Photovoltaic air conditioner and control method thereof

Abstract

The application discloses a photovoltaic air conditioner and a control method thereof, and relates to the technical field of air conditioners, in particular to a photovoltaic air conditioner and a control method thereof. The photovoltaic air conditioner comprises an air conditioner function assembly, wherein the air conditioner function assembly comprises a compressor, a communication valve and a heat exchanger, the compressor is connected with the heat exchanger through the communication valve, the heat exchanger comprises a condenser and an evaporator, a vortex tube is connected with the compressor, the communication valve and the heat exchanger, an adjusting branch is formed from the vortex tube to the heat exchanger, and an adjusting valve is arranged on the adjusting branch. The compressor is connected with the heat exchanger through the communication valve, the vortex tube is connected with the compressor, the communication valve and the heat exchanger, the adjusting branch is formed from the vortex tube to the heat exchanger, and the adjusting valve is arranged on the adjusting branch to adjust the operation process of the photovoltaic air conditioner, so that the refrigerant flow rate in the adjusting branch is controlled through the adjusting valve according to different operation states of the photovoltaic air conditioner, the energy consumption of the photovoltaic air conditioner is reduced, the performance of the photovoltaic air conditioner is improved, and the energy utilization efficiency of the photovoltaic air conditioner is improved.

Description

Technical Field

[0001] This invention relates to the field of air conditioner technology, and in particular to a photovoltaic air conditioner and its control method. Background Technology

[0002] Air conditioning has become an essential appliance in modern households. Solar photovoltaic (PV) air conditioners, utilizing solar photovoltaic power generation technology, not only reduce energy consumption compared to traditional air conditioners but also decrease heat generation and emissions, thus reducing environmental pollution and improving energy efficiency. This makes PV air conditioning an important method of clean energy utilization, and its development a future trend in the air conditioning industry. However, for current PV air conditioners, further improving their energy efficiency remains a problem for those skilled in the art to solve. Summary of the Invention

[0003] This invention provides a photovoltaic air conditioner and its control method, aiming to improve the energy utilization efficiency of the photovoltaic air conditioner.

[0004] In a first aspect, embodiments of the present invention provide a photovoltaic air conditioner, the photovoltaic air conditioner comprising:

[0005] An air conditioning functional component, comprising: a compressor, a connecting valve, and a heat exchanger, wherein the compressor is connected to the heat exchanger via the connecting valve; and wherein the heat exchanger comprises a condenser and an evaporator.

[0006] The vortex tube is connected to the compressor, the connecting valve and the heat exchanger respectively, and a regulating branch is formed from the vortex tube to the heat exchanger;

[0007] A regulating valve is installed on the regulating branch.

[0008] Preferably, the connecting valve has four connecting ends: a first connecting end, a second connecting end, a third connecting end, and a fourth connecting end;

[0009] The first connecting end is connected to the vortex tube, the second connecting end is connected to the condenser, the third connecting end is connected to the evaporator, and the fourth connecting end is connected to the inlet end of the compressor.

[0010] The compressor's outlet end is connected to the vortex tube.

[0011] Preferably, the regulating valve includes a first regulating valve, a second regulating valve, and a third regulating valve; the vortex tube includes a vortex inlet end, a first vortex outlet end, and a second vortex outlet end.

[0012] The vortex inlet end is connected to the outlet end of the compressor;

[0013] The first regulating valve is located between the first vortex outlet end and the first connecting end; the second regulating valve is located between the second vortex outlet end and the condenser; and the third regulating valve is located between the second vortex outlet end and the evaporator.

[0014] A first regulating branch is formed from the first vortex outlet end, the first regulating valve, and finally to the first connecting end; a second regulating branch is formed from the second vortex outlet end, the second regulating valve, and finally to the condenser; and a third regulating branch is formed from the second vortex outlet end, the third regulating valve, and finally to the evaporator.

[0015] Preferably, the condenser includes a first condensation inlet end, a second condensation inlet end, and a condensation outlet end; the first condensation inlet end is connected to the second communication end, the second condensation inlet end is connected to the second regulating valve, and the condensation outlet end is connected to the evaporator;

[0016] The evaporator includes an evaporation inlet end and an evaporation outlet end; the evaporation inlet end is connected to the third regulating valve and the condenser; the evaporation outlet end is connected to the third connecting end.

[0017] Preferably, it also includes an electronic expansion valve, which is disposed between the condensate outlet end and the evaporation inlet end;

[0018] The inlet end of the electronic expansion valve is connected to the condenser outlet end, and the outlet end of the electronic expansion valve is connected to the evaporation inlet end.

[0019] The third regulating valve is connected between the outlet end of the electronic expansion valve and the evaporation inlet end.

[0020] Secondly, embodiments of the present invention also provide a control method applied to the photovoltaic air conditioner described above, the control method comprising:

[0021] During the operation of the photovoltaic air conditioner, the current operating mode and power supply mode of the photovoltaic air conditioner are detected and the detection results are obtained; and it is determined whether the power of the photovoltaic air conditioner during operation meets the operating requirements and the judgment result is obtained; the operating mode includes cooling mode and heating mode, and the power supply mode includes pure photovoltaic power supply mode, hybrid power supply mode and pure AC mains power supply mode.

[0022] The opening degree of the regulating valve in the regulating branch is adjusted according to the detection results and judgment results to regulate the operation of the photovoltaic air conditioner.

[0023] Preferably, adjusting the opening of the regulating valve in the regulating branch according to the detection result and the judgment result to regulate the operation of the photovoltaic air conditioner includes:

[0024] When the photovoltaic air conditioner is in cooling mode and pure photovoltaic power supply mode, if the photovoltaic power supply is greater than or equal to the power required for the operation of the photovoltaic air conditioner, the first regulating valve and the second regulating valve are opened, the third regulating valve is closed, and the opening degree of the first regulating valve and the second regulating valve and the frequency of the compressor are adjusted according to a preset range.

[0025] When the photovoltaic air conditioner is in cooling mode and pure photovoltaic power supply mode, if the photovoltaic power supply is less than the power required for the operation of the photovoltaic air conditioner, the first and second regulating valves are opened to the maximum opening, the third regulating valve is closed, and the speed of the indoor fan and the outdoor fan are adjusted step by step according to the difference between the frequency of the compressor and the required frequency.

[0026] When the photovoltaic air conditioner is in cooling mode and in a mixed power supply mode or a pure AC mains power supply mode, the ambient temperature is detected and the opening of the regulating valve is adjusted step by step according to the ambient temperature.

[0027] Preferably, the step of adjusting the opening of the regulating valve in the regulating branch according to the detection result and the judgment result to regulate the operation of the photovoltaic air conditioner further includes:

[0028] When the photovoltaic air conditioner is in heating mode and pure photovoltaic power supply mode, if the photovoltaic power supply is greater than or equal to the power required for the operation of the photovoltaic air conditioner, the first regulating valve and the third regulating valve are opened, the second regulating valve is closed, and the opening degree of the first regulating valve and the third regulating valve are adjusted according to a preset range, as well as the frequency of the compressor is adjusted.

[0029] When the photovoltaic air conditioner is in heating mode and pure photovoltaic power supply mode, if the photovoltaic power supply is less than the power required for the operation of the photovoltaic air conditioner, the first regulating valve and the third regulating valve are opened to the maximum opening, the second regulating valve is closed, and the speed of the indoor fan and the outdoor fan are adjusted step by step according to the difference between the frequency of the compressor and the required frequency.

[0030] When the photovoltaic air conditioner is in heating mode and in mixed power supply mode or pure AC mains power supply mode, the ambient temperature is detected, and the opening degree of the first regulating valve and the third regulating valve are adjusted according to the ambient temperature, as well as the frequency and speed of the compressor.

[0031] Preferably, the control method further includes:

[0032] The photovoltaic air conditioner is determined to be ready for defrosting based on the external pipe temperature. If the photovoltaic air conditioner is ready for defrosting, the opening of the first regulating valve is increased before the defrosting begins until the internal pipe temperature of the photovoltaic air conditioner rises to the preset temperature.

[0033] When the photovoltaic air conditioner starts defrosting, close the second and third regulating valves, adjust the opening of the first regulating valve to the maximum, and adjust the compressor frequency to increase the exhaust temperature.

[0034] Preferably, the step of determining whether the photovoltaic air conditioner needs defrosting based on the external pipe temperature includes:

[0035] When the photovoltaic air conditioner is in heating mode, the external pipe temperature of the compressor and the rate of change of the external pipe temperature are detected.

[0036] The external pipe temperature is compared with a preset frosting temperature. When the difference between the external pipe temperature and the frosting temperature meets a preset difference threshold, and the rate of change of the external pipe temperature meets a preset rate of change threshold, it is determined that the photovoltaic air conditioner needs to be defrosted.

[0037] This invention discloses a photovoltaic air conditioner and its control method. The photovoltaic air conditioner includes: an air conditioning functional component, comprising: a compressor, a connecting valve, and a heat exchanger. The compressor is connected to the heat exchanger via the connecting valve. The heat exchanger includes a condenser and an evaporator. A vortex tube is connected to the compressor, the connecting valve, and the heat exchanger, forming a regulating branch from the vortex tube to the heat exchanger. A regulating valve is disposed on the regulating branch. This invention connects the compressor and the heat exchanger via the connecting valve and sets up a vortex tube connected to the compressor, the connecting valve, and the heat exchanger, thereby forming a regulating branch from the vortex tube to the heat exchanger. A regulating valve is disposed on the regulating branch to regulate the operation of the photovoltaic air conditioner. The regulating branch controls the refrigerant flow rate in the regulating branch according to different operating states of the photovoltaic air conditioner, reducing energy consumption and improving performance, thus increasing the energy efficiency of the photovoltaic air conditioner. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 A schematic diagram of a photovoltaic air conditioner provided in an embodiment of the present invention;

[0040] Figure 2 This is a schematic diagram of the structure of a vortex tube in a photovoltaic air conditioner provided by an embodiment of the present invention;

[0041] Figure 3 A flowchart illustrating a control method provided in an embodiment of the present invention;

[0042] Figure 4 A schematic diagram of a sub-process of a control method provided in an embodiment of the present invention;

[0043] Figure 5 This is a schematic diagram of another sub-process of a control method provided in an embodiment of the present invention.

[0044] The diagram shows the following components: 10, compressor; 20, connecting valve; 21, first connecting end; 22, second connecting end; 23, third connecting end; 24, fourth connecting end; 30, heat exchanger; 31, condenser; 32, evaporator; 40, vortex tube; 41, first vortex outlet end; 42, second vortex outlet end; 43, vortex inlet end; 44, nozzle; 45, vortex chamber; 46, separation orifice plate; 47, cold end tube; 48, hot end tube; 50, regulating valve; 51, first regulating valve; 52, second regulating valve; 53, third regulating valve; 60, electronic expansion valve. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0047] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0048] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0049] Please see below. Figure 1 , Figure 1 A schematic diagram of a photovoltaic air conditioner provided in an embodiment of the present invention specifically includes:

[0050] An air conditioning functional component includes: a compressor 10, a connecting valve 20, and a heat exchanger 30, wherein the compressor 10 is connected to the heat exchanger 30 through the connecting valve 20; wherein the heat exchanger 30 includes a condenser 31 and an evaporator 32.

[0051] The vortex tube 40 is connected to the compressor 10, the connecting valve 20 and the heat exchanger 30 respectively, and a regulating branch is formed from the vortex tube 40 to the heat exchanger 30.

[0052] The regulating valve 50 is installed on the regulating branch.

[0053] In this embodiment, the compressor 10 and the heat exchanger 30 are connected via a connecting valve 20, and a vortex tube 40 is connected to the compressor 10, the connecting valve 20, and the heat exchanger 30 respectively. This forms a regulating branch from the vortex tube 40 to the heat exchanger 30, and a regulating valve 50 is installed on this branch. The operation of the photovoltaic air conditioner is regulated via this branch, thereby controlling the refrigerant flow rate in the regulating branch according to different operating states of the photovoltaic air conditioner. This reduces the energy consumption of the photovoltaic air conditioner, improves its performance, and thus enhances its energy efficiency. In a specific embodiment, the various components of the photovoltaic air conditioner can be connected via pipelines.

[0054] In one embodiment, the connecting valve 20 has four connecting ends: a first connecting end 21, a second connecting end 22, a third connecting end 23, and a fourth connecting end 24;

[0055] The first connecting end 21 is connected to the vortex tube 40, the second connecting end 22 is connected to the condenser 31, the third connecting end 23 is connected to the evaporator 32, and the fourth connecting end 24 is connected to the inlet end of the compressor 10.

[0056] The outlet end of the compressor 10 is connected to the vortex tube 40.

[0057] In this embodiment, by providing four connecting ends in the connecting valve 20, including a first connecting end 21, a second connecting end 22, a third connecting end 23, and a fourth connecting end 24, and connecting the vortex tube 40 through the first connecting end 21, the condenser 31 through the second connecting end 22, the evaporator 32 through the third connecting end 23, and the inlet end of the compressor 10 through the fourth connecting end 24, and connecting the outlet end of the compressor 10 to the vortex tube 40, it is possible to connect the vortex tube 40, the condenser 31, the evaporator 32, and the compressor 10 through the connecting valve 20 respectively, thereby enabling control and regulation of the operation of the photovoltaic air conditioner.

[0058] In one embodiment, the regulating valve 50 includes a first regulating valve 51, a second regulating valve 52, and a third regulating valve 53; the vortex tube 40 includes a vortex inlet end 43, a first vortex outlet end 41, and a second vortex outlet end 42.

[0059] The vortex inlet end 43 is connected to the outlet end of the compressor 10;

[0060] The first regulating valve 51 is disposed between the first vortex outlet end 41 and the first connecting end 21, the second regulating valve 52 is disposed between the second vortex outlet end 42 and the condenser 31, and the third regulating valve 53 is disposed between the second vortex outlet end 42 and the evaporator 32.

[0061] A first regulating branch is formed from the first vortex outlet end 41, the first regulating valve 51, and finally to the first connecting end 21; a second regulating branch is formed from the second vortex outlet end 42, the second regulating valve 52, and finally to the condenser 31; a third regulating branch is formed from the second vortex outlet end 42, the third regulating valve 53, and finally to the evaporator 32.

[0062] In this embodiment, the vortex inlet end 43 is connected to the outlet end of the compressor 10. A first regulating valve 51 is positioned between the first vortex outlet end 41 and the first connecting end 21; a second regulating valve 52 is positioned between the second vortex outlet end 42 and the condenser 31; and a third regulating valve 53 is positioned between the second vortex outlet end 42 and the evaporator 32. This forms a first regulating branch from the first vortex outlet end 41, through the first regulating valve 51, to the first connecting end 21; a second regulating branch from the second vortex outlet end 42, through the second regulating valve 52, to the condenser 31; and a third regulating branch from the second vortex outlet end 42, through the third regulating valve 53, to the evaporator 32. These three regulating branches regulate the photovoltaic air conditioner under different operating conditions. In a specific embodiment, the first regulating valve 51, the second regulating valve 52, or the third regulating valve 53 can be controlled individually or in conjunction, allowing the photovoltaic air conditioner to adapt to different operating conditions and enabling more flexible regulation and control.

[0063] In one embodiment, the condenser 31 includes a first condensation inlet end, a second condensation inlet end, and a condensation outlet end; the first condensation inlet end is connected to the second communication end 22, the second condensation inlet end is connected to the second regulating valve 52, and the condensation outlet end is connected to the evaporator 32;

[0064] The evaporator 32 includes an evaporation inlet end and an evaporation outlet end; the evaporation inlet end is connected to the third regulating valve 53 and the condenser 31; the evaporation outlet end is connected to the third connecting end 23.

[0065] In this embodiment, the condenser 31 is connected to the second communication end 22 of the communication valve 20 through the first condensation inlet end, to the second regulating valve 52 through the second condensation inlet end, and to the evaporator 32 through the condensation outlet end. The evaporator 32 is connected to the third regulating valve 53 and the condenser 31 through the evaporation inlet end, and to the third communication end 23 through the evaporation outlet end.

[0066] In one embodiment, an electronic expansion valve 60 is also included, which is disposed between the condensate outlet end and the evaporation inlet end;

[0067] The inlet end of the electronic expansion valve 60 is connected to the condenser outlet end, and the outlet end of the electronic expansion valve 60 is connected to the evaporation inlet end.

[0068] The third regulating valve 53 is connected between the outlet end of the electronic expansion valve and the evaporation inlet end.

[0069] In this embodiment, an electronic expansion valve 60 is also provided between the condenser outlet end and the evaporator inlet end in the photovoltaic air conditioner. The inlet end of the electronic expansion valve 60 is connected to the condenser outlet end, and the outlet end is connected to the evaporator inlet end. A third regulating valve 53 is connected between the outlet end and the evaporator inlet end of the electronic expansion valve 60.

[0070] Combination Figure 2 As shown, in one specific embodiment, the vortex tube 40 includes a nozzle 44, a vortex chamber 45, a separation orifice plate 46, a cold end tube 47, and a hot end tube 48;

[0071] The nozzle 44 is disposed at the vortex inlet end 43, the hot end tube 48 is disposed at the first vortex outlet end 41, the cold end tube 47 is disposed at the second vortex outlet end 42, the vortex chamber 45 is connected to the nozzle 44, the cold end tube 47 and the hot end tube 48 respectively, and the separation orifice plate 46 is disposed at the cold end tube 47.

[0072] In this embodiment, the nozzle 44 in the vortex tube 40 is disposed at the vortex inlet end 43, the cold end tube 47 is disposed at the second vortex outlet end 42, the separation orifice plate 46 is disposed at the cold end tube 47, and the vortex chamber 45 is connected to the nozzle, the cold end tube 47 and the hot end tube 48 respectively. Based on this, the compressed gas in the compressor 10 is discharged from the outlet end of the compressor 10 and passes through the nozzle 44 of the vortex inlet end 43. The nozzle 44 sprays the compressed gas, causing it to expand and enter the vortex chamber 45. In the vortex chamber 45, the compressed gas is subjected to vortex transformation by the separation orifice plate 46, separating it into high-temperature gas and low-temperature gas with different temperatures. The high-temperature gas is guided to the hot end pipe 48 and output from the first vortex outlet end 41 into the first regulating branch. The low-temperature gas is guided to the cold end pipe 47 and output from the second vortex outlet end 42. Then it is divided into two parts. One part enters the subcooling section of the condenser 31 through the second regulating branch, and the other part enters the evaporator 32 through the third regulating branch. The high-temperature gas and low-temperature gas are obtained by splitting the compressed gas through the vortex tube 40, which can improve the efficiency of the photovoltaic air conditioner in cooling or heating.

[0073] Combination Figure 3 As shown, this embodiment of the invention also provides a control method applied to a photovoltaic air conditioner as described in any of the preceding claims, the control method comprising steps S301 to S302.

[0074] S301. During the operation of the photovoltaic air conditioner, the current operating mode and power supply mode of the photovoltaic air conditioner are detected, and the detection results are obtained; and it is determined whether the power of the photovoltaic air conditioner during operation meets the operating requirements, and the judgment result is obtained; the operating mode includes cooling mode and heating mode, and the power supply mode includes pure photovoltaic power supply mode, hybrid power supply mode and pure AC mains power supply mode.

[0075] S302. Adjust the opening of the regulating valve 50 in the regulating branch according to the detection result and the judgment result to regulate the operation of the photovoltaic air conditioner.

[0076] In this embodiment, the operating mode and power supply mode of the photovoltaic air conditioner during its current operation are detected first to obtain the detection results. Then, the power of the photovoltaic air conditioner during operation is judged to obtain the judgment result. Finally, the opening of the regulating valve 50 in the regulating branch is adjusted according to the detection results and the judgment result to control the refrigerant flow rate in the regulating branch, thereby realizing the operation regulation of the photovoltaic air conditioner, reducing the energy consumption of the photovoltaic air conditioner, improving the performance of the photovoltaic air conditioner, and thus improving the energy utilization efficiency of the photovoltaic air conditioner.

[0077] In one embodiment, step S302 includes:

[0078] When the photovoltaic air conditioner is in cooling mode and pure photovoltaic power supply mode, if the photovoltaic power supply is greater than or equal to the power required for the operation of the photovoltaic air conditioner, the first regulating valve 51 and the second regulating valve 52 are opened, the third regulating valve 53 is closed, and the opening degree of the first regulating valve 51 and the second regulating valve 52 and the frequency of the compressor 10 are adjusted according to a preset range.

[0079] When the photovoltaic air conditioner is in cooling mode and pure photovoltaic power supply mode, if the photovoltaic power supply is less than the power required for the operation of the photovoltaic air conditioner, the first regulating valve 51 and the second regulating valve 52 are opened to the maximum opening, the third regulating valve 53 is closed, and the speed of the indoor fan and the outdoor fan are adjusted step by step according to the difference between the frequency of the compressor 10 and the required frequency.

[0080] When the photovoltaic air conditioner is in cooling mode and in a mixed power supply mode or a pure AC mains power supply mode, the ambient temperature is detected and the opening of the regulating valve 50 is adjusted step by step according to the ambient temperature.

[0081] In this embodiment, if the photovoltaic air conditioner is in cooling mode, different adjustment and control operations are selected according to the power supply mode of the photovoltaic air conditioner. At this time, if the photovoltaic air conditioner is in pure photovoltaic power supply mode and the photovoltaic power supply is greater than or equal to the power required for the operation of the photovoltaic air conditioner, the first regulating valve 51 and the second regulating valve 52 are opened, the third regulating valve 53 is closed, and the opening degree of the first regulating valve 51 and the second regulating valve 52 and the frequency of the compressor 10 are adjusted according to a preset range to control the refrigerant flow rate in the first regulating branch and the second regulating branch. If the photovoltaic air conditioner is in pure photovoltaic power supply mode and the photovoltaic power supply is less than the power required for the operation of the photovoltaic air conditioner, the opening degree of the first regulating valve 51 and the second regulating valve 52 is adjusted to the maximum opening degree to maximize the refrigerant flow rate in the first regulating branch and the second regulating branch, while keeping the third regulating valve 53 closed. Then, the speed of the indoor fan and the outdoor fan is adjusted according to the difference between the frequency of the compressor 10 and the required frequency. If the photovoltaic air conditioner is in mixed power supply mode or pure AC mains power supply mode, the ambient temperature is detected and the opening degree of the regulating valve 50 is adjusted step by step according to the ambient temperature.

[0082] In specific application scenarios, if the photovoltaic air conditioner is in pure photovoltaic power supply mode, it means that the photovoltaic air conditioner relies solely on the photovoltaic panel for power supply and does not draw power from the grid. At this time, the power that the photovoltaic panel can provide is limited by the specific lighting conditions and the installation area of ​​the photovoltaic panel. If the power provided by the photovoltaic panel is insufficient to make the compressor 10 run at the frequency corresponding to the original ambient temperature, it will result in insufficient cooling or heating capacity of the photovoltaic air conditioner, reducing the user's cooling or heating experience.

[0083] Therefore, in one specific embodiment, when the photovoltaic air conditioner is in cooling mode and in pure photovoltaic power supply mode, if the photovoltaic power supply is greater than or equal to the power required for the operation of the photovoltaic air conditioner, the compressor 10 works normally. The compressed gas is separated into high-temperature gas and low-temperature gas through the vortex tube 40. At this time, the first regulating valve 51 and the second regulating valve 52 are opened, and the third regulating valve 53 is closed. The high-temperature gas enters the inlet end of the condenser 31 through the first regulating branch, and the low-temperature gas enters the condenser 31 through the second regulating branch and is transmitted to the outlet end of the condenser 31, thereby increasing the inlet temperature of the condenser 31 and decreasing the outlet temperature of the condenser 31, thereby improving the cooling performance of the photovoltaic air conditioner.

[0084] In this process, the external temperature T0 when the photovoltaic air conditioner is turned on is first recorded, and the target exhaust temperature T1 corresponding to the external temperature T0 is obtained, as well as the initial frequency F0 of the compressor 10 corresponding to the external temperature T0. The external pipe temperature T3 and the actual exhaust temperature T2 of the compressor 10 are also obtained. Within 3 minutes of the photovoltaic air conditioner being turned on, the compressor 10 is run at the initial frequency F0, and the opening of the first regulating valve 51 and the second regulating valve 52 are controlled according to K1' = K1 + a*(T1-T2) and K2' = K2 + b*T3. Here, K1 and K2 represent the initial opening of the first regulating valve 51 and the second regulating valve 52, respectively, and K1' and K2' represent the opening after adjustment of the first regulating valve 51 and the second regulating valve 52, respectively. a and b are the opening coefficients of the temperature difference. At this time, the third regulating valve 53 is in the closed state, so the opening K3 of the third regulating valve 53 is 0. After the photovoltaic air conditioner has been running for 3 minutes, the opening of the first regulating valve 51 is increased by 3P / min. This increases the refrigerant flow in the first regulating branch, thereby raising the exhaust temperature and increasing the amount of high-temperature gas entering the condenser 31. At this time, the frequency of the compressor 10 is reduced by 1Hz / min. The frequency is then judged based on the real-time frequency. If T2 is always greater than T1 during the continuous operation at the real-time frequency for 2 minutes, the frequency of the compressor 10 can be further reduced until the opening of the first regulating valve 51 is adjusted to the maximum, so that the refrigerant flow in the first regulating branch reaches the maximum. If T2 is not always greater than T1 during the continuous operation at the real-time frequency for 2 minutes, the frequency of the compressor 10 is not reduced, and the opening of the first regulating valve 51 is further increased until the condition that T2 is always greater than T1 during the continuous operation at the real-time frequency for 2 minutes is met. By reducing the frequency of the compressor 10, the power consumption of the photovoltaic air conditioner can be reduced, thereby achieving the effect of saving electricity and improving the energy utilization efficiency of the photovoltaic air conditioner.

[0085] It should be noted that the opening coefficient of the temperature difference can be obtained through experimental testing. In addition, the reason for adjusting the photovoltaic air conditioner after running for 3 minutes is that there is a hysteresis in the photovoltaic air conditioner's judgment of the ambient temperature. If the adjustment is made directly when the photovoltaic air conditioner is turned on, the opening adjustment may be inaccurate due to inaccurate temperature judgment. In specific application scenarios, it is not limited to adjusting the photovoltaic air conditioner after running for 3 minutes. Adjustment can be made according to the actual situation.

[0086] In another embodiment, when the photovoltaic air conditioner is in cooling mode and pure photovoltaic power supply mode, if the photovoltaic power supply is less than the power required for the operation of the photovoltaic air conditioner, that is, the actual operating frequency F1 of the compressor 10 is less than the frequency F0 corresponding to the ambient temperature, and the actual exhaust temperature T2 of the compressor 10 is less than the target exhaust temperature T1, the photovoltaic air conditioner cannot meet the cooling demand. At this time, the compressor 10 cannot be increased to the frequency required for the operation of the photovoltaic air conditioner, so there is no need for a higher speed for heat exchange. By reducing the speed, the power consumption of the photovoltaic air conditioner can be reduced, and the power consumption can also be reduced so that the remaining power can be provided to the compressor 10 for appropriate frequency increase.

[0087] Specifically, at this time, the opening degree K1 of the first regulating valve 51 and the opening degree K2 of the second regulating valve 52 are adjusted to the maximum opening degree, so that the refrigerant flow in the first regulating branch and the second regulating branch reaches the maximum, while keeping the opening degree K3 of the third regulating valve 53 at 0. Then, the actual operating frequency F1 of the compressor 10 is compared with the required frequency F0 corresponding to the target exhaust temperature T1. When F0-F1∈(0,3]Hz, the indoor and outdoor fans of the photovoltaic air conditioner are operated at their original speeds. When F0-F1∈(3,7]Hz, the speed of the indoor fan is reduced by 100r / min, and the speed of the outdoor fan is reduced by 50r / min. When F0-F1∈(7,15]Hz, the speed of the indoor fan is reduced by 150r / min, and the speed of the outdoor fan is reduced by 100r / min. When F0-F1∈(15,F0)Hz, the indoor fan is set to silent mode, and the outdoor fan is set to low speed. A signal is sent to the user to prompt whether to increase the power supply from the AC mains side to avoid insufficient cooling effect, which would otherwise affect the user's comfort.

[0088] In another embodiment, if the photovoltaic air conditioner is in cooling mode and in a mixed power supply mode or a pure AC mains power supply mode, the photovoltaic air conditioner will not experience insufficient power supply. Therefore, it is necessary to reasonably adjust and control the photovoltaic air conditioner. By detecting the ambient temperature and adjusting the opening of the regulating valve 50 step by step according to the ambient temperature, the photovoltaic air conditioner will not be overloaded and thus unable to operate at the corresponding upper limit frequency, thereby avoiding the problem of low output cooling capacity.

[0089] Specifically, when 43°C<T0<48°C, within 3 minutes after the photovoltaic air conditioner is started and operated, the compressor 10 is operated at the initial frequency F0, the opening degrees of the first regulating valve 51 and the second regulating valve 52 are controlled according to K1'=K1+a*(T1-T2), K2'=K2+b*T3, and the opening degree K3 of the third regulating valve 53 is kept at 0; 3 minutes after the photovoltaic air conditioner is started and operated, the opening degree of the first regulating valve 51 is increased at a rate of 3P / min, and the opening degree of the second regulating valve 52 is increased at a rate of 5P / min, so as to increase the refrigerant flow in the first regulating branch and the second regulating branch. At this time, the frequency of the compressor 10 is the upper limit corresponding to the temperature and no longer changes, until the operation reaches T2=100°C, the real-time opening degrees of the first regulating valve 51 and the second regulating valve 52 are kept no longer increasing, so as to prevent shutdown caused by excessively high exhaust gas temperature.

[0090] When 48°C<T0<55°C, within 3 minutes after the photovoltaic air conditioner is started and operated, the compressor 10 is operated at the initial frequency F0, the opening degrees of the first regulating valve 51 and the second regulating valve 52 are controlled according to K1'=K1+a*(T1-T2), K2'=K2+b*T3, and the opening degree K3 of the third regulating valve 53 is kept at 0. 3 minutes after the photovoltaic air conditioner is started and operated, the opening degree of the first regulating valve 51 is increased at a rate of 6P / min, and the opening degree of the second regulating valve 52 is increased at a rate of 8P / min. At this time, the frequency of the compressor 10 is the upper limit corresponding to the temperature and no longer changes, until the operation reaches T2=105°C, the real-time opening degrees of the first regulating valve 51 and the second regulating valve 52 are kept no longer increasing.

[0091] When T0>55°C, within 3 minutes after the photovoltaic air conditioner is started and operated, the compressor 10 is operated at the initial frequency F0, the opening degrees of the first regulating valve 51 and the second regulating valve 52 are controlled according to K1'=K1+a*(T1-T2), K2'=K2+b*T3, and the opening degree K3 of the third regulating valve 53 is kept at 0. 3 minutes after the photovoltaic air conditioner is started and operated, the opening degree of the first regulating valve 51 is increased at a rate of 10P / min, and the opening degree of the second regulating valve 52 is increased at a rate of 15P / min. At this time, the frequency of the compressor 10 is the upper limit corresponding to the temperature and no longer changes, until the operation reaches T2=110°C, the real-time opening degrees of the first regulating valve 51 and the second regulating valve 52 are kept no longer increasing.

[0092] In one embodiment, the S302 further includes:

[0093] When the photovoltaic air conditioner is in heating mode and pure photovoltaic power supply mode, if the photovoltaic power supply is greater than or equal to the power required for the operation of the photovoltaic air conditioner, the first regulating valve 51 and the third regulating valve 53 are opened, the second regulating valve 52 is closed, and the opening degree of the first regulating valve 51 and the third regulating valve 53 is adjusted according to a preset range, as well as the frequency of the compressor 10 is adjusted.

[0094] When the photovoltaic air conditioner is in heating mode and pure photovoltaic power supply mode, if the photovoltaic power supply is less than the power required for the operation of the photovoltaic air conditioner, the first regulating valve 51 and the third regulating valve 53 are opened to the maximum opening, the second regulating valve 52 is closed, and the speed of the indoor fan and the outdoor fan are adjusted step by step according to the difference between the frequency of the compressor 10 and the required frequency.

[0095] When the photovoltaic air conditioner is in heating mode and in mixed power supply mode or pure AC mains power supply mode, the ambient temperature is detected, and the opening degree of the first regulating valve 51 and the third regulating valve 53 is adjusted according to the ambient temperature, as well as the frequency and speed of the compressor 10.

[0096] In this embodiment, if the photovoltaic air conditioner is in heating mode, different adjustment and control operations are selected according to the power supply mode of the photovoltaic air conditioner. At this time, if the photovoltaic air conditioner is in pure photovoltaic power supply mode and the photovoltaic power supply is greater than or equal to the power required for the operation of the photovoltaic air conditioner, the first regulating valve 51 and the third regulating valve 53 are opened, the second regulating valve 52 is closed, and the opening degree of the first regulating valve 51 and the third regulating valve 53 and the frequency of the compressor 10 are adjusted according to the preset range; if the photovoltaic air conditioner is in pure photovoltaic power supply mode and the photovoltaic power supply is less than the power required for the operation of the photovoltaic air conditioner, the opening degree of the first regulating valve 51 and the third regulating valve 53 is adjusted to the maximum opening degree, so that the refrigerant flow in the first regulating branch and the second regulating branch reaches the maximum, and the second regulating valve 52 is kept closed. Then, the speed of the indoor fan and the outdoor fan is adjusted according to the difference between the frequency of the compressor 10 and the required frequency; if the photovoltaic air conditioner is in mixed power supply mode or pure AC mains power supply mode, the ambient temperature is detected and the opening degree of the regulating valve 50 is adjusted step by step according to the ambient temperature.

[0097] In one specific embodiment, when the photovoltaic air conditioner is in heating mode and pure photovoltaic power supply mode, if the photovoltaic power supply is greater than or equal to the power required for the operation of the photovoltaic air conditioner, the compressor 10 will work normally, opening the first regulating valve 51 and the third regulating valve 53, closing the second regulating valve 52, and running the compressor 10 at the initial frequency F0 within 3 minutes of the photovoltaic air conditioner starting up. The opening degree of the first regulating valve 51 and the third regulating valve 53 will be controlled according to K1'=K1+d*(T1-T2) and K3'=K3+e*T4, where T4 is the internal pipe temperature of the compressor 10, and d and e are both opening coefficients of the temperature difference. At this time, the second regulating valve 52 is in the closed state, and the opening degree K2 of the second regulating valve 52 is 0. After the photovoltaic air conditioner has been running for 3 minutes, the opening of the first regulating valve 51 is increased by 3P / min, and the frequency of the compressor 10 is decreased by 1Hz / min. The system judges whether the compressor frequency is lower than T1 during the continuous operation of the real-time frequency for 2 minutes. If T2 is not always greater than T1 during the continuous operation of the real-time frequency for 2 minutes, the compressor frequency is lowered until the opening of the first regulating valve 51 is adjusted to the maximum. If T2 is not always greater than T1 during the continuous operation of the real-time frequency for 2 minutes, the compressor frequency is not lowered, and the opening of the first regulating valve 51 is increased until the condition that T2 is always greater than T1 during the continuous operation of the real-time frequency for 2 minutes is met.

[0098] In another embodiment, when the photovoltaic air conditioner is in heating mode and pure photovoltaic power supply mode, if the photovoltaic power supply is less than the power required for the operation of the photovoltaic air conditioner, the opening degree K1 of the first regulating valve 51 and the opening degree K3 of the third regulating valve 53 are adjusted to the maximum opening degree, while keeping the opening degree K2 of the second regulating valve 52 at 0. Then, the actual operating frequency F1 of the compressor 10 is compared with the required frequency F0 corresponding to the target exhaust temperature T1. When F0-F1∈(0,3]Hz, the indoor and outdoor fans of the photovoltaic air conditioner are operated at their original speeds; when F0-F1... When F0-F1 ∈ (3, 7] Hz, the speed of the indoor fan is reduced by 100 r / min, and the speed of the outdoor fan is reduced by 50 r / min; when F0-F1 ∈ (7, 15] Hz, the speed of the indoor fan is reduced by 150 r / min, and the speed of the outdoor fan is reduced by 100 r / min; when F0-F1 ∈ (15, F0) Hz, the indoor fan is set to silent mode, and the outdoor fan is set to low speed mode. A signal is sent to the user to prompt whether to increase the power supply from the AC mains side to avoid insufficient heating effect, which would otherwise affect the user's comfort.

[0099] In another embodiment, if the photovoltaic air conditioner is in heating mode and in a mixed power supply mode or a pure AC mains power supply mode, the opening of the regulating valve 50 is adjusted step by step according to the ambient temperature by detecting the ambient temperature.

[0100] Specifically, when T0 > 0℃, within 3 minutes of the photovoltaic air conditioner's startup, the compressor 10 is operated at the initial frequency F0, and the openings of the first regulating valve 51 and the third regulating valve 53 are controlled according to K1' = K1 + d*(T1 - T2) and K3' = K3 + e*T4, while keeping the opening K2 of the second regulating valve 52 at 0. After the photovoltaic air conditioner has been running for 3 minutes, the opening of the first regulating valve 51 is increased by 3P / min, and the frequency of the compressor 10 is decreased by 1Hz / min. The system then judges whether T2 is consistently greater than T1 during 2 minutes of continuous operation at the real-time frequency. If T2 is not consistently greater than T1 during 2 minutes of continuous operation at the real-time frequency, the compressor 10 frequency is not decreased, and the opening of the first regulating valve 51 is increased until the condition that T2 is consistently greater than T1 during 2 minutes of continuous operation at the real-time frequency is met.

[0101] When T0 < 0℃, within 3 minutes of the photovoltaic air conditioner starting up, the compressor 10 is operated at the initial frequency F0, and the openings of the first regulating valve 51 and the third regulating valve 53 are controlled according to K1' = K1 + d*(T1 - T2) and K3' = K3 + e*T4, while keeping the opening K2 of the second regulating valve 52 at 0. After the photovoltaic air conditioner has been running for 3 minutes, the opening of the first regulating valve 51 is increased by 3P / min, while maintaining the frequency of the compressor 10 unchanged. During this process, for every 15P increase in the opening of the first regulating valve 51, the internal speed of the compressor 10 is increased by 20 / min, until T4 ≥ 56℃, at which point the increase in the opening of the first regulating valve 51 is stopped.

[0102] Combination Figure 4 As shown, in one embodiment, the control method further includes steps S401 to S402.

[0103] S401. Determine whether the photovoltaic air conditioner needs to be defrosted based on the external pipe temperature. If the photovoltaic air conditioner needs to be defrosted, increase the opening of the first regulating valve 51 before the defrosting starts until the internal pipe temperature of the photovoltaic air conditioner rises to the preset temperature.

[0104] S402. When the photovoltaic air conditioner starts defrosting, close the second regulating valve 52 and the third regulating valve 53, adjust the opening of the first regulating valve 51 to the maximum, and adjust the frequency of the compressor 10 to increase the exhaust temperature.

[0105] In this embodiment, first, the external pipe temperature of the photovoltaic air conditioner is detected to determine whether the photovoltaic air conditioner is to be defrosted. If the determination result is that the photovoltaic air conditioner is to be defrosted, the opening degree of the first regulating valve 51 is increased before the photovoltaic air conditioner starts defrosting, until the internal pipe temperature of the photovoltaic air conditioner is raised to a preset temperature. For example, the internal pipe temperature T4 of the photovoltaic air conditioner can be raised to T4+3°C, then after the photovoltaic air conditioner starts defrosting, the second regulating valve 52 and the third regulating valve 53 are closed, and the opening degree of the first regulating valve 51 is adjusted to the maximum, so that the refrigerant flow in the first regulating branch is maximized, the high-temperature gas entering the condenser 31 is increased, and the frequency of the compressor 10 is adjusted, thereby increasing the discharge temperature of the photovoltaic air conditioner. Specifically, the initial frequency F0 of the compressor 10 at the start of defrosting can be set to 75Hz, and on the premise that the actual discharge temperature does not exceed 110°C, the frequency of the compressor 10 is adjusted until the discharge temperature reaches the maximum. In addition, the external fan of the photovoltaic air conditioner can be stopped during defrosting, and the internal fan of the air conditioner can be operated at the silent gear, so as to reduce the influence caused by the decrease of the indoor temperature during the defrosting process of the photovoltaic air conditioner.

[0106] In conjunction with Figure 5 as shown, in an embodiment, the step S401 includes steps S501 to S502.

[0107] S501. When the photovoltaic air conditioner is in the heating mode, detect the external pipe temperature of the compressor 10 and the change rate of the external pipe temperature;

[0108] S502. Compare the external pipe temperature with a preset frosting temperature. When the difference between the external pipe temperature and the frosting temperature meets a preset difference threshold, and the change rate of the external pipe temperature meets a preset change rate threshold, it is determined that the photovoltaic air conditioner is to be defrosted.

[0109] In this embodiment, when the air conditioner is in the heating mode, the external pipe temperature of the compressor 10 and the change rate of the external pipe temperature are detected, and then the external pipe temperature is compared with the preset frosting temperature. When the difference between the external pipe temperature and the frosting temperature meets the preset difference threshold, and the change rate of the external pipe temperature meets the preset change rate threshold, it is determined that the photovoltaic air conditioner is to be defrosted. Specifically, when the external pipe temperature T3 and the frosting temperature T5 satisfy the condition of T3 < T5+2°C, and the change rate ΔT3 of the external pipe temperature is greater than -0.5°C / min, it is determined that the photovoltaic air conditioner is to be defrosted.

[0110] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple; relevant parts can be referred to in the method section. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

[0111] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A photovoltaic air conditioner, characterized in that, The photovoltaic air conditioner includes: An air conditioning functional component, comprising: a compressor, a connecting valve, and a heat exchanger, wherein the compressor is connected to the heat exchanger via the connecting valve; and wherein the heat exchanger comprises a condenser and an evaporator. The vortex tube is connected to the compressor, the connecting valve and the heat exchanger respectively, and a regulating branch is formed from the vortex tube to the heat exchanger; A regulating valve is provided on the regulating branch; The regulating valve includes a first regulating valve, a second regulating valve, and a third regulating valve; the first regulating valve is disposed between the first vortex outlet end of the vortex tube and the first connecting end of the connecting valve, the second regulating valve is disposed between the second vortex outlet end of the vortex tube and the condenser, and the third regulating valve is disposed between the second vortex outlet end of the vortex tube and the evaporator. Also includes: The photovoltaic air conditioner is determined to be ready for defrosting based on the external pipe temperature. If the photovoltaic air conditioner is ready for defrosting, the opening of the first regulating valve is increased before the defrosting begins until the internal pipe temperature of the photovoltaic air conditioner rises to the preset temperature. When the photovoltaic air conditioner starts defrosting, close the second and third regulating valves, adjust the opening of the first regulating valve to the maximum, and adjust the compressor frequency to increase the exhaust temperature.

2. The photovoltaic air conditioner according to claim 1, characterized in that, The connecting valve has four connecting ends: a first connecting end, a second connecting end, a third connecting end, and a fourth connecting end; The first connecting end is connected to the vortex tube, the second connecting end is connected to the condenser, the third connecting end is connected to the evaporator, and the fourth connecting end is connected to the inlet end of the compressor. The compressor's outlet end is connected to the vortex tube.

3. The photovoltaic air conditioner according to claim 2, characterized in that, The vortex tube includes a vortex inlet end, a first vortex outlet end, and a second vortex outlet end. The vortex inlet end is connected to the outlet end of the compressor; A first regulating branch is formed from the first vortex outlet end, the first regulating valve, and finally to the first connecting end; a second regulating branch is formed from the second vortex outlet end, the second regulating valve, and finally to the condenser; and a third regulating branch is formed from the second vortex outlet end, the third regulating valve, and finally to the evaporator.

4. The photovoltaic air conditioner according to claim 3, characterized in that, The condenser includes a first condensation inlet end, a second condensation inlet end, and a condensation outlet end; the first condensation inlet end is connected to the second communication end, the second condensation inlet end is connected to the second regulating valve, and the condensation outlet end is connected to the evaporator; The evaporator includes an evaporation inlet end and an evaporation outlet end; the evaporation inlet end is connected to the third regulating valve and the condenser; the evaporation outlet end is connected to the third connecting end.

5. The photovoltaic air conditioner according to claim 4, characterized in that, It also includes an electronic expansion valve, which is disposed between the condensate outlet end and the evaporation inlet end; The inlet end of the electronic expansion valve is connected to the condenser outlet end, and the outlet end of the electronic expansion valve is connected to the evaporation inlet end. The third regulating valve is connected between the outlet end of the electronic expansion valve and the evaporation inlet end.

6. A control method, applied in a photovoltaic air conditioner as described in any one of claims 1-5, characterized in that, The control method includes: During the operation of the photovoltaic air conditioner, the current operating mode and power supply mode of the photovoltaic air conditioner are detected and the detection results are obtained; and it is determined whether the power of the photovoltaic air conditioner during operation meets the operating requirements and the judgment result is obtained; the operating mode includes cooling mode and heating mode, and the power supply mode includes pure photovoltaic power supply mode, hybrid power supply mode and pure AC mains power supply mode. The opening degree of the regulating valve in the regulating branch is adjusted according to the detection results and judgment results to regulate the operation of the photovoltaic air conditioner.

7. The control method according to claim 6, applied to a photovoltaic air conditioner according to any one of claims 3-5, characterized in that, The step of adjusting the opening degree of the regulating valve in the regulating branch according to the detection result and the judgment result to regulate the operation of the photovoltaic air conditioner includes: When the photovoltaic air conditioner is in cooling mode and pure photovoltaic power supply mode, if the photovoltaic power supply is greater than or equal to the power required for the operation of the photovoltaic air conditioner, the first regulating valve and the second regulating valve are opened, the third regulating valve is closed, and the opening degree of the first regulating valve and the second regulating valve and the frequency of the compressor are adjusted according to a preset range. When the photovoltaic air conditioner is in cooling mode and pure photovoltaic power supply mode, if the photovoltaic power supply is less than the power required for the operation of the photovoltaic air conditioner, the first and second regulating valves are opened to the maximum opening, the third regulating valve is closed, and the speed of the indoor fan and the outdoor fan are adjusted step by step according to the difference between the frequency of the compressor and the required frequency. When the photovoltaic air conditioner is in cooling mode and in a mixed power supply mode or a pure AC mains power supply mode, the ambient temperature is detected and the opening of the regulating valve is adjusted step by step according to the ambient temperature.

8. The control method according to claim 6, applied to a photovoltaic air conditioner according to any one of claims 3-5, characterized in that, The step of adjusting the opening of the regulating valve in the regulating branch according to the detection result and the judgment result to regulate the operation of the photovoltaic air conditioner further includes: When the photovoltaic air conditioner is in heating mode and pure photovoltaic power supply mode, if the photovoltaic power supply is greater than or equal to the power required for the operation of the photovoltaic air conditioner, the first regulating valve and the third regulating valve are opened, the second regulating valve is closed, and the opening degree of the first regulating valve and the third regulating valve are adjusted according to a preset range, as well as the frequency of the compressor is adjusted. When the photovoltaic air conditioner is in heating mode and pure photovoltaic power supply mode, if the photovoltaic power supply is less than the power required for the operation of the photovoltaic air conditioner, the first regulating valve and the third regulating valve are opened to the maximum opening, the second regulating valve is closed, and the speed of the indoor fan and the outdoor fan are adjusted step by step according to the difference between the frequency of the compressor and the required frequency. When the photovoltaic air conditioner is in heating mode and in mixed power supply mode or pure AC mains power supply mode, the ambient temperature is detected, and the opening degree of the first regulating valve and the third regulating valve are adjusted according to the ambient temperature, as well as the frequency and speed of the compressor.

9. The control method according to claim 6, applied to a photovoltaic air conditioner according to any one of claims 3-5, characterized in that, The method of determining whether a photovoltaic air conditioner needs defrosting based on the external pipe temperature includes: When the photovoltaic air conditioner is in heating mode, the external pipe temperature of the compressor and the rate of change of the external pipe temperature are detected. The external pipe temperature is compared with a preset frosting temperature. When the difference between the external pipe temperature and the frosting temperature meets a preset difference threshold, and the rate of change of the external pipe temperature meets a preset rate of change threshold, it is determined that the photovoltaic air conditioner needs to be defrosted.

Images