A refrigeration system based on 5G application and a control method thereof

Abstract

The application discloses a refrigeration system based on 5G application and a control method thereof. The control method comprises the following steps: controlling a cold water host unit to start running, acquiring a real-time enthalpy Hw, setting an initial outlet water temperature setting value T0 of the cold water host unit according to a comparison result of Hw, Hh and Hl, and Th and Tl; acquiring a real-time enthalpy Hw fed back by an outdoor enthalpy sensor at every preset time interval Ia, calculating an outlet water temperature setting value Tx corresponding to each time interval according to T x‑1 , H w‑1 , preset Th, Tl, Hh, Hl, Hw and real-time working conditions of air conditioner terminals fed back by a plurality of area controllers, adjusting the working state of the cold water host unit according to the calculated Tx; and the control method can regularly adjust the outlet water temperature setting value of the cold water host unit, so that the cold water host unit does not use a lower outlet water temperature setting value when the load is low, and the working energy consumption of the cold water host unit is reduced under the premise of guaranteeing the cold quantity demand of the controlled area.

Description

Technical Field

[0001] This invention relates to the field of chiller control technology, and in particular to a refrigeration system and its control method based on 5G applications. Background Technology

[0002] Currently, central air conditioning systems commonly use water-cooled / air-cooled chillers as the cooling source. During the actual operation of the chiller, adjustments are generally required based on a pre-set chilled water outlet temperature. This pre-set temperature is often determined by the chiller manufacturer under standard operating conditions, such as 7°C. However, the actual load on the air conditioning terminals varies depending on the indoor load and outdoor environment. Therefore, using a fixed standard operating condition outlet temperature setting can easily cause the chiller to output more cooling capacity than the actual cooling capacity required by the air conditioning terminals, resulting in energy waste. In other words, existing chillers have high energy consumption during actual operation.

[0003] It is evident that existing technologies still need improvement and enhancement. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide a refrigeration system based on 5G applications, which can realize the periodic adjustment of the outlet water temperature set value of the chiller, and greatly reduce the working energy consumption of the chiller.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A control method for a refrigeration system based on 5G applications, the refrigeration system including a control platform and an outdoor enthalpy sensor, a chiller unit, and several area controllers respectively communicatively connected to the control platform; the control method includes the following steps:

[0007] Obtain the preset upper limit value of water outlet temperature Th, the preset lower limit value of water outlet temperature Tl, the preset upper limit value of air enthalpy Hh, the preset lower limit value of air enthalpy Hl, and the preset time interval Ia;

[0008] The system starts operating the chiller unit, acquires the real-time enthalpy value Hw from the outdoor enthalpy sensor, compares the real-time enthalpy value Hw with the preset upper limit enthalpy value Hh and the preset lower limit enthalpy value Hl, and sets the initial outlet water temperature setpoint T0 of the chiller unit according to the preset upper limit enthalpy value Th and the preset lower limit enthalpy value Tl.

[0009] When the preset time interval Ia is reached, the real-time enthalpy value Hw fed back by the outdoor enthalpy sensor is obtained, and the outlet water temperature setpoint T of the previous cycle is used as the reference. x-1 The real-time enthalpy value H of the previous periodw-1 The preset Th, Tl, Hh and Hl, real-time enthalpy value Hw, and real-time operating condition calculations of the air conditioning terminals fed back by several regional controllers, as well as the outlet water temperature setpoint Tx corresponding to each time interval;

[0010] Adjust the operating status of the chiller unit according to the calculated outlet water temperature setpoint Tx.

[0011] In the control method of the 5G-based refrigeration system, the chiller unit is started to operate, and the real-time enthalpy value Hw fed back by the outdoor enthalpy sensor is acquired. Based on the comparison results of the real-time enthalpy value Hw with the preset upper limit enthalpy value Hh and the preset lower limit enthalpy value Hl, and based on the preset upper limit enthalpy value Th and the preset lower limit enthalpy value Tl, the initial outlet water temperature setpoint T0 of the chiller unit is set. Specifically, this includes:

[0012] When Hw≥Hh, T0=TL;

[0013] When HL < Hw < Hh

[0014] When Hw≤HL, T0=Th.

[0015] In the control method of the 5G-based cooling system, when a preset time interval Ia is reached, the real-time enthalpy value Hw fed back by the outdoor enthalpy sensor is obtained, and the outlet water temperature setpoint T of the previous cycle is used as the reference. x-1 The real-time enthalpy value H of the previous period w-1 The preset Th, Tl, Hh, and Hl, real-time enthalpy value Hw, and real-time operating condition calculations of the air conditioning terminals fed back by several area controllers, along with the corresponding outlet water temperature setpoint Tx for each time interval, specifically include:

[0016] When the preset time interval Ia is reached, the real-time enthalpy value Hw fed back by the outdoor enthalpy sensor is obtained.

[0017] Calculate the outlet water temperature setpoint Tx corresponding to each time interval.

[0018] T x =T x-1 -b+a*Δt;

[0019] Among them, T x-1 The value of b is based on the outlet water temperature setpoint of the previous cycle, and the value of b is based on the real-time enthalpy value H of the previous cycle. w-1 And the preset Th, Tl, Hh and Hl are confirmed; the value of a is determined based on the real-time operating conditions of the air conditioning terminals fed back by several regional controllers; Δt is the preset step temperature adjustment value, Δt=0.5.

[0020] In the control method of the 5G-based cooling system, after calculating the outlet water temperature setpoint Tx corresponding to each time interval, the method further includes the following steps:

[0021] When Tx > Th, take Tx = Th;

[0022] When Tx < Tl, take Tx = Tl.

[0023] In the control method of the 5G-based cooling system, the value of b is based on the real-time enthalpy value H of the previous cycle. w-1 And the preset Th, Tl, Hh, and Hl confirmations, specifically including:

[0024]

[0025] Among them, H w-1 This is the real-time enthalpy value of the previous cycle.

[0026] In the control method of the 5G-based cooling system, several area controllers can control K air conditioning terminals. The value of 'a' is determined based on the real-time operating conditions of the air conditioning terminals fed back by the several area controllers, specifically including:

[0027] Obtain the preset return air temperature setpoint Sk corresponding to the air conditioning terminal;

[0028] Every Ia / 5 minutes, obtain the real-time return air temperature mk corresponding to the air conditioning terminal;

[0029] Based on the comparison between the real-time return air temperature mk and the preset return air temperature setpoint Sk, confirm the cooling status indication parameter fk corresponding to the air conditioning terminal.

[0030] Based on the value of the cooling status indicator parameter fk of K air conditioning terminals and the number of air conditioning terminals corresponding to the value, determine the value of a.

[0031] In the control method of the 5G-based cooling system, the step of confirming the cooling status indication parameter fk corresponding to the air conditioning terminal based on the comparison result between the real-time return air temperature mk and the preset return air temperature setpoint Sk specifically includes:

[0032] The real-time return air temperatures obtained include five values, which are designated as mk1, mk2, mk3, mk4 and mk5 respectively.

[0033] When Sk≤mk5≤(Sk+d), take fk=1;

[0034] When mk5 > (Sk + d), and when any two or more values ​​of mk2, mk3, mk4, mk5 are less than or equal to mk1, fk = 1; otherwise, fk = 0.

[0035] When mk5 < Sk, take fk = 2;

[0036] Where d is the allowable deviation value of air conditioning temperature, d = 1℃.

[0037] In the control method for the 5G-based cooling system, the step of determining the value of 'a' based on the value of the cooling status indication parameter 'fk' of K air conditioning terminals and the number of air conditioning terminals corresponding to the value specifically includes:

[0038] When the proportion of air conditioning terminals with fk≥1 is ≥90%, if the proportion of air conditioning terminals with fk=2 is ≥60%, then a=1; if the proportion of air conditioning terminals with fk=2 is <60%, then a=0.

[0039] When the proportion of air conditioning terminals with fk≥1 is ≥75% and <90%, take a=0;

[0040] When the proportion of air conditioning terminals with fk≥1 is <75%, take a=-1.

[0041] The present invention also discloses a refrigeration system based on 5G applications. The refrigeration system uses any of the control methods described above to achieve operation control. The refrigeration system includes a control platform and an outdoor enthalpy sensor, a chiller unit, and several area controllers that are respectively connected to the control platform.

[0042] In the 5G-based refrigeration system, the outdoor enthalpy sensor includes a first 5G module, the area controller includes a second 5G module and a first communication interface, the control platform includes a third 5G module, the chiller unit includes a regulating actuator and several chillers, the regulating actuator includes a fourth 5G module and a second communication structure, and the chiller includes a third communication interface; the first 5G module, the second 5G module, and the fourth 5G module are wirelessly connected to the third 5G module; the second communication interface is connected to the third communication interface; the first communication interface is used to obtain the real-time operating status of the air conditioning terminal.

[0043] Beneficial effects:

[0044] This invention provides a 5G-based cooling system that can periodically adjust the outlet water temperature setpoint of the chiller unit, preventing the chiller unit from using a lower outlet water temperature setpoint when the load is low. Under the premise of ensuring the cooling capacity requirements of the controlled area and ensuring that the controlled area is within a reasonable temperature and humidity range, the operating energy consumption of the chiller unit can be greatly reduced, thereby achieving the purpose of energy saving and cost reduction. Attached Figure Description

[0045] Figure 1A first logic flowchart of the control method provided by the present invention;

[0046] Figure 2 A second logic flowchart of the control method provided by the present invention;

[0047] Figure 3 The system structure diagram of the refrigeration system provided by the present invention;

[0048] Figure 4 The system structure diagram of the chiller unit provided by the present invention.

[0049] Explanation of key component symbols: 1-Control platform, 2-Outdoor enthalpy sensor, 31-Chiller unit, 32-Regulator actuator, 33-Chiller water pump, 34-Water distributor, 35-Water collector, 4-Zone controller, 41-Air conditioning terminal. Detailed Implementation

[0050] This invention provides a cooling system and its control method based on 5G applications. To make the objectives, technical solutions and effects of this invention clearer and more explicit, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0051] In the description of this invention, it should be understood that the terms "installation" and "connection" should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0052] Please see Figure 1 This invention provides a control method for a refrigeration system based on 5G applications. The refrigeration system includes a control platform 1, an outdoor enthalpy sensor 2, a chiller unit, and several area controllers 4, all communicatively connected to the control platform 1. The control method includes the following steps:

[0053] 101. Obtain the preset upper limit value of water outlet temperature Th, the preset lower limit value of water outlet temperature Tl, the preset upper limit value of air enthalpy Hh, the preset lower limit value of air enthalpy Hl, and the preset time interval Ia;

[0054] In this embodiment, the preset upper limit of outlet water temperature Th, the preset lower limit of outlet water temperature Tl, the preset upper limit of air enthalpy Hh, the preset lower limit of air enthalpy Hl, and the preset time interval Ia are preset by the staff according to the operating conditions of the chiller unit and fed back to the control platform 1. Each preset value can be modified during the operation of the chiller unit. The default value of TL is 7℃, the default value of Th is 12℃, the default value of Ia is 20 minutes, the default value of Hh is 99kj / kg, and the default value of HL is 54kj / kg.

[0055] 102. Control the chiller unit to start running, obtain the real-time enthalpy value Hw fed back by the outdoor enthalpy sensor 2, compare the real-time enthalpy value Hw with the preset upper limit enthalpy value Hh and the preset lower limit enthalpy value Hl, and set the initial outlet water temperature set value T0 of the chiller unit according to the preset upper limit enthalpy value Th and the preset lower limit enthalpy value Tl.

[0056] In this embodiment, during the initial operation of the chiller unit, the initial outlet water temperature setpoint T0 is first set according to Hh, Hl, Th and Tl. When the chiller unit has been running for a time interval, i.e. 20 minutes, the outlet water temperature setpoint Tx is recalculated.

[0057] 103. When the preset time interval Ia is reached, acquire the real-time enthalpy value Hw fed back by the outdoor enthalpy sensor 2, and adjust the water outlet temperature setpoint T from the previous cycle. x-1 The real-time enthalpy value H of the previous period w-1 The preset Th, Tl, Hh and Hl, real-time enthalpy value Hw and real-time operating condition calculation of air conditioning terminal 41 fed back by several area controllers 4 and the outlet water temperature set value Tx corresponding to each time interval.

[0058] In this embodiment, when the chiller unit starts up, the initial outlet water temperature setpoint is T0. After the first cycle time, the outlet water temperature setpoint is T. x1 The set value for the outlet water temperature after the second cycle is T. x2 And so on, after the xth (x≥1) cycle time, the outlet water temperature setpoint is Tx; the main purpose of this application is to determine a reasonable Tx value at the beginning of each cycle so as to realize the periodic adjustment of the outlet water temperature setpoint of the chiller unit.

[0059] 104. Adjust the operating status of the chiller unit according to the calculated outlet water temperature setpoint Tx;

[0060] In this embodiment, after the control platform 1 calculates the outlet water temperature setpoint Tx, it feeds back the outlet water temperature setpoint Tx to the regulating controller included in the chiller unit to control and adjust the working state of the chiller 31.

[0061] This application discloses a control method for a refrigeration system based on 5G applications. Every time time interval Ia is reached, the outlet water temperature setpoint Tx is recalculated, which can periodically adjust the outlet water temperature setpoint of the chiller unit. This avoids the chiller unit 31 using a lower outlet water temperature setpoint when the load is low. Under the premise of ensuring the cooling capacity requirement of the controlled area and ensuring that the controlled area is within a reasonable temperature and humidity range, the operating energy consumption of the chiller unit 31 can be greatly reduced, thereby achieving the purpose of energy saving and cost saving.

[0062] Furthermore, the chiller unit is started to operate, and the real-time enthalpy value Hw is obtained from the outdoor enthalpy sensor 2. Based on the comparison results between the real-time enthalpy value Hw and the preset upper limit enthalpy value Hh and the preset lower limit enthalpy value Hl, the initial outlet water temperature setpoint T0 of the chiller unit is set according to the preset upper limit enthalpy value Th and the preset lower limit enthalpy value Tl. Specifically, this includes:

[0063] When Hw≥Hh, T0=TL;

[0064] When HL < Hw < Hh

[0065] When Hw≤HL, T0=Th.

[0066] Furthermore, when the preset time interval Ia is reached, the real-time enthalpy value Hw fed back by the outdoor enthalpy sensor 2 is obtained, and the water outlet temperature setpoint T of the previous cycle is used as the reference. x-1 The real-time enthalpy value H of the previous period w-1 The preset Th, Tl, Hh and Hl, real-time enthalpy value Hw, and real-time operating condition calculations of the air conditioning terminal 41 fed back by several area controllers 4, and the corresponding outlet water temperature setpoint Tx for each time interval, specifically include:

[0067] When the preset time interval Ia is reached, the real-time enthalpy value Hw fed back by the outdoor enthalpy sensor 2 is obtained.

[0068] Calculate the outlet water temperature setpoint Tx corresponding to each time interval.

[0069] T x =T x-1 -b+a*Δt;

[0070] Among them, T x-1 The value of b is based on the outlet water temperature setpoint of the previous cycle, and the value of b is based on the real-time enthalpy value H of the previous cycle. w-1 And the preset Th, Tl, Hh and Hl are confirmed; the value of a is determined based on the real-time operating conditions of the air conditioning terminal 41 fed back by several area controllers 4; Δt is the preset step temperature adjustment value, Δt=0.5.

[0071] In this embodiment, when the first time interval Ta is reached, i.e., during the second operating cycle, the outlet water temperature setpoint T of the previous cycle is used to calculate the outlet water temperature setpoint Tx. x-1 It is T0.

[0072] Furthermore, the calculation of the outlet water temperature setpoint Tx corresponding to each time interval further includes the following steps:

[0073] When Tx > Th, take Tx = Th;

[0074] When Tx < Tl, take Tx = Tl;

[0075] In this embodiment, the calculated outlet water temperature setpoint Tx should fall within the preset outlet water temperature setpoint range, i.e., Tl < Tx < Th, to ensure that the chiller unit can operate safely and stably.

[0076] Furthermore, the value of b is based on the real-time enthalpy value H of the previous period. w-1 And the preset Th, Tl, Hh, and Hl confirmations, specifically including:

[0077]

[0078] Among them, H w-1 This is the real-time enthalpy value of the previous cycle.

[0079] Further, please refer to Figure 2 Several area controllers 4 can control K air conditioning terminals 41. The value of 'a' is determined based on the real-time operating status of the air conditioning terminals 41 fed back by the several area controllers 4, specifically including:

[0080] 201. Obtain the preset return air temperature setpoint Sk corresponding to the air conditioning terminal 41;

[0081] 202. Every Ia / 5 minutes, obtain the real-time return air temperature mk corresponding to the air conditioning terminal 41;

[0082] In this embodiment, Ia is 20 minutes, that is, the real-time return air temperature mk is acquired every 4 minutes, and a total of 5 real-time return air temperatures are acquired within a 20-minute time period.

[0083] 203. Based on the comparison between the real-time return air temperature mk and the preset return air temperature setpoint Sk, confirm the cooling status indication parameter fk corresponding to the air conditioning terminal 41.

[0084] In this embodiment, a cooling status indicator f is set for each air conditioner terminal 41. Assuming there are K air conditioner terminals 41, the cooling status indicators for the corresponding air conditioner terminals 41 are f1, f2, ..., fk, where k ≥ 1. fk has only three values: 0, 1, and 2, and the indicator is only valid when the corresponding air conditioner terminal 41 is running. Specifically, when fk = 0, it indicates that the corresponding air conditioner terminal 41 is not cooling enough; when fk = 1, it indicates that the cooling is effective; and when fk = 2, it indicates that the cooling is excessive.

[0085] 204. Based on the value of the cooling status indication parameter fk of K air conditioning terminal 41 and the number of air conditioning terminals 41 corresponding to the value, confirm the value of a.

[0086] Furthermore, the step of confirming the cooling status indication parameter fk corresponding to the air conditioning terminal 41 based on the comparison result between the real-time return air temperature mk and the preset return air temperature setpoint Sk specifically includes:

[0087] The acquired real-time return air temperatures include five values, designated as mk1, mk2, mk3, mk4, and mk5, respectively. mk1 is the earliest real-time return air temperature value within the cycle, and mk5 is the latest real-time return air temperature value.

[0088] When Sk≤mk5≤(Sk+d), take fk=1;

[0089] When mk5 > (Sk + d), and when any two or more values ​​of mk2, mk3, mk4, mk5 are less than or equal to mk1, fk = 1; otherwise, fk = 0.

[0090] When mk5 < Sk, take fk = 2;

[0091] Where d is the allowable deviation value of air conditioning temperature, d = 1℃.

[0092] Further, the step of determining the value of 'a' based on the value of the cooling status indication parameter fk of K air conditioning terminals 41 and the number of air conditioning terminals 41 corresponding to the value specifically includes:

[0093] When the proportion of air conditioning terminals 41 with fk≥1 is ≥90%, if the proportion of air conditioning terminals 41 with fk=2 is ≥60%, then a=1; if the proportion of air conditioning terminals 41 with fk=2 is <60%, then a=0.

[0094] When the proportion of air conditioning terminals 41 with fk≥1 is ≥75% and <90%, take a=0;

[0095] When the proportion of air conditioning terminals 41 with fk≥1 is <75%, take a=-1;

[0096] In this embodiment, the aforementioned percentage values ​​of 60%, 75%, and 90% are merely preset values ​​and can be modified according to the debugging and operation situation; the value of 'a' is only -1, 0, and 1.

[0097] In this embodiment, when the chiller unit includes multiple chillers 31, the outlet water temperature setpoint of the multiple chillers 31 is processed to be consistent with the calculated outlet water temperature setpoint.

[0098] Please see Figure 3 and Figure 4The present invention also discloses a refrigeration system based on 5G applications. The refrigeration system uses any of the control methods described above to achieve operation control. The refrigeration system includes a control platform 1 and an outdoor enthalpy sensor 2, a chiller unit, and several area controllers 4, which are respectively connected to the control platform 1 in communication.

[0099] In this embodiment, the area controller 4 is responsible for collecting the return air temperature, temperature setpoint, and operating status of each air conditioning terminal 41 within its area, and uploading this data to the control platform 1 via a 5G signal. Additionally, the area controller 4 also sets a lower limit for the area's cooling temperature setpoint to ensure that the cooling temperature setpoint of each air conditioning terminal 41 does not fall below the lower limit. The outdoor enthalpy sensor 2 is responsible for detecting the real-time enthalpy value Hw of the outdoor air and uploading it to the control platform 1 via a 5G signal. The regulating actuator 32 is responsible for receiving the outlet water temperature setpoint from the control platform 1 and... The outlet water temperature setpoint is sent to each chiller 31, and the current operating information of each chiller 31 (including fault status, temperature setpoint, main operating parameters, etc.) is collected and fed back to the control platform 1. The control platform 1 is a cloud platform. The control platform 1 receives and stores the operating information of all air conditioning terminals 41 in each area, outdoor air enthalpy value and chiller 31 operating information uploaded through 5G signal. It calculates the current required outlet water temperature setpoint of the chiller 31 according to certain rules and sends it to the regulating actuator 32 of the chiller unit.

[0100] Further, please refer to Figure 3 The outdoor enthalpy sensor 2 includes a first 5G module, the area controller 4 includes a second 5G module and a first communication interface, the control platform 1 includes a third 5G module, the chiller unit includes a regulating actuator 32 and several chiller units 31, the regulating actuator 32 includes a fourth 5G module and a second communication structure, and the chiller unit 31 includes a third communication interface; the first 5G module, the second 5G module and the fourth 5G module are wirelessly connected to the third 5G module; the second communication interface is connected to the third communication interface; the first communication interface is used to obtain the real-time operating status of the air conditioning terminal 41.

[0101] In this embodiment, please refer to Figure 4 The chiller unit also includes a water distributor 34, a water collector 35, and a chilled water pump 33. The chiller 31 is connected to the water supply pipes of multiple air conditioning terminals 41 through the water distributor 34, and the return water pipes of the multiple air conditioning terminals 41 are connected to the chiller 31 through the water collector 35 and the chilled water pump 33.

[0102] The 5G-based cooling system disclosed in this application utilizes the fast and real-time characteristics of the 5G network to quickly collect information such as return air temperature, temperature setpoint, operating status, and outdoor air enthalpy of each air conditioning terminal 41 in each controlled area while minimizing on-site wiring. The system operation data is transmitted to the control platform 1 in real time via the 5G network. Within certain limits, the control platform 1 calculates an appropriate outlet water temperature setpoint for the chiller 31 based on the outdoor air enthalpy and the overall load of the indoor air conditioning terminals 41, and sends the setpoint to the chiller unit's regulating actuator 32 via a 5G signal. This prevents the chiller 31 from using a lower outlet water temperature setpoint when the load is low, thereby reducing the energy consumption of the chiller 31 while ensuring the cooling capacity requirements of the controlled area, thus achieving energy and cost savings.

[0103] It is understood that those skilled in the art can make equivalent substitutions or changes to the technical solution and inventive concept of the present invention, and all such changes or substitutions should fall within the protection scope of the present invention.

Claims

1. A control method for a refrigeration system based on 5G applications, characterized in that, The refrigeration system includes a control platform and an outdoor enthalpy sensor, a chiller unit, and several zone controllers, all of which are communicatively connected to the control platform; the control method includes the following steps: Obtain the preset upper limit value of water outlet temperature Th, the preset lower limit value of water outlet temperature Tl, the preset upper limit value of air enthalpy Hh, the preset lower limit value of air enthalpy Hl, and the preset time interval Ia; The chiller unit is started to operate. The real-time enthalpy value Hw is obtained from the outdoor enthalpy sensor. The real-time enthalpy value Hw is compared with the preset upper limit enthalpy value Hh and the preset lower limit enthalpy value Hl. The initial outlet water temperature setpoint T0 of the chiller unit is set according to the preset upper limit enthalpy value Hh, the preset lower limit enthalpy value Hl, the preset upper limit enthalpy value Th, and the preset lower limit enthalpy value Tl. When the preset time interval Ia is reached, the real-time enthalpy value Hw fed back by the outdoor enthalpy sensor is obtained, and the setpoint for the outlet water temperature corresponding to each time interval is calculated. , ,in, The value of b is based on the outlet water temperature setpoint of the previous cycle and the real-time enthalpy value Hw of the previous cycle. The preset upper limit enthalpy value of air Hh, the preset lower limit enthalpy value of air Hl, the preset upper limit value of outlet water temperature Th, and the preset lower limit value of outlet water temperature Tl are determined. The value of a is determined based on the real-time operating conditions of the air conditioning terminals fed back by several regional controllers. The preset step temperature adjustment value, ; Based on the calculated outlet water temperature setpoint Adjust the operating status of the chiller unit; Among them, several area controllers can control K air conditioning terminals, and the value of 'a' is determined based on the real-time operating conditions of the air conditioning terminals fed back by the several area controllers, including: Obtain the preset return air temperature setpoint Sk corresponding to the air conditioning terminal; Every Ia / 5 minutes, obtain the real-time return air temperature mk corresponding to the air conditioning terminal; Based on the comparison between the real-time return air temperature mk and the preset return air temperature setpoint Sk, the cooling status indication parameter fk corresponding to the air conditioning terminal is determined. The value of a is determined based on the value of the cooling status indication parameter fk of K air conditioning terminals and the number of air conditioning terminals corresponding to the value.

2. The control method for a 5G-based cooling system according to claim 1, characterized in that, The control system starts the chiller unit, acquires the real-time enthalpy value Hw from the outdoor enthalpy sensor, compares the real-time enthalpy value Hw with preset upper air limit enthalpy value Hh and preset lower air limit enthalpy value Hl, and sets the initial outlet water temperature setpoint T0 of the chiller unit based on the preset upper air limit enthalpy value Hh, preset lower air limit enthalpy value Hl, preset upper outlet water temperature limit Th, and preset lower outlet water temperature limit Tl, including: When Hw≥Hh, T0=Tl; When Hl < Hw < Hh ; When Hw≤Hl, T0=Th.

3. The control method for a 5G-based cooling system according to claim 1, characterized in that, The calculation corresponds to the setpoint for the outlet water temperature at each time interval. The following steps are also included: when When >Th, take =Th; when When <Tl, take =Tl.

4. The control method for a 5G-based cooling system according to claim 1, characterized in that, The formula for determining b is: 。 5. The control method for a 5G-based cooling system according to claim 1, characterized in that, The step of determining the cooling status indication parameter fk corresponding to the air conditioning terminal based on the comparison result between the real-time return air temperature mk and the preset return air temperature setpoint Sk includes: The real-time return air temperatures obtained include five values, which are designated as mk1, mk2, mk3, mk4 and mk5 respectively. When Sk≤mk5≤(Sk+d), take fk=1; When mk5 > (Sk + d), and when any two or more values ​​of mk2, mk3, mk4, mk5 are less than or equal to mk1, fk = 1; otherwise, fk = 0. When mk5 < Sk, take fk = 2; Where d is the allowable deviation value of air conditioning temperature, d=1℃.

6. The control method for a 5G-based cooling system according to claim 5, characterized in that, The step of determining the value of 'a' based on the value of the cooling status indication parameter 'fk' of K air conditioning terminals and the number of air conditioning terminals corresponding to the value includes: When the proportion of air conditioning terminals with fk≥1 is ≥90%, and the proportion of air conditioning terminals with fk=2 is ≥60%, then a=1. If the proportion of air conditioning terminals with fk=2 is less than 60%, then a=0; When the proportion of air conditioning terminals with fk≥1 is ≥75% and <90%, then a=0; When the proportion of air conditioning terminals with fk≥1 is <75%, then a=-1.

7. A cooling system based on 5G applications, characterized in that, The refrigeration system employs the control method described in any one of claims 1-6 to achieve operational control. The refrigeration system includes a control platform and an outdoor enthalpy sensor, a chiller unit, and several area controllers, all of which are communicatively connected to the control platform.

8. A 5G-based cooling system according to claim 7, characterized in that, The outdoor enthalpy sensor includes a first 5G module, the area controller includes a second 5G module and a first communication interface, the control platform includes a third 5G module, the chiller unit includes a regulating actuator and several chillers, the regulating actuator includes a fourth 5G module and a second communication interface, and the chiller includes a third communication interface; the first 5G module, the second 5G module, and the fourth 5G module are wirelessly connected to the third 5G module; the second communication interface is connected to the third communication interface; the first communication interface is used to obtain the real-time operating status of the air conditioning terminal.

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