A smart air conditioning system and control method

Abstract

This invention provides an intelligent air conditioning system and control method, relating to the field of air conditioning technology. The system achieves energy conservation and emission reduction by prematurely shutting off the cooling function. The intelligent air conditioning system includes a chiller room system and a control system. The control system is further configured to: acquire a set shutdown time for the area where the intelligent air conditioning system is located; shut off the cooling function of the chiller system by a first set shutdown time earlier than the set shutdown time; acquire the outlet water temperature of the chiller system and the indoor temperature of the area where the intelligent air conditioning system is located; determine whether the outlet water temperature of the chiller system is lower than the first set temperature and whether the indoor temperature is lower than the second set temperature; if so, obtain a new premature shutdown time by a second set shutdown time earlier than the set shutdown time, and use the new premature shutdown time as the time for the next shutdown of the chiller system's cooling function; control the chiller system to shut off by the new premature shutdown time earlier than the set shutdown time.

Description

Technical Field

[0001] This invention relates to the field of air conditioning, and more particularly to an intelligent air conditioning system and control method. Background Technology

[0002] Against the backdrop of global warming, the "low-carbon economy," based on low energy consumption and low pollution, has become a global hot topic.

[0003] Large public buildings such as shopping malls, office buildings, and libraries usually only turn off their smart air conditioning systems when the business hours are over. At this time, the residual cold water in the chilled water pipes is no longer useful and can only be wasted.

[0004] Intelligent air conditioning systems consume a lot of energy during long-term operation. Therefore, reducing energy consumption while ensuring comfort has become an important issue for air conditioning automation system control technology. Summary of the Invention

[0005] This application provides an intelligent air conditioning system and control method. The system achieves energy saving and improves energy utilization efficiency by turning off the chiller unit in advance.

[0006] In a first aspect, embodiments of this application provide an intelligent air conditioning system.

[0007] The intelligent air conditioning system includes a chilled water system and a control system. The chilled water system includes fan coil units and a chilled water system. The fan coil units are used to cool the area. The chilled water system is connected to the fan coil units, and water circulates between the chilled water system and the fan coil units. The chilled water system has a cooling function.

[0008] The control system is electrically connected to the chilled water system and is configured to control the chilled water system to turn on or off. The control system is further configured to: acquire a set shutdown time for the area where the intelligent air conditioning system is located; shut off the cooling function of the chilled water system by a first set time advance shutdown time before the set shutdown time; acquire the outlet water temperature of the chilled water system and the indoor temperature of the area where the intelligent air conditioning system is located; determine whether the outlet water temperature of the chilled water system is lower than a first set temperature and whether the indoor temperature is lower than a second set temperature; if so, obtain a new advance shutdown time by a second set time before the advance shutdown time, and use the new advance shutdown time as the time to shut off the cooling function of the chilled water system next; and control the chilled water system to shut off by the new advance shutdown time before the set shutdown time.

[0009] Based on the above technical solutions, the intelligent air conditioning system provided in some embodiments of this application can effectively reduce building energy consumption and improve energy efficiency by turning off the chiller unit in advance, making full use of the residual cooling of the chilled water, and using the control system to determine the optimal time for early shutdown.

[0010] In some embodiments, the control system is further configured to: during the period when the cooling function of the chilled water system is turned off at the previously acquired early shutdown time, acquire the outlet water temperature of the chilled water system and the indoor temperature of the area where the intelligent air conditioning system is located; determine whether the outlet water temperature of the chilled water system is lower than a first set temperature and whether the indoor temperature is lower than a second set temperature; if so, advance the second set time before the previously acquired early shutdown time to obtain a new early shutdown time, and use the new early shutdown time as the time for turning off the cooling function of the chilled water system next; if not, use the two previously acquired early shutdown times as the time for turning off the cooling function of the chilled water system next.

[0011] In some embodiments, the control system is further configured to: before turning off the cooling function of the chilled water system by a first preset time before the set shutdown time; detect whether the required temperature of the area where the intelligent air conditioning system is located is greater than a threshold temperature; if so, execute the step of turning off the cooling function of the chilled water system at the preset shutdown time; if not, increase the outlet water temperature of the chilled water system; determine whether the outlet water temperature of the chilled water system is less than a fourth preset temperature and whether the indoor temperature is less than a fifth preset temperature; if so, turn off the cooling function of the chilled water system by a third preset time before the set shutdown time, and increase the outlet water temperature of the chilled water system in the next step; if not, decrease the outlet water temperature of the chilled water system until the outlet water temperature of the chilled water system is less than the fourth preset temperature and the indoor temperature is less than the fifth preset temperature.

[0012] In some embodiments, the chilled water system includes: a cooling tower assembly, a cooling pump assembly, a chiller unit, and a chilled water pump assembly; the input end of the cooling pump assembly is connected to the output end of the cooling tower assembly; the first input end of the chiller unit is connected to the output end of the cooling pump assembly, the first output end of the chiller unit is connected to the input end of the cooling tower assembly, and the second output end of the chiller unit is connected to the input end of the fan coil unit; the input end of the chilled water pump assembly is connected to the output end of the fan coil unit, and the output end of the chilled water pump assembly is connected to the second input end of the chiller unit.

[0013] The control system is communicatively connected to the cooling tower group, the cooling pump group, the chiller group, and the chilled water pump group; the control system is configured to: shut down the cooling function of the chilled water system, specifically configured to: shut down the chiller group, and keep the cooling tower group, the cooling pump group, and the chilled water pump group running continuously.

[0014] In some embodiments, the control system is configured to: shut down the chiller unit and keep the cooling tower group, cooling pump group and chilled water pump group running continuously, specifically configured to: control the cooling pump group to adjust the frequency according to the temperature difference between the cooling supply and return water, and control the chilled water pump group to adjust the frequency according to the pressure difference between the chilled water supply and return water.

[0015] In some embodiments, the control system is configured to: shut down the chiller unit and keep the cooling tower group, cooling pump group and chilled pump group running continuously. Specifically, it is further configured to: determine whether the outlet water temperature of the cooling tower group is within the third temperature range of the wet-bulb temperature; if so, control the number of operating cooling tower groups to remain unchanged; if not, adjust the number of operating cooling tower groups until the outlet water temperature of the cooling tower group is within the third temperature range of the wet-bulb temperature.

[0016] In some embodiments, the control system is configured to control the chilled water system to shut down a new time before the set shutdown time, specifically configured to shut down the chiller unit, the cooling tower group, the cooling pump group, and the chilled water pump group.

[0017] Secondly, some embodiments of this application provide a control method for an intelligent air conditioning system.

[0018] The control method includes: the control system acquiring a set shutdown time for the area where the intelligent air conditioning system is located; the control system shutting down the cooling function of the chilled water system by a first set time advance shutdown time before the set shutdown time; the control system acquiring the outlet water temperature of the chilled water system and the indoor temperature of the area where the intelligent air conditioning system is located; the control system determining whether the outlet water temperature of the chilled water system is lower than the first set temperature and whether the indoor temperature is lower than the second set temperature; if so, obtaining a new advance shutdown time by a second set time before the advance shutdown time, and using the new advance shutdown time as the time for the next shutdown of the cooling function of the chilled water system; and the control system controlling the chilled water system to shut down by the new advance shutdown time before the set shutdown time.

[0019] The beneficial effects of the control method in the second aspect are the same as those of the intelligent air conditioning system mentioned above, and will not be repeated here.

[0020] In some embodiments, the control method further includes: the control system, based on the previously acquired advance shutdown time, the period during which the cooling function of the chilled water system is shut down, acquiring the outlet water temperature of the chilled water system and the indoor temperature of the area where the intelligent air conditioning system is located; the control system determines whether the outlet water temperature of the chilled water system is lower than a first set temperature and whether the indoor temperature is lower than a second set temperature; if so, the control system advances the previously acquired advance shutdown time by the second set time to obtain a new advance shutdown time, and uses the new advance shutdown time as the time for the next shutdown of the cooling function of the chilled water system; if not, the control system uses the two previously acquired advance shutdown times as the time for the next shutdown of the cooling function of the chilled water system.

[0021] In some embodiments, the control method further includes: before the control system shuts down the cooling function of the chilled water system by a first preset time before the preset shutdown time; the control system detects whether the required temperature of the area where the intelligent air conditioning system is located is greater than a threshold temperature; if so, it executes the step of shutting down the cooling function of the chilled water system at the preset shutdown time; if not, it increases the outlet water temperature of the chilled water system; the control system determines whether the outlet water temperature of the chilled water system is less than a fourth preset temperature and whether the indoor temperature is less than a fifth preset temperature; if so, it shuts down the cooling function of the chilled water system by a third preset time before the preset shutdown time, and increases the outlet water temperature of the chilled water system in the next step; if not, it decreases the outlet water temperature of the chilled water system until the outlet water temperature of the chilled water system is less than the fourth preset temperature and the indoor temperature is less than the fifth preset temperature. Attached Figure Description

[0022] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.

[0023] Figure 1 This is a structural block diagram of an intelligent air conditioning system provided in an embodiment of the present invention;

[0024] Figure 2 A partial flowchart of a control method provided in an embodiment of the present invention;

[0025] Figure 3 This is another part of the flowchart of a control method provided in an embodiment of the present invention;

[0026] Figure 4 A flowchart illustrating an overall control method provided in an embodiment of the present invention;

[0027] Figure 5This is a schematic diagram of the composition of a chiller room system provided in an embodiment of the present invention;

[0028] Figure 6 A structural block diagram of a chiller room system provided in an embodiment of the present invention;

[0029] Figure 7 This is a schematic diagram of another chiller room system provided in an embodiment of the present invention;

[0030] Figure 8 A structural block diagram of another chiller room system provided in an embodiment of the present invention;

[0031] Figure 9 A schematic diagram of the composition of another chiller room system provided in an embodiment of the present invention;

[0032] Figure 10 A structural block diagram of another chiller room system provided in an embodiment of the present invention;

[0033] Figure 11 A partial flowchart of another control method provided in an embodiment of the present invention;

[0034] Figure 12 A partial flowchart of another control method provided in an embodiment of the present invention;

[0035] Figure 13 This is a partial flowchart of another control method provided in an embodiment of the present invention. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0038] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, when describing pipelines, the terms "connected" and "linked" as used in this invention have the meaning of enabling conduction. The specific meaning needs to be understood in conjunction with the context.

[0040] In embodiments of the present invention, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" or "for example" in embodiments of the present invention should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0041] As described in the background section, against the backdrop of global warming, the "low-carbon economy," based on low energy consumption and low pollution, has become a global hot topic.

[0042] Large public buildings such as shopping malls, office buildings, and libraries usually only turn off their smart air conditioning systems when the business hours are over. At this time, the residual cold water in the chilled water pipes is no longer useful and can only be wasted.

[0043] Intelligent air conditioning systems consume a lot of energy during long-term operation. Therefore, reducing energy consumption while ensuring comfort has become an important issue for air conditioning automation system control technology.

[0044] Based on this, this application provides an intelligent air conditioning system. For example... Figure 1 As shown, the intelligent air conditioning system 1000 includes: a chiller room system 100 and a control system 200.

[0045] The chilled water system 100 includes: fan coil unit 10 and chilled water system 20. The fan coil unit 10 is used to cool the area. The chilled water system 20 is connected to the fan coil unit 10, and water circulates between the chilled water system 20 and the fan coil unit 10. The chilled water system 20 has a cooling function.

[0046] The control system 200 is electrically connected to the chiller room system 100, and the control system 200 is configured to control the chiller system 20 to turn on or off.

[0047] Reference Figure 2 and Figure 3The control system 200 is also configured to: S1, obtain the set shutdown time t of the area where the intelligent air conditioning system 1000 is located; S11, the control system 200 shuts down the cooling function of the chilled water system 20 before the set shutdown time t is a first set shutdown time t1.

[0048] S12, the control system 200 acquires the outlet water temperature Tc of the chilled water system and the indoor temperature Tn of the area where the intelligent air conditioning system is located.

[0049] S13. The control system 200 determines whether the outlet water temperature Tc of the cold water system 20 is less than the first set temperature T1 and whether the indoor temperature Tn is less than the second set temperature T2.

[0050] S14. If so, then the new early shutdown time is obtained by advancing the second set time t2 before the early shutdown time, and the new early shutdown time is used as the time for the next shutdown of the cooling function of the chilled water system 20.

[0051] S19, The control system 200 controls the chilled water system 20 to shut down at a new advance shutdown time t, ahead of the set shutdown time.

[0052] For example, the set shutdown time for a certain area is set to 22:00, and the required temperature T for that area is 28℃; the first set time t1 is 15min, the second set time t2 is 5min, the first set temperature T1 is 15℃, and the second set temperature T2 is 28℃.

[0053] The control system 200 shuts down the cooling function of the chilled water system 20 by a first set time t1 before the set shutdown time t. That is, the control system 200 shuts down the cooling function of the chilled water system 20 at 21:45 on the first day, and continues to cool the area through residual cooling.

[0054] The control system 200 acquires the outlet water temperature Tc of the chilled water system and the indoor temperature Tn of the area where the intelligent air conditioning system is located. If the outlet water temperature Tc of the chilled water system is 12℃ and the indoor temperature Tn of the area where the intelligent air conditioning system is located is 25℃, then Tc < T1 and Tn < T2. This means that after the cooling function of the chilled water system 20 is turned off at 21:45, the outlet water temperature Tc of the chilled water system and the indoor temperature Tn of the area where the intelligent air conditioning system is located do not exceed the first set temperature T1 and the second set temperature T2 before 22:00. Therefore, the shutdown time can be advanced further. The cooling function of the chilled water system 20 will be turned off at 21:40 the next day.

[0055] The intelligent air conditioning system provided in some embodiments of this application can effectively reduce building energy consumption and improve energy efficiency by turning off the chiller unit in advance, making full use of the residual cooling of the chilled water, and using the control system to determine the optimal time for early shutdown.

[0056] like Figure 3 As shown, the control system 200 is also configured to: S15, during the period when the cooling function of the chilled water system 20 is turned off at the previously acquired advance shutdown time, acquire the outlet water temperature Tc of the chilled water system 20 and the indoor temperature Tn of the area where the intelligent air conditioning system is located.

[0057] S16. Determine whether the outlet water temperature Tc of the chilled water system 20 is less than the first set temperature T1 and whether the indoor temperature Tn is less than the second set temperature T2; S17. If yes, then advance the previously obtained early shutdown time by the second set time t2 to obtain a new early shutdown time, and use the new early shutdown time as the time to shut down the cooling function of the chilled water system next time; S18. If no, then use the two early shutdown times obtained before as the time to shut down the cooling function of the chilled water system next time.

[0058] For example, the set shutdown time for a certain area is set to 22:00, and the required temperature T for that area is 28℃; the first set time t1 is 15min, the second set time t2 is 5min, the first set temperature T1 is 15℃, and the second set temperature T2 is 28℃.

[0059] The control system 200 shuts down the cooling function of the chilled water system 20 by a first set time t1 before the set shutdown time t. That is, the control system 200 shuts down the cooling function of the chilled water system 20 at 21:45 on the first day, and continues to cool the area through residual cooling.

[0060] The control system 200 acquires the outlet water temperature Tc of the chilled water system and the indoor temperature Tn of the area where the intelligent air conditioning system is located. First scenario: If the outlet water temperature Tc of the chilled water system is 12℃ and the indoor temperature Tn of the area where the intelligent air conditioning system is located is 25℃, then Tc < T1 and Tn < T2. This means that after the cooling function of the chilled water system 20 is turned off at 21:45, the outlet water temperature Tc of the chilled water system and the indoor temperature Tn of the area where the intelligent air conditioning system is located do not exceed the first set temperature T1 and the second set temperature T2 before 22:00. Therefore, the shutdown time can be advanced further.

[0061] The next day, at 21:40, the cooling function of the chilled water system 20 will be shut down. The control system 200 will then retrieve the outlet water temperature Tc of the chilled water system and the indoor temperature Tn of the area where the intelligent air conditioning system is located.

[0062] If the outlet water temperature Tc of the chilled water system is 14℃ and the indoor temperature Tn of the area where the smart air conditioning system is located is 27℃, then Tc < T1 and Tn < T2. This means that after the chilled water system 20's cooling function is turned off at 21:40, neither the outlet water temperature Tc nor the indoor temperature Tn of the area where the smart air conditioning system is located exceeds the first set temperature T1 and the second set temperature T2 before 22:00. Therefore, the shutdown time can be advanced further. Specifically, under the condition that Tc < T1 and Tn < T2, the advanced shutdown time increases by 5 minutes with the second set time t2 to obtain a new advanced shutdown time, which is then used as the time for the next shutdown of the chilled water system 20's cooling function.

[0063] If the outlet water temperature Tc of the chilled water system is 16℃ and the indoor temperature Tn of the area where the smart air conditioning system is located is 29℃, then the conditions Tc < T1 and Tn < T2 are not met. That is, after the cooling function of the chilled water system 20 is turned off at 21:40, if the outlet water temperature Tc of the chilled water system and the indoor temperature Tn of the area where the smart air conditioning system is located exceed the first set temperature T1 and the second set temperature T2 before 22:00, then the shutdown time cannot be advanced any further. On the third day, the cooling function of the chilled water system 20 will be turned off at 21:45, and the shutdown times obtained from the first two advance shutdowns will be used as the time for the next shutdown of the chilled water system's cooling function.

[0064] In some embodiments, the control system 200 acquires the outlet water temperature Tc of the chilled water system and the indoor temperature Tn of the area where the smart air conditioning system is located. In the second case: if the outlet water temperature Tc of the chilled water system is 16°C and the indoor temperature Tn of the area where the smart air conditioning system is located is 29°C, then the conditions Tc < T1 and Tn < T2 are not met. That is, after the cooling function of the chilled water system 20 is turned off at 21:45, if the outlet water temperature Tc of the chilled water system and the indoor temperature Tn of the area where the smart air conditioning system is located exceed the first set temperature T1 and the second set temperature T2 before 22:00, then the shutdown time cannot be advanced the following day.

[0065] The next day, at 21:50, the cooling function of the chilled water system 20 is turned off. The control system 200 obtains the outlet water temperature Tc of the chilled water system and the indoor temperature Tn of the area where the intelligent air conditioning system is located. If the outlet water temperature Tc of the chilled water system is 15.5℃ and the indoor temperature Tn of the area where the intelligent air conditioning system is located is 28.5℃, then the conditions Tc < T1 and Tn < T2 are not met. That is to say, after the cooling function of the chilled water system 20 is turned off at 21:50, if the outlet water temperature Tc of the chilled water system and the indoor temperature Tn of the area where the intelligent air conditioning system is located exceed the first set temperature T1 and the second set temperature T2 before 22:00, then the shutdown time cannot be advanced again on the third day. On the third day, at 21:55, the cooling function of the chilled water system 20 is turned off. The control system 200 obtains the outlet water temperature Tc of the chilled water system and the indoor temperature Tn of the area where the intelligent air conditioning system is located until the conditions Tc < T1 and Tn < T2 are met.

[0066] In some embodiments, due to seasonal changes and changes in the load on the terminal of the smart air conditioning system, such as an increase in the occupancy rate of office buildings, the load on the terminal of the smart air conditioning system increases significantly, making the previously recorded early shutdown time no longer applicable. That is, the recorded values ​​of the first set temperature T1 and the second set temperature T2 do not meet the above requirements, and the above process is re-executed.

[0067] For example, during the transitional season, although the first set temperature T1 and the second set temperature T2 are both within the required range, the air conditioning usage and indoor load are significantly reduced due to the transitional season. There is still room for optimization based on the currently recorded early shutdown time. For example, if the recorded T1 < 14℃ and T2 < 27℃, the above steps can be executed again to make full use of the residual cooling of the chiller unit, improve energy efficiency, and reduce energy consumption.

[0068] Fan coil units, serving as terminal devices of the chilled water system 20, are distributed throughout each air-conditioned room, independently processing the air. The chilled and hot water required for air processing is centrally prepared by the chilled water system 20 and supplied to each fan coil unit. The working principle of a fan coil unit is as follows: chilled or hot water flows through the coil, exchanging heat with the outside air, thus cooling, dehumidifying, or heating the air to regulate indoor air parameters. It is a commonly used terminal device for cooling and heating.

[0069] The intelligent air conditioning system provided in some embodiments of this application can effectively reduce building energy consumption and improve energy efficiency by turning off the cooling function of the chilled water system in advance, making full use of the residual cooling of the chilled water, and using the control system to determine the optimal time for early shutdown.

[0070] like Figure 4As shown, the control system 200 is also configured to: S11, before turning off the cooling function of the chilled water system by a first set time t1 before the set shutdown time t; S21, detect whether the required temperature T of the area where the intelligent air conditioning system is located is greater than the threshold temperature Tx.

[0071] If so, then proceed with the step of shutting down the cooling function of the chilled water system at the pre-shutdown time.

[0072] If not, S22, then increase the outlet water temperature of the chilled water system.

[0073] S23. Determine whether the outlet water temperature of the cold water system is lower than the fourth set temperature and whether the indoor temperature is lower than the fifth set temperature.

[0074] If so, S24, then the cooling function of the chilled water system will be turned off at the third pre-set time before the set shutdown time, and the outlet water temperature of the chilled water system will be increased in the next operation.

[0075] If not, S25, then reduce the outlet water temperature of the chilled water system until the outlet water temperature of the chilled water system is lower than the fourth set temperature and the indoor temperature is lower than the fifth set temperature.

[0076] In some embodiments, the threshold temperature Tx is 26°C.

[0077] For example, the set shutdown time for a certain area is set to 22:00, and the required temperature T for that area is 28℃; the first set time t1 is 15min, the second set time t2 is 5min, the first set temperature T1 is 15℃, the second set temperature T2 is 28℃, the fourth set temperature T4 is 11℃, the fifth set temperature T5 is 26℃, and the threshold temperature Tx is 26℃.

[0078] At this point, the required temperature T in the area is greater than the threshold temperature Tx, so continue with the above steps.

[0079] The control system 200 shuts down the cooling function of the chilled water system 20 by a first set time t1 before the set shutdown time t. That is, the control system 200 shuts down the cooling function of the chilled water system 20 at 21:45 on the first day, and continues to cool the area through residual cooling.

[0080] The control system 200 acquires the outlet water temperature Tc of the chilled water system and the indoor temperature Tn of the area where the intelligent air conditioning system is located. First scenario: If the outlet water temperature Tc of the chilled water system is 12℃ and the indoor temperature Tn of the area where the intelligent air conditioning system is located is 25℃, then Tc < T1 and Tn < T2. This means that after the cooling function of the chilled water system 20 is turned off at 21:45, the outlet water temperature Tc of the chilled water system and the indoor temperature Tn of the area where the intelligent air conditioning system is located do not exceed the first set temperature T1 and the second set temperature T2 before 22:00. Therefore, the shutdown time can be advanced further.

[0081] The next day, at 21:40, the cooling function of the chilled water system 20 will be shut down. The control system 200 will then retrieve the outlet water temperature Tc of the chilled water system and the indoor temperature Tn of the area where the intelligent air conditioning system is located.

[0082] If the outlet water temperature Tc of the chilled water system is 14℃ and the indoor temperature Tn of the area where the smart air conditioning system is located is 27℃, then Tc < T1 and Tn < T2. This means that after the chilled water system 20's cooling function is turned off at 21:40, neither the outlet water temperature Tc nor the indoor temperature Tn of the area where the smart air conditioning system is located exceeds the first set temperature T1 and the second set temperature T2 before 22:00. Therefore, the shutdown time can be advanced further. Specifically, under the condition that Tc < T1 and Tn < T2, the advanced shutdown time increases by 5 minutes with the second set time t2 to obtain a new advanced shutdown time, which is then used as the time for the next shutdown of the chilled water system 20's cooling function.

[0083] If the outlet water temperature Tc of the chilled water system is 16℃ and the indoor temperature Tn of the area where the smart air conditioning system is located is 29℃, then the conditions Tc < T1 and Tn < T2 are not met. That is, after the cooling function of the chilled water system 20 is turned off at 21:40, if the outlet water temperature Tc of the chilled water system and the indoor temperature Tn of the area where the smart air conditioning system is located exceed the first set temperature T1 and the second set temperature T2 before 22:00, then the shutdown time cannot be advanced any further. On the third day, the cooling function of the chilled water system 20 will be turned off at 21:45, and the shutdown times obtained from the first two advance shutdowns will be used as the time for the next shutdown of the chilled water system's cooling function.

[0084] For example, the set shutdown time for a certain area is set to 22:00, and the required temperature T for that area is 26℃; the first set time t1 is 15min, the second set time t2 is 5min, the third set time t3 is 5min, the fourth set temperature T4 is 11℃, the fifth set temperature T5 is 26℃, and the threshold temperature Tx is 26℃.

[0085] At this point, the required temperature T in this area is the same as the threshold temperature Tx, so the outlet water temperature Tc of the chilled water system needs to be increased.

[0086] The control system 200 determines that the outlet water temperature Tc of the chilled water system is less than the fourth set temperature T4, and the indoor temperature Tn is less than the fifth set temperature T5. Therefore, it shuts off the cooling function of the chilled water system at a time t3 earlier than the set shut-off time t, and then raises the outlet water temperature Tc of the chilled water system by 1°C each time.

[0087] That is, the control system 200 shuts down the cooling function of the chilled water system 20 at 21:55 on the first day, and continues to cool the area through residual cooling. The fourth set temperature T4 is increased to 12℃.

[0088] If the chilled water system outlet temperature Tc is not lower than the fourth set temperature T4, and the indoor temperature Tn is not lower than the fifth set temperature T5, then the chilled water system outlet temperature will be reduced until the chilled water system outlet temperature is lower than the fourth set temperature T4, and the indoor temperature is lower than the fifth set temperature T5. The outlet temperature will decrease by 1℃ each time, that is, the fourth set temperature T4 will be reduced to 10℃.

[0089] like Figure 5 and Figure 6 As shown, the chilled water system 20 also includes: a cooling tower assembly 1, a cooling pump assembly 2, a chiller unit 3, and a chilled water pump assembly 4.

[0090] The input end of cooling pump unit 2 is connected to the output end of cooling tower unit 1; the first input end of chiller unit 3 is connected to the output end of cooling pump unit 2, the first output end of chiller unit 3 is connected to the input end of cooling tower unit 1, and the second output end of chiller unit 3 is connected to the input end of fan coil unit 10; the input end of chilled pump unit 4 is connected to the output end of fan coil unit 10, and the output end of chilled pump unit 4 is connected to the second input end of chiller unit 3.

[0091] For example, cooling tower group 1 refers to multiple cooling towers, such as Figure 5 The first cooling tower 11 and the second cooling tower 12 are mentioned; similarly, cooling pump group 2 refers to multiple cooling pumps, for example... Figure 5 The first cooling pump 21, the second cooling pump 22, and the third cooling pump 23 are mentioned; chiller unit 3 refers to multiple chiller units, such as... Figure 5 The first chiller unit 31, the second chiller unit 32, and the third chiller unit 33 are mentioned; the chilled water pump unit 4 refers to multiple chilled water pumps, such as... Figure 5 The first refrigeration pump 41, the second refrigeration pump 42, and the third refrigeration pump 43 are included.

[0092] Reference Figure 5 The input terminals of the first cooling tower 11 and the second cooling tower 12 are connected together; the output terminals of the first cooling tower 11 and the second cooling tower 12 are connected together.

[0093] The input terminals of the first cooling pump 21, the second cooling pump 22, and the third cooling pump 23 are connected together; the output terminals of the first cooling pump 21, the second cooling pump 22, and the third cooling pump 23 are connected together.

[0094] The first input terminal of the first chiller unit 31, the first input terminal of the second chiller unit 32, and the first input terminal of the third chiller unit 33 are connected together; the second input terminal of the first chiller unit 31, the second input terminal of the second chiller unit 32, and the second input terminal of the third chiller unit 33 are connected together; the first output terminal of the first chiller unit 31, the first output terminal of the second chiller unit 32, and the first output terminal of the third chiller unit 33 are connected together; the second output terminal of the first chiller unit 31, the second output terminal of the second chiller unit 32, and the second output terminal of the third chiller unit 33 are connected together.

[0095] In summary, referring to Figure 5 The chiller unit 3 generates 37°C cooling water, which is then transferred to the cooling tower group 1 for cooling. After being cooled by the cooling tower group 1, the 37°C cooling water becomes 32°C cooling water, which is then transferred to the chiller unit 3 via the cooling pump group 2. This process is repeated to complete the cycle.

[0096] Chiller unit 3 generates chilled water at 7°C and transfers it to the fan coil unit for air heat exchange to lower the indoor temperature. After being heated, the 7°C chilled water becomes 12°C chilled water, which is then transferred to chiller unit 3 via chilled water pump unit 4. This process is repeated to complete the cycle.

[0097] The control system 200 is communicatively connected to the cooling tower group 1, the cooling pump group 2, the chiller group 3, and the chilled water pump group 4.

[0098] The control system 200 is configured to: S11, shut down the cooling function of the chilled water system, specifically configured to: S111, shut down the chiller unit, and keep the cooling tower group, cooling pump group and chilled water pump group running continuously.

[0099] A chiller unit uses an evaporator to exchange heat between water and refrigerant. The refrigerant absorbs heat from the high-temperature chilled water (12°C) in the evaporator, causing the water to cool down and produce low-temperature chilled water (7°C). The compressor then carries the heat to the condenser, where the refrigerant exchanges heat with the low-temperature cooling water. The cooling water absorbs the heat and then carries it out through water pipes to an external cooling tower for heat dissipation.

[0100] In some embodiments, the chiller unit is a water-cooled chiller unit.

[0101] like Figure 6As shown, the chiller unit 3 includes: an evaporator 60, a compressor 70, a condenser 80, and a first filter 90.

[0102] The evaporator 60 has its first input end connected to the output end of the first filter 90 and also to the output end of the compressor 70. The second input end of the evaporator 60 is connected to the output end of the chilled water pump 4. The first output end of the evaporator 60 is connected to the input end of the compressor 70 and the second output end of the evaporator 60 is connected to the fan coil unit 10. The condenser 80 has its first input end connected to the output end of the compressor 70. The second input end of the condenser 80 is connected to the output end of the cooling pump 2. The first output end of the condenser 80 is connected to the input end of the first filter 90 and the second output end of the condenser 80 is connected to the input end of the cooling tower 1.

[0103] The specific working process is as follows: At the beginning, the compressor 70 draws in the low-temperature, low-pressure refrigerant gas after evaporation and cooling, and then compresses it into a high-temperature, high-pressure gas and sends it to the condenser 80; after the high-pressure, high-temperature gas is cooled by the condenser 80, the gas condenses into a room-temperature, high-pressure liquid; when the room-temperature, high-pressure liquid is throttled into a low-temperature, low-pressure wet vapor, it flows into the evaporator 60 and absorbs the heat of the chilled water in the evaporator 60, causing the water temperature to drop; the evaporated refrigerant is then drawn back into the compressor 70, and the next refrigeration cycle is repeated.

[0104] Among them, chilled water pump 4 is used to circulate chilled water. The chilled water enters the fan coil unit 10 and exchanges heat with the indoor air to reduce the indoor air temperature and achieve the purpose of cooling. Cooling pump 2 is used to circulate cooling water. The chilled water takes away the indoor heat and transfers the heat to the cooling water through the refrigerant in the main unit. The cooling pump presses the heated cooling water into the cooling tower 1 to exchange heat with the atmosphere. After cooling down, it is sent back to the condenser 80 in the chiller unit 3 to continue the heat exchange.

[0105] like Figure 7 and Figure 8 As shown, the chilled water system 20 also includes: a water supply pump 5 and a water supply valve 6; the input end of the water supply pump 5 is connected to the water source 7; the input end of the water supply valve 6 is connected to the output end of the water supply pump 5, and the output end of the water supply valve 6 is connected to the input end of the chilled water pump set 4.

[0106] The control system 200 is communicatively connected to the water supply pump 5 and the water supply valve 6.

[0107] As can be seen from the above, the chilled water system 20 and the fan coil unit 10 can form a cycle. That is to say, under ideal conditions, the total amount of water in the chilled water system 20 and the fan coil unit 10 remains unchanged.

[0108] like Figure 9 and Figure 10As shown, in some embodiments, the cold water system 20 further includes a second filter 91. The input end of the second filter 91 is connected to the water source 7, and the output end of the second filter 91 is connected to the input end of the water supply valve 6.

[0109] The second filter 91 is configured to filter out impurities in the water source 7 to prevent impurities from damaging the chiller room system 100.

[0110] like Figure 11 As shown, the control system 200 is configured as follows: S111, shut down the chiller unit, and keep the cooling tower group, cooling pump group, and chilled water pump group running continuously, specifically configured as follows:

[0111] S1111 Control the cooling pump group to adjust the frequency according to the temperature difference between the cooling supply and return water, and control the chilled water pump group to adjust the frequency according to the pressure difference between the chilled water supply and return water.

[0112] like Figure 12 As shown, the control system 200 is configured to: S111, shut down the chiller unit, and keep the cooling tower group, cooling pump group, and chilled water pump group running continuously; specifically, it is further configured to:

[0113] S1112. Determine whether the outlet water temperature of the cooling tower group is within the third temperature range of the wet bulb temperature.

[0114] S1113. If so, then the number of operating cooling tower groups remains unchanged;

[0115] S1114. If not, adjust the number of operating cooling towers until the outlet water temperature of the cooling towers is within the third temperature range of the wet-bulb temperature.

[0116] The wet-bulb temperature (adiabatic saturation temperature) refers to the temperature of a system under adiabatic conditions where a large amount of water is in contact with a limited amount of moist air, and the latent heat required for water evaporation comes entirely from the sensible heat released by the decrease in the temperature of the moist air. When the air in the system reaches saturation and the system is in thermal equilibrium, the wet-bulb temperature is simply the lowest temperature that can be reached in the current environment solely through the evaporation of water. Thermodynamic wet-bulb temperature is also called adiabatic saturation temperature.

[0117] like Figure 13 As shown, the control system is configured as follows: S19, controlling the chilled water system to shut down a new pre-shutdown time before the set shutdown time, specifically configured as follows:

[0118] S191. Shut down the chiller unit, cooling tower unit, cooling pump unit, and chilled water pump unit.

[0119] like Figure 2 , Figure 3 and Figure 4 The diagram illustrates a control method provided in some embodiments of this application. The specific process is as follows:

[0120] Reference Figure 2 and Figure 3 :

[0121] S1. The control system obtains the set shutdown time t for the area where the intelligent air conditioning system is located.

[0122] S11. The control system shuts down the cooling function of the chilled water system by setting a shutdown time t 1 ahead of the first set shutdown time t1.

[0123] S12. The control system obtains the outlet water temperature Tc of the chilled water system and the indoor temperature Tn of the area where the intelligent air conditioning system is located.

[0124] S13. The control system determines whether the outlet water temperature Tc of the cold water system is less than the first set temperature T1 and whether the indoor temperature Tn is less than the second set temperature T2.

[0125] If so, proceed to step S14.

[0126] S14. The control system advances the shutdown time by a second set time t2 to obtain a new early shutdown time, and uses the new early shutdown time as the time for the next shutdown of the cooling function of the chilled water system.

[0127] S15. The control system obtains the outlet water temperature Tc of the chilled water system and the indoor temperature Tn of the area where the intelligent air conditioning system is located, based on the previously acquired advance shutdown time and the period during which the cooling function of the chilled water system is turned off.

[0128] S16. The control system determines whether the outlet water temperature Tc of the cold water system 20 is less than the first set temperature T1 and whether the indoor temperature Tn is less than the second set temperature T2.

[0129] If yes, proceed to step S17; otherwise, proceed to step S18.

[0130] S17. The control system then advances the previously obtained early shutdown time by a second set time t2 to obtain a new early shutdown time, and uses the new early shutdown time as the time to shut down the cooling function of the chilled water system next time.

[0131] S18. The control system uses the two previously obtained advance shutdown times as the time to shut down the cooling function of the chilled water system for the next time.

[0132] S19. The control system controls the chilled water system to shut down a new time before the set shutdown time.

[0133] Reference Figure 4 :

[0134] S1. The control system obtains the set shutdown time t for the area where the intelligent air conditioning system is located.

[0135] S21. The control system detects whether the required temperature T in the area where the intelligent air conditioning system is located is greater than the threshold temperature Tx.

[0136] If yes, proceed to step S11; otherwise, proceed to step S22.

[0137] S11. The control system shuts down the cooling function of the chilled water system by setting a shutdown time t 1 ahead of the first set shutdown time t1.

[0138] S12. The control system obtains the outlet water temperature Tc of the chilled water system and the indoor temperature Tn of the area where the intelligent air conditioning system is located.

[0139] S13. The control system determines whether the outlet water temperature Tc of the cold water system is less than the first set temperature T1 and whether the indoor temperature Tn is less than the second set temperature T2.

[0140] If so, proceed to step S14.

[0141] S14. The control system advances the shutdown time by a second set time t2 to obtain a new early shutdown time, and uses the new early shutdown time as the time for the next shutdown of the cooling function of the chilled water system.

[0142] S15. The control system obtains the outlet water temperature Tc of the chilled water system and the indoor temperature Tn of the area where the intelligent air conditioning system is located, based on the previously acquired advance shutdown time and the period during which the cooling function of the chilled water system is turned off.

[0143] S16. The control system determines whether the outlet water temperature Tc of the cold water system 20 is less than the first set temperature T1 and whether the indoor temperature Tn is less than the second set temperature T2.

[0144] If yes, proceed to step S17; otherwise, proceed to step S18.

[0145] S17. The control system then advances the previously obtained early shutdown time by a second set time t2 to obtain a new early shutdown time, and uses the new early shutdown time as the time to shut down the cooling function of the chilled water system next time.

[0146] S18. The control system uses the two previously obtained advance shutdown times as the time to shut down the cooling function of the chilled water system for the next time.

[0147] S19. The control system controls the chilled water system to shut down a new time before the set shutdown time.

[0148] S22, The control system increases the outlet water temperature of the chilled water system.

[0149] S23. The control system determines whether the outlet water temperature of the chilled water system is lower than the fourth set temperature and whether the indoor temperature is lower than the fifth set temperature.

[0150] S24. The control system shuts down the cooling function of the chilled water system by a third preset time before the set shutdown time, and then raises the outlet water temperature of the chilled water system on the next run.

[0151] S25. The control system reduces the outlet water temperature of the chilled water system until the outlet water temperature of the chilled water system is lower than the fourth set temperature and the indoor temperature is lower than the fifth set temperature.

[0152] Some embodiments of this application provide a control method for an intelligent air conditioning system. This control method can effectively reduce building energy consumption and improve energy efficiency by turning off the chiller unit in advance, making full use of the residual cooling of the chilled water, and using the method to determine the optimal time for shutdown.

[0153] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An intelligent air conditioning system, characterized in that, include: The chiller room system includes: Fan coil units are used to cool the area they are in. A chilled water system is connected to the fan coil unit, and water circulates between the chilled water system and the fan coil unit. The chilled water system has a cooling function. A control system, electrically connected to the chilled water system, is configured to control the chilled water system to turn on or off. The control system is also configured to: Obtain the set shutdown time for the area where the intelligent air conditioning system is located; The cooling function of the cold water system is turned off by a pre-set time earlier than the set shutdown time. Obtain the outlet water temperature of the cold water system and the indoor temperature of the area where the intelligent air conditioning system is located; Determine whether the outlet water temperature of the cold water system is lower than the first set temperature, and whether the indoor temperature is lower than the second set temperature; If so, then the new early shutdown time is obtained by advancing the early shutdown time by a second set time, and the new early shutdown time is used as the time for the next shutdown of the cooling function of the cold water system; The chilled water system is controlled to shut down a new time earlier than the set shutdown time.

2. The intelligent air conditioning system according to claim 1, characterized in that, The control system is also configured to: during the period when the cooling function of the chilled water system is turned off based on the previously acquired early shutdown time, acquire the outlet water temperature of the chilled water system and the indoor temperature of the area where the intelligent air conditioning system is located. Determine whether the outlet water temperature of the cold water system is lower than the first set temperature, and whether the indoor temperature is lower than the second set temperature; If so, the new early shutdown time is obtained by advancing the second set time before the previously obtained early shutdown time, and the new early shutdown time is used as the time to shut down the cooling function of the cold water system next time. If not, the two previously obtained early shutdown times will be used as the time for the next shutdown of the cooling function of the chilled water system.

3. The intelligent air conditioning system according to claim 1, characterized in that, The control system is further configured to shut down the cooling function of the chilled water system before the set shutdown time is a first set time earlier than the set shutdown time; Detect whether the required temperature in the area where the intelligent air conditioning system is located is greater than the threshold temperature; If so, then proceed with the step of shutting down the cooling function of the chilled water system at the pre-shutdown time; If not, then increase the outlet water temperature of the cold water system; Determine whether the outlet water temperature of the cold water system is lower than the fourth set temperature, and whether the indoor temperature is lower than the fifth set temperature; If so, the cooling function of the cold water system will be turned off by a third preset time before the set shutdown time, and the outlet water temperature of the cold water system will be increased in the next operation. If not, then reduce the outlet water temperature of the cold water system until the outlet water temperature of the cold water system is lower than the fourth set temperature and the indoor temperature is lower than the fifth set temperature.

4. The intelligent air conditioning system according to any one of claims 1 to 3, characterized in that, The cooling water system includes: Cooling tower assembly; A cooling pump unit, the input end of which is connected to the output end of the cooling tower unit; The chiller unit has a first input terminal connected to the output terminal of the cooling pump unit, a first output terminal connected to the input terminal of the cooling tower unit, and a second output terminal connected to the input terminal of the fan coil unit. A chilled water pump unit, wherein the input end of the chilled water pump unit is connected to the output end of the fan coil unit, and the output end of the chilled water pump unit is connected to the second input end of the chiller unit; The control system is communicatively connected to the cooling tower group, the cooling pump group, the chiller group, and the refrigeration pump group; The control system is configured to: shut down the cooling function of the chilled water system, specifically to: shut down the chiller unit and keep the cooling tower group, cooling pump group and chilled water pump group running continuously.

5. The intelligent air conditioning system according to claim 4, characterized in that, The control system is configured to shut down the chiller unit while maintaining continuous operation of the cooling tower group, cooling pump group, and chilled water pump group, specifically configured as follows: The frequency of the cooling pump group is adjusted according to the temperature difference between the cooling supply and return water, and the frequency of the chilled water pump group is adjusted according to the pressure difference between the chilled water supply and return water.

6. The intelligent air conditioning system according to claim 5, characterized in that, The control system is configured to: shut down the chiller unit while maintaining the continuous operation of the cooling tower group, cooling pump group, and chilled water pump group; specifically, it is further configured to: Determine whether the outlet water temperature of the cooling tower group is within the third temperature range of the wet-bulb temperature. If yes, control the number of operating cooling tower groups to remain unchanged; if no, adjust the number of operating cooling tower groups until the outlet water temperature of the cooling tower group is within the third temperature range of the wet-bulb temperature.

7. The intelligent air conditioning system according to claim 1, characterized in that, The control system is configured to control the chilled water system to shut down a new time before the set shutdown time, specifically configured as follows: Shut down the chiller unit, cooling tower unit, cooling pump unit, and chilled water pump unit.

8. A control method for an intelligent air conditioning system, characterized in that, The control method, applied to any one of claims 1 to 7, comprises: The control system obtains the set shutdown time for the area where the intelligent air conditioning system is located; The control system shuts down the cooling function of the cold water system by a pre-set time before the set shutdown time. The control system acquires the outlet water temperature of the cold water system and the indoor temperature of the area where the intelligent air conditioning system is located. The control system determines whether the outlet water temperature of the cold water system is lower than the first set temperature and whether the indoor temperature is lower than the second set temperature. If so, then the new early shutdown time is obtained by advancing the early shutdown time by a second set time, and the new early shutdown time is used as the time for the next shutdown of the cooling function of the cold water system; The control system controls the chilled water system to shut down a new time before the set shutdown time.

9. The control method for the intelligent air conditioning system according to claim 8, characterized in that, The control method further includes: The control system obtains the outlet water temperature of the chilled water system and the indoor temperature of the area where the intelligent air conditioning system is located based on the previously acquired early shutdown time and the period during which the cooling function of the chilled water system is turned off. The control system determines whether the outlet water temperature of the cold water system is lower than the first set temperature and whether the indoor temperature is lower than the second set temperature. If so, the new early shutdown time is obtained by advancing the second set time before the previously obtained early shutdown time, and the new early shutdown time is used as the time to shut down the cooling function of the cold water system next time. If not, the two previously obtained early shutdown times will be used as the time for the next shutdown of the cooling function of the chilled water system.

10. The control method for the intelligent air conditioning system according to claim 9, characterized in that, The control method further includes: Before the set shutdown time is a first set time earlier than the set shutdown time, the control system shuts down the cooling function of the chilled water system; the control system detects whether the required temperature of the area where the intelligent air conditioning system is located is greater than the threshold temperature. If so, then proceed with the step of shutting down the cooling function of the chilled water system at the pre-shutdown time; If not, then increase the outlet water temperature of the cold water system; The control system determines whether the outlet water temperature of the cold water system is lower than the fourth set temperature and whether the indoor temperature is lower than the fifth set temperature. If so, the cooling function of the cold water system will be turned off by a third preset time before the set shutdown time, and the outlet water temperature of the cold water system will be increased in the next operation. If not, then reduce the outlet water temperature of the cold water system until the outlet water temperature of the cold water system is lower than the fourth set temperature and the indoor temperature is lower than the fifth set temperature.

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