CN112665153A - Control method and device for cooling capacity of refrigerating system, controller and refrigerating system - Google Patents
Control method and device for cooling capacity of refrigerating system, controller and refrigerating system Download PDFInfo
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- CN112665153A CN112665153A CN202011552370.8A CN202011552370A CN112665153A CN 112665153 A CN112665153 A CN 112665153A CN 202011552370 A CN202011552370 A CN 202011552370A CN 112665153 A CN112665153 A CN 112665153A
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Abstract
The invention relates to a method and a device for controlling the cooling capacity of a refrigerating system, a controller and the refrigerating system, wherein the method for controlling the cooling capacity of the refrigerating system comprises the following steps: acquiring the total cooling capacity of the refrigerating system; determining the target cooling capacity of each refrigerating host in the refrigerating system; determining the flow value of each refrigeration host according to the target cooling capacity of the refrigeration host; according to the flow value of the refrigeration host, the frequency of the water pump corresponding to the refrigeration host is adjusted, so that the actual cooling capacity of the refrigeration host reaches the target cooling capacity.
Description
Technical Field
The invention relates to the technical field of air conditioner refrigeration, in particular to a method and a device for controlling the amount of cooling capacity of a refrigeration system, a controller and the refrigeration system.
Background
When the air conditioning system carries out refrigeration, the traditional technical scheme is that under the current cooling water inlet temperature, the freezing water outlet temperature and the pressure ratio of the host, cold machine combination performance curves with different load rates under the same pressure ratio are drawn to determine that under the current load rate, a plurality of hosts are started to share the cold quantity requirement together, the unit energy efficiency can reach the highest, the traditional technical scheme is only suitable for the condition that a plurality of hosts with the same cold quantity are started simultaneously, and when the refrigeration system has large and small host collocation and different host types, the average cold quantity sharing cannot reach the highest energy efficiency.
Disclosure of Invention
In view of the above, the present invention provides a method, an apparatus, a controller and a refrigeration system for controlling cooling capacity of a refrigeration system to overcome the deficiencies of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme: a method of controlling cooling capacity of a refrigeration system, comprising:
acquiring the total cooling capacity of the refrigerating system;
determining the target cooling capacity of each refrigerating host in the refrigerating system;
determining the flow value of each refrigeration host according to the target cooling capacity of the refrigeration host;
and adjusting the frequency of a water pump corresponding to the refrigeration host according to the flow value of the refrigeration host so as to enable the actual cooling capacity of the refrigeration host to reach the target cooling capacity.
Optionally, the obtaining the total cooling capacity of the refrigeration system includes:
reading the water temperature of a cold water return main pipe, the water temperature of a cold water supply main pipe and the water flow of the cold water return main pipe or a water supply pipe; calculating the total cooling capacity of the refrigeration system according to the water temperature of the cold water return main pipe, the water temperature of the cold water supply main pipe and the water flow of the cold water return main pipe or the water supply pipe; alternatively, the first and second electrodes may be,
and directly reading a heat value through a heat meter, and taking the heat value as the total cooling capacity of the refrigeration system.
Optionally, the determining the target cooling capacity of each refrigeration host in the refrigeration system includes:
determining a host cold quantity distribution proportion combination set;
calculating the average energy efficiency ratio of each combination mode in the cold distribution proportion combination set;
and determining the target cooling capacity of each refrigerating host in the refrigerating system according to the total cooling capacity and the host cooling capacity distribution proportion corresponding to the combination mode with the highest average energy efficiency ratio.
Optionally, the calculating an average energy efficiency ratio in each combination mode in the cold distribution ratio combination set includes:
determining the energy efficiency ratio of each refrigeration host;
under each combination mode, respectively calculating the product of the energy efficiency ratio of each refrigerating host and the cold quantity distribution proportion of the refrigerating host;
and adding and summing the products of the energy efficiency ratio of each refrigerating host and the cold distribution proportion of the refrigerating host in the same combination mode, averaging, and taking the average as the average energy efficiency ratio in the combination mode.
Optionally, the determining the flow value of each refrigeration host according to the target cooling capacity of each refrigeration host includes:
determining the cold capacity ratio of each refrigerating host according to the target cold supply capacity of each refrigerating host;
and taking the product of the cold capacity ratio of the refrigeration host and the total flow as the flow value of the refrigeration host.
Optionally, the refrigeration system comprises:
a plurality of refrigeration hosts with different types and/or sizes.
The invention also provides a control device for the cooling capacity of the refrigerating system, which comprises:
the acquisition module is used for acquiring the total cooling capacity of the refrigeration system;
the first determining module is used for determining the target cooling capacity of each refrigerating host in the refrigerating system;
the second determining module is used for determining the flow value of each refrigerating host according to the target cooling capacity of the refrigerating host;
and the frequency adjusting module is used for adjusting the frequency of the water pump corresponding to the refrigeration host according to the flow value of the refrigeration host so as to enable the actual cooling capacity of the refrigeration host to reach the target cooling capacity.
The invention also provides a controller for executing the control method of the cooling capacity of the refrigeration system.
The present invention also provides a refrigeration system comprising:
a control device as described above, and,
a plurality of refrigeration hosts with different types and/or sizes.
Optionally, the refrigeration host includes:
a centrifugal cold water main machine and a screw cold water main machine.
By adopting the technical scheme, the method for controlling the cooling capacity of the refrigerating system comprises the following steps: acquiring the total cooling capacity of the refrigerating system; determining the target cooling capacity of each refrigerating host in the refrigerating system; determining the flow value of each refrigeration host according to the target cooling capacity of the refrigeration host; according to the flow value of the refrigeration host, the frequency of the water pump corresponding to the refrigeration host is adjusted, so that the actual cooling capacity of the refrigeration host reaches the target cooling capacity.
Drawings
In order to more clearly illustrate the embodiments of the present invention 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 invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart provided by an embodiment of a method for controlling cooling capacity of a refrigeration system according to the present invention;
fig. 2 is a schematic flow chart of a method for controlling cooling capacity of a refrigeration system according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram provided by an embodiment of the device for controlling cooling capacity of the refrigeration system of the present invention.
In the figure: 1. an acquisition module; 2. a first determination module; 3. a second determination module; 4. and a frequency adjustment module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Fig. 1 is a schematic flow chart of a method for controlling cooling capacity of a refrigeration system according to an embodiment of the present invention.
As shown in fig. 1, a method for controlling cooling capacity of a refrigeration system according to this embodiment includes:
s11: acquiring the total cooling capacity of the refrigerating system;
further, the obtaining of the total cooling capacity of the refrigeration system includes:
reading the water temperature of a cold water return main pipe, the water temperature of a cold water supply main pipe and the water flow of the cold water return main pipe or a water supply pipe; calculating the total cooling capacity of the refrigeration system according to the water temperature of the cold water return main pipe, the water temperature of the cold water supply main pipe and the water flow of the cold water return main pipe or the water supply pipe; alternatively, the first and second electrodes may be,
and directly reading a heat value through a heat meter, and taking the heat value as the total cooling capacity of the refrigeration system.
S12: determining the target cooling capacity of each refrigerating host in the refrigerating system;
s13: determining the flow value of each refrigeration host according to the target cooling capacity of the refrigeration host;
further, the determining the flow value of each refrigeration host according to the target cooling capacity of the refrigeration host comprises:
determining the cold capacity ratio of each refrigerating host according to the target cold supply capacity of each refrigerating host;
and taking the product of the cold capacity ratio of the refrigeration host and the total flow as the flow value of the refrigeration host.
S14: and adjusting the frequency of a water pump corresponding to the refrigeration host according to the flow value of the refrigeration host so as to enable the actual cooling capacity of the refrigeration host to reach the target cooling capacity.
In practical use, in this embodiment, a refrigeration system is assumed to include a centrifugal chiller and a screw chiller, and it is assumed that the cooling capacity ratio of the centrifugal chiller is determined to be 66.6% and the cooling capacity ratio of the screw chiller is determined to be 33.3%; the flow adjustment of the water pumps corresponding to the centrifugal cold water main machine and the screw cold water main machine is realized by correspondingly adjusting the frequency of the water pumps, so that the evaporators of the centrifugal cold water main machine and the screw cold water main machine can be controlled according to the outlet water temperature to obtain different heat exchange amounts.
According to the control method, the cold quantity of a single refrigeration host is passively controlled by adjusting the frequency of the water pumps corresponding to different refrigeration hosts according to the principle that the energy efficiency of the refrigerating machine is optimal, so that the refrigeration system can accurately control the cold quantity output collocation of different refrigeration hosts, and the overall energy efficiency of the refrigeration system is the highest.
Fig. 2 is a schematic flow chart of a method for controlling cooling capacity of a refrigeration system according to a second embodiment of the present invention.
As shown in fig. 2, the method for controlling cooling capacity of a refrigeration system according to this embodiment includes:
s21: acquiring the total cooling capacity of the refrigerating system;
s22: determining a host cold quantity distribution proportion combination set;
s23: calculating the average energy efficiency ratio of each combination mode in the cold distribution proportion combination set;
further, the calculating the average energy efficiency ratio in each combination mode in the cold distribution ratio combination set includes:
determining the energy efficiency ratio of each refrigeration host;
under each combination mode, respectively calculating the product of the energy efficiency ratio of each refrigerating host and the cold quantity distribution proportion of the refrigerating host;
and adding and summing the products of the energy efficiency ratio of each refrigerating host and the cold distribution proportion of the refrigerating host in the same combination mode, averaging, and taking the average as the average energy efficiency ratio in the combination mode.
S24: determining the target cooling capacity of each refrigerating host in the refrigerating system according to the total cooling capacity and the host cooling capacity distribution proportion corresponding to the combination mode with the highest average energy efficiency ratio;
s25: determining the flow value of each refrigeration host according to the target cooling capacity of the refrigeration host;
further, the determining the flow value of each refrigeration host according to the target cooling capacity of the refrigeration host comprises:
determining the cold capacity ratio of each refrigerating host according to the target cold supply capacity of each refrigerating host;
and taking the product of the cold capacity ratio of the refrigeration host and the total flow as the flow value of the refrigeration host.
S26: and adjusting the frequency of a water pump corresponding to the refrigeration host according to the flow value of the refrigeration host so as to enable the actual cooling capacity of the refrigeration host to reach the target cooling capacity.
Further, the refrigeration system includes:
a plurality of refrigeration hosts with different types and/or sizes.
In practical use of this embodiment, if the total cooling capacity required for the actual operation of the refrigeration system is 360RT, the refrigeration system is composed of 1 300RT centrifuge and 1 300RT screw machine, the cold distributions of the centrifuge and the screw machine are respectively based on, for example, 10% and 90%, 20% and 80%, 30% and 70%, 40% and 60%, 50% and 50%, 60% and 40%, 70% and 30%, 80% and 20%, and 90% and 10%, and the distribution ratios are not limited to the above manners, but may be enumerated with more combinations, so as to obtain the energy efficiency ratio COP of the centrifuge and the energy efficiency ratio COP of the screw machine, respectively (the energy efficiency ratios are given based on parameters such as load ratio, cooling water inlet/outlet temperature, and chilled water inlet/outlet temperature, and energy efficiency ratio COP given by the test of the apparatus itself); calculating average energy efficiency ratios (average energy efficiency ratio is centrifuge COP (coefficient of performance) cold quantity ratio of the centrifuge and COP (coefficient of performance) cold quantity ratio of the screw machine), such as 66.6% of cold quantity of the centrifuge and 33.3% of cold quantity of the screw machine, namely 240RT (load rate 80%, cold quantity ratio of the system 66.6%) of cold quantity output of the centrifuge, and the COP is 6.541 in different combination modes; the cold output of the screw machine is 120RT (the load factor is 40%, the cold accounts for 33.3% of the system ratio), the COP is 6.461, and the average COP of the refrigeration system is 6.510. Selecting the combination with the highest average COP and acquiring the cold capacity ratio thereof, thereby distributing the flow capacity ratio thereof, namely the flow capacity value of each refrigeration host, such as: the cold energy proportion of the centrifugal machine is 66.6%, the cold energy proportion of the screw machine is 33.3%, namely the supply return water flow of the water pump corresponding to the centrifugal machine is set to be 66.6% of the total flow, the supply return water flow of the screw machine is set to be 33.3% of the total flow, the frequency of the water pump is correspondingly adjusted, and the flow adjustment of the water pump corresponding to the centrifugal machine and the water pump corresponding to the screw machine is realized, so that the evaporators of the centrifugal machine and the screw machine can be controlled according to the outlet water temperature to obtain different heat exchange amounts.
Taking a 300RT centrifugal machine and a 300RT screw machine which are configured as a refrigerating system, taking the example that the total cooling capacity required by actual operation is 360RT, the inlet temperature of cooling water is 29.44 ℃, the outlet temperature of chilled water is 7 ℃, the traditional distribution mode is to start two main machines, the cooling capacity of each machine is 180RT (split cooling capacity), the load rate of the machine set is 60%, the COP of the centrifugal machine is 6.091, the COP of the screw machine is 6.559, and the average COP of the refrigerating system is 6.325; by using the method described in the embodiment, the refrigeration output of the centrifugal machine is 240RT (load rate 80%), the COP is 6.541, the refrigeration output of the screw machine is 120RT (load rate 40%), and the COP is 6.461, at this time, the average COP of the refrigeration system is 6.510, and compared with the traditional flat refrigeration mode, the energy efficiency is improved by 2.9%.
In the present embodiment, the load factor refers to: the ratio of the actual cooling capacity of the refrigeration host to the rated cooling capacity of the refrigeration host.
According to the control method, the water inflow of the refrigeration hosts is controlled by adjusting the frequency of the water pumps corresponding to the different refrigeration hosts according to the principle that the energy efficiency of the refrigerating machine is optimal, the cold quantity of the single refrigeration host is passively controlled, the refrigeration system can accurately control the cold quantity output collocation of the different refrigeration hosts, and the overall energy efficiency of the refrigeration system is the highest.
Fig. 3 is a schematic structural diagram provided by an embodiment of the device for controlling cooling capacity of the refrigeration system of the present invention.
As shown in fig. 3, the device for controlling cooling capacity of a refrigeration system according to this embodiment includes:
the acquisition module 1 is used for acquiring the total cooling capacity of the refrigeration system;
the first determining module 2 is used for determining the target cooling capacity of each refrigerating host in the refrigerating system;
the second determining module 3 is used for determining the flow value of each refrigerating host according to the target cooling capacity of the refrigerating host;
and the frequency adjusting module 4 is used for adjusting the frequency of the water pump corresponding to the refrigeration host according to the flow value of the refrigeration host so as to enable the actual cooling capacity of the refrigeration host to reach the target cooling capacity.
The working principle of the control device for cooling capacity of a refrigeration system in this embodiment is the same as that of the control method for cooling capacity of a refrigeration system in any of the above embodiments, and details are not repeated here.
According to the control device for the cooling capacity of the refrigerating system, the passive control of the cooling capacity of a single refrigerating host is realized by adjusting the frequency of the water pumps corresponding to different refrigerating hosts according to the principle that the energy efficiency of a refrigerating machine is optimal, so that the refrigerating system can accurately control the cooling capacity output collocation of different refrigerating hosts, and the overall energy efficiency of the refrigerating system is the highest.
The invention also provides a controller for executing the control method of the cooling capacity of the refrigeration system in the figure 1 or the figure 2.
The present invention also provides a refrigeration system comprising:
the control device as described in fig. 3, and,
a plurality of refrigeration hosts with different types and/or sizes.
Further, the refrigeration host comprises:
a centrifugal cold water main machine and a screw cold water main machine.
Specifically, the centrifugal cold water main unit includes: the centrifugal type centrifugal compressor comprises a centrifugal compressor, an evaporator and a condenser, wherein the evaporator is connected with a centrifuge cold water pump, and the condenser is connected with a centrifuge cooling water pump. The screw type cold water main machine comprises: the screw compressor, the evaporator and the condenser are connected, the evaporator is connected with a cold water pump of the screw machine, and the condenser is connected with the cooling water pump of the screw machine. The structures of the centrifugal cold water main machine and the screw cold water main machine are the prior art, and are not described in detail herein.
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 the terms "first," "second," and the like in the description of the present invention 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 invention, 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 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.
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. 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 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.
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 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 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 (10)
1. A method of controlling cooling capacity of a refrigeration system, comprising:
acquiring the total cooling capacity of the refrigerating system;
determining the target cooling capacity of each refrigerating host in the refrigerating system;
determining the flow value of each refrigeration host according to the target cooling capacity of the refrigeration host;
and adjusting the frequency of a water pump corresponding to the refrigeration host according to the flow value of the refrigeration host so as to enable the actual cooling capacity of the refrigeration host to reach the target cooling capacity.
2. The control method as set forth in claim 1, wherein said obtaining a total cooling capacity of the refrigeration system comprises:
reading the water temperature of a cold water return main pipe, the water temperature of a cold water supply main pipe and the water flow of the cold water return main pipe or a water supply pipe; calculating the total cooling capacity of the refrigeration system according to the water temperature of the cold water return main pipe, the water temperature of the cold water supply main pipe and the water flow of the cold water return main pipe or the water supply pipe; alternatively, the first and second electrodes may be,
and directly reading a heat value through a heat meter, and taking the heat value as the total cooling capacity of the refrigeration system.
3. The method of claim 1, wherein the determining a target cooling capacity for each refrigeration host in the refrigeration system comprises:
determining a host cold quantity distribution proportion combination set;
calculating the average energy efficiency ratio of each combination mode in the cold distribution proportion combination set;
and determining the target cooling capacity of each refrigerating host in the refrigerating system according to the total cooling capacity and the host cooling capacity distribution proportion corresponding to the combination mode with the highest average energy efficiency ratio.
4. The control method according to claim 3, wherein the calculating of the average energy efficiency ratio in each combination of the cold distribution ratio combinations includes:
determining the energy efficiency ratio of each refrigeration host;
under each combination mode, respectively calculating the product of the energy efficiency ratio of each refrigerating host and the cold quantity distribution proportion of the refrigerating host;
and adding and summing the products of the energy efficiency ratio of each refrigerating host and the cold distribution proportion of the refrigerating host in the same combination mode, averaging, and taking the average as the average energy efficiency ratio in the combination mode.
5. The control method according to claim 1, wherein the determining the flow value of each refrigeration host according to the target cooling capacity of the refrigeration host comprises:
determining the cold capacity ratio of each refrigerating host according to the target cold supply capacity of each refrigerating host;
and taking the product of the cold capacity ratio of the refrigeration host and the total flow as the flow value of the refrigeration host.
6. The control method according to any one of claims 1 to 5, wherein the refrigeration system includes:
a plurality of refrigeration hosts with different types and/or sizes.
7. A control apparatus for cooling capacity of a refrigeration system, comprising:
the acquisition module is used for acquiring the total cooling capacity of the refrigeration system;
the first determining module is used for determining the target cooling capacity of each refrigerating host in the refrigerating system;
the second determining module is used for determining the flow value of each refrigerating host according to the target cooling capacity of the refrigerating host;
and the frequency adjusting module is used for adjusting the frequency of the water pump corresponding to the refrigeration host according to the flow value of the refrigeration host so as to enable the actual cooling capacity of the refrigeration host to reach the target cooling capacity.
8. A controller for performing the method of controlling cooling capacity of the refrigeration system according to any one of claims 1 to 6.
9. A refrigeration system, comprising:
the control device of claim 7, and,
a plurality of refrigeration hosts with different types and/or sizes.
10. The refrigeration system as recited in claim 9 wherein said refrigeration host comprises:
a centrifugal cold water main machine and a screw cold water main machine.
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Application publication date: 20210416 |