Fresh air humidifying machine and control method thereof

Abstract

The invention discloses a fresh air humidifying machine which comprises a first adsorption unit and a second adsorption unit. When one of the first main heat exchanger and the second main heat exchanger serves as a main evaporator, the other serves as a main condenser; the first auxiliary heat exchanger is arranged on the air outlet side of the first adsorption unit and is used as an auxiliary evaporator or an auxiliary condenser; the second auxiliary heat exchanger is arranged on the air outlet side of the second adsorption unit and is used as an auxiliary evaporator or an auxiliary condenser; the controller is used for enabling the first main heat exchanger, the second main heat exchanger and the auxiliary evaporator to communicate when the air supply temperature is higher than the set temperature in the refrigeration and dehumidification mode under the condition that the absolute value of the indoor and outdoor air temperature difference is not smaller than the first preset temperature allowance value. In the heating and humidifying mode, when the air supply temperature is lower than the set temperature, the first main heat exchanger, the second main heat exchanger and the auxiliary condenser are communicated. The fresh air humidifying machine can improve the system energy efficiency.

Description

Technical Field

[0001] The present application relates to the field of air treatment technology, and in particular to a fresh air humidifier and a control method thereof. Background Art

[0002] Fresh air humidifiers are mainly used to introduce humidified fresh air into the room. They usually have two air ducts, one for exhaust and the other for supply. In summer dehumidification, the fresh air is cooled by the evaporator, and the moisture it carries is adsorbed on the adsorption material to dehumidify the fresh air; under certain conditions, the air duct is switched, the evaporator becomes a condenser, the indoor return air is heated by the condenser, and then the moisture inside the adsorption material is dried out and taken away; in winter humidification, the principle is the opposite, the indoor return air is cooled by the evaporator, and the moisture it carries is adsorbed on the adsorption material for storage; under certain conditions, the air duct is switched, the evaporator becomes a condenser, the fresh air is heated by the condenser, the moisture on the adsorption material is dried out and sent to the room to humidify the fresh air.

[0003] The temperature of outdoor air changes after passing through the adsorption material, which will cause the energy efficiency of the system to decrease. Summary of the invention

[0004] The present application provides a fresh air humidifier, which can improve the energy efficiency of the system and ensure that the heat and humidity load of the fresh air is in a comfortable range.

[0005] In one aspect of the present application, a fresh air humidifier comprises: a first adsorption unit and a second adsorption unit, each having a moisture adsorbent, wherein one of the first adsorption unit and the second adsorption unit is used for adsorbing moisture, and the other is used for regenerating the adsorbent; a ventilation switching device for switching between air flowing through the first adsorption unit and air flowing through the second adsorption unit; a refrigerant circuit comprising: a compressor, an electronic expansion valve, a four-way valve, a heat exchanger, and a valve switch; the valve switch is used for controlling the connection or disconnection of the heat exchanger in the refrigerant circuit;

[0006] Wherein, the heat exchanger comprises: a first main heat exchanger, which is arranged on the windward side of the first adsorption unit; a second main heat exchanger, which is arranged on the windward side of the second adsorption unit, when one of the second main heat exchanger and the first main heat exchanger is used as the main evaporator, the other is used as the main condenser; a first auxiliary heat exchanger, which is arranged on the air outlet side of the first adsorption unit, when the first auxiliary heat exchanger is used as the auxiliary evaporator, the first main heat exchanger is used as the main evaporator, and when the first auxiliary heat exchanger is used as the auxiliary condenser, the first main heat exchanger is used as the main condenser; a second auxiliary heat exchanger, which is arranged on the air outlet side of the second adsorption unit, when one of the second auxiliary heat exchanger and the first auxiliary heat exchanger is used as the auxiliary evaporator, the other is used as the auxiliary condenser;

[0007] It also includes: an outdoor temperature and humidity detection device for detecting the temperature and humidity of outdoor air; an indoor temperature and humidity detection device for detecting the temperature and humidity of indoor air; an outdoor air supply temperature and humidity detection device for detecting the temperature and humidity of fresh air supply;

[0008] The fresh air humidifier can operate at least one of a cooling and dehumidification mode and a heating and humidification mode;

[0009] The controller of the fresh air humidifier is used to: when the absolute value of the temperature difference between indoor and outdoor air is not less than the first preset temperature tolerance value:

[0010] In the cooling and dehumidification mode, when the supply air temperature is higher than the set temperature, the first main heat exchanger, the second main heat exchanger and the auxiliary evaporator are connected;

[0011] In the heating and humidifying mode, when the supply air temperature is lower than the set temperature, the first main heat exchanger, the second main heat exchanger and the auxiliary condenser are connected.

[0012] In some embodiments, the heat exchange area of ​​the first auxiliary heat exchanger is smaller than that of the first main heat exchanger, and the heat exchange area of ​​the second auxiliary heat exchanger is smaller than that of the second main heat exchanger;

[0013] The controller is used to: when the absolute value of the indoor and outdoor air temperature difference is less than the first preset temperature tolerance value, perform the heat exchanger on-off control step: connect the first auxiliary heat exchanger and the second auxiliary heat exchanger, and disconnect the first main heat exchanger and the second main heat exchanger.

[0014] In some embodiments, the controller is used to control the compressor to reduce frequency when the absolute value of the temperature difference between indoor and outdoor air is less than a first preset temperature tolerance value.

[0015] In some embodiments, the controller is used to: compare the supply air temperature with the set temperature after the control step of turning the heat exchanger on and off:

[0016] In the cooling and dehumidification mode, when the supply air temperature is higher than the set temperature, the opening of the electronic expansion valve is reduced; when the supply air temperature is lower than the set temperature, the opening of the electronic expansion valve is increased;

[0017] In the heating and humidification mode, when the supply air temperature is higher than the set temperature, the opening of the electronic expansion valve is increased; when the supply air temperature is lower than the set temperature, the opening of the electronic expansion valve is reduced.

[0018] In some embodiments, the controller is used to: in the cooling and dehumidification mode, when the supply air temperature is equal to the set temperature, determine whether the exhaust air temperature is less than the heat recovery preset value, and if not, connect the auxiliary condenser.

[0019] In some embodiments, the controller is used to: when the supply air temperature is equal to the set temperature, determine whether the supply air humidity is equal to the set humidity, and if not, adjust the frequency of the compressor;

[0020] If the air supply humidity is still not equal to the set humidity after adjusting the compressor frequency, adjust the opening of the electronic expansion valve;

[0021] If the supply air humidity is still not equal to the set humidity after adjusting the opening of the electronic expansion valve, adjust the air volume.

[0022] In some embodiments, the controller is used to: in the air-conditioning mode, when the absolute value of the indoor and outdoor air temperature difference is not greater than the second preset temperature tolerance value, connect the first auxiliary heat exchanger and the second auxiliary heat exchanger, and disconnect the first main heat exchanger and the second main heat exchanger;

[0023] When the absolute value of the indoor and outdoor air temperature difference is greater than the third preset temperature tolerance value, the first main heat exchanger, the second main heat exchanger, the first auxiliary heat exchanger, and the second auxiliary heat exchanger are all connected;

[0024] When the absolute value of the indoor and outdoor air temperature difference is greater than the second preset temperature tolerance value and not greater than the third preset temperature tolerance value, the first main heat exchanger and the second main heat exchanger are connected, and the first auxiliary heat exchanger and the second auxiliary heat exchanger are disconnected.

[0025] In some embodiments, the controller is used to: in the automatic mode, when the set humidity is between the outdoor air humidity and the indoor air humidity and the absolute value of the indoor and outdoor air humidity difference is less than the preset humidity tolerance value, and the set temperature is between the outdoor air temperature and the indoor air temperature and the absolute value of the indoor and outdoor air temperature difference is less than the first preset temperature tolerance value, operate the full heat exchange mode;

[0026] When the set humidity is between the outdoor air humidity and the indoor air humidity and the absolute value of the indoor and outdoor air humidity difference is less than the preset humidity tolerance value, and the set temperature is not between the outdoor air temperature and the indoor air temperature, the air conditioning mode is operated;

[0027] When the set humidity is not between the outdoor air humidity and the indoor air humidity, the humidity control mode is operated.

[0028] In some embodiments, when the set temperature is between the outdoor air temperature and the indoor air temperature and the absolute value of the indoor and outdoor air temperature difference is less than the first preset temperature tolerance value, and the indoor and outdoor air humidity is greater than the set humidity, the cooling and dehumidification mode is operated;

[0029] When the set temperature is between the outdoor air temperature and the indoor air temperature and the absolute value of the indoor and outdoor air temperature difference is less than the first preset temperature tolerance value, and the indoor and outdoor air humidity is less than the set humidity, the heating and humidification mode is operated.

[0030] Another aspect of the present application is a control method for a fresh air humidifier, the fresh air humidifier comprising: a first adsorption unit and a second adsorption unit, each having a moisture adsorbent, one of the first adsorption unit and the second adsorption unit being used for adsorbing moisture, and the other being used for regenerating the adsorbent; a ventilation switching device for switching between air flowing through the first adsorption unit and air flowing through the second adsorption unit;

[0031] The refrigerant circuit includes: a compressor, an electronic expansion valve and a four-way valve; a main heat exchanger, which is arranged on the windward side of the first adsorption unit;

[0032] The second main heat exchanger is arranged on the windward side of the second adsorption unit. When one of the second main heat exchanger and the first main heat exchanger is used as the main evaporator, the other one is used as the main condenser. The first auxiliary heat exchanger is arranged on the air outlet side of the first adsorption unit. When the first auxiliary heat exchanger is used as the auxiliary evaporator, the first main heat exchanger is used as the main evaporator. When the first auxiliary heat exchanger is used as the auxiliary condenser, the first main heat exchanger is used as the main condenser. The second auxiliary heat exchanger is arranged on the air outlet side of the second adsorption unit. When one of the second auxiliary heat exchanger and the first auxiliary heat exchanger is used as the auxiliary evaporator, the other one is used as the auxiliary condenser.

[0033] The fresh air humidifier can operate at least one of a cooling and dehumidification mode and a heating and humidification mode;

[0034] The control method includes: obtaining the indoor and outdoor air temperatures and the supply air temperature of the fresh air; in the cooling and dehumidification mode, when the supply air temperature is higher than the set temperature, the first main heat exchanger, the second main heat exchanger and the auxiliary evaporator are connected; in the heating and humidification mode, when the supply air temperature is lower than the set temperature, the first main heat exchanger, the second main heat exchanger and the auxiliary condenser are connected. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of a fresh air humidifier according to some embodiments is shown;

[0036] Figure 2 Shows Figure 1 Sectional view along the XX axis;

[0037] Figure 3 Shows Figure 1 Cross-sectional views of two states along the YY axis;

[0038] Figure 4 A schematic diagram of a refrigerant circuit of a fresh air humidifier according to some embodiments is shown;

[0039] Figure 5 Schematic diagrams of fresh air humidifiers according to other embodiments are shown;

[0040] Figure 6 A schematic diagram showing a refrigerant circuit of a fresh air humidifier according to some other embodiments is shown;

[0041] Figure 7 A control block diagram of a fresh air humidifier according to some embodiments is shown;

[0042] Figure 8 A flow chart of a fresh air humidifier in air conditioning mode according to some embodiments is shown;

[0043] Fig. 9 A flow chart of a fresh air humidifier in a humidity control mode according to some embodiments is shown;

[0044] Fig.10 A flow chart showing a fresh air humidifier in automatic mode according to some embodiments is shown;

[0045] Fig.11 A flow chart of a fresh air humidifier in air conditioning mode according to other embodiments is shown;

[0046] Fig.12 A flow chart of a fresh air humidifier in a cooling and dehumidification mode according to other embodiments is shown;

[0047] Fig.13 A flow chart of a fresh air humidifier in a heating and humidification mode according to other embodiments is shown. DETAILED DESCRIPTION

[0048] In order to make the purpose and implementation method of the present application clearer, the exemplary implementation method of the present application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0049] The terms "first", "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0050] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0051] Reference Figures 1 to 3 According to the embodiment of the present application, the fresh air humidifier includes a casing 100.

[0052] The housing 100 is provided with a fresh air inlet OA, a fresh air supply outlet SA, a return air inlet RA and a return air exhaust outlet EA. The fresh air inlet OA and the return air exhaust outlet EA are both connected to the outside, and the fresh air supply outlet SA and the return air inlet RA are both connected to the room.

[0053] An air processing chamber is provided in the housing 100, and the air processing chamber is used for dehumidifying or humidifying fresh air.

[0054] The air processing chamber includes a first air processing chamber 121 and a second air processing chamber 122. The first air processing chamber is provided with a first main heat exchanger 13 and a first adsorption unit 310, and the second air processing chamber 122 is provided with a second main heat exchanger 14 and a second adsorption unit 320. The first main heat exchanger 13 is located in front of the first adsorption unit 310, and the second main heat exchanger 14 is located in front of the second adsorption unit 320.

[0055] It should be noted that "front" and "rear" are relative concepts with reference to the air flow direction, and the place where the air flows first is the front, and the place where the air flows later is the rear. That is, the air in the first air processing chamber 121 flows through the first main heat exchanger 13 and the first adsorption unit 310 in sequence, and the air in the second air processing chamber 122 flows through the second main heat exchanger 14 and the second adsorption unit 320 in sequence.

[0056] The materials of the first adsorption unit 310 and the second adsorption unit 320 may be MOF polymer, silica gel, or the like.

[0057] The air processing chamber is located in the middle of the housing 100. A ventilation switching device is provided at the front and rear ends of the air processing chamber, and the ventilation switching device can be switched between a first state and a second state. In the first state, the first air processing chamber 121 is connected to the fresh air inlet OA and the fresh air supply port SA, and the second air processing chamber 122 is connected to the return air inlet RA and the return air exhaust port EA; in the second state, the first air processing chamber 121 is connected to the return air inlet RA and the return air exhaust port EA, and the second air processing chamber 122 is connected to the fresh air inlet OA and the fresh air supply port SA.

[0058] It should be noted that the ventilation switching device is applicable to the existing technology and will not be described in detail here.

[0059] Specifically, the ventilation switching device includes a front ventilation switching device 410 located at the front end and a rear ventilation switching device 420 located at the rear end.

[0060] The fresh air humidifier further includes a blower 210 and an exhaust fan 220. The blower 210 is arranged corresponding to the fresh air supply outlet SA, and the exhaust fan 220 is arranged corresponding to the return air exhaust outlet EA.

[0061] In the first state of the fresh air humidifier, under the action of the supply fan 210, outdoor air enters from the fresh air inlet OA, passes through the first main heat exchanger 13 and the first adsorption unit 310 in the first air treatment chamber 121 in sequence, and is finally sent to the room through the fresh air supply port SA; under the action of the exhaust fan 220, indoor air enters from the return air inlet RA, passes through the second main heat exchanger 14 and the second adsorption unit 320 in the second air treatment chamber 122 in sequence, and is finally discharged to the outside through the return air exhaust port EA.

[0062] In the second state of the fresh air humidifier, under the action of the supply fan 210, outdoor air enters from the fresh air inlet OA, passes through the second main heat exchanger 14 and the second adsorption unit 320 in the second air treatment chamber 122 in sequence, and is finally sent to the room through the fresh air supply port SA; under the action of the exhaust fan 220, indoor air enters from the return air inlet RA, passes through the first main heat exchanger 13 and the first adsorption unit 310 in the first air treatment chamber 121 in sequence, and is finally discharged to the outside through the return air exhaust port EA.

[0063] In some embodiments, the housing 100 further includes a heat recovery processing chamber 110. The total heat exchanger 500 is disposed in the heat recovery processing chamber 110 to exchange heat between outdoor air and indoor air.

[0064] Specific reference Figure 2 The heat recovery processing chamber 110 is divided into four areas around the total heat exchanger 500 by the total heat exchanger 500, namely, a fresh air inlet area 111 and a return air inlet area 113 located at the front side of the total heat exchanger 500, and a fresh air heat exchange area 112 and a return air heat exchange area 114 located at the rear side of the total heat exchanger 500. The fresh air inlet OA is located on the side wall of the fresh air inlet area 111, and the return air inlet RA is set on the side wall of the return air inlet area 113.

[0065] Outdoor air enters the fresh air inlet area 111 from the fresh air inlet OA, and flows to the fresh air heat exchange area 112 after passing through the total heat exchanger 500; indoor air enters the return air inlet area 113 from the return air inlet RA, and flows to the return air heat exchange area 114 after passing through the total heat exchanger 500.

[0066] The heat recovery processing chamber 110 is located at the front side of the air processing chamber.

[0067] When the front ventilation switching device 410 is in the first state, the first air processing chamber 121 is connected to the fresh air heat exchange zone 112, and the second air processing chamber 122 is connected to the return air heat exchange zone 114; when the front ventilation switching device 410 is in the second state, the first air processing chamber 121 is connected to the return air heat exchange zone 114, and the second air processing chamber 122 is connected to the fresh air heat exchange zone 112.

[0068] Reference Figure 1 and Figure 4 In addition to the first main heat exchanger 13 and the second main heat exchanger 14 , the refrigerant circuit also includes a compressor 11 , a four-way valve 12 and an electronic expansion valve 15 .

[0069] The exhaust port of the compressor 11 is connected to the first port of the four-way valve 12, the third port of the four-way valve 12 is connected in series with the gas-liquid separator 16 and then connected to the intake port of the compressor 11, and the second port of the four-way valve 12 is connected in series with the second main heat exchanger 14, the electronic expansion valve 15, and the first main heat exchanger 13 and then connected to the fourth port of the four-way valve 12.

[0070] According to an embodiment of the present application, the housing 100 is further provided with a compressor chamber 130 and an electrical chamber 140 on the front side of the heat recovery processing chamber 110. The compressor 11, the four-way valve 12 and the gas-liquid separator 16 are arranged in the compressor chamber 130, and the electrical control box of the fresh air humidifier is arranged in the electrical chamber 140.

[0071] In other embodiments, reference Figure 5 The air processing chamber is separated into a compressor chamber 130. The electric control box is connected to the outer wall of the casing 100, so that the size of the fresh air humidifier can be more compact and the volume is relatively small.

[0072] Continue to refer to Figure 4 The compressor 11 compresses the refrigerant; one of the first main heat exchanger 13 and the second main heat exchanger 14 performs heat exchange between indoor air and the refrigerant, and the other performs heat exchange between outdoor air and the refrigerant; the four-way valve 12 selectively guides the refrigerant compressed by the compressor 11 to the first main heat exchanger 13 or the second main heat exchanger 14 according to heating or cooling; the electronic expansion valve 15 decompresses the refrigerant; the gas pressure separator 16 prevents the unevaporated refrigerant from flowing to the compressor 11.

[0073] The four-way valve 12 can be switched to any one of a first state and a second state. In the first state, the exhaust port of the compressor 11 is connected to the second main heat exchanger 14, and the intake port of the compressor 11 is connected to the first main heat exchanger 13. That is, in the first state, the second main heat exchanger 14 functions as a condenser, and the first main heat exchanger 13 functions as an evaporator.

[0074] The first main heat exchanger 13 acts as an evaporator to adjust the air temperature at the adsorption end of the first adsorption unit 310. The first adsorption unit 310 absorbs water through the adsorption action of the adsorbent therein, thereby drying the air in the first air treatment chamber 121. The second main heat exchanger 14 acts as a condenser to adjust the regeneration end temperature of the second adsorption unit 320. The second adsorption unit 320 evaporates water from the adsorbent through the regeneration action of the adsorbent, thereby humidifying the air in the second air treatment chamber 122.

[0075] In the second state of the four-way valve, the exhaust port of the compressor 11 is connected to the first main heat exchanger 13, and the intake port of the compressor 11 is connected to the second main heat exchanger 14. That is, in the second state, the first main heat exchanger 13 functions as a condenser, and the second main heat exchanger 14 functions as an evaporator.

[0076] The second main heat exchanger 14 acts as an evaporator to adjust the air temperature at the adsorption end of the second adsorption unit 320. The second adsorption unit 320 absorbs water through the adsorption action of the adsorbent therein, thereby drying the air in the second air treatment chamber 122. The first main heat exchanger 13 acts as a condenser to adjust the regeneration end temperature of the first adsorption unit 310. The first adsorption unit 310 evaporates water from the adsorbent through the regeneration action of the adsorbent, thereby humidifying the air in the first air treatment chamber 121.

[0077] The four-way valve 12 and the ventilation switching device periodically switch between the first state and the second state. Therefore, whenever the four-way valve 12 and the ventilation switching device switch, the functions of the first main heat exchanger 13 and the second main heat exchanger 14 are switched, the functions of the first adsorption unit 121 and the second adsorption unit 320 are switched, and the air in the first air processing chamber 121 and the air in the second air processing chamber 122 are switched. Thus, water absorption and discharge are repeated.

[0078] A first auxiliary heat exchanger 17 and a second auxiliary heat exchanger 18 are also provided in the air processing chamber. The first auxiliary heat exchanger 17 is located on the rear side of the first adsorption unit 310, that is, the first main heat exchanger 13 and the first auxiliary heat exchanger 17 are respectively located on the front and rear sides of the first adsorption unit 310; the second auxiliary heat exchanger 18 is located on the rear side of the second adsorption unit 320, that is, the second main heat exchanger 14 and the second auxiliary heat exchanger 18 are respectively located on the front and rear sides of the second adsorption unit 320.

[0079] In the refrigerant circuit, the first auxiliary heat exchanger 17 is connected in parallel to both ends of the first main heat exchanger 13 , and the second auxiliary heat exchanger 18 is connected in parallel to both ends of the second main heat exchanger 14 .

[0080] For the convenience of description, in this application, the one of the first main heat exchanger 13 and the second main heat exchanger 14 that serves as an evaporator is called the main evaporator, and the one that serves as a condenser is called the main condenser; the one of the first auxiliary heat exchanger 17 and the second auxiliary heat exchanger 18 that serves as an evaporator is called the auxiliary evaporator, and the one that serves as a condenser is called the auxiliary condenser.

[0081] In some embodiments, the refrigerant circuit further includes a valve switch for controlling the on and off of the heat exchanger in the refrigerant circuit.

[0082] Specifically, the valve switch may include a first auxiliary valve switch 171 and a second auxiliary valve switch 181. The valve switch may be a solenoid valve.

[0083] The first auxiliary valve switch 171 is connected in series to the branch where the first auxiliary heat exchanger 17 is located. When the first auxiliary valve switch 171 is connected, the branch where the first auxiliary heat exchanger 17 is located is connected, that is, the first auxiliary heat exchanger 17 is connected in the refrigerant circuit; when the first auxiliary valve switch 171 is disconnected, the branch where the first auxiliary heat exchanger 17 is located is not connected, that is, the first auxiliary heat exchanger 17 is not connected in the refrigerant circuit.

[0084] The second auxiliary valve switch 181 is connected in series to the branch where the second auxiliary heat exchanger 18 is located. When the second auxiliary valve switch 181 is connected, the branch where the second auxiliary heat exchanger 18 is located is connected, that is, the second auxiliary heat exchanger 18 is connected in the refrigerant circuit. When the second auxiliary valve switch 181 is disconnected, the branch where the second auxiliary heat exchanger 18 is located is not connected, that is, the second auxiliary heat exchanger 18 is not connected in the refrigerant circuit.

[0085] The working mode of the fresh air humidifier is introduced below.

[0086] The fresh air humidifier can operate in full heat exchange mode, air conditioning cooling / heating mode, and cooling and dehumidification / heating and humidification mode.

[0087] [Full heat exchange mode]

[0088] This mode is mainly used when the indoor and outdoor temperature and humidity are not much different and the outdoor temperature and humidity are in the comfortable zone.

[0089] In this mode, the refrigerant circuit stops, the adsorption unit does not function, only the total heat exchanger 500 functions, the ventilation switching device switches from the initial state to the given state, the fresh air humidifier supplies outdoor air to the room and exhausts the indoor air to the outside.

[0090] The initial state of the ventilation switching device is a half-open state, and the given state may be, for example, the first state.

[0091] [Air conditioning cooling mode]

[0092] This mode is mainly used when the outdoor temperature is higher than the indoor temperature and the indoor latent heat load is not large.

[0093] In this mode, the ventilation switching device is in a given state, such as the first state, the refrigerant circuit is running, the fresh air humidifier cools the outdoor air and supplies it to the room, and heats the indoor air and discharges it to the outside.

[0094] In the refrigerant circuit, the four-way valve is in a given state, for example, the first state, the first auxiliary valve switch 171 and the second auxiliary valve switch 181 are disconnected, the compressor 11 compresses the refrigerant to a high pressure, and as the refrigerant is compressed, the pressure and temperature of the refrigerant increase; the compressed refrigerant is guided to the second main heat exchanger 14 through the four-way valve 12, the refrigerant is condensed in the second main heat exchanger 14, and heat exchange between the refrigerant and the indoor air of the second air treatment chamber is performed while the refrigerant is condensed. The refrigerant is decompressed by the electronic expansion valve 15, and the temperature of the refrigerant is reduced; the decompressed liquid refrigerant is evaporated by the first main heat exchanger 14, and heat exchange between the refrigerant and the outdoor air of the first air treatment chamber is performed while the refrigerant evaporates. The second main heat exchanger 14 is used as a main condenser to heat the indoor air of the second air treatment chamber, and the first main heat exchanger 14 is used as a main evaporator to cool the outdoor air of the first air treatment chamber.

[0095] [Air conditioning heating mode]

[0096] This mode is mainly used when the outdoor temperature is lower than the indoor temperature and the indoor latent heat load is not large.

[0097] In this mode, the ventilation switching device is in a given state, such as the first state, the refrigerant circuit is running, the fresh air humidifier heats up the outdoor air and supplies it to the room, and cools down the indoor air and discharges it to the outside.

[0098] In the refrigerant circuit, the four-way valve is in a state different from that in cooling, for example, in the second state, the first auxiliary valve switch 171 and the second auxiliary valve switch 181 are disconnected, the compressor 11 compresses the refrigerant to a high pressure, and as the refrigerant is compressed, the pressure and temperature of the refrigerant increase; the compressed refrigerant is guided to the first main heat exchanger 13 through the four-way valve 12, the refrigerant is condensed in the first main heat exchanger 13, and heat exchange is performed between the refrigerant and the outdoor air of the first air treatment chamber while the refrigerant is condensed. The refrigerant is decompressed by the electronic expansion valve 15, and the temperature of the refrigerant is reduced; the decompressed liquid refrigerant is evaporated by the second main heat exchanger 14, and heat exchange is performed between the refrigerant and the indoor air of the second air treatment chamber while the refrigerant evaporates. The second main heat exchanger 14 is used as a main evaporator to cool the indoor air of the second air treatment chamber, and the first main heat exchanger 14 is used as a main condenser to heat the outdoor air of the first air treatment chamber.

[0099] [Cooling and dehumidifying mode]

[0100] This mode is mainly used in situations where high temperature and humidity difference exist and refrigeration and dehumidification are required.

[0101] In this mode, the total heat exchanger 500, the refrigerant circuit, and the adsorption unit all function, and thus the four-way valve 12 and the ventilation switching device are periodically switched:

[0102] In the first half of a single cycle, the four-way valve 12 and the ventilation switching device are in the first state, the first main heat exchanger 13 acts as a main evaporator to cool the outdoor air, the first adsorption unit 310 absorbs moisture and dehumidifies the outdoor air, and the cooled and dehumidified outdoor air is supplied to the room; the second main heat exchanger 14 acts as a main condenser to heat the indoor air, and when the high-temperature air passes through the second adsorption unit 320, the adsorbent containing water in the second adsorption unit 320 is regenerated, thereby giving the water contained in the adsorbent to the indoor air, and the indoor air is discharged to the outdoors.

[0103] In the second half of a single cycle, the four-way valve 12 and the ventilation switching device are in the second state, the second main heat exchanger 14 acts as a main evaporator to cool the outdoor air, the second adsorption unit 320 absorbs moisture and dehumidifies the outdoor air, and the cooled and dehumidified outdoor air is supplied to the room; the first main heat exchanger 13 acts as a main condenser to heat the indoor air, and when the high-temperature air passes through the first adsorption unit 310, the adsorbent containing water in the first adsorption unit 310 is regenerated, thereby giving the water contained in the adsorbent to the indoor air, and the indoor air is discharged to the outdoors.

[0104] In this mode, according to different environmental conditions, the heat exchanger has three working modes. In the first mode, the first auxiliary valve switch 171 and the second auxiliary valve switch 181 are both disconnected, the first auxiliary heat exchanger 17 and the second auxiliary heat exchanger 18 do not work, and only the first main heat exchanger 13 and the second main heat exchanger 14 work; the refrigerant circuit is the same as the air conditioning cooling mode in the first half of a single cycle, and the same as the air conditioning heating mode in the second half of a single cycle.

[0105] The second form: the first main heat exchanger 13, the second main heat exchanger 14, and the auxiliary evaporator located on the outdoor air flow path are working, and the auxiliary evaporator can be used to adjust the supply air temperature; in the first half of a single cycle of the refrigerant circuit, the compressor 11→four-way valve 12→second main heat exchanger 14→electronic expansion valve 15→first auxiliary heat exchanger 17 and first main heat exchanger 13→gas-liquid separator 16→compressor 11; in the second half of a single cycle of the refrigerant circuit, the compressor 11→four-way valve 12→first main heat exchanger 13→electronic expansion valve 15→second auxiliary heat exchanger 18 and second main heat exchanger 14→gas-liquid separator 16→compressor 11.

[0106] The third form: the first main heat exchanger 13, the second main heat exchanger 14, and the auxiliary condenser located on the indoor air flow path work, and the auxiliary condenser can be used to recover the heat of the indoor air. In the first half of a single cycle of the refrigerant circuit, the compressor 11→four-way valve 12→the second main heat exchanger 14 and the second auxiliary heat exchanger 18→the electronic expansion valve 15→the first main heat exchanger 13→the gas-liquid separator 16→the compressor 11; in the second half of a single cycle of the refrigerant circuit, the compressor 11→the four-way valve 12→the first main heat exchanger 13 and the first auxiliary heat exchanger 17→the electronic expansion valve 15→the second main heat exchanger 14→the gas-liquid separator 16→the compressor 11.

[0107] [Heating and humidification mode]

[0108] This mode is mainly used in situations where there is a high temperature and humidity difference and heating and humidification are required.

[0109] In this mode, the total heat exchanger 500, the refrigerant circuit, and the adsorption unit all function, and are therefore accompanied by periodic switching of the four-way valve 12 and the ventilation switching device: in the first half of a single cycle, the four-way valve 12 is in the second state, and the ventilation switching device is in the first state; in the second half of a single cycle, the four-way valve 12 is in the first state, and the ventilation switching device is in the second state.

[0110] The main condenser heats the outdoor air, and the adsorption unit in the outdoor air flow path regenerates the adsorbent containing water. As a result, the water contained in the adsorbent is added to the outdoor air, and the humidified outdoor air is supplied to the room; the main evaporator cools the indoor air, and the adsorption unit in the indoor air flow path absorbs moisture, thereby absorbing water from the indoor air and exhausting the indoor air to the outside. The water absorbed from the indoor air becomes the water that humidifies the outdoor air.

[0111] In this mode, the heat exchanger has two working modes according to different environmental conditions:

[0112] The first form: the first auxiliary valve switch 171 and the second auxiliary valve switch 181 are both disconnected, the first auxiliary heat exchanger 17 and the second auxiliary heat exchanger 18 do not work, and only the first main heat exchanger 13 and the second main heat exchanger 14 work; the refrigerant circuit is in the same air conditioning heating mode in the first half of a single cycle, and in the same air conditioning cooling mode in the second half of a single cycle.

[0113] The second form: the first main heat exchanger 13, the second main heat exchanger 14 are working, and the auxiliary condenser located on the outdoor air flow path is working, and the auxiliary condenser can be used to adjust the supply air temperature. The refrigerant circuit in the first half of a single cycle: compressor 11 → four-way valve 12 → first main heat exchanger 13 and first auxiliary heat exchanger 17 → electronic expansion valve 15 → second main heat exchanger 14 → gas-liquid separator 16 → compressor 11; the refrigerant circuit in the second half of a single cycle: compressor 11 → four-way valve 12 → second main heat exchanger 14 and second auxiliary heat exchanger 18 → electronic expansion valve 15 → first main heat exchanger 13 → gas-liquid separator 16 → compressor 11.

[0114] Generally speaking, the temperature difference between indoor and outdoor is not much in spring and autumn, and the temperature is relatively comfortable; while in summer and winter, the temperature difference between indoor and outdoor is relatively large. Therefore, the full heat exchange mode is mostly used in spring and autumn, and fresh air is introduced into the room through the fresh air humidifier to improve the indoor air quality.

[0115] Air conditioning refrigeration and refrigeration and dehumidification modes are mostly used in summer. The difference between the two is that in air conditioning refrigeration mode, when the ambient humidity is comfortable, the fresh air humidifier only controls operations according to temperature; in refrigeration and dehumidification mode, when the ambient humidity is uncomfortable, the fresh air humidifier controls operations according to both temperature and humidity.

[0116] Similarly, air conditioning heating and heating and humidification modes are mostly used in winter. The difference between the two is that in air conditioning heating mode, the ambient humidity is comfortable, and the fresh air humidifier is only controlled according to temperature; in heating and humidification mode, the ambient humidity is uncomfortable, and the fresh air humidifier is controlled according to both temperature and humidity.

[0117] Hereinafter, signal flows between components included in the fresh air humidifier will be described.

[0118] Reference Figure 7 The fresh air humidifier includes a controller 600, a memory 610, an input unit 620, an outdoor temperature and humidity detection device 630, an indoor temperature and humidity detection device 640 and an indoor exhaust air temperature detection device 650.

[0119] The controller 600 is used to control the operation of the compressor 11, the four-way valve 12, the electronic expansion valve 15, the valve switch, the ventilation switching device, the blower 210 and the exhaust fan 220 according to different working modes.

[0120] The memory 610 is used to store programs and data related to the operation of the fresh air humidifier.

[0121] The input unit 620 is used to receive operation commands regarding the fresh air humidifier from the user.

[0122] The outdoor temperature and humidity detection device 630 is used to detect the temperature Toa and humidity doa of the outdoor air. The outdoor temperature and humidity detection device 630 can be set at the fresh air inlet OA.

[0123] The indoor temperature and humidity detection device 640 is used to detect the temperature Toa and humidity doa of the indoor air. The outdoor temperature and humidity detection device 630 can be set at the return air inlet RA.

[0124] The outdoor air supply temperature and humidity detection device 650 is used to detect the temperature Tsa and humidity dsa of the outdoor air supply. The outdoor air supply temperature and humidity detection device 650 can be set at the fresh air supply outlet SA.

[0125] The indoor exhaust air temperature detection device 660 is used to detect the temperature Tea of ​​the indoor exhaust air. The outdoor exhaust air temperature detection device 660 can be set at the return air outlet EA.

[0126] The steps for controlling the fresh air humidifier are introduced in detail below.

[0127] The fresh air humidifier is started, and the supply fan 210 and the exhaust fan 220 are controlled to start at the preset default wind speed.

[0128] [Full heat exchange mode]

[0129] After receiving the full heat exchange mode input by the user, the compressor is kept stopped and the ventilation switching device is controlled to be in the first state.

[0130] [Air conditioning cooling mode]

[0131] Reference Figure 8, receiving the air conditioning cooling mode and set temperature Tset input by the user, controlling the compressor to start, the first auxiliary valve switch 171 and the second auxiliary switch 181 are in the disconnected state, and the four-way valve and the ventilation switching device operate in the first state.

[0132] Steps for temperature adjustment: Compare the supply air temperature Tsa with the user set temperature Tset. If they are equal, no change is required.

[0133] If Tsa>Tset, it means that the air supply temperature is higher than the temperature expected by the user, and cooling needs to be strengthened, then the compressor frequency is controlled to increase, and the compressor can increase the frequency according to the first preset increment, for example, the first preset increment is 3Hz. The compressor frequency increase can improve the cooling effect and reduce the air supply temperature Tsa; after the frequency increase, after the first preset time, Tsa and Tset are compared again. If Tsa is still greater than Tset, the opening of the electronic expansion valve 15 is reduced. The opening of the electronic expansion valve 15 is reduced, which can reduce the evaporation temperature, thereby reducing the air supply temperature Tsa; after the opening is reduced, after the first preset time, Tsa and Tset are compared again. If Tsa is still greater than Tset, the cycle returns to the control of the compressor frequency increase.

[0134] In other embodiments, when Tsa>Tset, the opening of the electronic expansion valve 15 may be directly reduced.

[0135] If Tsa<Tset, it means that the supply air temperature is lower than the temperature expected by the user, and the fresh air humidifier can reduce the cooling power, then the compressor is controlled to reduce the frequency, and the compressor can be reduced according to the first preset reduction, for example, the first preset reduction is 3Hz. The compressor frequency reduction can reduce the cooling effect, so that the supply air temperature Tsa increases; after the frequency reduction, after the first preset time, Tsa and Tset are compared again. If Tsa is still less than Tset, the opening of the electronic expansion valve 15 is increased. The increase in the opening of the electronic expansion valve 15 can increase the evaporation temperature, thereby increasing the supply air temperature Tsa. After the opening is increased, after the first preset time, Tsa and Tset are compared again. If Tsa is still less than Tset, the cycle returns to controlling the compressor frequency reduction.

[0136] [Air conditioning heating mode]

[0137] The fresh air humidifier is started, and the supply fan 210 and the exhaust fan 220 are controlled to start at the preset default wind speed. The air conditioning heating mode and the set temperature Tset input by the user are received, and the compressor is controlled to start at the default frequency. The first auxiliary valve switch 171 and the second auxiliary switch 181 are in the disconnected state, the four-way valve operates in the second state, and the ventilation switching device operates in the first state.

[0138] Temperature adjustment steps: Compare the supply air temperature Tsa and the user set temperature Tset. If they are equal, no change is required.

[0139] If Tsa>Tset, it means that the air supply temperature is higher than the temperature expected by the user, and the fresh air humidifier can reduce the heating intensity, then the compressor is controlled to reduce the frequency, and the compressor can be reduced according to the first preset reduction. The compressor frequency reduction can reduce the heating effect, so that the air supply temperature Tsa is reduced; after the frequency reduction, after the first preset time, Tsa and Tset are compared again. If Tsa is still greater than Tset, the opening of the electronic expansion valve 15 is increased. The increase in the opening of the electronic expansion valve 15 can reduce the condensation temperature, thereby reducing the air supply temperature Tsa; after the opening is increased, after the first preset time, Tsa and Tset are compared again. If Tsa is still greater than Tset, the cycle returns to controlling the compressor frequency reduction.

[0140] If Tsa<Tset, it means that the supply air temperature is lower than the temperature expected by the user, and the fresh air humidifier can increase the heating power, then the compressor frequency is controlled to increase, and the compressor can be increased according to the first preset increment. The compressor frequency increase can improve the heating effect, so that the supply air temperature Tsa increases; after the frequency increase, after the first preset time, Tsa and Tset are compared again. If Tsa is still less than Tset, the opening of the electronic expansion valve 15 is reduced. The opening of the electronic expansion valve 15 is reduced, which can increase the condensation temperature, thereby increasing the supply air temperature Tsa. After the opening is reduced, after the first preset time, Tsa and Tset are compared again. If Tsa is still less than Tset, it loops back to controlling the compressor frequency increase.

[0141] In some embodiments, the air conditioning cooling mode and the air conditioning heating mode can be combined into the air conditioning mode. When the user uses the fresh air humidifier, he directly selects the air conditioning mode, and then the fresh air humidifier automatically determines whether to enter cooling or heating.

[0142] When the user feels that the indoor air humidity does not need to be adjusted and hopes to adjust the fresh air temperature, the air conditioning mode can be selected.

[0143] The fresh air humidifier is started, and the supply fan 210 and the exhaust fan 220 are controlled to start at the preset default wind speed. The air-conditioning mode and set temperature Tset input by the user are received, and the compressor is controlled to start at the default frequency. The first auxiliary valve switch 171 and the second auxiliary switch 181 are in the disconnected state.

[0144] Judgment steps for entering cooling or heating: compare the set temperature Tset with the indoor and outdoor temperatures. When the set temperature is lower than the indoor air temperature Tra and lower than the outdoor air temperature Toa, that is, Tset<min(Toa, Tra), the air conditioning cooling mode is automatically entered, and the four-way valve and the ventilation switching device are controlled to operate in the first state; when the set temperature is higher than the indoor air temperature Tra and higher than the outdoor air temperature Toa, that is, Tset>max(Toa, Tra), the air conditioning heating mode is automatically entered, the four-way valve is controlled to operate in the second state, and the ventilation switching device is operated in the first state.

[0145] [Cooling and dehumidifying mode]

[0146] Reference Fig. 9 , the fresh air humidifier is started, the supply fan 210 and the exhaust fan 220 are controlled to start at the preset default wind speed, the refrigeration and dehumidification mode input by the user and the user's set temperature Tset and set humidity dset are received, the compressor is controlled to start at the default frequency, the first auxiliary valve switch 171 and the second auxiliary switch 181 remain in the default disconnected state, the four-way valve and the ventilation switching device first operate in the first state, and then switch the state according to the preset cycle.

[0147] Steps for temperature adjustment: Compare the air supply temperature Tsa with the user set temperature Tset:

[0148] If Tsa>Tset, it means that the air supply temperature is higher than the temperature expected by the user and cooling needs to be strengthened, so the opening of the electronic expansion valve 15 is reduced so that the auxiliary switch controlling the auxiliary evaporator is connected.

[0149] The opening of the electronic expansion valve 15 is reduced, which can lower the evaporation temperature, thereby reducing the supply air temperature Tsa; after the opening is reduced, after a second preset time, Tsa and Tset are compared again. If Tsa is still greater than Tset, the opening of the electronic expansion valve 15 continues to be reduced.

[0150] When the four-way valve 12 is in the first state, the first auxiliary valve switch 171 is connected, so that the first auxiliary heat exchanger 17 is connected in the refrigerant circuit, and the first auxiliary heat exchanger 17 serves as an auxiliary evaporator; when the four-way valve 12 is in the second state, the second auxiliary valve switch 181 is connected, so that the second auxiliary heat exchanger 17 is connected in the refrigerant circuit, and the second auxiliary heat exchanger 18 serves as an auxiliary evaporator. After the outdoor air absorbs moisture through the adsorption unit, the temperature will rise, and then pass through the auxiliary evaporator, which can reduce the supply air temperature Tsa of the outdoor air, thereby further reducing Tsa.

[0151] The states of the first auxiliary valve switch 171 and the second auxiliary valve switch 181 correspond to the states of the four-way valve, that is, the first state of the four-way valve 12 corresponds to the first auxiliary valve switch 171 being connected and the second auxiliary valve switch 181 being disconnected; the second state of the four-way valve 12 corresponds to the second auxiliary valve switch 181 being connected and the first auxiliary valve switch 171 being disconnected.

[0152] According to an embodiment of the present application, when the supply air temperature Tsa needs to be lowered, the auxiliary evaporator is connected in the refrigerant circuit, which can accelerate the speed of lowering the supply air temperature Tsa, make the supply air temperature meet the requirements as soon as possible, and improve the energy efficiency of the unit.

[0153] In addition, since the on and off state of the heat exchanger will not change in the subsequent humidity adjustment step, the auxiliary condenser does not work here because it will divert part of the refrigerant, which will weaken the regeneration heat of the main condenser. The auxiliary condenser remains disconnected and does not work, so that the refrigerant can flow through the main condenser at the condenser, thereby improving the regeneration effect of the main condenser. The adsorbent can absorb moisture better and improve the dehumidification effect.

[0154] If Tsa<Tset, it means that the air supply temperature is lower than the temperature expected by the user, and the fresh air humidifier can reduce the cooling power, then the opening of the electronic expansion valve 15 is increased, and the first auxiliary valve switch 171 and the second auxiliary valve switch 181 remain in the disconnected state. The opening of the electronic expansion valve 15 is increased, which can increase the evaporation temperature, thereby increasing the air supply temperature Tsa. After the opening is increased, after the first preset time, Tsa and Tset are compared again. If Tsa is still less than Tset, the opening of the electronic expansion valve 15 is continued to be increased.

[0155] If Tsa=Tset, the step of judging the indoor exhaust air temperature Tea is entered: judging whether Tea is less than the preset value of heat recovery. If so, the valve switch controlling the auxiliary condenser is disconnected; if not, the valve switch controlling the auxiliary condenser is connected, so that the auxiliary condenser is connected in the refrigerant circuit. The connection of the auxiliary condenser can realize heat recovery, avoid the condenser temperature from being too high, and reduce excessive heat discharge to the outside.

[0156] After the step of determining the indoor exhaust air temperature Tea, the step of humidity adjustment is entered: comparing the supply air humidity dsa with the set humidity dset;

[0157] If dsa=dset, the compressor, electronic expansion valve, and fan do not need to make any changes;

[0158] If dsa>dset, it means that the air supply humidity dsa is relatively high and dehumidification needs to be strengthened, then the compressor frequency is controlled to increase, and the compressor can increase the frequency according to the second preset increment, for example, the second preset increment is 5Hz. The compressor frequency increase can improve the dehumidification effect and reduce the air supply humidity dsa; after the frequency increase, after the second preset time, dsa and dset are compared again, if dsa is still greater than dset, the opening of the electronic expansion valve 15 is reduced; after the opening is reduced, after the second preset time, dsa and dset are compared again, if dsa is still greater than dset, the speed of the supply fan and the exhaust fan is reduced to reduce the air volume, for example, after the fan speed is reduced, the air volume is reduced by 3% each time; after the air volume is reduced, after the second preset time, dsa and dset are compared again, if dsa is still greater than dset, the compressor frequency increase step is cycled.

[0159] If dsa<dset, it means that the supply air humidity dsa is relatively low, and the dehumidification intensity can be reduced, then the compressor is controlled to reduce the frequency, and the compressor can be reduced in frequency according to the second preset reduction, for example, the second preset reduction is 5Hz; after the frequency reduction, after the second preset time, dsa and dset are compared again, if dsa is still less than dset, the opening of the electronic expansion valve 15 is increased; after the opening is increased, after the second preset time, dsa and dset are compared again, if dsa is still less than dset, the speed of the supply fan and the exhaust fan is increased to increase the air volume, for example, after the fan speed is increased, the air volume is increased by 3% each time; after the air volume increases, after the second preset time, dsa and dset are compared again, if dsa is still less than dset, the cycle returns to the step of reducing the frequency of the compressor.

[0160] According to the embodiment of the present application, the frequency of the compressor is adjusted, the opening of the electronic expansion valve is adjusted, and the air volume of the fan is adjusted, and the amplitude of their influence on the supply air humidity dsa gradually decreases. That is to say, adjusting the frequency of the compressor can make the supply air humidity dsa change to a larger extent, while adjusting the opening of the electronic expansion valve can make the supply air humidity dsa change to a smaller extent, and adjusting the air volume of the fan can make the supply air humidity dsa change to the smallest extent. By adjusting the supply air humidity dsa in the order of adjusting the frequency of the compressor, the opening of the electronic expansion valve, and the air volume of the fan, the speed of adjusting the supply air humidity dsa can be increased, while avoiding the problem of energy waste caused by excessive adjustment.

[0161] [Heating and humidification mode]

[0162] The fresh air humidifier is started, and the supply fan 210 and the exhaust fan 220 are controlled to start at the preset default wind speed. The heating and humidification mode input by the user and the user's set temperature Tset and set humidity dset are received, and the compressor is controlled to start at the default frequency. The first auxiliary valve switch 171 and the second auxiliary switch 181 remain in the default disconnected state, the four-way valve first operates in the second state, and the ventilation switching device first operates in the first state, and then the four-way valve and the ventilation switching device switch states according to the preset cycle.

[0163] Steps to enter temperature adjustment: compare the air supply temperature Tsa with the user set temperature Tset;

[0164] If Tsa>Tset, it means that the air supply temperature is higher than the temperature expected by the user, and the heating intensity can be reduced, then the opening of the electronic expansion valve 15 is increased to reduce the air supply temperature Tsa. After the opening is increased, after a second preset time, Tsa and Tset are compared again. If Tsa is still greater than Tset, the opening of the electronic expansion valve 15 is further increased.

[0165] If Tsa<Tset, it means that the supply air temperature is lower than the temperature expected by the user, and the fresh air humidifier can speed up heating. Then, the opening of the electronic expansion valve 15 is reduced, and the valve switch of the auxiliary condensation is controlled to be connected so that the auxiliary condenser is connected in the refrigerant circuit.

[0166] The opening of the electronic expansion valve 15 is reduced, so that the air supply temperature Tsa increases. After the opening is reduced, after a second preset time, Tsa and Tset are compared again. If Tsa is still less than Tset, the opening of the electronic expansion valve 15 is further reduced.

[0167] The operation of the auxiliary condenser extends the heat exchange path and heat exchange time of the outdoor air, increases the speed at which the supply air temperature rises, and allows the supply air temperature to quickly meet the requirements.

[0168] If Tsa = Tset, then enter the humidity adjustment step: compare the supply air humidity dsa with the set humidity dset:

[0169] If dsa=dset, the compressor, electronic expansion valve, and fan do not need to make any changes;

[0170] If dsa>dset, it means that the air supply humidity dsa is relatively high, and the humidification intensity can be reduced, then the compressor is controlled to reduce the frequency, and the compressor can be reduced according to the second preset reduction, for example, the second preset reduction is 5Hz. The compressor reduces the frequency, so that the air supply humidity dsa is reduced; after the frequency reduction, after the second preset time, dsa and dset are compared again, if dsa is still greater than dset, the opening of the electronic expansion valve 15 is increased; after the opening is increased, after the second preset time, dsa and dset are compared again, if dsa is still greater than dset, the speed of the supply fan and the exhaust fan is increased to increase the air volume, for example, after the fan speed is increased, the air volume is increased by 3% each time; after the air volume is increased, after the second preset time, dsa and dset are compared again, if dsa is still greater than dset, the step of reducing the frequency of the compressor is cycled.

[0171] If dsa<dset, it means that the supply air humidity dsa is relatively low, and the humidification intensity can be increased, then the compressor is controlled to increase the frequency, and the compressor can be increased in frequency according to the second preset increment, for example, the second preset increment is 5Hz; after the frequency increase, after the second preset time, dsa and dset are compared again, if dsa is still less than dset, the opening of the electronic expansion valve 15 is reduced; after the opening is reduced, after the second preset time, dsa and dset are compared again, if dsa is still less than dset, the speed of the supply fan and the exhaust fan is reduced to reduce the air volume, for example, after the fan speed is reduced, the air volume is reduced by 3% each time; after the air volume is reduced, after the second preset time, dsa and dset are compared again, if dsa is still less than dset, the cycle is returned to the step of increasing the frequency of the compressor.

[0172] In some embodiments of the present application, the cooling and dehumidification modes and the heating and humidification modes can be combined into a humidity control mode. When the user selects the humidity control mode, the fresh air humidifier can automatically determine whether to enter cooling and dehumidification or heating and humidification according to the temperature and humidity.

[0173] Specifically, after entering the humidity control mode, the following steps are performed to determine whether to cool and dehumidify or heat and humidify:

[0174] When the set temperature Tset is lower than the indoor and outdoor air temperature, or

[0175] When the set temperature Tset is between the indoor and outdoor air temperatures and the absolute value of the indoor and outdoor air temperature difference is less than the first preset temperature tolerance value ΔT1 and the set humidity dset is less than the indoor and outdoor air humidity, the cooling and dehumidification mode is entered.

[0176] That is to say, when any of the following conditions is met, the cooling and dehumidification mode is entered:

[0177] Condition 1: Tset<min(Toa, Tra);

[0178] Condition 2: Tset∈[min(Toa, Tra), max(Toa, Tra)]&|Toa-Tra|<ΔT1&dset<min(doa, dra).

[0179] When the set temperature Tset is greater than the temperature of the indoor and outdoor air, or

[0180] When the set temperature Tset is between the indoor and outdoor air temperatures and the absolute value of the indoor and outdoor air temperature difference is less than the first preset temperature tolerance value ΔT1 and the set humidity dset is greater than the indoor and outdoor air humidity, the heating and humidification mode is entered.

[0181] That is to say, when any of the following conditions is met, the heating and humidification mode is entered:

[0182] Condition 1: Tset>max(Toa, Tra);

[0183] Condition 2: Tset∈[min(Toa, Tra), max(Toa, Tra)]&|Toa-Tra|<ΔT1&dset>max(doa, dra).

[0184] In the present application, if the set temperature Tset is lower than the temperature of the indoor and outdoor air, it means that the ambient temperature is relatively high, and cooling and dehumidification are performed; if the set temperature Tset is higher than the indoor and outdoor air temperature, it means that the ambient temperature is relatively low, and heating and humidification are performed; if the temperature difference between indoor and outdoor is not large, and the set temperature is between the indoor and outdoor temperature difference, it means that the ambient temperature is relatively comfortable. At this time, the working mode is determined according to the humidity: if the set humidity dset is lower than the humidity of the indoor and outdoor air, it means that the ambient humidity is relatively high, and cooling and dehumidification are performed; if the set humidity dset is higher than the indoor and outdoor air humidity, it means that the ambient humidity is relatively low, and heating and humidification are performed.

[0185] In some embodiments of the present application, reference Fig.10 The fresh air humidifier has an automatic mode. When the user selects the automatic mode, the fresh air humidifier can automatically determine the working mode to enter based on the temperature and humidity.

[0186] Specifically, after entering the automatic mode, when the set humidity dset is between the humidity of the indoor and outdoor air, and the absolute value of the indoor and outdoor humidity difference is less than the preset humidity tolerance value Δd, and the set temperature Tset is between the temperature of the indoor and outdoor air, and the absolute value of the indoor and outdoor temperature difference is less than the first preset temperature tolerance value ΔT1, then enter the full heat exchange mode;

[0187] That is to say, dset∈[min(doa, dra), max(doa, dra)]&|doa-dra|<Δd&Tset∈[min(Toa, Tra), max(Toa, Tra)]&|Toa-Tra|<ΔT1. Under this condition, the temperature and humidity of the environment are relatively comfortable and there is no need to adjust the temperature and humidity.

[0188] When the set humidity dset is between the humidity of the indoor and outdoor air, and the absolute value of the difference between the indoor and outdoor humidity is less than the preset humidity tolerance value, and the set temperature Tset is not between the indoor and outdoor temperatures, the air conditioning mode is entered.

[0189] That is to say, dset∈[min(doa, dra), max(doa, dra)]&|doa-dra|<Δd&[Tset<[min(Toa, Tra)|Tset>max(Toa, Tra)]. Under this condition, it means that the ambient humidity is relatively comfortable and only the temperature needs to be adjusted, then the air-conditioning mode is entered.

[0190] Specifically, when dset∈[min(doa, dra), max(doa, dra)]&|doa-dra|<Δd&Tset<[min(Toa, Tra)], the air-conditioning cooling mode in the air-conditioning mode is entered; when dset∈[min(doa, dra),max(doa, dra)]&|doa-dra|<Δd&Tset>[max(Toa, Tra)], the air-conditioning heating mode in the air-conditioning mode is entered.

[0191] When the set humidity dset is less than the indoor and outdoor air humidity or the set humidity dset is greater than the indoor and outdoor air humidity, that is, dset<min(doa, dra)|dset>max(doa, dra), the humidity adjustment mode is entered.

[0192] The present application also provides another embodiment, in which reference is made to Figure 6 In the refrigerant circuit, the branch where the first main heat exchanger 13 is located is connected in series with the first main valve switch 131, and the branch where the second main heat exchanger 14 is located is connected in series with the second main valve switch 141.

[0193] When the first main valve switch 131 is connected, the first main heat exchanger 13 is connected in the refrigerant circuit, and when the first main valve switch 131 is disconnected, the first main heat exchanger 13 is not connected in the refrigerant circuit. When the second main valve switch 141 is connected, the second main heat exchanger 14 is connected in the refrigerant circuit, and when the second main valve switch 141 is disconnected, the second main heat exchanger 14 is not connected in the refrigerant circuit.

[0194] Therefore, the fresh air humidifier can make the first main heat exchanger 13 work or not work by controlling the state of the first main valve switch 131, and make the second main heat exchanger 14 work or not work by controlling the state of the second main valve switch 141.

[0195] The following describes the differences between the control of the fresh air humidifier in this embodiment and the above embodiment:

[0196] [Air conditioning mode]

[0197] Reference Fig.11 , the user inputs the air-conditioning mode or the fresh air humidifier automatically enters the air-conditioning mode, the supply fan and the exhaust fan start at the default wind speed, the compressor starts, the first main valve switch 141 and the second main valve switch 142 are connected, and the on-off control step of the heat exchanger is entered: determine whether the absolute value of the indoor and outdoor temperature difference is greater than the second temperature tolerance value ΔT2, that is, determine whether |Toa-Tra|>ΔT2. If not, it means that the indoor and outdoor temperature difference is relatively small and the sensible heat load is relatively low, then the first main valve switch 141 and the second main valve switch 142 are disconnected, the first auxiliary valve switch 171 and the second auxiliary valve switch 181 are connected, the auxiliary heat exchanger works, and the main heat exchanger does not work.

[0198] Since the sensible heat load in the environment is relatively low and the heat exchange area of ​​the auxiliary heat exchanger is smaller than that of the main heat exchanger, only the auxiliary heat exchanger works and can operate at a low load, which can avoid energy waste compared to the operation of the main heat exchanger.

[0199] Specifically, in the air flow direction, the thickness of the auxiliary heat exchanger is smaller than that of the main heat exchanger, and the path of air passing through the auxiliary heat exchanger is shorter than that of the main heat exchanger.

[0200] If |Toa-Tra|>ΔT2 is established, then continue to determine whether the absolute value of the indoor and outdoor temperature difference is greater than the third temperature tolerance value ΔT3, that is, |Toa-Tra|>ΔT3. If not, keep the first main valve switch 141 and the second main valve switch 142 connected, and the first auxiliary valve switch 171 and the second auxiliary valve switch 181 disconnected. If so, the first main valve switch 141, the second main valve switch 142, the first auxiliary valve switch 171, and the second auxiliary valve switch 181 are connected.

[0201] In this embodiment, when ΔT3>ΔT2 and ΔT2<|Toa-Tra|<ΔT3, the main valve switch is connected and the auxiliary valve switch is disconnected. That is to say, under this temperature condition, the heat load is centered and the temperature can be met by adjusting the main heat exchanger. If only the auxiliary heat exchanger works, it will take a long time to meet the temperature conditions.

[0202] When |Toa-Tra|>ΔT3, the main valve switch and the auxiliary valve switch are both connected. Under this temperature condition, the heat load is relatively large, and both the main heat exchanger and the auxiliary heat exchanger are working, which can make the time and path for air to pass through the heat exchanger the longest, so that the temperature can be adjusted quickly.

[0203] For example, ΔT1=6°C, ΔT2=10°C, and ΔT3=15°C. When the difference between indoor and outdoor temperatures is less than 6°C, the temperature is more suitable; when the difference between indoor and outdoor temperatures is between 6°C and 10°C, the heat load is relatively low; when the difference between indoor and outdoor temperatures is between 10°C and 15°C, the heat load is not too large; when the difference between indoor and outdoor temperatures is greater than 15°C, the heat load is relatively large.

[0204] Compared with the previous embodiment, regardless of the size of the heat load, the main heat exchanger is the one that works. In this embodiment, when the heat load is small, the auxiliary heat exchanger performs small load operation to avoid energy waste. When the heat load is large, the main heat exchanger and the auxiliary heat exchanger work simultaneously to increase the speed of temperature regulation. Therefore, the regulation of this embodiment is more refined, which can achieve the purpose of energy saving and rapid regulation.

[0205] After the on-off control step of the heat exchanger is completed, the cooling and heating judgment step is performed.

[0206] In some embodiments, if the user inputs the air conditioning cooling mode when starting the fresh air humidifier, the on-off control step of the heat exchanger is performed in the air conditioning cooling mode; if the user inputs the air conditioning heating mode when starting the fresh air humidifier, the on-off control step of the heat exchanger is performed in the air conditioning heating mode.

[0207] [Humidity Control Mode]

[0208] Reference Fig.12 and Fig.13 After the fresh air humidifier enters the humidity control mode, before performing the temperature adjustment step, it is determined whether the absolute value of the difference between the indoor and outdoor temperatures is less than the first preset temperature tolerance ΔT1. If not, the temperature adjustment step is performed.

[0209] If it is, that is, |Toa-Tra|<ΔT1, it means that the indoor and outdoor temperature difference is not large and the heat load is relatively small, then the compressor frequency is reduced, so that the first main valve switch 131 and the second main valve switch 141 are disconnected, and the first auxiliary valve switch 171 and the second auxiliary valve switch 181 are connected.

[0210] The heat load is relatively small, and the low-frequency operation of the compressor can meet the purpose of temperature regulation, avoiding the problem of energy waste during high-frequency operation; only the auxiliary heat exchanger works at a low load, which can save energy and avoid the problem of low efficiency of the main heat exchanger during operation, which may cause excessive suction superheat.

[0211] After the first main valve switch 131 and the second main valve switch 141 are disconnected and the first auxiliary valve switch 171 and the second auxiliary valve switch 181 are connected, the air supply temperature Tsa is compared with the set temperature Tset:

[0212] If Tsa=Tset, the humidity adjustment step is entered.

[0213] In the cooling and dehumidification mode, if Tsa>Tset, the opening of the electronic expansion valve is reduced; if Tsa<Tset, the opening of the electronic expansion valve is increased.

[0214] In the heating and humidifying mode, if Tsa>Tset, the opening of the electronic expansion valve is increased; if Tsa<Tset, the opening of the electronic expansion valve is decreased.

[0215] In the present application, the heat absorption and heat release of the adsorption unit can be utilized by the auxiliary heat exchanger at the rear side thereof, thereby improving the energy efficiency of the unit.

[0216] In the present application, in the humidity control mode, when the ambient heat load is relatively small and the ambient temperature is relatively close to the comfort zone, only the auxiliary heat exchanger operates at a low load, which can save energy and avoid the problem of low efficiency of the main heat exchanger during operation, which may cause excessive intake superheat.

[0217] In the present application, in the air-conditioning mode, when the ambient heat load is relatively small, only the auxiliary heat exchanger operates; when the heat load is moderate, the main heat exchanger operates; when the heat load is large, the main heat exchanger and the auxiliary heat exchanger operate simultaneously, thereby achieving rapid temperature adjustment while avoiding energy waste.

[0218] In the present application, in the cooling and dehumidification mode, when the exhaust air temperature meets the preset value, the auxiliary condenser is operated to achieve the purpose of recovering the heat of the indoor air.

[0219] In this application, the fresh air humidifier subdivides the environmental conditions and sets a variety of working modes accordingly, which can improve the energy efficiency of the system and ensure that the fresh air heat and humidity load is in a comfortable range.

[0220] In the present application, the fresh air humidifier has an air conditioning mode that controls only according to temperature when the humidity is comfortable, and a humidity control mode that controls according to temperature and humidity, which is more energy-efficient while ensuring the comfort of the fresh air heat and humidity load.

[0221] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0222] For the convenience of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A fresh air humidifier, characterized in that: include: A first adsorption unit and a second adsorption unit have a moisture adsorbent, wherein one of the first adsorption unit and the second adsorption unit is used for adsorbing moisture, and the other is used for regenerating the adsorbent; A ventilation switching device switches the air flowing through the first adsorption unit and the air flowing through the second adsorption unit; A refrigerant circuit, comprising: a compressor, an electronic expansion valve, a four-way valve, a heat exchanger and a valve switch; the valve switch is used to control the connection or disconnection of the heat exchanger in the refrigerant circuit; Wherein, the heat exchanger comprises: A first main heat exchanger, disposed on the windward side of the first adsorption unit; A second main heat exchanger is provided on the windward side of the second adsorption unit, when one of the second main heat exchanger and the first main heat exchanger is used as a main evaporator, the other one is used as a main condenser; a first auxiliary heat exchanger, arranged at the air outlet side of the first adsorption unit, wherein when the first auxiliary heat exchanger is used as an auxiliary evaporator, the first main heat exchanger is used as a main evaporator, and when the first auxiliary heat exchanger is used as an auxiliary condenser, the first main heat exchanger is used as a main condenser; A second auxiliary heat exchanger is provided at the air outlet side of the second adsorption unit, when one of the second auxiliary heat exchanger and the first auxiliary heat exchanger is used as an auxiliary evaporator, the other one is used as an auxiliary condenser; The fresh air humidifier also includes: Outdoor temperature and humidity detection device, used to detect the temperature and humidity of outdoor air; Indoor temperature and humidity detection device, used to detect the temperature and humidity of indoor air; Outdoor air supply temperature and humidity detection device, used to detect the supply temperature and humidity of fresh air; The fresh air humidifier can operate at least one of a cooling and dehumidification mode and a heating and humidification mode; The controller of the fresh air humidifier is used to: when the absolute value of the temperature difference between indoor and outdoor air is not less than the first preset temperature tolerance value: In the cooling and dehumidification mode, when the supply air temperature is higher than the set temperature, the first main heat exchanger, the second main heat exchanger and the auxiliary evaporator are connected; In the heating and humidifying mode, when the supply air temperature is lower than the set temperature, the first main heat exchanger, the second main heat exchanger and the auxiliary condenser are connected.

2. The fresh air humidifier according to claim 1, characterized in that: The heat exchange area of ​​the first auxiliary heat exchanger is smaller than that of the first main heat exchanger, and the heat exchange area of ​​the second auxiliary heat exchanger is smaller than that of the second main heat exchanger; The controller is used to: when the absolute value of the indoor and outdoor air temperature difference is less than the first preset temperature tolerance value, perform the heat exchanger on-off control step: connect the first auxiliary heat exchanger and the second auxiliary heat exchanger, and disconnect the first main heat exchanger and the second main heat exchanger.

3. The fresh air humidifier according to claim 2, characterized in that: The controller is used to: When the absolute value of the indoor and outdoor air temperature difference is less than the first preset temperature tolerance value, the compressor is controlled to reduce the frequency.

4. The fresh air humidifier according to claim 2, characterized in that: The controller is used to: After the control step of switching the heat exchanger on and off, compare the supply air temperature with the set temperature: In the cooling and dehumidification mode, when the supply air temperature is higher than the set temperature, the opening of the electronic expansion valve is reduced; when the supply air temperature is lower than the set temperature, the opening of the electronic expansion valve is increased; In the heating and humidification mode, when the supply air temperature is higher than the set temperature, the opening of the electronic expansion valve is increased; when the supply air temperature is lower than the set temperature, the opening of the electronic expansion valve is reduced.

5. The fresh air humidity control machine according to claim 1, characterized in that: The controller is used to: In the cooling and dehumidification mode, when the supply air temperature is equal to the set temperature, it is determined whether the exhaust air temperature is less than the heat recovery preset value. If not, the auxiliary condenser is connected.

6. The fresh air humidifier according to claim 1, characterized in that: The controller is used to: When the supply air temperature is equal to the set temperature, it is determined whether the supply air humidity is equal to the set humidity. If not, the frequency of the compressor is adjusted; If the air supply humidity is still not equal to the set humidity after adjusting the compressor frequency, adjust the opening of the electronic expansion valve; If the supply air humidity is still not equal to the set humidity after adjusting the opening of the electronic expansion valve, adjust the supply air volume.

7. The fresh air humidity control machine according to claim 1, characterized in that: The controller is used to: In the air conditioning mode, when the absolute value of the indoor and outdoor air temperature difference is not greater than the second preset temperature tolerance value, the first auxiliary heat exchanger and the second auxiliary heat exchanger are connected, and the first main heat exchanger and the second main heat exchanger are disconnected; When the absolute value of the indoor and outdoor air temperature difference is greater than the third preset temperature tolerance value, the first main heat exchanger, the second main heat exchanger, the first auxiliary heat exchanger, and the second auxiliary heat exchanger are all connected; When the absolute value of the indoor and outdoor air temperature difference is greater than the second preset temperature tolerance value and not greater than the third preset temperature tolerance value, the first main heat exchanger and the second main heat exchanger are connected, and the first auxiliary heat exchanger and the second auxiliary heat exchanger are disconnected.

8. The fresh air humidity control machine according to claim 1, characterized in that: The controller is used to: In the automatic mode, when the set humidity is within the closed interval formed by the outdoor air humidity and the indoor air humidity and the absolute value of the indoor and outdoor air humidity difference is less than the preset humidity tolerance value, and the set temperature is within the closed interval formed by the outdoor air temperature and the indoor air temperature and the absolute value of the indoor and outdoor air temperature difference is less than the first preset temperature tolerance value, the full heat exchange mode is operated; When the set humidity is within the closed interval formed by the outdoor air humidity and the indoor air humidity and the absolute value of the indoor and outdoor air humidity difference is less than the preset humidity tolerance value, and the set temperature is not within the closed interval formed by the outdoor air temperature and the indoor air temperature, the air conditioning mode is operated; When the set humidity is not within the closed interval formed by the outdoor air humidity and the indoor air humidity, the humidity control mode is operated.

9. The fresh air humidity control machine according to claim 8, characterized in that: In the humidity control mode, when the set temperature is within the closed interval formed by the outdoor air temperature and the indoor air temperature and the absolute value of the indoor and outdoor air temperature difference is less than the first preset temperature tolerance value, and the indoor and outdoor air humidity is greater than the set humidity, the cooling and dehumidification mode is operated; When the set temperature is within the closed interval formed by the outdoor air temperature and the indoor air temperature and the absolute value of the indoor and outdoor air temperature difference is less than the first preset temperature tolerance value, and the indoor and outdoor air humidity is less than the set humidity, the heating and humidification mode is operated.

10. A control method for a fresh air humidity control machine, characterized in that: The fresh air humidifier comprises: A first adsorption unit and a second adsorption unit have a moisture adsorbent, wherein one of the first adsorption unit and the second adsorption unit is used for adsorbing moisture, and the other is used for regenerating the adsorbent; A ventilation switching device switches the air flowing through the first adsorption unit and the air flowing through the second adsorption unit; Refrigerant circuit, including: compressor, electronic expansion valve and four-way valve; A first main heat exchanger, disposed on the windward side of the first adsorption unit; A second main heat exchanger is provided on the windward side of the second adsorption unit, when one of the second main heat exchanger and the first main heat exchanger is used as a main evaporator, the other one is used as a main condenser; a first auxiliary heat exchanger, arranged at the air outlet side of the first adsorption unit, wherein when the first auxiliary heat exchanger is used as an auxiliary evaporator, the first main heat exchanger is used as a main evaporator, and when the first auxiliary heat exchanger is used as an auxiliary condenser, the first main heat exchanger is used as a main condenser; A second auxiliary heat exchanger is provided at the air outlet side of the second adsorption unit, when one of the second auxiliary heat exchanger and the first auxiliary heat exchanger is used as an auxiliary evaporator, the other one is used as an auxiliary condenser; The fresh air humidifier can operate at least one of a cooling and dehumidification mode and a heating and humidification mode; The control method comprises: Get indoor and outdoor air temperatures and fresh air supply temperature; When the absolute value of the indoor and outdoor air temperature difference is not less than the first preset temperature tolerance value: In the cooling and dehumidification mode, when the supply air temperature is higher than the set temperature, the first main heat exchanger, the second main heat exchanger and the auxiliary evaporator are connected; In the heating and humidifying mode, when the supply air temperature is lower than the set temperature, the first main heat exchanger, the second main heat exchanger and the auxiliary condenser are connected.

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