CN114110847A - Refrigerating system, control method and device thereof and storage medium - Google Patents
Refrigerating system, control method and device thereof and storage medium Download PDFInfo
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- CN114110847A CN114110847A CN202111414320.8A CN202111414320A CN114110847A CN 114110847 A CN114110847 A CN 114110847A CN 202111414320 A CN202111414320 A CN 202111414320A CN 114110847 A CN114110847 A CN 114110847A
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000004065 semiconductor Substances 0.000 claims abstract description 158
- 238000005057 refrigeration Methods 0.000 claims abstract description 86
- 239000012530 fluid Substances 0.000 claims abstract description 59
- 238000010248 power generation Methods 0.000 claims abstract description 32
- 239000003507 refrigerant Substances 0.000 claims abstract description 21
- 238000004590 computer program Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 5
- 230000006870 function Effects 0.000 description 12
- 238000001816 cooling Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 230000008859 change Effects 0.000 description 6
- 238000004088 simulation Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0042—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater characterised by the application of thermo-electric units or the Peltier effect
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N11/00—Generators or motors not provided for elsewhere; Alleged perpetua mobilia obtained by electric or magnetic means
- H02N11/002—Generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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Abstract
The invention provides a refrigeration system, a control method and a control device thereof, and a storage medium, wherein the refrigeration system is provided with a semiconductor power generation device and a semiconductor refrigeration device; the semiconductor power generation device is used for absorbing heat of fluid at the outlet of the condenser to generate electric energy and supplying power to the semiconductor refrigeration device; the semiconductor refrigerating device is used for exchanging heat with a refrigerant in the condenser, so that the condenser is cooled. The scheme provided by the invention can utilize the heat discharged by the condenser to generate electric energy, and can reduce the temperature of the outlet fluid and reduce the greenhouse effect.
Description
Technical Field
The present invention relates to the field of control, and in particular, to a refrigeration system, a control method and apparatus thereof, and a storage medium.
Background
When the air-conditioning condenser is used for cooling by air cooling, the outdoor environment temperature in summer can reach 38 ℃, the temperature of India and the middle east can reach more than 45 ℃, the duration is longer, the higher the outdoor environment temperature is, the smaller the refrigerating capacity of the air conditioner is, and the larger the power consumption is.
Disclosure of Invention
The present invention is directed to overcome the above-mentioned drawbacks of the related art, and provides a refrigeration system, a control method thereof, a control device thereof, and a storage medium thereof, so as to solve the problem in the related art that when an air conditioner condenser uses air cooling to dissipate heat, the higher the outdoor environment temperature is, the smaller the cooling capacity of the air conditioner is, and the larger the power consumption is.
The invention provides a refrigeration system, which is provided with a semiconductor power generation device and a semiconductor refrigeration device; the semiconductor power generation device is used for absorbing heat of fluid at the outlet of the condenser to generate electric energy and supplying power to the semiconductor refrigeration device; the semiconductor refrigerating device is used for exchanging heat with a refrigerant in the condenser, so that the condenser is cooled.
Optionally, an inlet of a condenser of the refrigeration system is connected with a cold end of the semiconductor refrigeration device through a pipeline, and a fluid flows into the cold end of the semiconductor refrigeration device to be cooled, then flows into the condenser through the inlet of the condenser, and exchanges heat with a refrigerant in the condenser; and/or the outlet of the condenser is connected with the hot end of the semiconductor power generation device through a pipeline, and the fluid heated by the condenser flows to the semiconductor power generation device, so that the semiconductor power generation device can absorb the heat of the fluid at the outlet of the condenser to generate electric energy.
Optionally, the semiconductor power generation device is connected with a storage battery, electric energy generated by the semiconductor power generation device is stored in the storage battery, and the storage battery supplies power to the semiconductor refrigeration device.
Optionally, two or more semiconductor refrigeration devices are arranged in the refrigeration system along the flow direction of the fluid, the two or more semiconductor refrigeration devices are connected in parallel, and the fluid flows through each of the two or more semiconductor refrigeration devices.
Optionally, the method further comprises: a temperature detection device is arranged at a condenser inlet of the refrigeration system and used for detecting the temperature of fluid at the condenser inlet.
In another aspect, the present invention provides a method for controlling a refrigeration system according to any one of the preceding claims, including: when the refrigerating system is in a starting state, comparing the temperature deviation of the indoor temperature and the set temperature with the set deviation; when the temperature deviation value is larger than a set deviation, determining the target frequency of a compressor of the refrigerating system, the rotating speed of a fan and the current of the semiconductor refrigerating device by utilizing a preset first heat exchange model according to the indoor temperature and the set temperature;
when the temperature deviation value is smaller than or equal to a set deviation, determining the target frequency of a compressor of the refrigerating system, the rotating speed of a fan and the current of the semiconductor refrigerating device by using a preset second heat exchange model according to the indoor temperature and the set temperature; and controlling the refrigerating system according to the determined target frequency of the compressor, the rotating speed of the fan and the current of the semiconductor refrigerating device.
Optionally, the first heat exchange model is used for obtaining the compressor frequency, the fan rotating speed and the current of the semiconductor refrigeration device under the shortest condition when the temperature reaches a set temperature; and the second heat exchange model is used for obtaining the compressor frequency, the fan rotating speed and the current of the semiconductor refrigerating device under the condition of minimum system power consumption.
In another aspect, the present invention provides a control device of a refrigeration system as described in any one of the preceding claims, including: the comparison unit is used for comparing the temperature deviation of the indoor temperature and the set temperature with the set deviation when the refrigeration system is in a starting state; the determining unit is used for determining the target frequency of a compressor of the refrigerating system, the rotating speed of a fan and the current of the semiconductor refrigerating device by utilizing a preset first heat exchange model according to the indoor temperature and the set temperature when the temperature deviation value is larger than the set deviation; when the temperature deviation value is smaller than or equal to a set deviation, determining the target frequency of a compressor of the refrigerating system, the rotating speed of a fan and the current of the semiconductor refrigerating device by using a preset second heat exchange model according to the indoor temperature and the set temperature; and the control unit is used for controlling the refrigerating system according to the target frequency of the compressor, the rotating speed of the fan and the current of the semiconductor refrigerating device determined by the determination unit.
Optionally, the first heat exchange model is used for obtaining the compressor frequency, the fan rotating speed and the current of the semiconductor refrigeration device under the shortest condition when the temperature reaches a set temperature; and the second heat exchange model is used for obtaining the compressor frequency, the fan rotating speed and the current of the semiconductor refrigerating device under the condition of minimum system power consumption.
A further aspect of the invention provides a storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of any of the methods described above.
According to the technical scheme of the invention, the semiconductor refrigerating device is positioned in front of the inlet of the condenser in the refrigerating system, the radiator at the cold end of the semiconductor refrigerating device is connected with the inlet of the condenser through a pipeline, and fluid flows into the condenser after being cooled by the semiconductor refrigerating device to absorb the heat of a refrigerant in the condenser. The fluid at the outlet of the condenser flows to the hot end of the semiconductor temperature difference power generation device, so that the semiconductor temperature difference power generation device generates electric energy. The heat discharged by the condenser is utilized to generate electric energy, and the temperature of the outlet fluid can be reduced, thereby reducing the greenhouse effect. The fluid entering the condenser is cooled through the semiconductor refrigerating sheet, the temperature of the fluid at the inlet of the condenser is reduced, the temperature of a refrigerant in the condenser is reduced, and the refrigerating capacity is improved. The temperature of refrigerant in the condenser is reduced, the condensing pressure is reduced, the power consumption of the compressor can be reduced, and the purpose of energy conservation is achieved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 illustrates a schematic diagram of a refrigeration system provided by the present invention;
FIG. 2 is a schematic diagram of a prior art refrigeration system;
FIG. 3 is a schematic structural view of a semiconductor refrigeration device;
FIG. 4 is a method schematic of an embodiment of a method of controlling a refrigeration system provided by the present invention;
FIG. 5 is a control logic diagram for a refrigeration system provided by the present invention;
fig. 6 is a schematic structural diagram of an embodiment of a control device of a refrigeration system provided by the invention.
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 clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. 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 embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the existing refrigeration heat exchange system, the heat of the condenser is directly discharged to the atmosphere, the outdoor environment temperature is further increased, the greenhouse effect is intensified, in addition, the power consumption of the compressor is increased due to overhigh outdoor environment, the exhaust temperature and the exhaust pressure of the compressor are overhigh, and the protective shutdown is realized.
Fig. 2 is a prior art refrigeration system comprising a condenser 5, an evaporator 6, a compressor 7 and a throttle valve 8. In the existing refrigeration system, the heat energy of the high-temperature fluid at the outlet of the condenser 5 is not utilized, especially, the outdoor side of the household air conditioner adopts air cooling for heat dissipation, the outdoor side fluid is air, and the high-temperature fluid is directly discharged to the atmosphere, so that the greenhouse effect is intensified.
The invention provides a refrigeration system. The refrigeration system generates electric energy by utilizing the heat of high-temperature fluid at the outlet of the condenser, then the generated electric energy is used for supplying power to the semiconductor refrigeration device, and meanwhile, the semiconductor refrigeration device is used for cooling the fluid entering the condenser.
Figure 1 shows a schematic diagram of a refrigeration system provided by the present invention. The refrigeration system comprises a condenser 5, an evaporator 6, a compressor 7 and a throttle valve 8. The refrigerating system is provided with a semiconductor power generation device 1 and a semiconductor refrigerating device 2. The semiconductor power generation device 1 is used for absorbing heat of fluid at the outlet of the condenser to generate electric energy and supplying power to the semiconductor refrigeration device; the semiconductor refrigerating device 2 is used for exchanging heat with a refrigerant in the condenser, so that the condenser is cooled.
The inlet of the condenser is connected with the cold end of the semiconductor refrigerating device 2 through a pipeline, and fluid (such as air in the external environment) flows into the cold end of the semiconductor refrigerating device 2 to be cooled and then flows into the condenser to exchange heat with a refrigerant in the condenser to absorb heat of the refrigerant. The fluid is air. The outdoor air exchanges heat with the condenser under the action of the fan to absorb the heat of the condenser. The outlet of the condenser is connected with the hot end of the semiconductor temperature difference power generation device 1 through a pipeline, the fluid heated by the condenser flows to the semiconductor temperature difference power generation device 1, and the semiconductor power generation device 1 absorbs the heat of the fluid at the outlet of the condenser to generate electric energy. The electric energy generated by the semiconductor power generation device is used for supplying power to the semiconductor refrigeration device.
The semiconductor power generation device 1 is specifically a semiconductor thermoelectric power generation device, and includes: the thermoelectric power generation device comprises a semiconductor thermoelectric power generation sheet, a cold-end heat exchanger and a hot-end heat exchanger.
Fig. 3 is a schematic structural view of a semiconductor refrigeration apparatus. As shown in fig. 3, the semiconductor refrigeration device 2 includes a semiconductor refrigeration sheet 22, a cold-side heat exchanger 21, and a hot-side heat exchanger 23.
The semiconductor power generation device 1 is connected with a storage battery 3, electric energy generated by the semiconductor power generation device 1 is stored in the storage battery 3, and power is supplied to the semiconductor refrigeration device 2 through the storage battery 3.
The number of the semiconductor refrigerating devices 2 is one or more than two. Specifically, two or more semiconductor refrigeration devices are arranged in the refrigeration system along the flow direction of the fluid, the two or more semiconductor refrigeration devices are connected in parallel, and the fluid flows through each semiconductor refrigeration device in the two or more semiconductor refrigeration devices.
Optionally, a temperature sensing device, such as a thermocouple, is disposed at the condenser inlet of the refrigeration system for sensing the temperature of the fluid at the condenser inlet. An indoor temperature sensor and an outdoor temperature sensor are arranged in the system, and the indoor temperature sensor and the outdoor temperature sensor transmit detected temperature values to the controller 4.
And obtaining the number and the current magnitude of the semiconductor refrigerating devices required to work by calculating the temperature of the fluid at the inlet of the condenser under the condition of the maximum refrigerating capacity of the refrigerating system and according to a change relation curve of the temperature of the fluid at the inlet of the condenser along with the number of the semiconductor refrigerating devices and/or the current magnitude of the semiconductor refrigerating devices.
In a specific embodiment, the condenser fluid inlet temperature under the maximum refrigerating capacity of the refrigerating system is calculated by an air conditioner heat exchange simulation program by taking the refrigerating capacity of the refrigerating system as an objective function and taking the condenser fluid inlet temperature as a design variable.
In a specific embodiment, the number of the semiconductor refrigeration devices and/or the current magnitude are changed, and the fluid temperature at the inlet of the condenser is changed accordingly, so that the change relation curve of the fluid temperature value at the inlet of the condenser along with the change of the number of the semiconductor refrigeration devices and/or the current magnitude of the semiconductor refrigeration devices can be obtained by changing the number of the semiconductor refrigeration devices and/or the current magnitude of the semiconductor refrigeration devices through experiments.
And obtaining a change relation curve of the temperature of the fluid at the inlet of the condenser and the temperature value of the fluid at the inlet of the condenser under the maximum refrigerating capacity of the refrigerating system along with the change of the number of the semiconductor refrigerating devices and/or the current magnitude of the semiconductor refrigerating devices, namely searching the number of the semiconductor refrigerating devices needing to work and the current magnitude according to the change relation curve.
The invention also provides a control method of the refrigeration system according to any one of the embodiments.
Fig. 4 is a method schematic diagram of an embodiment of a control method of a refrigeration system provided by the present invention.
As shown in fig. 4, according to an embodiment of the present invention, the control method includes at least step S110, step S120, step S130, and step S140.
And step S110, comparing the temperature deviation between the indoor temperature and the set temperature with the set deviation when the refrigerating system is in the starting state.
When the refrigerating system is in a starting state, the indoor temperature and the set temperature are obtained. Specifically, a user selects a cooling mode or a dehumidifying mode according to a demand, then, the temperature sensor transmits a detected indoor temperature to the controller, the controller displays an indoor temperature value, then, the user sets a set temperature value, calculates a temperature deviation | T-T1| of the indoor temperature T from the set temperature T1, that is, an absolute value of a difference between the set temperature and the indoor temperature, and compares the temperature deviation with a set deviation a (e.g., 0.5 ℃).
And S120, when the temperature deviation value is larger than a set deviation, determining the target frequency of a compressor of the refrigerating system, the rotating speed of a fan and the current of the semiconductor refrigerating device by using a preset first heat exchange model according to the indoor temperature and the set temperature.
Specifically, the first heat exchange model is used for obtaining the compressor frequency, the fan rotating speed and the current of the semiconductor refrigeration device under the shortest time condition when the set temperature is reached. The first heat exchange model is a partial differential equation of heat exchange of a refrigerant in the whole refrigerating system, the inlet air temperature of the condenser fluid in the heat exchange model is a function taking the current value of the semiconductor refrigerating device as an independent variable, the functional relation can be obtained through tests or simulation, for example, the inlet air temperature of the condenser fluid under different currents is obtained by adjusting the current value of the semiconductor refrigerating device, then the obtained experimental data is fitted into the functional relation, and the refrigerating capacity can be obtained through the first heat exchange model.
And S130, when the temperature deviation value is smaller than or equal to a set deviation, determining the target frequency of a compressor, the rotating speed of a fan and the current of the semiconductor refrigerating device of the refrigerating system by using a preset second heat exchange model according to the indoor temperature and the set temperature.
Specifically, the second heat exchange model is used for obtaining the compressor frequency, the fan rotating speed and the current of the semiconductor refrigerating device under the condition of minimum system power consumption. The second heat exchange model is a partial differential equation of heat exchange of the refrigerant in the whole refrigerating system, the inlet air temperature of the condenser fluid in the heat exchange model is a function taking the current value of the semiconductor refrigerating device as an independent variable, the functional relation can be obtained through tests or simulation, for example, the inlet air temperature of the condenser fluid under different currents is obtained by adjusting the current value of the semiconductor refrigerating device, then the obtained experimental data is fitted into the functional relation, and the refrigerating capacity and the system power consumption of the refrigerating space of the system can be obtained through the heat exchange model.
And S140, controlling the refrigerating system according to the determined target frequency of the compressor, the rotating speed of the fan and the current of the semiconductor refrigerating device.
And calculating the compressor frequency, the fan rotating speed and the current of the semiconductor refrigerating device in the shortest time of reaching the set temperature T1 by using the first heat exchange model, or calculating the compressor frequency, the fan rotating speed and the current of the semiconductor refrigerating device under the condition of the minimum system power consumption by using the second heat exchange model, and then adjusting the compressor frequency, the fan rotating speed and the current of the semiconductor refrigerating device according to the calculated compressor frequency, the fan rotating speed and the current of the semiconductor refrigerating device.
Under the condition that the target frequency of a compressor, the rotating speed of a fan and the current of a semiconductor refrigerating device of the refrigerating system are determined by utilizing a preset first heat exchange model, and the refrigerating system is controlled according to the determined target frequency of the compressor, the rotating speed of the fan and the current of the semiconductor refrigerating device, whether the indoor temperature is stable or not is judged at intervals of a first preset time, and if the indoor temperature is judged to be stable, the temperature deviation between the indoor temperature and the set temperature is compared with the set deviation again. And if the indoor temperature is judged to be unstable, the frequency of the compressor, the rotating speed of the fan and the current of the semiconductor refrigerating sheet are maintained at the current values.
For example, every time Δ t1 (the value of Δ t1 is between 30s-2 min), the indoor temperature sensor transmits the temperature value to the controller, and the controller determines whether the room temperature is stable, and the determination method is as follows: the difference between the indoor temperature value at the previous moment and the indoor temperature value at the previous moment, and the difference between the indoor temperature value at the current moment and the indoor temperature value at the previous moment T are all within a preset temperature range (for example, within a range of +/-0.2 ℃), that is, the room temperature is considered to be stable. When the room temperature is stabilized, the indoor temperature value T is compared with the set temperature T1.
And under the condition that the target frequency of a compressor, the rotating speed of a fan and the current of the semiconductor refrigerating device of the refrigerating system are determined by utilizing a preset second heat exchange model, and the refrigerating system is controlled according to the determined target frequency of the compressor, the rotating speed of the fan and the current of the semiconductor refrigerating device, comparing the temperature deviation of the indoor temperature and the set temperature with the set deviation at intervals of second preset time.
For example, every time Δ T2 (the value of Δ T2 may be set between 5-20s, for example), the indoor temperature sensor transmits the temperature value T, the outdoor temperature sensor transmits the outdoor temperature value T0 to the controller, and the controller determines the relationship of | T-T1| and a.
For clarity of explaining the technical solution of the present invention, the following describes an implementation flow of the control method of the refrigeration system according to an embodiment of the present invention.
Fig. 5 is a control logic diagram for a refrigeration system provided by the present invention. As shown in fig. 5, T0 is the outdoor temperature, T is the indoor temperature, T1 is the set temperature, a is the set deviation, and Δ T1 and Δ T2 are time intervals.
When the refrigeration system is in a starting state, a user selects a refrigeration mode or a dehumidification mode according to the requirement, then the temperature sensor transmits the detected indoor temperature to the controller, the controller displays the indoor temperature value, then the user sets a set temperature value, then the controller calculates a temperature deviation value | T-T1| of the indoor temperature T and the set temperature T1, namely an absolute value of a difference value between the set temperature and the indoor temperature, and compares the temperature deviation with a set deviation a (for example, 0.5 ℃).
When the temperature deviation value | T-T1| is greater than the set deviation a, the controller brings the temperature set point T1 and the room temperature T into the procedure 1.
The procedure 1 is an optimization model, namely a first heat exchange model, which takes the maximum cooling capacity of the system as a target, and the model is as follows: the method comprises the steps of establishing a first heat exchange model of the refrigerating system, wherein the first heat exchange model is a partial differential equation of heat exchange of a refrigerant in the whole refrigerating system, the inlet air temperature of condenser fluid in the heat exchange model is a function taking the current value of the semiconductor refrigerating device as an independent variable, the functional relation can be obtained through tests or simulation, for example, the inlet air temperature of the condenser fluid under different currents is obtained by adjusting the current value of the semiconductor refrigerating device, then the obtained experimental data is fitted into the functional relation, and the refrigerating capacity can be obtained through the first heat exchange model.
In the program 1, the compressor frequency, the fan rotating speed and the current of the semiconductor refrigerating device are taken as design variables, the refrigerating capacity is taken as a target function, the system power consumption is taken as a constraint condition, and the compressor frequency, the fan rotating speed and the current of the semiconductor refrigerating device in the shortest time of reaching the set temperature T1 are calculated. And then adjusting the frequency of the compressor, the rotating speed of the fan and the current of the semiconductor refrigerating device according to the calculated frequency of the compressor, the rotating speed of the fan and the current of the semiconductor refrigerating device in the shortest time of reaching the set temperature T1.
Then, every time Δ t1 (the value of Δ t1 is between 30s-2 min), the indoor temperature sensor transmits the temperature value to the controller, and the controller judges whether the room temperature is stable or not, wherein the judgment method comprises the following steps: the difference between the indoor temperature value at the previous moment and the indoor temperature value at the previous moment, and the difference between the indoor temperature value at the current moment and the indoor temperature value at the previous moment T are all within a preset temperature range (for example, within a range of +/-0.2 ℃), that is, the room temperature is considered to be stable. When the room temperature is stable, the indoor temperature value T is compared with the set temperature T1, and it is determined whether | T-T1| is greater than a. When the indoor temperature is unstable, the frequency of the compressor, the rotating speed of the fan and the current of the semiconductor refrigerating sheet are maintained at the previous values.
When the temperature deviation value | T-T1| is less than or equal to the setting deviation a, the controller brings the setting temperature T1 and the room temperature T into the program 2.
The program 2 is an optimization model with the system power consumption as a target, namely a second heat exchange model, and the model is as follows: the method comprises the steps of establishing a second heat exchange model of the refrigerating system, wherein the second heat exchange model is a partial differential equation of heat exchange of a refrigerant in the whole refrigerating system, the inlet air temperature of condenser fluid in the heat exchange model is a function taking the current value of the semiconductor refrigerating device as an independent variable, the functional relation can be obtained through tests or simulation, for example, the inlet air temperature of the condenser fluid under different currents is obtained by adjusting the current value of the semiconductor refrigerating device, then the obtained experimental data is fitted into the functional relation, and the refrigerating capacity and the system power consumption of a refrigerating space of the system can be obtained through the heat exchange model.
And 2, calculating the frequency of the compressor, the rotating speed of the fan and the current of the semiconductor refrigerating device under the condition of minimum system power consumption by taking the frequency of the compressor, the rotating speed of the fan and the current of the semiconductor refrigerating device as design variables, taking the system power consumption as a target function and taking the refrigerating capacity as a constraint condition. And then adjusting the frequency of the compressor, the rotating speed of the fan and the current of the semiconductor refrigerating device according to the calculated frequency of the compressor, the rotating speed of the fan and the calculated current of the semiconductor refrigerating device under the condition of minimum system power consumption.
Then, at intervals of Δ T2 (the value of Δ T2 may be set to be between 5 and 20s, for example), the indoor temperature sensor transmits the temperature value T and the outdoor temperature sensor transmits the outdoor temperature value T0 to the controller, and the controller determines the relationship between | T-T1| and a.
The invention also provides a control device of the refrigeration system according to any one of the above embodiments.
Fig. 6 is a schematic structural diagram of an embodiment of a control device of a refrigeration system provided by the invention. As shown in fig. 6, the control apparatus 100 includes a comparison unit 110, a determination unit 120, and a control unit 130.
The comparing unit 110 is configured to compare a temperature deviation between the indoor temperature and the set temperature with the set deviation when the refrigeration system is in the on state.
When the refrigerating system is in a starting state, the indoor temperature and the set temperature are obtained. Specifically, a user selects a cooling mode or a dehumidifying mode according to a demand, then, the temperature sensor transmits a detected indoor temperature to the controller, the controller displays an indoor temperature value, then, the user sets a set temperature value, calculates a temperature deviation | T-T1| of the indoor temperature T from the set temperature T1, that is, an absolute value of a difference between the set temperature and the indoor temperature, and compares the temperature deviation with a set deviation a (e.g., 0.5 ℃).
The determining unit 120 is configured to determine, according to the indoor temperature and the set temperature, a target frequency of a compressor of the refrigeration system, a rotational speed of a fan, and a current of the semiconductor refrigeration device by using a preset first heat exchange model when the temperature deviation value is greater than a set deviation; and when the temperature deviation value is less than or equal to a set deviation, determining the target frequency of a compressor of the refrigerating system, the rotating speed of a fan and the current of the semiconductor refrigerating device by using a preset second heat exchange model according to the indoor temperature and the set temperature.
Specifically, the first heat exchange model is used for obtaining the compressor frequency, the fan rotating speed and the current of the semiconductor refrigeration device under the shortest time condition when the set temperature is reached. The first heat exchange model is a partial differential equation of heat exchange of a refrigerant in the whole refrigerating system, the inlet air temperature of the condenser fluid in the heat exchange model is a function taking the current value of the semiconductor refrigerating device as an independent variable, the functional relation can be obtained through tests or simulation, for example, the inlet air temperature of the condenser fluid under different currents is obtained by adjusting the current value of the semiconductor refrigerating device, then the obtained experimental data is fitted into the functional relation, and the refrigerating capacity can be obtained through the first heat exchange model. And the second heat exchange model is used for obtaining the compressor frequency, the fan rotating speed and the current of the semiconductor refrigerating device under the condition of minimum system power consumption. The second heat exchange model is a partial differential equation of heat exchange of the refrigerant in the whole refrigerating system, the inlet air temperature of the condenser fluid in the heat exchange model is a function taking the current value of the semiconductor refrigerating device as an independent variable, the functional relation can be obtained through tests or simulation, for example, the inlet air temperature of the condenser fluid under different currents is obtained by adjusting the current value of the semiconductor refrigerating device, then the obtained experimental data is fitted into the functional relation, and the refrigerating capacity and the system power consumption of the refrigerating space of the system can be obtained through the heat exchange model.
The control unit 130 is configured to control the refrigeration system according to the target frequency of the compressor, the rotating speed of the fan, and the current of the semiconductor refrigeration device determined by the determining unit.
And calculating the compressor frequency, the fan rotating speed and the current of the semiconductor refrigerating device in the shortest time of reaching the set temperature T1 by using the first heat exchange model, or calculating the compressor frequency, the fan rotating speed and the current of the semiconductor refrigerating device under the condition of the minimum system power consumption by using the second heat exchange model, and then adjusting the compressor frequency, the fan rotating speed and the current of the semiconductor refrigerating device according to the calculated compressor frequency, the fan rotating speed and the current of the semiconductor refrigerating device.
Under the condition that the target frequency of a compressor, the rotating speed of a fan and the current of a semiconductor refrigerating device of the refrigerating system are determined by utilizing a preset first heat exchange model, and the refrigerating system is controlled according to the determined target frequency of the compressor, the rotating speed of the fan and the current of the semiconductor refrigerating device, whether the indoor temperature is stable or not is judged at intervals of a first preset time, and if the indoor temperature is judged to be stable, the temperature deviation between the indoor temperature and the set temperature is compared with the set deviation again. And if the indoor temperature is judged to be unstable, the frequency of the compressor, the rotating speed of the fan and the current of the semiconductor refrigerating sheet are maintained at the current values.
For example, every time Δ t1 (the value of Δ t1 is between 30s-2 min), the indoor temperature sensor transmits the temperature value to the controller, and the controller determines whether the room temperature is stable, and the determination method is as follows: the difference between the indoor temperature value at the previous moment and the indoor temperature value at the previous moment, and the difference between the indoor temperature value at the current moment and the indoor temperature value at the previous moment T are all within a preset temperature range (for example, within a range of +/-0.2 ℃), that is, the room temperature is considered to be stable. When the room temperature is stabilized, the indoor temperature value T is compared with the set temperature T1.
And under the condition that the target frequency of a compressor, the rotating speed of a fan and the current of the semiconductor refrigerating device of the refrigerating system are determined by utilizing a preset second heat exchange model, and the refrigerating system is controlled according to the determined target frequency of the compressor, the rotating speed of the fan and the current of the semiconductor refrigerating device, comparing the temperature deviation of the indoor temperature and the set temperature with the set deviation at intervals of second preset time.
For example, every time Δ T2 (the value of Δ T2 may be set between 5-20s, for example), the indoor temperature sensor transmits the temperature value T, the outdoor temperature sensor transmits the outdoor temperature value T0 to the controller, and the controller determines the relationship of | T-T1| and a.
The above process is the first cycle of fig. 5, which is performed a second cycle after the first cycle has ended.
The invention also provides a storage medium corresponding to the control method of the refrigeration system, on which a computer program is stored, which program, when executed by a processor, carries out the steps of any of the methods described above.
According to the scheme provided by the invention, the semiconductor refrigerating device is positioned in front of the inlet of the condenser in the refrigerating system, the radiator at the cold end of the semiconductor refrigerating device is connected with the inlet of the condenser through a pipeline, and fluid flows into the condenser after being cooled by the semiconductor refrigerating device to absorb the heat of a refrigerant in the condenser. The fluid at the outlet of the condenser flows to the hot end of the semiconductor temperature difference power generation device, so that the semiconductor temperature difference power generation device generates electric energy. The heat discharged by the condenser is utilized to generate electric energy, and the temperature of the outlet fluid can be reduced, thereby reducing the greenhouse effect. The fluid entering the condenser is cooled through the semiconductor refrigerating sheet, the temperature of the fluid at the inlet of the condenser is reduced, the temperature of a refrigerant in the condenser is reduced, and the refrigerating capacity is improved. The temperature of refrigerant in the condenser is reduced, the condensing pressure is reduced, the power consumption of the compressor can be reduced, and the purpose of energy conservation is achieved.
The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope and spirit of the invention and the following claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwired, or a combination of any of these. In addition, each functional unit may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and the parts serving as the control device may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. The refrigerating system is characterized by being provided with a semiconductor power generation device and a semiconductor refrigerating device;
the semiconductor power generation device is used for absorbing heat of fluid at the outlet of the condenser to generate electric energy and supplying power to the semiconductor refrigeration device;
the semiconductor refrigerating device is used for exchanging heat with a refrigerant in the condenser, so that the condenser is cooled.
2. The refrigerant system as set forth in claim 1, including:
an inlet of a condenser of the refrigerating system is connected with the cold end of the semiconductor refrigerating device through a pipeline, fluid flows into the cold end of the semiconductor refrigerating device to be cooled, then flows into the condenser through the inlet of the condenser, and exchanges heat with a refrigerant in the condenser;
and/or the presence of a gas in the gas,
the outlet of the condenser is connected with the hot end of the semiconductor power generation device through a pipeline, and the fluid heated by the condenser flows to the semiconductor power generation device, so that the semiconductor power generation device can absorb the heat of the fluid at the outlet of the condenser to generate electric energy.
3. The refrigeration system according to claim 1 or 2, wherein the semiconductor power generation device is connected with a storage battery, and the electric energy generated by the semiconductor power generation device is stored in the storage battery, and the semiconductor refrigeration device is powered by the storage battery.
4. A refrigeration system according to any one of claims 1 to 3, wherein two or more semiconductor refrigeration devices are arranged in the refrigeration system along the direction of fluid flow, the two or more semiconductor refrigeration devices being connected in parallel, fluid flowing through each of the two or more semiconductor refrigeration devices.
5. The refrigeration system according to any one of claims 1 to 4, further comprising:
a temperature detection device is arranged at a condenser inlet of the refrigeration system and used for detecting the temperature of fluid at the condenser inlet.
6. A control method of a refrigeration system according to any one of claims 1 to 5, comprising:
when the refrigerating system is in a starting state, comparing the temperature deviation of the indoor temperature and the set temperature with the set deviation;
when the temperature deviation value is larger than a set deviation, determining the target frequency of a compressor of the refrigerating system, the rotating speed of a fan and the current of the semiconductor refrigerating device by utilizing a preset first heat exchange model according to the indoor temperature and the set temperature;
when the temperature deviation value is smaller than or equal to a set deviation, determining the target frequency of a compressor of the refrigerating system, the rotating speed of a fan and the current of the semiconductor refrigerating device by using a preset second heat exchange model according to the indoor temperature and the set temperature;
and controlling the refrigerating system according to the determined target frequency of the compressor, the rotating speed of the fan and the current of the semiconductor refrigerating device.
7. The control method of a refrigeration system according to claim 6,
the first heat exchange model is used for obtaining the compressor frequency, the fan rotating speed and the current of the semiconductor refrigerating device under the shortest condition when the temperature reaches a set temperature;
and the second heat exchange model is used for obtaining the compressor frequency, the fan rotating speed and the current of the semiconductor refrigerating device under the condition of minimum system power consumption.
8. A control device for a refrigeration system according to any one of claims 1 to 5, comprising:
the comparison unit is used for comparing the temperature deviation of the indoor temperature and the set temperature with the set deviation when the refrigeration system is in a starting state;
the determining unit is used for determining the target frequency of a compressor of the refrigerating system, the rotating speed of a fan and the current of the semiconductor refrigerating device by utilizing a preset first heat exchange model according to the indoor temperature and the set temperature when the temperature deviation value is larger than the set deviation; when the temperature deviation value is smaller than or equal to a set deviation, determining the target frequency of a compressor of the refrigerating system, the rotating speed of a fan and the current of the semiconductor refrigerating device by using a preset second heat exchange model according to the indoor temperature and the set temperature;
and the control unit is used for controlling the refrigerating system according to the target frequency of the compressor, the rotating speed of the fan and the current of the semiconductor refrigerating device determined by the determination unit.
9. The control device of a refrigeration system according to claim 8,
the first heat exchange model is used for obtaining the compressor frequency, the fan rotating speed and the current of the semiconductor refrigerating device under the shortest condition when the temperature reaches a set temperature;
and the second heat exchange model is used for obtaining the compressor frequency, the fan rotating speed and the current of the semiconductor refrigerating device under the condition of minimum system power consumption.
10. A storage medium, having stored thereon a computer program which, when being executed by a processor, carries out the steps of the method of any one of claims 6 to 7.
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