CN111447809B - Photovoltaic air conditioner, cooling assembly and control method of cooling assembly - Google Patents
Photovoltaic air conditioner, cooling assembly and control method of cooling assembly Download PDFInfo
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- CN111447809B CN111447809B CN202010400675.0A CN202010400675A CN111447809B CN 111447809 B CN111447809 B CN 111447809B CN 202010400675 A CN202010400675 A CN 202010400675A CN 111447809 B CN111447809 B CN 111447809B
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- 238000001816 cooling Methods 0.000 title claims abstract description 350
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000003507 refrigerant Substances 0.000 claims abstract description 71
- 238000010438 heat treatment Methods 0.000 claims abstract description 66
- 230000017525 heat dissipation Effects 0.000 claims description 44
- 238000010248 power generation Methods 0.000 claims description 37
- 230000007613 environmental effect Effects 0.000 claims description 21
- 238000005192 partition Methods 0.000 claims description 19
- 230000002596 correlated effect Effects 0.000 claims description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 20
- 230000000694 effects Effects 0.000 abstract description 15
- 239000003570 air Substances 0.000 description 39
- 230000000875 corresponding effect Effects 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 8
- 230000001276 controlling effect Effects 0.000 description 7
- 239000002826 coolant Substances 0.000 description 6
- 238000005265 energy consumption Methods 0.000 description 6
- 238000005057 refrigeration Methods 0.000 description 5
- 230000002349 favourable effect Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 239000012080 ambient air Substances 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- 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
-
- 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
-
- 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
- F24F5/0046—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 using natural energy, e.g. solar energy, energy from the ground
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
- H05K7/20909—Forced ventilation, e.g. on heat dissipaters coupled to components
-
- 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
- F24F5/0046—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 using natural energy, e.g. solar energy, energy from the ground
- F24F2005/0064—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 using natural energy, e.g. solar energy, energy from the ground using solar energy
- F24F2005/0067—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 using natural energy, e.g. solar energy, energy from the ground using solar energy with photovoltaic panels
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Life Sciences & Earth Sciences (AREA)
- Thermal Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Power Engineering (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Inverter Devices (AREA)
Abstract
The invention relates to the technical field of cooling, and provides a photovoltaic air conditioner, a cooling assembly and a control method thereof. The cooling assembly comprises a refrigerant cooling piece and a thermoelectric cooling piece, the refrigerant cooling piece is provided with a refrigerant inlet and a refrigerant outlet, the thermoelectric cooling piece comprises a device cooling piece, the device cooling piece is provided with a first cold end and a first hot end, and the first cold end exchanges heat with the refrigerant cooling piece. The cooling component of the embodiment is suitable for occasions with both the heat pump unit and the direct current power supply, and can cool the heating device no matter whether the heat pump unit normally operates or not, so that the continuous cooling of the heating device is kept good; in addition, the thermoelectric cooling piece has the advantages of simple structure, simple and convenient control, good cooling effect, small occupied space and compact structure, and is beneficial to the cooling assembly; in addition, it is advantageous to ensure that the heat generating device can be cooled well when only the refrigerant cooling member is operated, and that the heat generating device can be cooled well when only the device cooling member is operated.
Description
Technical Field
The invention relates to the technical field of cooling, in particular to a photovoltaic air conditioner, a cooling assembly and a control method thereof.
Background
The existing air conditioner generally adopts a refrigerant to cool each heating device, and the refrigerant cooling has the advantages of good cooling effect, low energy consumption and the like.
However, in the photovoltaic air conditioner, a state may occur in which the heat pump unit is turned off and the photovoltaic power generation module is turned on, and in this state, the heat generating device such as the inverter cannot be cooled by the refrigerant.
And when the photovoltaic air conditioner is started up in a high-temperature environment, before the heat pump unit and the photovoltaic power generation module do not normally operate, the frequency converter possibly has higher temperature under the influence of the environment temperature, the temperature rising allowance of the frequency converter is smaller at the moment, if the frequency converter is cooled by adopting a refrigerant after waiting for the normal operation of the heat pump unit, the frequency converter possibly has overheat phenomenon due to untimely cooling, and the performance of the frequency converter is reduced.
Semiconductor refrigeration is a refrigeration mode utilizing thermoelectric refrigeration effect, and is therefore also called thermoelectric refrigeration or thermoelectric refrigeration. The basic element of the thermoelectric refrigerating element is a thermocouple pair, namely a thermocouple formed by connecting a P-type semiconductor element and an N-type semiconductor element, and the thermoelectric refrigerating element has the advantages of simple structure, convenience in control and the like.
Disclosure of Invention
One of the purposes of the invention is to provide a cooling component which has low energy consumption, simple structure, good cooling effect on a heating device and is convenient for continuously cooling the heating device.
In order to achieve the above object, the cooling assembly provided by the invention comprises a refrigerant cooling piece and a thermoelectric cooling piece, wherein the refrigerant cooling piece is provided with a refrigerant inlet and a refrigerant outlet, the thermoelectric cooling piece comprises a device cooling piece, the device cooling piece is provided with a first cold end and a first hot end, and the first cold end exchanges heat with the refrigerant cooling piece.
Therefore, the cooling assembly is suitable for occasions with both the heat pump unit and the direct current power supply, and the cooling assembly can cool the heating device no matter whether the heat pump unit normally operates or not by the structural design of the cooling assembly, so that the continuous cooling of the heating device is kept good; in addition, the thermoelectric cooling piece has simple structure, simple and convenient control, good cooling effect and small occupied space, and is beneficial to compact structure of the cooling assembly; in addition, because the first cold junction exchanges heat with the refrigerant cooling piece, the device cooling piece is used for cooling the refrigerant cooling piece and then indirectly cooling the heating device, so that the core cooling area of the heating device is fully covered by the refrigerant cooling piece, the heating device can be well cooled when only the refrigerant cooling piece operates, and the heating device can be well cooled when only the device cooling piece operates.
The cooling device comprises a cooling device, a cooling medium cooling part, a first cold end, a cooling area, a heat dissipation area and a heat dissipation area.
From the above, the arrangement of the partition plate is beneficial to reducing the heat exchange between the cooling area and the heat dissipation area, and is beneficial to avoiding the heat end of the thermoelectric cooling piece and the heat exchanger of the cooling area.
Further, the cooling area is an enclosed space.
Therefore, the temperature change of the cooling area is not easily influenced by external air flow, which is beneficial to accurately controlling the ambient temperature of the cooling area and the temperature of the heating device in the cooling area and is beneficial to keeping the stability of temperature control.
The heat dissipation area is further provided with a first fan, and the first fan blows air flow of the heat dissipation area.
From the above, the arrangement of the first fan is beneficial to the accelerated heat dissipation of the first hot end and the improvement of the cooling effect of the thermoelectric cooling element.
The thermoelectric cooling piece further comprises an environmental cooling piece, the environmental cooling piece is fixedly connected with the partition plate, the environmental cooling piece is provided with a second cold end and a second hot end, the second cold end is suspended in the cooling area, and the second hot end is located in the heat dissipation area.
Therefore, the environment temperature of the heating device is kept in a set temperature range, the heat exchange rate of the heating device and the environment air is conveniently increased, and the heating device is further well cooled.
In a further embodiment, the cooling zone is provided with a second fan, which blows an air flow of the cooling zone.
From the above, the arrangement of the second fan is beneficial to the accelerated heat dissipation of the second cold end and the ambient air of the cooling area, is beneficial to the reduction of the ambient temperature of the heating device, and is beneficial to the formation of an immersive cooling effect on the heating device.
Still further, the device cooling element is independently controlled from the ambient cooling element.
In another preferred embodiment, the component cooling elements have at least two groups, each group having at least one component cooling element, each group of component cooling elements being independently controllable.
Therefore, the cooling quantity of the device cooling piece to the heating device can be conveniently adjusted by controlling the opening group number of the device cooling piece, and the control is convenient.
In a further preferred embodiment, the first cold end is attached to the surface of the coolant-cooled member.
The second purpose of the invention is to provide a photovoltaic air conditioner which has less cooling energy consumption and compact structure, and is favorable for keeping the running state continuously and well.
In order to achieve the above purpose, the photovoltaic air conditioner provided by the invention comprises a photovoltaic power generation module, a heat pump unit, a heating device and the cooling assembly, wherein the refrigerant cooling part is arranged at the heating device, the heat pump unit supplies refrigerant to the refrigerant cooling part, and the first cold end is positioned at one side of the refrigerant cooling part, which is opposite to the heating device.
The heating device comprises a frequency converter, wherein the frequency converter is provided with a rectifying module, an inversion module and a direct current bus, the direct current bus is connected between the rectifying module and the inversion module, the photovoltaic power generation module is electrically connected with the direct current bus, and the thermoelectric cooling piece is electrically connected with the direct current bus.
Therefore, the thermoelectric cooling piece can be powered by only starting the photovoltaic air conditioner, the power consumption requirement of the thermoelectric cooling piece can be guaranteed no matter what state the heat pump unit and the photovoltaic power generation module are in, and the frequency converter can be well cooled.
The invention further aims to provide the photovoltaic air conditioner which is low in cooling energy consumption, compact in structure and favorable for keeping the running state continuously.
In order to achieve the above purpose, the photovoltaic air conditioner provided by the invention comprises a photovoltaic power generation module, a heating device, a refrigerant cooling piece and a thermoelectric cooling piece, wherein the thermoelectric cooling piece comprises a third piece, the third piece is provided with a third hot end and a third cold end, the third cold end and the thermoelectric cooling piece are both arranged at the heating device, and the third cold end and the thermoelectric cooling piece act on different positions of the heating device.
The third object of the invention is to provide a control method of the cooling assembly, which has the advantages of low energy consumption, simple structure, good cooling effect on the heating device and convenience for continuously cooling the heating device, wherein the cooling medium cooling piece is supplied with cooling medium by the heat pump unit, and the device cooling piece is started when the heating device is determined to be required to be cooled and the heat pump unit is determined to be in a shutdown state.
In a preferred embodiment, the device cooling element is turned on when it is determined that the heat pump unit is in an on state and the temperature of the heat generating device is higher than a preset first temperature.
Another preferable scheme is that the heat dissipation state is determined according to the operation state of the heat pump unit, or the heat dissipation state is determined according to the operation state of the heat pump unit and the operation state of the heating device, and under the condition of the same heat dissipation state: the current of the device cooling piece is positively correlated with the temperature of the heating device; or the device cooling member has at least two, and the number of the device cooling members to be turned on is positively correlated with the temperature of the heat generating device.
From the above, the heat pump unit has two states of on and off, and the limitation is satisfied when the heat pump unit is in one of the states; in this way, the cooling capacity of the device cooling element is favorably matched with the cooling requirement of the heat generating device, and it should be noted that the positive correlation is in terms of overall trend, so long as the positive correlation between the current of the device cooling element and the overall trend of the temperature of the heat generating device is satisfied, and the adjustment of the device cooling element can be stepless adjustment within the protection scope of the present invention, for example: the current of the device cooling piece is regulated in real time along with the temperature of the heating device; (2) adjustment of the device cooling element may also be a stepwise adjustment: the device cooling piece is provided with a plurality of current gears, the current gears of the device cooling piece are adjusted according to the temperature of the heating device, different current gears of the device cooling piece correspond to different temperature ranges of the heating device, the value of the temperature range of the heating device corresponding to the gear with larger current is also higher, the integral trend of the current of the device cooling piece and the temperature of the heating device is regarded as positive correlation at the moment, and the current of the device cooling piece can be kept unchanged in the same gear when the temperature of the heating device is changed less.
Drawings
FIG. 1 is a schematic cross-sectional view of a portion of the structure of a photovoltaic air conditioner embodiment of the present invention;
FIG. 2 is a control flow diagram of a device cooling member in an embodiment of the control method of the present invention.
Detailed Description
Cooling assembly embodiment:
the cooling module of the present embodiment is suitable for applications where there is both a heat pump unit and a dc power source (for example, a dc bus described below), for example, the cooling module of the present embodiment is applied to a photovoltaic air conditioner described below.
Referring to fig. 1, the cooling assembly of the present embodiment includes a refrigerant cooling member 2, a thermoelectric cooling member, a first fan 5, a second fan 6, and a partition 7, the refrigerant cooling member 2 is a plate, the refrigerant cooling member 2 has a refrigerant inlet and a refrigerant outlet (not shown in the drawing), the heat pump unit introduces a refrigerant into the refrigerant cooling member 2 through the refrigerant inlet and the refrigerant outlet, and the refrigerant cooling member 2 is attached to a surface of a heat generating device (for example, a frequency converter 1 described below).
The space on one side of the partition plate 7 is a cooling area 81, the space on the other side of the partition plate 7 is a heat dissipation area 82, a heating device is arranged in the cooling area 81, the thermoelectric cooling piece is fixedly connected with the partition plate 7, in particular, the partition plate 7 is provided with an opening, the opening is communicated with the cooling area 81 and the heat dissipation area 82, the edge of the opening is provided with a folded edge, the folded edge is fixedly connected with the thermoelectric cooling piece, the arrangement of the folded edge is beneficial to increasing the contact area between the thermoelectric cooling piece and the partition plate 7, and the connection strength and stability of the partition plate 7 and the thermoelectric cooling piece are beneficial to being improved.
The thermoelectric cooling piece is electrically connected with a direct current power supply, the thermoelectric cooling piece is powered by the direct current power supply, the thermoelectric cooling piece comprises a device cooling piece 3 and an environment cooling piece 4, the device cooling piece 3 comprises a first hot end 32 and a first cold end 31, the first cold end 31 is located in a cooling area 81, the first cold end 31 is attached to one side, facing away from a heating device, of the refrigerant cooling piece 2, and the first hot end 32 is located in a heat dissipation area 82.
The ambient cooling element 4 comprises a second hot end 42 and a second cold end 41, the second cold end 41 is overhanging the cooling zone 81, and the second hot end 42 is located in the heat dissipation zone 82.
The first fan 5 is disposed in the heat dissipation area 82, and the first fan 5 blows air around the first hot end 32 and the second hot end 42, for example, the blowing direction of the first fan 5 faces the first hot end 32 and the second hot end 42, which is favorable for accelerating heat exchange between the first hot end 32 and air, accelerating heat exchange rate between the first hot end 32 and ambient air, accelerating heat dissipation of the first hot end 32, and accelerating heat dissipation of the second hot end 42.
The second fan 6 is disposed in the cooling area 81, and the second fan 6 blows air around the second cold end 41, for example, the blowing direction of the second fan 6 is away from the second cold end 41, which is beneficial to accelerating the heat exchange rate between the second cold end 41 and the air in the cooling area 81, and is beneficial to cooling the air in the cooling area 81, and then is beneficial to forming an immersed cooling effect on the heating device.
When the heat pump unit is in operation, the heat pump unit supplies a refrigerant to the refrigerant cooling piece 2, the refrigerant cooling piece 2 can cool a heating device, the energy consumption for cooling the heating device is reduced, when the heat pump unit is not in operation, a direct-current power supply can be adopted to supply power to the device cooling piece 3, the device cooling piece 3 is used for cooling the heating device, thus the cooling of the heating device is not influenced by the operation state of the heat pump unit, the continuous maintenance of the good cooling effect of the heating device is facilitated, the structure of the thermoelectric cooling piece is simple, the control is simple and convenient, the cooling effect is good, and the occupied space of the thermoelectric cooling piece is small; in addition, because the device cooling piece 3 is attached to the surface of the refrigerant cooling piece 2, the device cooling piece 3 indirectly cools the heating device through cooling the refrigerant cooling piece 2, so that the core heating area of the heating device is fully covered by the refrigerant cooling piece 2, and the heating device can be well cooled when only the refrigerant cooling piece 2 and only the device cooling piece 3 are operated.
In this embodiment, the cooling medium cooling part 2 and the device cooling part 3 cool the heat generating device, so as to ensure that the heat generating device operates in a set temperature interval, however, the coverage area of the cooling medium cooling part 2 and the device cooling part 3 for the heat generating device is limited, and the cooling medium cooling part 2 and the device cooling part cannot cool all areas of the heat generating device, so that the environmental cooling part 4 is also used for cooling the environmental air in the cooling area 81 of the heat generating device, so that the air in the environmental space of the heat generating device is kept in the set temperature interval, the heat exchange rate between the heat generating device and the environmental air is conveniently accelerated, and the cooling of the heat generating device is further ensured to be good.
Preferably, the device cooling element 3 is connected in parallel with the ambient cooling element 4, which facilitates the separate control of the device cooling element 3 and the ambient cooling element 4, and facilitates the control of the thermoelectric cooling element.
Optionally, the cooling component of the invention can also be used in a vehicle-mounted system, the refrigerant cooling piece 2 is supplied with refrigerant by a vehicle-mounted heat pump unit, the thermoelectric cooling piece is supplied with power by a vehicle-mounted generator or a vehicle-mounted battery, when the vehicle-mounted heat pump unit operates, the refrigerant cooling piece 2 is preferably adopted to cool the heating device, when the vehicle-mounted heat pump unit is shut down, the device cooling piece 3 is adopted to cool the heating device, and the environment cooling piece 4 is adopted to cool the environment air of the heating device, so that the purpose of continuously and well cooling the heating device can be realized.
Photovoltaic air conditioner embodiment:
referring to fig. 1, the photovoltaic air conditioner of the present embodiment includes a heat pump unit (not shown), a photovoltaic power generation module (not shown), the cooling assembly, the frequency converter 1 and the frequency converter box 8, wherein the frequency converter 1 is easy to generate more heat during operation, so that the temperature of the frequency converter 1 is relatively high, the temperature of the frequency converter 1 is too high to easily influence the normal performance, the frequency converter 1 of the present embodiment is a heat generating device, and the refrigerant cooling member 2 is attached to the surface of the frequency converter 1.
Alternatively, other heat generating devices of the photovoltaic air conditioner can be cooled by using a cooling assembly.
The baffle 7 is positioned in the frequency conversion box 8, the baffle 7 separates a relatively independent cooling area 81 and a heat dissipation area 82 in the inner space of the frequency conversion box 8, the frequency converter 1 is arranged in the cooling area 81, and sealing treatment is carried out between the baffle 7 and the frequency conversion box 8 so as to reduce heat exchange between the cooling area 81 and the heat dissipation area 82 as much as possible.
Specifically, the frequency conversion box 8 has a first heat dissipation window and a second heat dissipation window (not shown in the figure), the first heat dissipation window is communicated with the cooling area 81 and the external environment, the second heat dissipation window is communicated with the heat dissipation area 82 and the external environment, the arrangement of the heat dissipation windows is beneficial to the airflow flowing in the frequency conversion box 8, the heat dissipation of the frequency converter 1 is beneficial, the first heat dissipation window is preferably covered by a filter screen, the second heat dissipation window is preferably covered by a filter screen, and thus the invasion of external sundries into the frequency conversion box 8 is beneficial to be avoided.
Alternatively, in other embodiments of the present invention, the cooling area 81 may be an enclosed space, which is beneficial to reduce the influence of the environment outside the frequency conversion box 8 and the temperature of the heat dissipation area 82 on the cooling area 81, so as to facilitate stable control of the environment temperature of the frequency converter 1 and the cooling area 81 in the cooling area 81.
The frequency converter 1 is provided with a rectifying module (not shown in the figure), an inversion module (not shown in the figure) and a direct current bus (not shown in the figure), the mains supply is connected to the rectifying module, the rectifying module rectifies the mains supply into direct current and conducts the direct current to the inversion module through the direct current bus, the direct current is converted into alternating current through the inversion module and then is supplied to the heat pump unit for use, the direct current generated by the photovoltaic power generation module is integrated into the direct current bus between the rectifying module and the inversion module, and the thermoelectric cooling piece is powered by the direct current bus.
The photovoltaic air conditioner mainly comprises the following three states after being started, wherein the first state is as follows: the heat pump unit and the photovoltaic power generation module are both operated normally; second state: the photovoltaic power generation module normally operates, and the heat pump unit does not operate; third state: the heat pump unit and the photovoltaic power generation module do not normally operate, and the third state is usually in a short period when the photovoltaic air conditioner is just started.
Because the thermoelectric cooling element is powered by the direct current bus, so long as the photovoltaic air conditioner is started, the thermoelectric cooling element can be powered, no matter what state the heat pump unit and the photovoltaic power generation module are in (the three states), the power consumption requirement of the thermoelectric cooling element can be guaranteed, the frequency converter 1 can be well cooled, and especially when the photovoltaic air conditioner is started in a high-temperature environment, the frequency converter 1 can still be cooled through the thermoelectric cooling element under the condition that the photovoltaic air conditioner is just started and the heat pump unit and the photovoltaic power generation module are not normally operated (the third state), the allowable temperature rise allowance of the frequency converter 1 is enlarged, the frequency converter 1 is prevented from being excessively fast after normal operation, and continuous normal operation of the frequency converter 1 is guaranteed.
The photovoltaic power generation module and the mains supply can be switched to supply power for the inversion module, and in a first state, the electric quantity generated by the photovoltaic power generation module is converted into alternating current by the inversion module and then is supplied to the heat pump unit for use; under the second state, the electric quantity generated by the photovoltaic power generation module is converted into alternating current through the inversion module and then is supplied to the commercial power, so that the photovoltaic power generation module and the commercial power grid-connected power generation function is realized, a storage battery is not needed to be arranged for the photovoltaic power generation module, and the photovoltaic air conditioner is simple in structure.
Optionally, in other embodiments of the photovoltaic air conditioner of the present invention, a storage battery may be further provided, in the second state, the electric quantity generated by the photovoltaic power generation module is stored in the storage battery, when the electric quantity generated by the photovoltaic power generation module is insufficient, the storage battery is used to discharge to the dc bus, for example, the storage battery may be connected in series in a line from the photovoltaic power generation module to the dc bus, the electric quantity generated by the photovoltaic power generation module is first stored in the storage battery and then is used to supply power to the dc bus by the storage battery, or the storage battery is connected in parallel on a line from the photovoltaic power generation module to the dc bus, the electric quantity generated by the photovoltaic power generation module first satisfies the operation of the heat pump unit, and when the operation of the heat pump unit is satisfied, the surplus electric quantity is stored in the storage battery, and when the electric quantity generated by the photovoltaic power generation module is insufficient, the storage battery is used to perform electric quantity compensation.
In the embodiment, the electric quantity generated by the photovoltaic power generation module and the commercial power are converted into alternating current through the inversion module after being combined at the direct current bus, and then the alternating current is supplied to the heat pump unit for use, however, in other embodiments of the photovoltaic air conditioner, the heat pump unit can be independently powered by the commercial power and the photovoltaic power generation module respectively, the photovoltaic power generation module is preferentially used for powering the heat pump unit when the photovoltaic power generation is sufficient, and the commercial power is switched to power the heat pump unit when the photovoltaic power generation is insufficient; in the scheme, the thermoelectric cooling piece can only be directly powered by the photovoltaic power generation module or directly powered by the storage battery, so that the power consumption requirement of most states of the thermoelectric cooling piece can be ensured, however, in the scheme, no commercial power is converted into direct current, when the photovoltaic power generation module in the third state does not start to normally operate, the thermoelectric cooling piece can only be powered by the storage battery, the electric quantity of the storage battery is possibly exhausted, the phenomenon of insufficient power supply of the thermoelectric cooling piece occurs, and then the phenomenon of poor cooling of the frequency converter 1 occurs, so that the direct current bus is preferably adopted to power the thermoelectric cooling piece, and thus, as long as the photovoltaic air conditioner is started, the power consumption requirement of the thermoelectric cooling piece can be ensured by the commercial power even if the heat pump unit and the photovoltaic power generation module do not normally operate, and the continuous cooling of the frequency converter 1 can be ensured to be good.
Optionally, in other embodiments of the photovoltaic air conditioner of the present invention, the first cold end 31 and the refrigerant cooling member 2 may also act on different positions of the frequency converter 1, for example, the first cold end 31 and the refrigerant cooling member 2 may be attached to two sides of the frequency converter 1, so that when the device cooling member 3 is required to cool the frequency converter 1, the first cold end 31 exchanges heat with the frequency converter 1 directly, which is beneficial to improving the cooling efficiency of the device cooling member 3 on the frequency converter 1, however, both the first cold end 31 and the refrigerant cooling member 2 only cover a part of the core heating area (for example, the IGBT module 11) of the frequency converter 1, both the first cold end 31 and the refrigerant cooling member 2 only cool a part of the core heating area of the frequency converter 1, and when the thermoelectric cooling is independently started or the refrigerant cooling is independently adopted, neither the frequency converter 1 can be cooled well; the contact area between the refrigerant cooling member 2 and the frequency converter 1 is enlarged, the core heating area of the frequency converter 1 is fully covered by the refrigerant cooling member 2, and thus the frequency converter 1 can be well cooled even if the refrigerant cooling member 2 or the thermoelectric cooling member independently cools the frequency converter 1, and the cooling effect of the cooling assembly on the frequency converter 1 is improved.
Control method embodiment:
the control method of the embodiment is applied to the cooling assembly, and the cooling capacity of the thermoelectric cooling element and the current size are in positive correlation, so that the embodiment can control the cooling capacity of the device cooling element 3 and the environment cooling element 4 by adjusting the current sizes of the device cooling element 3 and the environment cooling element 4, and is convenient for adapting to different cooling demands of the frequency converter 1; alternatively, when the number of the device cooling elements 3 exceeds one, the cooling effect of the device cooling elements 3 on the frequency converter 1 can be adjusted by controlling the opening number of the device cooling elements 3; similarly, when the number of the environmental cooling elements 4 exceeds one, the cooling effect of the environmental cooling elements 4 on the cooling area 81 of the frequency conversion box 8 can be adjusted by controlling the opening number of the environmental cooling elements 4, and the purpose of adjusting the cooling amount can be achieved.
In the first state, the inverter 1 is mainly cooled by the refrigerant cooling element 2, and the refrigerant cooling element 2 is preferably used for independent cooling because the heat efficiency of the refrigerant cooling is significantly higher than that of the thermoelectric cooling.
In the second and third state, the heat pump unit is not in operation and the frequency converter 1 is cooled by means of a thermoelectric cooler.
Of course, in the first state, if the temperature of the inverter 1 is too high (higher than the preset first temperature), the device cooling member 3 may be turned on at the same time, and the refrigerant cooling member 2 and the device cooling member 3 together cool the inverter 1.
Specifically, regarding the control manner of the device cooling element 3, the control may be performed for the above three different states, in which, in a determined state, the current of the device cooling element 3 is controlled according to the temperature of the frequency converter 1, and then the cooling amount of the device cooling element 3 to the frequency converter 1 is controlled, for example, in a first state, three temperature nodes T1, T2, T3 and a current I are preset, T1 > T2 > T3, and when the temperature of the frequency converter 1 is higher than or equal to T1, the current of the device cooling element 3 is adjusted to I; when the temperature of the frequency converter 1 is higher than or equal to T2 and lower than T1, the current of the device cooling element 3 is regulated to be 0.75I; when the temperature of the frequency converter 1 is higher than or equal to T3 and lower than T2, the current of the device cooling piece 3 is regulated to be 0.5I; when the temperature of the frequency converter 1 is lower than T3, the device cooling element 3 is turned off; the values of T3, i.e. the preset first temperature, T1, T2, T3 and I in the first state can be specifically set according to the limiting temperature of the operation of the inverter 1 and the local climate conditions, and of course, in the first state, the thermoelectric cooling is required relatively rarely due to the cooling effect of the refrigerant cooling member 2.
In the second state and the third state, the device cooling element 3 is controlled by referring to the logic in the first state, of course, specific values of T1, T2 and T3 corresponding to different states are different, and the magnitudes of the currents I corresponding to different states are also different, for example, preset temperature values corresponding to the second state are Ta, tb and Tc respectively, preset current values corresponding to the currents are Ia, preset temperature values corresponding to the third state are Tx, ty and Tz respectively, preset current values corresponding to the preset current values are Ix, tc in the second state and Tz in the third state are the initial temperatures required to cool the inverter 1 in the states.
Of course, before the control of executing the specific state is performed, the heat radiation state (the first state, the second state, or the third state) should also be determined, and the specific control flow of the device cooling member may be performed with reference to the flow chart shown in fig. 2.
Specifically, the flowchart shown in fig. 2 is only one control cycle of the device cooling member 3, and the control flow shown in fig. 2 needs to be repeatedly executed at a certain frequency when controlling the device cooling member 3 to realize dynamic control of the device cooling member 3.
In this embodiment, three different preset temperature nodes are set in each heat dissipation state, and four different temperature ranges are divided by the three temperature nodes, corresponding to four current gears, alternatively, in other embodiments of the present invention, the temperature nodes may be set in two, four, five, etc., and the values corresponding to the current gears may be specifically adjusted.
Alternatively, in other embodiments of the present invention, the amount of cooling of the device cooling element 3 may be controlled by adjusting the number of opening devices 3, for example, the number of device cooling elements 3 is four, and in the first state, when the temperature of the inverter 1 is higher than or equal to T1, the number of opening devices 3 is controlled to be four; when the temperature of the frequency converter 1 is higher than or equal to T2 and lower than T1, controlling the current of the device cooling part 3 to be three; when the temperature of the frequency converter 1 is higher than or equal to T3 and lower than T2, controlling the current of the device cooling part 3 to be two; when the temperature of the frequency converter 1 is lower than T3, the device cooling element 3 is completely turned off.
Of course, in other embodiments of the present invention, whether the device cooling element 3 is turned on may be selected according to the operation condition of the heat pump unit, for example, when the heat pump unit is in a normal operation state, the thermoelectric device cooling element 3 and the environmental cooling element 4 are both turned off, or when the device cooling element 3 is turned off and the environmental cooling element 4 is turned on, when the photovoltaic air conditioner is in an on state and the heat pump unit is in an off state, the device cooling element 3 and the environmental cooling element 4 are both turned on, and when the device cooling element 3 is turned on, the control is performed in the above manner.
Regarding the control mode of the environmental cooling element 4, two temperature nodes T4 and T5 are preset, T4 is larger than T5, a temperature sensor is arranged in the cooling area 81, the temperature sensor detects the environmental temperature of the cooling area 81, and when the environmental temperature of the cooling area 81 is higher than or equal to T4, the environmental cooling element 4 is started; when the ambient temperature of the cooling zone 81 is higher than or equal to T5 and lower than T4, the open or closed state of the ambient cooling member 4 is maintained; when the ambient temperature of the cooling zone 81 is lower than T5, the ambient cooling element 4 is turned off; the specific values of T4 and T5 may be specifically set with reference to the limit operating temperature range and the local climate conditions of the frequency converter 1.
Finally, it should be emphasized that the foregoing description is merely illustrative of the preferred embodiments of the invention, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and principles of the invention, and any such modifications, equivalents, improvements, etc. are intended to be included within the scope of the invention.
Claims (11)
1. Cooling module, its characterized in that:
the thermoelectric cooling device comprises a device cooling piece and a thermoelectric cooling piece, wherein the device cooling piece is provided with a first cold end and a first hot end, and the first cold end exchanges heat with the refrigerant cooling piece;
the cooling assembly further comprises a partition plate, wherein one side space of the partition plate is a cooling area, the other side space of the partition plate is a heat dissipation area, the device cooling piece is fixedly connected with the partition plate, the refrigerant cooling piece and the first cold end are both positioned in the cooling area, and the first hot end is positioned in the heat dissipation area;
the thermoelectric cooling piece further comprises an environmental cooling piece which is fixedly connected with the partition board, the environmental cooling piece is provided with a second cold end and a second hot end, the second cold end is suspended in the cooling area, and the second hot end is positioned in the heat dissipation area;
the heat dissipation area is provided with a first fan, and the first fan blows air flowing in the heat dissipation area;
the cooling area is provided with a second fan, and the second fan blows air flow of the cooling area.
2. The cooling assembly of claim 1, wherein:
the cooling area is a closed space.
3. The cooling assembly of claim 1, wherein:
the device cooling element is independently controlled from the ambient cooling element.
4. A cooling assembly according to any one of claims 1 to 3, wherein:
the device cooling elements have at least two groups, each group having at least one of the device cooling elements, each group of the device cooling elements being independently controllable.
5. A cooling assembly according to any one of claims 1 to 3, wherein:
the first cold end is attached to the surface of the refrigerant cooling piece.
6. The photovoltaic air conditioner comprises a photovoltaic power generation module, a heat pump unit and a heating device, and is characterized in that:
the cooling assembly according to any one of claims 1 to 5, wherein the refrigerant cooling member is arranged at the heating device, the refrigerant cooling member is supplied with refrigerant by the heat pump unit, and the first cold end is positioned at one side of the refrigerant cooling member, which is opposite to the heating device.
7. The photovoltaic air conditioner of claim 6, wherein:
the heating device comprises a frequency converter, the frequency converter is provided with a rectifying module, an inversion module and a direct current bus, the direct current bus is connected between the rectifying module and the inversion module, the photovoltaic power generation module is electrically connected with the direct current bus, and the thermoelectric cooling piece is electrically connected with the direct current bus.
8. The photovoltaic air conditioner comprises a photovoltaic power generation module and a heating device, and is characterized in that:
the thermoelectric cooling piece is provided with a third hot end and a third cold end, the third cold end and the refrigerant cooling piece are both arranged at the heating device, and the third cold end and the refrigerant cooling piece act on different positions of the heating device;
the photovoltaic air conditioner further comprises a partition board, wherein one side space of the partition board is a cooling area, the other side space of the partition board is a heat dissipation area, the thermoelectric cooling piece is fixedly connected with the partition board, the refrigerant cooling piece and the third cold end are both positioned in the cooling area, and the third hot end is positioned in the heat dissipation area;
the thermoelectric cooling piece further comprises an environmental cooling piece which is fixedly connected with the partition board, the environmental cooling piece is provided with a second cold end and a second hot end, the second cold end is suspended in the cooling area, and the second hot end is positioned in the heat dissipation area;
the heat dissipation area is provided with a first fan, and the first fan blows air flowing in the heat dissipation area;
the cooling area is provided with a second fan, and the second fan blows air flow of the cooling area.
9. The control method for a cooling module according to any one of claims 1 to 5, wherein the refrigerant cooling member is supplied with refrigerant from a heat pump unit, characterized in that:
and when the heating device is determined to be required to be cooled and the heat pump unit is determined to be in a shutdown state, the device cooling piece is started.
10. The control method according to claim 9, characterized in that:
and when the heat pump unit is determined to be in an on state and the temperature of the heating device is higher than a preset first temperature, the device cooling part is started.
11. The control method according to claim 9 or 10, characterized in that:
the heat dissipation state is determined according to the running state of the heat pump unit, or the heat dissipation state is determined according to the running state of the heat pump unit and the running state of the heating device, and under the condition of the same heat dissipation state:
the magnitude of the current of the device cooling piece is positively correlated with the magnitude of the temperature of the heating device;
or the device cooling member has at least two, and the number of the device cooling members to be turned on is positively correlated with the temperature of the heat generating device.
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