Intelligent air conditioning system and control method

Abstract

The embodiment of the invention provides an intelligent air conditioning system and a control method, and relates to the technical field of air conditioners. The system realizes energy conservation and emission reduction by closing the refrigeration function in advance. The intelligent air conditioning system comprises a water cooling machine room system and a control system. The control system is further configured to obtain the set closing time of the area where the intelligent air conditioning system is located; closing the refrigeration function of the cold water system at an advanced closing time which is earlier than the set closing time by a first set time; the outlet water temperature of the cold water system and the indoor temperature of the area where the intelligent air-conditioning system is located are obtained; judging whether the outlet water temperature of the cold water system is lower than a first set temperature and whether the indoor temperature is lower than a second set temperature; if yes, advancing the advanced closing time by a second set time to obtain a new advanced closing time, and taking the new advanced closing time as the time for closing the refrigeration function of the cold water system next time; and controlling the cold water system to be closed at the set closing time.

Description

Technical Field

[0001] The present invention relates to the field of air conditioning, and in particular to an intelligent air conditioning system and a control method. Background Art

[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. Energy conservation and emission reduction are imperative, and low-carbon development has become an inevitable trend in social development.

[0003] Shopping malls, office buildings, libraries and other large public buildings usually shut down their smart air-conditioning systems when they are closed. At this time, the remaining cold in the chilled water pipes after the shutdown is no longer useful and is 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 in air-conditioning automation system control technology. Summary of the invention

[0005] The embodiment of the present application provides an intelligent air-conditioning system and a control method, which achieves the purpose of saving energy and improving energy utilization by shutting down the chiller in advance.

[0006] In a first aspect, an embodiment of the present application provides an intelligent air-conditioning system.

[0007] The intelligent air conditioning system includes: a chiller room system and a control system. The chiller room system includes: a fan coil unit and a chilled water system. The fan coil unit is used to cool the area where it is located. The chilled water system is connected to the fan coil unit. Water circulates between the chilled water system and the fan coil unit. The chilled water system has a refrigeration function.

[0008] The control system is electrically connected to the cold water system, and the control system is configured to control the cold water system to be turned on or off; the control system is also configured to: obtain the set closing time of the area where the intelligent air-conditioning system is located; advance the closing time by a first set time before the set closing time to turn off the refrigeration function of the cold water system; 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, advance the advance closing time by the second set time to obtain a new advance closing time, and use the new advance closing time as the time to turn off the refrigeration function of the cold water system next time; control the cold water system to be closed at the set closing time.

[0009] Based on the above technical solution, the intelligent air-conditioning system provided in some embodiments of the present application can effectively reduce building energy consumption and improve energy efficiency by shutting down the chiller in advance, making full use of the residual cooling of the chilled water, and using the control system to determine the best time for early shutdown.

[0010] In some embodiments, the control system is further configured to: at the previously acquired advance closing time, shut down the refrigeration function of the cold water system for a period of 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 a first set temperature, and whether the indoor temperature is lower than a second set temperature; if so, advance the previously acquired advance closing time by the second set time to obtain a new advance closing time, and use the new advance closing time as the next time to shut down the refrigeration function of the cold water system; if not, use the first two acquired advance closing times as the next time to shut down the refrigeration function of the cold water system.

[0011] In some embodiments, the control system is further configured to: before turning off the refrigeration function of the cold water system at an advance closing time that is a first set time ahead of the set closing time; detect whether the demand 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 refrigeration function of the cold water system at the advance closing time; if not, increase the outlet water temperature of the cold water system; determine whether the outlet water temperature of the cold water system is lower than a fourth set temperature, and whether the indoor temperature is lower than a fifth set temperature; if so, turn off the refrigeration function of the cold water system at an advance closing time that is a third set time ahead of the set closing time, and increase the outlet water temperature of the cold water system next time; if not, 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.

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

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

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

[0015] In some embodiments, the control system is configured to: shut down the chiller and keep the cooling tower group, cooling pump group and refrigeration pump group running continuously, and is specifically configured to: determine whether the outlet water temperature of the cooling tower group is within the third temperature range of the wet-bulb temperature, and if so, control the operating number of the cooling tower group to remain unchanged; if not, adjust the operating number of the cooling tower group 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 at the set shut-down time, and is specifically configured to: shut down the chiller, the cooling tower group, the cooling pump group, and the refrigeration pump group.

[0017] In a second aspect, some embodiments of the present application provide a control method for an intelligent air-conditioning system.

[0018] The control method includes: the control system obtains the set shutdown time of the area where the intelligent air-conditioning system is located; the control system advances the set shutdown time by a first set time to turn off the refrigeration function of the cold water system; the control system obtains 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, the advance shutdown time is advanced by the second set time to obtain a new advance shutdown time, and the new advance shutdown time is used as the time for next shutting down the refrigeration function of the cold water system; the control system controls the cold water system to shut down at the set shutdown time.

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

[0020] In some embodiments, the control method also includes: the control system uses the advance closing time obtained last time to shut down the refrigeration function of the cold water system for a period of time, obtains 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 a first set temperature, and whether the indoor temperature is lower than a second set temperature; if so, the advance closing time obtained last time is advanced by the second set time to obtain a new advance closing time, and the new advance closing time is used as the time for shutting down the refrigeration function of the cold water system next time; if not, the advance closing times obtained the first two times are used as the time for shutting down the refrigeration function of the cold water system next time.

[0021] In some embodiments, the control method also includes: the control system turns off the refrigeration function of the cold water system before the set closing time is advanced by a first set time; the control system detects whether the demand temperature of the area where the intelligent air-conditioning system is located is greater than a threshold temperature; if so, executes the step of turning off the refrigeration function of the cold water system at the advanced closing time; if not, increases 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 a fourth set temperature, and whether the indoor temperature is lower than a fifth set temperature; if so, turns off the refrigeration function of the cold water system before the set closing time is advanced by a third set time, and increases the outlet water temperature of the cold water system next time; if not, reduces 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0023] Figure 1 A structural block diagram of an intelligent air conditioning system provided by an embodiment of the present invention;

[0024] Figure 2 A partial flow chart of a control method provided by an embodiment of the present invention;

[0025] Figure 3 Another partial flow chart of a control method provided by an embodiment of the present invention;

[0026] Figure 4 An overall flow chart of a control method provided by an embodiment of the present invention;

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

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

[0029] Figure 7 A schematic diagram of another chiller room system provided by an embodiment of the present invention;

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

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

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

[0033] Fig.11 A partial flow chart of another control method provided by an embodiment of the present invention;

[0034] Fig.12 A partial flow chart of another control method provided by an embodiment of the present invention;

[0035] Fig.13 A partial flow chart of another control method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). 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 understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, when describing the pipeline, the "connected" and "connection" used in the present invention have the meaning of conduction. The specific meaning needs to be understood in conjunction with the context.

[0040] In the embodiments of the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present invention should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0041] As described in the background art, under the background of global warming, "low-carbon economy" based on low energy consumption and low pollution has become a global hot spot. Energy conservation and emission reduction are imperative, and low-carbon development has become an inevitable trend of social development.

[0042] Shopping malls, office buildings, libraries and other large public buildings usually shut down their smart air-conditioning systems when they are closed. At this time, the remaining cold in the chilled water pipes after the shutdown is no longer useful and is 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 in air-conditioning automation system control technology.

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

[0045] The chiller room system 100 includes: a fan coil unit 10 and a chilled water system 20. The fan coil unit 10 is used to cool the area where it is located; 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 refrigeration 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 room system 20 to be turned on or off.

[0047] Reference Figure 2 and Figure 3The control system 200 is also configured as follows: S1, obtaining the set closing time t of the area where the intelligent air-conditioning system 1000 is located; S11, the control system 200 turns off the refrigeration function of the cold water system 20 at an advance closing time of a first set time t1 in advance of the set closing time t.

[0048] S12. The control system 200 obtains the outlet water temperature Tc of the cold 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 lower than the first set temperature T1, and whether the indoor temperature Tn is lower than the second set temperature T2; S14, if so, the early closing time is advanced by the second set time t2 to obtain a new early closing time, and the new early closing time is used as the time for shutting down the refrigeration function of the cold water system 20 next time.

[0050] S19, the control system 200 controls the cold water system 20 to close at the set closing time t.

[0051] For example, the set closing time of a certain area is set to 22:00, and the required temperature T of the area is 28°C; the first set time t1 is 15 minutes, the second set time t2 is 5 minutes, the first set temperature T1 is 15°C, and the second set temperature T2 is 28°C.

[0052] The control system 200 turns off the cooling function of the cold water system 20 at an advance closing time of the first set time t1 before the set closing time t. That is, the control system 200 turns off the cooling function of the cold water system 20 at 21:45 on the first day, and continues to cool the area through residual cooling.

[0053] The control system 200 obtains the outlet water temperature Tc of the cold 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 cold water system is 12°C, the indoor temperature Tn of the area where the intelligent air conditioning system is located is 25°C. At this time, Tc<T1 and Tn<T2, that is, after turning off the cooling function of the cold water system 20 at 21:45, the outlet water temperature Tc of the cold 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, then the closing time can continue to be advanced. The cooling function of the cold water system 20 is turned off at 21:40 the next day.

[0054] The intelligent air-conditioning system provided in some embodiments of the present application can effectively reduce building energy consumption and improve energy efficiency by shutting down the chiller in advance, making full use of the residual cooling of the chilled water, and using the control system to determine the best time for early shutdown.

[0055] like Figure 3As shown, the control system 200 is also configured as follows: S15, during the period of shutting down the cooling function of the cold water system 20 at the previously acquired advance shut-off time, obtain the outlet water temperature Tc of the cold water system 20 and the indoor temperature Tn of the area where the intelligent air conditioning system is located.

[0056] S16. Determine 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; S17. If so, advance the advance closing time obtained last time by the second set time t2 to obtain a new advance closing time, and use the new advance closing time as the time for shutting down the refrigeration function of the cold water system next time; S18. If not, use the advance closing times obtained in the first two times as the time for shutting down the refrigeration function of the cold water system next time.

[0057] For example, the set closing time of a certain area is set to 22:00, and the required temperature T of the area is 28°C; the first set time t1 is 15 minutes, the second set time t2 is 5 minutes, the first set temperature T1 is 15°C, and the second set temperature T2 is 28°C.

[0058] The control system 200 turns off the cooling function of the cold water system 20 at an advance closing time of the first set time t1 before the set closing time t. That is, the control system 200 turns off the cooling function of the cold water system 20 at 21:45 on the first day, and continues to cool the area through residual cooling.

[0059] The control system 200 obtains the outlet water temperature Tc of the cold water system and the indoor temperature Tn of the area where the intelligent air conditioning system is located. The first case: if the outlet water temperature Tc of the cold water system is 12°C, the indoor temperature Tn of the area where the intelligent air conditioning system is located is 25°C. At this time, Tc<T1 and Tn<T2, that is, after the refrigeration function of the cold water system 20 is turned off at 21:45, the outlet water temperature Tc of the cold 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, then the closing time can continue to be advanced.

[0060] The next day, the cooling function of the cold water system 20 is turned off at 21:40. The control system 200 will again obtain the outlet water temperature Tc of the cold water system and the indoor temperature Tn of the area where the intelligent air conditioning system is located.

[0061] If the outlet water temperature Tc of the cold water system is 14°C, and the indoor temperature Tn of the area where the intelligent air conditioning system is located is 27°C. At this time, Tc<T1 and Tn<T2, that is, after the cooling function of the cold water system 20 is turned off at 21:40, the outlet water temperature Tc of the cold 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, then the closing time can continue to be advanced. That is, under the condition that Tc<T1 and Tn<T2 are met, the advance closing time is incremented by 5 minutes with the second set time t2, and a new advance closing time is obtained, and the new advance closing time is used as the time for the next shutdown of the cooling function of the cold water system 20.

[0062] If the outlet water temperature Tc of the cold water system is 16°C, and the indoor temperature Tn of the area where the intelligent air conditioning system is located is 29°C, Tc<T1 and Tn<T2 are not satisfied at this time, that is, after the cooling function of the cold water system 20 is turned off at 21:40, the outlet water temperature Tc of the cold 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 further, and the cooling function of the cold water system 20 is turned off at 21:45 on the third day, that is, the advance shutdown time obtained in the first two times is used as the time for shutting down the cooling function of the cold water system next time.

[0063] In some embodiments, the control system 200 obtains the outlet water temperature Tc of the cold water system and the indoor temperature Tn of the area where the intelligent air conditioning system is located. The second case: if the outlet water temperature Tc of the cold water system is 16°C, the indoor temperature Tn of the area where the intelligent air conditioning system is located is 29°C. At this time, Tc<T1 and Tn<T2 are not satisfied, that is, after the refrigeration function of the cold water system 20 is turned off at 21:45, the outlet water temperature Tc of the cold 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 closing time cannot be advanced the next day.

[0064] The cooling function of the cold water system 20 is turned off at 21:50 on the second day, and the control system 200 obtains the outlet water temperature Tc of the cold 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 cold water system is 15.5°C, the indoor temperature Tn of the area where the intelligent air-conditioning system is located is 28.5°C. At this time, Tc<T1 and Tn<T2 are not satisfied, that is, after the cooling function of the cold water system 20 is turned off at 21:50, the outlet water temperature Tc of the cold 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 closing time cannot be advanced on the third day. On the third day, the cooling function of the cold water system 20 is turned off at 21:55, and the control system 200 obtains the outlet water temperature Tc of the cold water system and the indoor temperature Tn of the area where the intelligent air-conditioning system is located until Tc<T1 and Tn<T2 are satisfied.

[0065] In some embodiments, due to seasonal changes and changes in the terminal load of the smart air-conditioning system, such as an increase in the occupancy rate of an office building, the terminal load 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 then re-executed.

[0066] Another example is the transition 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 transition season. There is still room for optimization based on the currently recorded early shutdown time. For example, if the recorded T1 is <14°C and T2 is <27°C, the above steps can be performed again to make full use of the residual cooling of the chiller, improve energy efficiency, and reduce energy consumption.

[0067] Among them, the fan coil unit is installed in each air-conditioned room as the terminal device of the cold water system 20, and can independently process the air. The cold and hot water required for air treatment is centrally prepared by the cold water system 20 and provided to each fan coil. Working principle of fan coil unit: When chilled water or hot water flows through the coil tube, it exchanges heat with the air outside the tube, so that the air is cooled, dehumidified or heated to adjust the indoor air parameters. It is a commonly used cooling and heating terminal device.

[0068] The intelligent air-conditioning system provided in some embodiments of the present application can effectively reduce building energy consumption and improve energy efficiency by shutting down the refrigeration function of the cold water system in advance, making full use of the residual cooling of the chilled water, and using the control system to determine the best time for early shutdown.

[0069] like Figure 4As shown, the control system 200 is also configured as: S11, before setting the closing time t to be ahead of the first set time t1, before turning off the refrigeration function of the cold water system; S21, detecting whether the demand temperature T of the area where the intelligent air-conditioning system is located is greater than the threshold temperature Tx.

[0070] If yes, the step of shutting down the cooling function of the chilled water system at the advance shut-down time is executed.

[0071] If not, S22, increase the outlet water temperature of the cold water system.

[0072] 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.

[0073] If so, S24, the refrigeration function of the cold water system is turned off at an advance closing time of a third set time ahead of the set closing time, and the outlet water temperature of the cold water system is increased next time.

[0074] If not, S25, lower 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.

[0075] In some embodiments, the threshold temperature Tx is 26°C.

[0076] For example, the set closing time of a certain area is set to 22:00, and the required temperature T of the area is 28°C; the first set time t1 is 15min, the second set time t2 is 5min, the first set temperature T1 is 15°C, the second set temperature T2 is 28°C, the fourth set temperature T4 is 11°C, the fifth set temperature T5 is 26°C, and the threshold temperature Tx is 26°C.

[0077] At this time, the required temperature T of the area is greater than the threshold temperature Tx, and the above steps are continued.

[0078] The control system 200 turns off the cooling function of the cold water system 20 at an advance closing time of the first set time t1 before the set closing time t. That is, the control system 200 turns off the cooling function of the cold water system 20 at 21:45 on the first day, and continues to cool the area through residual cooling.

[0079] The control system 200 obtains the outlet water temperature Tc of the cold water system and the indoor temperature Tn of the area where the intelligent air conditioning system is located. The first case: if the outlet water temperature Tc of the cold water system is 12°C, the indoor temperature Tn of the area where the intelligent air conditioning system is located is 25°C. At this time, Tc<T1 and Tn<T2, that is, after the refrigeration function of the cold water system 20 is turned off at 21:45, the outlet water temperature Tc of the cold 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, then the closing time can continue to be advanced.

[0080] The next day, the cooling function of the cold water system 20 is turned off at 21:40. The control system 200 will again obtain the outlet water temperature Tc of the cold water system and the indoor temperature Tn of the area where the intelligent air conditioning system is located.

[0081] If the outlet water temperature Tc of the cold water system is 14°C, and the indoor temperature Tn of the area where the intelligent air conditioning system is located is 27°C. At this time, Tc<T1 and Tn<T2, that is, after the cooling function of the cold water system 20 is turned off at 21:40, the outlet water temperature Tc of the cold 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, then the closing time can continue to be advanced. That is, under the condition that Tc<T1 and Tn<T2 are met, the advance closing time is incremented by 5 minutes with the second set time t2, and a new advance closing time is obtained, and the new advance closing time is used as the time for the next shutdown of the cooling function of the cold water system 20.

[0082] If the outlet water temperature Tc of the cold water system is 16°C, and the indoor temperature Tn of the area where the intelligent air conditioning system is located is 29°C, Tc<T1 and Tn<T2 are not satisfied at this time, that is, after the cooling function of the cold water system 20 is turned off at 21:40, the outlet water temperature Tc of the cold 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 further, and the cooling function of the cold water system 20 is turned off at 21:45 on the third day, that is, the advance shutdown time obtained in the first two times is used as the time for shutting down the cooling function of the cold water system next time.

[0083] For example, the set closing time of a certain area is set to 22:00, and the required temperature T of the area is 26°C; 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°C, the fifth set temperature T5 is 26°C, and the threshold temperature Tx is 26°C.

[0084] At this time, the required temperature T of the area is the same as the threshold temperature Tx, and the outlet water temperature Tc of the chilled water system needs to be increased.

[0085] The control system 200 determines that the outlet water temperature Tc of the cold water system is lower than the fourth set temperature T4, and the indoor temperature Tn is lower than the fifth set temperature T5. Then, the cooling function of the cold water system is turned off at the set closing time t, which is advanced by the third set time t3, and the outlet water temperature Tc of the cold water system is increased next time. The outlet water temperature is increased by 1°C each time.

[0086] That is, the control system 200 turns off the cooling function of the cold water system 20 at 21:55 on the first day, and continues to cool the area by residual cooling. The fourth set temperature T4 is increased to 12°C.

[0087] If the outlet water temperature Tc of the cold water system is not less than the fourth set temperature T4, and the indoor temperature Tn is less than the fifth set temperature T5, the outlet water temperature of the cold water system is reduced until the outlet water temperature of the cold water system is less than the fourth set temperature T4, and the indoor temperature is less than the fifth set temperature T5. The outlet water temperature is reduced by 1°C each time, that is, the fourth set temperature T4 is reduced to 10°C.

[0088] like Figure 5 and Figure 6 As shown, the cold water system 20 also includes: a cooling tower group 1, a cooling pump group 2, a chiller group 3 and a refrigeration pump group 4.

[0089] The input end of the cooling pump group 2 is connected to the output end of the cooling tower group 1; the first input end of the chiller 3 is connected to the output end of the cooling pump group 2, the first output end of the chiller 3 is connected to the input end of the cooling tower group, and the second output end of the chiller 3 is connected to the input end of the fan coil unit 10; the input end of the refrigeration pump group 4 is connected to the output end of the fan coil unit 10, and the output end of the refrigeration pump group 4 is connected to the second input end of the chiller 3.

[0090] Exemplarily, the cooling tower group 1 refers to a plurality of cooling towers, such as Figure 5 The first cooling tower 11 and the second cooling tower 12 in the figure; similarly, the cooling pump group 2 refers to a plurality of cooling pumps, such as Figure 5 The first cooling pump 21, the second cooling pump 22 and the third cooling pump 23; the chiller 3 refers to a plurality of chillers, for example Figure 5 The first chiller 31, the second chiller 32 and the third chiller 33; the refrigeration pump group 4 refers to a plurality of refrigeration pumps, such as Figure 5 The first freezing pump 41, the second freezing pump 42 and the third freezing pump 43 in.

[0091] Reference Figure 5 The input end of the first cooling tower 11 and the input end of the second cooling tower 12 are connected together; the output end of the first cooling tower 11 and the output end of the second cooling tower 12 are connected together.

[0092] The input end of the first cooling pump 21, the input end of the second cooling pump 22 and the input end of the third cooling pump 23 are connected together; the output end of the first cooling pump 21, the output end of the second cooling pump 22 and the output end of the third cooling pump 23 are connected together.

[0093] The first input end of the first chiller 31, the first input end of the second chiller 32 and the first input end of the third chiller 33 are connected together; the second input end of the first chiller 31, the second input end of the second chiller 32 and the second input end of the third chiller 33 are connected together; the first output end of the first chiller 31, the first output end of the second chiller 32 and the first output end of the third chiller 33 are connected together; the second output end of the first chiller 31, the second output end of the second chiller 32 and the second output end of the third chiller 33 are connected together.

[0094] In summary, referring to Figure 5 , the chiller 3 transmits the generated 37℃ cooling water to the cooling tower group 1 for cooling. The 37℃ cooling water is cooled by the cooling tower group 1 and becomes 32℃ cooling water. Then the 32℃ cooling water is transmitted to the chiller 3 through the cooling pump group 2, and the cycle is completed.

[0095] The chiller 3 transmits the generated 7°C chilled water to the fan coil unit for air heat exchange to reduce the indoor temperature. The 7°C chilled water after heating becomes 12°C chilled water, and then the 12°C chilled water is transmitted to the chiller 3 via the refrigeration pump unit 4, and the cycle is completed.

[0096] The control system 200 is in communication connection with the cooling tower group 1 , the cooling pump group 2 , the chiller group 3 and the refrigeration pump group 4 .

[0097] The control system 200 is configured as follows: S11, shutting down the refrigeration function of the chilled water system, specifically as follows: S111, shutting down the chiller, and keeping the cooling tower group, cooling pump group and refrigeration pump group running continuously.

[0098] The chiller 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, cools the water to produce low-temperature chilled water (7°C), and then the heat is brought to the condenser through the action of the compressor. The refrigerant and the low-temperature cooling water exchange heat, so that the cooling water absorbs the heat and then takes the heat out through the water pipe to the external cooling tower for heat dissipation.

[0099] In some embodiments, the chiller is a water-cooled chiller.

[0100] like Figure 6As shown, the chiller 3 includes: an evaporator 60 , a compressor 70 , a condenser 80 and a first filter 90 .

[0101] Among them, the first input end of the evaporator 60 is connected to the output end of the first filter 90, and is also connected to the output end of the compressor 70. The second input end of the evaporator 60 is connected to the output end of the refrigeration 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 first input end of the condenser 80 is 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.

[0102] The specific working process is: at the beginning, the low-temperature and low-pressure refrigerant gas after evaporation and refrigeration is sucked into the compressor 70, and then compressed into high-temperature and high-pressure gas and sent to the condenser 80; the high-pressure and high-temperature gas is cooled by the condenser 80 to condense the gas into a normal temperature and high-pressure liquid; when the normal temperature and high-pressure liquid is throttled to become a low-temperature and low-pressure wet steam, it flows into the evaporator 60, absorbs the heat of the chilled water in the evaporator 60 to lower the water temperature; the evaporated refrigerant is sucked back into the compressor 70, and the next refrigeration cycle is repeated.

[0103] Among them, the refrigeration pump 4 is used to circulate chilled water, and the chilled water enters the fan coil unit 10 to exchange heat with the indoor room, thereby reducing the indoor air temperature and achieving the purpose of refrigeration; the cooling pump 2 is used to circulate cooling water, and 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, and after cooling, it is sent back to the condenser 80 in the chiller 3 to continue heat exchange.

[0104] like Figure 7 and Figure 8 As shown, the cold water system 20 also includes: a water replenishment pump 5 and a water replenishment valve 6; the input end of the water replenishment pump 5 is connected to the water source 7; the input end of the water replenishment valve 6 is connected to the output end of the water replenishment pump 5, and the output end of the water replenishment valve 6 is connected to the input end of the refrigeration pump group 4.

[0105] The control system 200 is connected in communication with the water replenishment pump 5 and is connected in communication with the water replenishment valve 6 .

[0106] According to the above, the chilled water system 20 and the fan coil unit 10 can form a cycle, that is, under ideal conditions, the total amount of water in the chilled water system 20 and the fan coil unit 10 is constant.

[0107] like Fig. 9 and Fig.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 replenishment valve 6.

[0108] The second filter 91 is configured to filter out impurities in the water source 7 to prevent the impurities from damaging the chiller room system 100 .

[0109] like Fig.11 As shown, the control system 200 is configured as follows: S111, shut down the chiller, and keep the cooling tower group, the cooling pump group and the freezing pump group running continuously, specifically configured as follows:

[0110] 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 refrigeration pump group to adjust the frequency according to the pressure difference between the refrigeration supply and return water.

[0111] like Fig.12 As shown, the control system 200 is configured as follows: S111, shut down the chiller, keep the cooling tower group, the cooling pump group and the freezing pump group running continuously, and is specifically configured as follows:

[0112] S1112. Determine whether the outlet water temperature of the cooling tower group is within the third temperature range of the wet-bulb temperature.

[0113] S1113. If yes, then control the number of cooling tower groups to remain unchanged;

[0114] S1114: If not, adjust the operating number of the plurality of cooling towers until the outlet water temperature of the cooling towers is within the third temperature range of the wet-bulb temperature.

[0115] Among them, the wet bulb temperature (adiabatic saturation temperature) refers to the temperature of the system when a large amount of water is in contact with limited humid air under adiabatic conditions, and the latent heat required for water evaporation comes entirely from the sensible heat released by the decrease in the temperature of the humid air. In layman's terms, the wet bulb temperature is the lowest temperature that can be reached in the current environment only by evaporating water. Thermodynamic wet bulb temperature is also called adiabatic saturation temperature.

[0116] like Fig.13 As shown, the control system is configured as follows: S19, controlling the cold water system to shut down at the set shut-down time, specifically configured as follows:

[0117] S191. Shut down the chiller, cooling tower, cooling pump and refrigeration pump.

[0118] like Figure 2 , Figure 3 and Figure 4 As shown, a control method is provided in some embodiments of the present application, and the specific process is as follows:

[0119] Reference Figure 2 and Figure 3 :

[0120] S1. The control system obtains the set shutdown time t of the area where the intelligent air-conditioning system is located.

[0121] S11 , the control system turns off the refrigeration function of the cold water system by a first set time t1 in advance of the set closing time t.

[0122] S12. The control system obtains the outlet water temperature Tc of the cold water system and the indoor temperature Tn of the area where the intelligent air-conditioning system is located.

[0123] S13. The control system determines whether the outlet water temperature Tc of the cold water system is lower than the first set temperature T1, and whether the indoor temperature Tn is lower than the second set temperature T2.

[0124] If yes, go to step S14.

[0125] S14, the control system advances the closing time by a second set time t2 to obtain a new closing time in advance, and uses the new closing time in advance as the time for shutting down the refrigeration function of the chilled water system next time.

[0126] S15. The control system turns off the cooling function of the cold water system during the period of time at the previously acquired advance closing time, and obtains the outlet water temperature Tc of the cold water system and the indoor temperature Tn of the area where the intelligent air conditioning system is located.

[0127] S16. The control system determines whether the outlet water temperature Tc of the cold water system 20 is lower than the first set temperature T1, and whether the indoor temperature Tn is lower than the second set temperature T2.

[0128] If yes, go to step S17; if no, go to step S18.

[0129] S17: The control system advances the previously acquired advance closing time by a second set time t2 to obtain a new advance closing time, and uses the new advance closing time as the time for shutting down the refrigeration function of the chilled water system next time.

[0130] S18: The control system uses the advance shutdown time obtained in the previous two times as the time for shutting down the refrigeration function of the cold water system next time.

[0131] S19. The control system controls the cold water system to shut down at the set shut-down time.

[0132] Reference Figure 4 :

[0133] S1. The control system obtains the set shutdown time t of the area where the intelligent air-conditioning system is located.

[0134] S21. The control system detects whether the required temperature T of the area where the intelligent air-conditioning system is located is greater than the threshold temperature Tx.

[0135] If yes, go to step S11; if no, go to step S22.

[0136] S11 , the control system turns off the refrigeration function of the cold water system by a first set time t1 in advance of the set closing time t.

[0137] S12. The control system obtains the outlet water temperature Tc of the cold water system and the indoor temperature Tn of the area where the intelligent air-conditioning system is located.

[0138] S13. The control system determines whether the outlet water temperature Tc of the cold water system is lower than the first set temperature T1, and whether the indoor temperature Tn is lower than the second set temperature T2.

[0139] If yes, go to step S14.

[0140] S14, the control system advances the closing time by a second set time t2 to obtain a new closing time in advance, and uses the new closing time in advance as the time for shutting down the refrigeration function of the chilled water system next time.

[0141] S15. The control system turns off the cooling function of the cold water system during the period of time at the previously acquired advance closing time, and obtains the outlet water temperature Tc of the cold water system and the indoor temperature Tn of the area where the intelligent air conditioning system is located.

[0142] S16. The control system determines whether the outlet water temperature Tc of the cold water system 20 is lower than the first set temperature T1, and whether the indoor temperature Tn is lower than the second set temperature T2.

[0143] If yes, go to step S17; if no, go to step S18.

[0144] S17: The control system advances the previously acquired advance closing time by a second set time t2 to obtain a new advance closing time, and uses the new advance closing time as the time for shutting down the refrigeration function of the chilled water system next time.

[0145] S18: The control system uses the advance shutdown time obtained in the previous two times as the time for shutting down the refrigeration function of the cold water system next time.

[0146] S19. The control system controls the cold water system to shut down at the set shut-down time.

[0147] S22. The control system increases the outlet water temperature of the cold water system.

[0148] S23. 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.

[0149] S24, the control system turns off the refrigeration function of the cold water system in advance of the set closing time by a third set time, and increases the outlet water temperature of the cold water system next time.

[0150] S25. The control system lowers 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.

[0151] Some embodiments of the present application provide a control method for an intelligent air-conditioning system, which can effectively reduce building energy consumption and improve energy efficiency by shutting down the chiller in advance, making full use of the residual cooling of the chilled water, and using a method to determine the best time to shut down.

[0152] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An intelligent air conditioning system, characterized in that: include: Chiller room system, including: Fan coil units are used to cool the area; A cold water system is connected to the fan coil unit, water circulates between the cold water system and the fan coil unit, and the cold water system has a refrigeration function; A control system, electrically connected to the cold water system, the control system being configured to control the cold water system to be turned on or off; The control system is also configured to: Obtaining the set shutdown time of the area where the intelligent air conditioning system is located; At an advance closing time that is a first set time ahead of the set closing time, shutting down the refrigeration function of the cold water system; Obtaining 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 a first set temperature, and whether the indoor temperature is lower than a second set temperature; If so, the advance closing time is advanced by a second set time to obtain a new advance closing time, and the new advance closing time is used as the time for shutting down the refrigeration function of the chilled water system next time; The cold water system is controlled to be closed at the set closing time.

2. The intelligent air conditioning system according to claim 1, characterized in that: The control system is further configured to: at the previously acquired advance closing time, close the cooling function of the cold water system for a period of time, and 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 a first set temperature, and whether the indoor temperature is lower than a second set temperature; If yes, advance the previously acquired advance closing time by the second set time to obtain a new advance closing time, and use the new advance closing time as the time for shutting down the refrigeration function of the chilled water system next time; If not, the advance closing time obtained the last two times is used as the time for closing the refrigeration function of the cold water system next time.

3. The intelligent air conditioning system according to claim 1, characterized in that: The control system is further configured to: before the set closing time is advanced by a first set time, before shutting down the refrigeration function of the chilled water system; Detecting whether the required temperature of the area where the intelligent air conditioning system is located is greater than a threshold temperature; If yes, executing the step of shutting down the refrigeration function of the chilled water system at the advance shut-down time; If not, increasing the outlet water temperature of the cold water system; Determining whether the outlet water temperature of the cold water system is lower than a fourth set temperature, and whether the indoor temperature is lower than a fifth set temperature; If so, the cooling function of the cold water system is turned off at an advance closing time of a third set time ahead of the set closing time, and the outlet water temperature of the cold water system is increased next time; If not, the outlet water temperature of the cold water system is reduced 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 cold water system comprises: Cooling tower group; A cooling pump group, wherein the input end of the cooling pump group is connected to the output end of the cooling tower group; A chiller, wherein a first input end of the chiller is connected to an output end of the cooling pump unit, a first output end of the chiller is connected to an input end of the cooling tower unit, and a second output end of the chiller is connected to an input end of the fan coil unit; A refrigeration pump group, wherein the input end of the refrigeration pump group is connected to the output end of the fan coil unit, and the output end of the refrigeration pump group is connected to the second input end of the chiller; The control system is in communication connection with the cooling tower group, the cooling pump group, the chiller group and the freezing pump group; The control system is configured to shut down the refrigeration function of the cold water system, and is specifically configured to shut down the chiller and keep the cooling tower group, cooling pump group and refrigeration 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 and keep the cooling tower group, cooling pump group and refrigeration pump group running continuously, and is specifically configured as follows: The cooling pump group is controlled to adjust the frequency according to the temperature difference between the cooling supply and return water, and the freezing pump group is controlled to adjust the frequency according to the pressure difference between the freezing 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 and keep the cooling tower group, cooling pump group and refrigeration pump group running continuously, and is specifically 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 operating quantity of the cooling tower group to remain unchanged; if not, adjust the operating quantity of the cooling tower group 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 cold water system to be closed at the set closing time, and is specifically configured to: Shut down the chiller, cooling tower, cooling pump and refrigeration pump.

8. A control method for an intelligent air conditioning system, characterized in that: Applied to the intelligent air conditioning system according to any one of claims 1 to 7, the control method comprises: The control system obtains a set shutdown time of the area where the intelligent air conditioning system is located; The control system turns off the refrigeration function of the cold water system by an advance turning-off time of a first set time ahead of the set turning-off time; The control system obtains 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 a first set temperature, and whether the indoor temperature is lower than a second set temperature; If so, the advance closing time is advanced by a second set time to obtain a new advance closing time, and the new advance closing time is used as the time for shutting down the refrigeration function of the chilled water system next time; The control system controls the cold water system to be closed at the set closing time.

9. The control method of the intelligent air conditioning system according to claim 8, characterized in that: The control method further comprises: The control system turns off the cooling function of the chilled water system at the previously acquired advance shut-off time, and 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; The control system determines whether the outlet water temperature of the cold water system is lower than a first set temperature, and whether the indoor temperature is lower than a second set temperature; If yes, advance the previously acquired advance closing time by the second set time to obtain a new advance closing time, and use the new advance closing time as the time for shutting down the refrigeration function of the chilled water system next time; If not, the advance closing time obtained the last two times is used as the time for closing the refrigeration function of the cold water system next time.

10. The control method of the intelligent air conditioning system according to claim 9, characterized in that: The control method further comprises: The control system advances the set closing time by a first set time before shutting down the refrigeration function of the chilled water system; the control system detects whether the demand temperature of the area where the intelligent air conditioning system is located is greater than a threshold temperature; If yes, executing the step of shutting down the refrigeration function of the chilled water system at the advance shut-down time; If not, increasing 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 a fourth set temperature, and whether the indoor temperature is lower than a fifth set temperature; If so, the cooling function of the cold water system is turned off at an advance closing time of a third set time ahead of the set closing time, and the outlet water temperature of the cold water system is increased next time; If not, the outlet water temperature of the cold water system is reduced 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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