Photovoltaic air conditioner and control method and control system thereof

Abstract

The invention discloses a photovoltaic air conditioner and a control method and system thereof, and belongs to the field of photovoltaic air conditioners. The photovoltaic air conditioner comprises an indoor unit, an outdoor unit and a dew point evaporative cooler, the dew point evaporative cooler comprises a water collecting device, a first channel and a second channel, the water collecting device is used for collecting condensate water of an indoor heat exchanger in the indoor unit, and outdoor air enters the first channel and is divided into primary air and secondary air; primary air enters a room after exchanging heat with the indoor heat exchanger, and secondary air enters the room after entering the second channel and making contact with condensate water in the water collecting device. The temperature of the condensate water is low, so that the secondary air becomes low-temperature and high-humidity gas after being in contact with the condensate water, and the temperature of the primary air can be reduced through heat exchange with the primary air, so that when the primary air reaches the set temperature, the cooling capacity needing to be provided by the indoor heat exchanger is reduced, and the energy can be saved when photovoltaic power supply is insufficient. The refrigeration effect of the air conditioner is improved.

Description

Technical Field

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

[0002] It is an inevitable trend to use clean energy to replace the existing energy model. The cost of photovoltaics is gradually decreasing, while the efficiency is constantly improving and improving. Household photovoltaics are doubling annually. The local consumption of photovoltaic power generation will become an increasingly important part, and photovoltaic air conditioners have emerged. Photovoltaic air conditioners can solve the problem of local consumption of some photovoltaics.

[0003] However, if the user chooses the pure photovoltaic power supply mode, the power supply mechanism will rely entirely on the output of the photovoltaic panels, thus eliminating the possibility of drawing power from the AC mains. Due to the instability of photovoltaic power supply, when the photovoltaic power supply is insufficient, insufficient cooling will occur. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the present application provides a photovoltaic air conditioner and a control method and control system thereof, so as to solve the problem that when the user selects the pure photovoltaic power supply mode, the power supply mechanism will completely rely on the output of the photovoltaic panel, thereby eliminating the possibility of drawing power from the AC mains side. Due to the instability of photovoltaic power supply, when the photovoltaic power supply is insufficient, it will cause the problem of insufficient cooling.

[0005] The technical solution adopted by this application to solve its technical problem is:

[0006] In a first aspect, a photovoltaic air conditioner is provided, comprising: an indoor unit, an outdoor unit and a dew point evaporative cooler;

[0007] The dew point evaporative cooler comprises a water collecting device, a first channel and a second channel;

[0008] The water collecting device is used to collect condensed water from the indoor heat exchanger in the indoor unit;

[0009] Outdoor air entering the first channel is divided into primary air and secondary air. The primary air enters the room after exchanging heat with the indoor heat exchanger, and the secondary air enters the second channel and contacts the condensed water in the water collection device before entering the room. After entering the second channel, the secondary air also exchanges heat with the primary air.

[0010] Furthermore, a primary fan and a primary air valve are provided on the first channel; the primary fan is used to deliver the primary air into the indoor heat exchanger; the primary air valve is used to control the amount of primary air in the first channel;

[0011] The second channel is provided with a secondary fan and a secondary air valve; the secondary fan is used to deliver the secondary air into the room; the secondary air valve is used to control the amount of secondary air in the second channel.

[0012] Further, it also includes: a water delivery channel;

[0013] The water supply channel is provided with a water pump, and the water pump is used to deliver the condensed water in the water collecting device into the second channel through the water supply channel.

[0014] Further, the second channel is connected to the return air outlet of the indoor unit;

[0015] The secondary air enters the room through the return air port.

[0016] In a second aspect, a photovoltaic air conditioner control method is provided, which is applied to the photovoltaic air conditioner mentioned above, and the method comprises:

[0017] When the photovoltaic air conditioner is in cooling mode, calculating the upper limit frequency of the compressor outer ring corresponding to the outdoor temperature;

[0018] When the actual operating frequency of the compressor is less than the upper limit frequency of the compressor outer ring, the rotation speed of the primary fan is determined based on the actual operating frequency and the upper limit frequency of the compressor outer ring, and the primary fan is used to adjust the flow rate of the primary air in the first channel; at the same time, the current stage is determined, and the primary air valve is controlled based on the current stage; the opening of the primary air valve is different, and the amount of primary air that can pass through the first channel per unit time is different;

[0019] When the current stage is the first stage, determining the target opening of the primary air valve based on the actual operating frequency and the upper limit frequency of the compressor outer ring, and controlling the opening of the primary air valve to be the target opening;

[0020] When the current stage is the second stage, the target first control interval is determined based on the temperature difference between the indoor temperature and the set temperature, and each of the first control intervals corresponds to a control logic; the primary air valve is controlled based on the target control logic corresponding to the target first control interval.

[0021] Further, the determining the current stage includes:

[0022] When the temperature difference is greater than the preset temperature difference, the current stage is the first stage;

[0023] When the temperature difference is less than or equal to the preset temperature difference, the current stage is the second stage.

[0024] Further, the determining the current stage includes:

[0025] Get the boot time;

[0026] If the power-on time is less than the preset power-on time, the current stage is the first stage;

[0027] If the power-on time is greater than or equal to the preset power-on time, the current stage is the second stage.

[0028] Further, the determining of the target first control interval based on the temperature difference between the indoor temperature and the set temperature includes:

[0029] When the temperature difference is greater than or equal to the first preset temperature value, the target first control interval is an emergency opening control area, and the control logic corresponding to the emergency opening control area is to increase the first preset opening degree every first preset time interval;

[0030] When the temperature difference is greater than or equal to the second preset temperature value and less than the first preset temperature value, the target first control interval is a slow-opening control area, and the control logic corresponding to the slow-opening control area is to prohibit the primary air valve from opening wider within a second preset time, and then allow the valve to open wider by a second preset opening degree at intervals of a third preset time, and the third preset time is greater than the first preset time;

[0031] When the temperature difference is greater than or equal to the third preset temperature value and less than the second preset temperature value, the target first control interval is a stable control area, and the control logic corresponding to the stable control area is to keep the opening of the primary air valve unchanged;

[0032] When the temperature difference is greater than or equal to the fourth preset temperature value and less than the third preset temperature, the target first control interval is a slow closing control area, and the control logic corresponding to the slow closing control area is that the temperature is prohibited from being closed within the fourth preset time, and then the third preset opening is allowed to be closed every fifth preset time;

[0033] When the temperature difference is less than the fourth preset temperature value, the target first control interval is a normal control area, and the control logic corresponding to the normal control area is to reduce the fourth preset opening every sixth preset time interval, and the sixth preset time is less than the fifth preset time.

[0034] Furthermore, it also includes:

[0035] Acquiring the indoor humidity;

[0036] Obtaining a target parameter based on the indoor humidity;

[0037] Determining a target second control interval based on a preset target parameter interval corresponding to the target parameter, each second control interval corresponding to a control logic;

[0038] The secondary air valve is controlled according to the target control logic corresponding to the target second control interval, and the opening of the secondary air valve is different, and the amount of secondary air that can pass through the second channel per unit time is different.

[0039] Further, obtaining the target parameter based on the indoor humidity includes:

[0040] When the user does not set the target humidity, the target parameter is the indoor humidity;

[0041] When the user sets the target humidity, the target parameter is the humidity difference between the indoor humidity and the set humidity.

[0042] Furthermore, it also includes:

[0043] When the user does not set the target humidity, get the current time;

[0044] Determine a target preset time interval corresponding to the current time, wherein the preset time interval includes at least two;

[0045] The preset target parameter interval to be used is determined according to the target preset time interval, and different preset target parameter intervals are used for different preset time intervals.

[0046] Further, the controlling of the secondary air valve according to the target control logic corresponding to the target second control interval includes:

[0047] When the target second control interval is an emergency opening control area, the control logic corresponding to the emergency opening control area is to increase the fifth preset opening degree every seventh preset time period;

[0048] When the target second control interval is a slow-opening control area, the control logic corresponding to the slow-opening control area is to prohibit the secondary air valve from opening wider within an eighth preset time, and then allow the valve to open wider by a sixth preset opening degree at intervals of a ninth preset time, wherein the ninth preset time is greater than the seventh preset time;

[0049] When the target second control interval is a stable control region, the control logic corresponding to the stable control region is to keep the secondary air valve opening unchanged;

[0050] When the target second control interval is a slow closing control area, the control logic corresponding to the slow closing control area is that the closing is prohibited within the tenth preset time, and then the seventh preset opening is allowed to be closed every eleventh preset time;

[0051] When the target second control interval is a normal control area, the control logic corresponding to the normal control area is to reduce the eighth preset opening degree every twelfth preset time period, and the twelfth preset time period is less than the tenth preset time period.

[0052] In a third aspect, a photovoltaic air conditioning control system is provided, comprising:

[0053] at least one processor and at least one memory;

[0054] The memory stores executable instructions of the processor;

[0055] The processor is configured to execute the above photovoltaic air conditioning control method.

[0056] Beneficial effects:

[0057] The technical solution of the present application provides a photovoltaic air conditioner and its control method and control system. The photovoltaic air conditioner includes an indoor unit, an outdoor unit and a dew-point evaporative cooler. The dew-point evaporative cooler includes a water collecting device, a first channel and a second channel. The water collecting device is used to collect the condensed water of the indoor heat exchanger in the indoor unit. The outdoor air enters the first channel and is divided into primary air and secondary air. The primary air enters the room after heat exchange with the indoor heat exchanger, and the secondary air enters the room after contacting the condensed water in the water collecting device. The condensed water temperature is relatively low, so the secondary air becomes a low-temperature and high-humidity gas after contacting the condensed water. After heat exchange with the primary air, the temperature of the primary air can be reduced. In this way, when the primary air reaches the set temperature, the amount of cooling required to be provided by the indoor heat exchanger is reduced. Therefore, when the photovoltaic power supply is insufficient, the cooling effect of the air conditioner can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0059] Figure 1 This is a schematic diagram of a photovoltaic air conditioner structure provided in an embodiment of the present application;

[0060] Figure 2 This is a flow chart of a photovoltaic air conditioning control method provided in an embodiment of the present application;

[0061] Figure 3 It is a schematic diagram of the structure of a photovoltaic air conditioning control system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0062] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application is described in detail below in conjunction with the accompanying drawings and embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other implementation methods obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0063] The photovoltaic air conditioning system includes photovoltaic air conditioning, photovoltaic battery group, and dew point evaporative cooler. The photovoltaic battery group converts solar energy into electrical energy and supplies it to the photovoltaic air conditioning. The conventional control method is to give priority to photovoltaic power supply. When the photovoltaic power supply is insufficient, the AC mains power supply is used to ensure the normal operation of the photovoltaic air conditioning.

[0064] But in reality, if the user encounters a power outage and is unable to draw power from the AC mains, he can only choose the pure photovoltaic power supply mode, or some users specifically turn on the pure photovoltaic power supply mode to save electricity.

[0065] If the user chooses the pure photovoltaic power supply mode, the power supply mechanism will rely entirely on the output of the photovoltaic panels, thus eliminating the possibility of drawing power from the AC mains. In this mode, the power supply is directly subject to the lighting conditions at the time and the layout area of ​​the photovoltaic panels, which may cause the air conditioning system compressor to be unable to reach the operating frequency that can be achieved under normal power supply conditions. Given that the compressor frequency is closely related to the ambient temperature control, this will inevitably lead to a reduction in cooling efficiency, thereby affecting the quality of the cooling experience.

[0066] To solve this problem, refer to Figure 1 , an embodiment of the present application provides a photovoltaic air conditioner, comprising: an indoor unit and an outdoor unit and a dew point evaporative cooler;

[0067] The dew point evaporative cooler comprises a water collecting device, a first channel and a second channel;

[0068] The water collecting device is used to collect condensed water from the indoor heat exchanger in the indoor unit; it should be noted that although Figure 1 The water collecting device is arranged in the dew point cooling evaporator, but in fact the water collecting device can also be arranged outside the dew point cooling evaporator, such as directly below the indoor heat exchanger.

[0069] Outdoor air entering the first channel is divided into primary air and secondary air. The primary air enters the room after exchanging heat with the indoor heat exchanger, and the secondary air enters the second channel and contacts the condensed water in the water collection device before entering the room. After entering the second channel, the secondary air also exchanges heat with the primary air.

[0070] As a preferred implementation of the embodiment of the present application, a primary fan and a primary air valve are provided on the first channel; the primary fan is used to deliver the primary air into the indoor heat exchanger; the primary air valve is used to control the amount of primary air in the first channel;

[0071] The second channel is provided with a secondary fan and a secondary air valve; the secondary fan is used to deliver the secondary air into the room; the secondary air valve is used to control the amount of secondary air in the second channel.

[0072] In one embodiment, it further comprises: a water delivery channel;

[0073] The water supply channel is provided with a water pump, and the water pump is used to deliver the condensed water in the water collecting device into the second channel through the water supply channel.

[0074] In another embodiment, the air in the second channel is introduced into the water collecting device and then sent into the room.

[0075] As a preferred implementation of the embodiment of the present application, the second channel is connected to the return air outlet of the indoor unit;

[0076] The secondary air enters the room through the return air port.

[0077] Of course, in practice, a filter may be provided in the second channel, and the air passing through the filter may be introduced directly into the room without passing through the return air outlet of the indoor unit.

[0078] Dew point evaporative cooler cools outdoor air into primary air and secondary air. Figure 1 The structure shown, its principle and specific implementation are introduced as follows:

[0079] The dew point evaporative cooler (hereinafter referred to as the cooler) includes a water pump, a water collecting device, a first channel, a second channel, a primary fan, a primary air valve, a secondary fan, and a secondary air valve.

[0080] The cooler is working, and the outside air enters the first channel of the cooler. At this time, the water pump starts to work and sprays the water in the water collection device into the second channel. There is a water pipe in the water collection device connected to the water receiving tray of the indoor unit, which can directly guide the condensed water into the water collection device. At the same time, water can also be artificially injected into the water collection device. At this time, the air in the second channel is secondary air. After the primary air in the first channel is cooled by isohumidity, part of the air in the first channel enters the second channel and mixes with the secondary air. The secondary air can continue to cool down, and the cycle is repeated until the primary air temperature is close to the dew point temperature. Then the primary air can enter the indoor unit through the first channel and exchange heat with the indoor heat exchanger before entering the room. In this way, due to the lower temperature of the primary air, compared with the indoor air, the indoor heat exchanger can further reduce the indoor temperature when the same cooling capacity is paid by the steam indoor heat exchanger. The secondary air enters the room through the second channel. Since the humidity in the secondary air is higher, the indoor humidity can be adjusted.

[0081] The photovoltaic air conditioner provided in the embodiment of the present application includes an indoor unit and an outdoor unit and a dew point evaporative cooler. The dew point evaporative cooler includes a water collection device, a first channel and a second channel. The water collection device is used to collect condensed water from the indoor heat exchanger in the indoor unit. The outdoor air enters the first channel and is divided into primary air and secondary air. The primary air enters the room after heat exchange with the indoor heat exchanger, and the secondary air enters the room after contacting the condensed water in the water collection device. The condensed water temperature is relatively low, so the secondary air becomes a low-temperature and high-humidity gas after contacting the condensed water. After heat exchange with the primary air, the temperature of the primary air can be reduced. In this way, when the primary air reaches the set temperature, the amount of cooling required to be provided by the indoor heat exchanger is reduced, so the cooling effect of the air conditioner can be improved when the photovoltaic power supply is insufficient.

[0082] Based on the same inventive concept, the embodiment of the present application also provides a photovoltaic air conditioner control method, which is applied to the photovoltaic air conditioner provided in the above embodiment, such as Figure 2 As shown, the method includes:

[0083] S11: When the photovoltaic air conditioner is cooling, the upper limit frequency of the compressor outer ring corresponding to the outdoor temperature is calculated; wherein the corresponding relationship between the outdoor temperature and the upper limit deviation of the compressor outer ring is set in advance and can be obtained from big data analysis or actual testing.

[0084] S12: when the actual operating frequency of the compressor is less than the upper limit frequency of the compressor outer ring, the rotation speed of the primary fan is determined based on the actual operating frequency and the upper limit frequency of the compressor outer ring, and the primary fan is used to adjust the flow rate of the primary air in the first channel; at the same time, the current stage is determined, and the primary air valve is controlled based on the current stage; the opening of the primary air valve is different, and the amount of primary air that can pass through the first channel per unit time is different;

[0085] As a preferred implementation of the embodiment of the present application, determining the rotation speed of the primary fan based on the actual operating frequency and the upper limit frequency of the compressor outer ring includes:

[0086] The speed of the primary fan = (compressor outer ring upper limit frequency - actual operating frequency) / compressor outer ring upper limit frequency * primary fan maximum speed.

[0087] In practice, the speed of the primary fan can also be determined according to the following formula:

[0088] The speed of the primary fan = (compressor outer ring upper limit frequency - actual operating frequency) / preset frequency value * maximum speed of the primary fan. The preset frequency value is a fixed value.

[0089] In one embodiment, determining the current stage includes:

[0090] When the temperature difference is greater than the preset temperature difference, the current stage is the first stage;

[0091] When the temperature difference is less than or equal to the preset temperature difference, the current stage is the second stage.

[0092] In another embodiment, determining the current stage includes:

[0093] Get the boot time;

[0094] If the power-on time is less than the preset power-on time, the current stage is the first stage;

[0095] If the power-on time is greater than or equal to the preset power-on time, the current stage is the second stage.

[0096] S13: when the current stage is the first stage, determining the target opening of the primary air valve based on the actual operating frequency and the upper limit frequency of the compressor outer ring, and controlling the opening of the primary air valve to be the target opening;

[0097] Specifically, target opening = (compressor outer ring upper limit frequency - actual operating frequency) / compressor outer ring upper limit frequency * maximum opening of primary air valve.

[0098] In practice, the speed of the primary fan can also be determined according to the following formula:

[0099] The speed of the primary fan = (compressor outer ring upper limit frequency - actual operating frequency) / preset frequency value * maximum opening of the primary air valve. The preset frequency value is a fixed value.

[0100] S14: When the current stage is the second stage, a target first control interval is determined based on the temperature difference between the indoor temperature and the set temperature, each of the first control intervals corresponds to a control logic; and the primary air valve is controlled based on the target control logic corresponding to the target first control interval.

[0101] The step of determining the target first control interval based on the temperature difference between the indoor temperature and the set temperature includes:

[0102] When the temperature difference is greater than or equal to the first preset temperature value, the target first control interval is an emergency opening control area, and the control logic corresponding to the emergency opening control area is to increase the first preset opening degree every first preset time interval;

[0103] When the temperature difference is greater than or equal to the second preset temperature value and less than the first preset temperature value, the target first control interval is a slow-opening control area, and the control logic corresponding to the slow-opening control area is to prohibit the primary air valve from opening wider within a second preset time, and then allow the valve to open wider by a second preset opening degree at intervals of a third preset time, and the third preset time is greater than the first preset time;

[0104] When the temperature difference is greater than or equal to the third preset temperature value and less than the second preset temperature value, the target first control interval is a stable control area, and the control logic corresponding to the stable control area is to keep the opening of the primary air valve unchanged;

[0105] When the temperature difference is greater than or equal to the fourth preset temperature value and less than the third preset temperature, the target first control interval is a slow closing control area, and the control logic corresponding to the slow closing control area is that the temperature is prohibited from being closed within the fourth preset time, and then the third preset opening is allowed to be closed every fifth preset time;

[0106] When the temperature difference is less than the fourth preset temperature value, the target first control interval is a normal control area, and the control logic corresponding to the normal control area is to reduce the fourth preset opening every sixth preset time interval, and the sixth preset time is less than the fifth preset time.

[0107] As a preferred implementation method of the embodiment of the present application, it also includes:

[0108] Acquiring the indoor humidity;

[0109] Obtaining a target parameter based on the indoor humidity;

[0110] Determining a target second control interval based on a preset target parameter interval corresponding to the target parameter, each second control interval corresponding to a control logic;

[0111] The secondary air valve is controlled according to the target control logic corresponding to the target second control interval, and the opening of the secondary air valve is different, and the amount of secondary air that can pass through the second channel per unit time is different.

[0112] Wherein, obtaining the target parameter based on the indoor humidity includes:

[0113] When the user does not set the target humidity, the target parameter is the indoor humidity;

[0114] When the user sets the target humidity, the target parameter is the humidity difference between the indoor humidity and the set humidity.

[0115] Further, when the user does not set the target humidity, the current time is obtained;

[0116] Determine a target preset time interval corresponding to the current time, wherein the preset time interval includes at least two; exemplarily, daytime and nighttime, and the time division of daytime and nighttime is set according to actual needs.

[0117] The preset target parameter interval to be used is determined according to the target preset time interval, and different preset target parameter intervals are used for different preset time intervals.

[0118] As a preferred implementation method of the embodiment of the present application, the secondary air valve is controlled according to the target control logic corresponding to the target second control interval, including:

[0119] When the target second control interval is an emergency opening control area, the control logic corresponding to the emergency opening control area is to increase the fifth preset opening degree every seventh preset time period;

[0120] When the target second control interval is a slow-opening control area, the control logic corresponding to the slow-opening control area is to prohibit the secondary air valve from opening wider within an eighth preset time, and then allow the valve to open wider by a sixth preset opening degree at intervals of a ninth preset time, wherein the ninth preset time is greater than the seventh preset time;

[0121] When the target second control interval is a stable control region, the control logic corresponding to the stable control region is to keep the secondary air valve opening unchanged;

[0122] When the target second control interval is a slow closing control area, the control logic corresponding to the slow closing control area is that the closing is prohibited within the tenth preset time period, and then the seventh preset opening is allowed to be closed every eleventh preset time period;

[0123] When the target second control interval is a normal control area, the control logic corresponding to the normal control area is to reduce the eighth preset opening every twelfth preset time period, and the twelfth preset time period is less than the tenth preset time period.

[0124] It should be noted that the specific values ​​of the first preset time length to the twelfth preset time length in the present application are set according to actual needs. The specific values ​​of the first preset opening degree to the second preset opening degree are set according to actual needs.

[0125] It should be noted that when the actual operating frequency of the compressor is greater than or equal to the upper limit frequency of the compressor outer ring, the primary fan speed is increased to the maximum primary fan speed, and the primary air valve opening is opened to the maximum primary air valve opening.

[0126] The photovoltaic air conditioning control method provided in the embodiment of the present application can control the opening of the primary fan and the primary air valve according to the actual operating frequency of the compressor when the photovoltaic power supply is insufficient, and can ensure that the low-temperature primary air is fully heat-exchanged with the indoor heat exchanger to improve the cooling effect. At the same time, the opening of the secondary air valve is controlled according to different stages of the air conditioning to ensure that the indoor humidity meets the demand, which greatly improves the user experience.

[0127] In order to further illustrate the present application scheme, a specific implementation method is provided below. In order to ensure the reasonable operation of the air conditioner and the dew point evaporative cooler in the pure photovoltaic power supply mode, the following operation mode and logic are specially formulated:

[0128] Texternal: external environment temperature; Tinner: internal environment temperature; Tinner tube: evaporator middle temperature; Touter tube: condenser middle temperature; Tset: user set temperature; Prunning: actual operating frequency of compressor; Pup: upper limit frequency corresponding to compressor outer ring; B1: primary air valve opening; Bmax: maximum opening of primary air valve; R: actual speed of primary fan; Rmax: maximum speed of primary fan.

[0129] (1) When the photovoltaic power supply can fully meet the operating frequency required by the compressor, it is judged that Prunning ≥ Pup. Because in the current air-conditioning operation logic, in order to achieve the best cooling effect, the compressor will actually run to the upper limit frequency corresponding to the outer loop, that is, Pup.

[0130] In order to realize the on-site consumption of photovoltaic electricity, the primary fan speed of the cooler is increased to the maximum value, and the primary air valve opening is opened to the maximum to increase the temperature drop rate and improve the cooling comfort.

[0131] (2) When the photovoltaic power supply cannot meet the operating frequency required by the compressor, it is determined that Prunning < Pup.

[0132] At this time, the control method of primary fan speed and primary air valve opening is as follows:

[0133] R = [(Pup - Prun) / Pup] * Rmax;

[0134] Within three minutes of starting up, the B1 control method performs open-loop control as follows:

[0135] B1 = [(Pup - Prun) / Pup] * Bmax;

[0136] The reason why the primary fan speed and the primary air valve opening are not opened to the maximum is that the pipe temperature will drop too quickly, causing the compressor to reach the temperature point quickly, resulting in frequent shutdowns and poor comfort.

[0137] Three minutes after startup, the B1 control method performs closed-loop control as shown in Table 1:

[0138] Table 1

[0139]

[0140] When the photovoltaic air conditioner turns on the cooling mode, the cooler starts working at the same time. The working mode and control method are as follows:

[0141] Secondary air is a mixture of relatively low-temperature air and water vapor. It is used as a humidity supplement for the indoor side and enters the return air of the indoor unit through the secondary fan. The specific control method is as follows:

[0142] (1) The user does not set the humidity:

[0143] At this time, the real-time time is confirmed through networking. When it is between 7:00 and 21:00, the default humidity range is 50% to 60%; when it is between 21:00 and 7:00 the next day, the default humidity range is 60% to 70%. The specific control is shown in Table 2:

[0144] Table 2

[0145]

[0146]

[0147] (2) User-set humidity:

[0148] Assume that the user sets the humidity to S0, and the control method is shown in Table 3:

[0149] Table 3

[0150]

[0151]

[0152] The specific photovoltaic air conditioning control method provided in the embodiment of the present application can achieve optimal control by adjusting the flow of primary air and secondary air in the dew point evaporative cooler under different temperatures and humidities. By cleverly utilizing the characteristics of photovoltaic energy, in addition to powering the air conditioner body, it can also power the fan and water pump corresponding to the cooler, providing other ways to consume photovoltaic electricity on site. In the case of insufficient light, dew point evaporative cooling can meet the original refrigeration needs and improve comfort. By allowing secondary air to enter the return air port, the indoor humidity can be intelligently adjusted to improve comfort.

[0153] Based on the same inventive concept, Figure 3 As shown, the present application also provides a photovoltaic air conditioning control system 30, including:

[0154] at least one processor 31 and at least one memory 32;

[0155] The memory stores executable instructions of the processor;

[0156] The processor is configured to execute the photovoltaic air conditioning control method provided in the above embodiment.

[0157] The photovoltaic air conditioning control system provided by the embodiment of the present application stores executable instructions of the processor in the memory. When the executable instructions are executed, the processor can control the opening of the primary fan and the primary air valve according to the actual operating frequency of the compressor when the photovoltaic power supply is insufficient, so as to ensure that the low-temperature primary air is fully heat-exchanged with the indoor heat exchanger and improve the cooling effect. At the same time, the opening of the secondary air valve is controlled according to different stages of the air conditioning to ensure that the indoor humidity meets the demand, which greatly improves the user experience.

[0158] It should be noted that, in the description of this application, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" refers to at least two.

[0159] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

Claims

1. A photovoltaic air conditioner, characterized in that: include: Indoor and outdoor units and dew point evaporative coolers; The dew point evaporative cooler comprises a water collecting device, a first channel and a second channel; The water collecting device is used to collect condensed water from the indoor heat exchanger in the indoor unit; Outdoor air entering the first channel is divided into primary air and secondary air. The primary air enters the room after exchanging heat with the indoor heat exchanger, and the secondary air enters the second channel and contacts the condensed water in the water collection device before entering the room. After entering the second channel, the secondary air also exchanges heat with the primary air.

2. The photovoltaic air conditioner according to claim 1, characterized in that: The first channel is provided with a primary fan and a primary air valve; the primary fan is used to send the primary air into the indoor heat exchanger; the primary air valve is used to control the amount of primary air in the first channel; The second channel is provided with a secondary fan and a secondary air valve; the secondary fan is used to deliver the secondary air into the room; the secondary air valve is used to control the amount of secondary air in the second channel.

3. The photovoltaic air conditioner according to claim 1, characterized in that: Also includes: water supply channel; The water supply channel is provided with a water pump, and the water pump is used to deliver the condensed water in the water collecting device into the second channel through the water supply channel.

4. The photovoltaic air conditioner according to claim 1, characterized in that: The second channel is connected to the return air outlet of the indoor unit; The secondary air enters the room through the return air port.

5. A photovoltaic air conditioning control method, characterized in that: Applied to the photovoltaic air conditioner according to any one of claims 1 to 4, the method comprises: When the photovoltaic air conditioner is in cooling mode, calculating the upper limit frequency of the compressor outer ring corresponding to the outdoor temperature; When the actual operating frequency of the compressor is less than the upper limit frequency of the compressor outer ring, the rotation speed of the primary fan is determined based on the actual operating frequency and the upper limit frequency of the compressor outer ring, and the primary fan is used to adjust the flow rate of the primary air in the first channel; at the same time, the current stage is determined, and the primary air valve is controlled based on the current stage; the opening of the primary air valve is different, and the amount of primary air that can pass through the first channel per unit time is different; When the current stage is the first stage, determining the target opening of the primary air valve based on the actual operating frequency and the upper limit frequency of the compressor outer ring, and controlling the opening of the primary air valve to be the target opening; When the current stage is the second stage, the target first control interval is determined based on the temperature difference between the indoor temperature and the set temperature, and each of the first control intervals corresponds to a control logic; the primary air valve is controlled based on the target control logic corresponding to the target first control interval.

6. The method according to claim 5, characterized in that: Determining the current stage includes: When the temperature difference is greater than the preset temperature difference, the current stage is the first stage; When the temperature difference is less than or equal to the preset temperature difference, the current stage is the second stage.

7. The method according to claim 5, characterized in that: Determining the current stage includes: Get the boot time; If the power-on time is less than the preset power-on time, the current stage is the first stage; If the power-on time is greater than or equal to the preset power-on time, the current stage is the second stage.

8. The method according to claim 5, characterized in that: The step of determining the target first control interval based on the temperature difference between the indoor temperature and the set temperature includes: When the temperature difference is greater than or equal to the first preset temperature value, the target first control interval is an emergency opening control area, and the control logic corresponding to the emergency opening control area is to increase the first preset opening degree every first preset time interval; When the temperature difference is greater than or equal to the second preset temperature value and less than the first preset temperature value, the target first control interval is a slow-opening control area, and the control logic corresponding to the slow-opening control area is to prohibit the primary air valve from opening wider within a second preset time, and then allow the valve to open wider by a second preset opening degree at intervals of a third preset time, and the third preset time is greater than the first preset time; When the temperature difference is greater than or equal to the third preset temperature value and less than the second preset temperature value, the target first control interval is a stable control area, and the control logic corresponding to the stable control area is to keep the opening of the primary air valve unchanged; When the temperature difference is greater than or equal to the fourth preset temperature value and less than the third preset temperature, the target first control interval is a slow closing control area, and the control logic corresponding to the slow closing control area is that the temperature is prohibited from being closed within the fourth preset time, and then the third preset opening is allowed to be closed every fifth preset time; When the temperature difference is less than the fourth preset temperature value, the target first control interval is a normal control area, and the control logic corresponding to the normal control area is to reduce the fourth preset opening every sixth preset time interval, and the sixth preset time is less than the fifth preset time.

9. The method according to claim 5, characterized in that Also includes: Acquiring the indoor humidity; Obtaining a target parameter based on the indoor humidity; Determining a target second control interval based on a preset target parameter interval corresponding to the target parameter, each second control interval corresponding to a control logic; The secondary air valve is controlled according to the target control logic corresponding to the target second control interval, and the opening of the secondary air valve is different, and the amount of secondary air that can pass through the second channel per unit time is different.

10. The method according to claim 9, characterized in that The obtaining of a target parameter based on the indoor humidity comprises: When the user does not set the target humidity, the target parameter is the indoor humidity; When the user sets the target humidity, the target parameter is the humidity difference between the indoor humidity and the set humidity.

11. The method according to claim 9, characterized in that Also includes: When the user does not set the target humidity, get the current time; Determine a target preset time interval corresponding to the current time, wherein the preset time interval includes at least two; The preset target parameter interval to be used is determined according to the target preset time interval, and different preset target parameter intervals are used for different preset time intervals.

12. The method according to claim 9, characterized in that The controlling of the secondary air valve according to the target control logic corresponding to the target second control interval includes: When the target second control interval is an emergency opening control area, the control logic corresponding to the emergency opening control area is to increase the fifth preset opening degree every seventh preset time period; When the target second control interval is a slow-opening control area, the control logic corresponding to the slow-opening control area is to prohibit the secondary air valve from opening wider within an eighth preset time, and then allow the valve to open wider by a sixth preset opening degree at intervals of a ninth preset time, wherein the ninth preset time is greater than the seventh preset time; When the target second control interval is a stable control region, the control logic corresponding to the stable control region is to keep the secondary air valve opening unchanged; When the target second control interval is a slow closing control area, the control logic corresponding to the slow closing control area is that the closing is prohibited within the tenth preset time period, and then the seventh preset opening is allowed to be closed every eleventh preset time period; When the target second control interval is a normal control area, the control logic corresponding to the normal control area is to reduce the eighth preset opening every twelfth preset time period, and the twelfth preset time period is less than the tenth preset time period.

13. A photovoltaic air conditioning control system, characterized in that: include: at least one processor and at least one memory; The memory stores executable instructions of the processor; The processor is configured to execute the method according to any one of claims 5 to 12.

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