1. Optionally, the first output end of the medium temperature chiller 31 can output low temperature chilled water at 12°C.

[0051] When the air conditioning system 100 is running in summer, if the medium-temperature chiller 31 fails, the medium-temperature chiller 31 is controlled to be in a closed state, and the standby host 32 is controlled to be in a cooling mode. The standby host 32 provides low-temperature refrigerant to the three-medium heat exchanger 33. The low-temperature refrigerant of the three-medium heat exchanger 33 fully exchanges heat with the return air of the clean workshop 1 and outputs cold air. The cold air is mixed with the outdoor fresh air delivered by the fresh air unit 2 in the return air channel 11 to obtain low-temperature mixed air. The low-temperature mixed air is sent to the clean workshop 1 to offset the sensible heat of the heat load in the clean workshop 1, so that the indoor temperature of the clean workshop 1 reaches the target temperature. Compared with the prior art, when the medium-temperature chiller 31 fails, the cooling mode is turned on by the standby host 32, and the return air with a large air volume can fully exchange heat with the low-temperature refrigerant, thereby controlling the stability of the indoor temperature and humidity and ensuring the reliability of the air conditioning system 100.

[0052] In some embodiments, the return air conditioning assembly 3 includes a first pipeline 35 and a first control valve 36, the first end of the first pipeline 35 is connected to the refrigerant output end of the standby host 32, the second end of the first pipeline 35 is connected to the second input end of the three-medium heat exchanger 33, and the first control valve 36 is arranged on the first pipeline 35. After the standby host 32 is controlled to be in the heating mode, if the temperature of the clean room 1 is still lower than the target temperature after the first time period, the opening of the first control valve 36 is controlled to increase, so that more high-temperature refrigerant enters the three-medium heat exchanger 33 from the first pipeline 35, and the high-temperature refrigerant in the three-medium heat exchanger 33 exchanges heat with the air through heat conduction and heat convection to obtain more hot air, and the hot air is mixed with the outdoor fresh air in the return air channel 11 to obtain medium-temperature mixed air, and the medium-temperature mixed air enters the clean room 1, so that the temperature of the clean room 1 is quickly raised to the target temperature, until the temperature of the clean room 1 reaches the target temperature, and the current opening of the first control valve 36 is maintained.

[0053] In some embodiments, the return air conditioning assembly 3 includes a second pipeline 37 and a second control valve 38, the first end of the second pipeline 37 is connected to the second output end of the three-medium heat exchanger 33, the second end of the second pipeline 37 is connected to the first input end of the medium-temperature chiller 31, and the second control valve 38 is arranged on the second pipeline 37. When the air conditioning system 100 is in summer operation, if the medium-temperature chiller 31 operates normally and the temperature of the clean room 1 is higher than the target temperature, the opening of the second control valve 38 is controlled to increase, thereby increasing the flow rate of the low-temperature chilled water entering the three-medium heat exchanger 33, improving the heat exchange efficiency between the return air and the low-temperature chilled water of the clean room 1, and then reducing the mixed air temperature, so that the temperature of the clean room 1 is reduced to the target temperature.

[0054] Furthermore, a water pump 39 is provided on the second pipeline 37 , and normal transportation of chilled water can be achieved through the water pump 39 .

[0055] In some embodiments, the clean workshop 1 also includes a return air duct 11, the first end of the return air duct 11 is connected to the air outlet of the fresh air unit 2 through the fresh air duct 26, the first end of the return air duct 11 is connected to the air outlet of the three-medium heat exchanger 33, the second end of the return air duct 11 is connected to the air supply outlet of the clean workshop 1, and the air inlet of the three-medium heat exchanger 33 is connected to the return air outlet of the clean workshop 1.

[0056] It can be understood that when the air-conditioning system 100 operates normally in summer, the first output end of the medium-temperature chiller 31 provides chilled water to the three-medium heat exchanger 33. The chilled water in the three-medium heat exchanger 33 exchanges heat with the air to obtain cold air. The outdoor fresh air is pre-treated by the fresh air unit 2 and then enters the return air channel 11 through the fresh air channel 26. The cold air and the outdoor fresh air are mixed at the first end of the return air channel 11 to obtain low-temperature mixed air. The low-temperature mixed air enters the clean workshop 1, thereby offsetting the sensible heat of the heat load in the clean workshop 1, so that the indoor temperature of the clean workshop 1 reaches the target temperature. When operating in the transition season, if the heat load quantity is lower than the preset quantity and the temperature of the clean workshop 1 is lower than the target temperature, the standby host 32 starts the heating mode, and the standby host 32 provides high-temperature refrigerant to the three-medium heat exchanger 33. The high-temperature refrigerant in the three-medium heat exchanger 33 exchanges heat with the air to obtain hot air. The outdoor fresh air is pre-treated by the fresh air unit 2 and enters the return air channel 11 through the fresh air channel 26. The hot air is mixed with the outdoor fresh air at the first end of the return air channel 11 to obtain mixed warm air. The mixed warm air is filtered by the fan filter unit 4 and enters the clean workshop 1 from the air supply port of the clean workshop 1, thereby quickly adjusting the temperature of the clean workshop 1 so that the temperature of the clean workshop 1 reaches the target temperature.

[0057] Furthermore, the clean room 1 further comprises a top interlayer 12, and a fan filter unit 4 is provided on the top interlayer 12, the air inlet of the fan filter unit 4 is connected to the second end of the return air channel 11, and the air outlet of the fan filter unit 4 is connected to the air supply port of the clean room 1. The fan filter unit 4 may comprise a high efficiency filter or an ultra-high efficiency filter, a micro fan and a housing, and the low-temperature mixed air or the medium-temperature mixed air enters the top interlayer 12 from the return air channel 11, and the mixed air is filtered by the fan filter unit 4 to obtain clean mixed air, and the clean mixed air enters the clean room 1 from the air supply port of the clean room 1, which can effectively ensure that the temperature and humidity of the clean room 1 are kept stable, and can prevent the quality of the product from being affected by the low temperature, thereby improving the yield of the product.

[0058] In some embodiments, the fresh air unit 2 may include a precooling section 21, a preheating section 22, a humidification section 23, a dehumidification section 24 and a reheating section 25 connected in sequence to pre-treat the outdoor fresh air passing through the air inlet of the fresh air unit 2. Specifically, the precooling section 21 is provided with a precooling device, which can precool the outdoor fresh air to reduce the temperature of the outdoor fresh air; the preheating section 22 is provided with a first heating device, which can preheat the outdoor fresh air to increase the temperature of the outdoor fresh air; the humidifying section 23 is provided with a humidifying device, which can humidify the outdoor fresh air to increase the humidity of the outdoor fresh air. After the outdoor fresh air is mixed with the cold air or hot air output by the three-medium heat exchanger 33, the humidity of the clean workshop 1 can be adjusted to ensure that the humidity of the clean workshop 1 reaches the target humidity; the dehumidification section 24 is provided with a dehumidification device, which can dehumidify the outdoor fresh air to reduce the humidity of the outdoor fresh air. After the outdoor fresh air is mixed with the cold air or hot air output by the three-medium heat exchanger 33, the humidity of the clean workshop 1 can be adjusted to ensure that the humidity of the clean workshop 1 reaches the target humidity; the reheating section 25 is provided with a second heating device, which can reheat the outdoor fresh air to increase the temperature of the outdoor fresh air.

[0059] This embodiment can be combined with the above-mentioned embodiments to obtain more embodiments. In one example, during summer operation, after the standby host 32 is controlled to be in heating mode, if the first control valve 36 reaches the maximum opening, and the temperature of the clean room 1 is still lower than the target temperature, the preheating section 22 is controlled to be in an open state to increase the temperature of the outdoor fresh air, thereby increasing the mixed air temperature; if after the second period of time, the temperature of the clean room 1 is still lower than the target temperature, then the reheating section 25 is controlled to be in an open state to further increase the temperature of the outdoor fresh air. In another example, during summer operation, if the second control valve 38 reaches the maximum opening, and the temperature of the clean room 1 is still higher than the target temperature, the precooling section 21 is controlled to be in an open state to reduce the temperature of the outdoor fresh air, thereby adjusting the temperature of the clean room 1.

[0060] In some embodiments, the return air conditioning assembly 3 includes a cooling tower 34, the input end of the cooling tower 34 is connected to the second output end of the medium-temperature chiller 31, and the output end of the cooling tower 34 is connected to the second input end of the medium-temperature chiller 31. When the medium-temperature chiller 31 operates normally, the medium-temperature chiller 31 provides low-temperature chilled water to the three-medium heat exchanger 33 through the second pipeline 37, and the heated chilled water enters the cooling tower 34 to dissipate heat and cool down, and the cooled cooling water is then transported to the three-medium heat exchanger 33 to realize the circulation of chilled water.

[0061] Figure 3 A control method of an air conditioning system 100 provided in an embodiment of the present application is applied to the above air conditioning system 100. The control method includes:

[0062] S11, obtaining the operating condition of the air conditioning system 100, the number of started-up units of the heat load in the clean room 1, and the temperature of the clean room 1;

[0063] S12. When the air-conditioning system 100 is in transition season operation, if the number of units with heat load in the clean room 1 that are turned on is lower than a preset number and the temperature of the clean room 1 is lower than the target temperature, the medium-temperature chiller 31 is controlled to be in a closed state, and the standby host 32 is controlled to be in heating mode.

[0064] When the air conditioning system 100 is running in the transition season, the outdoor ambient temperature is low, that is, the temperature of the outdoor fresh air is lower than that in summer, so the number of thermal loads in the clean room 1 is monitored. Here, the thermal load mainly includes lighting equipment and production equipment. If the number of thermal loads turned on is lower than the preset number, and the temperature of the clean room 1 is lower than the target temperature, it means that there is not enough sensible heat in the room to offset the low-temperature outdoor fresh air, resulting in the temperature of the clean room 1 being lower than the target temperature. At this time, the medium-temperature chiller 31 is controlled to be in the off state, and the standby host 32 is in the off state. In the heating mode, the medium-temperature chiller 31 is shut down and no longer provides chilled water to the three-medium heat exchanger 33. The high-temperature refrigerant output by the standby host 32 is transported to the three-medium heat exchanger 33. The high-temperature refrigerant in the three-medium heat exchanger 33 and the return air of the clean room 1 are fully exchanged by heat conduction and heat convection to obtain hot air. The hot air is mixed with the low-temperature outdoor fresh air in the return air channel 11 to obtain medium-temperature mixed air. The medium-temperature mixed air enters the clean room 1 to quickly adjust the temperature of the clean room 1 and quickly raise the temperature of the clean room 1 to the target temperature. Through the above control strategy, since the output air volume of the three-medium heat exchanger 33 is much larger than the air volume of the fresh air unit 2, the temperature of the clean room 1 can be adjusted more quickly to avoid the temperature of the clean room 1 being too low, thereby improving the temperature and humidity stability of the clean room 1, and avoiding the product quality being affected by low temperature, thereby improving the product yield, avoiding economic losses caused by unstable temperature, and improving the reliability of the air conditioning system.

[0065] In one embodiment, Figure 4 As shown, the return air conditioning assembly 3 of the air conditioning system 100 includes a first pipeline 35 and a first control valve 36. The first end of the first pipeline 35 is connected to the refrigerant output end of the standby host 32, and the second end of the first pipeline 35 is connected to the second input end of the three-medium heat exchanger 33. The first control valve 36 is arranged on the first pipeline 35. The control method includes the following steps:

[0066] S13, after controlling the standby host 32 to be in the heating mode, if the temperature of the clean room 1 is lower than the target temperature after a first period of time, the opening of the first control valve 36 is controlled to increase until the temperature of the clean room 1 is equal to the target temperature.

[0067] Through the above control strategy, more high-temperature refrigerant enters the three-medium heat exchanger 33 from the first pipeline 35, and the high-temperature refrigerant in the three-medium heat exchanger 33 exchanges heat with the air through heat conduction and heat convection to obtain more hot air. The hot air is mixed with outdoor fresh air in the return air channel 11 to obtain medium-temperature mixed air. The medium-temperature mixed air enters the clean workshop 1, so that the temperature of the clean workshop 1 is quickly increased to the target temperature, until the temperature of the clean workshop 1 reaches the target temperature, and the current opening of the first control valve 36 is maintained.

[0068] In one embodiment, Figure 5 As shown, the control method includes the following steps:

[0069] S21, obtaining the operating status of the medium temperature chiller 31;

[0070] S22. When the air conditioning system 100 is in summer operation, if the medium-temperature chiller 31 fails, the medium-temperature chiller 31 is controlled to be in a closed state, and the standby host 32 is controlled to be in a cooling mode.

[0071] The standby host 32 is in cooling mode, and the standby host 32 provides low-temperature refrigerant to the three-medium heat exchanger 33. The low-temperature refrigerant of the three-medium heat exchanger 33 fully exchanges heat with the return air of the clean room 1 and then outputs cold air. The cold air is mixed with the outdoor fresh air delivered by the fresh air unit 2 in the return air channel 11 to obtain low-temperature mixed air, which is sent to the clean room 1 to offset the sensible heat of the heat load in the clean room 1, so that the indoor temperature of the clean room 1 reaches the target temperature. Compared with the prior art, when the medium-temperature chiller 31 fails, the cooling mode is turned on by the standby host 32, and the return air with a large air volume can fully exchange heat with the low-temperature refrigerant, thereby controlling the stability of the indoor temperature and humidity and ensuring the reliability of the air conditioning system 100.

[0072] In one embodiment, the return air conditioning assembly 3 includes a second pipeline 37 and a second control valve 38, the first end of the second pipeline 37 is connected to the second output end of the three-medium heat exchanger 33, the second end of the second pipeline 37 is connected to the first input end of the medium-temperature chiller 31, and the second control valve 38 is arranged on the second pipeline 37. The control method includes the following steps:

[0073] When the air conditioning system 100 is operating in summer, if the medium-temperature chiller 31 operates normally and the temperature of the clean room 1 is higher than the target temperature, the opening of the second control valve 38 is controlled to increase.

[0074] Through the above control strategy, the flow rate of low-temperature chilled water entering the three-medium heat exchanger 33 can be increased, the heat exchange efficiency between the return air and the low-temperature chilled water in the clean workshop 1 can be improved, and the mixed air temperature can be reduced, so that the temperature of the clean workshop 1 is reduced to the target temperature, thereby improving the system reliability.

[0075] It should be understood that the terms used in the text are only for the purpose of describing specific example embodiments, and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used in the text may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0076] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0077] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An air conditioning system, characterized in that: include: Clean workshop; A fresh air unit, the output end of which is connected to the clean room and is used to transport outdoor fresh air; The return air conditioning component includes a medium-temperature chiller, a standby host and a three-medium heat exchanger, wherein the first output end of the medium-temperature chiller is connected to the first input end of the three-medium heat exchanger; the refrigerant output end of the standby host is connected to the second input end of the three-medium heat exchanger, and the standby host has a cooling mode and a heating mode; as well as A first temperature detection device, used to detect the temperature of the clean room; Among them, when the air-conditioning system is in transition season operation, if the number of powered-on units of the heat load in the clean room is lower than a preset number and the temperature of the clean room is lower than the target temperature, the medium-temperature chiller is controlled to be in a closed state, and the standby host is controlled to be in heating mode.

2. The air conditioning system according to claim 1, characterized in that: The return air regulating assembly includes a first pipeline and a first control valve. The first end of the first pipeline is connected to the refrigerant output end of the standby host, the second end of the first pipeline is connected to the second input end of the three-medium heat exchanger, and the first control valve is arranged on the first pipeline.

3. The air conditioning system according to claim 1, characterized in that: The return air adjustment component includes a second pipeline and a second control valve, the first end of the second pipeline is connected to the second output end of the three-medium heat exchanger, the second end of the second pipeline is connected to the first input end of the medium-temperature chiller, and the second control valve is arranged on the second pipeline.

4. The air conditioning system according to claim 1, characterized in that: The clean workshop includes a return air channel, a first end of the return air channel is connected to the air outlet of the fresh air unit through the fresh air channel, a first end of the return air channel is connected to the air outlet of the three-medium heat exchanger, and a second end of the return air channel is connected to the air supply outlet of the clean workshop.

5. The air conditioning system according to claim 4, characterized in that: The clean room comprises a top interlayer, the top interlayer is provided with a fan filter unit, the air inlet of the fan filter unit is connected to the second end of the return air channel, and the air outlet of the fan filter unit is connected to the air supply outlet of the clean room.

6. The air conditioning system according to any one of claims 1 to 5, characterized in that: The fresh air unit comprises a precooling section, a preheating section, a humidification section, a dehumidification section and a reheating section which are connected in sequence, so as to pretreat the outdoor fresh air passing through the air inlet of the fresh air unit.

7. The air conditioning system according to claim 1, characterized in that: The return air conditioning component comprises a cooling tower, the input end of the cooling tower is connected to the second output end of the medium-temperature chiller, and the output end of the cooling tower is connected to the second input end of the medium-temperature chiller.

8. A control method for an air conditioning system, applied to the air conditioning system according to any one of claims 1 to 7, characterized in that: The control method comprises: Obtaining the operating conditions of the air conditioning system, the number of powered-on units of the heat load in the clean room, and the temperature of the clean room; When the air-conditioning system is in transition season operation, if the number of heat loads in the clean room that are turned on is lower than a preset number and the temperature of the clean room is lower than a target temperature, the medium-temperature chiller is controlled to be in a closed state, and the standby host is controlled to be in heating mode.

9. The control method according to claim 8, characterized in that: The return air conditioning component of the air conditioning system includes a first pipeline and a first control valve, the first end of the first pipeline is connected to the refrigerant output end of the standby host, the second end of the first pipeline is connected to the second input end of the three-medium heat exchanger, the first control valve is arranged on the first pipeline, and the control method includes: After the standby host is controlled to be in the heating mode, if the temperature of the clean room is lower than the target temperature after a first period of time, the opening of the first control valve is controlled to increase until the temperature of the clean room is equal to the target temperature.

10. The control method according to claim 8, characterized in that: include: Obtaining the operating status of the medium-temperature chiller; When the air-conditioning system is in summer operation, if the medium-temperature chiller fails, the medium-temperature chiller is controlled to be in a closed state, and the standby host is controlled to be in a cooling mode.

11. The control method according to claim 10, characterized in that: The return air conditioning assembly includes a second pipeline and a second control valve, the first end of the second pipeline is connected to the second output end of the three-medium heat exchanger, the second end of the second pipeline is connected to the first input end of the medium-temperature chiller, the second control valve is arranged on the second pipeline, and the control method includes: When the air conditioning system is in summer operation, if the medium-temperature chiller operates normally and the temperature of the clean room is higher than the target temperature, the opening of the second control valve is controlled to increase.

Images