CN115773568A

CN115773568A - Ultralow-temperature refrigeration control method, device, equipment and medium for multi-connected air conditioning system

Info

Publication number: CN115773568A
Application number: CN202211655032.6A
Authority: CN
Inventors: 邱天; 高晗; 焦华超; 金孟孟; 滕天凤
Original assignee: Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
Current assignee: Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
Priority date: 2022-12-22
Filing date: 2022-12-22
Publication date: 2023-03-10

Abstract

The application relates to a multi-connected air conditioning system ultralow temperature refrigeration control method, a multi-connected air conditioning system ultralow temperature refrigeration control device, computer equipment, a storage medium and a computer program product. The method comprises the following steps: when the outdoor environment temperature of the multi-connected air-conditioning system is lower than a first preset environment temperature, acquiring the total capacity of heating indoor units running in a heating mode and the total capacity of refrigerating indoor units running in a refrigerating mode in the multi-connected air-conditioning system; if the total capacity of the heating indoor units is smaller than that of the refrigerating indoor units, determining a target heat exchange indoor unit from idle indoor units of the multi-connected air conditioning system; and controlling the target heat exchange indoor unit to operate in a heating mode, and condensing and releasing heat of the refrigerant discharged by the compressor. By adopting the method, the indoor unit can be effectively prevented from frequently entering the anti-freezing protection, and the use experience of a user is improved.

Description

Ultralow-temperature refrigeration control method, device, equipment and medium for multi-connected air conditioning system

Technical Field

The present application relates to the field of air conditioning technologies, and in particular, to a method and an apparatus for controlling ultra-low temperature refrigeration in a multi-split air conditioning system, a computer device, a storage medium, and a computer program product.

Background

When a user uses air conditioning equipment, the area and the climate are different, the requirements on the air conditioning are also different, the outdoor environment temperature of part of areas in winter can reach ultralow temperature below-10 ℃, but the requirement on refrigeration can still be met in some special rooms (such as equipment rooms, kitchens and the like).

When the air conditioning system is in a refrigeration mode, the heat exchanger of the outdoor unit is used as a condenser, and high-temperature and high-pressure refrigerant discharged by the compressor needs to be condensed and released in the outdoor heat exchanger, throttled and reduced in pressure and then enters the heat exchanger of the indoor unit for evaporation. Under the condition that the outdoor environment temperature is too low, the indoor heat exchanger running at low temperature for a long time may be frozen or frozen, so that the indoor unit is frequently started to prevent freezing protection, and the use experience of a user is influenced.

Disclosure of Invention

Therefore, in order to solve the above technical problems, it is necessary to provide a method, an apparatus, a computer device, a computer readable storage medium, and a computer program product for an ultra-low temperature refrigeration control method of a multi-connected air conditioning system, which can prevent an indoor unit from entering the protection of freezing frequently and improve user experience.

In a first aspect, the present application provides a method for controlling ultra-low temperature refrigeration of a multi-split air conditioning system, where the method includes:

when the outdoor environment temperature of the multi-connected air-conditioning system is lower than a first preset environment temperature, acquiring the total capacity of heating indoor units in a heating mode and the total capacity of refrigerating indoor units in a refrigerating mode in the multi-connected air-conditioning system;

if the total capacity of the heating indoor units is smaller than the total capacity of the refrigerating indoor units, determining target heat exchange indoor units from idle indoor units of the multi-connected air-conditioning system;

and controlling the target heat exchange indoor unit to operate in a heating mode, and condensing and releasing heat for the refrigerant discharged by the compressor.

In one embodiment, the determining a target heat exchange indoor unit from idle indoor units of the multi-connected air conditioning system comprises:

acquiring the indoor environment temperature of each idle indoor unit in the multi-connected air conditioning system;

and taking the idle indoor unit with the indoor environment temperature lower than the second preset environment temperature as the target heat exchange indoor unit.

determining a target heat exchange indoor unit from idle indoor units of the multi-connected air conditioning system according to the available tags; the availability labels are preset based on the importance of the room.

In one embodiment, the determining a target heat exchange indoor unit from idle indoor units of the multi-connected air conditioning system according to the available tags comprises:

acquiring an idle indoor unit of the multi-connected air conditioning system;

and determining the available label from each idle indoor unit, wherein the idle indoor unit with the indoor environment temperature lower than a second preset environment temperature is used as the target heat exchange indoor unit.

In one embodiment, if there are multiple target heat exchange indoor units, the controlling the target heat exchange indoor units to operate in a heating mode, and a refrigerant discharged by a compressor condenses to release heat includes:

sequencing the target heat exchange indoor units according to the ascending sequence of the indoor environment temperature of the target heat exchange indoor units to obtain a target heat exchange indoor unit sequence;

determining the number of target heat exchange indoor units needing to be started based on the capacity difference value between the total capacity of the heating indoor units and the total capacity of the refrigerating indoor units and the heating capacity of each target heat exchange indoor unit in the target heat exchange indoor unit sequence;

controlling the target heat exchange indoor units in the sequence of the target heat exchange indoor units, wherein the target heat exchange indoor units are sequenced in the front to run in a heating mode, and condensing and releasing heat on a refrigerant discharged by a compressor;

and controlling the multi-connected air conditioning system to enter a complete heat recovery mode until the number of the target heat exchange indoor machines started in the target heat exchange indoor machine sequence is equal to the number of the target heat exchange indoor machines needing to be started.

In one embodiment, the method further comprises:

and after the multi-connected air-conditioning system runs for a preset time, returning to the step of acquiring the total capacity of the heating indoor units running in the heating mode and the total capacity of the refrigerating indoor units running in the refrigerating mode in the multi-connected air-conditioning system.

In one embodiment, after the step of controlling the target heat exchange indoor unit to operate in the heating mode and condensing and releasing heat of the refrigerant discharged from the compressor, the method further includes:

and when the indoor environment temperature of the target heat exchange indoor unit operating in the heating mode is higher than the second preset environment temperature, controlling the target heat exchange indoor unit to stop operating in the heating mode, and returning to the step of acquiring the total capacity of the heating indoor units operating in the heating mode and the total capacity of the refrigerating indoor units operating in the refrigerating mode in the multi-connected air conditioning system.

In one embodiment, the controlling the target heat exchange indoor unit to operate in the heating mode includes:

and controlling an electronic expansion valve of the target heat exchange indoor unit to be opened, operating a fan at a preset gear, opening a heating electromagnetic valve corresponding to the mode converter, and closing a refrigerating electromagnetic valve of the mode converter.

In a second aspect, the present application further provides an ultra-low temperature refrigeration control device for a multi-connected air conditioning system, the device includes:

the system comprises a capacity acquisition module, a capacity control module and a control module, wherein the capacity acquisition module is used for acquiring the total capacity of heating indoor units running in a heating mode and the total capacity of refrigerating indoor units running in a refrigerating mode in a multi-connected air-conditioning system when the outdoor environment temperature of the multi-connected air-conditioning system is lower than a first preset environment temperature;

the target heat exchange indoor unit determining module is used for determining a target heat exchange indoor unit from idle indoor units of the multi-connected air conditioning system if the total capacity of the heating indoor units is smaller than the total capacity of the refrigerating indoor units;

and the control module is used for controlling the operation heating mode of the target heat exchange indoor unit and condensing and releasing heat of a refrigerant discharged by the compressor.

In a third aspect, the present application further provides a computer device comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above method when executing the computer program.

In a fourth aspect, the present application also provides a computer-readable storage medium, on which a computer program is stored, which computer program, when executed by a processor, performs the steps of the above-mentioned method.

In a fifth aspect, the present application also provides a computer program product comprising a computer program which, when executed by a processor, performs the steps of the method described above.

According to the ultralow-temperature refrigeration control method, the device, the computer equipment, the storage medium and the computer program product for the multi-connected air-conditioning system, when the outdoor environment temperature of the multi-connected air-conditioning system is lower than a first preset environment temperature, the outdoor environment of the multi-connected air-conditioning system is in the ultralow-temperature environment, the total capacity of heating indoor units in a heating mode and the total capacity of refrigerating indoor units in a refrigerating mode in the multi-connected air-conditioning system are obtained, if the total capacity of the heating indoor units is lower than the total capacity of the refrigerating indoor units, it is indicated that the heating indoor units in the multi-connected air-conditioning system cannot meet the refrigerating requirement of the refrigerating indoor units, at least one part of refrigerant flowing through the refrigerating indoor units in the multi-connected air-conditioning system at present comes from an outdoor unit heat exchanger, and the indoor units are easy to frequently start anti-freezing protection. The target heat exchange indoor unit is determined from the idle indoor unit of the multi-split air-conditioning system, the operation heating mode of the target heat exchange indoor unit is controlled, and the refrigerant discharged by the compressor in the multi-split air-conditioning system is condensed to release heat, so that the refrigerant flowing through the refrigeration indoor unit does not need to pass through the outdoor heat exchanger in the ultralow temperature environment, the indoor unit can be effectively prevented from frequently entering anti-freezing protection, and the use experience of a user is improved.

Drawings

FIG. 1 is an environmental diagram illustrating an application of the ultra-low temperature refrigeration control method of the multi-split air conditioning system according to an embodiment;

FIG. 2 is a schematic flow chart of an ultra-low temperature refrigeration control method of a multi-connected air conditioning system in one embodiment;

FIG. 3 is a schematic flow chart illustrating a step of condensing and releasing heat of a refrigerant discharged from a compressor in a heating mode of the target heat exchange indoor unit according to an embodiment;

fig. 4 is a schematic refrigerant flow direction diagram of a multi-connected air conditioning system operating in a complete cooling mode according to an embodiment;

fig. 5 is a schematic refrigerant flow direction diagram of the multi-connected air conditioning system operating in the main cooling mode according to an embodiment;

FIG. 6 is a schematic refrigerant flow diagram illustrating an embodiment of a multi-connected air conditioning system operating in a full heat recovery mode;

FIG. 7 is a schematic flowchart illustrating a step of condensing and releasing heat of the refrigerant discharged from the compressor in another embodiment of controlling the target heat exchange indoor unit to operate in a heating mode;

FIG. 8 is a schematic flow chart illustrating an ultra-low temperature refrigeration control method of a multi-connected air conditioning system in another embodiment;

FIG. 9 is a block diagram of an ultra-low temperature refrigeration control device of a multi-connected air conditioning system in one embodiment;

FIG. 10 is a diagram showing an internal structure of a computer device according to an embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.

The ultralow-temperature refrigeration control method of the multi-connected air conditioning system provided by the embodiment of the application can be applied to the application environment shown in fig. 1. The multi-connected air conditioning system comprises a plurality of indoor units 101 at the indoor side and an outdoor unit 102 at the outdoor side, the outdoor unit 102 and the indoor units 101 can be controlled by a controller 103, the outdoor unit 102 comprises a compressor 1021, an outdoor heat exchanger 1022, a heating electronic expansion valve 1023, a heating four-way valve 1024, a cooling main four-way valve 1025 and a pipe for connecting with the indoor units 101, and each indoor unit 101 is provided with a corresponding mode converter 104.

The controller 103 is in control connection with each device in the multi-connected air conditioning system, and the data storage system can store data which needs to be processed by the controller 103. The data storage system may be integrated on the controller 103 or may be located on the cloud or other network server. The controller 103 obtains an outdoor environment temperature of the multi-connected air conditioning system, obtains a total capacity of heating indoor units running in a heating mode and a total capacity of refrigerating indoor units running in a refrigerating mode in the multi-connected air conditioning system when the outdoor environment temperature of the multi-connected air conditioning system is lower than a first preset environment temperature, determines a target heat exchange indoor unit from idle indoor units 101 of the multi-connected air conditioning system if the total capacity of the heating indoor units is lower than the total capacity of the refrigerating indoor units, controls the target heat exchange indoor units to run in the heating mode, and condenses and releases heat to a refrigerant output by the compressor 1021. The controller 102 may be any control chip with logic processing capability.

In one embodiment, as shown in fig. 2, an ultra-low temperature refrigeration control method for a multi-type air conditioning system is provided, which is described by taking the method as an example applied to the controller in fig. 1, and includes the following steps:

step 202, when the outdoor environment temperature of the multi-connected air conditioning system is less than a first preset environment temperature, acquiring the total capacity of the heating indoor units in the heating mode and the total capacity of the refrigerating indoor units in the refrigerating mode in the multi-connected air conditioning system.

The multi-connected air conditioning system is an air conditioning system formed by connecting one or more outdoor units with two or more indoor units through pipes, and the indoor units in the multi-connected air conditioning system can be in a heating mode operation state, a cooling mode operation state and an idle state according to the requirements of users.

The outdoor ambient temperature of the multi-connected air conditioning system is the ambient temperature of the environment where the outdoor unit is located in the multi-connected air conditioning system, the outdoor ambient temperature can be acquired in real time through a temperature sensor arranged on the outdoor side, and the controller can also acquire weather information of the geographical position where the multi-connected air conditioning system is located to determine the outdoor ambient temperature.

The first preset environment temperature is used for representing whether the current outdoor environment temperature meets the ultra-low temperature refrigeration running condition or not, and can be determined according to the empirical temperature value of the indoor unit heat exchanger in the multi-connected air conditioning system triggering freezing protection in the ultra-low temperature refrigeration environment.

The total capacity of the heating indoor units refers to the total capacity of the indoor units in the heating mode in the multi-connected air-conditioning system, and can represent the heating capacity of the multi-connected air-conditioning system, namely the heating demand of the multi-connected air-conditioning system. The total capacity of the refrigeration indoor units refers to the total capacity of the indoor units in the refrigeration mode in the multi-connected air-conditioning system, and can represent the refrigeration capacity of the multi-connected air-conditioning system, namely the refrigeration demand of the multi-connected air-conditioning system.

It can be understood that the total capacity of the heating indoor units and the total capacity of the cooling indoor units of the multi-connected air conditioning system can be determined according to the number of the indoor units in the heating mode and the number of the indoor units in the cooling mode, and also can be determined according to the number of the indoor units in the heating mode and the number of the air conditioners in the indoor units in the cooling mode.

For example, when the brands, the electronic control designs and the equipment parameters of the indoor units in the multi-connected air-conditioning system are the same, the total heating indoor unit capacity of the multi-connected air-conditioning system can be determined according to the number of the indoor units in the heating mode, and the total cooling indoor unit capacity of the multi-connected air-conditioning system can be determined according to the number of the indoor units in the cooling mode.

When the brands, the electric control designs and the equipment parameters of the indoor units in the multi-connected air-conditioning system are different, the controller determines the total capacity of the heating indoor units of the multi-connected air-conditioning system according to the air-conditioning matching number of the indoor units running in the heating mode, and determines the total capacity of the refrigerating indoor units of the multi-connected air-conditioning system according to the air-conditioning matching number of the indoor units running in the refrigerating mode.

Specifically, the controller acquires an outdoor environment temperature of the multi-connected air conditioning system, if the outdoor environment temperature is lower than a first preset environment temperature, the outdoor environment of the multi-connected air conditioning system is an ultralow temperature environment, and a risk of frequently triggering anti-freezing protection exists, and the controller acquires a total capacity of heating indoor units operating in a heating mode and a total capacity of cooling indoor units operating in a cooling mode in the current multi-connected air conditioning system.

And 204, if the total capacity of the heating indoor units is smaller than that of the refrigerating indoor units, determining a target heat exchange indoor unit from idle indoor units of the multi-connected air conditioning system.

The idle indoor unit is an indoor unit in an idle state in the multi-connected air-conditioning system, namely an indoor unit in a shutdown state in the multi-connected air-conditioning system. The controller can determine the idle indoor unit in the current multi-connected air conditioning system according to the running state of each indoor unit in the multi-connected air conditioning system. The target heat exchange indoor unit is an idle indoor unit which is used as a condenser at the indoor side, the idle indoor unit is used as an indoor condenser, so that a high-temperature and high-pressure refrigerant can bypass an outdoor ultralow-temperature environment and directly enter the indoor side, the pipe temperature of the refrigeration indoor unit is increased, and the anti-freezing protection of the refrigeration indoor unit due to the fact that the pipe temperature is too low is avoided.

Specifically, the controller compares the total capacity of the heating indoor unit with the total capacity of the refrigerating indoor unit, and if the total capacity of the heating indoor unit is smaller than the total capacity of the refrigerating indoor unit, it is indicated that a refrigerating indoor unit operating in a refrigerating mode exists in the multi-connected air conditioning system at the moment, the multi-connected air conditioning system meets the ultralow temperature refrigerating operation condition, and the heating indoor unit in the multi-connected air conditioning system cannot meet the refrigerating requirement of the refrigerating indoor unit. The controller determines a target heat exchange indoor unit from idle indoor units of the multi-split air conditioning system in an idle state.

And step 206, controlling the target heat exchange indoor unit to operate in a heating mode, and condensing and releasing heat for the refrigerant discharged by the compressor.

Specifically, the controller controls the target heat exchange indoor unit to operate in a heating mode, refrigerant discharged by a compressor in the multi-connected air conditioning system is condensed and released, high-temperature and high-pressure refrigerant discharged by the compressor directly enters the indoor side after being discharged from the compressor, the refrigerant enters a heat exchanger of the target heat exchange indoor unit through a mode heat exchanger corresponding to the target heat exchange indoor unit to be condensed and released, the condensed refrigerant enters a heat exchanger of the refrigerating indoor unit through a mode heat exchanger of the refrigerating indoor unit through a liquid pipe to be evaporated and absorbed, and refrigeration is completed.

In the ultralow-temperature refrigeration control method for the multi-connected air-conditioning system, when the outdoor environment temperature of the multi-connected air-conditioning system is lower than a first preset environment temperature, the outdoor environment of the multi-connected air-conditioning system is in the ultralow-temperature environment, the total capacity of heating indoor units running in a heating mode and the total capacity of refrigerating indoor units running in a refrigerating mode in the multi-connected air-conditioning system are obtained, if the total capacity of the heating indoor units is lower than the total capacity of the refrigerating indoor units, it is indicated that the heating indoor units in the multi-connected air-conditioning system cannot meet the refrigeration requirement of the refrigerating indoor units, at least one part of refrigerant flowing through the refrigerating indoor units in the existing multi-connected air-conditioning system comes from an outdoor unit heat exchanger, and the indoor units are easy to start anti-freezing protection frequently. The target heat exchange indoor unit is determined from the idle indoor units of the multi-split air-conditioning system, the operation heating mode of the target heat exchange indoor unit is controlled, high-temperature and high-pressure refrigerants discharged by compressors in the multi-split air-conditioning system are condensed and released, the refrigerants flowing through the refrigeration indoor unit do not need to pass through an outdoor heat exchanger in an ultralow-temperature environment, the indoor unit can be effectively prevented from frequently entering anti-freezing protection, and the use experience of users is improved.

Further, in an embodiment, the controlling the target heat exchange indoor unit to operate in the heating mode includes: : and controlling an electronic expansion valve of the target heat exchange indoor unit to be opened, operating a fan at a preset gear, opening a heating electromagnetic valve corresponding to the mode converter, and closing a refrigerating electromagnetic valve of the mode converter.

Wherein, when presetting the gear of fan is the indoor set operation of control target heat transfer mode of heating, correspond the operation gear of fan, because the indoor set of target heat transfer is idle indoor set, the indoor environment that the indoor set of target heat transfer is located originally need not to heat or refrigerate, consequently, when the indoor set operation of control target heat transfer mode of heating, the operation gear of fan can not be too high, if the operation gear of fan is too high, then can cause great influence to the indoor ambient temperature in target heat transfer indoor set place. The designer presets the operation gear of the fan according to the actual requirement of a user and/or the influence of the operation heating mode of the target heat exchange indoor unit on the indoor environment temperature, and when the fan operates at the preset gear, the influence on the indoor environment temperature of the target heat exchange indoor unit can be reduced.

In one embodiment, the preset gear of the fan is the lowest gear.

Specifically, after a target heat exchange indoor unit is determined from idle indoor units of the multi-connected air conditioning system, the controller controls an electronic expansion valve of the target heat exchange indoor unit to be opened, so that the target heat exchange indoor unit is opened, a fan corresponding to the target heat exchange indoor unit is controlled to run at a preset gear, a corresponding mode converter opens a heating electromagnetic valve, and closes a cooling electromagnetic valve. The controller controls the operation heating mode of the target heat exchange indoor unit, so that the refrigerant flowing through the refrigerating indoor unit does not need to pass through the outdoor heat exchanger in the ultralow temperature environment, frequent entering of the indoor unit into anti-freezing protection can be effectively avoided, and the use experience of a user is improved.

Since controlling the operation heating mode of the target heat exchange indoor unit may affect more or less the indoor ambient temperature where the target heat exchange indoor unit is located, in one embodiment, determining the target heat exchange indoor unit from an idle indoor unit of the multi-type air conditioning system includes: acquiring the indoor environment temperature of each idle indoor unit in the multi-connected air conditioning system; and taking the idle indoor unit with the indoor environment temperature lower than the second preset environment temperature as the target heat exchange indoor unit.

The second preset environment temperature is used for representing a temperature threshold value of whether the indoor environment where the idle indoor unit in the idle state is located affects user experience, and the second preset environment temperature value is determined by a designer according to empirical temperature data affecting user experience, for example, if the designer determines that the temperature threshold value affecting user experience is 26 degrees according to the empirical temperature data, 26 degrees may be determined as the second preset environment temperature.

Specifically, the controller obtains indoor environment temperatures of rooms in which the idle indoor units in the multi-connected air conditioning system are located, compares the indoor environment temperatures with a second preset environment temperature, and if the indoor environment temperatures are not less than the second preset environment temperature, it is stated that if the idle indoor units are controlled to operate in a heating mode at the moment, the indoor environment temperatures of the idle indoor units are easily caused to continue to increase, discomfort is caused to a user, and user experience is affected. If the indoor environment temperature is lower than the second preset environment temperature, the indoor environment temperature of the idle indoor unit is still in a controllable interval, the idle indoor unit is controlled to operate in a heating mode in the controllable interval, and even if the indoor environment temperature slightly rises, user discomfort cannot be caused.

Consequently, the controller is confirmed as the target heat transfer indoor set with the idle indoor set that indoor ambient temperature is less than second preset ambient temperature, can effectively avoid because the indoor set operation mode of control target heat transfer, leads to the indoor ambient temperature of target heat transfer indoor set to lead to increasing and arouses the uncomfortable condition production of user, has promoted user's use and has experienced.

To better meet the use requirements of users, in one embodiment, the method for determining the target heat exchange indoor unit from the idle indoor units of the multi-connected air conditioning system comprises the following steps: determining a target heat exchange indoor unit from idle indoor units of the multi-connected air conditioning system according to the available tags; the tags can be used to preset based on the importance of the room.

The available label is used for marking the available idle indoor unit. The available tags can be preset based on the importance of the room, the importance of the room can be determined according to the actual requirements of the user, and the user can determine the importance of the room according to the temperature stability requirements of the room. For example, a user may set an important room with the highest temperature stability, such as an important meeting room, as a VIP room, set an available tag for an indoor unit configured in a non-VIP room, and when the indoor unit in the non-VIP room is in an idle state, the indoor unit is an available idle indoor unit.

Specifically, after the controller determines the idle indoor units in the multi-connected air conditioning system according to the running states of the indoor units in the multi-connected air conditioning system, the available idle indoor units provided with available labels in the idle indoor units are determined as the target heat exchange indoor units.

In the embodiment, the available tags are set for the indoor units according to the importance degrees of the rooms, the target heat exchange indoor unit is determined by the controller according to the available tags from the idle indoor units of the multi-connected air-conditioning system, the available tags are set for the indoor units according to the importance degrees of the rooms, the situation that when the multi-connected air-conditioning system meets the ultralow-temperature refrigeration running condition, the idle indoor units of the important rooms are determined to be the target heat exchange indoor units, the air temperature in the important rooms fluctuates due to the fact that the heating mode is operated, and the use experience of users is improved.

Further, in one embodiment, determining a target heat exchange indoor unit from idle indoor units of a multi-type air conditioning system according to the available tags comprises: acquiring idle indoor units of the multi-connected air conditioning system; and determining available labels from the idle indoor units, wherein the idle indoor units with indoor environment temperatures lower than a second preset environment temperature are used as target heat exchange indoor units.

Specifically, the controller acquires idle indoor units of the multi-connected air conditioning system, determines the idle indoor unit provided with the available label from the idle indoor units as the available idle indoor unit, acquires the indoor environment temperature of the available idle indoor units, and takes the available idle indoor unit with the indoor environment temperature less than a second preset environment temperature as the target heat exchange indoor unit.

In this embodiment, the idle indoor set that both has usable label, satisfy the temperature condition again determines as the indoor set of target heat transfer, has also considered user's use impression when satisfying user's user demand, has further promoted user's use experience.

When a plurality of target heat exchange indoor units meeting the requirements exist in the multi-connected air conditioning system, in one embodiment, as shown in fig. 3, the target heat exchange indoor units are controlled to operate in a heating mode, and a refrigerant discharged by a compressor is condensed to release heat, which includes the following steps:

and 302, sequencing the target heat exchange indoor units according to the ascending order of the indoor environment temperature of the target heat exchange indoor units to obtain a target heat exchange indoor unit sequence.

Specifically, the controller arranges the target heat exchange indoor units in an ascending order according to the indoor environment temperature of the target heat exchange indoor units to obtain a target heat exchange indoor unit sequence, and the target heat exchange indoor units are correspondingly arranged in the target heat exchange indoor unit sequence according to the sequence from small indoor temperature to large indoor temperature.

And step 304, determining the number of the target heat exchange indoor units needing to be opened based on the capacity difference value between the total capacity of the heating indoor units and the total capacity of the refrigerating indoor units and the heating capacity of each target heat exchange indoor unit in the target heat exchange indoor unit sequence.

Specifically, the controller calculates the difference value between the total capacity of the heating indoor units and the total capacity of the refrigerating indoor units to obtain the capacity difference value between the total capacity of the heating indoor units and the total capacity of the refrigerating indoor units, and determines the number of target heat exchange indoor units to be started based on the capacity difference value and the heating capacity of each target heat exchange indoor unit in the target heat exchange indoor unit sequence.

It can be understood that, when the number of the target heat exchange indoor units to be turned on is determined, the number of the target heat exchange indoor units to be turned on is calculated sequentially according to the heating capacities of the target heat exchange indoor units in the target heat exchange indoor unit sequence from the first target heat exchange indoor unit in the target heat exchange indoor unit sequence.

And step 306, controlling the target heat exchange indoor units in the sequence of the target heat exchange indoor units, wherein the target heat exchange indoor units in the sequence are sequenced in the front to run a heating mode, and condensing and releasing heat on the refrigerant discharged by the compressor.

Specifically, the controller controls the target heat exchange indoor units in the sequence of the target heat exchange indoor units, wherein the target heat exchange indoor units in the sequence are sequenced in the front to run in a heating mode, and the refrigerant discharged by the compressor is condensed to release heat.

And 308, controlling the multi-connected air conditioning system to enter a complete heat recovery mode until the number of the started target heat exchange indoor units in the target heat exchange indoor unit sequence is equal to the number of the target heat exchange indoor units needing to be started.

If the indoor units in the multi-connected air-conditioning system only operate in a refrigeration mode and do not operate the indoor units in a heating mode, the multi-connected air-conditioning system is in a complete refrigeration mode at the moment, the refrigerant in the complete refrigeration mode flows to the position shown in figure 4, and high-temperature and high-pressure refrigerant is discharged from the compressor.

If a heating indoor unit running in a heating mode and a refrigerating indoor unit running in a refrigerating mode exist in the multi-connected air conditioning system at the same time, the multi-connected air conditioning system has the following two operation modes.

Firstly, a main refrigeration mode is generally an operation mode selected when the total capacity of heating indoor units of the multi-connected air conditioning system is smaller than the total capacity of the refrigeration indoor units, at this time, although heating indoor units or target heat exchange indoor units operating the heating mode and refrigeration indoor units operating the refrigeration mode exist in the multi-connected air conditioning system at the same time, the total capacity of the heating indoor units and the target heat exchange indoor units is smaller than the total capacity of the refrigeration indoor units, the heating indoor units and the target heat exchange indoor units in the multi-connected air conditioning system cannot meet the refrigeration requirements of the refrigeration indoor units, and the multi-connected air conditioning system operates the main refrigeration mode.

The flow direction of the refrigerant in the main refrigeration mode is as shown in fig. 5, the refrigerant with high temperature and high pressure is discharged from the compressor, a part of the refrigerant enters the outdoor heat exchanger through the refrigeration four-way valve for condensation and heat release, and enters the liquid pipe after passing through the heating electronic expansion valve; the other part enters the indoor side through the heating four-way valve and the high-pressure air pipe, enters the heat exchanger of the heating indoor unit or the target heat exchange indoor unit through the mode converter to be condensed and released heat, and then enters the liquid inlet pipe. After the two parts of refrigerants are converged in the liquid pipe, the two parts of refrigerants enter the heat exchanger of the refrigeration indoor unit through the corresponding mode converter of the refrigeration indoor unit to be evaporated and absorb heat, then the refrigerants are converged in the low-pressure gas pipe, enter the gas-liquid separator and finally return to the compressor to complete the whole circulation.

And in the second mode, a complete heat recovery mode is generally an operation mode selected when the total capacity of the heating indoor units of the multi-connected air-conditioning system is not less than the total capacity of the refrigerating indoor units, at the moment, a heating indoor unit or a target heat exchange indoor unit for operating the heating mode and a refrigerating indoor unit for operating the refrigerating mode exist in the multi-connected air-conditioning system at the same time, the total capacity of the heating indoor unit and the target heat exchange indoor unit is not less than the total capacity of the refrigerating indoor units, the heating indoor unit and the target heat exchange indoor unit in the multi-connected air-conditioning system can meet the refrigerating requirement of the refrigerating indoor units, the outdoor heat exchanger at the outdoor side is not required to condense and release heat for the refrigerant, and the multi-connected air-conditioning system operates the complete heat recovery mode.

The flow direction of the refrigerant in the complete heat recovery mode is shown in fig. 6, the high-temperature and high-pressure refrigerant is discharged from the compressor, the refrigerant completely enters the indoor side through the heating four-way valve and the high-pressure air pipe, then enters the target heat exchange indoor unit heat exchanger and/or the heating indoor unit heat exchanger through the mode converter to be condensed and released heat, the condensed refrigerant is converged into the liquid inlet pipe, then enters the refrigerating indoor unit heat exchanger through the mode converter to be evaporated and absorbed heat, then is converged into the low-pressure air pipe, enters the gas-liquid separator and finally returns to the compressor to complete the whole cycle.

Specifically, the number of target heat exchange indoor units to be turned on is calculated according to the capacity difference and the heating capacity of each target heat exchange indoor unit in the target heat exchange indoor unit sequence, so that when the number of the target heat exchange indoor units to be turned on by the controller is equal to the number of the target heat exchange indoor units to be turned on, the total capacity of the heating indoor units in the multi-connected air conditioning system is considered to be not less than the total capacity of the refrigerating indoor units, the heating indoor units and the target heat exchange indoor units in the multi-connected air conditioning system can meet the refrigerating requirement of the refrigerating indoor units at the moment, the outdoor heat exchanger on the outdoor side is not required to condense and release heat for the refrigerant, the multi-connected air conditioning system runs in a complete heat recovery mode, and the controller controls the current multi-connected air conditioning system to continuously run in the complete heat recovery mode.

In the implementation, the controller performs difference calculation according to the total capacity of the heating indoor units and the total capacity of the refrigerating indoor units to obtain the capacity difference value between the total capacity of the heating indoor units and the total capacity of the refrigerating indoor units, determines the number of target heat exchange indoor units needing to be started based on the capacity difference value and the heating capacity of each target heat exchange indoor unit in the target heat exchange indoor unit sequence, and can accurately control the multi-connected air conditioning unit to run in a complete heat recovery mode through the target indoor heat exchange machines which are arranged in the front and are started in the target heat exchange indoor unit sequence, wherein the number of the target heat exchange indoor units needing to be started is equal to the number of the target heat exchange indoor units needing to be started, so that unnecessary resource waste caused by too many target heat exchange indoor units are avoided.

The controller controls the target heat exchange indoor unit to operate in a heating mode to provide refrigerating energy for the refrigerating indoor unit, and meanwhile, the controller inevitably influences the indoor temperature of the target heat exchange indoor unit.

Based on this, in one embodiment, the controller, after controlling the target heat exchange indoor unit to operate the heating mode and condensing and releasing heat to the refrigerant discharged from the compressor, further includes: and after the multi-connected air conditioning system runs for a preset time, returning to the step of acquiring the total capacity of the heating indoor units running in the heating mode and the total capacity of the refrigerating indoor units running in the refrigerating mode in the multi-connected air conditioning system.

The preset time is the stable time required for the operation of the multi-connected air conditioning system to reach the stable state after the multi-connected air conditioning system is adjusted, and the multi-connected air conditioning system can reach the stable state again only after the controller controls the target heat exchange indoor unit to operate in the heating mode and needs to operate for the preset time.

Specifically, after the controller controls the target heat exchange indoor units with the number equal to that of the target heat exchange indoor units to be started and operates for a preset time, the multi-connected air conditioning system is stabilized from an adjusted state, and the controller returns to the step of operating to obtain the total capacity of the heating indoor units in the heating mode and the total capacity of the refrigerating indoor units in the refrigerating mode in the multi-connected air conditioning system again, so that capacity detection is performed again, and ultra-low temperature refrigeration control is performed on the multi-connected air conditioning system dynamically.

In one embodiment, if the total capacity of the target heat exchange indoor units in the target heat exchange indoor unit sequence is smaller than the capacity difference value, the controller controls all the target heat exchange indoor units in the target heat exchange indoor unit sequence to be turned on, and the main body cooling mode is kept running.

In one embodiment, as shown in fig. 7, the method for controlling the target heat exchange indoor unit to operate in the heating mode and condensing the refrigerant discharged from the compressor to release heat includes the following steps:

and 702, sequencing the target heat exchange indoor units according to the ascending order of the indoor environment temperature of the target heat exchange indoor units to obtain a target heat exchange indoor unit sequence.

Specifically, the embodiment of step 702 is substantially the same as that of step 302, and is not described herein again. .

And 704, controlling a first target heat exchange indoor unit in the target heat exchange indoor unit sequence to operate in a heating mode, and condensing and releasing heat of a refrigerant discharged by the compressor.

And the first target heat exchange indoor unit in the target heat exchange indoor unit sequence is the target heat exchange indoor unit with the lowest indoor environment temperature in the target heat exchange indoor unit sequence.

Specifically, the controller controls a first target heat exchange indoor unit in the target heat exchange indoor unit sequence to operate in a heating mode, and the first target heat exchange indoor unit is used for condensing and releasing heat of a refrigerant discharged by the compressor.

Step 706, if the total capacity of the heating indoor units in the multi-connected air conditioning system is smaller than the total capacity of the refrigerating indoor units after the multi-connected air conditioning system is operated for the preset time, controlling the next target heat exchange indoor unit in the target heat exchange indoor unit sequence to operate the heating mode, and condensing and discharging the refrigerant discharged by the compressor.

Specifically, the controller controls a first target heat exchange indoor unit in the target heat exchange indoor unit sequence to operate in a heating mode, after the multi-connected air conditioning system operates for a preset time, the controller obtains the total capacity of the heating indoor units and the total capacity of the refrigerating indoor units in the multi-connected air conditioning system in real time, if the total capacity of the heating indoor units is smaller than the total capacity of the refrigerating indoor units, it is indicated that only the first target heat exchange indoor unit is started, the heating indoor units in the multi-connected air conditioning system still cannot meet the refrigerating requirement of the refrigerating indoor units, and the controller controls a next target heat exchange indoor unit in the target heat exchange indoor unit sequence to operate in the heating mode to condense and release heat for a refrigerant discharged by a compressor.

In this embodiment, the controller acquires the total capacity of the heating indoor units and the total capacity of the cooling indoor units in the multi-connected air conditioning system after the multi-connected air conditioning system operates for a preset time, and determines whether a new target heat exchange indoor unit needs to be continuously started, so that the situation that determination errors and running resources are wasted due to determination performed according to the total capacity of the heating indoor units and the total capacity of the cooling indoor units in the multi-connected air conditioning system when the multi-connected air conditioning system does not stably operate can be avoided.

In one embodiment, if the total capacity of the heating indoor units in the multi-connected air-conditioning system is smaller than the total capacity of the refrigerating indoor units after the multi-connected air-conditioning system is operated for a preset time, and no idle indoor unit which can be used as a target heat exchange indoor unit exists in the current multi-connected air-conditioning system, the controller controls the multi-connected air-conditioning system to keep the current operation state to operate, monitors the operation state of the indoor units in the multi-connected air-conditioning system in real time, and returns to execute the step of obtaining the total capacity of the heating indoor units in the heating mode and the total capacity of the refrigerating indoor units in the refrigerating mode in the multi-connected air-conditioning system when a newly added idle indoor unit exists.

Based on this, in one embodiment, the controller, after controlling the target heat exchange indoor unit to operate the heating mode and condensing and releasing heat to the refrigerant discharged from the compressor, further includes: and when the indoor environment temperature of the target heat exchange indoor unit running in the heating mode is higher than the second preset environment temperature, controlling the target heat exchange indoor unit to stop running in the heating mode, and returning to the step of acquiring the total capacity of the heating indoor units running in the heating mode and the total capacity of the refrigerating indoor units running in the refrigerating mode in the multi-connected air conditioning system.

Specifically, the controller controls the target heat exchange indoor unit to operate in a heating mode, after a refrigerant discharged by the compressor is condensed and released, the ambient temperature of the indoor environment where the target heat exchange indoor unit is located needs to be monitored in real time, when the indoor ambient temperature of the target heat exchange indoor unit in the heating mode is greater than the second preset ambient temperature, the controller needs to immediately control the target heat exchange indoor unit to stop operating in the heating mode, the situation that the ambient temperature of the indoor environment where the target heat exchange indoor unit is located is too high due to the fact that the target heat exchange indoor unit is located in the continuous operation heating mode is avoided, a user feels uncomfortable, and user experience is affected.

The method comprises the steps that the operation heating mode of a target heat exchange indoor unit with overhigh indoor environment temperature is controlled, the controller needs to return to the step of obtaining the total capacity of the heating indoor units operating in the heating mode and the total capacity of the refrigerating indoor units operating in the refrigerating mode in the multi-connected air-conditioning system again, whether other idle indoor units need to be controlled again to operate in the heating mode in the current multi-connected air-conditioning system is judged again, and whether idle indoor units capable of being used as the target heat exchange indoor units exist in the current multi-connected air-conditioning system is judged again.

In this embodiment, the controller is through the ambient temperature of the indoor environment that real-time detection target heat transfer indoor set is located, when the indoor ambient temperature of the target heat transfer indoor set of operation mode of heating was greater than the preset ambient temperature of second, the controller need control target heat transfer indoor set stop operation mode of heating at once, avoids because the mode of heating of continuous operation leads to the ambient temperature of the indoor environment that target heat transfer indoor set is located too high, makes the user produce uncomfortable condition and takes place, has further promoted user's use and has experienced.

In one embodiment, as shown in fig. 8, a method for controlling ultra-low temperature refrigeration in a multi-type air conditioning system is provided, which specifically includes the following steps:

firstly, the controller acquires the outdoor environment temperature t of the area where the multi-connected air conditioning system is located _{Outer cover} When the outdoor environment temperature t of the multi-connected air conditioning system _{Outer cover} Less than a first predetermined ambient temperature t ₁ And then acquiring the running state of each indoor unit in the multi-connected air-conditioning system, determining whether a refrigerating indoor unit running in a refrigerating mode exists according to the running state of each indoor unit, and acquiring the total capacity C of a heating indoor unit running in a heating mode in the multi-connected air-conditioning system if the refrigerating indoor unit running in the refrigerating mode exists _{Heating apparatus} Total capacity C of indoor refrigerating unit in refrigerating mode _{Refrigeration system} If total capacity C of the heating indoor unit _{Heating apparatus} Not less than total capacity C of indoor unit _{Refrigeration system} If the multi-connected air conditioning system is in the complete heat recovery mode, the risk of frequently triggering anti-freezing protection is avoided, and the controller controls the multi-connected air conditioning system to keep the current operation mode to continue to operate.

If total capacity C of heating indoor unit _{Heating apparatus} Less than the total capacity C of the indoor refrigerating unit _{Refrigeration system} And the controller determines an idle indoor unit in the multi-connected air conditioning system according to the running state of each indoor unit in the multi-connected air conditioning system, and determines the idle indoor unit provided with the available label as an available idle indoor unit. Obtaining the indoor environment temperature t of the indoor environment where the available idle indoor unit is located _{Inner part} Will be the indoor ambient temperature t _{Inner part} Less than a second predetermined ambient temperature t ₂ The available idle indoor unit is determined as the target heat exchange indoor unit.

According to the indoor ambient temperature t of the target heat exchange indoor unit _{Inner part} And (4) performing ascending arrangement on the target indoor heat exchange machines to obtain a target indoor heat exchange machine sequence. Based on total capacity C of heating indoor unit _{Heating apparatus} And total capacity C of indoor unit _{Refrigeration system} Capacity difference value C of _{Difference between} And the heating capacity c of each target heat exchange indoor unit in the target heat exchange indoor unit sequence, and determining the quantity Q of the target heat exchange indoor units needing to be started _{Need to} 。

Controlling the target heat exchange chamber arranged in front of the target heat exchange chamber in the sequenceThe machine runs in a heating mode until the quantity Q of the opened target indoor heat exchangers in the sequence of the target heat exchange indoor machines _Target The number Q of the target heat exchange indoor units needing to be opened _{Need to} And when the difference is equal, controlling the multi-connected air conditioning system to enter a complete heat recovery mode.

If the total heating capacity c of the indoor heat exchanger is targeted _{General assembly} Less than the capacity difference C _{Difference (D)} And controlling all target heat exchange indoor units in the target heat exchange indoor unit sequence to be started, and controlling the multi-connected air conditioning system to enter a main body refrigeration mode.

When the adjusted multi-connected air-conditioning system operates for a preset time, the operation returns to the step of obtaining the total capacity C of the heating indoor units in the multi-connected air-conditioning system _{Heating apparatus} And total capacity C of the refrigerating indoor unit _{Refrigeration} The step (2).

While controlling the heating mode of the target heat exchange indoor unit, the controller can monitor the indoor environment temperature t of the indoor environment where the target heat exchange indoor unit is located in real time _{Inner part} If the indoor ambient temperature t of the target heat exchange indoor unit is monitored _{Inner part} Greater than a second predetermined ambient temperature t ₂ The controller immediately controls the target heat exchange indoor unit to stop operating the heating mode and returns to obtain the total capacity C of the heating indoor unit operating the heating mode in the multi-connected air-conditioning system _{Heating apparatus} Total capacity C of indoor refrigerating unit in refrigerating mode _{Refrigeration} Step (2).

In the ultralow-temperature refrigeration control method for the multi-split air conditioning system in the embodiment, the idle indoor unit in the heat recovery multi-split air conditioning system is used as the condenser, so that the refrigerant bypasses the outdoor low-temperature environment and directly enters the indoor unit side, the pipe temperature of the refrigeration indoor unit is increased, the frequent occurrence of anti-freezing protection of the refrigeration indoor unit due to the excessively low pipe temperature is avoided, and the use experience of a user is improved.

It should be understood that, although the steps in the flowcharts related to the embodiments as described above are sequentially displayed as indicated by arrows, the steps are not necessarily performed sequentially as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a part of the steps in the flowcharts related to the embodiments described above may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the execution order of the steps or stages is not necessarily sequential, but may be rotated or alternated with other steps or at least a part of the steps or stages in other steps.

Based on the same inventive concept, the embodiment of the application also provides the multi-connected air conditioning system ultralow-temperature refrigeration control device for realizing the multi-connected air conditioning system ultralow-temperature refrigeration control method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the method, so the specific limitations in one or more embodiments of the ultralow-temperature refrigeration control device for the multi-connected air conditioning system provided below can be referred to the limitations on the ultralow-temperature refrigeration control method for the multi-connected air conditioning system, and are not described again here.

In one embodiment, as shown in fig. 9, there is provided an ultra-low temperature refrigeration control device 900 of a multi-type air conditioning system, comprising: capacity acquisition module 901, target heat exchange indoor unit determining module 902 and control module 903, wherein:

the capacity obtaining module 901 is configured to obtain a total capacity of heating indoor units in a heating mode and a total capacity of cooling indoor units in a cooling mode in the multi-connected air conditioning system when an outdoor environment temperature of the multi-connected air conditioning system is less than a first preset environment temperature.

And a target heat exchange indoor unit determining module 902, configured to determine a target heat exchange indoor unit from idle indoor units of the multi-connected air conditioning system if the total heating indoor unit capacity is smaller than the total cooling indoor unit capacity.

And the control module 903 is used for controlling the target heat exchange indoor unit to operate in a heating mode, and condensing and releasing heat for the refrigerant discharged by the compressor.

According to the ultralow-temperature refrigeration control device of the multi-connected air conditioning system, when the outdoor environment temperature of the multi-connected air conditioning system is lower than the first preset environment temperature, the outdoor environment of the multi-connected air conditioning system is in the ultralow-temperature environment, the total capacity of the heating indoor units running in the heating mode and the total capacity of the refrigerating indoor units running in the refrigerating mode in the multi-connected air conditioning system are obtained, if the total capacity of the heating indoor units is lower than the total capacity of the refrigerating indoor units, it is indicated that the heating indoor units in the multi-connected air conditioning system cannot meet the refrigeration requirement of the refrigerating indoor units, at least one part of refrigerants flowing through the refrigerating indoor units in the existing multi-connected air conditioning system come from an outdoor unit heat exchanger, and the indoor units are easy to start anti-freezing protection frequently. The target heat exchange indoor unit is determined from the idle indoor unit of the multi-split air-conditioning system, the operation heating mode of the target heat exchange indoor unit is controlled, and the refrigerant discharged by the compressor in the multi-split air-conditioning system is condensed to release heat, so that the refrigerant flowing through the refrigeration indoor unit does not need to pass through the outdoor heat exchanger in the ultralow temperature environment, the indoor unit can be effectively prevented from frequently entering anti-freezing protection, and the use experience of a user is improved.

In one embodiment, the target heat exchange indoor unit determination module is further configured to: acquiring the indoor environment temperature of each idle indoor unit in the multi-connected air conditioning system; and taking the idle indoor unit with the indoor environment temperature lower than the second preset environment temperature as the target heat exchange indoor unit.

In one embodiment, the target heat exchange indoor unit determination module is further configured to: determining a target heat exchange indoor unit from idle indoor units of the multi-connected air conditioning system according to the available tags; the availability of tags is preset based on the importance of the room.

In one embodiment, the target heat exchange indoor unit determination module is further configured to: acquiring idle indoor units of the multi-connected air conditioning system; and determining available labels from the idle indoor units, wherein the idle indoor units with indoor environment temperatures lower than a second preset environment temperature are used as target heat exchange indoor units.

In one embodiment, the control module is further configured to: sequencing all the target heat exchange indoor units according to the ascending sequence of the indoor environment temperature of the target heat exchange indoor units to obtain a target heat exchange indoor unit sequence; controlling a first target heat exchange indoor unit in the target heat exchange indoor unit sequence to operate in a heating mode, and condensing and releasing heat on a refrigerant discharged by a compressor; and if the total capacity of the heating indoor units in the multi-connected air conditioning system is smaller than the total capacity of the refrigerating indoor units after the multi-connected air conditioning system runs for the preset time, controlling the next target heat exchange indoor unit in the target heat exchange indoor unit sequence to run in a heating mode, and condensing and releasing heat for the refrigerant discharged by the compressor.

In one embodiment, the multi-connected air conditioning system ultra-low temperature refrigeration control device further comprises: and the complete heat recovery mode operation module is used for controlling the multi-connected air conditioning system to enter a complete heat recovery mode when the total capacity of the heating indoor units in the multi-connected air conditioning system is not less than the total capacity of the refrigerating indoor units.

In one embodiment, the multi-connected air conditioning system ultra-low temperature refrigeration control device further comprises: and the target heat exchange indoor unit closing module is used for controlling the target heat exchange indoor unit to stop running the heating mode when the indoor environment temperature of the target heat exchange indoor unit running the heating mode is greater than a second preset environment temperature, and returning to the step of acquiring the total capacity of the heating indoor units running the heating mode and the total capacity of the refrigerating indoor units running the refrigerating mode in the multi-connected air conditioning system.

In one embodiment, the control module is further configured to: and controlling an electronic expansion valve of the target heat exchange indoor unit to be opened, operating the fan at a preset gear, opening a heating electromagnetic valve corresponding to the mode converter, and closing a refrigerating electromagnetic valve of the mode converter.

All or part of the modules in the ultralow-temperature refrigeration control device of the multi-connected air conditioning system can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent of a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.

In one embodiment, a computer device is provided, which may be a controller in a multi-connected air conditioning system, and the internal structure thereof may be as shown in fig. 10. The computer device includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the computer equipment is used for storing data such as the external environment temperature, the first preset environment temperature, the total capacity of the heating indoor unit, the total capacity of the refrigerating indoor unit and the like. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by the processor to realize the ultralow temperature refrigeration control method of the multi-connected air conditioning system.

Those skilled in the art will appreciate that the architecture shown in fig. 10 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.

In one embodiment, a computer device is provided, which includes a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the specific steps in the above-mentioned multi-type air conditioning system ultra-low temperature refrigeration control method embodiment.

In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, which when executed by a processor implements the specific steps in the above-described multi-type air conditioning system ultra-low temperature refrigeration control method embodiment.

In one embodiment, a computer program product is provided, which includes a computer program, when being executed by a processor, the computer program implementing the specific steps of the above-mentioned multi-type air conditioning system ultra-low temperature refrigeration control method embodiment.

It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) referred to in the present application are information and data authorized by the user or sufficiently authorized by each party.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, databases, or other media used in the embodiments provided herein can include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high-density embedded nonvolatile Memory, resistive Random Access Memory (ReRAM), magnetic Random Access Memory (MRAM), ferroelectric Random Access Memory (FRAM), phase Change Memory (PCM), graphene Memory, and the like. Volatile Memory can include Random Access Memory (RAM), external cache Memory, and the like. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others. The databases referred to in various embodiments provided herein may include at least one of relational and non-relational databases. The non-relational database may include, but is not limited to, a block chain based distributed database, and the like. The processors referred to in the various embodiments provided herein may be, without limitation, general purpose processors, central processing units, graphics processors, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, or the like.

All possible combinations of the technical features in the above embodiments may not be described for the sake of brevity, but should be considered as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, and these are all within the scope of protection of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. An ultralow-temperature refrigeration control method for a multi-connected air conditioning system is characterized by comprising the following steps:

when the outdoor environment temperature of the multi-connected air-conditioning system is lower than a first preset environment temperature, acquiring the total capacity of heating indoor units running in a heating mode and the total capacity of refrigerating indoor units running in a refrigerating mode in the multi-connected air-conditioning system;

2. The method of claim 1, wherein determining a target heat exchange indoor unit from idle indoor units of the multi-connected air conditioning system comprises:

3. The method of claim 1, wherein determining a target heat exchange indoor unit from idle indoor units of the multi-connected air conditioning system comprises:

determining a target heat exchange indoor unit from idle indoor units of the multi-connected air conditioning system according to the available tags; the availability tags are preset based on the importance of the room.

4. The method of claim 3, wherein said determining a target heat exchange indoor unit from an idle indoor unit of the multi-connected air conditioning system based on the availability tag comprises:

acquiring an idle indoor unit of the multi-connected air conditioning system;

and determining the idle indoor units which have the available labels and have indoor environment temperatures lower than a second preset environment temperature from the idle indoor units as target heat exchange indoor units.

5. The method as claimed in any one of claims 2 or 4, wherein if there are a plurality of target heat exchange indoor units, the controlling the target heat exchange indoor units to operate in a heating mode, and the refrigerant discharged from the compressor performs condensation heat release comprises:

6. The method of claim 5, further comprising:

and after the multi-connected air conditioning system runs for a preset time, returning to the step of acquiring the total capacity of the heating indoor units running in the heating mode and the total capacity of the refrigerating indoor units running in the refrigerating mode in the multi-connected air conditioning system.

7. The method according to any one of claims 2 or 4, wherein after the step of controlling the target heat exchange indoor unit to operate in the heating mode and condensing the refrigerant discharged from the compressor to release heat, the method further comprises:

and when the indoor environment temperature of the target heat exchange indoor unit running in the heating mode is higher than the second preset environment temperature, controlling the target heat exchange indoor unit to stop running in the heating mode, and returning to the step of acquiring the total capacity of the heating indoor units running in the heating mode and the total capacity of the refrigerating indoor units running in the refrigerating mode in the multi-connected air conditioning system.

8. The method of claim 1, wherein controlling the target heat exchange indoor unit to operate in a heating mode comprises:

9. An ultra-low temperature refrigeration control device of a multi-connected air conditioning system is characterized by comprising:

the system comprises a capacity acquisition module, a capacity judging module and a capacity judging module, wherein the capacity acquisition module is used for acquiring the total capacity of heating indoor units running in a heating mode and the total capacity of refrigerating indoor units running in a refrigerating mode in a multi-connected air-conditioning system when the outdoor environment temperature of the multi-connected air-conditioning system is lower than a first preset environment temperature;

and the control module is used for controlling the target heat exchange indoor unit to operate in a heating mode and condensing and releasing heat of a refrigerant discharged by the compressor.

10. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method of any of claims 1 to 8.

11. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 8.

12. A computer program product comprising a computer program, characterized in that the computer program realizes the steps of the method of any one of claims 1 to 8 when executed by a processor.