Multi-connected fresh air system
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- QINGDAO HISENSE HITACHI AIR CONDITIONING SYST
- Filing Date
- 2022-10-31
- Publication Date
- 2026-07-03
Smart Images
Figure CN115682189B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of air conditioning technology, and more particularly to a multi-split fresh air system. Background Technology
[0002] With increasing user demands for indoor air quality, fresh air systems are widely used. During operation, indoor exhaust air and outdoor fresh air flow through the total heat exchange core in a cross-flow manner. Due to the temperature difference and vapor pressure difference between the airflows on both sides of the airflow partition, the two airflows exhibit heat and mass transfer phenomena when passing through the partition, causing a total heat exchange process. In addition, a purification module is often installed at the outdoor fresh air inlet to provide fresh air quality.
[0003] During summer operation, the fresh air gains cooling from the indoor return air, lowering its temperature, and is simultaneously dried by the air conditioning, reducing its moisture content. During winter operation, the fresh air gains heat from the indoor return air, raising its temperature. In this way, through the total heat exchange process of the total heat exchange core, the fresh air recovers energy from the indoor return air.
[0004] In existing multi-split air conditioning systems, if users introduce a fresh air unit, the introduction of fresh air will cause fluctuations in indoor air temperature and humidity, causing discomfort to users. Summary of the Invention
[0005] This invention provides a multi-split fresh air system that integrates a fresh air unit and multiple indoor units, thereby addressing the impact of fresh air load on indoor temperature and humidity fluctuations, improving user experience, reducing indoor load, and saving energy.
[0006] This application provides a multi-split fresh air system configured for use in multiple rooms, including:
[0007] Multiple indoor units are configured to be installed in multiple rooms for temperature regulation of the air in each room;
[0008] The outdoor unit is configured to connect to each indoor unit via refrigerant piping.
[0009] The fresh air unit is connected to the communication bus between the outdoor unit and multiple indoor units. Through the communication bus, the fresh air unit can know the set temperature and set humidity of the indoor units when they are turned on.
[0010] The fresh air unit includes:
[0011] The housing is provided with a fresh air inlet and a fresh air outlet.
[0012] The fresh air fan is located inside the housing. Its operation draws in outdoor air through the fresh air inlet and outputs fresh air through the fresh air outlet.
[0013] A total heat exchange core is located inside the housing and between the fresh air inlet and the fresh air outlet, and is used to exchange energy with the airflow passing through it.
[0014] A heat exchanger is located inside the housing and connected to the outdoor unit via refrigerant piping. The temperature of the fresh air flowing through it is regulated by the operation of the fresh air fan.
[0015] An outdoor fresh air duct, located on one side of the fresh air unit, introduces outdoor fresh air to adjust the temperature and humidity of the fresh air entering each room.
[0016] The mixing section, located on one side of the fresh air unit, is used to mix the airflow output from the fresh air outlet with the outdoor fresh air introduced into the outdoor fresh air duct.
[0017] The control unit is configured as follows:
[0018] In the first mode of cooling the air in at least one room, based on the set temperature or set humidity of each indoor unit when it is turned on, the outdoor fresh air and the fresh air output from the fresh air unit are processed in the mixing section to make the temperature of the air entering each room equal to the set temperature or humidity of each room.
[0019] In the second mode of heating the air in at least one room, based on the set temperature of each indoor unit when it is turned on, the outdoor fresh air and the fresh air output from the fresh air unit are processed in the mixing section to make the temperature of the air entering each room equal to the set temperature of each room.
[0020] The multi-split fresh air system provided in this application has a fresh air unit that is similar to an indoor unit, and can communicate with the outdoor unit and connect to the heat exchanger in the fresh air unit through refrigerant piping.
[0021] In this way, while the outdoor unit is working, the indoor unit can also operate, and the fresh air unit can introduce fresh hot or cold air. Since the fresh air unit can obtain the set temperature / humidity of the indoor unit, the mixing unit mixes the fresh air output from the fresh air outlet with the outdoor fresh air and introduces the mixed air into the room. This ensures that the temperature or humidity of the fresh air entering the room is equal to the set temperature or humidity of the room, reducing the impact of fresh air introduction on the indoor temperature / humidity load, saving energy, and avoiding large fluctuations in indoor temperature / humidity, thus improving the user experience.
[0022] In some embodiments of this application, in the first mode of cooling the air in the room, the fresh air is also dehumidified at the same time.
[0023] In the first mode, based on the minimum set humidity or the minimum set humidity among the set humidity values of each indoor unit when it is powered on, the fresh air temperature of the fresh air output from the fresh air unit is controlled to be equal to the minimum set temperature or the fresh air humidity is equal to the minimum set humidity. Furthermore, by processing the outdoor fresh air and the fresh air output from the fresh air unit in the mixing section, the temperature of the air entering each room is equal to the set temperature or the humidity of the air entering each room is equal to the set humidity of each room.
[0024] Thus, in the first mode, based on the selected adjustment of humidity or temperature, the fresh air temperature or humidity at the fresh air outlet is controlled accordingly, so that the airflow entering the room does not cause fluctuations in the airflow in the room.
[0025] In the second mode, based on the maximum set temperature among the set temperatures of each indoor unit that is turned on, the fresh air temperature at the fresh air outlet of the fresh air unit is controlled to be equal to the maximum set temperature. The outdoor fresh air and the fresh air flow output by the fresh air unit are processed in the mixing section to make the temperature of the airflow entering each room equal to the set temperature of each room.
[0026] Thus, in the second mode, based on the selected temperature adjustment, the fresh air temperature at the fresh air outlet is controlled accordingly, so that the airflow entering the room does not cause fluctuations in the airflow within the room.
[0027] In some embodiments of this application, in order to enable the fresh air unit to supply fresh air to multiple rooms, the mixing section includes:
[0028] Multiple air mixing channels, the number of which is equal to the number of indoor units in the power-on state, each air mixing channel is used to mix the fresh air output from the fresh air outlet with the outdoor fresh air introduced by the outdoor fresh air channel.
[0029] In some embodiments of this application, the air mixing passage has three interconnected vents, the three vents including a first vent, a second vent, and a third vent;
[0030] A first airflow regulating element is provided at the first ventilation opening to adjust the flow rate of the fresh air output from the fresh air outlet;
[0031] A second airflow regulating element is provided at the second ventilation opening to adjust the flow rate of outdoor fresh air introduced from the outdoor fresh air duct;
[0032] The fresh air flow rate and the outdoor fresh air volume are mixed and then delivered to the room to which the corresponding indoor unit belongs through the third ventilation opening.
[0033] Specifically, in summer cooling mode, you can choose to control the fresh air temperature or the fresh air humidity, depending on your needs.
[0034] In some embodiments of this application, the multi-split fresh air system further includes:
[0035] An additional outdoor heat exchanger is connected to the outdoor unit via a throttling device and is located within the air supply duct of the fresh air unit. The additional outdoor heat exchanger is located on the side of the heat exchanger away from the total heat exchange core and is used to preheat the cold airflow that has passed through the total heat exchange core of the fresh air unit after dehumidifying the indoor air.
[0036] Depending on the needs, during transitional seasons when cooling is not required and humidity is high, the multi-split fresh air system operates in cooling mode, meaning that the indoor unit is cooled and cold air is also blown out after passing through the heat exchanger in the fresh air unit. In order to avoid the cold air causing discomfort to users, the cold air blown out by the heat exchanger is preheated by an additional outdoor heat exchanger to reduce the uncomfortable feeling of cold.
[0037] In some embodiments of this application, the control unit is configured to adjust the opening of the throttling device to adjust the refrigerant flow rate through the additional outdoor heat exchanger.
[0038] In some embodiments of this application, the multi-split fresh air system further includes:
[0039] The air purification unit is installed in the fresh air duct of the fresh air unit and is close to the fresh air inlet of the fresh air unit.
[0040] The fresh air system first purifies the outdoor fresh air before introducing it into the system and then into the room.
[0041] In some embodiments of this application, the air purification unit includes:
[0042] Ultraviolet germicidal lamps are used to irradiate the fresh air duct of the fresh air unit with ultraviolet light; and / or
[0043] A coarse filter is disposed near the fresh air inlet; and / or
[0044] Negative ion generator; and / or
[0045] Micro-electrostatic module.
[0046] By employing different types of air purification units and their combinations, the quality of fresh air introduced into the room can be ensured. Attached Figure Description
[0047] Figure 1 An architectural diagram of a multi-split fresh air system according to some embodiments is shown;
[0048] Figure 2A structural diagram of a multi-split fresh air system according to some embodiments is shown.
[0049] Figure 3 A schematic diagram of a temperature-controlled fresh air unit in a multi-split fresh air system according to some embodiments is shown;
[0050] Figure 4 A structural diagram of the distribution unit of the fresh air unit in a multi-split fresh air system according to some embodiments is shown when the fresh air unit is controlled based on temperature in summer.
[0051] Figure 5 A structural diagram of the distribution unit of the fresh air unit in a multi-split fresh air system during summer humidity control is shown according to some embodiments;
[0052] Figure 6 A structural diagram of the distribution unit of the fresh air unit in a multi-split fresh air system during winter temperature-controlled operation is shown according to some embodiments.
[0053] Figure 7 Another structural diagram of a multi-split fresh air system according to some embodiments is shown;
[0054] Figure 8 A schematic diagram illustrating the principle of preheating after dehumidification in a multi-split fresh air system according to some embodiments is shown.
[0055] Figure 9 A structural diagram of the fresh air unit in a multi-split fresh air system according to some embodiments is shown. Detailed Implementation
[0056] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0057] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0058] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.
[0059] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0060] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0061] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.
[0062] [Multi-split fresh air system]
[0063] See Figure 1 The multi-split fresh air system includes an outdoor unit 100, multiple indoor units (only indoor unit 300 is marked), a fresh air unit 200, an outdoor fresh air duct, and a mixing section.
[0064] Multiple indoor units are configured to be located in multiple rooms, that is, one indoor unit is set in each room for regulating the temperature of the air in the room (cooling or heating).
[0065] To improve indoor air quality, the introduced fresh air unit 200 is configured to be shared by multiple rooms. That is, the fresh air outlet SA of the fresh air unit 200 is branched into several air supply branches, and the number of air supply branches is the same as the number of rooms.
[0066] The fresh air unit 200 includes a heat exchanger 280 located within the air supply duct 230, as described below.
[0067] The fresh air unit 200 and multiple indoor units 300 communicate with the outdoor unit 100, and the heat exchanger 280 in the fresh air unit 200 and multiple indoor units 300 are connected to the outdoor unit 100 through refrigerant piping.
[0068] That is, the heat exchanger 280 in the fresh air unit 200 is equivalent to an indoor unit.
[0069] When the outdoor unit 100 is cooling, the heat exchanger 280 in the fresh air unit 200 is used as an evaporator; when the outdoor unit 100 is heating, the heat exchanger 280 in the fresh air unit 200 is used as a condenser.
[0070] The working principle of the air conditioning unit formed by the outdoor unit 100 and multiple indoor units 300 is described below.
[0071] Air conditioning units execute a cooling and heating cycle using a compressor, condenser, expansion valve, and evaporator. The cooling and heating cycle involves a series of processes—compression, condensation, expansion, and evaporation—to cool or heat an indoor space.
[0072] Low-temperature, low-pressure refrigerant enters the compressor, which compresses it into a high-temperature, high-pressure refrigerant gas and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
[0073] The expansion valve expands the high-temperature, high-pressure liquid refrigerant that condenses in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves its cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the air conditioning unit regulates the temperature of the indoor space.
[0074] The outdoor unit of an air conditioning unit refers to the part of the refrigeration cycle that includes the compressor, outdoor heat exchanger, and outdoor fan. The indoor unit of an air conditioning unit includes the indoor heat exchanger and indoor fan, and throttling devices (such as capillary tubes or electronic expansion valves) can be provided in either the indoor or outdoor unit.
[0075] The indoor and outdoor heat exchangers function as either condensers or evaporators. When the indoor heat exchanger is used as a condenser, the air conditioning unit operates in heating mode; when it is used as an evaporator, the air conditioning unit operates in cooling mode.
[0076] The indoor and outdoor heat exchangers are converted into condensers or evaporators, which is generally done using a four-way valve. For details, please refer to the settings of conventional air conditioning units, which will not be elaborated here.
[0077] The working principle of an air conditioning unit is as follows: the compressor operates to bring the indoor heat exchanger (which acts as the evaporator in the indoor unit) to an ultra-low pressure. The liquid refrigerant in the indoor heat exchanger rapidly evaporates and absorbs heat. The air blown out by the indoor fan is cooled by the indoor heat exchanger coil and then blown into the room as cold air. The vaporized refrigerant is then pressurized by the compressor and condenses into a liquid state in the high-pressure environment of the outdoor heat exchanger (which acts as the condenser in the outdoor unit), releasing heat. This heat is then dissipated into the atmosphere by the outdoor fan. This cycle achieves the cooling effect.
[0078] The heating principle of an air conditioning unit is as follows: Gaseous refrigerant is pressurized by the compressor, becoming a high-temperature, high-pressure gas. This gas enters the indoor heat exchanger (which acts as a condenser), where it condenses and liquefies, releasing heat and becoming a liquid. Simultaneously, it heats the indoor air, thus raising the indoor temperature. The liquid refrigerant is then depressurized by a throttling device and enters the outdoor heat exchanger (which acts as an evaporator). There, it evaporates and absorbs heat, becoming a gas again. Simultaneously, it absorbs heat from the outdoor air (making the outdoor air cooler), becoming a gaseous refrigerant once more, and then re-enters the compressor to begin the next cycle.
[0079] When the air conditioning unit is used as a heater in heating mode, the heat exchanger 280 in the fresh air unit 200 is used as a condenser to introduce hot fresh air and assist the air conditioning unit in heating; when the air conditioning unit is used as a cooler in cooling mode, the heat exchanger 280 in the fresh air unit 200 is used as an evaporator to introduce cold fresh air and assist the air conditioning unit in cooling.
[0080] The fresh air unit 200 involved in this application has fresh air (with heat recovery) function, temperature regulation function and humidity regulation function.
[0081] The fresh air function is used to regulate indoor air quality, the temperature regulation function is used to regulate the temperature of indoor air (i.e., regulate the temperature of the fresh air entering the room), and the humidity regulation function is used to regulate the humidity of indoor air (i.e., regulate the humidity of the fresh air entering the room).
[0082] The humidity regulation function of the fresh air unit 200 mentioned above refers to the dehumidification regulation function performed by the heat exchanger 280 in the air supply duct 230 during cooling.
[0083] Heat exchanger 280 dehumidifies outdoor air by condensing and cooling it.
[0084] See Figure 2 The fresh air unit 200 includes a housing (not shown), a total heat exchange core 210, and a heat exchanger 280.
[0085] As described above, the heat exchanger 280 participates in the refrigeration cycle of the outdoor unit 100, and it is connected to the outdoor heat exchanger (not shown) in the outdoor unit 100 via an electronic expansion valve 280'.
[0086] The fresh air unit 200 includes an exhaust vent EA, an exhaust fan 270, a housing, a total heat exchange core 210, a return air vent RA, a fresh air inlet OA, a fresh air outlet SA, and a fresh air fan 260.
[0087] The housing is equipped with an exhaust vent EA, a return air vent RA, a fresh air outlet SA, and a fresh air inlet OA.
[0088] An exhaust fan 270 is installed at the exhaust vent EA, and a fresh air fan 260 is installed at the fresh air outlet SA.
[0089] The total heat exchange core 210 is located inside the housing, and the space inside the housing is divided into four channels that are all connected to the total heat exchange core 210.
[0090] The four channels include a fresh air channel 220, a supply air channel 230, a return air channel 240, and an exhaust air channel 250.
[0091] The fresh air duct 220 is a passageway from the fresh air inlet OA to one side of the total heat exchange core 210.
[0092] The air supply duct 230 is the passage from one side of the total heat exchange core 210 to the fresh air outlet SA.
[0093] The return air duct 240 is a passage from the return air outlet RA to one side of the total heat exchange core 210.
[0094] The exhaust duct 250 is a passage from one side of the total heat exchange core 210 to the exhaust vent EA.
[0095] When the fresh air unit 200 is exchanging heat, the return air from the return air vent RA and the fresh air from the fresh air inlet OA exchange heat through the total heat exchange core 210.
[0096] When cooling, the outdoor unit 100 is used as a condenser, and the indoor unit 300 and heat exchanger 280 are used as evaporators; when heating, the outdoor unit 100 is used as an evaporator, and the indoor unit 300 and heat exchanger 280 are used as condensers.
[0097] The fresh air unit 200 and the indoor unit 300 are connected to the communication bus, so that the fresh air unit 200 can know the set temperature and set humidity of the indoor unit when it is turned on (e.g., set via a wired controller).
[0098] In order to avoid the introduction of fresh air from interfering with indoor airflow and causing discomfort to users, in some embodiments of this application, the temperature and humidity of the fresh air entering the room are controlled to reduce the fluctuation of the introduced fresh air on the indoor load.
[0099] Since the fresh air unit 200 can know the set temperature of the indoor unit 300, the fresh air unit 200 can, based on that set temperature (see, for example, [reference needed]), [further details needed]. Figure 3 The room temperature is set at a), and the amount of refrigerant entering the heat exchanger 280 is controlled to ensure that the temperature of the fresh air output from the fresh air outlet SA of the fresh air unit 200 after being processed by the heat exchanger 280 is maintained at the set temperature a, thereby reducing the impact of the introduction of fresh air on the room temperature.
[0100] In some embodiments of this application, the fresh air unit 200 provides fresh air to at least two rooms while avoiding the impact on the load in each room when providing fresh air to multiple rooms.
[0101] In some embodiments of this application, the example of a fresh air unit 200 providing fresh air to three rooms (referred to as room A, room B, and room C) is used for illustration.
[0102] Therefore, the set temperature of one room should not be considered alone; the set temperatures of all three rooms should be taken into account.
[0103] [Mode 1]
[0104] As mentioned above, three indoor units will be set up for each of the three rooms to regulate the indoor air in each room.
[0105] In some embodiments of this application, for example, when the outdoor ambient temperature is high in summer, it is necessary to cool and regulate the air in the room. At this time, it is necessary to enter the cooling mode, that is, the air conditioning unit formed by the indoor unit 300 and the outdoor unit 100 performs a cooling cycle.
[0106] At this time, the indoor unit 300 is used as an evaporator.
[0107] Since the heat exchanger 280 in the fresh air unit 200 is connected to the outdoor unit 100 through refrigerant piping, the heat exchanger 280 in the air supply duct 230 also functions as an evaporator to cool the fresh air introduced into the air supply duct 230.
[0108] Therefore, the first mode involved in this application is the cooling mode.
[0109] When the fresh air unit 200 supplies cool air to multiple rooms, an outdoor fresh air duct is also installed to ensure that the impact on the indoor load is reduced. It is located on one side of the fresh air unit 200 and outdoor fresh air is introduced through the outdoor fresh air duct to adjust the temperature and humidity of the fresh air entering each room.
[0110] In addition, the multi-split fresh air system is also configured to have a mixing section, which is located on one side of the fresh air unit and can be located between the fresh air unit and multiple indoor units, for mixing the airflow output from the fresh air outlet SA of the fresh air unit 200 with the outdoor fresh air introduced through the outdoor fresh air duct.
[0111] The control unit in the multi-split fresh air system is configured as follows.
[0112] In the first mode of cooling the air in at least one room, based on the set temperature or set humidity of each indoor unit when it is turned on, the outdoor fresh air introduced through the outdoor fresh air duct and the fresh air output at the fresh air outlet SA of the fresh air unit 200 are processed in the mixing unit. For example, the flow rate of the fresh air to be introduced into each room and the flow rate of the outdoor fresh air are adjusted so that the temperature of the air entering each room is equal to the set temperature of the room, or the humidity of the air entering each room is equal to the set humidity of the room.
[0113] In summer, the system also dehumidifies while cooling. For the Fresh Air Unit 200, the heat exchanger 280 is used for both cooling and dehumidification. How to ensure that the temperature and humidity of the introduced fresh air do not affect the indoor load is a problem that needs to be considered.
[0114] It is difficult to balance temperature and humidity control when cooling in the summer.
[0115] Therefore, in some embodiments of this application, temperature-based control or humidity-based control can be selected based on condition judgment, or the priority of humidity-based control can be set higher than that of temperature-based control during summer cooling.
[0116] The following example illustrates the process of temperature-based or humidity-based control based on conditional judgment.
[0117] [Temperature-based control 1]
[0118] Temperature-based control refers to controlling the fresh air temperature at the fresh air outlet SA of the fresh air unit 200 to be equal to the minimum set temperature among the set temperatures of each indoor unit when it is turned on. Furthermore, the outdoor fresh air introduced through the outdoor fresh air duct and the fresh air output from the fresh air outlet SA of the fresh air unit 200 are processed in the mixing section. For example, the flow rate of the fresh air in each room of the indoor unit to be introduced and the flow rate of the outdoor fresh air are adjusted so that the temperature of the air entering each room is equal to the set temperature of each room.
[0119] Temperature-based control to control the supply air temperature T 231' To achieve the target, the supply air temperature T 231' It is equal to or within the first indoor preset temperature Tset.
[0120] The first indoor preset temperature Tset or the first indoor preset temperature range is the minimum set temperature in each room supplied with fresh air by the fresh air unit 200.
[0121] Among them, the supply air temperature T 231' The temperature and humidity can be detected by the temperature and humidity sensor 231' located at the fresh air outlet SA.
[0122] In temperature-based control, the refrigerant flow path is described below.
[0123] See Figure 2 The outdoor unit 100 discharges liquid refrigerant, which then passes through the first throttling device 280' and piping, enters the heat exchanger 280 to evaporate and absorb heat, turning into a gaseous state. The refrigerant from the heat exchanger 280 passes through piping and is then compressed by the compressor in the outdoor unit 100, completing the refrigeration cycle.
[0124] In this cycle, heat exchanger 280 is used as an evaporator.
[0125] Meanwhile, the indoor unit 300 also functions as an evaporator.
[0126] See Figure 2 When fresh air is introduced, outdoor fresh air enters the total heat exchange core 210 through the fresh air inlet OA, exchanges heat with indoor return air in the total heat exchange core 210, and then is cooled down by the heat exchanger 280. Finally, it is sent out from the fresh air outlet SA by the fresh air fan 260 and enters the room, completing the process of introducing cold fresh air.
[0127] In order to achieve the supply air temperature T 231' In this mode, the airflow speed (i.e., the speed setting) of the fresh air fan 260 is controlled to reach the first indoor preset temperature Tset or within the first indoor preset temperature range relatively quickly.
[0128] As described above, in some embodiments of this application, the fresh air unit 200 supplies fresh air to multiple rooms.
[0129] For this reason, see Figure 4 The mixing section includes multiple mixing passages, the number of which is equal to the number of indoor units in the power-on state. Each mixing passage is used to mix the outdoor fresh air introduced through the outdoor fresh air duct and the fresh air output from the fresh air outlet SA of the fresh air unit 200.
[0130] The mixing section also includes a processing unit.
[0131] The processing unit processes the data based on the set temperature of each indoor unit when it is powered on, the fresh air temperature of the fresh air outlet SA of the fresh air unit 200, and the outdoor fresh air temperature, in order to obtain the flow rate of the outdoor fresh air to be introduced into each room from the outdoor fresh air channel and the flow rate of the fresh air to be introduced into each room from the fresh air outlet SA of the fresh air unit 200.
[0132] Furthermore, the adjusted outdoor fresh air and fresh air flow are mixed in the mixing channel of the corresponding room and then introduced into the room, so that the temperature of the airflow entering each room is equal to the set temperature of each room.
[0133] In some embodiments of this application, as described above, the fresh air unit 200 provides fresh air to three rooms A / B / C.
[0134] See Figure 4 The mixing air passage has three interconnected vents, namely a first vent, a second vent, and a third vent.
[0135] A first airflow regulating element (e.g., an airflow valve) can be installed at the first vent to adjust the flow rate of the fresh air introduced into the mixing passage from the fresh air outlet SA.
[0136] A second airflow regulating element can be installed at the second vent to adjust the flow rate of outdoor fresh air introduced into the mixing air passage from the outdoor fresh air duct.
[0137] The third ventilation opening connects to the room.
[0138] The fresh air flow output from the first vent is mixed with the outdoor air flow output from the second vent, and then introduced into the room through the third vent. At this time, the temperature of the air flow entering the room is equal to the set temperature of the room.
[0139] Suppose that the set temperatures of rooms A, B, and C are a, b, and c, respectively, where a > b > c, and that the air conditioning units in all three rooms are turned on.
[0140] For the three rooms mentioned above, three mixing air passages should be provided.
[0141] The control unit obtains the minimum set temperature, c, of the set temperatures of the three rooms, and uses it as the set temperature of the fresh air unit 200.
[0142] Let the outdoor fresh air temperature be x.
[0143] Because in the high-temperature environment of summer, the outdoor fresh air temperature x is higher than the maximum set temperature a in the room.
[0144] Based on the minimum set temperature c, the fresh air unit 200 controls the process of introducing cold air so that the fresh air temperature at the fresh air outlet SA is equal to c.
[0145] The mixing unit processes the set temperatures a / b / c of rooms A / B / C, as well as the fresh air temperature C and outdoor fresh air temperature x output from the fresh air outlet SA, to obtain the flow rate of the fresh air to be introduced and the flow rate of the outdoor fresh air in each mixing channel.
[0146] Next, adjust the airflow regulating element on the corresponding mixing air passage.
[0147] For room A, in the first mixing air passage, by controlling the opening of the first air volume regulating element sw2, a flow rate Q1 of fresh air with a temperature of c is introduced, and by controlling the opening of the second air volume regulating element sw1, a flow rate Q2 of outdoor fresh air with a temperature of x is introduced, so that the fresh air temperature of the mixed air flow at the third vent of the mixing air passage is a, and then it is output to room A.
[0148] As a result, no temperature fluctuations occurred in room A.
[0149] For room B, in the second mixing air passage, by controlling the opening of the first air volume regulating element sw4, a flow rate Q1' of fresh air with a temperature of c is introduced, and by controlling the opening of the second air volume regulating element sw3, a flow rate Q2' of outdoor fresh air with a temperature of x is introduced, so that the temperature of the fresh air at the third vent of the mixing air passage is b, and thus it is output to room B.
[0150] Thus, no temperature fluctuation occurred in room B. For room C, in the third air mixing path, by controlling the opening of the first air volume regulating element sw6 to be fully open and the opening of the second air volume regulating element sw5 to be zero, fresh air with a temperature of c is directly introduced and then output to room C.
[0151] As a result, no temperature fluctuations occurred in room C.
[0152] In this way, when implementing temperature-based cooling control in summer, the temperature of the fresh air introduced into each room is equal to the set temperature in each room, reducing the impact on the indoor load and thus reducing the load on the air conditioning unit.
[0153] Humidity-based control
[0154] Humidity-based control refers to controlling the humidity of the fresh air at the fresh air outlet SA of the fresh air unit 200 to equal the minimum set humidity among the set humidity values of each indoor unit when it is powered on. Furthermore, the fresh air introduced through the outdoor fresh air duct and the fresh air output from the fresh air outlet SA of the fresh air unit 200 are processed in the mixing section. For example, the flow rate of the fresh air in each room of the indoor unit to be introduced and the flow rate of the outdoor fresh air are adjusted to make the humidity of the air entering each room equal to the set humidity of each room.
[0155] Based on humidity control, with the goal of controlling the supply air humidity Φ231', the supply air humidity Φ231' is equal to or within the first indoor preset humidity Φset'.
[0156] The first indoor preset humidity Φset' or the first indoor preset humidity range is the minimum set humidity in each room where fresh air is supplied by the fresh air unit 200.
[0157] The supply air humidity Φ231' can be detected by the temperature and humidity sensor 231' installed at the fresh air outlet SA.
[0158] As mentioned above, dehumidification is achieved through condensation while refrigerating. Therefore, the refrigerant flow path is the same as described above in humidity-based control.
[0159] The processing unit of the mixed air section processes the data based on the set humidity of each indoor unit when it is turned on, the fresh air humidity of the fresh air airflow output from the fresh air outlet SA of the fresh air unit 200, and the outdoor fresh air humidity, in order to obtain the flow rate of the outdoor fresh air to be introduced into each room from the outdoor fresh air channel and the flow rate of the fresh air airflow to be introduced into each room from the fresh air outlet SA of the fresh air unit 200.
[0160] Furthermore, the adjusted outdoor fresh air and fresh air flow are mixed in the mixing channel of the corresponding room and then introduced into the room, so that the humidity of the airflow entering each room is equal to the set humidity of each room.
[0161] See Figure 5 Assume that the set humidity for rooms A, B, and C is r1, r2, and r3, respectively, and r1 > r2 > r3, and that the air conditioning units in all three rooms are turned on.
[0162] The control unit obtains the minimum set humidity of the three rooms, i.e., r3, as the set humidity of the fresh air unit 200.
[0163] Assume the outdoor fresh air humidity is r.
[0164] For the three rooms mentioned above, three mixing air passages should be provided.
[0165] Due to the high outdoor humidity in the summer, the outdoor fresh air humidity r is higher than the maximum set humidity r1 in the room.
[0166] Based on the minimum set temperature r3, the fresh air unit 200 controls the dehumidification process so that the fresh air humidity at the fresh air outlet SA is equal to r3.
[0167] The mixing unit processes the set humidity r1 / r2 / r3 of rooms A / B / C, as well as the fresh air humidity r3 output at the fresh air outlet SA and the outdoor fresh air humidity r, to obtain the flow rate of the fresh air to be introduced in each mixing channel and the flow rate of the outdoor fresh air.
[0168] Next, adjust the airflow regulating element on the corresponding mixing air passage.
[0169] For room A, in the first mixing air passage, by controlling the opening of the first air volume regulating element sw2, a fresh air flow rate H1 with a fresh air humidity of r3 is introduced, and by controlling the opening of the second air volume regulating element sw1, an outdoor fresh air flow rate H2 with a fresh air humidity of r is introduced, so that the fresh air humidity of the mixed air flow at the third vent of the mixing air passage is r1, and then it is output to room A.
[0170] Thus, no humidity fluctuations occurred in room A.
[0171] For room B, in the second mixing air passage, by controlling the opening of the first air volume regulating element sw4, a fresh air flow rate H1' with a fresh air humidity of r3 is introduced, and by controlling the opening of the second air volume regulating element sw3, an outdoor fresh air flow rate H2' with a fresh air humidity of r is introduced, so that the fresh air humidity of the mixed fresh air flow at the third vent of the mixing passage is r2, and then it is output to room B.
[0172] Thus, no humidity fluctuation occurs in room B. For room C, on the third air mixing path, by controlling the first air volume regulating element sw6 to be fully open and the second air volume regulating element sw5 to be zero, fresh air with a humidity of r3 is directly introduced and then output to room C.
[0173] Thus, no humidity fluctuations occurred in room C.
[0174] In this way, when implementing humidity-based cooling control in summer, the humidity of the fresh air introduced into each room is equal to the set humidity in each room, reducing the impact on the indoor load and thus reducing the load on the air conditioning unit.
[0175] During humidity-based control, the temperature may drop significantly during the cooling and dehumidification process of the fresh air unit 200. That is, although dehumidification is controlled in the room, the temperature of the fresh air blown out by the fresh air unit 200 is relatively low, causing discomfort to the user.
[0176] Therefore, to avoid discomfort caused to users by the cold fresh air being blown out, see [reference needed]. Figure 7 An additional outdoor heat exchanger 110 is provided within the air supply duct 230 and downstream of the heat exchanger 280.
[0177] "Downstream" refers to the side of heat exchanger 280 that is away from the total heat exchange core 210.
[0178] The additional outdoor heat exchanger 110 is connected to the outdoor heat exchanger in the outdoor unit 100 via a second throttling device 120 (e.g., an electronic expansion valve).
[0179] During summer cooling, both the outdoor heat exchanger in outdoor unit 100 and the auxiliary outdoor heat exchanger 110 are used as condensers.
[0180] In humidity-based control, the refrigerant flow path is described below.
[0181] The outdoor unit 100 discharges liquid refrigerant, which then passes through the second throttling device 120 and piping into the auxiliary outdoor heat exchanger 110. At the same time, the liquid refrigerant discharged from the outdoor unit 100 also enters the first throttling device 280' and piping, and then enters the heat exchanger 280 to evaporate and absorb heat, turning into a gaseous state. The refrigerant from the heat exchanger 280 passes through piping and is then compressed by the compressor drawn into the outdoor unit 100, completing the refrigeration cycle.
[0182] In this cycle, the additional outdoor heat exchanger 110 is used as a condenser, and the heat exchanger 280 is used as an evaporator.
[0183] When fresh air is introduced, the outdoor fresh air enters the total heat exchange core 210 through the fresh air inlet OA. It exchanges heat with the indoor return air in the total heat exchange core 210, and then passes through the heat exchanger 280 for cooling, thus completing the dehumidification and cooling process of the fresh air unit.
[0184] Afterwards, the cold air is preheated by the additional outdoor heat exchanger 110 to increase the temperature of the cold air. Finally, it is sent out from the fresh air outlet SA by the fresh air fan 260 and enters the room. This process takes into account both the dehumidification and temperature of the fresh air to ensure user comfort.
[0185] Therefore, while cooling and dehumidifying, the temperature of the fresh air can be appropriately increased, thus improving the user experience.
[0186] The control process described above is applicable to transitional seasons where temperature requirements are not stringent but dehumidification requirements are stringent.
[0187] For example, see Figure 8 The following example illustrates how a fresh air system 200 controls dehumidification based on a set humidity r', so that the fresh air humidity at the fresh air outlet SA is equal to r'.
[0188] (1) Outdoor fresh air with humidity r is introduced into the total heat exchange core 210 through the fresh air inlet OA.
[0189] (2) The fresh air unit 200 receives the preset humidity r' and controls the cooling and dehumidification.
[0190] (3) Obtain the humidity of the fresh air at the fresh air outlet SA as r'.
[0191] (4) An additional outdoor heat exchanger 110 preheats the cold air with a fresh air humidity of r' to increase the temperature of the cold air.
[0192] (5) Output comfortable airflow at the fresh air outlet SA.
[0193] In some embodiments of this application, the opening of the second throttling device 120 (e.g., an electronic expansion valve) can be adjusted based on the difference between the temperature T1 of the cold air after heat exchanger 280 and the set temperature T2 of the fresh air unit 200 (i.e., the set temperature in the room), so as to adjust the refrigerant flow rate through the additional outdoor heat exchanger 110, thereby increasing the level of preheated cold air and making the fresh air temperature T at the fresh air outlet SA of the fresh air unit 200 equal to the set temperature T2.
[0194] The control of a multi-split air conditioning system in summer cooling mode has been described above. The control of a multi-split air conditioning system in winter heating mode will be described below.
[0195] [Second Mode]
[0196] In some embodiments of this application, for example, when the outdoor ambient temperature is low in winter and it is necessary to heat the air in the room, it is necessary to enter the heating mode, that is, the air conditioning unit formed by the indoor unit 300 and the outdoor unit 100 performs heating circulation.
[0197] At this time, the indoor unit 300 is used as a condenser.
[0198] Since the heat exchanger 280 in the fresh air unit 200 is connected to the outdoor unit 100 through refrigerant piping, the heat exchanger 280 in the air supply duct 230 also functions as a condenser to heat the fresh air introduced into the air supply duct 230.
[0199] Therefore, the second mode involved in this application is the heating mode.
[0200] When heating in winter, only temperature control is considered.
[0201] Therefore, when selecting temperature-based control, based on the maximum set temperature among the set temperatures of each indoor unit in the power-on state, the fresh air temperature of the fresh air flow at the fresh air outlet SA of the fresh air unit 200 is controlled to be equal to the maximum set temperature. Furthermore, by processing the outdoor fresh air introduced through the outdoor fresh air duct and the fresh air flow output by the fresh air unit 200 at the fresh air outlet SA in the mixing section, for example, adjusting the flow rate of the fresh air flow in each room of the indoor unit to be introduced in the power-on state and the flow rate of the outdoor fresh air, the temperature of the airflow entering each room is made equal to the set temperature of each room.
[0202] It should be noted that in temperature-based control, the flow path of refrigerant into the auxiliary outdoor heat exchanger 110 in the outdoor unit 100 is closed by shutting off the second throttling device 120. At this time, the auxiliary outdoor heat exchanger 110 does not function.
[0203] [Temperature-Based Control 2]
[0204] Temperature-based control to control the supply air temperature T 231' To achieve the target, the supply air temperature T 231' It is equal to or within the range of the second indoor preset temperature Tset'.
[0205] The second indoor preset temperature Tset' or the second indoor preset temperature range is the maximum set temperature in each room supplied with fresh air by the fresh air unit 200.
[0206] Among them, the supply air temperature T 231' The temperature and humidity can be detected by the temperature and humidity sensor 231' located at the fresh air outlet SA.
[0207] In temperature-based control, the refrigerant flow path is described below.
[0208] The outdoor unit 100 discharges liquid refrigerant into the heat exchanger 280. After heat exchange inside the heat exchanger 280, the refrigerant condenses and releases heat, becoming liquid refrigerant. Then, the refrigerant passes through the first throttling device 280' to a low-temperature, low-pressure gas-liquid dual state. It then enters the outdoor unit 100 to evaporate and absorb heat, becoming gaseous. Finally, it is drawn into the outdoor unit 100 and compressed by the compressor to complete the heating cycle.
[0209] In this cycle, heat exchanger 280 is used as a condenser.
[0210] Meanwhile, the indoor unit 300 also functions as a condenser.
[0211] See Figure 2 When introducing fresh air, outdoor fresh air enters the total heat exchange core 210 through the fresh air inlet OA, exchanges heat with indoor return air in the total heat exchange core 210, is heated by the heat exchanger 280, and is finally sent out from the fresh air outlet SA by the fresh air fan 260 into the room, completing the process of introducing hot fresh air.
[0212] In order to achieve the supply air temperature T 231' In this mode, the airflow speed (i.e., the speed setting) of the fresh air fan 260 is controlled to reach the second indoor preset temperature Tset' or within the second indoor preset temperature range relatively quickly.
[0213] As mentioned above, a multi-split fresh air system includes a mixing section.
[0214] The processing unit of the mixed air section processes the data based on the set temperature of each indoor unit when it is turned on, the fresh air temperature of the fresh air output from the fresh air outlet SA of the fresh air unit 200, and the outdoor fresh air temperature, in order to obtain the flow rate of the outdoor fresh air to be introduced into each room from the outdoor fresh air channel and the flow rate of the fresh air output from the fresh air outlet SA of the fresh air unit 200 to be introduced into each room.
[0215] Furthermore, the adjusted outdoor fresh air and fresh air flow are mixed in the mixing channel of the corresponding room and then introduced into the room, so that the temperature of the airflow entering each room is equal to the set temperature of each room.
[0216] See Figure 6 Suppose that the set temperatures of rooms A, B, and C are a', b', and c', respectively, and a' > b' > c', and that the air conditioning units in all three rooms are turned on.
[0217] For the three rooms mentioned above, three mixing air passages should be provided.
[0218] The control unit obtains the maximum set temperature of the three rooms, i.e., a', as the set temperature of the fresh air unit 200.
[0219] Assume the outdoor fresh air temperature is x'.
[0220] Because in the low-temperature environment of winter, the outdoor fresh air temperature x' is lower than the minimum set temperature c' in the room.
[0221] Based on the maximum set temperature a, the fresh air unit 200 controls the process of introducing hot air so that the fresh air temperature at the fresh air outlet SA is equal to a'.
[0222] The mixing unit processes the set temperatures a' / b' / c' of rooms A / B / C, as well as the fresh air temperature a' and outdoor fresh air temperature x' output from the fresh air outlet SA, to obtain the flow rate of the fresh air to be introduced and the flow rate of the outdoor fresh air in each mixing channel.
[0223] Next, adjust the airflow regulating element on the corresponding mixing air passage.
[0224] For room A, in the first air mixing path, by controlling the opening of the first air volume regulating element sw2 to be fully open and the opening of the second air volume regulating element sw1 to be zero, a fresh air flow with a temperature of a' is introduced and then output to room A.
[0225] As a result, no temperature fluctuations occurred in room A.
[0226] For room B, in the second mixing air passage, by controlling the opening of the first air volume regulating element sw4, a flow rate Q11' of fresh air with a temperature of a' is introduced, and by controlling the opening of the second air volume regulating element sw3, a flow rate Q21' of outdoor fresh air with a temperature of x' is introduced, so that the fresh air temperature of the mixed fresh air at the third vent of the mixing air passage is b', and then it is output to room B.
[0227] As a result, no temperature fluctuations occurred in room B.
[0228] For room C, in the third mixing air passage, by controlling the opening of the first air volume regulating element sw6, a flow rate Q11'' of fresh air with a temperature of a' is introduced, and by controlling the opening of the second air volume regulating element sw5, a flow rate Q21'' of outdoor fresh air with a temperature of x' is introduced, so that the fresh air temperature of the mixed fresh air at the third vent of the mixing air passage is c', and then it is output to room C.
[0229] As a result, no temperature fluctuations occurred in room C.
[0230] In this way, when implementing temperature-based heating control in winter, the temperature of the fresh air introduced into each room is equal to the set temperature in each room, reducing the impact on the indoor load and thus reducing the load on the air conditioning unit.
[0231] In winter temperature-based heating control, the flow path of refrigerant into the auxiliary outdoor heat exchanger 110 in the outdoor unit 100 is closed by shutting off the second throttling device 120, at which time the auxiliary outdoor heat exchanger 110 is not in operation.
[0232] In some embodiments of this application, the multi-split fresh air system may further include an outdoor environment detection unit (not shown), which is connected to the control unit for detecting the outdoor environment.
[0233] After the fresh air unit 200 starts working, it can be controlled to shut down or keep the fresh air unit 200 running by detecting whether the outdoor environment meets the fresh air requirements.
[0234] The outdoor environment detection unit can be a sensor for detecting CO2 concentration in the outdoor environment, a sensor for detecting CO2 and PM2.5 concentration in the outdoor environment, or a sensor for detecting PM2.5 concentration in the outdoor environment, etc.
[0235] Information obtained by outdoor environmental monitoring units (such as the concentration of PM2.5 in the outdoor environment) can be used to measure the quality of the outdoor environment.
[0236] PM2.5 concentration limits can be set.
[0237] That is, when the outdoor fresh air meets the fresh air requirements (for example, the detected outdoor PM2.5 concentration is less than or equal to the PM2.5 concentration limit), it means that the outdoor air quality is relatively good and suitable for introducing outdoor fresh air. At this time, the fresh air unit 200 can be put into operation.
[0238] When the outdoor fresh air does not meet the fresh air requirements (for example, the detected outdoor PM2.5 concentration is greater than the PM2.5 concentration limit), it indicates that the outdoor air quality is poor and it is not suitable to introduce outdoor fresh air. In this case, the fresh air unit 200 will not work.
[0239] Therefore, the prerequisite for the operation of the fresh air system 200 is that the outdoor environment meets the fresh air requirements.
[0240] That is, the detected outdoor PM2.5 concentration is less than or equal to the PM2.5 concentration limit.
[0241] In some embodiments of this application, see Figure 9 In order to purify outdoor air, an air purification unit 290 is also installed.
[0242] The air purification unit 290 is installed in the fresh air duct 220 to purify the outdoor fresh air. The outdoor fresh air enters the fresh air duct 220 through the fresh air inlet OA and is purified by the air purification unit 290 before being sent into the total heat exchange core 210 and then into the air supply duct 230.
[0243] The total heat exchange core 210 is located downstream of the air purification unit 290, and the fresh air fan 260 is located downstream of the total heat exchange core 210. Therefore, the influence of pollutants in the outdoor fresh air on the total heat exchange core 210 and the fresh air fan 260 can be avoided, ensuring the operational reliability of the total heat exchange core 210 and the fresh air fan 260.
[0244] The air purification unit 290 may include one or more of the following: an ultraviolet germicidal lamp (not shown), a coarse filter (not shown), a negative ion generator (not shown), and a micro-electrostatic module (not shown).
[0245] The following explanation uses an air purification unit 290, which includes an ultraviolet germicidal lamp, a coarse filter, a negative ion generator, and a micro-electrostatic module, as an example.
[0246] The coarse filter can be installed near the fresh air inlet (OA) to perform preliminary filtration of the passing airflow.
[0247] The structure and installation location of the negative ion generator and micro-electrostatic module can be set according to requirements, and can be set independently or in combination as needed.
[0248] In some embodiments of this application, a negative ion generator and a micro-electrostatic module are assembled and installed to form an air purification unit.
[0249] The principle of a negative ion generator is to use a pulse oscillation circuit to boost a low voltage to a DC negative high voltage through a high voltage module. This negative DC high corona discharge is continuously generated at the tip of a carbon fiber electrode, which then emits a large number of electrons at high speed.
[0250] Negative air ions have the functions of removing dust, sterilizing, and purifying the air.
[0251] The micro-electrostatic module uses high-voltage electrostatics to adsorb particulate matter and inactivates bacteria and viruses under the influence of a high-voltage electric field, achieving not only air purification but also air disinfection and sterilization.
[0252] In some embodiments of this application, the air purification unit is installed on the side of the total heat exchange core 210 facing the fresh air inlet OA.
[0253] In some embodiments of this application, the negative ion generator and the micro-electrostatic module are arranged upstream and downstream along the airflow direction within the fresh air duct 220.
[0254] A preset distance needs to be maintained between the coarse filter and the negative ion generator. This distance can be set by the user and should not be too small, so as to prevent the coarse filter from adversely affecting the amount of negative ions generated by the negative ion generator.
[0255] When the air purification unit 290 is working, the negative ion generator releases electrons into the air at high speed. These electrons combine with particulate matter and bacteria in the air and become charged. Then, when passing through the high-voltage electrostatic field in the micro electrostatic module at the back end, they are subjected to the high-voltage electric field force and move in a direction, thereby adsorbing particulate matter and bacteria onto the electrodes, achieving the purification effect of dust removal and sterilization.
[0256] The ultraviolet germicidal lamp can irradiate ultraviolet light into the fresh air duct 220 for ultraviolet sterilization.
[0257] The multi-split fresh air system provided in this application can provide purified fresh air to the room while avoiding impact on the indoor load, thus improving the user experience. At the same time, it saves energy by reducing disturbance to the indoor load.
[0258] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.
[0259] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.
Claims
1. A multi-split fresh air system configured for use in multiple rooms, characterized in that, include: Multiple indoor units are configured to be installed in multiple rooms for temperature regulation of the air in each room; The outdoor unit is configured to connect to each indoor unit via refrigerant piping. The fresh air unit is connected to the communication bus between the outdoor unit and multiple indoor units. Through the communication bus, the fresh air unit can know the set temperature and set humidity of the indoor units when they are turned on. The fresh air unit includes: The housing is provided with a fresh air inlet and a fresh air outlet. The fresh air fan is located inside the housing. Its operation draws in outdoor air through the fresh air inlet and outputs fresh air through the fresh air outlet. A total heat exchange core is located inside the housing and between the fresh air inlet and the fresh air outlet, and is used to exchange energy with the airflow passing through it. A heat exchanger is located inside the housing and connected to the outdoor unit via refrigerant piping. The temperature of the fresh air flowing through it is regulated by the operation of the fresh air fan. An outdoor fresh air duct, located on one side of the fresh air unit, introduces outdoor fresh air to adjust the temperature and humidity of the fresh air entering each room. The mixing section is located on one side of the fresh air unit and includes multiple mixing passages. The number of mixing passages is equal to the number of indoor units in the power-on state. Each mixing passage is used to mix the fresh air output from the fresh air outlet with the outdoor fresh air introduced by the outdoor fresh air duct. The control unit is configured as follows: In the first mode of cooling the air in at least one room, based on the minimum set temperature or the minimum set humidity among the set temperatures or set humidity of each indoor unit when it is turned on, the fresh air temperature of the fresh air output from the fresh air unit is controlled to be equal to the minimum set temperature or the fresh air humidity is equal to the minimum set humidity. Furthermore, by processing the outdoor fresh air and the fresh air output from the fresh air unit in the mixing section, the temperature of the air entering each room is equal to the set temperature or humidity of each room. In the second mode of heating the air in at least one room, the fresh air temperature is controlled to be equal to the maximum set temperature among the set temperatures of each indoor unit when it is turned on. Furthermore, the outdoor fresh air and the fresh air flow output by the fresh air unit are processed in the mixing section to make the temperature of the airflow entering each room equal to the set temperature of each room.
2. The multi-split fresh air system according to claim 1, characterized in that, The air mixing passage has three interconnected ventilation openings, including a first ventilation opening, a second ventilation opening, and a third ventilation opening; A first airflow regulating element is provided at the first ventilation opening to adjust the flow rate of the fresh air output from the fresh air outlet; A second airflow regulating element is provided at the second ventilation opening to adjust the flow rate of outdoor fresh air introduced from the outdoor fresh air duct; The fresh air flow rate and the outdoor fresh air volume are mixed and then delivered to the room to which the corresponding indoor unit belongs through the third ventilation opening.
3. The multi-split fresh air system according to claim 1, characterized in that, Also includes: An additional outdoor heat exchanger is connected to the outdoor unit via a throttling device and is located in the air supply duct of the fresh air unit. The additional outdoor heat exchanger is located on the side of the heat exchanger away from the total heat exchange core and is used to preheat the cold airflow that has undergone energy exchange with the total heat exchange core and passed through the heat exchanger when dehumidifying the room air.
4. The multi-split fresh air system according to claim 3, characterized in that, The control unit is configured to adjust the opening of the throttling device to adjust the refrigerant flow rate through the additional outdoor heat exchanger.
5. The multi-split fresh air system according to claim 1, characterized in that, Also includes: An air purification unit is installed in the fresh air duct of the fresh air unit and close to the fresh air inlet.
6. The multi-split fresh air system according to claim 5, characterized in that, The air purification unit includes: Ultraviolet germicidal lamps are used to irradiate the fresh air duct with ultraviolet light; and / or A coarse filter is disposed near the fresh air inlet; and / or Negative ion generator; and / or Micro-electrostatic module.