CN111089434A - Refrigerating system, refrigerating method and air conditioning unit - Google Patents
Refrigerating system, refrigerating method and air conditioning unit Download PDFInfo
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- CN111089434A CN111089434A CN201911310051.3A CN201911310051A CN111089434A CN 111089434 A CN111089434 A CN 111089434A CN 201911310051 A CN201911310051 A CN 201911310051A CN 111089434 A CN111089434 A CN 111089434A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
Abstract
The invention relates to a refrigeration system, a refrigeration method and an air conditioning unit, wherein the system comprises: the refrigeration system comprises a plurality of stages of mutually independent refrigeration subsystems, wherein a first-stage refrigeration subsystem comprises a first evaporator and a second evaporator which are connected in parallel; the detection module is used for detecting the air inlet temperature of the first-stage refrigeration subsystem; and the controller is used for controlling the working state of each stage of refrigeration subsystem according to the air inlet temperature so as to enable the refrigeration system to maintain low air outlet temperature and low evaporation temperature in a high-temperature environment. According to the technical scheme provided by the invention, the evaporator of the first-stage refrigeration subsystem is set as the first evaporator and the second evaporator which are connected in parallel, the air inlet temperature of the first-stage refrigeration subsystem is detected, and the working state of each stage of refrigeration subsystem is controlled according to the air inlet temperature, so that the refrigeration system maintains low air outlet temperature and low evaporation temperature in a high-temperature environment, the reliability is met, the energy efficiency of an air conditioning unit is improved, and energy-saving and efficient operation is realized.
Description
Technical Field
The invention relates to the technical field of air conditioning units, in particular to a refrigerating system, a refrigerating method and an air conditioning unit.
Background
With the continuous improvement of the living standard of people, people pursue the comfort of the air conditioner more and more, and the brand new fan set is applied to the air conditioning engineering more and more. For high-temperature and hot areas such as the middle east, the air inlet enthalpy value is high, the refrigeration load is large, and the single-stage evaporation cannot meet the requirement of large enthalpy difference refrigeration, so that multi-stage evaporation is often adopted. However, in the multi-stage evaporation, the air inlet enthalpy value of the first-stage evaporator is too high, the evaporation temperature is high, and the reliability of the compressor is reduced; when the temperature of the inlet air is low, the phenomena of freezing and low-pressure retention are easy to occur.
Disclosure of Invention
In view of the above, the present invention provides a refrigeration system, a refrigeration method and an air conditioning unit, so as to solve the problems of over-high evaporation temperature and low reliability of a compressor in a multi-stage evaporation system in the prior art.
According to a first aspect of embodiments of the present invention, there is provided a refrigeration system comprising:
the refrigeration system comprises a plurality of stages of mutually independent refrigeration subsystems, wherein a first-stage refrigeration subsystem comprises a first evaporator and a second evaporator which are connected in parallel;
the detection module is used for detecting the air inlet temperature of the first-stage refrigeration subsystem;
and the controller is used for controlling the working state of each stage of refrigeration subsystem according to the air inlet temperature so as to enable the refrigeration system to maintain low air outlet temperature and low evaporation temperature in a high-temperature environment.
Preferably, the system further comprises:
the first electronic expansion valve is used for adjusting the refrigerant flow of the first evaporator;
the second electronic expansion valve is used for adjusting the refrigerant flow of the second evaporator;
the first electronic expansion valve and the second electronic expansion valve are respectively connected with the controller.
According to a second aspect of the embodiments of the present invention, there is provided a refrigeration method of a refrigeration system, including:
detecting the inlet air temperature of the first-stage refrigeration subsystem;
and controlling the working states of all stages of refrigeration subsystems according to the air inlet temperature so that the refrigeration systems maintain low air outlet temperature and low evaporation temperature in a high-temperature environment.
Preferably, the method further comprises:
detecting the running state of each stage of refrigeration subsystem;
the control of the working state of each stage of refrigeration subsystem comprises the following steps:
if the inlet air temperature is between a first temperature and a second temperature, controlling the refrigeration system to keep a current operation state; and/or the presence of a gas in the gas,
and if the inlet air temperature is not between the first temperature and the second temperature, controlling the working state of each stage of refrigeration subsystem according to the running state.
Preferably, the controlling the working state of each stage of the refrigeration subsystem comprises:
and controlling the refrigerant flow of the first evaporator and the second evaporator, and/or controlling the start and stop of other refrigeration subsystems at each stage.
Preferably, if the refrigeration system includes a first electronic expansion valve and a second electronic expansion valve respectively used for adjusting refrigerant flow rates of a first evaporator and a second evaporator, the controlling the refrigerant flow rates of the first evaporator and the second evaporator includes:
if the inlet air temperature is higher than the second temperature, detecting the evaporation pressure of the first evaporator, and if the evaporation pressure of the first evaporator is higher than a first preset pressure value, reducing the opening degree of the first electronic expansion valve and increasing the opening degree of the second electronic expansion valve;
if the inlet air temperature is lower than the first temperature, the evaporation pressure of the second evaporator and the outlet air temperature of the second evaporator are detected, if the evaporation pressure of the second evaporator is lower than a second preset pressure value and the outlet air temperature of the second evaporator is lower than a preset outlet air temperature value, the opening degree of the first electronic expansion valve is increased, and the opening degree of the second electronic expansion valve is decreased.
Preferably, the controlling the start and stop of the other stages of refrigeration subsystems comprises:
if the inlet air temperature is lower than the first temperature, detecting the evaporation pressure, the liquid pipe temperature and the outlet air temperature of the evaporators of other stages of refrigeration subsystems;
and if the evaporation pressure of the evaporator in any stage of other refrigeration subsystem is less than the respective preset pressure value, the temperature of the liquid pipe is less than the respective preset liquid pipe temperature value, and the air outlet temperature is less than the preset air outlet temperature value, the compressor of the stage of refrigeration subsystem is turned off.
Preferably, the opening degree of the first electronic expansion valve is decreased, and the opening degree of the second electronic expansion valve is increased, specifically:
and adjusting the opening degree of the first electronic expansion valve to be smaller according to a first preset amplitude and adjusting the opening degree of the second electronic expansion valve to be larger according to a second preset amplitude every other first preset time till the inlet air temperature is between the first temperature and the second temperature.
Preferably, the increasing the opening degree of the first electronic expansion valve and the decreasing the opening degree of the second electronic expansion valve specifically include:
and every second preset time interval, the opening degree of the first electronic expansion valve is increased according to a third preset amplitude, and the opening degree of the second electronic expansion valve is decreased according to a fourth preset amplitude until the inlet air temperature is between the first temperature and the second temperature.
According to a third aspect of embodiments of the present invention, there is provided an air conditioning unit comprising:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to:
detecting the inlet air temperature of the first-stage refrigeration subsystem;
and controlling the working states of all stages of refrigeration subsystems according to the air inlet temperature so that the refrigeration systems maintain low air outlet temperature and low evaporation temperature in a high-temperature environment.
The technical scheme provided by the embodiment of the invention can have the following beneficial effects:
the evaporator of the first-stage refrigeration subsystem is set to be the first evaporator and the second evaporator which are connected in parallel, the air inlet temperature of the first-stage refrigeration subsystem is detected, and the working state of each stage of refrigeration subsystem is controlled according to the air inlet temperature, so that the refrigeration system maintains low air outlet temperature and low evaporation temperature in a high-temperature environment, the reliability is met, the energy efficiency of an air conditioning unit is improved, and energy-saving and efficient operation is realized.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic diagram of a refrigeration system according to an exemplary embodiment;
FIG. 2 is a flow chart illustrating a method of controlling a refrigeration system according to an exemplary embodiment;
FIG. 3 is a flow chart illustrating a method of controlling a refrigeration system according to another exemplary embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
FIG. 1 is a schematic diagram illustrating a refrigeration system according to an exemplary embodiment, as shown in FIG. 1, including:
a plurality of stages of mutually independent refrigeration subsystems, wherein the first stage refrigeration subsystem comprises a first evaporator E1 and a second evaporator E2 which are connected in parallel;
a detection module (not shown in the drawings) for detecting the temperature of the inlet air of the first stage refrigeration subsystem;
and the controller (not shown in the attached drawings) is used for controlling the working states of all stages of refrigeration subsystems according to the inlet air temperature so as to enable the refrigeration systems to maintain low outlet air temperature and low evaporation temperature in a high-temperature environment.
It should be noted that the technical solution provided in this embodiment is applicable to an air conditioning unit.
It should be noted that the controller includes but is not limited to: singlechip, microprocessor, PLC controller, DSP controller, FPGA controller etc..
The multi-stage mutually independent refrigeration subsystems at least comprise two stages of mutually independent refrigeration subsystems, as shown in fig. 1, taking a three-stage evaporator and two independent refrigeration subsystems as examples, the first-stage refrigeration subsystem comprises a first evaporator E1 and a second evaporator E2 which are connected in parallel, and a compressor 1 and an outdoor condenser 2 which are exclusive to the first-stage refrigeration subsystem; the second stage refrigeration subsystem comprises a third evaporator E3, and a compressor 3 and an outdoor condenser 4 which are exclusive to the second stage refrigeration subsystem. The compressor 1 in the first-stage refrigeration subsystem and the compressor 3 in the second refrigeration subsystem work independently and do not interfere with each other; the outdoor condenser 2 in the first stage refrigeration subsystem and the outdoor condenser 4 in the second refrigeration subsystem work independently and do not interfere with each other.
It can be understood that, according to the technical scheme provided by this embodiment, the evaporator of the first-stage refrigeration subsystem is set as the first evaporator and the second evaporator which are connected in parallel, the air inlet temperature of the first-stage refrigeration subsystem is detected, and the working states of the refrigeration subsystems at different stages are controlled according to the air inlet temperature, so that the refrigeration system maintains the low air outlet temperature and the low evaporation temperature in the high-temperature environment, thereby improving the energy efficiency of the air conditioning unit and realizing energy-saving and efficient operation while satisfying the reliability.
Preferably, the system further comprises:
a first electronic expansion valve Y1 for adjusting the refrigerant flow rate of the first evaporator E1;
a second electronic expansion valve Y2, configured to adjust a refrigerant flow rate of the second evaporator E2;
the first electronic expansion valve Y1 and the second electronic expansion valve Y2 are respectively connected with the controller.
It should be noted that, the controller controls the operating states of the refrigeration subsystems at each stage, and includes:
and controlling the refrigerant flow of the first evaporator E1 and the second evaporator E2, and/or controlling the start and stop of other refrigeration subsystems at each stage.
The refrigerant flow rates of the first evaporator E1 and the second evaporator E2 are controlled by controlling the opening degrees of the first electronic expansion valve Y1 and the second electronic expansion valve Y2.
Fig. 2 is a flow chart illustrating a method of cooling a refrigeration system according to an exemplary embodiment, the method comprising, as shown in fig. 2:
step S11, detecting the air inlet temperature of the first-stage refrigeration subsystem;
and step S12, controlling the working state of each stage of refrigeration subsystem according to the air inlet temperature so as to enable the refrigeration system to maintain low air outlet temperature and low evaporation temperature in a high-temperature environment.
It should be noted that the technical solution provided in this embodiment is applicable to an air conditioning unit.
It can be understood that, according to the technical scheme provided by this embodiment, the evaporator of the first-stage refrigeration subsystem is set as the first evaporator and the second evaporator which are connected in parallel, the air inlet temperature of the first-stage refrigeration subsystem is detected, and the working states of the refrigeration subsystems at different stages are controlled according to the air inlet temperature, so that the refrigeration system maintains the low air outlet temperature and the low evaporation temperature in the high-temperature environment, thereby improving the energy efficiency of the air conditioning unit and realizing energy-saving and efficient operation while satisfying the reliability.
Preferably, the method further comprises:
detecting the running state of each stage of refrigeration subsystem;
the control of the working state of each stage of refrigeration subsystem comprises the following steps:
if the inlet air temperature is between a first temperature and a second temperature, controlling the refrigeration system to keep a current operation state; and/or the presence of a gas in the gas,
and if the inlet air temperature is not between the first temperature and the second temperature, controlling the working state of each stage of refrigeration subsystem according to the running state.
It should be noted that the first temperature is less than the second temperature, and the intake air temperature is between the first temperature and the second temperature, which means that the intake air temperature is not less than the first temperature and not more than the second temperature.
Preferably, the controlling the working state of each stage of the refrigeration subsystem comprises:
and controlling the refrigerant flow of the first evaporator and the second evaporator, and/or controlling the start and stop of other refrigeration subsystems at each stage.
Preferably, if the refrigeration system includes a first electronic expansion valve and a second electronic expansion valve respectively used for adjusting refrigerant flow rates of a first evaporator and a second evaporator, the controlling the refrigerant flow rates of the first evaporator and the second evaporator includes:
if the inlet air temperature is higher than the second temperature, detecting the evaporation pressure of the first evaporator, and if the evaporation pressure of the first evaporator is higher than a first preset pressure value, reducing the opening degree of the first electronic expansion valve and increasing the opening degree of the second electronic expansion valve;
if the inlet air temperature is lower than the first temperature, the evaporation pressure of the second evaporator and the outlet air temperature of the second evaporator are detected, if the evaporation pressure of the second evaporator is lower than a second preset pressure value and the outlet air temperature of the second evaporator is lower than a preset outlet air temperature value, the opening degree of the first electronic expansion valve is increased, and the opening degree of the second electronic expansion valve is decreased.
It should be noted that, if the intake air temperature is higher than the second temperature, the evaporation temperature of the first evaporator may be too high, so that the evaporation pressure of the first evaporator is detected, and if the evaporation pressure of the first evaporator is higher than a first preset pressure value, the opening degree of the first electronic expansion valve is decreased, and the opening degree of the second electronic expansion valve is increased.
If the inlet air temperature is lower than the first temperature, the evaporators of the second-stage and later refrigeration subsystems may be frozen and protected at low pressure, so that if the inlet air temperature is lower than the first temperature, the evaporation pressure of the second evaporator and the outlet air temperature of the second evaporator are detected, and if the evaporation pressure of the second evaporator is lower than a second preset pressure value and the outlet air temperature of the second evaporator is lower than a preset outlet air temperature value, the opening degree of the first electronic expansion valve is increased, and the opening degree of the second electronic expansion valve is decreased.
Preferably, the controlling the start and stop of the other stages of refrigeration subsystems comprises:
if the inlet air temperature is lower than the first temperature, detecting the evaporation pressure, the liquid pipe temperature and the outlet air temperature of the evaporators of other stages of refrigeration subsystems;
and if the evaporation pressure of the evaporator in any stage of other refrigeration subsystem is less than the respective preset pressure value, the temperature of the liquid pipe is less than the respective preset liquid pipe temperature value, and the air outlet temperature is less than the preset air outlet temperature value, the compressor of the stage of refrigeration subsystem is turned off.
It can be understood that, in the technical scheme provided in this embodiment, the evaporator of the first-stage refrigeration subsystem is set as the first evaporator and the second evaporator which are connected in parallel, and the refrigerant flow rates of the first evaporator and the second evaporator are automatically adjusted by detecting the air intake temperature and the operation state of each stage of refrigeration subsystem, so that the air conditioning unit can maintain the low air outlet temperature and the low evaporation temperature at the high ambient temperature; the number of the compressors to be started is adjusted at low ambient temperature, and the phenomenon that the trolley is pulled by a large horse is avoided, so that the air conditioning unit can run efficiently and energy-saving at various ambient temperatures.
Preferably, the opening degree of the first electronic expansion valve is decreased, and the opening degree of the second electronic expansion valve is increased, specifically:
and adjusting the opening degree of the first electronic expansion valve to be smaller according to a first preset amplitude and adjusting the opening degree of the second electronic expansion valve to be larger according to a second preset amplitude every other first preset time till the inlet air temperature is between the first temperature and the second temperature.
Preferably, the increasing the opening degree of the first electronic expansion valve and the decreasing the opening degree of the second electronic expansion valve specifically include:
and every second preset time interval, the opening degree of the first electronic expansion valve is increased according to a third preset amplitude, and the opening degree of the second electronic expansion valve is decreased according to a fourth preset amplitude until the inlet air temperature is between the first temperature and the second temperature.
It should be noted that the first preset time length and the second preset time length are set according to user requirements, and may be the same or different. For example, the first preset time period is set to 2 minutes, and the second preset time period is set to 3 minutes.
The first preset amplitude, the second preset amplitude, the third preset amplitude and the fourth preset amplitude are set according to user requirements, and can be the same or different. For example, a first preset amplitude is set to 10 °, a second preset amplitude is set to 15 °, a third preset amplitude is set to 20 °, a fourth preset amplitude is set to 25 °, and so on.
Therefore, the adjusting the opening degree of the first electronic expansion valve according to a first preset range and the adjusting the opening degree of the second electronic expansion valve according to a second preset range every a first preset duration may be:
every 2 minutes, the first electronic expansion valve was adjusted down by 10 °, and the second electronic expansion valve was adjusted up by 15 °.
Therefore, the step of increasing the opening degree of the first electronic expansion valve according to a third preset range and decreasing the opening degree of the second electronic expansion valve according to a fourth preset range every second preset duration may be:
every 3 minutes, the first electronic expansion valve was adjusted to 20 ° larger and the second electronic expansion valve was adjusted to 25 ° smaller.
Fig. 3 is a flow chart illustrating a method of cooling a refrigeration system according to another exemplary embodiment, as shown in fig. 3, the method comprising:
step S21, detecting the air inlet temperature of the first-stage refrigeration subsystem;
step S22, if the inlet air temperature is between the first temperature and the second temperature, controlling the refrigeration system to keep the current operation state;
step S23, if the inlet air temperature is higher than the second temperature, detecting the evaporation pressure of the first evaporator, and if the evaporation pressure of the first evaporator is higher than a first preset pressure value, reducing the opening degree of the first electronic expansion valve and increasing the opening degree of the second electronic expansion valve;
step S24, if the inlet air temperature is lower than the first temperature, detecting the evaporation pressure of the second evaporator and the outlet air temperature of the second evaporator, and if the evaporation pressure of the second evaporator is lower than a second preset pressure value and the outlet air temperature of the second evaporator is lower than a preset outlet air temperature value, increasing the opening degree of the first electronic expansion valve and decreasing the opening degree of the second electronic expansion valve;
step S25, if the inlet air temperature is lower than the first temperature, detecting the evaporation pressure, the liquid pipe temperature and the outlet air temperature of the evaporators of other stages of refrigeration subsystems; and if the evaporation pressure of the evaporator in any stage of other refrigeration subsystem is less than the respective preset pressure value, the temperature of the liquid pipe is less than the respective preset liquid pipe temperature value, and the air outlet temperature is less than the preset air outlet temperature value, the compressor of the stage of refrigeration subsystem is turned off.
It should be noted that the technical solution provided in this embodiment is applicable to an air conditioning unit.
It can be understood that, according to the technical scheme provided by this embodiment, the evaporator of the first-stage refrigeration subsystem is set as the first evaporator and the second evaporator which are connected in parallel, the air inlet temperature of the first-stage refrigeration subsystem is detected, and the working states of the refrigeration subsystems at different stages are controlled according to the air inlet temperature, so that the refrigeration system maintains the low air outlet temperature and the low evaporation temperature in the high-temperature environment, thereby improving the energy efficiency of the air conditioning unit and realizing energy-saving and efficient operation while satisfying the reliability.
An air conditioning assembly according to an exemplary embodiment of the present invention is shown, including:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to:
detecting the inlet air temperature of the first-stage refrigeration subsystem;
and controlling the working states of all stages of refrigeration subsystems according to the air inlet temperature so that the refrigeration systems maintain low air outlet temperature and low evaporation temperature in a high-temperature environment.
It can be understood that, according to the technical scheme provided by this embodiment, the evaporator of the first-stage refrigeration subsystem is set as the first evaporator and the second evaporator which are connected in parallel, the air inlet temperature of the first-stage refrigeration subsystem is detected, and the working states of the refrigeration subsystems at different stages are controlled according to the air inlet temperature, so that the refrigeration system maintains the low air outlet temperature and the low evaporation temperature in the high-temperature environment, thereby improving the energy efficiency of the air conditioning unit and realizing energy-saving and efficient operation while satisfying the reliability.
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 (11)
1. A refrigeration system, comprising:
the refrigeration system comprises a plurality of stages of mutually independent refrigeration subsystems, wherein a first-stage refrigeration subsystem comprises a first evaporator and a second evaporator which are connected in parallel;
the detection module is used for detecting the air inlet temperature of the first-stage refrigeration subsystem;
and the controller is used for controlling the working state of each stage of refrigeration subsystem according to the air inlet temperature so as to enable the refrigeration system to maintain low air outlet temperature and low evaporation temperature in a high-temperature environment.
2. The system of claim 1, wherein the controller controls the operating state of each stage of the refrigeration subsystem, comprising:
and controlling the refrigerant flow of the first evaporator and the second evaporator, and/or controlling the start and stop of other refrigeration subsystems at each stage.
3. The system of claim 2, further comprising:
the first electronic expansion valve is used for adjusting the refrigerant flow of the first evaporator;
the second electronic expansion valve is used for adjusting the refrigerant flow of the second evaporator;
the first electronic expansion valve and the second electronic expansion valve are respectively connected with the controller.
4. A method of refrigerating a refrigeration system, comprising:
detecting the inlet air temperature of the first-stage refrigeration subsystem;
controlling the working state of each stage of refrigeration subsystem according to the air inlet temperature so as to enable the refrigeration system to maintain low air outlet temperature and low evaporation temperature in a high-temperature environment;
the refrigeration system includes: the refrigeration system comprises a plurality of stages of mutually independent refrigeration subsystems, wherein the first stage refrigeration subsystem comprises a first evaporator and a second evaporator which are connected in parallel.
5. The method of claim 4, further comprising:
detecting the running state of each stage of refrigeration subsystem;
the control of the working state of each stage of refrigeration subsystem comprises the following steps:
if the inlet air temperature is between a first temperature and a second temperature, controlling the refrigeration system to keep a current operation state; and/or the presence of a gas in the gas,
and if the inlet air temperature is not between the first temperature and the second temperature, controlling the working state of each stage of refrigeration subsystem according to the running state.
6. The method of claim 5, wherein controlling the operating state of each stage of the refrigeration subsystem comprises:
and controlling the refrigerant flow of the first evaporator and the second evaporator, and/or controlling the start and stop of other refrigeration subsystems at each stage.
7. The method of claim 6, wherein if the refrigeration system includes a first electronic expansion valve and a second electronic expansion valve for adjusting refrigerant flow rates of a first evaporator and a second evaporator, respectively, the controlling the refrigerant flow rates of the first evaporator and the second evaporator comprises:
if the inlet air temperature is higher than the second temperature, detecting the evaporation pressure of the first evaporator, and if the evaporation pressure of the first evaporator is higher than a first preset pressure value, reducing the opening degree of the first electronic expansion valve and increasing the opening degree of the second electronic expansion valve;
if the inlet air temperature is lower than the first temperature, the evaporation pressure of the second evaporator and the outlet air temperature of the second evaporator are detected, if the evaporation pressure of the second evaporator is lower than a second preset pressure value and the outlet air temperature of the second evaporator is lower than a preset outlet air temperature value, the opening degree of the first electronic expansion valve is increased, and the opening degree of the second electronic expansion valve is decreased.
8. The method of claim 6, wherein controlling the start-stop of the other stages of refrigeration subsystems comprises:
if the inlet air temperature is lower than the first temperature, detecting the evaporation pressure, the liquid pipe temperature and the outlet air temperature of the evaporators of other stages of refrigeration subsystems;
and if the evaporation pressure of the evaporator in any stage of other refrigeration subsystem is less than the respective preset pressure value, the temperature of the liquid pipe is less than the respective preset liquid pipe temperature value, and the air outlet temperature is less than the preset air outlet temperature value, the compressor of the stage of refrigeration subsystem is turned off.
9. The method of claim 7,
the opening degree of the first electronic expansion valve is decreased, and the opening degree of the second electronic expansion valve is increased, specifically:
and adjusting the opening degree of the first electronic expansion valve to be smaller according to a first preset amplitude and adjusting the opening degree of the second electronic expansion valve to be larger according to a second preset amplitude every other first preset time till the inlet air temperature is between the first temperature and the second temperature.
10. The method of claim 7,
the opening degree of the first electronic expansion valve is increased, and the opening degree of the second electronic expansion valve is decreased, specifically:
and every second preset time interval, the opening degree of the first electronic expansion valve is increased according to a third preset amplitude, and the opening degree of the second electronic expansion valve is decreased according to a fourth preset amplitude until the inlet air temperature is between the first temperature and the second temperature.
11. An air conditioning assembly, comprising:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to:
detecting the inlet air temperature of the first-stage refrigeration subsystem;
controlling the working state of each stage of refrigeration subsystem according to the air inlet temperature so as to enable the refrigeration system to maintain low air outlet temperature and low evaporation temperature in a high-temperature environment;
the refrigeration system includes: the refrigeration system comprises a plurality of stages of mutually independent refrigeration subsystems, wherein the first stage refrigeration subsystem comprises a first evaporator and a second evaporator which are connected in parallel.
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