CN112665239A - Water chilling unit starting method and device and water chilling unit - Google Patents
Water chilling unit starting method and device and water chilling unit Download PDFInfo
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- CN112665239A CN112665239A CN202011420546.4A CN202011420546A CN112665239A CN 112665239 A CN112665239 A CN 112665239A CN 202011420546 A CN202011420546 A CN 202011420546A CN 112665239 A CN112665239 A CN 112665239A
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Abstract
The invention discloses a method and a device for starting a water chilling unit and the water chilling unit, belonging to the field of starting of water chilling units; the starting method comprises the following steps: the method comprises the steps of obtaining a temperature difference value between an actual outlet water temperature and a target outlet water temperature of chilled water when a unit is started, judging whether the temperature difference value is larger than a preset temperature difference value or not, and adjusting the frequency of a compressor in a quick starting mode according to the temperature difference value when the temperature difference value is larger than the preset temperature difference value. When the temperature difference value is larger than the preset temperature difference value when the unit is started, the load requirement of a user is high, and if the unit is started in a conventional starting mode, the starting is slow, and the user requirement cannot be responded quickly. This application adopts the temperature difference to adjust compressor frequency, risees compressor frequency fast, can the load demand of technical response user.
Description
Technical Field
The invention relates to a method for starting a water chilling unit, in particular to a method and a device for starting the water chilling unit and the water chilling unit.
Background
The natural cooling air-cooled water chiller is mostly used in a refrigerating system for cooling a data center, and has the characteristics of large heat productivity, large power density and high heat density. Therefore, the data center refrigeration system provides a demand for the air conditioner main unit to respond to the load demand quickly. The starting mode of the existing unit is fixed in adjustment amount and slow in adjustment after starting, user load requirements are not considered, and when the user load requirements are large, quick response cannot be achieved.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a method and a device for starting a water chilling unit and the water chilling unit, and aims to solve the problems that the adjustment quantity is fixed and slow after the starting mode of the existing unit is started, the user load demand is not considered, and when the user load demand is larger, the quick response cannot be realized.
The technical scheme adopted by the invention for solving the technical problems is as follows:
in a first aspect,
a starting method of a water chilling unit comprises the following steps:
acquiring a temperature difference value between an actual outlet water temperature and a target outlet water temperature of chilled water when a unit is started;
judging whether the temperature difference is larger than a preset temperature difference or not;
and when the temperature difference is larger than the preset temperature difference, adjusting the frequency of the compressor in a quick start mode according to the temperature difference.
Further, said adjusting the compressor frequency in a fast start mode based on said temperature difference comprises:
controlling the compressor to run at a starting frequency for a first preset duration;
and increasing the frequency of the compressor according to the temperature difference value every a second preset interval.
Further, when the compressor frequency is increased according to the temperature difference value every second preset time interval, the compressor frequency increase step is the first preset value multiplied by the temperature difference value every time.
Further, still include:
detecting the compressor frequency;
exiting the rapid start mode when the compressor frequency reaches a full load frequency.
Further, still include:
detecting an operating current of the compressor;
and when the running current is larger than the preset current, the quick starting mode is exited, and the frequency of the compressor is reduced according to the current difference value of the running current and the preset current.
Further, the reducing the compressor frequency according to the current difference between the operating current and the preset current comprises:
decreasing the compressor frequency once every third predetermined period of time; each compressor frequency reduction step is multiplied by the current difference by a second preset value.
Further, still include:
when the environment temperature is not lower than the preset environment temperature, the current difference value is obtained by subtracting the product of the maximum current and the first unloading coefficient from the running current;
when the environment temperature is lower than the preset environment temperature, the current difference value is obtained by subtracting the product of the maximum current and a second unloading coefficient from the running current;
the first unloading factor is greater than the second unloading factor.
Further, still include:
when the operating current is not greater than a preset current, acquiring an ambient temperature, a condensing temperature and an evaporating temperature;
and judging whether to exit the quick starting mode or not according to the environment temperature, the condensation temperature and the evaporation temperature, and reducing the frequency of the compressor.
Further, the determining whether to exit the fast start mode according to the ambient temperature, the condensing temperature, and the evaporating temperature, and reducing the frequency of the compressor includes:
when the ambient temperature is not lower than a preset ambient temperature within a continuous preset time, judging whether the difference value between the condensing temperature and the ambient temperature is greater than a third preset value;
if the difference value is greater than the preset value, the quick starting mode is exited, and the frequency of the compressor is reduced according to the difference value; if not, the compressor frequency is adjusted in a fast start mode.
Further, the reducing the compressor frequency according to the difference value comprises:
decreasing the compressor frequency once every fourth preset interval; each compressor frequency reduction step is a fourth preset value multiplied by the difference.
Further, the determining whether to exit the fast start mode according to the ambient temperature, the condensing temperature, and the evaporating temperature, and reducing the frequency of the compressor includes:
when the environment temperature is lower than the preset environment temperature within the continuous preset time, judging whether the evaporation temperature is lower than a fifth preset value or not;
if the target evaporation temperature is less than the target evaporation temperature, the quick starting mode is exited, and the frequency of the compressor is reduced according to the difference value of the target evaporation temperature and the absolute value of the evaporation temperature; if not, the compressor frequency is adjusted in a fast start mode.
Further, the reducing the compressor frequency according to the difference between the target evaporation temperature and the absolute value of the evaporation temperature comprises:
decreasing the compressor frequency once every fifth preset interval; each compressor frequency reduction step is a sixth preset value multiplied by the difference.
Further, the water chilling unit is a variable-frequency natural cooling air-cooled screw type water chilling unit.
In a second aspect of the present invention,
a chiller starting apparatus comprising:
the acquisition module is used for acquiring the temperature difference between the actual outlet water temperature and the target outlet water temperature of the chilled water when the unit is started;
the judging module is used for judging whether the temperature difference value is larger than a preset temperature difference value or not;
and the adjusting module is used for adjusting the frequency of the compressor in a quick starting mode according to the temperature difference when the temperature difference is larger than the preset temperature difference.
In a third aspect,
a chiller, comprising: the device according to the above technical solution.
This application adopts above technical scheme, possesses following beneficial effect at least:
the technical scheme of the application provides a water chilling unit starting method, a device and a water chilling unit, wherein the starting method comprises the following steps: the method comprises the steps of obtaining a temperature difference value between an actual outlet water temperature and a target outlet water temperature of chilled water when a unit is started, judging whether the temperature difference value is larger than a preset temperature difference value or not, and adjusting the frequency of a compressor in a quick starting mode according to the temperature difference value when the temperature difference value is larger than the preset temperature difference value. When the temperature difference value is larger than the preset temperature difference value when the unit is started, the load requirement of a user is high, and if the unit is started in a conventional starting mode, the starting is slow, and the user requirement cannot be responded quickly. This application adopts the temperature difference to adjust compressor frequency, risees compressor frequency fast, can the load demand of technical response user.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a variable-frequency natural cooling air-cooled screw chiller according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for starting a chiller according to an embodiment of the present invention;
fig. 3 is a structural diagram of a starting device of a water chilling unit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following detailed description of the technical solutions of the present invention is provided with reference to the accompanying drawings and examples. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present application.
In order to more clearly illustrate the implementation manner of the present application, the following examples are all described by taking a variable-frequency natural cooling air-cooled screw chiller as an example, and fig. 1 provides a schematic structural diagram of the variable-frequency natural cooling air-cooled screw chiller, wherein fig. 1 refers to a variable-frequency screw compressor; 2 is a condenser; 3 is a variable frequency fan; 4 is an electronic expansion valve; 5 is an evaporator; 6 is a natural cooling water pump; 7 is a natural cooling coil; 8 is an intermediate heat exchanger; e is a chilled water inlet pipe; f is a chilled water outlet pipe; wherein, the vapor compression refrigeration cycle is as follows: 1 frequency conversion screw compressor, 2 condenser, 3 frequency conversion fan, 4 electronic expansion valve, 5 evaporator and 1 frequency conversion screw compressor; the natural cooling circulation is as follows: 6 natural cooling water pump, 7 natural cooling coil, 8 intermediate heat exchanger, 6 natural cooling water pump.
Referring to fig. 2, an embodiment of the present invention provides a method for starting a chiller, including the following steps:
acquiring a temperature difference value between an actual outlet water temperature and a target outlet water temperature of chilled water when a unit is started;
judging whether the temperature difference is larger than a preset temperature difference or not;
and when the temperature difference is larger than the preset temperature difference, adjusting the frequency of the compressor in a quick start mode according to the temperature difference.
The embodiment of the invention provides a method for starting a water chilling unit, which comprises the following steps: the method comprises the steps of obtaining a temperature difference value between an actual outlet water temperature and a target outlet water temperature of chilled water when a unit is started, judging whether the temperature difference value is larger than a preset temperature difference value or not, and adjusting the frequency of a compressor in a quick starting mode according to the temperature difference value when the temperature difference value is larger than the preset temperature difference value. When the temperature difference value is larger than the preset temperature difference value when the unit is started, the load requirement of a user is high, and if the unit is started in a conventional starting mode, the starting is slow, and the user requirement cannot be responded quickly. This application adopts the temperature difference to adjust compressor frequency, risees compressor frequency fast, can the load demand of technical response user.
As a supplementary explanation to the above embodiment, adjusting the compressor frequency in the quick start mode according to the temperature difference includes:
controlling the compressor to run at a starting frequency for a first preset time period; and increasing the frequency of the compressor according to the temperature difference value every second preset time interval, wherein the step of increasing the frequency of the compressor every time is the first preset value multiplied by the temperature difference value. And when the compressor is subjected to frequency increase, increasing the temperature difference according to the real-time temperature difference, wherein the frequency increase step of each compressor is larger when the temperature difference is larger. The load demand of the user can be responded to quickly.
Under certain conditions, when the compression frequency is adjusted in a quick starting mode, the working condition of the unit is good, no matter the running current or the condensing temperature or the evaporating temperature meets the requirement, and the frequency of the compressor is detected at the moment; when the compressor frequency reaches the full load frequency, the fast start mode is exited.
But the compressor frequency increases faster due to the adjustment of the compressor frequency in the fast start mode. The operating current may exceed the allowable value, and the normal operation of the unit is influenced.
Therefore, some optional embodiments further comprise:
detecting the running current of the compressor;
and when the running current is greater than the preset current, the quick starting mode is exited, and the frequency of the compressor is reduced according to the current difference value of the running current and the preset current. Specifically, the compressor frequency is reduced once every third preset time interval; each compressor frequency reduction step is a second preset value multiplied by the current difference.
Wherein the current difference is equal to the actual operating current minus the product of the maximum current and the unloading factor. In the actual operation process, the environment temperatures are different, and the values of the adopted unloading coefficients are different, so that when the environment temperature is not lower than the preset environment temperature, the current difference value is the value obtained by subtracting the product of the maximum current and the first unloading coefficient from the operation current; when the environment temperature is lower than the preset environment temperature, the current difference value is obtained by subtracting the product of the maximum current and the second unloading coefficient from the running current; the first unloading factor is greater than the second unloading factor.
As an optional implementation manner of the embodiment of the present invention, the method further includes:
when the running current is not greater than the preset current, acquiring the ambient temperature, the condensation temperature and the evaporation temperature; and judging whether to exit the quick starting mode or not according to the ambient temperature, the condensation temperature and the evaporation temperature, and reducing the frequency of the compressor.
In some alternative embodiments, determining whether to exit the rapid start mode based on the ambient temperature, the condensing temperature, and the evaporating temperature, and reducing the compressor frequency comprises:
when the ambient temperature is not lower than the preset ambient temperature within the continuous preset time, judging whether the difference value between the condensing temperature and the ambient temperature is greater than a third preset value; if the difference value is greater than the preset value, the quick starting mode is exited, and the frequency of the compressor is reduced according to the difference value; if not, the compressor frequency is adjusted in a fast start mode.
Wherein reducing the compressor frequency according to the difference comprises:
reducing the compressor frequency once every fourth preset time interval; each compressor frequency reduction step is a fourth preset value multiplied by the difference.
In further alternative embodiments, determining whether to exit the rapid start mode based on the ambient temperature, the condensing temperature, and the evaporating temperature, and reducing the compressor frequency comprises:
when the environmental temperature within the continuous preset time is lower than the preset environmental temperature, judging whether the evaporation temperature is lower than a fifth preset value; if the target evaporation temperature is less than the target evaporation temperature, the quick starting mode is exited, and the frequency of the compressor is reduced according to the difference value of the target evaporation temperature and the absolute value of the evaporation temperature; if not, the compressor frequency is adjusted in a fast start mode.
Wherein, the frequency of the compressor is reduced once every fifth preset time interval; each compressor frequency reduction step is a sixth preset value multiplied by the difference.
It is understood that the same types of preset parameters mentioned in the above embodiments, such as the first preset time duration and the second preset time duration, and the first preset value and the second preset value, are set according to actual situations, and may be the same or different.
To further illustrate the aspects of the present invention, a specific embodiment is provided below.
The frequency conversion natural cooling air-cooled screw type water chilling unit is provided with an ambient temperature sensor, a chilled water inlet and outlet water temperature sensor can detect chilled water inlet and outlet water temperature and ambient temperature in real time, and a main board in an electric cabinet of the unit analyzes data according to control logic, so that control commands for a compressor and an electronic expansion valve are given. The temperature To of the outlet water of the chilled water can be set, and the temperature To belongs To [ 5,20 ]. Wherein To epsilon [ 5,20 ] ℃ refers To a selectable range of the water outlet temperature. Before the unit is started, the deviation between the ambient temperature and the set value of the outlet water temperature of the chilled water is detected, and then the unit is started in the following modes.
1) Before a unit is started, when t1 epsilon [ 10,30 ] seconds are continuously detected until the environment temperature TE is more than X1 epsilon [ 15,50 ] DEG C, and the difference Tout-To between the chilled water outlet temperature Tout and the chilled water outlet temperature target value is more than 5 ℃, the unit is started, a compressor is started To operate according To the starting frequency H1 epsilon [ 50,150 ] Hz for t2 epsilon [ 20,50 ] seconds, the unit starts To enter rapid starting adjustment, the compressor adjusts the frequency once every t3 epsilon [ 3,10 ] seconds, the frequency adjustment stride is load P1 (Tout-To), and P1 epsilon [ 1,5 ]; meanwhile, the unit detects the condensation temperature Tc and the compressor running current A1 through a sensor arranged on the unit in real time, when the difference value between the condensation temperature Tc and the ambient temperature TE is larger than M epsilon to 10 and 20 ℃, the compressor starts to reduce the frequency every t4 epsilon to 2 and 8 seconds, the frequency regulation step is unloading step P2 (Tc-TE), and P2 epsilon to 2 and 8; when the compressor current is larger than the maximum running current Y1, Y1 e [ 0.8,0.95 ], preferably, Y1 takes a value of 0.85, the compressor starts to decrease frequency every t4 e [ 2,8 ] seconds, the frequency adjustment step is unloading step P2 (a1-a0 0.85), and a0 is set according to the compressor model. The compressor frequency adjustment priority is: current unload > condensing temperature unload > water temperature load.
2) Before a unit is started, when t1 epsilon [ 10,30 ] seconds are continuously detected until the environment temperature TE is more than X2 epsilon [ 0,15 ] DEG C, and the difference Tout-To between the chilled water outlet temperature Tout and the chilled water outlet temperature target value is more than 5 ℃, the unit is started, a compressor is started To operate according To the starting frequency H1 epsilon [ 50,150 ] Hz for t2 epsilon [ 20,50 ] seconds, the unit starts To enter rapid starting adjustment, the compressor adjusts the frequency once every t3 epsilon [ 3,10 ] seconds, the frequency adjustment stride is load P1 (Tout-To), and P1 epsilon [ 1,5 ]; meanwhile, the unit detects the evaporation temperature Tz and the compressor running current A1 through a sensor carried by the unit in real time, when the evaporation temperature Tz is less than N and belongs to the range of-2 and 5 ℃, the compressor starts to reduce the frequency every t4 and belongs to the range of 2 and 8 seconds, the frequency adjustment step is unloading step P2 (Tzo- | Tz |), P2 and belongs to the range of 2 and 8, and Tzo and belongs to the range of 3 and 8; when the compressor current is larger than the maximum running current A0Y 2, Y2E [ 0.65,0.9 ], the compressor starts to reduce frequency every t 4E [ 2,8 ] second, the frequency adjusting step is unloading step P2 (A1-A0Y 2), and A0 is set according to the compressor model. The compressor frequency adjustment priority is: current unload > evaporating temperature unload > Water temperature load.
According to the starting method provided by the embodiment of the invention, the effect of timely responding to the cold load of the variable-frequency natural cooling air-cooled screw type water chilling unit is realized by detecting the ambient temperature, the deviation between the chilled water outlet temperature and the set outlet water temperature and dynamically changing the frequency of the compressor.
In one embodiment, an embodiment of the present invention provides a starting apparatus for a water chilling unit, as shown in fig. 3, including:
the acquiring module 31 is configured to acquire a temperature difference between an actual outlet water temperature of the chilled water and a target outlet water temperature when the unit is started;
the judging module 32 is configured to judge whether the temperature difference is greater than a preset temperature difference;
and an adjusting module 33, configured to adjust the frequency of the compressor in the fast start mode according to the temperature difference when the temperature difference is greater than the preset temperature difference. Specifically, the adjusting module controls the compressor to operate at a starting frequency for a first preset time; and increasing the frequency of the compressor according to the temperature difference value every second preset time interval. Further, each time the compressor frequency is increased by a step of the first preset value multiplied by the temperature difference.
It should be noted that the obtaining module further obtains the compressor frequency, and when the compressor frequency reaches the full load frequency, the adjusting module exits the fast start mode.
In some optional embodiments, the obtaining module further obtains an operating current of the compressor;
and when the running current is greater than the preset current, the adjusting module exits the quick starting mode and reduces the frequency of the compressor according to the current difference value of the running current and the preset current. Wherein, reducing the compressor frequency according to the current difference between the operating current and the preset current comprises: reducing the compressor frequency once every third preset time interval; each compressor frequency reduction step is a second preset value multiplied by the current difference.
It should be noted that the obtaining module further obtains an ambient temperature, and when the ambient temperature is not lower than the preset ambient temperature, the current difference is a value obtained by subtracting a product of the maximum current and the first unloading coefficient from the operating current; when the environment temperature is lower than the preset environment temperature, the current difference value is obtained by subtracting the product of the maximum current and the second unloading coefficient from the running current; the first unloading factor is greater than the second unloading factor.
As an optional implementation manner of the embodiment of the present invention, when the operating current is not greater than the preset current, the obtaining module obtains the ambient temperature, the condensing temperature, and the evaporating temperature;
and judging whether the adjusting module exits the quick start mode or not according to the ambient temperature, the condensation temperature and the evaporation temperature, and reducing the frequency of the compressor.
In an optional embodiment, when the ambient temperature within the continuous preset time is not lower than the preset ambient temperature, the judgment module judges whether the difference between the condensing temperature and the ambient temperature is greater than a third preset value; if the difference value is greater than the preset value, the adjusting module exits the quick starting mode and reduces the frequency of the compressor according to the difference value; if not, the adjustment module adjusts the compressor frequency in a fast start mode. Wherein reducing the compressor frequency according to the difference comprises: reducing the compressor frequency once every fourth preset time interval; each compressor frequency reduction step is a fourth preset value multiplied by the difference.
In another optional embodiment, when the ambient temperature within the continuous preset time is lower than the preset ambient temperature, the determining module determines whether the evaporation temperature is lower than a fifth preset value; if the target evaporation temperature is less than the target evaporation temperature, the adjusting module exits the quick starting mode and reduces the frequency of the compressor according to the difference value of the target evaporation temperature and the absolute value of the evaporation temperature; if not, the adjustment module adjusts the compressor frequency in a fast start mode. Wherein reducing the compressor frequency according to the difference between the target evaporating temperature and the absolute value of the evaporating temperature comprises: reducing the frequency of the compressor once every fifth preset time interval; each compressor frequency reduction step is a sixth preset value multiplied by the difference.
According to the starting device of the water chilling unit, provided by the embodiment of the invention, the acquisition module acquires the temperature difference value between the actual outlet water temperature and the target outlet water temperature of chilled water when the unit is started, and the acquisition module also acquires the ambient temperature, the condensation temperature, the evaporation temperature and the running current; the judging module judges whether the temperature difference is larger than a preset temperature difference or not; when the temperature difference is larger than the preset temperature difference, the adjusting module adjusts the frequency of the compressor in a quick starting mode according to the temperature difference. Meanwhile, the judgment module judges the relation between the environment temperature, the condensation temperature, the evaporation temperature and the running current and a preset value, and the adjustment module adjusts the frequency of the compressor according to the judgment result. The problem that the load is small after a conventional air-cooled screw type water chilling unit is started and the response to the load at the tail end is slow is solved, and the cold load is responded in time.
In an embodiment, an embodiment of the present invention further provides a water chilling unit, including the apparatus provided in the above embodiment. The natural cooling air-cooled water chiller has the characteristics of large heat productivity, large power density and high heat density, and needs a water chiller to have quick response capability to the load of the refrigeration system, and particularly needs to quickly reach full load to supply cold to a data center machine room when quick cold supply is needed in an emergency. According to the embodiment of the invention, the load of the unit is loaded to full load by detecting the temperature difference between the outlet water temperature of the chilled water and the target value and by quickly starting, so that the problems of small load and slow response to the load at the tail end of the conventional air-cooled screw type water chilling unit after starting are solved.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.
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 specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations 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 application.
It should be understood that portions of the present application 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. For example, 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 application 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.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means 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 application. In this specification, the schematic representations of the terms used above do not necessarily 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.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (15)
1. A starting method of a water chilling unit is characterized by comprising the following steps:
acquiring a temperature difference value between an actual outlet water temperature and a target outlet water temperature of chilled water when a unit is started;
judging whether the temperature difference is larger than a preset temperature difference or not;
and when the temperature difference is larger than the preset temperature difference, adjusting the frequency of the compressor in a quick start mode according to the temperature difference.
2. The method of claim 1, wherein: said adjusting the compressor frequency in a fast start mode based on said temperature difference comprises:
controlling the compressor to run at a starting frequency for a first preset duration;
and increasing the frequency of the compressor according to the temperature difference value every a second preset interval.
3. The method of claim 2, wherein: and when the compressor frequency is increased according to the temperature difference value every second preset time interval, the step of increasing the compressor frequency every time is the first preset value multiplied by the temperature difference value.
4. The method of claim 1, further comprising:
detecting the compressor frequency;
exiting the rapid start mode when the compressor frequency reaches a full load frequency.
5. The method of claim 1, further comprising:
detecting an operating current of the compressor;
and when the running current is larger than the preset current, the quick starting mode is exited, and the frequency of the compressor is reduced according to the current difference value of the running current and the preset current.
6. The method of claim 5, wherein: the reducing the compressor frequency according to the current difference between the operating current and the preset current comprises:
decreasing the compressor frequency once every third predetermined period of time; each compressor frequency reduction step is multiplied by the current difference by a second preset value.
7. The method of claim 5, further comprising:
when the environment temperature is not lower than the preset environment temperature, the current difference value is obtained by subtracting the product of the maximum current and the first unloading coefficient from the running current;
when the environment temperature is lower than the preset environment temperature, the current difference value is obtained by subtracting the product of the maximum current and a second unloading coefficient from the running current;
the first unloading factor is greater than the second unloading factor.
8. The method of claim 5, further comprising:
when the operating current is not greater than a preset current, acquiring an ambient temperature, a condensing temperature and an evaporating temperature;
and judging whether to exit the quick starting mode or not according to the environment temperature, the condensation temperature and the evaporation temperature, and reducing the frequency of the compressor.
9. The method of claim 8, wherein: the judging whether to exit the quick start mode or not according to the environment temperature, the condensation temperature and the evaporation temperature, and reducing the frequency of the compressor comprises:
when the ambient temperature is not lower than a preset ambient temperature within a continuous preset time, judging whether the difference value between the condensing temperature and the ambient temperature is greater than a third preset value;
if the difference value is greater than the preset value, the quick starting mode is exited, and the frequency of the compressor is reduced according to the difference value; if not, the compressor frequency is adjusted in a fast start mode.
10. The method of claim 9, wherein: said reducing the compressor frequency according to the difference comprises:
decreasing the compressor frequency once every fourth preset interval; each compressor frequency reduction step is a fourth preset value multiplied by the difference.
11. The method of claim 8, wherein: the judging whether to exit the quick start mode or not according to the environment temperature, the condensation temperature and the evaporation temperature, and reducing the frequency of the compressor comprises:
when the environment temperature is lower than the preset environment temperature within the continuous preset time, judging whether the evaporation temperature is lower than a fifth preset value or not;
if the target evaporation temperature is less than the target evaporation temperature, the quick starting mode is exited, and the frequency of the compressor is reduced according to the difference value of the target evaporation temperature and the absolute value of the evaporation temperature; if not, the compressor frequency is adjusted in a fast start mode.
12. The method of claim 11, wherein: the reducing the compressor frequency according to the difference between the target evaporating temperature and the absolute value of the evaporating temperature comprises:
decreasing the compressor frequency once every fifth preset interval; each compressor frequency reduction step is a sixth preset value multiplied by the difference.
13. The method according to any one of claims 1-12, wherein: the water chilling unit is a variable-frequency natural cooling air-cooled screw type water chilling unit.
14. A chiller starting device, comprising:
the acquisition module is used for acquiring the temperature difference between the actual outlet water temperature and the target outlet water temperature of the chilled water when the unit is started;
the judging module is used for judging whether the temperature difference value is larger than a preset temperature difference value or not;
and the adjusting module is used for adjusting the frequency of the compressor in a quick starting mode according to the temperature difference when the temperature difference is larger than the preset temperature difference.
15. A water chilling unit is characterized in that: comprising the apparatus of claim 14.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011420546.4A CN112665239B (en) | 2020-12-08 | 2020-12-08 | Water chilling unit starting method and device and water chilling unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011420546.4A CN112665239B (en) | 2020-12-08 | 2020-12-08 | Water chilling unit starting method and device and water chilling unit |
Publications (2)
| Publication Number | Publication Date |
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| CN112665239A true CN112665239A (en) | 2021-04-16 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113883045A (en) * | 2021-11-22 | 2022-01-04 | 国能四川天明发电有限公司 | Method and device for controlling frequency of water taking pump |
| CN115451596A (en) * | 2022-08-31 | 2022-12-09 | 克莱门特捷联制冷设备(上海)有限公司 | Energy control method for quickly and stably starting centrifugal water chilling unit |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005016870A (en) * | 2003-06-27 | 2005-01-20 | Matsushita Electric Ind Co Ltd | Refrigerator |
| CN102494445A (en) * | 2011-12-12 | 2012-06-13 | 龚文浩 | Start method for quickly discharging pressure of compressor of refrigeration system |
| CN102967022A (en) * | 2012-10-23 | 2013-03-13 | 宁波奥克斯电气有限公司 | Control method for starting variable-frequency compressor of multi-connected air conditioning unit |
| 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 |
| CN206160371U (en) * | 2016-08-31 | 2017-05-10 | 四川富士鑫电梯有限公司 | Elevator machine room environmental protection ventilation system |
| CN111649442A (en) * | 2020-06-15 | 2020-09-11 | 宁波奥克斯电气股份有限公司 | Air conditioner control method and device, air conditioner and storage medium |
-
2020
- 2020-12-08 CN CN202011420546.4A patent/CN112665239B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005016870A (en) * | 2003-06-27 | 2005-01-20 | Matsushita Electric Ind Co Ltd | Refrigerator |
| CN102494445A (en) * | 2011-12-12 | 2012-06-13 | 龚文浩 | Start method for quickly discharging pressure of compressor of refrigeration system |
| CN102967022A (en) * | 2012-10-23 | 2013-03-13 | 宁波奥克斯电气有限公司 | Control method for starting variable-frequency compressor of multi-connected air conditioning unit |
| 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 |
| CN206160371U (en) * | 2016-08-31 | 2017-05-10 | 四川富士鑫电梯有限公司 | Elevator machine room environmental protection ventilation system |
| CN111649442A (en) * | 2020-06-15 | 2020-09-11 | 宁波奥克斯电气股份有限公司 | Air conditioner control method and device, air conditioner and storage medium |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113883045A (en) * | 2021-11-22 | 2022-01-04 | 国能四川天明发电有限公司 | Method and device for controlling frequency of water taking pump |
| CN113883045B (en) * | 2021-11-22 | 2024-06-04 | 国能四川天明发电有限公司 | Water taking pump frequency control method and device |
| CN115451596A (en) * | 2022-08-31 | 2022-12-09 | 克莱门特捷联制冷设备(上海)有限公司 | Energy control method for quickly and stably starting centrifugal water chilling unit |
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