Control method and control device of water chilling unit and water chilling unit

Abstract

The invention relates to the technical field of air conditioners, in particular to a control method and device of a water chilling unit and the water chilling unit. The control method of the water chilling unit comprises the steps that the actual water temperature of a water storage tank and the actual water outlet temperature of a cooling tower are obtained; according to the relation between the actual water temperature of the water storage tank and the water temperature threshold value of the water storage tank and the relation between the actual water outlet temperature of the cooling tower and the water outlet temperature threshold value of the cooling tower, the water chilling unit is controlled to be switched between the first operation mode and the second operation mode; the first operation mode is that the cooling tower provides cooling water for the heat exchanger, and the second operation mode is that the cooling tower refrigerates the refrigerator and the refrigerator provides chilled water for the heat exchanger. By changing the circulating water channel of the water chilling unit, switching of the operation modes is achieved, so that unnecessary unit equipment is shut down in time, and electricity waste is effectively reduced. And energy-saving control in different scenes is met through double-temperature judgment of the water temperature of the water storage tank and the water outlet temperature of the cooling tower and change of the temperature threshold at any time.

Description

TECHNICAL FIELD

[0001] The present application relates to the air conditioning technical field, and particularly relates to a control method and control device of a water chiller and the water chiller. BACKGROUND

[0002] Some factory equipment runs 24 hours a year, and a large amount of heat is generated when the equipment is running, so an external system is needed to assist heat dissipation, that is, a water chiller is needed to help dissipate heat. At present, when a commercial water chiller is running, all the equipment must be turned on, but in some special periods such as winter, the demand for cold energy is not high, and at this time, turning on all the equipment of the unit for running will cause waste of electricity. SUMMARY

[0003] The present application provides a control method and control device of a water chiller and the water chiller, to solve one of the defects in the prior art, by changing the circulating water passage of the water chiller, the switching of the running mode is realized, so as to timely close unnecessary unit equipment, and effectively reduce the waste of electricity. The double temperature judgment of the water temperature of the water storage tank and the outlet water temperature of the cooling tower, and the temperature threshold value can be changed at any time, so as to meet the energy-saving control of different scenes.

[0004] The present application provides a control method of a water chiller, comprising:

[0005] obtaining the actual water temperature of the water storage tank and the actual outlet water temperature of the cooling tower;

[0006] controlling the water chiller to switch between a first running mode and a second running mode according to the relationship between the actual water temperature of the water storage tank and the water temperature threshold value of the water storage tank, and the relationship between the actual outlet water temperature of the cooling tower and the outlet water temperature threshold value of the cooling tower;

[0007] The first running mode is that the cooling tower provides cooling water for the heat exchanger, and the second running mode is that the cooling tower provides refrigeration for the cold machine, and the cold machine provides refrigerated water for the heat exchanger.

[0008] According to the control method of the water chiller provided by the present application, the water chiller is controlled to switch between the first running mode and the second running mode according to the relationship between the actual water temperature of the water storage tank and the water temperature threshold value of the water storage tank, and the relationship between the actual outlet water temperature of the cooling tower and the outlet water temperature threshold value of the cooling tower, comprising:

[0009] determining that the actual water temperature of the water storage tank is less than the lower limit water temperature of the water storage tank, and controlling the water chiller to switch to the first running mode.

[0010] When the water temperature of the circulating water in the water storage tank is low, the cooling tower is directly used to dissipate heat of the circulating water in the heat exchanger, which effectively avoids waste of electricity, meets the demand of the factory end, and realizes the purpose of low-carbon energy saving.

[0011] The control method of the water chilling unit according to the application controls the water chilling unit to switch between the first operation mode and the second operation mode according to the relationship between the actual water temperature of the water storage tank and the water temperature threshold of the water storage tank and the relationship between the actual outlet water temperature of the cooling tower and the outlet water temperature threshold of the cooling tower, and further comprises:

[0012] When the first relationship condition and the second relationship condition are met, the water chilling unit is controlled to switch to the second operation mode;

[0013] The first relationship condition is that the actual water temperature of the water storage tank is determined to be less than or equal to the upper limit water temperature of the water storage tank and greater than or equal to the lower limit water temperature of the water storage tank.

[0014] The second relationship condition is that the actual outlet water temperature of the cooling tower is determined to be greater than the outlet upper limit temperature of the cooling tower.

[0015] When the water temperature of the circulating water in the water storage tank is not too high but the water temperature of the cooling water of the cooling tower is high, the circulating water in the heat exchanger is directly cooled by the chiller, and the chiller is cooled by the cooling tower, thereby effectively ensuring the heat dissipation requirement of the factory and avoiding energy waste by using the cooling water of the cooling tower.

[0016] The control method of the water chilling unit according to the application further comprises that the second relationship condition further comprises:

[0017] The first duration that the actual outlet water temperature of the cooling tower is greater than the outlet upper limit temperature of the cooling tower is counted,

[0018] The first duration is determined to be greater than a first set time.

[0019] To avoid too frequent switching of the mode of the water chilling unit and to increase the load of the water chilling unit and cause damage to the equipment pipeline of the water chilling unit, the requirement of the operation time is met after the temperature reaches the conversion condition, so that the water chilling unit is ensured to operate in the current mode for a certain time before switching the mode, thereby reducing the switching frequency.

[0020] The control method of the water chilling unit according to the application controls the water chilling unit to switch between the first operation mode and the second operation mode according to the relationship between the actual water temperature of the water storage tank and the water temperature threshold of the water storage tank and the relationship between the actual outlet water temperature of the cooling tower and the outlet water temperature threshold of the cooling tower, and further comprises:

[0021] When the first relationship condition and the third relationship condition are met, the water chilling unit is controlled to switch to the first operation mode;

[0022] The first relationship condition is that the actual water temperature of the water storage tank is determined to be less than or equal to the upper limit water temperature of the water storage tank and greater than or equal to the lower limit water temperature of the water storage tank.

[0023] The third relationship condition is that the actual outlet water temperature of the cooling tower is less than the lower limit outlet water temperature of the cooling tower.

[0024] When the water temperature of the circulating water in the water storage tank is not too high and the water temperature of the cooling water of the cooling tower is low, the circulating water in the heat exchanger is directly cooled by the cooling tower, effectively avoiding waste of electric power, meeting the needs of the factory end, and achieving the purpose of low carbon and energy saving.

[0025] According to the control method of the water chiller provided by the application, the third relationship condition further comprises:

[0026] The second duration that the actual outlet water temperature of the cooling tower is less than the lower limit outlet water temperature of the cooling tower is counted,

[0027] The second duration is determined to be greater than the second set time.

[0028] To avoid too frequent mode switching of the water chiller, increase the load of the water chiller, and cause damage to the equipment pipeline of the water chiller, after the temperature reaches the conversion condition, the requirement of the running time is met at the same time, the water chiller is ensured to run in the current mode for a certain time before mode switching, and the switching frequency is reduced.

[0029] According to the control method of the water chiller provided by the application, the control method comprises the following steps:

[0030] The first relationship condition and the fourth relationship condition are met, and the actual water temperature of the water storage tank and the actual outlet water temperature of the cooling tower are obtained again;

[0031] The first relationship condition is that the actual water temperature of the water storage tank is less than or equal to the upper limit water temperature of the water storage tank, and the actual water temperature of the water storage tank is greater than or equal to the lower limit water temperature of the water storage tank;

[0032] The fourth relationship condition is that the actual outlet water temperature of the cooling tower is less than or equal to the upper limit outlet water temperature of the cooling tower, and the actual outlet water temperature of the cooling tower is greater than or equal to the lower limit outlet water temperature of the cooling tower.

[0033] The circulating water in the heat exchanger does not need to be cooled, so the water chiller does not need to be switched in this detection control period, and directly enters the next detection control period, so as to realize the detection cycle control of the control method.

[0034] According to the application, a control method of a water chilling unit is provided, which controls the water chilling unit to switch between a first operation mode and a second operation mode according to the relationship between the actual water temperature of a water storage tank and the water temperature threshold of the water storage tank and the relationship between the actual outlet water temperature of a cooling tower and the outlet water temperature threshold of the cooling tower, and further comprises:

[0035] When it is determined that the actual water temperature of the water storage tank is greater than the upper limit water temperature of the water storage tank, the water chilling unit is controlled to switch to the second operation mode.

[0036] When the water temperature of the circulating water in the water storage tank is high, the circulating water in the heat exchanger is directly cooled by the cold machine, and the cooling tower cools the cold machine, thereby effectively avoiding energy waste of the cooling tower, meeting the needs of the factory end, and achieving the purpose of low carbon and energy saving.

[0037] The application further provides a control device, comprising:

[0038] The acquisition module is configured to acquire the actual water temperature of the water storage tank and the actual outlet water temperature of the cooling tower.

[0039] The control module is configured to control the water chilling unit to switch between the first operation mode and the second operation mode according to the relationship between the actual water temperature of the water storage tank and the water temperature threshold of the water storage tank and the relationship between the actual outlet water temperature of the cooling tower and the outlet water temperature threshold of the cooling tower.

[0040] The first operation mode is that the cooling tower provides cooling water for the heat exchanger, and the second operation mode is that the cooling tower provides refrigeration for the cold machine, and the cold machine provides chilled water for the heat exchanger.

[0041] The application further provides a water chilling unit comprising the control device or performing the control method of the water chilling unit.

[0042] The application further provides an air conditioner comprising the water chilling unit.

[0043] The control method of the water chilling unit provided by the application can switch the water chilling unit between two operation modes, in the first operation mode, only the second cooling water circulation system is started to work, and in the second operation mode, the chilled water circulation system and the first cooling water circulation system are started to work together.

[0044] The actual water temperature of the water storage tank and the actual outlet water temperature of the cooling tower are acquired by real-time detection, the relationship between the actual water temperature of the water storage tank and the water temperature threshold of the water storage tank is combined with the relationship between the actual outlet water temperature of the cooling tower and the outlet water temperature threshold of the cooling tower as a relationship condition, whether the relationship condition meets the preset conversion condition is judged, if yes, the mode conversion of the respective conversion conditions of the first operation mode and the second operation mode is carried out, and then the automatic control of the opening and closing of the valve bodies and the start and stop of the cooling machine, the cooling tower, the cooling pump and the refrigeration pump is realized, so that the cooling demand of the water storage tank is met, and the energy-saving purpose in different external environments is achieved.

[0045] When the water chiller unit is switched to the first operation mode, the cooling machine is closed, the cooling tower is directly used to provide cooling water for the heat exchanger, the circulating water in the water storage tank is radiated, the waste of electric quantity is effectively avoided, and the low-carbon energy-saving purpose is realized. When the water chiller unit is switched to the second operation mode, the cooling machine is opened, the cooling machine is directly used to provide refrigeration water for the heat exchanger, the circulating water in the water storage tank is radiated, and the cooling tower is only used to radiate the cooling machine, so that the cooling requirement of the heat exchanger is met.

[0046] The control method of the water chiller unit provided by the application realizes the switching of the operation mode by changing the circulating water passage of the water chiller unit, unnecessary unit equipment is closed in time, the waste of electric quantity is effectively reduced, the program is automatically controlled, manual intervention is not needed, the mode switching is carried out when the conversion condition is met, the plant cooling demand is effectively ensured, and the labor cost is reduced. The double-temperature judgment of the water temperature of the water storage tank and the outlet water temperature of the cooling tower and the fact that the temperature threshold can be changed at any time meet the energy-saving control of different scenes. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0048] Figure 1 is a structural schematic diagram of the water chiller unit provided by the embodiment of the application;

[0049] Figure 2 is one of the flow schematic diagrams of the control method of the water chiller unit provided by the embodiment of the application;

[0050] Figure 3 is the second flow schematic diagram of the control method of the water chiller unit provided by the embodiment of the application;

[0051] Figure 4 is a structural schematic diagram of the electronic device provided by the embodiment of the application.

[0052] Reference signs:

[0053] 100, water storage tank; 200, heat exchanger;

[0054] 300, cooling tower; 310, cooling pump;

[0055] 400, cold machine; 410, refrigeration pump;

[0056] 510, first valve body; 520, second valve body; 530, third valve body; 540, fourth valve body; 550, fifth valve body; 560, sixth valve body;

[0057] 600, factory end;

[0058] 810, processor; 820, communication interface; 830, memory; 840, communication bus. DETAILED DESCRIPTION

[0059] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below in combination with the drawings in the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0060] The prior art air conditioning cold water unit includes a cold machine, a cooling tower, a refrigeration pump, a cooling pump and a valve body. In actual operation, the valve body needs to be in a fully open state, and the cold machine, the cooling tower, the cooling pump and the refrigeration pump all need to be in an operating state. The temperature at the factory end is too high, and auxiliary heat dissipation is needed. Water is taken from the water storage tank for heat exchange. When the temperature of the water storage tank is too high, heat dissipation cannot be completed, and the air conditioning cold water unit needs to be used for refrigeration to reduce the temperature of the water storage tank and achieve the purpose of heat dissipation at the factory end.

[0061] When the temperature of the water storage tank is high, the temperature of the water storage tank needs to be reduced. At this time, the cold water unit is started, and the refrigeration pump, the cold machine, the cooling pump, the cooling tower and the valve body all need to be opened. If the external environment is also very low at this time, the cold machine is started to refrigerate, which will make the water temperature in the water storage tank drop to a relatively low level, which is much lower than the actual cooling capacity required by the factory end. However, after the cold machine is turned off, the cooling capacity cannot meet the requirements of the factory end, and the cold machine can only be kept on, which will cause waste of electric power and resources.

[0062] As Figure 1As shown, the water chilling unit provided by the embodiment of the present application comprises a water storage tank 100, a heat exchanger 200, a cooling tower 300 and a cooling machine 400. The water storage tank 100 is in communication with the heat releasing passage of the heat exchanger 200. The first heat absorbing passage of the heat exchanger 200 is in communication with the heat releasing passage of the cooling machine 400. The second heat absorbing passage of the heat exchanger 200 is in communication with the cooling tower 300. The heat absorbing passage of the cooling machine 400 is in communication with the cooling tower 300.

[0063] The cooling tower 300 and the second heat absorbing passage of the heat exchanger 200 form a first circulation loop through the communication of the cooling pump 310. The first valve body 510 is arranged on the pipeline in communication with the heat exchanger 200 and the cooling tower 300. The second valve body 520 is arranged on the pipeline in communication with the cooling pump 310 and the heat exchanger 200.

[0064] The heat releasing passage of the cooling machine 400 and the first heat absorbing passage of the heat exchanger 200 form a second circulation loop through the communication of the refrigeration pump 410. The third valve body 530 is arranged on the pipeline in communication with the refrigeration pump 410 and the heat exchanger 200. The fourth valve body 540 is arranged on the pipeline in communication with the heat exchanger 200 and the cooling machine 400.

[0065] The cooling tower 300 and the heat absorbing passage of the cooling machine 400 form a third circulation loop through the communication of the cooling pump 310. The fifth valve body 550 is arranged on the pipeline in communication with the cooling machine 400 and the cooling tower 300. The sixth valve body 560 is arranged on the pipeline in communication with the cooling pump 310 and the cooling machine 400.

[0066] The water chilling unit of the embodiment comprises the water storage tank 100, the cooling machine 400, the cooling tower 300, the refrigeration pump 410, the cooling pump 310 and the valve bodies. When the water chilling unit is in operation, three circulation water systems are required to complete the external heat exchange, which are the refrigeration water circulation system, the first cooling water circulation system and the second cooling water circulation system.

[0067] The refrigeration water circulation system is composed of the heat exchanger 200, the cooling machine 400, the refrigeration pump 410 and the refrigeration water pipeline. The refrigeration water flowing out of the cooling machine 400 is pressurized by the refrigeration pump 410 and sent into the refrigeration water pipeline to be delivered to the heat exchanger 200. The refrigeration water exchanges heat in each room through the heat exchanger 200, takes away the heat in the room and lowers the temperature in the room.

[0068] The first cooling water circulation system is composed of the cooling machine 400, the cooling tower 300, the cooling pump 310 and the cooling water pipeline. The cooling machine 400 exchanges heat, which causes the water to be cooled and releases a large amount of heat. The heat is absorbed by the cooling water, which causes the temperature of the cooling water to rise. The cooling pump 310 pressurizes the cooling water after the temperature rises and sends it into the cooling tower 300, so that the cooling water exchanges heat with the atmosphere in the cooling tower 300 and then is sent back to the cooling machine 400 after the temperature is lowered. The process is repeated continuously to take away the heat released by the cooling machine 400.

[0069] The second cooling water circulation system is composed of the heat exchanger 200, the cooling tower 300, the cooling pump 310 and the cooling water pipeline. The cooling water flowing out of the cooling tower 300 is pressed into the cooling water pipeline by the cooling pump 310, and is transported to the heat exchanger 200. The cooling water is used for heat exchange in each room through the heat exchanger 200, and takes away the heat in the room, so that the temperature in the room is reduced.

[0070] The control method of the water chiller provided by the present application is described below. The air conditioner described below can be referred to in correspondence with the water chiller described above.

[0071] As shown in Figure 2 and Figure 3 The control method of the water chiller provided by the present application comprises the following steps.

[0072] The actual water temperature t1 of the water storage tank 100 and the actual outlet water temperature t2 of the cooling tower 300 are obtained.

[0073] According to the relationship between the actual water temperature t1 of the water storage tank 100 and the water temperature threshold value of the water storage tank 100, and the relationship between the actual outlet water temperature t2 of the cooling tower 300 and the outlet water temperature threshold value of the cooling tower 300, the water chiller is controlled to switch between the first operation mode and the second operation mode.

[0074] The first operation mode is that the cooling tower 300 provides cooling water for the heat exchanger 200, and the second operation mode is that the cooling tower 300 provides refrigeration for the chiller 400, and the chiller 400 provides chilled water for the heat exchanger 200.

[0075] The control method of the water chiller provided by the present application can switch the water chiller between the two operation modes. In the first operation mode, only the second cooling water circulation system is started to work, and in the second operation mode, the chilled water circulation system and the first cooling water circulation system are started to work together.

[0076] The actual water temperature t1 of the water storage tank 100 and the actual outlet water temperature t2 of the cooling tower 300 are obtained by real-time detection. The relationship between the actual water temperature t1 of the water storage tank 100 and the water temperature threshold value of the water storage tank 100, and the relationship between the actual outlet water temperature t2 of the cooling tower 300 and the outlet water temperature threshold value of the cooling tower 300 are used as the relationship condition. Whether the relationship condition meets the pre-set conversion condition is judged. If yes, the mode conversion is performed according to the respective conversion conditions of the first operation mode and the second operation mode. Then, the opening and closing of the valve bodies, and the start and stop of the chiller 400, the cooling tower 300, the cooling pump 310 and the chilled pump 410 are automatically controlled, so that the demand for cooling the water storage tank 100 is met, and the energy-saving purpose in different external environments is achieved.

[0077] When the water chiller unit switches to the first operation mode, the chiller 400 is closed, and the cooling tower 300 is directly used to provide cooling water for the heat exchanger 200 to dissipate heat of the circulating water in the water storage tank 100, effectively avoiding waste of electric power and achieving the purpose of low-carbon energy saving. When the water chiller unit switches to the second operation mode, the chiller 400 is opened, and the chiller 400 is directly used to provide chilled water for the heat exchanger 200 to dissipate heat of the circulating water in the water storage tank 100, and the cooling tower 300 is only used to dissipate heat of the chiller 400, thereby meeting the requirement of the heat exchanger 200 for cooling capacity.

[0078] The control method of the water chiller unit of the application can realize switching of operation modes by changing the circulating water passage of the water chiller unit, thereby timely closing unnecessary unit equipment and effectively reducing waste of electric power. Moreover, the program is automatically controlled without manual intervention, the mode is switched when the conversion condition is met, the factory heat dissipation requirement is effectively ensured, and the labor cost is reduced. The double-temperature judgment of the water temperature of the water storage tank 100 and the outlet water temperature of the cooling tower 300 and the temperature threshold value can be changed at any time, thereby meeting the energy-saving control of different scenes.

[0079] According to one embodiment of the application, the water chiller unit is controlled to switch between the first operation mode and the second operation mode according to the relationship between the actual water temperature t1 of the water storage tank 100 and the water temperature threshold value of the water storage tank 100 and the relationship between the actual outlet water temperature t2 of the cooling tower 300 and the outlet water temperature threshold value of the cooling tower 300, and the control method comprises the following steps.

[0080] It is determined that the actual water temperature t1 of the water storage tank 100 is less than the lower limit water temperature t1_L of the water storage tank 100, and the water chiller unit is controlled to switch to the first operation mode.

[0081] In this embodiment, the water temperature threshold value of the water storage tank 100 is the lower limit water temperature t1_L of the cold storage tank, that is, the low limit of the temperature alarm of the water storage tank 100. The size relationship between the actual water temperature t1 of the water storage tank 100 and the water temperature threshold value of the water storage tank 100 is judged, and if the actual water temperature t1 of the water storage tank 100 is less than the lower limit water temperature t1_L of the water storage tank 100, the water chiller unit is controlled to switch to the first operation mode.

[0082] The first operation mode can be a winter mode. When the ambient temperature is low, and the water temperature of the circulating water in the water storage tank 100 is too low, it is proved that the heat exchanger 200 has a low demand for cooling capacity, the first valve body 510 and the second valve body 520 are opened, the chiller 400 is closed, and the cooling water of the cooling tower 300 is directly used to dissipate heat of the circulating water in the heat exchanger 200, thereby effectively avoiding waste of electric power, meeting the requirement of the factory terminal 600, and achieving the purpose of low-carbon energy saving.

[0083] According to one embodiment of the present application, the water chiller unit is controlled to switch between the first operation mode and the second operation mode according to the relationship between the actual water temperature t1 of the water storage tank 100 and the water temperature threshold of the water storage tank 100, and the relationship between the actual outlet water temperature t2 of the cooling tower 300 and the outlet water temperature threshold of the cooling tower 300, and further comprising:

[0084] satisfying the first relationship condition, i.e., determining that the actual water temperature t1 of the water storage tank 100 is less than or equal to the upper limit water temperature t1_H of the water storage tank 100, and the actual water temperature t1 of the water storage tank 100 is greater than or equal to the lower limit water temperature t1_L of the water storage tank 100;

[0085] simultaneously satisfying the second relationship condition, i.e., determining that the actual outlet water temperature t2 of the cooling tower 300 is greater than the outlet upper limit temperature t2_H of the cooling tower 300;

[0086] then the water chiller unit is controlled to switch to the second operation mode.

[0087] In this embodiment, the water temperature threshold of the water storage tank 100 is the lower limit water temperature t1_L of the water storage tank and the upper limit water temperature t1_H of the water storage tank, i.e., the low limit of the water storage tank 100 temperature alarm and the high limit of the water storage tank 100 temperature alarm, and the water temperature threshold of the cooling tower 300 is the outlet upper limit temperature t2_H of the cooling tower 300, i.e., the high limit of the outlet water temperature alarm of the cooling tower 300. First, the size relationship between the actual water temperature t1 of the water storage tank 100 and the water temperature threshold of the water storage tank 100 is judged. If the actual water temperature t1 of the water storage tank 100 is less than or equal to the upper limit water temperature t1_H of the water storage tank 100, and greater than or equal to the lower limit water temperature t1_L of the water storage tank 100, then the size relationship between the actual outlet water temperature t2 of the cooling tower 300 and the water temperature threshold of the cooling tower 300 is judged. If the actual outlet water temperature t2 of the cooling tower 300 is greater than the outlet upper limit temperature t2_H of the cooling tower 300, then the water chiller unit is controlled to switch to the second operation mode.

[0088] The second operation mode can be a summer mode. When the external environment temperature is relatively high, the water temperature of the circulating water in the water storage tank 100 is not too high or too low, but the water temperature of the cooling water of the cooling tower 300 is too high, it is proved that the demand for cold energy of the heat exchanger 200 is general, but the water temperature of the cooling water of the cooling tower 300 cannot meet the demand for cold energy of the heat exchanger 200. Therefore, the first valve body 510 and the second valve body 520 are closed, the third valve body 530, the fourth valve body 540, the fifth valve body 550 and the sixth valve body 560 are opened, the cold machine 400 is opened, the cooling tower 300 is started, and the circulating water in the heat exchanger 200 is directly cooled by the chilled water of the cold machine 400. At the same time, the cooling water of the cooling tower 300 is used to cool the cold machine 400, effectively ensuring the cooling demand of the factory, and avoiding energy waste by using the cooling water of the cooling tower 300.

[0089] According to one embodiment of the present application, the second relationship condition further comprises:

[0090] Count the first duration T1 during which the actual outlet water temperature t2 of the cooling tower 300 is greater than the upper limit temperature t2_H of the outlet water of the cooling tower 300.

[0091] It is determined that the first duration T1 is greater than the first set time T_1.

[0092] In this embodiment, when judging the relationship between the actual outlet water temperature t2 of the cooling tower 300 and the water temperature threshold of the cooling tower 300, the timing is started when it is determined that the actual outlet water temperature t2 of the cooling tower 300 is greater than the upper limit temperature t2_H of the outlet water of the cooling tower 300. The duration of the actual outlet water temperature t2 of the cooling tower 300 being greater than the upper limit temperature t2_H of the outlet water of the cooling tower 300 is counted as the first duration T1, and then the size of the first duration T1 and the first set time T_1 are judged. If the first duration T1 is greater than the first set time T_1, the chiller is controlled to switch to the second operating mode.

[0093] When it is detected that the actual outlet water temperature t2 of the cooling tower 300 is greater than the upper limit outlet water temperature t2_H of the cooling tower 300, the conversion condition is met. However, in order to avoid the mode switching of the chiller being too frequent, increasing the load of the chiller, and causing damage to the equipment and pipelines of the chiller, after the temperature reaches the conversion condition, the operating time requirements must be met at the same time to ensure that the chiller runs in the current mode for a certain period of time before switching modes, thereby reducing the switching frequency.

[0094] According to an embodiment of the present invention, controlling the chiller to switch between the first operating mode and the second operating mode based on a relationship between the actual water temperature t1 of the water storage tank 100 and a water temperature threshold of the water storage tank 100, and a relationship between the actual outlet water temperature t2 of the cooling tower 300 and the outlet water temperature threshold of the cooling tower 300, further includes:

[0095] The first relationship condition is satisfied, that is, the actual water temperature t1 of the water tank 100 is less than or equal to the upper limit water temperature t1_H of the water tank 100, and the actual water temperature t1 of the water tank 100 is greater than or equal to the lower limit water temperature t1_L of the water tank 100;

[0096] At the same time, the third relationship condition is satisfied, that is, the actual outlet water temperature t2 of the cooling tower 300 is determined to be less than the lower limit outlet water temperature t2_L of the cooling tower 300;

[0097] The chiller is controlled to switch to the first operating mode.

[0098] In the embodiment, the water temperature threshold of the water storage tank 100 is the lower limit water temperature t1_L of the cold storage tank and the upper limit water temperature t1_H of the cold storage tank, that is, the low limit of the temperature alarm of the water storage tank 100 and the high limit of the temperature alarm of the water storage tank 100, and the water temperature threshold of the cooling tower 300 is the lower limit temperature t2_L of the outlet water of the cooling tower 300, that is, the low limit of the outlet water temperature alarm of the cooling tower 300. First, the actual water temperature t1 of the water storage tank 100 and the water temperature threshold of the water storage tank 100 are judged, if the actual water temperature t1 of the water storage tank 100 is less than or equal to the upper limit water temperature t1_H of the water storage tank 100 and greater than or equal to the lower limit water temperature t1_L of the water storage tank 100, then the actual outlet water temperature t2 of the cooling tower 300 and the water temperature threshold of the cooling tower 300 are judged, if the actual outlet water temperature t2 of the cooling tower 300 is less than the lower limit temperature t2_L of the outlet water of the cooling tower 300, then the water chiller group is controlled to switch to the first running mode.

[0099] The first running mode can be a summer mode, when the external environment temperature is high, the water temperature of the circulating water in the water storage tank 100 is not too high or too low, but the water temperature of the cooling water of the cooling tower 300 is too low, it is indicated that the cooling capacity demand of the heat exchanger 200 is general, and the cooling tower 300 can fully meet the cooling capacity demand of the heat exchanger 200, therefore, the third valve body 530, the fourth valve body 540, the fifth valve body 550 and the sixth valve body 560 are closed, the first valve body 510 and the second valve body 520 are opened, the cooling tower 300 is opened, and the cold machine 400 is closed, so that the cooling water of the cooling tower 300 is directly used to radiate the circulating water in the heat exchanger 200, effectively avoiding the waste of electric energy, meeting the demand of the factory terminal 600, and realizing the purpose of low carbon and energy saving.

[0100] According to one embodiment of the present application, the third relationship condition further comprises:

[0101] The second duration T2 that the actual outlet water temperature t2 of the cooling tower 300 is less than the lower limit temperature t2_L of the outlet water of the cooling tower 300 is counted,

[0102] The second duration T2 is determined to be greater than the second set time T_2.

[0103] In the embodiment, when the actual outlet water temperature t2 of the cooling tower 300 and the water temperature threshold of the cooling tower 300 are judged, if the actual outlet water temperature t2 of the cooling tower 300 is less than the lower limit temperature t2_L of the outlet water of the cooling tower 300, then the counting is started, the duration that the actual outlet water temperature t2 of the cooling tower 300 is less than the lower limit temperature t2_L of the outlet water of the cooling tower 300 is counted as the second duration T2, and then the second duration T2 and the second set time T_2 are judged, if the second duration T2 is greater than the second set time T_2, then the water chiller group is controlled to switch to the first running mode.

[0104] When the actual outlet water temperature t2 of the cooling tower 300 is detected to be less than the lower limit outlet water temperature t2_L of the cooling tower 300, that is, the conversion condition is met, to avoid too frequent mode switching of the water chiller and to increase the load of the water chiller, which may damage the equipment pipeline of the water chiller, after the temperature reaches the conversion condition, the requirement of the running time needs to be met to ensure that the water chiller runs in the current mode for a certain time before mode switching, thereby reducing the switching frequency.

[0105] According to one embodiment of the present application, the water chiller is controlled to switch between the first running mode and the second running mode according to the relationship between the actual water temperature t1 of the water storage tank 100 and the water temperature threshold of the water storage tank 100 and the relationship between the actual outlet water temperature t2 of the cooling tower 300 and the outlet water temperature threshold of the cooling tower 300, and further comprising:

[0106] The first relationship condition is met, that is, it is determined that the actual water temperature t1 of the water storage tank 100 is less than or equal to the upper limit water temperature t1_H of the water storage tank 100 and greater than or equal to the lower limit water temperature t1_L of the water storage tank 100;

[0107] The fourth relationship condition is met, that is, it is determined that the actual outlet water temperature t2 of the cooling tower 300 is less than or equal to the upper limit outlet water temperature t2_H of the cooling tower 300 and greater than or equal to the lower limit outlet water temperature t2_L of the cooling tower 300;

[0108] Then the actual water temperature t1 of the water storage tank 100 and the actual outlet water temperature t2 of the cooling tower 300 are returned to be acquired.

[0109] In this embodiment, the water temperature threshold of the water storage tank 100 is the lower limit water temperature t1_L of the water storage tank and the upper limit water temperature t1_H of the water storage tank, that is, the low limit of the water storage tank temperature alarm and the high limit of the water storage tank temperature alarm, and the water temperature threshold of the cooling tower 300 is the lower limit outlet water temperature t2_L of the cooling tower 300 and the upper limit outlet water temperature t2_H of the cooling tower 300, that is, the low limit of the cooling tower outlet water temperature alarm and the high limit of the cooling tower outlet water temperature alarm. First, the size relationship between the actual water temperature t1 of the water storage tank 100 and the water temperature threshold of the water storage tank 100 is judged. If the actual water temperature t1 of the water storage tank 100 is less than or equal to the upper limit water temperature t1_H of the water storage tank 100 and greater than or equal to the lower limit water temperature t1_L of the water storage tank 100, then the size relationship between the actual outlet water temperature t2 of the cooling tower 300 and the water temperature threshold of the cooling tower 300 is judged. If the actual outlet water temperature t2 of the cooling tower 300 is greater than or equal to the lower limit outlet water temperature t2_L of the cooling tower 300 and less than or equal to the upper limit outlet water temperature t2_H of the cooling tower 300, then the actual water temperature t1 of the water storage tank 100 and the actual outlet water temperature t2 of the cooling tower 300 are returned to be acquired.

[0110] The actual temperature of the water storage tank 100 is within the water temperature threshold of the water storage tank 100, and the actual outlet water temperature t2 of the cooling tower 300 is within the outlet water temperature threshold of the cooling tower 300, which indicates that the heat exchanger 200 generally needs cold energy at this time, and the cooling tower 300 also maintains a stable state of cold energy, and the circulating water in the heat exchanger 200 does not need to be cooled, so in this detection control period, the water chiller does not need to switch modes, and directly enters the next detection control period, to realize the detection cycle control of the control method.

[0111] According to one embodiment of the present application, the water chiller is switched between the first operating mode and the second operating mode according to the relationship between the actual water temperature t1 of the water storage tank 100 and the water temperature threshold of the water storage tank 100, and the relationship between the actual outlet water temperature t2 of the cooling tower 300 and the outlet water temperature threshold of the cooling tower 300, and further comprising:

[0112] If the actual water temperature t1 of the water storage tank 100 is greater than the upper limit water temperature t1_H of the water storage tank 100, the water chiller is switched to the second operating mode.

[0113] In this embodiment, the water temperature threshold of the water storage tank 100 is the upper limit water temperature t1_H of the water storage tank, that is, the high limit of the temperature alarm of the water storage tank 100. The relationship between the actual water temperature t1 of the water storage tank 100 and the water temperature threshold of the water storage tank 100 is determined, and if the actual water temperature t1 of the water storage tank 100 is greater than the upper limit water temperature t1_H of the water storage tank 100, the water chiller is switched to the second operating mode.

[0114] The second operating mode can be a summer mode. When the external environment temperature is high, and the water temperature of the circulating water in the water storage tank 100 is also too high, it proves that the heat exchanger 200 needs more cold energy, the third valve body 530, the fourth valve body 540, the fifth valve body 550 and the sixth valve body 560 are opened, the first valve body 510 and the second valve body 520 are closed, the cooling tower 300 is started, and the chiller 400 is started, and the chilled water of the chiller 400 is directly used to cool the circulating water in the heat exchanger 200, while the cooling water of the cooling tower 300 is used to cool the chiller 400, effectively avoiding the energy waste of the cooling tower 300, meeting the needs of the factory end 600, and realizing the purpose of low carbon and energy saving.

[0115] In one embodiment, the control method of the water chiller is as follows:

[0116] The actual water temperature t1 of the water storage tank 100 and the actual outlet water temperature t2 of the cooling tower 300 are obtained.

[0117] If the actual water temperature t1 of the water storage tank 100 is greater than the upper limit water temperature t1_H of the water storage tank 100, the water chiller is directly switched to the second operation mode; if the actual water temperature t1 of the water storage tank 100 is less than the lower limit water temperature t1_L of the water storage tank 100, the water chiller is directly switched to the first operation mode; if the actual water temperature t1 of the water storage tank 100 is within the water temperature threshold range of the water storage tank 100, the relationship between the actual outlet water temperature t2 of the cooling tower 300 and the outlet water temperature threshold of the cooling tower 300 is further judged. If the actual outlet water temperature t2 of the cooling tower 300 is greater than the outlet upper limit temperature t2_H of the cooling tower 300, and the time of being greater than the outlet upper limit temperature t2_H of the cooling tower 300 is greater than the first set time T_1, the heating system is switched to the second operation mode; if the actual outlet water temperature t2 of the cooling tower 300 is less than the outlet lower limit temperature t2_L of the cooling tower 300, and the time of being less than the outlet lower limit temperature t2_L of the cooling tower 300 is greater than the second set time T_2, the heating system is switched to the first operation mode; if the actual outlet water temperature t2 of the cooling tower 300 is within the outlet water temperature threshold range of the cooling tower 300, the actual water temperature t1 of the water storage tank 100 and the actual outlet water temperature t2 of the cooling tower 300 are acquired again, and the judgment cycle is performed.

[0118] The control device provided by the present application is described below, and the control device described below can be referred to in correspondence with the control method of the water chiller described above.

[0119] The present application also provides a control device, comprising:

[0120] The acquisition module is configured to acquire the actual water temperature t1 of the water storage tank 100 and the actual outlet water temperature t2 of the cooling tower 300.

[0121] The control module is configured to control the water chiller to switch between the first operation mode and the second operation mode according to the relationship between the actual water temperature t1 of the water storage tank 100 and the water temperature threshold of the water storage tank 100, and the relationship between the actual outlet water temperature t2 of the cooling tower 300 and the outlet water temperature threshold of the cooling tower 300.

[0122] The first operation mode is that the cooling tower 300 provides cooling water for the heat exchanger 200, and the second operation mode is that the cooling tower 300 provides refrigeration for the cold machine 400, and the cold machine 400 provides chilled water for the heat exchanger 200.

[0123] The control device of the embodiment of the present application obtains the actual water temperature t1 of the water storage tank 100 and the actual outlet water temperature t2 of the cooling tower 300 through the obtaining module, and then compares the water temperature threshold of the water storage tank 100 and the outlet water temperature threshold of the cooling tower 300 pre-stored in the control module, and obtains the conversion condition according to the comparison result, and controls the chiller unit to switch between the first operation mode and the second operation mode.

[0124] In the embodiment, the first set time T_1 and the second set time T_2 are pre-stored in the control module, so as to compare the first duration T1 and the second duration T2.

[0125] The chiller unit provided by the present application is described below, and the cooling system described below can be correspondingly referred to the control device or the control method of the cooling system described above.

[0126] The embodiment of the present application also provides a chiller unit comprising the control device or performing the control method of the chiller unit.

[0127] The chiller unit of the embodiment of the present application is provided with a first temperature sensor on the water storage tank 100 to detect the actual water temperature t1 of the water storage tank 100 in real time, and a second temperature sensor on the cooling tower 300 to monitor the actual outlet water temperature t2 of the cooling tower 300 in real time. The first temperature sensor and the second temperature sensor send the detection results to the obtaining module of the control device, and then generate the corresponding switching instruction through the control module, so as to control the chiller 400, the cooling tower 300, the cooling pump 310, the refrigeration pump 410 and the valve body in the chiller unit.

[0128] Figure 4 An example of a schematic diagram of a physical structure of an electronic device is shown in Figure 4 As shown in the figure, the electronic device can include a processor 810, a communication interface 820, a memory 830 and a communication bus 840, wherein the processor 810, the communication interface 820 and the memory 830 complete mutual communication through the communication bus 840. The processor 810 can call the logical instructions in the memory 830 to execute the control method of the chiller unit.

[0129] In addition, the logic instructions in the memory 830 described above can be implemented in the form of software functional units and sold or used as independent products, and can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the parts that make contributions to the prior art or parts of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes various media that can store program codes, such as a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0130] The device embodiments described above are only illustrative, wherein the units illustrated as separate components can or can not be physically separated, and the components illustrated as units can or can not be physical units, i.e., can be located in one place or distributed on multiple network units. Part or all of the modules can be selected to achieve the purpose of the embodiment according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0131] From the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be realized by means of software and necessary general hardware platform, and of course can also be realized by hardware. Based on such understanding, the above technical solutions essentially or the parts that make contributions to the prior art can be embodied in the form of a software product. The computer software product can be stored in a computer readable storage medium, such as a ROM / RAM, a magnetic disk, an optical disk, etc., and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiment.

[0132] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A control method of a water chiller, characterized by, The method comprises: obtaining an actual water temperature of a water storage tank (100) and an actual outlet water temperature of a cooling tower (300); controlling a chiller unit to switch between a first operation mode and a second operation mode according to a relationship between the actual water temperature of the water storage tank (100) and a water temperature threshold of the water storage tank (100) and a relationship between the actual outlet water temperature of the cooling tower (300) and an outlet water temperature threshold of the cooling tower (300); the first operation mode is that the cooling tower (300) provides cooling water for a heat exchanger (200), and the second operation mode is that the cooling tower (300) provides refrigeration for a chiller (400), and the chiller (400) provides chilled water for the heat exchanger (200).

2. The control method of a water chiller according to claim 1, characterized by, The controlling the chiller unit to switch between the first operation mode and the second operation mode according to the relationship between the actual water temperature of the water storage tank (100) and the water temperature threshold of the water storage tank (100) and the relationship between the actual outlet water temperature of the cooling tower (300) and the outlet water temperature threshold of the cooling tower (300) comprises: determining that the actual water temperature of the water storage tank (100) is less than a lower limit water temperature of the water storage tank (100), and controlling the chiller unit to switch to the first operation mode.

3. The control method of a water chiller according to claim 2, characterized by, The controlling the chiller unit to switch between the first operation mode and the second operation mode according to the relationship between the actual water temperature of the water storage tank (100) and the water temperature threshold of the water storage tank (100) and the relationship between the actual outlet water temperature of the cooling tower (300) and the outlet water temperature threshold of the cooling tower (300) further comprises: satisfying a first relationship condition and a second relationship condition, and controlling the chiller unit to switch to the second operation mode; the first relationship condition is that it is determined that the actual water temperature of the water storage tank (100) is less than or equal to an upper limit water temperature of the water storage tank (100) and greater than or equal to the lower limit water temperature of the water storage tank (100); and the second relationship condition is that it is determined that the actual outlet water temperature of the cooling tower (300) is greater than an upper limit outlet water temperature of the cooling tower (300).

4. The control method of a water chiller according to claim 3, characterized by, The second relationship condition further comprises: counting a first duration for which the actual outlet water temperature of the cooling tower (300) is greater than the upper limit outlet water temperature of the cooling tower (300), and determining that the first duration is greater than a first set time.

5. The control method of a water chiller according to claim 2, characterized by, The controlling the chiller unit to switch between the first operation mode and the second operation mode according to the relationship between the actual water temperature of the water storage tank (100) and the water temperature threshold of the water storage tank (100) and the relationship between the actual outlet water temperature of the cooling tower (300) and the outlet water temperature threshold of the cooling tower (300) further comprises: satisfying the first relationship condition and a third relationship condition, and controlling the chiller unit to switch to the first operation mode; the first relationship condition is that it is determined that the actual water temperature of the water storage tank (100) is less than or equal to the upper limit water temperature of the water storage tank (100) and greater than or equal to the lower limit water temperature of the water storage tank (100); the third relationship condition is that it is determined that the actual outlet water temperature of the cooling tower (300) is less than a lower limit outlet water temperature of the cooling tower (300).

6. The control method of a water chiller according to claim 5, characterized by, The third relationship condition further comprises: counting a second duration for which the actual outlet water temperature of the cooling tower (300) is less than the lower limit outlet water temperature of the cooling tower (300), and determining that the second duration is greater than a second set time.

7. The control method of a water chiller according to claim 2, characterized by, The control of the water chilling unit switching between the first operation mode and the second operation mode according to the relationship between the actual water temperature of the water storage tank (100) and the water temperature threshold of the water storage tank (100), and the relationship between the actual outlet water temperature of the cooling tower (300) and the outlet water temperature threshold of the cooling tower (300) further comprises: Satisfying the first relationship condition and the fourth relationship condition, returning to obtain the actual water temperature of the water storage tank (100) and the actual outlet water temperature of the cooling tower (300); The first relationship condition is to determine that the actual water temperature of the water storage tank (100) is less than or equal to the upper limit water temperature of the water storage tank (100), and the actual water temperature of the water storage tank (100) is greater than or equal to the lower limit water temperature of the water storage tank (100); The fourth relationship condition is to determine that the actual outlet water temperature of the cooling tower (300) is less than or equal to the outlet upper limit temperature of the cooling tower (300), and the actual outlet water temperature of the cooling tower (300) is greater than or equal to the outlet lower limit temperature of the cooling tower (300).

8. The control method of the water chiller according to claim 2, characterized by, The control of the water chilling unit switching between the first operation mode and the second operation mode according to the relationship between the actual water temperature of the water storage tank (100) and the water temperature threshold of the water storage tank (100), and the relationship between the actual outlet water temperature of the cooling tower (300) and the outlet water temperature threshold of the cooling tower (300) further comprises: Determine that the actual water temperature of the water storage tank (100) is greater than the upper limit water temperature of the water storage tank (100), and control the water chilling unit to switch to the second operation mode.

9. A control device of a water chiller, characterized by comprising: Comprise: The acquisition module is used for acquiring the actual water temperature of the water storage tank (100) and the actual outlet water temperature of the cooling tower (300); The control module is used for controlling the water chilling unit to switch between the first operation mode and the second operation mode according to the relationship between the actual water temperature of the water storage tank (100) and the water temperature threshold of the water storage tank (100), and the relationship between the actual outlet water temperature of the cooling tower (300) and the outlet water temperature threshold of the cooling tower (300); The first operation mode is that the cooling tower (300) provides cooling water for the heat exchanger (200), and the second operation mode is that the cooling tower (300) provides refrigeration for the cold machine (400), and the cold machine (400) provides chilled water for the heat exchanger (200).

10. A water chiller, characterized by, The control device as claimed in claim 9 or the control method of the water chilling unit as claimed in any one of claims 1 to 8 is included.

Images