Photovoltaic air conditioner and control method

Abstract

The invention provides a photovoltaic air conditioner and a control method. The photovoltaic air conditioner comprises a compressor, an indoor heat exchanger, an outdoor heat exchanger, a main path throttling component and a photovoltaic power generation assembly. The compressor, the outdoor heat exchanger and the indoor heat exchanger are sequentially communicated; the main path throttling component is connected between the outdoor heat exchanger and the indoor heat exchanger; the photovoltaic power generation assembly is electrically connected with the compressor; the photovoltaic air conditioner further comprises a liquid storage device, a power generation plate heat exchange pipeline, a first pipeline, a second pipeline and a first valve. The power generation plate heat exchange pipeline is arranged on the photovoltaic power generation assembly; the liquid storage device is connected between the main path throttling component and the indoor heat exchanger; the two ends of the first pipeline are connected with the inlet end of the power generation plate heat exchange pipeline and the liquid storage device correspondingly. The two ends of the second pipeline are connected with the outlet end of the power generation plate heat exchange pipeline and the side, close to the compressor, of the indoor heat exchanger correspondingly. The first valve is arranged on the first pipeline. According to the photovoltaic air conditioner, the temperature of the photovoltaic panel can be controlled within a reasonable range so as to guarantee high power generation efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a photovoltaic air conditioning and a control method thereof. Background Art

[0002] In response to the country's low-carbon and environmentally friendly development, more and more clean energy is being developed and used, and solar energy is favored as a renewable clean energy. Air conditioners are high-energy consumption products among household appliances, and more and more air conditioners using photovoltaic power sources are entering people's lives. Since photovoltaic panels are installed outdoors, their power generation efficiency is easily affected by the environment. For example, snow and ice in winter, and high temperatures in summer make it difficult to dissipate heat, which will directly reduce their power generation efficiency. The existing technology usually removes snow by physical cleaning or electric heating. Such solutions have problems such as low efficiency and uncontrollable or high-grade energy waste. Summary of the invention

[0003] The first object of the present invention is to provide a photovoltaic air conditioner capable of controlling the temperature of a photovoltaic panel within a reasonable range to ensure a higher power generation efficiency.

[0004] The second object of the present invention is to provide another photovoltaic air conditioner which can quickly melt snow in winter and control the temperature of the photovoltaic panels within a reasonable range to ensure higher power generation efficiency.

[0005] The third object of the present invention is to provide a control method for the above-mentioned photovoltaic air conditioner.

[0006] The fourth object of the present invention is to provide another control method of the above-mentioned photovoltaic air conditioner.

[0007] To achieve the above-mentioned first purpose, the present invention provides a photovoltaic air conditioner, comprising a compressor, an indoor heat exchanger, an outdoor heat exchanger, a main throttling component and a photovoltaic power generation component; the compressor, the outdoor heat exchanger and the indoor heat exchanger are connected in sequence, and the main throttling component is connected between the outdoor heat exchanger and the indoor heat exchanger; the photovoltaic power generation component is electrically connected to the compressor; the photovoltaic air conditioner also includes a liquid reservoir, a power generation board heat exchange pipeline, a first pipeline, a second pipeline and a first valve; the power generation board heat exchange pipeline is arranged on the photovoltaic power generation component; the liquid reservoir is connected between the main throttling component and the indoor heat exchanger; the two ends of the first pipeline are respectively connected to the inlet end of the power generation board heat exchange pipeline and the liquid reservoir, and the two ends of the second pipeline are respectively connected to the outlet end of the power generation board heat exchange pipeline and the side of the indoor heat exchanger close to the compressor; the first valve is arranged on the first pipeline.

[0008] It can be seen from the above scheme that in a refrigeration environment, the outdoor ambient temperature is generally high, and the higher the working temperature of the photovoltaic power generation panel, the lower its power generation voltage and power. For example, the maximum power generation power Pmax is reached at 25°C, and it decays to about 90% Pmax at 50°C. The present invention adds a liquid reservoir, a heat exchange pipeline of the power generation panel, a first pipeline, a second pipeline and a first valve on the basis of the existing photovoltaic air conditioner, and sets the heat exchange pipeline of the power generation panel on the photovoltaic power generation assembly. The low-temperature and low-pressure refrigerant absorbs the heat generated by the photovoltaic power generation panel through the heat exchange pipeline of the power generation panel on the photovoltaic power generation assembly, thereby reducing its working temperature to avoid system fluctuations. In particular, when the compressor of the refrigeration system is not running at the highest frequency, and the actual photovoltaic power generation assembly alone is not enough to maintain the operation, in order to minimize the consumption of municipal electricity, the power of the photovoltaic power generation assembly can be increased by the scheme of the present invention through the refrigerant heat exchange and cooling method. In addition, by setting the liquid reservoir, the stable operation of the refrigeration system is guaranteed, and the refrigerant is prevented from entering the heat exchange pipeline of the power generation panel and affecting the operation of the refrigeration system.

[0009] A preferred solution is that the photovoltaic air conditioner also includes a third pipeline, and two ends of the third pipeline are respectively connected to the outlet end of the heat exchange pipeline of the power generation panel and the side of the outdoor heat exchanger close to the compressor.

[0010] It can be seen that by setting up the third pipeline, in the heating mode, the high-temperature and high-pressure refrigerant can enter the heat exchange pipeline of the power generation plate and then flow to the compressor through the third pipeline, thereby achieving the purpose of clearing ice and snow.

[0011] A further solution is that a second valve is provided on the second pipeline, and a third valve is provided on the third pipeline.

[0012] It can be seen that the second valve is used to control the on-off of the second pipeline, and the third valve is used to control the on-off of the third pipeline.

[0013] A preferred solution is that the photovoltaic power generation component includes more than two electrically connected photovoltaic power generation panels; the heat exchange pipeline of the power generation panel includes an inlet main section, a branch section, a heat exchange pipe section and an outlet main section; the number of branch sections and the number of heat exchange pipe sections are the same as the number of photovoltaic power generation panels, and the heat exchange pipe sections and photovoltaic power generation panels are arranged in a one-to-one correspondence; one heat exchange pipe section is arranged on a branch section, and the inlet end of each branch section is connected to the inlet main section, and the outlet end of each branch section is connected to the outlet main section.

[0014] It can be seen that multiple photovoltaic panels can improve the power generation efficiency, and a heat exchange pipe section is set corresponding to a photovoltaic panel, thereby improving the efficiency of clearing ice and snow.

[0015] A further solution is that a throttle valve is provided on at least one branch section, and the throttle valve is located on a side of the corresponding heat exchange pipe section close to the main pipe inlet section.

[0016] It can be seen that due to the different installation positions of the photovoltaic panels, there is a problem of different working conditions. By setting a separate throttle valve on each branch section, each throttle valve controls the flow of the corresponding branch section, so that the opening of the throttle valve can be adjusted according to the pipe temperature of the corresponding heat exchange pipe section to ensure a good ice and snow removal effect, while also avoiding excessive temperature affecting the operation of the photovoltaic panels.

[0017] To achieve the above-mentioned second purpose, the present invention provides another photovoltaic air conditioner, including a compressor, an indoor heat exchanger, an outdoor heat exchanger, a main throttling component and a photovoltaic power generation component; the compressor, the outdoor heat exchanger and the indoor heat exchanger are connected in sequence, and the main throttling component is connected between the outdoor heat exchanger and the indoor heat exchanger; the photovoltaic power generation component is electrically connected to the compressor; the photovoltaic air conditioner also includes a liquid reservoir, a power generation board heat exchange pipeline, a first pipeline, a third pipeline and a first valve; the power generation board heat exchange pipeline is arranged on the photovoltaic power generation component; the liquid reservoir is connected between the main throttling component and the indoor heat exchanger; the two ends of the first pipeline are respectively connected to the inlet end of the power generation board heat exchange pipeline and the liquid reservoir, and the two ends of the third pipeline are respectively connected to the outlet end of the power generation board heat exchange pipeline and the side of the outdoor heat exchanger close to the compressor; the first valve is arranged on the first pipeline.

[0018] It can be seen from the above scheme that when the ambient temperature is below zero for a long time, the photovoltaic power generation panel is easily covered with ice and snow and is difficult to remove. This state seriously affects the efficiency of the photovoltaic power generation assembly. The present invention adds a liquid reservoir, a power generation panel heat exchange pipeline, a first pipeline, a third pipeline and a first valve to the existing photovoltaic air conditioner, and sets the power generation panel heat exchange pipeline on the photovoltaic power generation assembly. The high-temperature and high-pressure refrigerant melts the ice and snow on the photovoltaic power generation panel through the power generation panel heat exchange pipeline on the photovoltaic power generation assembly. In addition, the setting of the liquid reservoir ensures the stable operation of the heating system and prevents the refrigerant from entering the power generation panel heat exchange pipeline and affecting the operation of the heating system.

[0019] To achieve the third purpose mentioned above, the present invention provides a control method for a photovoltaic air conditioner, which is applied to the above-mentioned photovoltaic air conditioner. The control method includes: in the cooling mode, determining whether the temperature of the heat exchange pipeline of the power generation panel or the temperature of the photovoltaic power generation component is higher than the first preset temperature; if so, opening the first valve.

[0020] It can be seen from this that the temperature of photovoltaic panels can be controlled by circulating air-conditioning refrigerant, thereby improving their power generation efficiency and the use effect of photovoltaic air conditioning.

[0021] A preferred solution is to open the first valve for a first preset time period and then determine whether the temperature of the heat exchange pipeline of the power generation panel or the temperature of the photovoltaic power generation component is lower than a second preset temperature; if so, close the first valve.

[0022] To achieve the fourth purpose mentioned above, the present invention provides another control method of a photovoltaic air conditioner, which is applied to the above-mentioned photovoltaic air conditioner. The control method includes: in the heating mode, after entering the ice and snow removal mode, the compressor remains in the on state and the first valve is opened.

[0023] It can be seen that the circulation of air-conditioning refrigerant can be used to remove ice and snow from photovoltaic power generation components.

[0024] A preferred solution is that after entering the ice and snow removal mode, the control method further includes: turning off the internal fan.

[0025] It can be seen that turning off the internal fan can reduce the heat exchange effect of the heat exchanger, thereby increasing the temperature of the refrigerant and improving the efficiency of ice and snow removal.

[0026] A preferred solution is that the photovoltaic power generation component includes more than two electrically connected photovoltaic power generation panels; the heat exchange pipeline of the power generation panel includes an inlet main section, a branch section, a heat exchange section and an outlet main section; the number of branch sections and the number of heat exchange sections are the same as the number of photovoltaic power generation panels, and the heat exchange sections and photovoltaic power generation panels are arranged in a one-to-one correspondence; one heat exchange section is arranged on a branch section, the inlet end of each branch section is connected to the inlet main section, and the outlet end of each branch section is connected to the outlet main section; a throttle valve is arranged on each branch section, and the throttle valve is located on the side of the corresponding heat exchange section close to the inlet main section; the control method also includes: after opening the first valve and continuing for a second preset time period, judging whether the temperature of each heat exchange section or the temperature of the photovoltaic power generation panel is higher than a third preset temperature; if so, closing the throttle valve corresponding to the heat exchange section or the photovoltaic power generation panel whose temperature is higher than the third preset temperature.

[0027] It can be seen that due to the different installation positions of the photovoltaic panels, there is a problem of different working conditions. By setting a separate throttle valve on each branch section, each throttle valve controls the flow of the corresponding branch section, so that the opening of the throttle valve can be adjusted according to the pipe temperature of the corresponding heat exchange pipe section to ensure a good ice and snow removal effect, while also avoiding excessive temperature affecting the operation of the photovoltaic panels.

[0028] A further solution is that the control method further includes: adjusting the opening of the corresponding throttle valve according to the temperature of each heat exchange pipe section or the temperature of each photovoltaic power generation panel.

[0029] It can be seen that each throttle valve independently controls the operating temperature of the corresponding photovoltaic panel to maximize the power generation efficiency of each photovoltaic panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of the photovoltaic power generation panel in the photovoltaic air conditioner embodiment of the present invention.

[0031] Figure 2It is a system block diagram of a photovoltaic air conditioner embodiment of the present invention.

[0032] Figure 3 yes Figure 2 A partial enlarged view of point A in the middle.

[0033] Figure 4 It is a schematic diagram of the structure of the photovoltaic power generation panel, the power generation panel heat exchange pipeline, the throttle valve and the temperature sensing package in the photovoltaic air conditioner embodiment of the present invention.

[0034] Figure 5 It is a flow chart in cooling mode in an embodiment of the control method of the photovoltaic air conditioner of the present invention.

[0035] Figure 6 It is a flow chart in the heating mode of the control method embodiment of the photovoltaic air conditioner of the present invention.

[0036] The present invention is further described below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0037] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present invention and its application or use. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present invention thorough and complete and to fully express the scope of the present invention to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, rather than as limitations.

[0038] The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0039] In the present invention, when a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other devices without an intermediate device, or may not be directly connected to the other devices but have an intermediate device.

[0040] All terms (including technical terms or scientific terms) used in the present invention have the same meanings as those understood by ordinary technicians in the field, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0041] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0042] See also Figures 1 to 4 The photovoltaic air conditioner of this embodiment includes a compressor 1, an indoor heat exchanger 2, an outdoor heat exchanger 3, an outdoor fan 31, an indoor fan 21, a main circuit throttling component 4, a photovoltaic power generation assembly 5, a liquid storage device 6, a power generation board heat exchange pipeline 7, a first pipeline 81, a second pipeline 82, a third pipeline 83, a first valve 91, a second valve 92 and a third valve 93. Preferably, the main circuit throttling component 4 is an electronic expansion valve, and the first valve 91, the second valve 92 and the third valve 93 are all solenoid valves. The outdoor fan 31 is arranged close to the outdoor heat exchanger 3, and the indoor fan 21 is arranged close to the indoor heat exchanger 2.

[0043] The photovoltaic power generation component 5 is electrically connected to the compressor 1 for supplying power to the compressor 1, etc. The compressor 1, the outdoor heat exchanger 3 and the indoor heat exchanger 2 are connected in sequence, the main throttling component 4 is connected between the outdoor heat exchanger 3 and the indoor heat exchanger 2, and the liquid storage tank 6 is connected between the main throttling component 4 and the indoor heat exchanger 2.

[0044] The power generation board heat exchange pipeline 7 is arranged on the photovoltaic power generation assembly 5, the two ends of the first pipeline 81 are respectively connected to the inlet end 701 of the power generation board heat exchange pipeline 7 and the liquid storage tank 6, the two ends of the second pipeline 82 are respectively connected to the outlet end 702 of the power generation board heat exchange pipeline 7 and the side of the indoor heat exchanger 2 close to the compressor 1, and the two ends of the third pipeline 83 are respectively connected to the outlet end 702 of the power generation board heat exchange pipeline 7 and the side of the outdoor heat exchanger 3 close to the compressor 1. The first valve 91 is arranged on the first pipeline 81, the second valve 92 is arranged on the second pipeline 82, and the third valve 93 is arranged on the third pipeline 83.

[0045] The photovoltaic power generation assembly 5 includes two or more photovoltaic power generation panels 50 that are electrically connected, and each photovoltaic power generation panel 50 is connected in series. Figure 1 As shown, the photovoltaic panel 50 includes a frame 51 and a protective glass 52, a first EVA film 53, a power generation sheet 55, a second EVA film 56 and a back plate 57 which are located in the frame 51 and are stacked in sequence.

[0046] The heat exchange pipe 7 of the power generation panel includes an inlet main section 71, a branch section 72, a heat exchange pipe section 73 and an outlet main section 74. The number of branch sections 72 and the number of heat exchange pipe sections 73 are the same as the number of photovoltaic power generation panels 50. The heat exchange pipe sections 73 and the photovoltaic power generation panels 50 are arranged in a one-to-one correspondence. The heat exchange pipe sections 73 are located between the first EVA film 53 and the power generation sheet 55 in the corresponding photovoltaic power generation panel 51. One heat exchange pipe section 73 is arranged on one branch section 72. The inlet end of each branch section 72 is connected to the inlet main section 71, and the outlet end of each branch section 72 is connected to the outlet main section 74. The heat exchange pipe section 73 includes a plurality of straight sections 731 and a plurality of U-shaped bend sections 732. Each straight section 731 is arranged in parallel, and two adjacent straight sections 731 are connected by a U-shaped bend section 732.

[0047] Each photovoltaic panel 50 is provided with a temperature sensing package 70 for detecting the temperature of the corresponding photovoltaic panel 50. Each branch section 72 is provided with a throttle valve 75, which is located on the side of the corresponding heat exchange pipe section 73 close to the main pipe inlet section 71. Preferably, each throttle valve 75 is an electronic expansion valve. Due to the different installation positions of each photovoltaic panel 50, there is a problem of causing differences in working conditions. By providing a separate throttle valve 75 on each branch section 72, each throttle valve 75 controls the flow of the corresponding branch section 72, so that the opening of the throttle valve 75 can be adjusted according to the pipe temperature of the corresponding heat exchange pipe section 73, to ensure a good ice and snow removal effect, and also to avoid the temperature being too high to affect the operation of the photovoltaic panel 50.

[0048] Conventionally installed photovoltaic panels 50 are easily affected by the installation environment during use, such as snow cover in winter and difficulty in heat dissipation due to high temperatures in summer. Multiple photovoltaic panels are generally connected in series, and there is a problem of different working conditions caused by different installation positions. It is known that the power generation efficiency of photovoltaic panels 50 after installation is mainly affected by factors such as light intensity, working temperature and vertical angle. The light intensity is affected by the region and cannot be controlled, while the vertical angle can be controlled by an adjustable bracket. The working temperature is related to its own heat generation and ambient temperature. If its working temperature can be effectively reduced, it will help improve its power generation efficiency. The control method of the photovoltaic air conditioner in this embodiment can realize the control of the temperature of the photovoltaic panel 50, and use the air conditioning refrigerant circulation to control the temperature of the photovoltaic panel 50, thereby improving its power generation efficiency and improving the use effect of the photovoltaic air conditioner.

[0049] Photovoltaic air conditioners are usually powered by a photovoltaic power generation assembly 5 formed by connecting multiple photovoltaic power generation panels 50 in series to meet the operating voltage and power input of the photovoltaic air conditioner. The number of photovoltaic power generation panels 50 connected in series is directly related to the workload of the air conditioning system. When the photovoltaic power generation assembly 5 is connected in parallel with the mains to power the photovoltaic air conditioner, the photovoltaic power generation assembly 5 system should be fully loaded as much as possible to reduce the input of the mains.

[0050] Specifically, the control method of the photovoltaic air conditioner in this embodiment includes the following steps:

[0051] See also Figure 5 In cooling mode, the outdoor ambient temperature is generally high, and the higher the working temperature of the photovoltaic panel 50, the lower the power generation voltage and power. For example, the maximum power generation power Pmax is achieved at 25°C, and it decays to about 90% of Pmax at 50°C. At this time, the compressor 1 starts to run, and the refrigerant from the compressor 1 enters the outdoor heat exchanger 3 through the four-way reversing valve 11, and the gas-liquid two-phase refrigerant is throttled and depressurized by the main throttling component 4 and enters the liquid reservoir 6. Part of the refrigerant flows out of the liquid reservoir 6 and enters the indoor heat exchanger 2 to adjust the indoor ambient temperature.

[0052] At this time, step S11 is first performed to obtain the temperature of each temperature sensing package 70, and to determine whether the temperature of at least one temperature sensing package 70 is higher than a first preset temperature. Optionally, the first preset temperature is 50°C.

[0053] If yes, then execute step S12, open the first valve 91 and the second valve 92, close the third valve 93, and adjust the opening of the throttle valve 75 on the corresponding branch section 72 according to the temperature of the temperature sensing package 70. The low-pressure refrigerant absorbs the heat generated by the photovoltaic power generation panel 50 through the heat exchange pipe section 73 in the photovoltaic power generation panel 50, thereby reducing its operating temperature. To avoid system fluctuations, preferably, the throttle valve 75 adjustment cycle is 60s. The temperature of the photovoltaic power generation panel 50 is controlled by circulating the air conditioning refrigerant, thereby improving its power generation efficiency and improving the use effect of the photovoltaic air conditioner.

[0054] Next, after the first valve 91 is opened for a first preset period of time, step S13 is executed to determine whether the temperature detected by each temperature sensing package 70 is lower than a second preset temperature. Optionally, the second preset temperature is 25°C.

[0055] If so, execute step S14 to close the corresponding throttle valve 75. When the temperature detected by each temperature sensing package 70 is lower than the second preset temperature, the first valve 91 can be closed. In order to avoid the attenuation of the use capacity caused by the increase in the load of the photovoltaic power generation component 5 in the refrigeration system, when the temperature difference between the indoor ambient temperature and the set temperature is large for a long time, the first valve 91, the second valve 92 and the third valve 93 should be closed to cut off the refrigerant circulation of the photovoltaic power generation component 5. When the refrigeration system compressor 1 is not running at the highest frequency, and the actual photovoltaic power generation component 5 alone is not enough to maintain the operation, in order to minimize the consumption of municipal electricity, the power of the photovoltaic power generation component 5 can be increased by cooling the temperature through refrigerant heat exchange in the above-mentioned way.

[0056] See also Figure 6In the heating mode, the outdoor temperature is low and there is no need to control the temperature through the air conditioning system. Generally, the first valve 91, the second valve 92 and the third valve 93 are all closed, and there is no refrigerant circulation in the photovoltaic power generation assembly 5. However, when the ambient temperature is below zero for a long time, the photovoltaic power generation panel 50 is easily covered with ice and snow and is difficult to remove. This state seriously affects the efficiency of the photovoltaic power generation assembly 5.

[0057] At this time, after entering the ice and snow removal mode, step S21 is executed, the compressor 1 remains in the open state, the internal fan 21 is closed, the first valve 91 and the third valve 93 are opened, the second valve 92 is closed, and the opening of the throttle valve 75 on the corresponding branch section 72 is adjusted according to the temperature of the temperature sensing package 70. Specifically, it can be determined whether the ice and snow are covered by detecting each temperature sensing package 70 and the maximum power generation power Pmax within a certain period of time, and then confirm whether to enter the ice and snow removal mode; or the control device issues an execution ice and snow removal instruction, and the photovoltaic air conditioner enters the ice and snow removal mode. At this time, the refrigerant from the compressor 1 enters the indoor heat exchanger 2 through the four-way reversing valve 11. After the high-temperature and high-pressure refrigerant enters the liquid storage 6, part of the refrigerant releases heat to the photovoltaic power generation panel 50 through the heat exchange pipe section 73 in the photovoltaic power generation panel 50, thereby melting the ice and snow on the corresponding photovoltaic power generation panel 50. At the same time, each throttle valve 75 is adjusted according to the feedback temperature of the corresponding branch temperature sensing package 70.

[0058] After the first valve 91 is opened for a second preset period of time, step S22 is executed to determine whether the temperature detected by each temperature sensing package 70 is higher than a third preset temperature.

[0059] If yes, it means that the corresponding branch section 72 does not need to be cleared of ice and snow, and step S23 is executed to close the throttle valve 75 of the branch section 72 corresponding to the temperature sensing package 70 whose temperature is higher than the third preset temperature. For example, if the temperature detected by the temperature sensing package 70 is lower than -10°C, the corresponding throttle valve 75 is adjusted to the maximum. When the temperature detected by the temperature sensing package 70 is greater than 10°C, after 30 seconds, the corresponding throttle valve 75 is closed, and the clearing of ice and snow on the surface of the corresponding photovoltaic panel 50 is completed.

[0060] As can be seen from the above, in a refrigeration environment, the outdoor ambient temperature is generally high, and the higher the working temperature of the photovoltaic power generation panel, the lower its power generation voltage and power. For example, the maximum power generation power Pmax is reached at 25°C, and it decays to about 90% Pmax at 50°C. The present invention adds a liquid storage device, a power generation panel heat exchange pipeline, a first pipeline, a second pipeline and a first valve on the basis of the existing photovoltaic air conditioner, and sets the power generation panel heat exchange pipeline on the photovoltaic power generation assembly. The low-temperature and low-pressure refrigerant absorbs the heat generated by the photovoltaic power generation panel through the power generation panel heat exchange pipeline on the photovoltaic power generation assembly, thereby reducing its working temperature to avoid system fluctuations. In particular, when the refrigeration system compressor is not running at the highest frequency, and the actual photovoltaic power generation assembly alone is not enough to maintain the operation, in order to minimize the consumption of municipal electricity, the power of the photovoltaic power generation assembly can be increased by the scheme of the present invention through the refrigerant heat exchange and cooling method. At the same time, when the ambient temperature is below zero for a long time, the photovoltaic power generation panel is easily covered with ice and snow and is not easy to remove. This state seriously affects the efficiency of the photovoltaic power generation assembly. The present invention adds a liquid storage device, a heat exchange pipeline of a power generation panel, a first pipeline, a third pipeline and a first valve to the existing photovoltaic air conditioner, and sets the heat exchange pipeline of the power generation panel on the photovoltaic power generation assembly. The high-temperature and high-pressure refrigerant melts the ice and snow on the photovoltaic power generation panel through the heat exchange pipeline of the power generation panel on the photovoltaic power generation assembly. In addition, the setting of the liquid storage device ensures the stable operation of the heating system, and prevents the refrigerant from entering the heat exchange pipeline of the power generation panel and affecting the operation of the heating system.

[0061] In addition, in other embodiments, a throttle valve may be provided on at least one branch section. Only one of the second pipeline and the third pipeline may be provided. For example, in areas where the ambient temperature is high all year round, there is no need to provide the third pipeline and the third valve, and the second valve may be provided as required; in areas where the ambient temperature is low all year round, there is no need to provide the second pipeline and the second valve, and the third valve may be provided as required. The temperature sensing package may also be provided on the corresponding heat exchange pipe section. The number of photovoltaic panels, branch sections, heat exchange pipe sections, throttle valves and temperature sensing packages may also be changed as required. In the heating mode, after entering the ice and snow removal mode, the internal fan may not be turned off, or the speed of the internal fan may be reduced so that the internal fan runs at the minimum wind speed or a speed lower than the minimum wind speed. The specific types of the main throttling component, the throttle valve and the switch valve may be selected as required. The above changes can also achieve the purpose of the present invention.

[0062] Finally, it should be emphasized that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. Photovoltaic air conditioner, including compressor, indoor heat exchanger, outdoor heat exchanger, main circuit throttling component and photovoltaic power generation assembly; The compressor, the outdoor heat exchanger and the indoor heat exchanger are connected in sequence, and the main path throttling component is connected between the outdoor heat exchanger and the indoor heat exchanger; The photovoltaic power generation assembly is electrically connected to the compressor; Features: The photovoltaic air conditioner also includes a liquid storage tank, a heat exchange pipeline of a power generation plate, a first pipeline, a second pipeline and a first valve; The power generation panel heat exchange pipeline is arranged on the photovoltaic power generation assembly; The liquid reservoir is connected between the main circuit throttling component and the indoor heat exchanger; The two ends of the first pipeline are respectively connected to the inlet end of the heat exchange pipeline of the power generation plate and the liquid storage tank, and the two ends of the second pipeline are respectively connected to the outlet end of the heat exchange pipeline of the power generation plate and the side of the indoor heat exchanger close to the compressor; The first valve is disposed on the first pipeline.

2. The photovoltaic air conditioner according to claim 1, Features: The photovoltaic air conditioner also includes a third pipeline, and two ends of the third pipeline are respectively connected to the outlet end of the power generation panel heat exchange pipeline and a side of the outdoor heat exchanger close to the compressor.

3. The photovoltaic air conditioner according to claim 2, Features: The second pipeline is provided with a second valve, and the third pipeline is provided with a third valve.

4. The photovoltaic air conditioner according to any one of claims 1 to 3, Features: The photovoltaic power generation assembly includes more than two electrically connected photovoltaic power generation panels; The heat exchange pipeline of the power generation plate includes an inlet main section, a branch section, a heat exchange section and an outlet main section; The number of the branch sections and the number of the heat exchange pipe sections are the same as the number of the photovoltaic power generation panels, and the heat exchange pipe sections and the photovoltaic power generation panels are arranged in a one-to-one correspondence; One heat exchange pipe section is arranged on one branch section, the inlet end of each branch section is connected to the inlet main section, and the outlet end of each branch section is connected to the outlet main section.

5. The photovoltaic air conditioner according to claim 4, Features: A throttle valve is provided on at least one of the branch sections, and the throttle valve is located on a side of the corresponding heat exchange pipe section close to the main pipe inlet section.

6. Photovoltaic air conditioner, including compressor, indoor heat exchanger, outdoor heat exchanger, main circuit throttling component and photovoltaic power generation assembly; The compressor, the outdoor heat exchanger and the indoor heat exchanger are connected in sequence, and the main path throttling component is connected between the outdoor heat exchanger and the indoor heat exchanger; The photovoltaic power generation assembly is electrically connected to the compressor; Features: The photovoltaic air conditioner also includes a liquid storage tank, a heat exchange pipeline of a power generation plate, a first pipeline, a third pipeline and a first valve; The power generation panel heat exchange pipeline is arranged on the photovoltaic power generation assembly; The liquid reservoir is connected between the main circuit throttling component and the indoor heat exchanger; The two ends of the first pipeline are respectively connected to the inlet end of the heat exchange pipeline of the power generation plate and the liquid storage tank, and the two ends of the third pipeline are respectively connected to the outlet end of the heat exchange pipeline of the power generation plate and the side of the outdoor heat exchanger close to the compressor; The first valve is disposed on the first pipeline.

7. Control method of photovoltaic air conditioning, It is characterized in that Applied to the photovoltaic air conditioner according to any one of claims 1 to 5, the control method comprises: In the cooling mode, determining whether the temperature of the heat exchange pipe of the power generation panel or the temperature of the photovoltaic power generation assembly is higher than a first preset temperature; If so, open the first valve.

8. The control method of the photovoltaic air conditioner according to claim 7, Features: After the first valve is opened for a first preset time period, determining whether the temperature of the heat exchange pipe of the power generation panel or the temperature of the photovoltaic power generation assembly is lower than a second preset temperature; If yes, close the first valve.

9. Control method of photovoltaic air conditioner, It is characterized in that Applied to the photovoltaic air conditioner according to claim 6, the control method comprises: In the heating mode, after entering the ice and snow removal mode, the compressor remains on and the first valve is opened.

10. The control method of the photovoltaic air conditioner according to claim 9, Features: After entering the ice and snow removal mode, the control method also includes: turning off the interior fan.

11. The control method of the photovoltaic air conditioner according to claim 9, Features: The photovoltaic power generation assembly includes more than two electrically connected photovoltaic power generation panels; The heat exchange pipeline of the power generation plate includes an inlet main section, a branch section, a heat exchange section and an outlet main section; The number of the branch sections and the number of the heat exchange pipe sections are the same as the number of the photovoltaic power generation panels, and the heat exchange pipe sections and the photovoltaic power generation panels are arranged in a one-to-one correspondence; One heat exchange pipe section is arranged on one branch section, the inlet end of each branch section is connected to the inlet main section, and the outlet end of each branch section is connected to the outlet main section; Each branch section is provided with a throttle valve, and the throttle valve is located on a side of the corresponding heat exchange pipe section close to the main pipe inlet section; The control method further comprises: After the first valve is opened for a second preset time period, determining whether the temperature of each of the heat exchange pipe segments or the temperature of the photovoltaic power generation panel is higher than a third preset temperature; If so, close the heat exchange pipe section whose temperature is higher than the third preset temperature or the throttle valve corresponding to the photovoltaic power generation panel.

12. The control method of the photovoltaic air conditioner according to claim 11, Features: The control method further includes: adjusting the opening of the corresponding throttle valve according to the temperature of each heat exchange pipe section or the temperature of each photovoltaic power generation panel.

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