CN106855279B - Air conditioning system, refrigeration control method and device - Google Patents

Air conditioning system, refrigeration control method and device Download PDF

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Publication number
CN106855279B
CN106855279B CN201510896941.2A CN201510896941A CN106855279B CN 106855279 B CN106855279 B CN 106855279B CN 201510896941 A CN201510896941 A CN 201510896941A CN 106855279 B CN106855279 B CN 106855279B
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Prior art keywords
evaporator
refrigeration
refrigeration cycle
pump
condenser
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CN106855279A (en
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梁婷
谯峤
万积清
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Vertiv Tech Co Ltd
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Vertiv Tech Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007—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 cooling apparatus specially adapted for use in air-conditioning
    • F24F5/001—Compression cycle type
    • 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
    • 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
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
    • 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
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • 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
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/024—Compressor control by controlling the electric parameters, e.g. current or voltage
    • 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
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • 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]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention discloses an air conditioning system, a refrigeration control method and a refrigeration control device, which are used for improving the annual energy efficiency ratio of an air conditioner, reducing the energy consumption of the air conditioner and improving the working reliability of the air conditioner. The air conditioning system includes: at least one first refrigeration cycle circuit and at least one second refrigeration cycle circuit, the first refrigeration cycle circuit including a first evaporator element, a compressor, a first condenser element and a first throttle valve which are connected in series and form a closed cycle; the second refrigeration cycle circuit includes a second evaporator element, a second condenser element, a pump, and a second throttle valve which are connected in series and form a closed cycle; wherein: the first evaporator element in the first refrigeration cycle loop and the second evaporator element in the second refrigeration cycle loop form a composite evaporator, the first evaporator element is positioned on the air outlet side of the composite evaporator, and the second evaporator element is positioned on the air inlet side of the composite evaporator.

Description

Air conditioning system, refrigeration control method and device
Technical Field
The invention relates to the technical field of refrigeration equipment, in particular to an air conditioning system, a refrigeration control method and a refrigeration control device.
Background
With the development of modern information technology, the number and scale of national communication rooms are also continuously expanding. Under the call of national energy-saving and emission-reducing policies, reducing the energy consumption of machine rooms becomes a key point of attention of many operators. According to investigation, in a machine room, the operation power consumption of the precise air conditioner only accounts for more than 50% of the total power consumption of the machine room. In a plurality of base stations and module offices, the power consumption of the air conditioner can reach about 70% of the total power consumption of the base stations or the module offices. Therefore, effectively reducing the power consumption of the air conditioner is an important direction for reducing the energy consumption of the machine room.
As shown in fig. 1, an air conditioning system includes: a compressor 010, a condenser 011, a liquid storage tank 012, a pump 013, an expansion valve 014 and an evaporator 015 which are connected in sequence and form a closed cycle through a refrigerant pipe, a first bypass valve 016 connected in parallel with the compressor 010, and a second bypass valve 017 connected in parallel with the pump 013. When the outdoor temperature is high, the first bypass valve 016 is closed, the second bypass valve 017 is opened, and the air conditioning system operates in a compressor mode; when the outdoor temperature is low, the first bypass valve 016 is opened, the second bypass valve 017 is closed, and the air conditioning system runs in a pump mode; when the outdoor temperature is in the transition season, the air conditioning system also needs to be operated in the compressor mode because the pump mode cannot meet the cooling demand.
The prior art has the defects that the running time of a pump mode in the whole year is relatively short, and the improvement of the whole year energy efficiency ratio is not greatly contributed; the flow of the refrigerant of the pump and the compressor is also not adjustable, which is not beneficial to saving energy consumption of the system; in addition, in the above system, if a refrigerant line fails, for example, a refrigerant leaks, both the compressor mode and the pump mode cannot be operated, resulting in poor operational reliability of the system.
Disclosure of Invention
The embodiment of the invention aims to provide an air conditioning system, a refrigeration control method and a refrigeration control device, so as to improve the annual energy efficiency ratio of an air conditioner, reduce the energy consumption of the air conditioner and improve the working reliability of the air conditioner.
The air conditioning system provided by the embodiment of the invention comprises at least one first refrigeration circulation loop and at least one second refrigeration circulation loop, wherein the first refrigeration circulation loop comprises a first evaporator element, a compressor, a first condenser element and a first throttle valve which are sequentially connected and form a closed circulation; the second refrigeration cycle circuit includes a second evaporator element, a second condenser element, a pump, and a second throttle valve, which are connected in series and form a closed cycle; wherein:
the first evaporator element in the first refrigeration cycle loop and the second evaporator element in the second refrigeration cycle loop form a composite evaporator, the first evaporator element is located on the air outlet side of the composite evaporator, and the second evaporator element is located on the air inlet side of the composite evaporator.
Optionally, in the first refrigeration cycle loop, at least two first evaporator elements are arranged in parallel; and/or, in the second refrigeration cycle, at least two second evaporator elements are arranged in parallel.
Optionally, the first evaporator element comprises an integral cross-type coil or a split individual-type coil, and the second evaporator element comprises an integral cross-type coil or a split individual-type coil;
the first condenser element is a water-cooled condenser element, an air-cooled condenser element or an evaporative condenser element; the second condenser element is a water-cooled condenser element, an air-cooled condenser element or an evaporative condenser element.
Preferably, the number of the first refrigeration cycle circuits is one, and the number of the second refrigeration cycle circuits is one;
in the first refrigeration cycle loop, the number of the first evaporator elements is two, and the first evaporator elements are arranged in parallel;
in the second refrigeration cycle loop, the number of the second evaporator elements is two and the second evaporator elements are arranged in parallel;
a first condenser element in the first refrigeration cycle loop and a second condenser element in the second refrigeration cycle loop form a composite condenser; or the first condenser element in the first refrigeration cycle and the second condenser element in the second refrigeration cycle are arranged in a dispersed manner.
More preferably, the first refrigeration cycle further includes: an auxiliary pump located between the first condenser element and the first throttle valve, and a bypass valve disposed in parallel with the compressor.
More preferably, the first refrigeration cycle further includes: a first reservoir located between the first condenser element and the auxiliary pump; and/or
The second refrigeration cycle further includes: a second liquid reservoir located between the second condenser element and the pump.
Preferably, the air conditioning system further comprises an auxiliary evaporator and a third throttle valve, wherein:
an inlet of the third throttle valve connected to the first condenser element in the first refrigeration cycle and to the pump in the second refrigeration cycle;
the inlet of the auxiliary evaporator is connected to the outlet of the third throttle valve and the outlet of the auxiliary evaporator is connected to the second condenser element of the second refrigeration cycle.
In the technical scheme of the embodiment of the invention, when in a transition season, a pressure pump mode of the air conditioning system, namely a mode that the compressor and the pump run simultaneously, can be started. The refrigerant of the second refrigeration cycle loop obtains cold energy from an outdoor natural cold source and flows through the coil pipe of the second evaporator element after being distributed, so that the indoor return air is cooled once, and the first refrigeration cycle loop can supplement the residual cold energy required by the temperature reduction of the return air. In addition, the first refrigeration cycle circuit and the second refrigeration cycle circuit are provided with respective refrigerant pipelines, and the fault of one of the refrigeration cycle circuits does not affect the other refrigeration cycle circuit, so that the redundancy of an air conditioning system is favorably improved, and the working reliability of the air conditioner is further improved.
Based on the same inventive concept, the embodiment of the present invention further provides an air conditioning system, including: two first refrigeration cycle circuits, each of which includes a first evaporator element, an indoor compressor, a first condenser element, and a first throttle valve, which are sequentially connected and form a closed cycle; the air conditioning system further includes:
the first branch of the pump, the first second evaporator element and the first second condenser element are sequentially connected to form a second refrigeration cycle loop;
the two first evaporator elements correspond to the two second evaporator elements one to one, the corresponding first evaporator elements and the corresponding second evaporator elements form the composite evaporator, the first evaporator elements are located on the air outlet side of the composite evaporator, and the second evaporator elements are located on the air inlet side of the composite evaporator.
Optionally, the two second condenser elements form a combined condenser, and the combined condenser includes two inlet portions correspondingly connected to the two second evaporator elements, and one outlet portion connected to the pump; alternatively, two second condenser elements are distributed.
Preferably, the air conditioning system further includes: a liquid reservoir located between the two second condenser elements and the pump.
Similarly, when in a transition season, the pressure pump mode of the air conditioning system, i.e., the mode in which the compressor and pump are running simultaneously, may be turned on. The refrigerants of the two second refrigeration circulation loops acquire cold from an outdoor natural cold source and flow through the coil pipe of the second evaporator element after being distributed, so that the indoor return air is cooled for the first time, and the first refrigeration circulation loop can supplement the residual cold required by the temperature reduction of the return air. Compared with the prior art, the embodiment scheme reduces the output and power consumption of the compressor, thereby improving the annual energy efficiency ratio of the air conditioner and reducing the energy consumption of the air conditioner. In addition, the first refrigeration cycle circuit and the second refrigeration cycle circuit are provided with respective refrigerant pipelines which are not influenced with each other, so that the redundancy of an air conditioning system is improved, and the working reliability of the air conditioner is improved.
Based on the same inventive concept, the embodiment of the invention also provides a refrigeration control method, which comprises the following steps:
when the mode of the pressure pump is started, determining the maximum output power of the pump according to the outdoor temperature;
controlling the pump to work according to the maximum output power;
determining a first refrigeration requirement of the compressor according to the indoor return air temperature and the return air temperature after passing through the second evaporator element;
and adjusting the output power of the compressor according to the first refrigeration demand.
Further, the method also includes:
when the compressor is started in the mode, determining a second refrigeration requirement of the compressor according to the indoor return air temperature;
and adjusting the output power of the compressor according to the second refrigeration requirement.
Further, the method also includes:
when the pump mode is started, determining a third refrigeration requirement of the pump according to the indoor return air temperature;
and adjusting the output power of the pump according to the third refrigeration demand.
Further, the method also includes:
respectively determining the superheat degree according to the suction temperature and the suction pressure of the evaporator element in each work;
and adjusting the opening degree of each working throttling valve according to the corresponding superheat degree of each working evaporator element and the stored target superheat degree parameter.
When in the transition season, the pressure pump mode of the air conditioning system, i.e. the mode in which the compressor and the pump are running simultaneously, may be turned on. The refrigerant of the second refrigeration cycle loop obtains cold energy from an outdoor natural cold source and flows through the coil pipe of the second evaporator element after being distributed, so that the indoor return air is cooled once, and the first refrigeration cycle loop can supplement the residual cold energy required by the temperature reduction of the return air.
Based on the same inventive concept, the embodiment of the present invention also provides a refrigeration control apparatus, including:
a first determining unit for determining a maximum output power of the pump according to an outdoor temperature when the pump mode is started;
the control unit is used for controlling the pump to work according to the maximum output power;
the second determining unit is used for determining the first refrigeration requirement of the compressor according to the indoor return air temperature and the return air temperature passing through the second evaporator element;
and the first adjusting unit is used for adjusting the output power of the compressor according to the first refrigeration demand.
Further, the apparatus further comprises:
the third determining unit is used for determining a second refrigeration requirement of the compressor according to the indoor return air temperature when the compressor is started in the mode;
and the second adjusting unit is used for adjusting the output power of the compressor according to the second refrigeration demand.
Further, the apparatus further comprises:
the fourth determining unit is used for determining a third refrigeration requirement of the pump according to the indoor return air temperature when the pump is started in the mode;
and the third adjusting unit is used for adjusting the output power of the pump according to the third refrigeration demand.
Further, the apparatus further comprises:
a fifth determining unit for determining the degree of superheat based on the suction temperature and suction pressure at the evaporator element in each operation, respectively;
and the fourth adjusting unit is used for adjusting the opening of the throttle valve in each work according to the corresponding superheat degree of the evaporator element in each work and the stored target superheat degree parameter.
The method has the advantages that when the air conditioner is in a transition season, the pressure pump mode of the air conditioner system, namely the mode that the compressor and the pump run simultaneously, can be started. The refrigerant of the second refrigeration cycle loop obtains cold energy from an outdoor natural cold source and flows through the coil pipe of the second evaporator element after being distributed, so that the indoor return air is cooled once, and the first refrigeration cycle loop can supplement the residual cold energy required by the temperature reduction of the return air.
Drawings
Fig. 1 is a schematic structural diagram of a conventional air conditioning system;
FIG. 2 is a schematic structural diagram of an air conditioning system according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a second air conditioning system according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a third air conditioning system according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a four-air-conditioning system according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a fifth air conditioning system according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a six-air conditioning system according to an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of an air conditioning system according to an embodiment of the present invention;
FIG. 9 is a schematic structural diagram of an eighth air conditioning system according to an embodiment of the present invention;
FIG. 10 is a schematic structural diagram of a nine-air-conditioning system according to an embodiment of the present invention;
FIG. 11a is a flow chart of a ten-step refrigeration control method (pressure pump mode) according to an embodiment of the present invention;
fig. 11b is a schematic flow chart (compressor mode) of a ten-way refrigeration control method according to an embodiment of the present invention;
fig. 11c is a schematic flow chart (pump mode) of a ten-way refrigeration control method according to an embodiment of the present invention;
fig. 11d is a schematic flow chart illustrating the starting principle of each mode of the air conditioning system in the tenth embodiment of the present invention;
FIG. 12a is a schematic view of a first form of an eleventh refrigeration control apparatus according to an embodiment of the present invention;
FIG. 12b is a schematic view of a second type of refrigeration control apparatus according to an eleventh embodiment of the present invention;
FIG. 12c is a schematic view of a third form of an eleventh refrigeration control apparatus according to an embodiment of the present invention;
fig. 12d is a schematic diagram of a fourth form of eleventh refrigeration control apparatus according to the embodiment of the present invention.
Detailed Description
In order to improve the annual energy efficiency ratio of an air conditioner, reduce the energy consumption of the air conditioner and improve the working reliability of the air conditioner, the embodiment of the invention provides an air conditioner system, a refrigeration control method and a refrigeration control device. In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail by referring to the following examples.
Example one
As shown in fig. 2, the air conditioning system according to the first embodiment of the present invention includes at least one first refrigeration cycle 110 and at least one second refrigeration cycle 120, the first refrigeration cycle 110 including a first evaporator element 111, a compressor 112, a first condenser element 113, and a first throttle valve 114 which are sequentially connected and form a closed cycle; the second refrigeration cycle circuit 120 includes a second evaporator element 121, a second condenser element 122, a pump 123 and a second throttle valve 124 which are sequentially connected and form a closed cycle; wherein:
the first evaporator element 111 in the first refrigeration cycle 110 and the second evaporator element 121 in the second refrigeration cycle 120 form a composite evaporator, the first evaporator element 111 is located on the air outlet side of the composite evaporator, and the second evaporator element 121 is located on the air inlet side of the composite evaporator.
The specific types of the first evaporator element 111 and the second evaporator element 121 are not limited, and may be, for example, an integral cross-type coil or a split independent coil.
The specific types of the first condenser element 113 and the second condenser element 122 are not limited, and may be, for example, a water-cooled condenser element, an air-cooled condenser element, an evaporative condenser element, or the like.
The compressor 112 may be a constant capacity compressor or a variable capacity compressor.
The pump 123 may be a fixed frequency pump or a variable frequency pump.
The first throttle valve 114 and the second throttle valve 124 may be electronic expansion valves or other valve bodies capable of performing intelligent flow rate adjustment.
The specific number of the first refrigeration cycle 110 and the second refrigeration cycle 120 is not limited, and can be flexibly designed according to the application and the refrigeration requirement. The number of the first evaporator element 111 in the first refrigeration cycle 110 is the same as the number of the second evaporator element 121 in the second refrigeration cycle 120, but the specific number is not limited. Preferably, in the first refrigeration cycle 110, at least two first evaporator elements 111 are arranged in parallel; in the second refrigeration cycle 120, the number of the second evaporator elements 121 corresponds to the number of the first evaporator elements 111, and these second evaporator elements 121 are arranged in parallel.
In the embodiment shown in fig. 2, specifically:
the number of the first refrigeration cycle circuits 110 is one, and the number of the second refrigeration cycle circuits 120 is one;
in the first refrigeration cycle 110, the number of the first evaporator elements 111 is two and they are arranged in parallel;
in the second refrigeration cycle 120, the number of the second evaporator elements 121 is two and arranged in parallel;
the first condenser element 113 in the first refrigeration cycle 110 and the second condenser element 122 in the second refrigeration cycle 120 constitute a compound condenser.
When in the transition season, the pressure pump mode of the air conditioning system, i.e. the mode in which the compressor and the pump are running simultaneously, may be turned on. The refrigerant of the second refrigeration cycle loop obtains cold energy from an outdoor natural cold source and flows through the coil pipe of the second evaporator element after being distributed, so that the indoor return air is cooled once, and the first refrigeration cycle loop can supplement the residual cold energy required by the temperature reduction of the return air.
In addition, the first refrigeration cycle circuit and the second refrigeration cycle circuit are provided with respective refrigerant pipelines, and the fault of one of the refrigeration cycle circuits does not affect the other refrigeration cycle circuit, so that the redundancy of an air conditioning system is favorably improved, and the working reliability of the air conditioner is further improved.
The first condenser element in the first refrigeration cycle loop and the second condenser element in the second refrigeration cycle loop form the composite condenser, so that the system compactness can be improved, the outdoor floor area is reduced, and the outdoor heat dissipation capacity is favorably reduced.
Example two
As shown in fig. 3, the structure of the air conditioning system of this embodiment is different from the structure of the air conditioning system of the embodiment:
the first condenser element 213 in the first refrigeration cycle 210 is disposed separately from the second condenser element 222 in the second refrigeration cycle 220. Therefore, the configuration requirements of different refrigeration circulation loops can be met, and the configuration mode is more flexible.
EXAMPLE III
As shown in fig. 4, the structure of the air conditioning system of this embodiment is different from that of the second air conditioning system of the embodiment in that:
the first refrigeration cycle 310 further includes: an auxiliary pump 315 located between the first condenser element 313 and the first throttle valve 314, and a bypass valve 316 disposed in parallel with the compressor 312.
When the outdoor temperature is low enough, the first refrigeration cycle 310 does not work, and the second refrigeration cycle 320 is used for providing the required cold energy; however, when the outdoor temperature is low enough, the second refrigeration cycle 320 is not enough to provide the required cooling capacity, at this time, the compressor 312 is still closed, the bypass valve 316 is opened, the cooling capacity provided by the refrigeration cycle in which the pump 323 is located is used for first cooling of the return air, the cooling capacity provided by the refrigeration cycle in which the auxiliary pump 315 is located is used for second cooling of the return air, and the two refrigeration cycle are jointly operated to provide sufficient cooling capacity, so that the power consumption of the air conditioning system is saved, and the energy efficiency ratio of the air conditioning system is improved.
Example four
As shown in fig. 5, the structure of the air conditioning system of this embodiment is different from the structure of the three air conditioning systems of the embodiments in that:
the first refrigeration cycle 410 further includes: a first reservoir 417 located between first condenser element 413 and auxiliary pump 415;
the second refrigeration cycle 420 further includes: a second reservoir 425 located between second condenser element 422 and pump 423.
In addition, the first condenser element 413 of the first refrigeration cycle 410 and the second condenser element 422 of the second refrigeration cycle 420 constitute a composite condenser.
The beneficial effects of this embodiment are the same as embodiment three to, add the liquid storage pot in two refrigeration cycle loops, can also improve reliability and stability of system operation. In addition, the first condenser element in the first refrigeration cycle loop and the second condenser element in the second refrigeration cycle loop form the composite condenser, so that the system compactness can be improved, the outdoor floor area is reduced, and the outdoor heat dissipation capacity is favorably reduced.
EXAMPLE five
As shown in fig. 6, the structure of the air conditioning system of this embodiment is different from the structure of the air conditioning system of the first embodiment in that:
the first condenser element 513 and the second condenser element 522 are evaporative condenser elements. By adopting the scheme, the air quantity can be effectively reduced, the power consumption of the compressor is reduced, and the condensing efficiency is improved, so that the energy efficiency ratio of the air conditioning system is obviously improved, and the air conditioning system is particularly suitable for arid and rainless areas.
EXAMPLE six
As shown in fig. 7, the structure of the air conditioning system of this embodiment is different from the structure of the air conditioning system of the first embodiment in that:
the air conditioning system further comprises an auxiliary evaporator 631 and a third throttle valve 632, wherein: an inlet of the third throttle valve 632 is connected to the first condenser element 613 in the first refrigeration cycle 610, and to the pump 623 in the second refrigeration cycle 620; an inlet of the auxiliary evaporator 631 is connected to an outlet of the third throttle valve 632, and an outlet of the auxiliary evaporator 631 is connected to the second condenser element 622 in the second refrigeration cycle 620.
By adopting the structure of the embodiment, on one hand, the proper amount of the refrigerant supplied to the first evaporator element and the second evaporator element can be ensured, and on the other hand, the auxiliary evaporator can also refrigerate, thereby improving the refrigerating capacity of the air conditioning system.
EXAMPLE seven
As shown in fig. 8, the air conditioning system of this embodiment is based on the same inventive concept as the previous embodiment, and includes:
two first refrigeration cycle circuits 710, each first refrigeration cycle circuit 710 including a first evaporator element 711, an indoor compressor 712, a first condenser element 713, and a first throttle valve 714, which are sequentially connected and form a closed cycle;
in addition, the air conditioning system further includes: a pump 723, a flow rate distribution valve 741, two second evaporator elements 721 and two second condenser elements 722, wherein the pump 723, the first branch of the flow rate distribution valve 741, the first second evaporator element 721 and the first second condenser element 722 are sequentially connected to form a second refrigeration cycle circuit 720, and the pump 723, the second branch of the flow rate distribution valve 741, the second evaporator element 721 and the second condenser element 722 are sequentially connected to form the second refrigeration cycle circuit 720; the two first evaporator elements 711 correspond to the two second evaporator elements 721 one by one, the corresponding first evaporator elements 711 and second evaporator elements 721 form a composite evaporator, the first evaporator elements 711 are located on the air outlet side of the composite evaporator, and the second evaporator elements 721 are located on the air inlet side of the composite evaporator.
In the embodiment, the first evaporator element and the second evaporator element which correspond to each other form the composite evaporator, the first evaporator element is located on the air outlet side of the composite evaporator, and the second evaporator element is located on the air inlet side of the composite evaporator.
In addition, the first refrigeration cycle circuit and the second refrigeration cycle circuit are provided with respective refrigerant pipelines which are not influenced with each other, so that the redundancy of an air conditioning system is improved, and the working reliability of the air conditioner is improved.
Furthermore, compared with the structure of the air conditioning system of the embodiment, the structure of the air conditioning system of the embodiment has the advantages that the compressor moves from the outdoor to the indoor, and an indoor unit can be formed by the compressor and the composite evaporator, so that the poor lubrication phenomenon of the compressor caused by low temperature is avoided. The refrigerant in the second refrigeration cycle loop obtains cold energy from the outside, is reasonably distributed to the two second evaporator elements through the flow distribution valve to perform evaporation precooling on indoor return air, and then returns to the outside to obtain the cold energy again.
In this embodiment, the two second condenser elements 722 constitute a compound condenser comprising two inlet portions connected to the two second evaporator elements 721, respectively, and one outlet portion connected to the pump 723. The structure can improve the system compactness, reduce the outdoor floor area and is beneficial to reducing the outdoor heat dissipation capacity.
Example eight
As shown in fig. 9, the structure of the air conditioning system of this embodiment is different from that of the air conditioning system of the seventh embodiment in that:
the two second condenser elements 822 are distributed, so that the configuration mode of the air conditioning system is flexible. In addition, it is possible to avoid that the condensation pressure is different due to the difference in the evaporation temperature of the two second evaporator elements 821, and further the condensation heat exchange effect outside the second refrigeration cycle 820 is affected.
Example nine
As shown in fig. 10, the structure of the air conditioning system of this embodiment is different from that of the air conditioning system of the eighth embodiment in that:
the air conditioning system further includes: a liquid reservoir 942 between the two second condenser elements 922 and the pump 923. When the pump 923 is a variable capacity pump, the liquid storage tank 942 may provide sufficient refrigerant to the second refrigeration cycle 920 or store excess refrigerant, thereby improving the stability and reliability of the operation of the second refrigeration cycle 920.
In the above-described first to fifth embodiments and seventh to ninth embodiments, the first refrigeration cycle and the second refrigeration cycle are independent of each other, and the same type or different types of refrigerants may be used.
EXAMPLE ten
As shown in fig. 11a, an embodiment of the present invention further provides a refrigeration control method applied to the first or second embodiment, where the method includes the following steps:
step S111, when the mode of the pump is started, determining the maximum output power of the pump according to the outdoor temperature;
step S112, controlling the pump to work according to the maximum output power;
step S113, determining a first refrigeration requirement of the compressor according to the indoor return air temperature and the return air temperature passing through the second evaporator element;
and step S114, adjusting the output power of the compressor according to the first refrigeration demand.
When in the transition season, the pressure pump mode of the air conditioning system, i.e. the mode in which the compressor and the pump are running simultaneously, may be turned on. The refrigerant of the second refrigeration cycle loop obtains cold energy from an outdoor natural cold source and flows through the coil pipe of the second evaporator element after being distributed, so that the indoor return air is cooled for the first time, and the first refrigeration cycle loop can supplement the residual cold energy required by the return air temperature reduction.
Further, the method embodiment further includes, after step S114:
s115, respectively determining the superheat degree according to the suction temperature and the suction pressure of each evaporator element in work;
and S116, adjusting the opening of the throttle valve in each operation according to the corresponding superheat degree of the evaporator element in each operation and the stored target superheat degree parameter.
By step S115 and step S116, intelligent adjustment of the refrigerant flow rate in the refrigeration cycle can also be achieved.
As shown in fig. 11b, in this embodiment, the method may further specifically include the following steps:
step S211, when the compressor is started in the mode, determining a second refrigeration requirement of the compressor according to the indoor return air temperature;
step S212, adjusting the output power of the compressor according to the second refrigeration requirement;
step S213, respectively determining the superheat degree according to the suction temperature and the suction pressure of the two first evaporator elements;
and step S214, adjusting the opening degrees of the two first throttle valves according to the corresponding superheat degrees of the two first evaporator elements and the stored target superheat degree parameter.
As shown in fig. 11c, in this embodiment, the method may further specifically include the following steps:
step S311, when the pump mode is started, determining a third refrigeration requirement of the pump according to the indoor return air temperature;
step S312, adjusting the output power of the pump according to the third refrigeration requirement;
step 313, respectively determining the superheat degree according to the suction temperature and the suction pressure of the two second evaporator elements;
and step S314, adjusting the opening degrees of the two second throttle valves according to the corresponding superheat degrees of the two second evaporator elements and the stored target superheat degree parameter.
The air conditioning system generally adopts a temperature sensor to monitor indoor and outdoor temperature data in real time, determines the working mode of the air conditioning system by judging an indoor and outdoor temperature difference interval (the indoor and outdoor temperature difference is equal to the indoor temperature minus the outdoor temperature), and pushes the corresponding working mode to start.
When the indoor and outdoor temperature difference delta T is larger than or equal to D1 (if D1 is approximately equal to 30 ℃), only the second refrigeration circulation loop operates, the refrigerant exchanges heat with the outdoor cold source in the outdoor condenser unit, the cold energy of the outdoor natural cold source is fully extracted, the part of cold energy is respectively pumped into the indoor second evaporator element, and the cold energy is conveyed to indoor air through heat exchange, so that the indoor refrigeration requirement is met.
When the indoor and outdoor temperature difference delta T is less than or equal to D2 (such as D2 is approximately equal to 0 ℃), because no temperature difference exists between the indoor and the outdoor or the temperature difference is too small, the energy-saving performance of the operation of the second refrigeration circulation loop cannot be reflected, only the first refrigeration circulation loop is started, the low-temperature low-pressure refrigerant gas from the two first evaporator elements is collected and enters the compressor through the air suction pipe, is compressed into high-temperature high-pressure refrigerant gas, enters the condenser element through the exhaust pipe, is condensed into high-pressure normal-temperature refrigerant liquid, then flows through the throttle valves of the respective pipelines, realizes the temperature reduction and pressure reduction while flow distribution is realized, and then enters the corresponding evaporator elements respectively to evaporate and absorb heat for refrigeration, thereby providing the indoor required refrigeration quantity.
When the outdoor is in a transition season, namely the indoor and outdoor temperature difference D2 is less than delta T and less than D1, at the moment, the outdoor cold source can only provide part of available cold energy, only the second refrigeration circulation loop operates and can not meet the refrigeration requirement, and the first refrigeration circulation loop is opened for refrigeration compensation. The indoor return air firstly passes through the coil pipe of the second evaporator element of the second refrigeration cycle loop to realize primary temperature reduction, then passes through the coil pipe of the first evaporator element of the first refrigeration cycle loop to realize secondary temperature reduction, and finally is discharged indoors.
The principle of starting each mode of the air conditioning system follows the method flow shown in fig. 11d, and comprises the following steps:
step S411, judging whether the indoor and outdoor temperature difference Delta T is not less than a first temperature difference threshold value D1 (for example, D1 is 30 ℃), if so, executing step S412, otherwise, executing step S413;
step S412, starting a pump mode of the air conditioning system;
step S413, judging whether the indoor and outdoor temperature difference Delta T is not larger than a second temperature difference threshold value D2 (for example, D2 is 0 ℃), and if so, executing step S414; otherwise, go to step S415;
step S414, starting a compressor mode of the air conditioning system;
and step S415, starting a pressure pump mode of the air conditioning system.
EXAMPLE eleven
As shown in fig. 12a, based on the same inventive concept, an embodiment of the present invention further provides a refrigeration control apparatus applied to the first or second embodiment, including:
a first determining unit 1201 for determining a maximum output power of the pump according to an outdoor temperature when the pump mode is started;
a control unit 1202 for controlling the pump to operate at maximum output power;
a second determining unit 1203, configured to determine a first refrigeration requirement of the compressor according to the indoor return air temperature and the return air temperature after passing through the second evaporator element;
the first adjusting unit 1204 is configured to adjust an output power of the compressor according to the first refrigeration demand.
Specifically, as shown in fig. 12b, the apparatus may further include:
a third determining unit 1205, configured to determine a second refrigeration requirement of the compressor according to the indoor return air temperature when the compressor is started in the compressor mode;
and a second adjusting unit 1206 for adjusting the output power of the compressor according to the second refrigeration demand.
Specifically, as shown in fig. 12c, the apparatus may further include:
a fourth determining unit 1207, configured to determine a third refrigeration requirement of the pump according to the indoor return air temperature when the pump mode is started;
and a third adjusting unit 1208, configured to adjust the output power of the pump according to the third refrigeration requirement.
Specifically, as shown in fig. 12d, the apparatus may further include:
a fifth determining unit 1209 for determining the degrees of superheat based on the suction temperature and suction pressure at the evaporator element in each operation, respectively;
a fourth adjusting unit 1210 for adjusting the opening of the throttle valve in each operation according to the superheat degree corresponding to the evaporator element in each operation and the stored target superheat degree parameter.
Compared with the prior art, the refrigeration control device has the advantages that the output and the power consumption of the compressor can be reduced, so that the annual energy efficiency ratio of the air conditioner can be improved, and the energy consumption of the air conditioner can be reduced.
In summary, compared with the existing air conditioning system, the air conditioning system provided by the above embodiment of the present invention has the following advantages:
1. the first refrigeration cycle loop and the second refrigeration cycle loop respectively acquire cold energy, and the cold energy is transmitted to each indoor evaporator element through the refrigerant pipeline to carry out evaporation refrigeration, so that the indoor cold load requirement is met. When the first outdoor condenser element and the second outdoor condenser element form the combined condenser, the outdoor unit is compact in structure, space is saved, centralized management and control are facilitated, and heat exchange efficiency of the refrigerant can be improved. The indoor evaporator element can be diversified in form, such as bottom-mounted, top-mounted, side-mounted and the like, thereby improving the adaptability of the air conditioning system.
2. Through reasonable control logic, the intelligent control of the system is realized, and the energy conservation of the system is facilitated. The air conditioning system respectively takes the indoor return air temperature and the outdoor environment temperature as control variables and adjusts the output frequency of the compressor and the pump under different operation modes, thereby realizing the matching of the indoor load and the output capacity of the outdoor unit and avoiding the waste or insufficient cooling capacity. In addition, a superheat degree monitoring strategy is adopted, the opening degree of the throttle valve is adjusted timely, and the refrigerant flow of each evaporator element can be reasonably distributed, so that the problem that the heat exchange efficiency of the evaporator elements is influenced due to insufficient or excessive flow distribution is effectively avoided.
3. The running time and the regional scope of the pump system (namely the second refrigeration cycle loop) can be expanded, and the energy efficiency ratio of the air conditioning system in a transition season and the annual energy efficiency ratio can be improved. The second refrigeration circulation loop fully extracts the cold energy of the outdoor cold source through the refrigerant and then reasonably distributes the cold energy to the coil pipes of the second evaporator elements to realize the primary temperature drop of return air; the first refrigeration cycle loop only needs to compensate the residual cold quantity required by the return air temperature drop, so that partial power consumption of the compressor is saved, the energy conservation of the system is facilitated, and the energy efficiency ratio of the system is improved.
4. The redundancy of the system is improved. The air conditioning system has the advantages that the first refrigeration cycle loop and the second refrigeration cycle loop are provided with respective refrigerant pipelines, and the evaporator element and the condenser element of the air conditioning system are connected in a multi-connection and diversified mode, so that the system redundancy is improved.
5. The scheme of the embodiment of the invention can effectively reduce the configuration of the outdoor unit and the occupied area, thereby reducing the cost of the air conditioning system.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (17)

1. A refrigeration control method is applied to an air conditioning system, and is characterized in that the air conditioning system comprises at least one first refrigeration cycle loop and at least one second refrigeration cycle loop, wherein the first refrigeration cycle loop comprises a first evaporator element, a compressor, a first condenser element and a first throttle valve which are sequentially connected and form a closed cycle; the second refrigeration cycle circuit includes a second evaporator element, a second condenser element, a pump, and a second throttle valve, which are connected in series and form a closed cycle; wherein:
a first evaporator element in the first refrigeration cycle loop and a second evaporator element in the second refrigeration cycle loop form a composite evaporator, the first evaporator element is positioned on the air outlet side of the composite evaporator, and the second evaporator element is positioned on the air inlet side of the composite evaporator;
the first refrigeration cycle circuit and the second refrigeration cycle circuit are provided with respective refrigerant lines;
the number of the first refrigeration circulation loops is one, and the number of the second refrigeration circulation loops is one;
in the first refrigeration cycle loop, the number of the first evaporator elements is two, and the first evaporator elements are arranged in parallel;
in the second refrigeration cycle loop, the number of the second evaporator elements is two, and the two second evaporator elements are arranged in parallel;
a first condenser element in the first refrigeration cycle loop and a second condenser element in the second refrigeration cycle loop form a composite condenser; or the first condenser element in the first refrigeration cycle and the second condenser element in the second refrigeration cycle are arranged in a dispersed manner;
the refrigeration control method comprises the following steps:
when the mode of the pressure pump is started, determining the maximum output power of the pump according to the outdoor temperature;
controlling the pump to work according to the maximum output power;
determining a first refrigeration requirement of the compressor according to the indoor return air temperature and the return air temperature after passing through the second evaporator element;
and adjusting the output power of the compressor according to the first refrigeration demand.
2. The refrigeration control method as recited in claim 1, further comprising:
when the compressor is started in the mode, determining a second refrigeration requirement of the compressor according to the indoor return air temperature;
and adjusting the output power of the compressor according to the second refrigeration demand.
3. The refrigeration control method as recited in claim 1, further comprising:
when the pump mode is started, determining a third refrigeration requirement of the pump according to the indoor return air temperature;
and adjusting the output power of the pump according to the third refrigeration demand.
4. The refrigeration control method according to any one of claims 1 to 3, further comprising:
respectively determining the superheat degree according to the suction temperature and the suction pressure of the evaporator element in each work;
and adjusting the opening degree of each working throttling valve according to the corresponding superheat degree of each working evaporator element and the stored target superheat degree parameter.
5. An air conditioning system controlled by a refrigeration control method, the air conditioning system comprising:
at least one first refrigeration cycle circuit and at least one second refrigeration cycle circuit, the first refrigeration cycle circuit including a first evaporator element, a compressor, a first condenser element, and a first throttle valve which are connected in series and form a closed cycle; the second refrigeration cycle circuit includes a second evaporator element, a second condenser element, a pump, and a second throttle valve, which are connected in series and form a closed cycle; wherein:
a first evaporator element in the first refrigeration cycle loop and a second evaporator element in the second refrigeration cycle loop form a composite evaporator, the first evaporator element is positioned on the air outlet side of the composite evaporator, and the second evaporator element is positioned on the air inlet side of the composite evaporator;
the first refrigeration cycle circuit and the second refrigeration cycle circuit are provided with respective refrigerant lines;
the number of the first refrigeration circulation loops is one, and the number of the second refrigeration circulation loops is one;
in the first refrigeration cycle loop, the number of the first evaporator elements is two, and the first evaporator elements are arranged in parallel;
in the second refrigeration cycle loop, the number of the second evaporator elements is two and the second evaporator elements are arranged in parallel;
a first condenser element in the first refrigeration cycle loop and a second condenser element in the second refrigeration cycle loop form a composite condenser; or the first condenser element in the first refrigeration cycle loop and the second condenser element in the second refrigeration cycle loop are arranged in a dispersed manner;
the refrigeration control method comprises the following steps:
when the mode of the pressure pump is started, determining the maximum output power of the pump according to the outdoor temperature;
controlling the pump to work according to the maximum output power;
determining a first refrigeration requirement of the compressor according to the indoor return air temperature and the return air temperature after passing through the second evaporator element;
and adjusting the output power of the compressor according to the first refrigeration demand.
6. The air conditioning system as claimed in claim 5, wherein in the first refrigeration cycle, at least two first evaporator elements are provided in parallel; and/or, in the second refrigeration cycle, at least two second evaporator elements are arranged in parallel.
7. The air conditioning system as claimed in claim 5,
the first evaporator element comprises an integral cross-coil or a split individual coil, and the second evaporator element comprises an integral cross-coil or a split individual coil;
the first condenser element is a water-cooled condenser element, an air-cooled condenser element or an evaporative condenser element; the second condenser element is a water-cooled condenser element, an air-cooled condenser element or an evaporative condenser element.
8. The air conditioning system as claimed in claim 5,
the first refrigeration cycle further includes: an auxiliary pump located between the first condenser element and the first throttle valve, and a bypass valve disposed in parallel with the compressor.
9. The air conditioning system as claimed in claim 8,
the first refrigeration cycle further includes: a first reservoir located between the first condenser element and the auxiliary pump; and/or
The second refrigeration cycle further includes: a second liquid reservoir located between the second condenser element and the pump.
10. The air conditioning system of claim 5, further comprising an auxiliary evaporator and a third throttle valve, wherein:
an inlet of the third throttle valve connected to the first condenser element in the first refrigeration cycle and to the pump in the second refrigeration cycle;
the inlet of the auxiliary evaporator is connected to the outlet of the third throttle valve and the outlet of the auxiliary evaporator is connected to the second condenser element of the second refrigeration cycle.
11. An air conditioning system is controlled by a refrigeration control method, and is characterized by comprising the following steps: two first refrigeration cycle circuits, each of which includes a first evaporator element, an indoor compressor, a first condenser element, and a first throttle valve, which are connected in sequence and form a closed cycle; the air conditioning system further includes:
the first branch of the pump, the first second evaporator element and the first second condenser element are sequentially connected to form a second refrigeration circulation loop, and the second branch of the pump, the flow distribution valve, the second evaporator element and the second condenser element are sequentially connected to form a second refrigeration circulation loop;
the two first evaporator elements correspond to the two second evaporator elements one to one, the corresponding first evaporator elements and the corresponding second evaporator elements form the composite evaporator, the first evaporator elements are positioned on the air outlet side of the composite evaporator, and the second evaporator elements are positioned on the air inlet side of the composite evaporator;
the first refrigeration cycle circuit and the second refrigeration cycle circuit are provided with respective refrigerant lines;
the refrigeration control method comprises the following steps:
when the mode of the pressure pump is started, determining the maximum output power of the pump according to the outdoor temperature;
controlling the pump to work according to the maximum output power;
determining a first refrigeration requirement of the compressor according to the indoor return air temperature and the return air temperature after passing through the second evaporator element;
and adjusting the output power of the compressor according to the first refrigeration demand.
12. The air conditioning system as claimed in claim 11,
the two second condenser elements form a combined condenser, and the combined condenser comprises two inlet parts correspondingly connected with the two second evaporator elements and one outlet part connected with the pump; alternatively, two second condenser elements are distributed.
13. The air conditioning system as claimed in claim 11 or 12, further comprising: a liquid reservoir located between the two second condenser elements and the pump.
14. A refrigeration control device is applied to an air conditioning system, and is characterized in that the air conditioning system comprises at least one first refrigeration circulation loop and at least one second refrigeration circulation loop, wherein the first refrigeration circulation loop comprises a first evaporator element, a compressor, a first condenser element and a first throttle valve which are sequentially connected and form a closed cycle; the second refrigeration cycle circuit includes a second evaporator element, a second condenser element, a pump, and a second throttle valve, which are connected in series and form a closed cycle; wherein:
a first evaporator element in the first refrigeration cycle loop and a second evaporator element in the second refrigeration cycle loop form a composite evaporator, the first evaporator element is positioned on the air outlet side of the composite evaporator, and the second evaporator element is positioned on the air inlet side of the composite evaporator;
the first refrigeration cycle circuit and the second refrigeration cycle circuit are provided with respective refrigerant lines;
the number of the first refrigeration circulation loops is one, and the number of the second refrigeration circulation loops is one;
in the first refrigeration cycle loop, the number of the first evaporator elements is two, and the first evaporator elements are arranged in parallel;
in the second refrigeration cycle loop, the number of the second evaporator elements is two and the second evaporator elements are arranged in parallel;
a first condenser element in the first refrigeration cycle loop and a second condenser element in the second refrigeration cycle loop form a composite condenser; or the first condenser element in the first refrigeration cycle loop and the second condenser element in the second refrigeration cycle loop are arranged in a dispersed manner;
the refrigeration control device includes:
a first determining unit for determining a maximum output power of the pump according to an outdoor temperature when the pump mode is started;
the control unit is used for controlling the pump to work according to the maximum output power;
the second determining unit is used for determining the first refrigeration requirement of the compressor according to the indoor return air temperature and the return air temperature after passing through the second evaporator element;
and the first adjusting unit is used for adjusting the output power of the compressor according to the first refrigeration demand.
15. The refrigeration control device according to claim 14, further comprising:
the third determining unit is used for determining a second refrigeration requirement of the compressor according to the indoor return air temperature when the compressor is started in the mode;
and the second adjusting unit is used for adjusting the output power of the compressor according to the second refrigeration demand.
16. The refrigeration control device according to claim 14, further comprising:
the fourth determining unit is used for determining a third refrigerating requirement of the pump according to the indoor return air temperature when the pump mode is started;
and the third adjusting unit is used for adjusting the output power of the pump according to the third refrigeration requirement.
17. The refrigeration control device according to any one of claims 14 to 16, further comprising:
a fifth determining unit for determining the degree of superheat based on the suction temperature and suction pressure at the evaporator element in each operation, respectively;
and the fourth adjusting unit is used for adjusting the opening of each working throttling valve according to the corresponding superheat degree of each working evaporator element and the stored target superheat degree parameter.
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