Control method of air conditioning system and air conditioning system

Abstract

The invention relates to the technical field of air conditioners, in particular to a control method of an air conditioning system and the air conditioning system. The air conditioning system comprises a plurality of indoor units installed in a combined mode, each indoor unit comprises an indoor unit heat exchanger, and a refrigerant flow adjusting valve is arranged on a refrigerant inlet pipe of each indoor unit heat exchanger; the control method of the air conditioning system mainly comprises the steps that when the air conditioning system operates in a heating mode, the indoor environment temperature Tin and the target inlet pipe temperature of the area where an indoor unit is located are obtained; when Tin is smaller than Tin 1, the target inlet pipe temperature of the indoor unit is increased; wherein Tin1 is an indoor target temperature set by a user; the inlet pipe temperature Tci of the indoor unit is obtained; and when the Tci is smaller than the target inlet pipe temperature, the opening degree of a refrigerant flow adjusting valve of the indoor unit is increased. According to the method, the target inlet pipe temperature of each indoor unit is dynamically adjusted, the temperature requirement of a user is considered, the target inlet pipe temperature increasing and the refrigerant flow flowing into the indoor units are combined, and the heating capacity of the indoor units with the large height difference is jointly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly provides a control method for an air conditioner system and an air conditioner system. Background Art

[0002] When multiple indoor units in a multi-connected air conditioner system are in heating operation simultaneously, due to the different positions of the indoor units, there are different height differences between the indoor units and the outdoor unit, resulting in a relatively small refrigerant flow rate in the indoor unit with a larger height difference from the outdoor unit, and further resulting in poor heating effect of this indoor unit. The prior art increases the refrigerant flow rate in the indoor unit with a larger height difference from the outdoor unit to improve the heating effect of this indoor unit. However, during actual operation, due to the change in the heating demand of users, the opening degree of the refrigerant flow regulating valve on the refrigerant inlet pipe of the indoor unit cannot be adjusted according to the heating demand of users, resulting in poor heating effect of the indoor unit with a larger height difference.

[0003] Correspondingly, there is a need in the art for a new control method for an air conditioner system to solve the problem of poor heating effect of the indoor unit with a larger height difference from the outdoor unit in the existing air conditioner system. Summary of the Invention

[0004] The present invention aims to solve the above technical problems, that is, to solve the problem of poor heating effect of the indoor unit with a larger height difference from the outdoor unit in the existing air conditioner system.

[0005] The present invention provides a control method for an air conditioner system. The air conditioner system of the present invention includes a plurality of indoor units assembled together. The indoor unit includes an indoor unit heat exchanger, and a refrigerant flow regulating valve is provided on the refrigerant inlet pipe of the indoor unit heat exchanger for regulating the refrigerant flow rate entering the indoor unit heat exchanger. The control method includes:

[0006] When the air conditioner system is in heating operation, obtain the indoor environmental temperature Tin and the target inlet pipe temperature of the area where the indoor unit is located;

[0007] When Tin < Tin1, increase the target inlet pipe temperature of the indoor unit; where Tin1 is the indoor target temperature set by the user;

[0008] Obtain the inlet pipe temperature Tci of the indoor unit;

[0009] When Tci < the target inlet pipe temperature, increase the opening degree of the refrigerant flow regulating valve of the indoor unit.

[0010] In a preferred technical solution of the above control method for an air conditioner system, the step of "obtaining the target inlet pipe temperature of the indoor unit" further includes:

[0011] Obtain the pre-stored target inlet pipe temperature according to the difference between the outdoor environmental temperature and the indoor environmental temperature Tin of the indoor unit.

[0012] In the preferred technical solution of the control method of the above air-conditioning system, the step of "obtaining the pre-stored target inlet pipe temperature according to the difference between the outdoor ambient temperature and the indoor ambient temperature Tin of the indoor unit" further includes:

[0013] When the difference between the outdoor ambient temperature and the indoor ambient temperature Tin of the indoor unit is the first difference, the target inlet pipe temperature is the first target inlet pipe temperature;

[0014] When the difference between the outdoor ambient temperature and the indoor ambient temperature Tin of the indoor unit is the second difference, the target inlet pipe temperature is the second target inlet pipe temperature;

[0015] Wherein, the first difference > the second difference, and the first target inlet pipe temperature > the second target inlet pipe temperature.

[0016] In the preferred technical solution of the control method of the above air-conditioning system, after the step of "obtaining the indoor ambient temperature Tin and the target inlet pipe temperature of the area where the indoor unit is located when the air-conditioning system is in heating operation", the control method includes:

[0017] When Tin ≥ Tin1, the target inlet pipe temperature of the indoor unit remains unchanged.

[0018] In the preferred technical solution of the control method of the above air-conditioning system, after the step of "obtaining the inlet pipe temperature Tci of the indoor unit", the control method includes:

[0019] When Tci > the target inlet pipe temperature, the opening degree of the refrigerant flow regulating valve of the indoor unit is reduced.

[0020] In the preferred technical solution of the control method of the above air-conditioning system, the step of "when Tci < the target inlet pipe temperature, the opening degree of the refrigerant flow regulating valve of the indoor unit is increased" further includes:

[0021] When Tci < the target inlet pipe temperature value, the opening degree of the refrigerant flow regulating valve of the indoor unit is increased and the fan speed of the indoor unit is increased.

[0022] In the preferred technical solution of the control method of the above air-conditioning system, the step of "when Tci > the target inlet pipe temperature, the opening degree of the refrigerant flow regulating valve of the indoor unit is reduced" further includes:

[0023] When Tci > the target inlet pipe temperature, the opening degree of the refrigerant flow regulating valve of the indoor unit is reduced and the fan speed of the indoor unit is reduced.

[0024] In the preferred technical solution of the control method of the air-conditioning system, after the step of “obtaining the inlet pipe temperature Tci of the indoor unit”, the control method includes:

[0025] When Tci=target inlet pipe temperature, the opening of the refrigerant flow regulating valve of the indoor unit is kept unchanged.

[0026] In the preferred technical solution of the control method of the air-conditioning system, the step of "when Tci = target inlet pipe temperature, maintaining the opening of the refrigerant flow control valve of the indoor unit unchanged" further includes:

[0027] When Tci=target inlet pipe temperature, the opening of the refrigerant flow regulating valve of the indoor unit and the fan speed of the indoor unit are kept unchanged.

[0028] The present invention also provides an air-conditioning system, which includes a memory and a processor, wherein the memory is suitable for storing multiple program codes, and the program codes are suitable for being loaded and run by the processor to execute the control method of the air-conditioning system described in any of the above technical solutions.

[0029] It will be understood by those skilled in the art that the air-conditioning system of the present invention includes a plurality of indoor units installed in combination, the indoor unit includes an indoor unit heat exchanger, and a refrigerant flow regulating valve is provided on the refrigerant inlet pipe of the indoor unit heat exchanger, which is used to regulate the refrigerant flow entering the indoor unit heat exchanger; the control method of the air-conditioning system mainly includes the following steps: when the air-conditioning system is in heating operation, the indoor ambient temperature Tin and the target inlet pipe temperature of the area where the indoor unit is located are obtained; when Tin is less than Tin1, the target inlet pipe temperature of the indoor unit is increased; wherein Tin1 is the indoor target temperature set by the user; the inlet pipe temperature Tci of the indoor unit is obtained; when Tci is less than the target inlet pipe temperature, the opening of the refrigerant flow regulating valve of the indoor unit is increased.

[0030] Under the above technical solution, when the air-conditioning system is in heating operation, the indoor ambient temperature Tin and the target inlet pipe temperature of the indoor unit are obtained. When the indoor ambient temperature is lower than the indoor target temperature set by the user, the target inlet pipe temperature is increased. Increasing the target inlet pipe temperature can improve the heating effect of the indoor unit. If the inlet pipe temperature of an indoor unit is lower than the target inlet pipe temperature, it means that the height difference between the indoor unit and the outdoor unit is large, and the refrigerant flow rate entering the indoor unit is small. Therefore, by increasing the opening of the refrigerant flow regulating valve of the indoor unit, the refrigerant flow rate flowing into the indoor unit is increased, thereby further improving the heating effect. The present invention dynamically adjusts the target inlet pipe temperature of each indoor unit according to the actual temperature requirements of the user. When the indoor unit with a large height difference does not reach the user-set temperature, by combining increasing the target inlet pipe temperature with increasing the refrigerant flow rate flowing into the indoor unit, not only the heating capacity of the indoor unit with a large height difference is improved, but also the temperature requirements of the user are taken into account, so that the room with low room temperature is quickly heated up. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0032] Figure 1 This is a flow chart of the main steps of the control method of the air conditioning system of the present invention;

[0033] Figure 2 It is a flowchart of the specific steps of an embodiment of the control method of the air-conditioning system of the present invention. DETAILED DESCRIPTION

[0034] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely intended to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art may adjust them as needed to suit specific applications. Although the control method of the present invention is described in conjunction with a multi-split air conditioning system, the control method of the present invention may also be applied to other air conditioning systems, and those skilled in the art may set the application target as needed.

[0035] It should be noted that, in the description of the present invention, the terms “first” and “second” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0036] Specifically, the air conditioning system of the present invention includes an outdoor unit, multiple indoor units, and a refrigerant circulation loop disposed between the indoor and outdoor units. Each indoor unit includes an indoor heat exchanger and an indoor fan, while the outdoor unit includes an outdoor heat exchanger, an outdoor fan, and a variable-frequency compressor. The indoor heat exchanger, outdoor heat exchanger, and variable-frequency compressor are all disposed within the refrigerant circulation loop. Refrigerant circulates between the indoor and outdoor areas through the refrigerant circulation loop, exchanging heat with the indoor environment through the indoor units, thereby meeting the user's heat exchange needs. A refrigerant flow control valve is disposed on the refrigerant inlet pipe between the compressor and the indoor heat exchanger to regulate the refrigerant flow entering the indoor heat exchanger. The indoor fan is used to blow heat from the indoor heat exchanger into the room, accelerating temperature regulation. The outdoor fan is used to dissipate heat from the outdoor unit and accelerate air flow. During use, the user can control the operation of the air conditioning system by setting the temperature. Those skilled in the art will understand that the present invention does not impose any restrictions on the specific structure of the air-conditioning system. Technicians can set the specific structure of the air-conditioning system according to actual usage requirements. Such changes in specific application objects do not deviate from the basic principles of the present invention and fall within the scope of protection of the present invention.

[0037] Further, the air conditioning system further includes an indoor unit inlet pipe temperature sensor, an outdoor ambient temperature sensor, an indoor ambient temperature sensor, and a controller. The indoor inlet pipe temperature sensor is used to detect the temperature of the refrigerant inlet pipe of the indoor unit heat exchanger (i.e., the inlet pipe temperature Tci in the following text), but no restrictions are imposed on the installation position of the indoor inlet pipe temperature sensor, and those skilled in the art can set it according to their needs. The outdoor ambient temperature sensor is used to detect the outdoor ambient temperature, and the indoor ambient temperature sensor is used to detect the indoor ambient temperature. Similarly, the present invention does not impose any restrictions on the installation positions of the outdoor ambient temperature sensor and the indoor ambient temperature sensor, and those skilled in the art can set them according to their needs. The controller can obtain the inlet pipe temperature, outdoor ambient temperature, and indoor ambient temperature of the indoor unit, and the controller can also control the operating state of the air conditioning system, such as controlling the opening degree of the refrigerant flow regulating valve of each indoor unit, the rotational speed of the indoor unit fan, and so on.

[0038] Those skilled in the art can understand that the present invention does not impose any restrictions on the specific structure and model of the controller, and technicians can set the structure and model of the controller according to actual usage requirements.

[0039] As Figure 1 shown, to solve the problem of poor heating effect of indoor units with a large elevation difference from the outdoor unit in the existing air conditioning system, the air conditioning system of the present invention includes a plurality of indoor units installed in combination. The indoor unit includes an indoor unit heat exchanger, and a refrigerant flow regulating valve is provided on the refrigerant inlet pipe of the indoor unit heat exchanger, which is used to adjust the refrigerant flow rate entering the indoor unit heat exchanger;

[0040] The control method of the air conditioning system mainly includes the following steps:

[0041] Step S10: When the air conditioning system is in heating operation, obtain the indoor ambient temperature Tin and the target inlet pipe temperature in the area where the indoor unit is located;

[0042] Step S20: When Tin < Tin1, increase the target inlet pipe temperature of the indoor unit; where Tin1 is the indoor target temperature set by the user;

[0043] Step S30: Obtain the inlet pipe temperature Tci of the indoor unit;

[0044] Step S40: When Tci < the target inlet pipe temperature, increase the opening degree of the refrigerant flow regulating valve of the indoor unit.

[0045] When the air - conditioning system is in heating operation, obtain the indoor environmental temperature and the target inlet pipe temperature of each indoor unit. When the indoor environmental temperature is lower than the indoor target temperature set by the user, increase the target inlet pipe temperature. A higher target inlet pipe temperature can improve the heating effect of this indoor unit. If the inlet pipe temperature of the indoor unit is less than the target inlet pipe temperature, it indicates that the height difference between the indoor unit and the outdoor unit is relatively large, and the refrigerant flow rate entering the indoor unit is small. Therefore, by increasing the opening degree of the refrigerant flow rate regulating valve of the indoor unit, increase the refrigerant flow rate flowing into this indoor unit to improve the heating effect. If the inlet pipe temperature of the indoor unit is greater than the target inlet pipe temperature, then reduce the opening degree of the refrigerant flow rate regulating valve of the indoor unit. In the case where the height differences of the indoor units are inconsistent, it can not only ensure the heating effect of the indoor unit with a large height difference but also achieve the balance of the heating capacities of each indoor unit.

[0046] The present invention dynamically adjusts the target inlet pipe temperature of each indoor unit according to the actual temperature requirements of the user. When the indoor unit with a large height difference fails to reach the temperature set by the user, by combining the increase of the target inlet pipe temperature and the increase of the refrigerant flow rate flowing into the indoor unit, it not only improves the heating capacity of the indoor unit with a large height difference but also takes into account the temperature requirements of the user, enabling the room with a low room temperature to quickly warm up and enhancing the user experience.

[0047] The target inlet pipe temperature can be a fixed value or a numerical range. Its specific value can be obtained through experimental data based on the difference between the outdoor environmental temperature and the indoor environmental temperature, or can be obtained through experimental data according to the operating conditions of the air - conditioning system, or can also be obtained based on an empirical formula, and the target inlet pipe temperature is pre - stored in the memory in one - to - one correspondence. Or the target inlet pipe temperature can also be obtained in a way set by the user, etc. Those skilled in the art can set the specific value and the acquisition method of the target inlet pipe temperature according to needs, and all fall within the protection scope of the present invention.

[0048] As Figure 2 shown, in a possible implementation manner, the control method specifically includes the following steps:

[0049] Step S51: When the air - conditioning system is in heating operation, obtain the pre - stored target inlet pipe temperature according to the difference between the outdoor environmental temperature and the indoor environmental temperature Tin of the area where each indoor unit is located.

[0050] The temperature difference between the outdoor environment temperature and the indoor environment determines the magnitude of the heating load of the air-conditioning system. When the temperature difference between the outdoor temperature and the indoor environment temperature is relatively large, in order to maintain the indoor environment temperature, the air-conditioning system needs to bear a greater heating load. When the temperature difference between the outdoor temperature and the indoor environment temperature is relatively small, the heating load borne by the air-conditioning system is also relatively small. Therefore, the target inlet pipe temperature corresponding to the indoor unit with a relatively large heating load is also relatively large, thereby improving the heating capacity of the indoor unit. Conversely, for the indoor unit with a relatively small heating load, the target inlet pipe temperature is also correspondingly relatively small, thereby reducing the heating capacity of the indoor unit, saving energy consumption, and being able to balance the heating capacities between indoor units.

[0051] For example, step S51 further includes:

[0052] Step: When the difference between the outdoor environment temperature and the indoor environment temperature Tin of the indoor unit is the first difference, the target inlet pipe temperature is the first target inlet pipe temperature;

[0053] Step: When the difference between the outdoor environment temperature and the indoor environment temperature Tin of the indoor unit is the second difference, the target inlet pipe temperature is the second target inlet pipe temperature; wherein, the first difference > the second difference, and the first target inlet pipe temperature > the second target inlet pipe temperature.

[0054] Step S521: When Tin < Tin1, then increase the target inlet pipe temperature of this indoor unit; wherein, Tin1 is the indoor target temperature set by the user;

[0055] Step S522: When Tin ≥ Tin1, then keep the target inlet pipe temperature of this indoor unit unchanged.

[0056] Furthermore, if Tin < Tin1, it means that the indoor environment temperature of this indoor unit is lower than the indoor target temperature set by the user. Then, on the basis of the existing target inlet pipe temperature, increase the target inlet pipe temperature of this indoor unit to further enhance the heating capacity of this indoor unit and quickly raise the temperature. If Tin ≥ Tin1, it means that the indoor environment temperature has reached the indoor target temperature set by the user, and this indoor unit has no heating requirement. Then, keep the target inlet pipe temperature of this indoor unit unchanged and do not increase the heating capacity of this indoor unit. However, it should be noted that the present invention does not impose any restrictions on the increase amount of the target inlet pipe temperature when Tin < Tin1. Those skilled in the art can set it according to needs, and all fall within the protection scope of the present invention.

[0057] Step S53: Obtain the inlet pipe temperature Tci of each indoor unit;

[0058] Step S541: When Tci < the target inlet pipe temperature, then increase the opening degree of the refrigerant flow regulating valve of this indoor unit and increase the fan speed of the indoor unit;

[0059] Step S542: When Tci > the target inlet pipe temperature, then reduce the opening degree of the refrigerant flow regulating valve of this indoor unit and decrease the fan speed of the indoor unit;

[0060] Step: When Tci = the target inlet pipe temperature, then keep the opening degree of the refrigerant flow regulating valve of this indoor unit and the fan speed of the indoor unit unchanged.

[0061] Obtain the inlet pipe temperature Tci of each indoor unit in the air-conditioning system. If Tci < the target inlet pipe temperature, then the elevation difference between this indoor unit and the outdoor unit is relatively large. By increasing the opening degree of the refrigerant flow regulating valve of this indoor unit, increasing the refrigerant flow rate entering the indoor unit, and increasing the fan speed of the indoor unit, the air volume and air outlet temperature of the indoor unit are increased, further enhancing the heating capacity of this indoor unit; if Tci > the target inlet pipe temperature, then the elevation difference between this indoor unit and the outdoor unit is relatively small. By reducing the opening degree of the refrigerant flow regulating valve of this indoor unit, reducing the refrigerant flow rate entering the indoor unit, and decreasing the fan speed of the indoor unit, the air volume and air outlet temperature of the indoor unit are decreased, reducing the heating capacity of this indoor unit, thereby saving energy consumption, and enabling the heating temperature adjustment capabilities of each indoor unit in the air-conditioning system to tend to be consistent, achieving the balance of heating capacity and meeting the actual heating needs of users.

[0062] Based on dynamically obtaining the target inlet pipe temperature of each indoor unit through the difference between the outdoor environmental temperature and the indoor environmental temperature, the control method of the air-conditioning system can selectively increase or maintain the target inlet pipe temperature by comparing the indoor environmental temperature and the indoor target temperature set by the user, which can further improve the heating capacity of the high-elevation-difference indoor units that have not reached the user-set temperature. On the contrary, when the indoor environmental temperature reaches the indoor environmental temperature set by the user, the heating capacity of the indoor unit is decreased, which is more energy-saving, and can achieve the purpose of balancing the heating capacities of each indoor unit.

[0063] It should also be noted that the present invention does not impose any restrictions on the opening degree of the refrigerant flow regulating valve of the indoor unit and its adjustment amount. Those skilled in the art can set it according to needs, and all fall within the protection scope of the present invention.

[0064] In summary, the control method of the air-conditioning system of the present invention can dynamically adjust the target inlet pipe temperature according to the actual needs of users and the temperature difference between the indoor and outdoor environments. On the basis of improving the heating capacity of the indoor units with large elevation differences, it takes into account the temperature requirements of users for the indoor units, greatly improving the temperature adjustment capabilities of the indoor units with large elevation differences and low room temperatures. When the indoor temperature is lower than the target temperature, the indoor temperature can be quickly increased. By reducing the heating capacity of the indoor units with small elevation differences, the inlet pipe temperatures of all indoor units in the air-conditioning system can tend to their respective target inlet pipe temperatures according to actual needs, ensuring that the heating capacities of each indoor unit tend to be consistent, saving energy consumption and meeting the temperature requirements of users, and improving the user experience.

[0065] As described in the first paragraph of this section, the above embodiments are only used to illustrate the principles of the present invention and are not intended to limit the protection scope of the present invention. Without departing from the principles of the present invention, those skilled in the art can adjust the above structures so that the present invention can be applied to more specific application scenarios.

[0066] In addition, the present invention also provides an air-conditioning system, which includes a memory and a processor. The memory is adapted to store multiple program codes, and the program codes are adapted to be loaded and run by the processor to execute the control method of the air-conditioning system described in any one of the above embodiments.

[0067] Those skilled in the art can understand that the above air-conditioning system also includes some other well-known structures, such as a processor, a controller, a memory, etc. Among them, the memory includes but is not limited to random access memory, flash memory, read-only memory, programmable read-only memory, volatile memory, non-volatile memory, serial memory, parallel memory or registers, etc. The processor includes but is not limited to CPLD / FPGA, DSP, ARM processor, MIPS processor, etc. To avoid unnecessarily obscuring the embodiments of the present disclosure, these well-known structures are not shown in the drawings.

[0068] In the above embodiments, although the various steps are described in the above order, those skilled in the art can understand that, in order to achieve the effects of this embodiment, different steps do not have to be executed in such an order. They can be executed simultaneously (in parallel) or in reverse order. For example, "when the air-conditioning system is operating in heating mode, obtain the indoor environmental temperature Tin and the target inlet pipe temperature of the area where the indoor unit is located" in step S10 can also be set to obtain the indoor environmental temperature Tin first and then obtain the target inlet pipe temperature, or obtain the target inlet pipe temperature first and then obtain the indoor environmental temperature Tin, or, the two can be obtained simultaneously. For another example, step S30 can also be cancelled, and the inlet pipe temperature Tci, the indoor environmental temperature Tin, and the target inlet pipe temperature can be obtained simultaneously, etc. Those skilled in the art can set the order of the steps according to their needs, and all fall within the protection scope of the present invention.

[0069] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present invention.

Claims

1. A control method for an air conditioning system, characterized in that, The air-conditioning system of the present invention includes a plurality of indoor units installed in combination. The indoor unit includes an indoor unit heat exchanger. A refrigerant flow regulating valve is provided on the refrigerant inlet pipe of the indoor unit heat exchanger, which is used to regulate the refrigerant flow rate entering the indoor unit heat exchanger. The control method includes: When the air-conditioning system operates in heating mode, obtain the indoor environmental temperature Tin and the target inlet pipe temperature of the area where the indoor unit is located; When Tin < Tin1, increase the target inlet pipe temperature of the indoor unit; where Tin1 is the indoor target temperature set by the user; Obtain the inlet pipe temperature Tci of the indoor unit; When Tci < the target inlet pipe temperature, increase the opening degree of the refrigerant flow regulating valve of the indoor unit.

2. The control method of the air conditioning system according to claim 1, wherein The step of "obtaining the target inlet pipe temperature of the indoor unit" further includes: Obtain the pre-stored target inlet pipe temperature according to the difference between the outdoor environmental temperature and the indoor environmental temperature Tin of the indoor unit.

3. The control method of the air-conditioning system according to claim 2, characterized in that, The step of "obtaining the pre-stored target inlet pipe temperature according to the difference between the outdoor environmental temperature and the indoor environmental temperature Tin of the indoor unit" further includes: When the difference between the outdoor environmental temperature and the indoor environmental temperature Tin of the indoor unit is the first difference, the target inlet pipe temperature is the first target inlet pipe temperature; When the difference between the outdoor environmental temperature and the indoor environmental temperature Tin of the indoor unit is the second difference, the target inlet pipe temperature is the second target inlet pipe temperature; Wherein, the first difference > the second difference, and the first target inlet pipe temperature > the second target inlet pipe temperature.

4. The control method of the air-conditioning system according to claim 1, characterized in that, After the step of "when the air-conditioning system operates in heating mode, obtain the indoor environmental temperature Tin and the target inlet pipe temperature of the area where the indoor unit is located", the control method includes: When Tin ≥ Tin1, keep the target inlet pipe temperature of the indoor unit unchanged.

5. The control method of the air conditioning system according to claim 1, wherein After the step of "obtaining the inlet pipe temperature Tci of the indoor unit", the control method includes: When Tci > the target inlet pipe temperature, decrease the opening degree of the refrigerant flow regulating valve of the indoor unit.

6. The control method of the air conditioning system according to claim 1, characterized in that, The step of "when Tci < the target inlet pipe temperature, increase the opening degree of the refrigerant flow regulating valve of the indoor unit" further includes: When Tci < the target inlet pipe temperature value, increase the opening degree of the refrigerant flow regulating valve of the indoor unit and increase the fan speed of the indoor unit.

7. The control method of the air conditioning system according to claim 5, wherein The step of "when Tci > the target inlet pipe temperature, decrease the opening degree of the refrigerant flow regulating valve of the indoor unit" further includes: When Tci > the target inlet pipe temperature, decrease the opening degree of the refrigerant flow regulating valve of the indoor unit and decrease the fan speed of the indoor unit.

8. The control method of the air conditioning system according to claim 1, characterized in that, After the step of "obtaining the inlet pipe temperature Tci of the indoor unit", the control method includes: When Tci = the target inlet pipe temperature, keep the opening degree of the refrigerant flow regulating valve of the indoor unit unchanged.

9. The control method of the air conditioning system according to claim 8, wherein The step of "when Tci = the target inlet pipe temperature, keep the opening degree of the refrigerant flow regulating valve of the indoor unit unchanged" further includes: When Tci = the target inlet pipe temperature, keep the opening degree of the refrigerant flow regulating valve of the indoor unit and the fan speed of the indoor unit unchanged.

10. An air conditioning system, characterized in that, The air conditioning system includes a memory and a processor. The memory is adapted to store multiple program codes, and the program codes are adapted to be loaded and run by the processor to execute the control method of the air conditioning system according to any one of claims 1-9.

Images