CN107655141B - Water cooling unit and control method and control device thereof - Google Patents
Water cooling unit and control method and control device thereof Download PDFInfo
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- CN107655141B CN107655141B CN201710824166.9A CN201710824166A CN107655141B CN 107655141 B CN107655141 B CN 107655141B CN 201710824166 A CN201710824166 A CN 201710824166A CN 107655141 B CN107655141 B CN 107655141B
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Abstract
The invention discloses a water cooling unit and a control method and a control device thereof, wherein the control method comprises the following steps: detecting the water outlet temperature of the water chiller unit and acquiring the target water outlet temperature of the water chiller unit; acquiring a difference value between the water outlet temperature and a target water outlet temperature, and acquiring a water outlet temperature change rate according to the water outlet temperature of the water cooling unit; and adjusting the running frequency of the water cooling unit according to the difference, and controlling the frequency adjusting period according to the change rate of the outlet water temperature in the process of adjusting the running frequency. The control method can adjust the running frequency of the water cooling unit according to the outlet water temperature, the target outlet water temperature and the outlet water temperature change rate of the water cooling unit, ensure that the unit runs at the optimal frequency under the condition of meeting the refrigerating capacity requirement, and reduce energy consumption.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method of a water cooling unit, a control device of the water cooling unit and the water cooling unit with the control device.
Background
Along with the increasing concern of people on the energy consumption of the air conditioner, the variable frequency control realizes the output of the refrigerating capacity under different loads by stably adjusting the refrigerating capacity of the variable frequency control, and becomes a mainstream control mode of the air conditioner industry. However, the conventional frequency adjustment method can only increase and decrease the fixed period frequency, and cannot achieve precise frequency control.
Disclosure of Invention
The present invention is directed to solving at least one of the problems in the art to some extent. Therefore, a first object of the present invention is to provide a control method for a water chiller, which can adjust an operating frequency of the water chiller according to an outlet water temperature of the water chiller, a target outlet water temperature, and an outlet water temperature change rate, so as to ensure that the water chiller operates at an optimal frequency and reduce energy consumption under the condition that a demand for cooling capacity is met.
A second object of the invention is to propose a non-transitory computer-readable storage medium.
The third purpose of the invention is to provide a control device of the water chilling unit.
The fourth purpose of the invention is to provide a water cooling unit.
In order to achieve the above object, a method for controlling a water chiller according to an embodiment of the first aspect of the present invention includes the following steps: detecting the water outlet temperature of the water cooling unit, and acquiring the target water outlet temperature of the water cooling unit; acquiring a difference value between the water outlet temperature and the target water outlet temperature, and acquiring a water outlet temperature change rate according to the water outlet temperature of the water cooling unit; and adjusting the running frequency of the water cooling unit according to the difference, and controlling a frequency adjusting period according to the change rate of the outlet water temperature in the process of adjusting the running frequency.
According to the control method of the water chilling unit, the water outlet temperature of the water chilling unit is detected in real time, the target water outlet temperature of the water chilling unit is obtained, the difference value between the water outlet temperature and the target water outlet temperature is obtained, the change rate of the water outlet temperature is obtained according to the water outlet temperature of the water chilling unit, the operation frequency of the water chilling unit is adjusted according to the difference value, and in the process of adjusting the operation frequency, the frequency adjusting period is controlled according to the change rate of the water outlet temperature. Therefore, the method can adjust the running frequency of the water cooling unit according to the outlet water temperature, the target outlet water temperature and the outlet water temperature change rate of the water cooling unit, ensure that the unit runs at the optimal frequency under the condition of meeting the refrigerating capacity requirement, and reduce energy consumption.
In addition, the control method for the water chiller unit according to the above embodiment of the present invention may further have the following additional technical features:
according to one embodiment of the invention, when the difference is greater than or equal to a first preset temperature, the operating frequency is subjected to increasing adjustment according to a first frequency adjustment period.
According to an embodiment of the present invention, when the difference is greater than or equal to a second preset temperature and less than a first preset temperature, wherein if the outlet water temperature is in an ascending trend or remains unchanged, the operating frequency is increased and adjusted according to a second frequency adjustment period, wherein the second frequency adjustment period is less than or equal to the first frequency adjustment period; if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is less than or equal to a first preset value, increasing and adjusting the operating frequency according to a third frequency adjusting period, wherein the third frequency adjusting period is less than the second frequency adjusting period; if the outlet water temperature is in a descending trend, and the change rate of the outlet water temperature is greater than a first preset value and less than or equal to a second preset value, performing increasing adjustment on the operating frequency according to a fourth frequency adjustment period, wherein the fourth frequency adjustment period is less than the third frequency adjustment period; and if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is greater than a second preset value, controlling the water cooling unit to keep the current running frequency unchanged.
According to an embodiment of the present invention, when the difference is greater than or equal to a third preset temperature and less than a second preset temperature, wherein if the outlet water temperature is in an ascending trend or remains unchanged, the operating frequency is adjusted in an increasing manner according to a fifth frequency adjustment period, wherein the fifth frequency adjustment period is less than or equal to the third frequency adjustment period and greater than the fourth frequency adjustment period; if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is less than or equal to a first preset value, increasing and adjusting the running frequency according to a sixth frequency adjusting period, wherein the sixth frequency adjusting period is less than or equal to the fourth frequency adjusting period; and if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is greater than a first preset value, controlling the water cooling unit to keep the current running frequency unchanged.
According to an embodiment of the invention, when the difference is smaller than a fourth preset temperature, the fourth preset temperature is smaller than the third preset temperature, wherein if the outlet water temperature is in an ascending trend, the water chiller is controlled to keep the current operating frequency unchanged; if the outlet water temperature is kept unchanged, reducing and adjusting the operating frequency according to a seventh frequency adjusting period; if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is less than or equal to a first preset value, increasing and adjusting the operating frequency according to an eighth frequency adjusting period, wherein the eighth frequency adjusting period is greater than the seventh frequency adjusting period; and if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is greater than a first preset value, increasing and adjusting the running frequency according to a ninth frequency adjusting period, wherein the ninth frequency adjusting period is greater than the eighth frequency adjusting period.
To achieve the above object, a second embodiment of the present invention provides a non-transitory computer-readable storage medium, on which a computer program is stored, and the computer program is executed by a processor to implement the control method.
By executing the control method, the non-transitory computer-readable storage medium of the embodiment of the invention can adjust the operation frequency of the water cooling unit according to the outlet water temperature, the target outlet water temperature and the outlet water temperature change rate of the water cooling unit, ensure that the unit operates at the optimal frequency under the condition of meeting the refrigerating capacity requirement, and reduce the energy consumption.
In order to achieve the above object, a third aspect of the present invention provides a control device for a water chiller, including: the detection module is used for detecting the outlet water temperature of the water cooling unit; the first acquisition module is used for acquiring the target outlet water temperature of the water chilling unit; the second obtaining module is used for obtaining the difference value between the water outlet temperature and the target water outlet temperature and obtaining the change rate of the water outlet temperature according to the water outlet temperature of the water cooling unit; and the frequency regulation control module is used for regulating the running frequency of the water cooling unit according to the difference value and controlling the frequency regulation period according to the change rate of the outlet water temperature in the process of regulating the running frequency.
According to the control device of the water cooling unit, the detection module is used for detecting the water outlet temperature of the water cooling unit, the first acquisition module is used for acquiring the target water outlet temperature of the water cooling unit, the second acquisition module is used for acquiring the difference value between the water outlet temperature and the target water outlet temperature, the change rate of the water outlet temperature is acquired according to the water outlet temperature of the water cooling unit, the frequency adjusting control module is used for adjusting the operation frequency of the water cooling unit according to the difference value, and in the process of adjusting the operation frequency, the frequency adjusting period is controlled according to the change rate of the water outlet temperature. Therefore, the device can adjust the running frequency of the water cooling unit according to the water outlet temperature, the target water outlet temperature and the water outlet temperature change rate of the water cooling unit, and can ensure that the unit runs at the optimal frequency and reduce energy consumption under the condition of meeting the refrigerating capacity requirement.
In addition, the control device for the water chiller unit according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, the frequency adjustment control module is further configured to perform an increase adjustment on the operating frequency according to a first frequency adjustment period when the difference is greater than or equal to a first preset temperature.
According to an embodiment of the present invention, the frequency adjustment control module is further configured to, when the difference is greater than or equal to a second preset temperature and less than a first preset temperature, perform an increase adjustment on the operating frequency according to a second frequency adjustment period if the outlet water temperature is in an increasing trend or remains unchanged, where the second frequency adjustment period is less than or equal to the first frequency adjustment period; if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is less than or equal to a first preset value, increasing and adjusting the operating frequency according to a third frequency adjusting period, wherein the third frequency adjusting period is less than the second frequency adjusting period; if the outlet water temperature is in a descending trend, and the change rate of the outlet water temperature is greater than a first preset value and less than or equal to a second preset value, performing increasing adjustment on the operating frequency according to a fourth frequency adjustment period, wherein the fourth frequency adjustment period is less than the third frequency adjustment period; and if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is greater than a second preset value, controlling the water cooling unit to keep the current running frequency unchanged.
According to an embodiment of the present invention, the frequency adjustment control module is further configured to, when the difference is greater than or equal to a third preset temperature and less than a second preset temperature, perform an increase adjustment on the operating frequency according to a fifth frequency adjustment period if the outlet water temperature is in an increasing trend or remains unchanged, where the fifth frequency adjustment period is less than or equal to the third frequency adjustment period and greater than the fourth frequency adjustment period; if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is less than or equal to a first preset value, increasing and adjusting the running frequency according to a sixth frequency adjusting period, wherein the sixth frequency adjusting period is less than or equal to the fourth frequency adjusting period; and if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is greater than a first preset value, controlling the water cooling unit to keep the current running frequency unchanged.
According to an embodiment of the present invention, the frequency adjustment control module is further configured to, when the difference is smaller than a fourth preset temperature, lower than the third preset temperature, wherein if the effluent temperature is in an increasing trend, control the water chiller to keep the current operating frequency unchanged; if the outlet water temperature is kept unchanged, reducing and adjusting the operating frequency according to a seventh frequency adjusting period; if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is less than or equal to a first preset value, increasing and adjusting the operating frequency according to an eighth frequency adjusting period, wherein the eighth frequency adjusting period is greater than the seventh frequency adjusting period; and if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is greater than a first preset value, increasing and adjusting the running frequency according to a ninth frequency adjusting period, wherein the ninth frequency adjusting period is greater than the eighth frequency adjusting period.
In order to achieve the above object, a fourth aspect of the present invention provides a water chiller, which includes the control device of the water chiller.
According to the water cooling unit provided by the embodiment of the invention, through the control device of the water cooling unit, the running frequency of the unit can be adjusted according to the outlet water temperature, the target outlet water temperature and the outlet water temperature change rate of the water cooling unit, so that the unit is ensured to run at the optimal frequency under the condition of meeting the refrigerating capacity requirement, and the energy consumption is reduced.
Drawings
Fig. 1 is a flowchart of a control method of a water chiller unit according to an embodiment of the present invention; and
fig. 2 is a block diagram illustrating a control apparatus of a water chiller according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A control method of a water chiller, a control device of the water chiller, and a water chiller having the control device according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 is a flowchart of a control method of a water chiller according to an embodiment of the present invention.
As shown in fig. 1, the method for controlling a water chiller according to an embodiment of the present invention may include the following steps:
and S1, detecting the water outlet temperature of the water chiller unit and acquiring the target water outlet temperature of the water chiller unit.
Specifically, the water cooling unit can comprise a compressor, an evaporator, a condenser and an expansion valve, so that the refrigerating and heating effects of the unit are realized. The outlet water temperature of the water chilling unit can be the outlet temperature of the evaporator, and the outlet water temperature of the water chilling unit can be obtained through a temperature sensor arranged at the outlet of the evaporator. And simultaneously acquiring the target outlet water temperature of the water chiller unit, wherein the target outlet water temperature can be preset by a user and is stored in the water chiller unit.
And S2, acquiring the difference between the water outlet temperature and the target water outlet temperature, and acquiring the change rate of the water outlet temperature according to the water outlet temperature of the water cooling unit.
And S3, adjusting the running frequency of the water chiller unit according to the difference, and controlling the frequency adjusting period according to the change rate of the outlet water temperature in the process of adjusting the running frequency.
Specifically, after the water outlet temperature of the water cooling unit and the target water outlet temperature are obtained, the temperature difference between the water outlet temperature and the target water outlet temperature is calculated, the change rate of the water outlet temperature is obtained according to the water outlet temperature, and then the difference is judged. And when the difference value is smaller than the certain value, the operating frequency of the water cooling unit is reduced and adjusted. In order to improve the precision of the adjustment of the running frequency, in the process of adjusting the running frequency, the frequency adjustment period is also controlled according to the change rate of the temperature of the outlet water, namely, the running frequency of the water cooling unit is increased by the adjustment period and is reduced by the adjustment period. Therefore, on the premise of ensuring the refrigerating capacity, the frequency control period is adjusted, the stable control of the water temperature is realized, the compressor can be ensured to operate at the optimal rotating speed, and the energy consumption is reduced.
How to calculate the adjustment period of the frequency increase or decrease according to the difference between the leaving water temperature and the target leaving water temperature, and the rate of change of the leaving water temperature will be described in detail below.
Firstly, a calculation method for increasing the adjustment period of the running frequency of the water chiller is introduced.
According to one embodiment of the present invention, when the difference is equal to or greater than the first preset temperature, the operating frequency is incrementally adjusted according to a first frequency adjustment period. The first preset temperature and the first frequency adjusting period can be calibrated according to actual conditions.
Further, when the difference value is greater than or equal to a second preset temperature and less than the first preset temperature, if the outlet water temperature is in an ascending trend or remains unchanged, the operation frequency is subjected to increasing adjustment according to a second frequency adjustment period. And if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is less than or equal to the first preset value, increasing and adjusting the operating frequency according to the third frequency adjusting period. And if the outlet water temperature is in a descending trend, and the change rate of the outlet water temperature is greater than the first preset value and less than or equal to the second preset value, increasing and adjusting the operating frequency according to a fourth frequency adjustment period. And if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is greater than a second preset value, controlling the water cooling unit to keep the current running frequency unchanged. The second preset temperature, the second frequency adjusting period, the third frequency adjusting period and the fourth frequency adjusting period can be calibrated according to actual conditions, and the second frequency adjusting period is less than or equal to the first frequency adjusting period, namely, the second frequency adjusting period is more than or equal to the second frequency adjusting period, the third frequency adjusting period and the fourth frequency adjusting period.
Further, when the difference value is greater than or equal to a third preset temperature and less than a second preset temperature, wherein if the outlet water temperature is in an ascending trend or remains unchanged, the operation frequency is subjected to increasing adjustment according to a fifth frequency adjustment period. And if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is less than or equal to the first preset value, increasing and adjusting the operating frequency according to a sixth frequency adjusting period. And if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is greater than a first preset value, controlling the water cooling unit to keep the current running frequency unchanged. The third preset temperature, the fifth frequency adjusting period and the sixth frequency adjusting period can be calibrated according to actual conditions, and the third frequency adjusting period is more than or equal to the fifth frequency adjusting period, the fourth frequency adjusting period and the sixth frequency adjusting period.
Specifically, according to the difference between the outlet water temperature (the real-time detection value) and the target outlet water temperature (the user set value) and the outlet water temperature change rate, the operation frequency of the water chiller unit can be increased or kept unchanged, and the frequency adjustment period can be specifically divided into three cases.
In the first case: when the difference value is greater than or equal to the first preset temperature a1 (set value), it indicates that the difference between the current outlet water temperature and the target outlet water temperature is large, and the difference value can be directly determined as the increase adjustment of the operating frequency of the water chiller unit, and the increase adjustment of the operating frequency is performed according to the first frequency adjustment period B1.
In the second case: when the difference between the second preset temperature A2 and the second preset temperature is less than A1, the difference between the current water outlet temperature and the target water outlet temperature is large, and the change conditions of the current water outlet temperature and the change rate of the water outlet temperature can be further judged. When the current outlet water temperature is in an ascending trend or keeps constant, the difference value is increased or constant, at this time, the operation frequency of the water chilling unit can be determined to be increased and adjusted, and the operation frequency is increased and adjusted according to a second frequency adjustment period B2. When the current outlet water temperature drop rate is smaller than or equal to the first preset value C1, the difference drop rate is smaller, and at this time, the operating frequency may be increased and adjusted according to a smaller frequency adjustment period, such as the third frequency adjustment period B3. When the C1 is less than the current water outlet temperature drop rate and less than or equal to the second preset value C2, the operation frequency can be increased and adjusted according to a fourth frequency adjusting period B4 which is less than B3. When the current water outlet temperature drop rate is larger than C2, the current water outlet temperature drop rate is higher, and the water cooling unit can be controlled to keep the current running frequency unchanged.
In the third case: when the difference between the third preset temperature A3 and the third preset temperature is less than A2, the difference between the current effluent temperature and the target effluent temperature is not large, and the change conditions of the current effluent temperature and the change rate of the effluent temperature can be further judged. When the current outlet water temperature is in an ascending trend or keeps unchanged, the difference value is increased or unchanged, and the operation frequency can be subjected to increasing adjustment according to a fifth frequency adjustment period B5 which is less than or equal to B3 and is greater than B4. When the current outlet water temperature drop rate is less than or equal to C1, the difference drop rate is smaller, and the operation frequency can be increased and adjusted according to a smaller frequency adjustment period, such as a sixth frequency adjustment period B6 which is smaller than B4. When the current water outlet temperature drop rate is larger than C1, the current water outlet temperature drop rate is changed quickly relative to the difference value, and the water cooling unit can be controlled to keep the current running frequency unchanged.
The calculation method for reducing the adjustment period of the operation frequency of the water chiller unit is described next.
According to another embodiment of the invention, when the difference value is less than a fourth preset temperature, the fourth preset temperature is less than a third preset temperature, wherein if the outlet water temperature is in an ascending trend, the water chiller is controlled to keep the current operating frequency unchanged. And if the outlet water temperature is kept unchanged, performing reduction adjustment on the running frequency according to a seventh frequency adjustment period. And if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is less than or equal to the first preset value, increasing and adjusting the operating frequency according to the eighth frequency adjustment period. And if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is greater than the first preset value, increasing and adjusting the operating frequency according to a ninth frequency adjusting period. The fourth preset temperature, the seventh frequency regulation period, the eighth frequency regulation period and the ninth frequency regulation period can be calibrated according to actual conditions, and the ninth frequency regulation period is greater than the eighth frequency regulation period and greater than the seventh frequency regulation period.
Specifically, when the difference is less than the fourth preset temperature a4(a4 < A3), it is indicated that the difference between the current outlet water temperature and the target outlet water temperature is small, and the change conditions of the current outlet water temperature and the change rate of the outlet water temperature can be further determined. When the current outlet water temperature is in an ascending trend, the difference value is small, and at the moment, the water cooling unit can be controlled to keep the current running frequency unchanged. To reduce power consumption while the current effluent temperature remains constant, the operating frequency may be down-regulated in accordance with a smaller frequency regulation period, such as the seventh frequency regulation period B7. When the current outlet water temperature drop rate is less than or equal to C1, the difference drop rate is not large, and in order to prevent the current outlet water temperature from being less than the target outlet water temperature, the operation frequency can be reduced and adjusted according to an eighth frequency adjustment period B8 which is greater than B7. When the current outlet water temperature drop rate is larger than C1, it is indicated that the current outlet water temperature drop rate changes faster relative to the difference value, and in order to meet the refrigeration requirement, the current operating frequency of the water chiller unit needs to be increased and adjusted, and the operating frequency needs to be increased and adjusted according to a ninth frequency adjustment period B9 which is larger than B8.
Therefore, the control method of the water cooling unit provided by the embodiment of the invention can greatly reduce the severe fluctuation of the water temperature under the condition of meeting the refrigeration requirement, ensure that the unit operates at the optimal frequency and reduce the energy consumption.
In summary, according to the control method of the water chiller according to the embodiment of the present invention, firstly, the outlet water temperature of the water chiller is detected in real time, the target outlet water temperature of the water chiller is obtained, and the difference between the outlet water temperature and the target outlet water temperature is obtained, then the outlet water temperature change rate is obtained according to the outlet water temperature of the water chiller, the operation frequency of the water chiller is adjusted according to the difference, and in the process of adjusting the operation frequency, the frequency adjustment period is controlled according to the outlet water temperature change rate. Therefore, the method can adjust the running frequency of the water cooling unit according to the outlet water temperature, the target outlet water temperature and the outlet water temperature change rate of the water cooling unit, ensure that the unit runs at the optimal frequency under the condition of meeting the refrigerating capacity requirement, and reduce energy consumption.
Fig. 2 is a block diagram illustrating a control apparatus of a water chiller according to an embodiment of the present invention. As shown in fig. 2, the control device of the water chiller according to the embodiment of the present invention may include: the device comprises a detection module 10, a first acquisition module 20, a second acquisition module 30 and a frequency adjustment control module 40.
The detection module 10 is used for detecting the outlet water temperature of the water cooling unit. The first obtaining module 20 is configured to obtain a target outlet water temperature of the water chiller. The second obtaining module 30 is configured to obtain a difference between the water outlet temperature and the target water outlet temperature, and obtain a change rate of the water outlet temperature according to the water outlet temperature of the water chiller. The frequency regulation control module 40 is used for regulating the operation frequency of the water cooling unit according to the difference value, and controlling the frequency regulation period according to the change rate of the outlet water temperature in the process of regulating the operation frequency.
According to an embodiment of the present invention, the frequency adjustment control module 40 is further configured to perform an increase adjustment on the operating frequency according to a first frequency adjustment period when the difference is greater than or equal to a first preset temperature.
According to an embodiment of the present invention, the frequency adjustment control module 40 is further configured to, when the difference is greater than or equal to a second preset temperature and less than the first preset temperature, perform an increase adjustment on the operating frequency according to a second frequency adjustment period if the outlet water temperature is in an increasing trend or remains unchanged, wherein the second frequency adjustment period is less than or equal to the first frequency adjustment period. And if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is less than or equal to the first preset value, increasing and adjusting the operating frequency according to a third frequency adjusting period, wherein the third frequency adjusting period is less than the second frequency adjusting period. And if the outlet water temperature is in a descending trend, and the change rate of the outlet water temperature is greater than the first preset value and less than or equal to the second preset value, increasing and adjusting the operating frequency according to a fourth frequency adjusting period, wherein the fourth frequency adjusting period is less than the third frequency adjusting period. And if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is greater than a second preset value, controlling the water cooling unit to keep the current running frequency unchanged.
According to an embodiment of the present invention, the frequency adjustment control module 40 is further configured to, when the difference is greater than or equal to a third preset temperature and less than a second preset temperature, perform an increase adjustment on the operating frequency according to a fifth frequency adjustment period if the outlet water temperature is in an increasing trend or remains unchanged, wherein the fifth frequency adjustment period is less than or equal to the third frequency adjustment period and greater than the fourth frequency adjustment period. And if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is less than or equal to the first preset value, increasing and adjusting the running frequency according to a sixth frequency adjusting period, wherein the sixth frequency adjusting period is less than or equal to a fourth frequency adjusting period. And if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is greater than a first preset value, controlling the water cooling unit to keep the current running frequency unchanged.
According to an embodiment of the present invention, the frequency adjustment control module 40 is further configured to, when the difference is smaller than a fourth preset temperature, control the water chiller to keep the current operating frequency unchanged if the outlet water temperature is in an increasing trend. And if the outlet water temperature is kept unchanged, performing reduction adjustment on the running frequency according to a seventh frequency adjustment period. And if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is less than or equal to the first preset value, increasing and adjusting the operating frequency according to an eighth frequency adjusting period, wherein the eighth frequency adjusting period is greater than the seventh frequency adjusting period. And if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is greater than the first preset value, increasing and adjusting the running frequency according to a ninth frequency adjusting period, wherein the ninth frequency adjusting period is greater than the eighth frequency adjusting period.
It should be noted that, for details that are not disclosed in the control device of the water chiller according to the embodiment of the present invention, please refer to details that are disclosed in the control method of the water chiller according to the embodiment of the present invention, and detailed description thereof is omitted here.
According to the control device of the water cooling unit, the detection module is used for detecting the water outlet temperature of the water cooling unit, the first acquisition module is used for acquiring the target water outlet temperature of the water cooling unit, the second acquisition module is used for acquiring the difference value between the water outlet temperature and the target water outlet temperature, the change rate of the water outlet temperature is acquired according to the water outlet temperature of the water cooling unit, the frequency adjusting control module is used for adjusting the operation frequency of the water cooling unit according to the difference value, and in the process of adjusting the operation frequency, the frequency adjusting period is controlled according to the change rate of the water outlet temperature. Therefore, the device can adjust the running frequency of the water cooling unit according to the water outlet temperature, the target water outlet temperature and the water outlet temperature change rate of the water cooling unit, and can ensure that the unit runs at the optimal frequency and reduce energy consumption under the condition of meeting the refrigerating capacity requirement.
In addition, an embodiment of the present invention also proposes a non-transitory computer-readable storage medium on which a computer program is stored, which when executed by a processor implements the control method described above.
By executing the control method, the non-transitory computer-readable storage medium of the embodiment of the invention can adjust the operation frequency of the water cooling unit according to the outlet water temperature, the target outlet water temperature and the outlet water temperature change rate of the water cooling unit, ensure that the unit operates at the optimal frequency under the condition of meeting the refrigerating capacity requirement, and reduce the energy consumption.
In addition, the embodiment of the invention also provides a water chiller unit, which comprises the control device of the water chiller unit.
According to the water cooling unit provided by the embodiment of the invention, through the control device of the water cooling unit, the running frequency of the unit can be adjusted according to the outlet water temperature, the target outlet water temperature and the outlet water temperature change rate of the water cooling unit, so that the unit is ensured to run at the optimal frequency under the condition of meeting the refrigerating capacity requirement, and the energy consumption is reduced.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (8)
1. A control method of a water chilling unit is characterized by comprising the following steps:
detecting the water outlet temperature of the water cooling unit, and acquiring the target water outlet temperature of the water cooling unit;
acquiring a difference value between the water outlet temperature and the target water outlet temperature, and acquiring a water outlet temperature change rate according to the water outlet temperature of the water cooling unit;
adjusting the running frequency of the water chiller unit according to the difference, and controlling a frequency adjusting period according to the change rate of the outlet water temperature in the process of adjusting the running frequency, wherein,
when the difference value is larger than or equal to a first preset temperature, increasing and adjusting the operating frequency according to a first frequency adjusting period;
when the difference is greater than or equal to a second preset temperature and less than a first preset temperature, wherein,
if the outlet water temperature is in an ascending trend or keeps unchanged, increasing and adjusting the running frequency according to a second frequency adjusting period, wherein the second frequency adjusting period is less than or equal to the first frequency adjusting period;
if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is less than or equal to a first preset value, increasing and adjusting the operating frequency according to a third frequency adjusting period, wherein the third frequency adjusting period is less than the second frequency adjusting period;
if the outlet water temperature is in a descending trend, and the change rate of the outlet water temperature is greater than a first preset value and less than or equal to a second preset value, performing increasing adjustment on the operating frequency according to a fourth frequency adjustment period, wherein the fourth frequency adjustment period is less than the third frequency adjustment period;
and if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is greater than a second preset value, controlling the water cooling unit to keep the current running frequency unchanged.
2. The method for controlling a water chiller according to claim 1, wherein when the difference is greater than or equal to a third predetermined temperature and less than a second predetermined temperature, wherein,
if the outlet water temperature is in an ascending trend or keeps unchanged, increasing and adjusting the running frequency according to a fifth frequency adjusting period, wherein the fifth frequency adjusting period is less than or equal to the third frequency adjusting period and is greater than the fourth frequency adjusting period;
if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is less than or equal to a first preset value, increasing and adjusting the running frequency according to a sixth frequency adjusting period, wherein the sixth frequency adjusting period is less than or equal to the fourth frequency adjusting period;
and if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is greater than a first preset value, controlling the water cooling unit to keep the current running frequency unchanged.
3. The method as claimed in claim 2, wherein when the difference is less than a fourth preset temperature, the fourth preset temperature is less than the third preset temperature, wherein,
if the outlet water temperature is in an ascending trend, controlling the water cooling unit to keep the current running frequency unchanged;
if the outlet water temperature is kept unchanged, reducing and adjusting the operating frequency according to a seventh frequency adjusting period;
if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is less than or equal to a first preset value, increasing and adjusting the operating frequency according to an eighth frequency adjusting period, wherein the eighth frequency adjusting period is greater than the seventh frequency adjusting period;
and if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is greater than a first preset value, increasing and adjusting the running frequency according to a ninth frequency adjusting period, wherein the ninth frequency adjusting period is greater than the eighth frequency adjusting period.
4. A non-transitory computer-readable storage medium on which a computer program is stored, the program, when executed by a processor, implementing the control method according to any one of claims 1 to 3.
5. A control device for a water chiller unit, comprising:
the detection module is used for detecting the outlet water temperature of the water cooling unit;
the first acquisition module is used for acquiring the target outlet water temperature of the water chilling unit;
the second obtaining module is used for obtaining the difference value between the water outlet temperature and the target water outlet temperature and obtaining the change rate of the water outlet temperature according to the water outlet temperature of the water cooling unit;
a frequency regulation control module for regulating the operation frequency of the water cooling unit according to the difference value and controlling the frequency regulation period according to the change rate of the outlet water temperature in the process of regulating the operation frequency, wherein,
the frequency adjustment control module is further used for increasing and adjusting the operating frequency according to a first frequency adjustment period when the difference value is larger than or equal to a first preset temperature;
the frequency adjustment control module is further configured to, when the difference is greater than or equal to a second preset temperature and less than a first preset temperature, wherein,
if the outlet water temperature is in an ascending trend or keeps unchanged, increasing and adjusting the running frequency according to a second frequency adjusting period, wherein the second frequency adjusting period is less than or equal to the first frequency adjusting period;
if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is less than or equal to a first preset value, increasing and adjusting the operating frequency according to a third frequency adjusting period, wherein the third frequency adjusting period is less than the second frequency adjusting period;
if the outlet water temperature is in a descending trend, and the change rate of the outlet water temperature is greater than a first preset value and less than or equal to a second preset value, performing increasing adjustment on the operating frequency according to a fourth frequency adjustment period, wherein the fourth frequency adjustment period is less than the third frequency adjustment period;
and if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is greater than a second preset value, controlling the water cooling unit to keep the current running frequency unchanged.
6. The control device of the water chilling unit according to claim 5, wherein the frequency adjustment control module is further configured to, when the difference is greater than or equal to a third preset temperature and less than a second preset temperature,
if the outlet water temperature is in an ascending trend or keeps unchanged, increasing and adjusting the running frequency according to a fifth frequency adjusting period, wherein the fifth frequency adjusting period is less than or equal to the third frequency adjusting period and is greater than the fourth frequency adjusting period;
if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is less than or equal to a first preset value, increasing and adjusting the running frequency according to a sixth frequency adjusting period, wherein the sixth frequency adjusting period is less than or equal to the fourth frequency adjusting period;
and if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is greater than a first preset value, controlling the water cooling unit to keep the current running frequency unchanged.
7. The control device of the water chiller unit according to claim 6, wherein the frequency adjustment control module is further configured to, when the difference is less than a fourth predetermined temperature, lower than the third predetermined temperature, wherein,
if the outlet water temperature is in an ascending trend, controlling the water cooling unit to keep the current running frequency unchanged;
if the outlet water temperature is kept unchanged, reducing and adjusting the operating frequency according to a seventh frequency adjusting period;
if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is less than or equal to a first preset value, increasing and adjusting the operating frequency according to an eighth frequency adjusting period, wherein the eighth frequency adjusting period is greater than the seventh frequency adjusting period;
and if the outlet water temperature is in a descending trend and the change rate of the outlet water temperature is greater than a first preset value, increasing and adjusting the running frequency according to a ninth frequency adjusting period, wherein the ninth frequency adjusting period is greater than the eighth frequency adjusting period.
8. A water chiller unit comprising control means for a water chiller unit as claimed in any one of claims 5 to 7.
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| CN201710824166.9A CN107655141B (en) | 2017-09-13 | 2017-09-13 | Water cooling unit and control method and control device thereof |
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| CN108800423A (en) * | 2018-05-25 | 2018-11-13 | 珠海格力电器股份有限公司 | Air conditioning control method, control device and the air-conditioning using this method |
| CN113606782B (en) * | 2021-07-30 | 2022-10-28 | 宁波奥克斯电气股份有限公司 | Variable frequency control method and device of heat pump unit, storage medium and heat pump unit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009174746A (en) * | 2008-01-23 | 2009-08-06 | Shinryo Corp | Air supply temperature control system for clean room |
| CN103322646A (en) * | 2013-06-13 | 2013-09-25 | 浙江工业大学 | Return cooling water temperature predictive control method for central air conditioner |
| CN105387570A (en) * | 2015-11-30 | 2016-03-09 | 珠海格力电器股份有限公司 | Executive capability adjustment method and device of water chilling unit |
| CN105674489A (en) * | 2016-01-27 | 2016-06-15 | 深圳市奥宇节能技术股份有限公司 | Optimal control method and system of central air conditioner water pump |
| CN106524613A (en) * | 2016-11-14 | 2017-03-22 | 广东美的暖通设备有限公司 | Variable-frequency air-cooled heat pump unit and control method and device thereof |
-
2017
- 2017-09-13 CN CN201710824166.9A patent/CN107655141B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009174746A (en) * | 2008-01-23 | 2009-08-06 | Shinryo Corp | Air supply temperature control system for clean room |
| CN103322646A (en) * | 2013-06-13 | 2013-09-25 | 浙江工业大学 | Return cooling water temperature predictive control method for central air conditioner |
| CN105387570A (en) * | 2015-11-30 | 2016-03-09 | 珠海格力电器股份有限公司 | Executive capability adjustment method and device of water chilling unit |
| CN105674489A (en) * | 2016-01-27 | 2016-06-15 | 深圳市奥宇节能技术股份有限公司 | Optimal control method and system of central air conditioner water pump |
| CN106524613A (en) * | 2016-11-14 | 2017-03-22 | 广东美的暖通设备有限公司 | Variable-frequency air-cooled heat pump unit and control method and device thereof |
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