CN110953759A - Magnetic refrigeration heat exchange system and control method thereof - Google Patents
Magnetic refrigeration heat exchange system and control method thereof Download PDFInfo
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- CN110953759A CN110953759A CN201911193071.7A CN201911193071A CN110953759A CN 110953759 A CN110953759 A CN 110953759A CN 201911193071 A CN201911193071 A CN 201911193071A CN 110953759 A CN110953759 A CN 110953759A
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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
- F25B21/00—Machines, plants or systems, using electric or magnetic effects
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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
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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
- F25B2321/00—Details of machines, plants or systems, using electric or magnetic effects
- F25B2321/002—Details of machines, plants or systems, using electric or magnetic effects by using magneto-caloric effects
- F25B2321/0022—Details of machines, plants or systems, using electric or magnetic effects by using magneto-caloric effects with a rotating or otherwise moving magnet
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
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Abstract
The invention provides a magnetic refrigeration heat exchange system and a control method thereof, wherein the magnetic refrigeration heat exchange system comprises a first magnetic refrigeration bed, a second magnetic refrigeration bed, a hot end heat exchange assembly, a cold end heat exchange assembly and a magnetizing medium, which are sequentially communicated to form a circulation loop, wherein the magnetizing medium is movably arranged between the first magnetic refrigeration bed and the second magnetic refrigeration bed so as to magnetize the first magnetic refrigeration bed or the second magnetic refrigeration bed; the flow sensor is communicated with the inlet end of the first magnetic refrigeration bed and is used for detecting the flow of fluid media flowing into the first magnetic refrigeration bed; the first temperature sensor is arranged corresponding to the hot-end heat exchange assembly and used for sensing the temperature of the hot-end heat exchange assembly; the second temperature sensor is arranged corresponding to the cold end heat exchange assembly and used for sensing the temperature of the cold end heat exchange assembly; the rotating speed of the magnetized medium and the flow of the fluid medium are adjusted according to the temperature values of the first temperature sensor and the second temperature sensor, and the problem that a magnetic refrigeration heat exchange system in the prior art is low in control accuracy is solved.
Description
Technical Field
The invention relates to the technical field of magnetic refrigeration, in particular to a magnetic refrigeration heat exchange system and a control method thereof.
Background
The magnetic refrigeration technology is a technology which applies the magnetocaloric effect of a magnetic material to the refrigeration field, wherein the magnetocaloric effect is an inherent property of the magnetic material, and changes the magnetic entropy of the material caused by the change of an external magnetic field and is accompanied with the processes of heat absorption and heat release of the material. For example, in the case of a ferromagnetic material, the magnetocaloric effect is most pronounced around its curie temperature (the temperature of the magnetic order-disorder transition), and when an external magnetic field is applied, the magnetic entropy of the material decreases and heat is released; conversely, when the external magnetic field is removed, the magnetic entropy value of the material rises and absorbs heat.
Magnetic refrigeration is a novel environment-friendly refrigeration technology. Compared with the traditional steam compression type refrigeration, the magnetic refrigeration adopts magnetic materials as the refrigeration working medium, has no destructive effect on the ozone layer and no greenhouse effect, the magnetic refrigeration technology is developed rapidly in recent years, and the development prospect is seen by experts of various countries; the magnetic refrigeration technology can be used for researching and developing refrigeration equipment such as a magnetic refrigeration air conditioner, a magnetic refrigeration refrigerator and the like, and can also be used for researching and developing a magnetic refrigeration heat pump. The performance indexes of products such as a magnetic refrigeration refrigerator, a magnetic refrigeration air conditioner and a magnetic refrigeration heat pump comprise: refrigeration (heating) temperature, energy consumption and time required for achieving stable operation. The larger the deviation between the stable temperature and the initial temperature in the refrigeration equipment is, the smaller the energy consumption is, the shorter the stable operation time is, and the better the performance of the magnetic refrigeration equipment is.
The physical quantities that have a large influence on the performance and can be adjusted in the magnetic refrigeration technology are as follows: the fluid flow rate, the magnet rotational speed, and these quantities have a large impact on the performance of the magnetic refrigeration product. Therefore, a set of accurate control device is provided in the magnetic refrigeration equipment, so that the magnet rotating speed and the system flow of the magnetic refrigeration equipment are kept at the optimal rotating speed for operation, the shorter the stable operation time of the magnetic refrigeration equipment is, the more important the energy consumption is, and the current method for accurately controlling the magnetic refrigeration heat exchange system is relatively lacked.
Disclosure of Invention
The invention mainly aims to provide a magnetic refrigeration heat exchange system and a control method thereof, and aims to solve the problem that the magnetic refrigeration heat exchange system in the prior art is low in control precision.
In order to achieve the above object, according to an aspect of the present invention, there is provided a magnetic refrigeration heat exchange system, including a first magnetic refrigeration bed, a second magnetic refrigeration bed, a hot end heat exchange assembly, and a cold end heat exchange assembly, which are sequentially connected to form a circulation loop, the magnetic refrigeration heat exchange system further including: the magnetizing medium is movably arranged between the first magnetic refrigeration bed and the second magnetic refrigeration bed so as to magnetize the first magnetic refrigeration bed or the second magnetic refrigeration bed; the flow sensor is communicated with the inlet end of the first magnetic refrigeration bed and used for detecting the flow of fluid media flowing into the first magnetic refrigeration bed; the first temperature sensor is arranged corresponding to the hot-end heat exchange assembly and used for sensing the temperature of the hot-end heat exchange assembly; the second temperature sensor is arranged corresponding to the cold end heat exchange assembly and used for sensing the temperature of the cold end heat exchange assembly; so as to adjust the rotating speed of the magnetized medium and the flow rate of the fluid medium according to the temperature values of the first temperature sensor and the second temperature sensor.
Further, the magnetic refrigeration heat exchange system also comprises; the control system, the magnetizing medium, the flow sensor, the first temperature sensor and the second temperature sensor are all connected with the control system.
Further, the magnetic refrigeration heat exchange system still includes: the outlet end of the medium pump is communicated with the inlet end of the first magnetic refrigeration bed and is used for conveying fluid medium for heat exchange into the first magnetic refrigeration bed, and the flow sensor is connected with the medium pump; the medium pump is connected with the control system.
Further, the magnetic refrigeration heat exchange system still includes: the first control valve is arranged on a pipeline between the outlet end of the medium pump and the inlet end of the first magnetic refrigeration bed so as to regulate the flow of the medium between the medium pump and the first magnetic refrigeration bed; the second control valve is arranged on a pipeline between the outlet end of the second magnetic refrigeration bed and the inlet end of the cold end heat exchange assembly, so that the flow of a medium between the second magnetic refrigeration bed and the cold end heat exchange assembly is regulated through the second control valve; the first control valve and the second control valve are both connected with the control system.
Further, the magnetic refrigeration heat exchange system still includes: the third control valve is arranged on a pipeline between the inlet end of the second magnetic refrigeration bed and the outlet end of the medium pump, so that the flow of the medium between the second magnetic refrigeration bed and the medium pump is regulated through the third control valve; the fourth control valve is arranged on a pipeline between the outlet end of the first magnetic refrigeration bed and the inlet end of the cold end heat exchange assembly, so that the flow of a medium between the first magnetic refrigeration bed and the cold end heat exchange assembly is regulated through the fourth control valve; and the third control valve and the fourth control valve are both connected with the control system.
Further, the magnetic refrigeration heat exchange system still includes: the first rotating speed controller is connected with the magnetizing medium so as to adjust the rotating speed of the magnetizing medium through the first rotating speed controller; the first speed controller is connected with the control system.
Further, the magnetic refrigeration heat exchange system also comprises; the second rotating speed controller is connected with the medium pump so as to adjust the rotating speed of the medium pump through the second rotating speed controller; the second rotating speed controller is connected with the control system.
Further, the magnetic refrigeration heat exchange system still includes: and the driving end of the driving part is in driving connection with the magnetized medium so as to drive the magnetized medium to rotate through the driving part.
According to another aspect of the invention, a control method of a magnetic refrigeration heat exchange system is provided, which is applicable to the magnetic refrigeration heat exchange system and comprises the steps of detecting the flow rate of a fluid medium in the system, detecting the temperature of a hot end heat exchange assembly of the magnetic refrigeration heat exchange system, detecting the temperature of a cold end heat exchange assembly of the magnetic refrigeration heat exchange system, and adjusting the rotating speed of a magnetic medium of the magnetic refrigeration heat exchange system and the flow rate of the fluid medium in the system according to the detected temperature of the hot end heat exchange assembly and the detected temperature of the cold end heat exchange assembly, wherein the detected temperature value is T', the temperature value set by a user is T1, and the preset deviation α is set in the control system.
Further, the magnetic refrigeration heat exchange system is the magnetic refrigeration heat exchange system, and the control method of the magnetic refrigeration heat exchange system further comprises the following steps: when the magnetic refrigeration heat exchange system is in a heating circulation mode, a first control valve and a second control valve of the magnetic refrigeration heat exchange system are controlled to be opened, and a third control valve and a fourth control valve are controlled to be closed; when the magnetic refrigeration heat exchange system is in a refrigeration cycle mode, the third control valve and the fourth control valve are controlled to be opened, and the first control valve and the second control valve are controlled to be closed.
Further, the method for adjusting the rotation speed of the magnetized medium and the flow rate of the fluid medium according to the detected temperature comprises the steps of executing a first setting program when the temperature is | T-T1 | > α, wherein the first setting program adjusts the rotation speed of the magnetized medium and the flow rate of the fluid medium based on the shortest running time of the system reaching stable running, and executing a second setting program when the temperature is | T-T1 | ≦ α, and wherein the second setting program adjusts the rotation speed of the magnetized medium and the flow rate of the fluid medium based on the minimum power standard consumed by the system running.
Further, the control method of the magnetic refrigeration heat exchange system further comprises the following steps: and setting a temperature value T ' detected by a preset temperature difference value delta T ' at a preset time delta T, and controlling the magnetized medium to operate at an initial rotating speed and controlling the flow of the fluid medium to be an initial flow value when T ' -T is +/-delta T.
By applying the technical scheme of the invention, the magnetic refrigeration heat exchange system comprises a first magnetic refrigeration bed, a second magnetic refrigeration bed, a hot end heat exchange assembly and a cold end heat exchange assembly which are sequentially communicated to form a circulation loop, wherein the magnetic refrigeration heat exchange system further comprises: the magnetic medium is movably arranged between the first magnetic refrigeration bed and the second magnetic refrigeration bed so as to magnetize the first magnetic refrigeration bed or the second magnetic refrigeration bed, the flow sensor is communicated with the inlet end of the first magnetic refrigeration bed and is used for detecting the flow of the fluid medium flowing into the first magnetic refrigeration bed, the first temperature sensor is arranged corresponding to the hot end heat exchange assembly and is used for sensing the temperature of the hot end heat exchange assembly, and the second temperature sensor is arranged corresponding to the cold end heat exchange assembly and is used for sensing the temperature of the cold end heat exchange assembly; so as to adjust the rotating speed of the magnetized medium and the flow rate of the fluid medium according to the temperature values of the first temperature sensor and the second temperature sensor. The magnetic refrigeration heat exchange system has a simple structure, is convenient to implement, can monitor the operation condition of the magnetic refrigeration heat exchange system in real time, and improves the control precision of the magnetic refrigeration heat exchange system.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, 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 shows a schematic structural diagram of an embodiment of a magnetic refrigeration heat exchange system according to the present invention;
FIG. 2 shows a first flow chart of a control method of a magnetic refrigeration heat exchange system according to the invention;
FIG. 3 shows a second flow chart of a control method of the magnetic refrigeration heat exchange system according to the present invention;
FIG. 4 shows a third flowchart of a control method of the magnetic refrigeration heat exchange system according to the present invention;
FIG. 5 shows a fourth flow chart of a control method of the magnetic refrigeration heat exchange system according to the present invention; .
Wherein the figures include the following reference numerals:
1. a first magnetic refrigeration bed; 2. a second magnetic refrigeration bed; 3. a hot end heat exchange assembly; 4. a cold end heat exchange assembly; 10. adding a magnetic medium; 20. a flow sensor; 30. a first temperature sensor; 40. a second temperature sensor; 5. a medium pump; 50. a first control valve; 60. a second control valve; 70. a third control valve; 80. a fourth control valve; 101. a first rotational speed controller; 501. a second rotational speed controller; 6. a drive member; 7. and (5) controlling the system.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The invention provides a magnetic refrigeration heat exchange system, please refer to fig. 1 to 5, comprising a first magnetic refrigeration bed 1, a second magnetic refrigeration bed 2, a hot end heat exchange assembly 3 and a cold end heat exchange assembly 4 which are sequentially communicated to form a circulation loop, the magnetic refrigeration heat exchange system further comprises: the magnetizing medium 10 is movably arranged between the first magnetic refrigeration bed 1 and the second magnetic refrigeration bed 2, so as to magnetize the first magnetic refrigeration bed 1 or the second magnetic refrigeration bed 2; the flow sensor 20 is communicated with the inlet end of the first magnetic refrigeration bed 1, and is used for detecting the flow of fluid media flowing into the first magnetic refrigeration bed 1; the first temperature sensor 30 is arranged corresponding to the hot-end heat exchange assembly 3 and used for sensing the temperature of the hot-end heat exchange assembly 3; the second temperature sensor 40 is arranged corresponding to the cold-end heat exchange assembly 4 and used for sensing the temperature of the cold-end heat exchange assembly 4; so as to adjust the rotation speed of the magnetized medium 10 and the flow rate of the fluid medium according to the temperature values of the first temperature sensor 30 and the second temperature sensor 40.
The magnetic refrigeration heat exchange system provided by the invention comprises a first magnetic refrigeration bed 1, a second magnetic refrigeration bed 2, a hot end heat exchange assembly 3 and a cold end heat exchange assembly 4 which are sequentially communicated to form a circulation loop, wherein the magnetic refrigeration heat exchange system further comprises: the magnetic medium adding device comprises a magnetic medium 10, a flow sensor 20, a first temperature sensor 30 and a second temperature sensor 40, wherein the magnetic medium 10 is movably arranged between a first magnetic refrigeration bed 1 and a second magnetic refrigeration bed 2 so as to add magnetism to the first magnetic refrigeration bed 1 or the second magnetic refrigeration bed 2, the flow sensor 20 is communicated with the inlet end of the first magnetic refrigeration bed 1 and is used for detecting the flow of a fluid medium flowing into the first magnetic refrigeration bed 1, the first temperature sensor 30 is arranged corresponding to a hot end heat exchange assembly 3 and is used for sensing the temperature of the hot end heat exchange assembly 3, and the second temperature sensor 40 is arranged corresponding to a cold end heat exchange assembly 4 and is used for sensing the temperature of the cold end heat exchange assembly 4; so as to adjust the rotation speed of the magnetized medium 10 and the flow rate of the fluid medium according to the temperature values of the first temperature sensor 30 and the second temperature sensor 40. The magnetic refrigeration heat exchange system has a simple structure, is convenient to implement, can monitor the operation condition of the magnetic refrigeration heat exchange system in real time, and improves the control precision of the magnetic refrigeration heat exchange system.
In specific implementation, the magnetic refrigeration heat exchange system further comprises; the control system 7, the magnetized medium 10, the flow sensor 20, the first temperature sensor 30 and the second temperature sensor 40 are all connected with the control system 7. The control system controls the rotation speed of the magnetized medium 10 and the flow rate of the medium in the system based on the detection results of the first temperature sensor 30 and the second temperature sensor 40.
Specifically, the magnetic refrigeration heat exchange system still includes: the outlet end of the medium pump 5 is communicated with the inlet end of the first magnetic refrigeration bed 1 and is used for conveying fluid medium for heat exchange into the first magnetic refrigeration bed 1, and the flow sensor 20 is connected with the medium pump 5; the medium pump 5 is connected to the control system. The medium pump 5 serves to pressurize the fluid medium while acting as a motive force for the fluid medium to flow in the system.
In order to facilitate the flow of the medium in the control system, the magnetic refrigeration heat exchange system further comprises: a first control valve 50, the first control valve 50 being disposed on the pipeline between the outlet end of the medium pump 5 and the inlet end of the first magnetic refrigeration bed 1 to regulate the flow rate of the medium between the medium pump 5 and the first magnetic refrigeration bed 1 through the first control valve 50; a second control valve 60, wherein the second control valve 60 is arranged on a pipeline between the outlet end of the second magnetic refrigeration bed 2 and the inlet end of the cold end heat exchange assembly 4, so as to regulate the flow of the medium between the second magnetic refrigeration bed 2 and the cold end heat exchange assembly 4 through the second control valve 60; the first control valve 50 and the second control valve 60 are both connected to the control system.
Further, the magnetic refrigeration heat exchange system still includes: a third control valve 70, the third control valve 70 being arranged on the pipeline between the inlet end of the second magnetic refrigeration bed 2 and the outlet end of the medium pump 5, so as to regulate the flow rate of the medium between the second magnetic refrigeration bed 2 and the medium pump 5 through the third control valve 70; the fourth control valve 80, the fourth control valve 80 is arranged on the pipeline between the outlet end of the first magnetic refrigeration bed 1 and the inlet end of the cold end heat exchange assembly 4, so as to regulate the flow of the medium between the first magnetic refrigeration bed 1 and the cold end heat exchange assembly 4 through the fourth control valve 80; the third control valve 70 and the fourth control valve 80 are both connected to the control system.
In an embodiment provided by the present invention, the magnetic refrigeration heat exchange system further includes: a first rotation speed controller 101, wherein the first rotation speed controller 101 is connected with the magnetizing medium 10 so as to adjust the rotation speed of the magnetizing medium 10 through the first rotation speed controller 101; the first rotational speed controller 101 is connected to the control system.
The magnetic refrigeration heat exchange system further comprises: a second rotational speed controller 501, the second rotational speed controller 501 being connected to the medium pump 5 to adjust the rotational speed of the medium pump 5 by the second rotational speed controller 501; the second rotational speed controller 501 is connected to the control system 7.
The magnetic refrigeration heat exchange system further comprises: and the driving end of the driving part 6 is in driving connection with the magnetized medium 10, so that the magnetized medium 10 is driven to rotate by the driving part 6.
The invention also provides a control method of the magnetic refrigeration heat exchange system, which is suitable for the magnetic refrigeration heat exchange system of the embodiment and comprises the steps of detecting the flow of a fluid medium in the system, detecting the temperature of a hot end heat exchange assembly of the magnetic refrigeration heat exchange system, detecting the temperature of a cold end heat exchange assembly of the magnetic refrigeration heat exchange system, and adjusting the rotating speed of a magnetized medium 10 of the magnetic refrigeration heat exchange system and the flow of the fluid medium in the system according to the detected temperature of the hot end heat exchange assembly and the detected temperature of the cold end heat exchange assembly, wherein the detected temperature value is T', the temperature value set by a user is T1, and the preset deviation α is set in the control system.
The control method of the magnetic refrigeration heat exchange system further comprises the following steps: when the magnetic refrigeration heat exchange system is in a heating circulation mode, controlling the first control valve 50 and the second control valve 60 of the magnetic refrigeration heat exchange system to be opened, and controlling the third control valve 70 and the fourth control valve 80 to be closed; when the magnetic refrigeration heat exchange system is in the refrigeration cycle mode, the third control valve 70 and the fourth control valve 80 are controlled to be opened, and the first control valve 50 and the second control valve 60 are controlled to be closed.
The method for regulating the rotating speed of the magnetized medium and the flow rate of the fluid medium according to the detected temperature comprises the steps of executing a first setting program when the temperature is | T-T1 | α, wherein the first setting program regulates the rotating speed of the magnetized medium and the flow rate of the fluid medium by taking the shortest running time of the system reaching stable running as a standard, and executing a second setting program when the temperature is | T-T1 | ≦ α, and the second setting program regulates the rotating speed of the magnetized medium and the flow rate of the fluid medium by taking the minimum power consumed by the running of the system as a standard.
The control method of the magnetic refrigeration heat exchange system further comprises the following steps: and setting a temperature value T ' detected by a preset temperature difference value delta T ' at a preset time delta T, and controlling the magnetized medium 10 to operate at an initial rotating speed and controlling the flow of the fluid medium to be an initial flow value when T ' -T is +/-delta T.
The heat exchange model comprises:
ε is the porosity, TS is the temperature of the magnetized medium, Tf is the temperature of the fluid; rho s and Cs are the density and specific heat capacity of the magnetizing medium, rho f and Cf are the density and specific heat capacity of the fluid, h is the convective heat transfer coefficient, AHT is the total area of the magnetizing medium, r is the radius of the cold accumulation bed, theta is the radian of the cold accumulation bed, V is the volume of the cold accumulation bed, lambda f is the thermal conductivity of the fluid, and lambda s is the thermal conductivity of the fluid;
solving the power P and the stable operation time t by the equation (1) and the equation (2), wherein the stable operation time is the operation time when the variation range of the indoor temperature reaches +/-0.2 ℃ in the preset time interval; for example, at the first time t1, the room temperature is Tw, and at the second time t2, the room temperature is Tm, and when Tm-Tw ═ 0.2 ℃, it is confirmed that the system has reached a stable operation.
The first setting program takes the stable operation time t as the optimization model of the target, namely the target function is the stable operation time t, and the limiting condition is that the power P is not more than b (b is a constant value)
c (c is a constant value) is more than or equal to the rotating speed w is less than or equal to d (d is a constant value)
e (e is constant) is less than or equal to the flow L is less than or equal to f (f is constant)
The second setting program is an optimization model taking the system power P as a target, namely the target function is the power P, and the limiting condition is that the time t is less than or equal to g (g is a constant value)
c (c is a constant value) is more than or equal to the rotating speed w is less than or equal to d (d is a constant value)
e (e is constant) is less than or equal to the flow L is less than or equal to f (f is constant)
In an embodiment of the present invention, as shown in fig. 2, a magnetic cooling heat exchange system is turned on, a cooling mode or a heating mode is set, an indoor temperature T' is detected as a user-set temperature T1, when | -T1 | > α, a first setting procedure is performed, an indoor temperature value is detected every predetermined time Δ T1 and compared with a previous indoor temperature value, if the comparison result is within a predetermined temperature difference range, the indoor temperature value is stable, at this time, the indoor temperature value is compared with the user-set temperature value, if the indoor temperature is unstable, the rotation speed of the magnetic medium and the flow rate of the fluid medium are controlled to be constant, when | -T634 ≦ 8295, a second predetermined procedure is performed, an indoor temperature value is detected every predetermined time Δ T2, the detected temperature value is compared with the user-set temperature value, when it is not stable, the indoor temperature is determined to be unstable, the indoor temperature value is interfered by other indoor temperatures or human body temperatures, after the initial temperature detection of the cooling mode is completed, the indoor temperature detected includes indoor temperature or other indoor temperatures, that is not lower than the user-set temperature, when it is determined that the magnetic cooling mode, the indoor temperature T364 is not less than T4834, and the second predetermined time, the magnetic load is determined to be equal to the predetermined time T3625, when the indoor temperature T364-T364 — T3625.
In a second embodiment of the present invention, as shown in fig. 3, a magnetic cooling heat exchange system is turned on to set a cooling mode or a heating mode, a user-set temperature T1 of an indoor temperature T' is detected, when | T-T1 | α, a first setting procedure is performed, a temperature value in the indoor is detected every predetermined time Δ T1, and then the detected temperature value is compared with the user-set temperature value, when | T-T1 | or α, a second setting procedure is performed, a temperature value in the indoor is detected every predetermined time Δ T2, and the detected temperature value is compared with the user-set temperature value, when it is necessary to describe herein, since the temperature in the indoor is interfered by other electric appliances or human body temperatures in the indoor, after the initial temperature detection in the cooling mode is completed, the detected indoor temperature includes temperatures emitted from other electric appliances or human bodies in the indoor, i.e., a thermal load, as shown in fig. 5, when it is determined that the number of times of the second predetermined procedure T-T1 | is not less than twice, and the magnetic load of the rotating speed T1 is not equal to the magnetic cooling mode plus the magnetic flux of the T α.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
the magnetic refrigeration heat exchange system provided by the invention comprises a first magnetic refrigeration bed 1, a second magnetic refrigeration bed 2, a hot end heat exchange assembly 3 and a cold end heat exchange assembly 4 which are sequentially communicated to form a circulation loop, wherein the magnetic refrigeration heat exchange system further comprises: the magnetic adding medium 10 is arranged on the outer side of the first magnetic refrigeration bed 1, the magnetic adding medium 10 is movably arranged between the first magnetic refrigeration bed 1 and the second magnetic refrigeration bed 2 so as to add magnetism to the first magnetic refrigeration bed 1 or the second magnetic refrigeration bed 2, the flow sensor 20 is communicated with the inlet end of the first magnetic refrigeration bed 1 and is used for detecting the flow of the fluid medium flowing into the first magnetic refrigeration bed 1, the first temperature sensor 30 is arranged corresponding to the hot-end heat exchange assembly 3 and is used for sensing the temperature of the hot-end heat exchange assembly 3, and the second temperature sensor 40 is arranged corresponding to the cold-end heat exchange assembly 4 and is used for sensing the temperature of the cold-end heat exchange assembly 4; so as to adjust the rotation speed of the magnetized medium 10 and the flow rate of the fluid medium according to the temperature values of the first temperature sensor 30 and the second temperature sensor 40. The magnetic refrigeration heat exchange system has a simple structure, is convenient to implement, can monitor the operation condition of the magnetic refrigeration heat exchange system in real time, and improves the control precision of the magnetic refrigeration heat exchange system.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. The utility model provides a magnetism refrigeration heat transfer system, includes first magnetism refrigeration bed (1), second magnetism refrigeration bed (2), hot junction heat transfer subassembly (3) and cold junction heat transfer subassembly (4) that communicate in proper order in order to constitute circulation circuit, its characterized in that, magnetism refrigeration heat transfer system still includes:
the magnetizing medium (10) is movably arranged between the first magnetic refrigeration bed (1) and the second magnetic refrigeration bed (2) so as to magnetize the first magnetic refrigeration bed (1) or the second magnetic refrigeration bed (2);
the flow sensor (20), the flow sensor (20) is communicated with the inlet end of the first magnetic refrigeration bed (1) and is used for detecting the flow of the fluid medium flowing into the first magnetic refrigeration bed (1);
the first temperature sensor (30) is arranged corresponding to the hot end heat exchange assembly (3) and used for sensing the temperature of the hot end heat exchange assembly (3);
the second temperature sensor (40) is arranged corresponding to the cold end heat exchange assembly (4) and used for sensing the temperature of the cold end heat exchange assembly (4); so as to adjust the rotation speed of the magnetized medium (10) and the flow rate of the fluid medium according to the temperature values of the first temperature sensor (30) and the second temperature sensor (40).
2. The magnetic refrigeration heat exchange system of claim 1 further comprising;
and the magnetizing medium (10), the flow sensor (20), the first temperature sensor (30) and the second temperature sensor (40) are all connected with the control system (7).
3. The magnetic refrigeration heat exchange system of claim 1 further comprising:
the outlet end of the medium pump (5) is communicated with the inlet end of the first magnetic refrigeration bed (1) and is used for conveying fluid medium for heat exchange into the first magnetic refrigeration bed (1), and the flow sensor (20) is connected with the medium pump (5);
the medium pump (5) is connected to the control system.
4. The magnetic refrigeration heat exchange system of claim 3 further comprising:
a first control valve (50), the first control valve (50) being arranged on a pipeline between an outlet end of the medium pump (5) and an inlet end of the first magnetic refrigeration bed (1) to regulate a flow rate of the medium between the medium pump (5) and the first magnetic refrigeration bed (1) through the first control valve (50);
a second control valve (60), wherein the second control valve (60) is arranged on a pipeline between the outlet end of the second magnetic refrigeration bed (2) and the inlet end of the cold end heat exchange assembly (4) so as to adjust the flow rate of the medium between the second magnetic refrigeration bed (2) and the cold end heat exchange assembly (4) through the second control valve (60);
the first control valve (50) and the second control valve (60) are both connected with the control system.
5. The magnetic refrigeration heat exchange system of claim 4 further comprising:
a third control valve (70), the third control valve (70) being arranged on the pipeline between the inlet end of the second magnetic refrigeration bed (2) and the outlet end of the medium pump (5) to regulate the flow of the medium between the second magnetic refrigeration bed (2) and the medium pump (5) through the third control valve (70);
a fourth control valve (80), wherein the fourth control valve (80) is arranged on a pipeline between the outlet end of the first magnetic refrigeration bed (1) and the inlet end of the cold end heat exchange assembly (4) so as to adjust the flow rate of the medium between the first magnetic refrigeration bed (1) and the cold end heat exchange assembly (4) through the fourth control valve (80);
the third control valve (70) and the fourth control valve (80) are both connected to the control system.
6. The magnetic refrigeration heat exchange system according to any one of claims 1 to 5, further comprising:
a first speed controller (101), wherein the first speed controller (101) is connected with the magnetizing medium (10) so as to adjust the speed of the magnetizing medium (10) through the first speed controller (101); the first speed controller (101) is connected with the control system.
7. The magnetic refrigeration heat exchange system according to any one of claims 3 to 5, further comprising;
a second rotational speed controller (501), wherein the second rotational speed controller (501) is connected to the medium pump (5) in order to set the rotational speed of the medium pump (5) by means of the second rotational speed controller (501);
the second rotational speed controller (501) is connected with the control system (7).
8. The magnetic refrigeration heat exchange system of claim 1 further comprising:
the driving end of the driving part (6) is in driving connection with the magnetized medium (10) so as to drive the magnetized medium (10) to rotate through the driving part (6).
9. A control method of a magnetic refrigeration heat exchange system, which is applied to the magnetic refrigeration heat exchange system of any one of claims 1 to 8, and is characterized by comprising the following steps:
detecting the flow rate of a fluid medium in the system;
detecting the temperature of a hot-end heat exchange assembly of the magnetic refrigeration heat exchange system;
detecting the temperature of a cold end heat exchange assembly of the magnetic refrigeration heat exchange system;
according to the detected temperature of the hot end heat exchange assembly and the detected temperature of the cold end heat exchange assembly, the rotating speed of a magnetized medium (10) of the magnetic refrigeration heat exchange system and the flow of a fluid medium in the system are adjusted;
wherein, the measured temperature value is T', the temperature value set by the user is T1, and the control system is internally provided with a preset deviation α.
10. The control method of a magnetic refrigeration heat exchange system according to claim 9, wherein the magnetic refrigeration heat exchange system is the magnetic refrigeration heat exchange system according to claim 5, and the control method of the magnetic refrigeration heat exchange system further comprises:
when the magnetic refrigeration heat exchange system is in a heating circulation mode, controlling a first control valve (50) and a second control valve (60) of the magnetic refrigeration heat exchange system to be opened, and controlling a third control valve (70) and a fourth control valve (80) to be closed;
when the magnetic refrigeration heat exchange system is in a refrigeration cycle mode, the third control valve (70) and the fourth control valve (80) are controlled to be opened, and the first control valve (50) and the second control valve (60) are controlled to be closed.
11. The control method of the magnetic refrigeration heat exchange system according to claim 9, wherein the method of adjusting the rotation speed of the magnetized medium and the flow rate of the fluid medium according to the detected temperature comprises:
when the T-T1 | > α, executing a first setting program, wherein the first setting program takes the shortest operation time of the system reaching stable operation as a standard, and adjusts the rotating speed of the magnetized medium and the flow rate of the fluid medium;
and when the T-T1 |. is not more than α, executing a second setting program, wherein the second setting program takes the minimum power consumed by the system operation as a standard and adjusts the rotating speed of the magnetized medium and the flow rate of the fluid medium.
12. The control method of the magnetic refrigeration heat exchange system according to claim 9, further comprising:
and setting a temperature value T ' detected at a preset time delta T interval by a preset temperature difference delta T ', and controlling the magnetizing medium (10) to operate at an initial rotating speed and controlling the flow of the fluid medium to be an initial flow value when T ' -T is +/-delta T.
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