A full-function air handling unit and control method thereof

Abstract

The present invention mainly relates to the technical field of air handling machines. In order to solve the problem that the current fresh air air conditioner has few functions and is difficult to meet the different needs of various application scenarios, a full-function air handling machine and a control method thereof are provided, a through-damper is set between the fresh air duct and the return air duct, and the opening and closing and the opening and closing degree of the fresh air inlet, the return air outlet and the through-damper are controlled to make the air handling machine operate in different modes to meet the diverse needs of different users under different usage conditions.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of air handling machines, and in particular to a full-function air handling machine and a control method thereof. Background Art

[0002] The dehumidification principle of fresh air air conditioners is to lower the outdoor air temperature and then dehumidify it, and then continuously introduce the low-humidity, dry outdoor air into the room, and at the same time discharge the high-humidity indoor air, so that the indoor air is replaced as a whole, that is, dehumidification is achieved while introducing fresh air. However, at present, household fresh air air conditioners have few functions, usually only have a single function or partial functions, poor applicability, and it is difficult to meet the different needs of various application scenarios. Summary of the invention

[0003] The technical problems to be solved by the present invention are:

[0004] A full-function air handling unit and a control method thereof are provided to solve the problem that the current fresh air air conditioner has few functions and is difficult to meet the different needs of various application scenarios. Different usage modes are provided for different users in different usage scenarios to meet the usage needs of various application scenarios.

[0005] The technical solution adopted by the present invention to solve the above technical problems is as follows:

[0006] A full-function air handling unit comprises a controller, a throttling device, a rotary motor, a compressor, a four-way valve and an outer shell;

[0007] The interior of the outer shell is divided into a fresh air channel and a return air channel by a partition;

[0008] A fresh air outlet is arranged at one end of the fresh air passage connected to the indoor room, a fresh air inlet is arranged at the end opposite to the fresh air outlet, a first air door is arranged at the fresh air inlet, and a first fan, a first heat exchange component and a purification component are arranged in the fresh air passage;

[0009] A return air inlet is arranged at one end of the return air duct connected to the indoor room, a return air outlet is arranged at the end opposite to the return air inlet, a second air door is arranged at the return air outlet, and a second fan and a second heat exchange component are arranged in the return air duct;

[0010] The first heat exchange component and the second heat exchange component are connected to the compressor through a four-way valve;

[0011] A through-ventilation opening that runs through the fresh air passage and the return air passage is provided on a section of the barrier member close to the fresh air inlet and the return air outlet, and a third air door is provided at the through-ventilation opening.

[0012] Furthermore, the first damper, the second damper and the third damper are electrically controlled air guide louvers.

[0013] Furthermore, it also includes a dehumidification wheel and a first electric heating component. Half of the operating area of ​​the dehumidification wheel is arranged in the fresh air channel, and the other half is arranged in the return air channel. The half arranged in the fresh air channel is located between the first heat exchange component and the fresh air exhaust port, and the half arranged in the return air channel is located between the return air inlet and the second heat exchange component. The first electric heating component is arranged between the return air inlet and the dehumidification wheel.

[0014] Furthermore, an air supply port is provided on the return air duct shell, and the position of the air supply port on the shell is between the first electric heating component and the return air inlet. A rotatable fourth air gate is provided at the air supply port, and the fourth air gate rotates to close the return air duct or the air supply port.

[0015] Furthermore, it also includes a second electric heating component, the first heat exchange component and the second heat exchange component are heat recovery wheels, and the second electric heating component is arranged between the heat recovery wheel and the dehumidification wheel in the fresh air channel.

[0016] Furthermore, the purification component of the fresh air channel is a multi-stage extraction purification component.

[0017] Furthermore, it also includes a temperature and humidity detection module and an air quality detection module, and the temperature and humidity detection module and the air quality detection module are connected to the controller.

[0018] Furthermore, an exhaust port is provided on the shell of the fresh air channel, and the position of the exhaust port on the shell is between the first fan and the fresh air exhaust port. A rotatable fifth damper is provided at the exhaust port, and the fifth damper rotates to close the fresh air channel or the exhaust port.

[0019] Based on the full-function air handling machine control method of the full-function air handling machine, the user controls the start and stop and the opening angle of the first damper, the second damper and the third damper of the air handling machine through the control terminal, and the start and stop of the heat exchange component to switch among the six operation modes of no fresh air purification mode, fresh air purification mode, partial fresh air purification mode, no fresh air dehumidification mode, fresh air dehumidification mode and partial fresh air dehumidification mode;

[0020] The fresh air exhaust vent and the return air inlet are open, the fresh air inlet and the return air exhaust vent are closed, the through-ventilation vent is open, the first fan is turned on, the second fan is turned off, and the heat exchange component is not started; the air handling unit operates in the non-fresh air purification mode, and the indoor air enters the fresh air duct from the return air inlet through the purification component and returns to the room from the fresh air duct exhaust vent;

[0021] The fresh air exhaust vent and the return air inlet are open, the fresh air inlet and the return air exhaust vent are open, the through-air vent is closed, the first fan is turned on, and the heat exchange component is not started; the air handling unit operates in the fresh air purification mode; the outdoor air enters the room from the fresh air inlet and is discharged from the return air exhaust vent;

[0022] The fresh air exhaust vent and the return air inlet are open, the fresh air inlet and the return air exhaust vent are open, the opening of the third door is used to control the mixing amount of fresh air and return air in the through-air vent, the first fan is turned on, the second fan is turned on, and the heat exchange component is not started; the air handling unit operates in a partial fresh air purification mode, and the return air discharged from the return air channel and the fresh air drawn into the fresh air channel are mixed through the through-air vent and then introduced into the room;

[0023] The fresh air exhaust port and the return air inlet are opened, the fresh air inlet and the return air exhaust port are closed, the through-ventilation port is opened, the first fan is turned on, the second fan is turned off, and the heat exchange component is started; the air handling unit operates in a no-fresh air dehumidification mode, and the indoor air enters the fresh air channel from the return air inlet through the through-ventilation port, and is discharged into the room after being dehumidified by the first heat exchange component;

[0024] The fresh air outlet and the return air inlet are opened, the fresh air inlet and the return air outlet are opened, the through-air outlet is closed, the first fan is turned on, the second fan is turned on, and the heat exchange component is started; the air handling unit operates in the fresh air dehumidification mode, and the outdoor air enters from the fresh air outlet and is dehumidified by the dehumidification component before entering the room;

[0025] The fresh air inlet is opened, the return air outlet is completely closed or closed at a set angle, the third damper is opened, the first fan is turned on, and the second fan is turned on; the air handling unit operates in partial fresh air dehumidification mode, and the indoor air enters from the return air inlet, is heated by the second heat exchange component, enters the fresh air channel from the through air outlet and mixes with the outdoor fresh air to achieve cooling.

[0026] Furthermore, it also includes a heating-fresh air heating-waterless dehumidification mode. The fresh air inlet and the return air exhaust port are opened, the first heat exchange component is turned on, and the dehumidification wheel is turned on. The outdoor fresh air passes through the first heat exchange component and the dehumidification wheel regeneration area to complete the fresh air heating and waterless humidification. The fourth air door is rotated to close the return air channel, and the supply air port is opened. The outdoor air is introduced from the supply air port, passes through the dehumidification wheel treatment area for moisture adsorption, and is discharged from the return air exhaust port after heat exchange by the second heat exchange component.

[0027] Furthermore, it also includes a cooling-multi-stage dehumidification mode, the fresh air inlet and the return air exhaust outlet are opened, the through air vent is closed, the first fan is turned on, the second fan is turned on, the first heat exchange component is turned on, the dehumidification wheel is turned on, the first electric heating component is turned on, and the second heat exchange component is turned on; the outdoor fresh air enters the fresh air channel from the fresh air inlet, is dehumidified by the first heat exchange component, and then passes through the dehumidification wheel for auxiliary dehumidification, the first electric heating component heats the return air, and after the dehumidification wheel desorbs moisture, the return air passes through the second heat exchange component and is discharged from the return air exhaust outlet.

[0028] Furthermore, it also includes a micro positive pressure mode. When the air handling unit is in a sealed room, the through air vents are closed, and the controller controls the speed difference between the first fan and the second fan so that the amount of fresh air entering the room is greater than the exhaust air volume, and the indoor air is discharged from the gaps in the room.

[0029] Furthermore, when the refrigerant in the air handling unit leaks, if the system determines that the second heat exchanger in the return air duct has a refrigerant leak, the steps of controlling the leaked refrigerant to be emptied are as follows:

[0030] Step S1, controlling the fifth damper to rotate and close the exhaust port of the fresh air channel, and the exhaust port is opened;

[0031] Step S2, the fourth damper closes the return air inlet of the return air channel, and the supply air outlet is opened;

[0032] Step S3, close the first damper and the second damper, and fully open the third damper;

[0033] Step S4, turning on the first fan, increasing the rotation speed of the first fan, and discharging the leaked refrigerant from the exhaust port;

[0034] If the system cannot determine whether the refrigerant leakage occurs in the first heat exchanger or the second heat exchanger, the steps to control the leakage of refrigerant are as follows:

[0035] Step S1, control the fifth damper to rotate and close the exhaust port of the fresh air channel, and open the exhaust port;

[0036] Step S2, the fourth damper closes the return air inlet of the return air channel, and the supply air outlet is opened;

[0037] Step S3, fully open the first damper and the second damper, and close the third damper;

[0038] Step S4, turning on the first fan and the second fan, and increasing the rotation speeds of the first fan and the second fan to discharge the leaked refrigerant from the exhaust port.

[0039] Further, the system changes the operation mode of the air handling unit according to the indoor humidity Φir, outdoor humidity Φor, indoor temperature Tir and outdoor temperature Tor detected by the temperature and humidity detection module to improve the indoor air quality, specifically including the following steps:

[0040] S1: The user sets the indoor humidity Φs and enters step S2; wherein ΦA>Φs>ΦB, ΦA is the set upper humidity limit, and ΦB is the set lower temperature limit;

[0041] S2: When the system detects that Φir>ΦA, the air handling unit starts the no-fresh air dehumidification mode until Φir reaches the set humidity Φs, maintains the set humidity Φs and enters step S3;

[0042] S3: Compare the indoor and outdoor temperature and humidity values ​​and control the air handling unit to enter different operation modes;

[0043] S31: When Φor<Φir, and Tor<Ta, Ta is the first threshold of outdoor temperature, the air handling unit operates in the fresh air purification mode;

[0044] S32: when Φor>Φir, the heat exchange component is activated to dehumidify the outdoor fresh air and then introduce the fresh air into the room;

[0045] S321: When Tor<Tb, and Φor<Φc, Tb is the second threshold of outdoor temperature, the air handling unit operates in the fresh air dehumidification mode;

[0046] S322: When Tor>Tb, and Φor>Φc, the air handling unit operates in a partial fresh air dehumidification mode;

[0047] S3221: When the air handling unit operates in partial fresh air dehumidification mode, when the speed of the first fan or the second fan is constant, the system dynamically controls the opening of the third damper according to the outdoor temperature Tor, outdoor humidity Φor and indoor air parameters detected by the air quality detection module, and controls the mixing amount of return air and high-temperature fresh air.

[0048] Furthermore, the system changes the operation mode of the air handling unit according to the indoor and outdoor CO2 concentration and PM2.5 concentration detected by the air quality detection module to improve the indoor air quality, which specifically includes the following steps:

[0049] S1. Determine the cleanliness level of indoor air according to the indoor carbon dioxide concentration and PM2.5 concentration. If Cir-CO2 is less than the first threshold of indoor carbon dioxide concentration and Cir-PM2.5 concentration is less than the first threshold of indoor PM2.5 concentration, proceed to step S11.

[0050] If Cir-CO2 is greater than or equal to the first threshold of indoor carbon dioxide concentration, and Cir-PM2.5 is greater than the second threshold of indoor PM2.5 concentration, proceed to step S12;

[0051] If Cir-CO2 is greater than or equal to the second threshold of indoor carbon dioxide concentration, and Cir-PM2.5 is greater than the third threshold of indoor PM2.5 concentration, proceed to step S13;

[0052] S11: Cor-CO2>1.1*Cir-CO2, and Cor-PM2.5 is greater than or equal to the first threshold of outdoor PM2.5 concentration, the air handling unit turns off the fresh air mode;

[0053] Cor-CO2>1.2*Cir-CO2, and Cor-PM2.5 is greater than or equal to the second threshold of outdoor PM2.5 concentration, fresh air is introduced intermittently;

[0054] Cor-CO2>1.3*Cir-CO2, and Cor-PM2.5 is greater than or equal to the third threshold of outdoor PM2.5 concentration, the air handling unit operates in the no-fresh air purification mode or the no-fresh air dehumidification mode;

[0055] The first threshold of indoor carbon dioxide concentration is less than the second threshold of indoor carbon dioxide concentration;

[0056] The third threshold of indoor PM2.5 concentration> the second threshold of indoor PM2.5 concentration> the first threshold of indoor PM2.5 concentration;

[0057] The third threshold of outdoor PM2.5 concentration>the second threshold of outdoor PM2.5 concentration>the first threshold of outdoor PM2.5 concentration;

[0058] S12: If the air handling unit is in the fresh air purification mode or the fresh air dehumidification mode at this time, the system increases the circulation volume of the indoor fresh air by increasing the rotation speeds of the first fan and the second fan;

[0059] If the air handling unit is running in partial fresh air purification mode or partial fresh air dehumidification mode at this time, the partial fresh air purification mode is adjusted to the fresh air purification mode, and the partial fresh air dehumidification mode is adjusted to the fresh air dehumidification mode;

[0060] If the air handling unit is in the no fresh air purification mode or the no fresh air dehumidification mode, the no fresh air purification mode is adjusted to the partial fresh air purification mode, and the no fresh air dehumidification mode is adjusted to the partial fresh air dehumidification mode;

[0061] S13: The operation mode of the air handling unit is adjusted to the fresh air purification mode, and the rotation speeds of the first fan and the second fan are increased.

[0062] Furthermore, the first threshold value of indoor carbon dioxide concentration is 500 PPM, and the second threshold value of indoor carbon dioxide concentration is 800 PPM;

[0063] The first threshold of indoor PM2.5 concentration is 35 μg / m 3 The second threshold of indoor PM2.5 concentration is 60μg / m 3 The third threshold of indoor PM2.5 concentration is 200 μg / m 3 ;

[0064] The first threshold of outdoor PM2.5 concentration is 30 μg / m 3 The second threshold of outdoor PM2.5 concentration is 50 μg / m 3 The third threshold of outdoor PM2.5 concentration is 100 μg / m 3 .

[0065] Beneficial effects of the present invention:

[0066] The full-function air handling unit described in the present invention is aimed at special application scenarios such as purification and ventilation in spring and autumn, dehumidification and humidification in summer and winter, and further expands the functions of single air purification, full / partial fresh air, fresh air heating, waterless humidification, multi-stage dehumidification, etc., which can better adapt to the usage needs of different customers.

[0067] The heat is directly recovered by exchanging heat with the return air through the second heat exchange component in the return air duct, which can reduce some heat losses in the summer and winter seasons when the indoor temperature difference is large.

[0068] A temperature and humidity detection module is set up to quickly control the indoor temperature and humidity to the optimal state by coordinating the opening and closing of each damper; an air quality detection module is set up, and the air handling unit operates in different modes at different carbon dioxide concentrations and PM2.5 concentrations to make the indoor air reach a suitable state. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Figure 1 Schematic diagram of air flow circulation of the full-function air handling unit in the non-fresh air purification mode described in this embodiment.

[0070] Figure 2 Schematic diagram of air flow circulation in the fresh air purification mode of the full-function air handling unit described in this embodiment.

[0071] Figure 3 This is a schematic diagram of air flow circulation in a partial fresh air purification mode of the full-function air handling unit described in this embodiment.

[0072] Figure 4 Schematic diagram of air flow circulation of the full-function air handling unit in the non-fresh air dehumidification mode described in this embodiment.

[0073] Figure 5 Schematic diagram of air flow circulation in the fresh air dehumidification mode of the full-function air handling unit described in this embodiment.

[0074] Figure 6 This is a schematic diagram of air flow circulation in a partial fresh air dehumidification mode of the full-function air handling unit described in this embodiment.

[0075] Figure 7 This is a schematic diagram of air flow circulation in the refrigeration-multi-stage dehumidification mode of the full-function air handling machine described in this embodiment.

[0076] Figure 8 This is a schematic diagram of air flow circulation in the heating - fresh air heating - waterless humidification mode of the full-function air handling mechanism described in this embodiment.

[0077] Fig. 9 This is a schematic diagram of air flow circulation in the refrigeration-multi-stage dehumidification mode of the full-function air handling machine described in this embodiment.

[0078] Fig.10 This is a schematic diagram of air flow circulation under the full-function air heating-waterless humidification described in this embodiment.

[0079] Fig.11 Schematic diagram of the full-function air refrigerant leakage prevention mode described in this embodiment.

[0080] Fig.12 This is a schematic diagram of preventing refrigerant leakage in the second heat exchange component of a full-function air handling unit described in an embodiment.

[0081] In the attached drawing: 1-fresh air channel, 2-return air channel, 3-fresh air inlet, 4-return air exhaust outlet, 5-first air door, 6-second air door, 7-first heat exchange component, 8-second heat exchange component, 9-first fan, 10-second fan, 11-purification component, 12-compressor, 13-four-way valve, 14-throttling device, 15-rotating motor, 16-air supply port, 17-fourth air door, 18-exhaust port, 19-fifth air door, 20-third air door, 21-first electric heating component, 22-dehumidification wheel, 23-fresh air exhaust port, 24-return air inlet, 25-second electric heating component, 26-heat recovery wheel. DETAILED DESCRIPTION

[0082] The air handling unit includes a controller, a throttling device 14, a rotary motor 15, a compressor 12, a four-way valve 13 and a housing;

[0083] The interior of the shell is divided into a fresh air channel 1 and a return air channel 2 by a partition. The end of the fresh air channel 1 connected to the indoor room is provided with a fresh air exhaust port 23, and the end opposite to the fresh air exhaust port 23 is provided with a fresh air inlet 3. A first fan 9, a first heat exchange component 7 and a purification component 11 are provided in the fresh air channel 1; a return air inlet 24 is provided at one end of the return air channel 2 connected to the indoor room, and a return air exhaust port 4 is provided at the end opposite to the return air inlet 24, a second fan 10 and a second heat exchange component 8 are provided in the return air channel 2, and the first heat exchange component 7 and the second heat exchange component 8 are connected to the compressor 12 through a four-way valve 13; the fresh air inlet 3 is provided with an electrically controlled first damper 5, and the return air exhaust port 4 is provided with an electrically controlled second damper 6, and a third damper 20 is provided on a section of the partition close to the fresh air inlet 3 and the return air exhaust port 4. The air handling unit is switched between different modes by controlling the opening and closing of the first damper 5, the second damper 6 and the third damper 20 and the start and stop of the heat exchange component. Example

[0084] The interior of the air handling unit is divided into a fresh air channel 1 and a return air channel 2 by a partition. A fresh air inlet 3 and a fresh air exhaust 23 are arranged on both sides of the fresh air channel 1. A return air inlet 24 and a return air exhaust 4 are arranged on both sides of the return air channel 2. A first heat exchange component 7 and a first fan 9 are arranged inside the fresh air channel 1. A second heat exchange component 8 and a second fan 10 are arranged inside the return air channel 2. The interior of the machine body also includes components and electric control components commonly used in fresh air dehumidification equipment. An electrically controlled first damper 5 and a second damper 6 are respectively arranged on the fresh air inlet 3 and the return air exhaust 4. An electrically controlled third damper 20 is opened on a section of the partition near the fresh air inlet 3 and the return air exhaust 4. The air handling unit is switched between different modes by opening and closing the first damper 5, the second damper 6 and the third damper 20 and starting and stopping the heat exchange component. Specifically, the following modes are included:

[0085] No fresh air purification mode: Figure 1 As shown, the first damper 5 and the second damper 6 are controlled to be completely closed, the third damper 20 is opened, the first fan 9 is turned on, the second fan 10 is turned off, and the heat exchange component is not started; the indoor air is drawn in from the return air inlet 24 and purified by the purification component 11, and the purified air enters the fresh air channel 1 from the return air channel 2 through the third damper 20 and is discharged from the fresh air exhaust port 23, and the closed purification of the indoor air is completed through repeated cycles.

[0086] Fresh air purification mode: Figure 2 As shown, the third damper 20 is controlled to be closed, the first damper 5 and the second damper 6 are fully opened, the heat exchange component is not started, and the first fan 9 is turned on. At this time, the system is in a fresh air mode, without dehumidification, only ventilation. At the same time, the one-way fresh air mode or the two-way fresh air mode can be adopted by the start and stop control of the second fan 10.

[0087] Some fresh air purification modes: Figure 3 As shown, the first damper 5 and the second damper 6 are opened, and the opening angle of the third damper 20 is controlled according to the return air volume that needs to be mixed. Different opening angles of the third damper 20 correspond to different air volumes passing through the third damper 20. The heat exchange component is not started, and the first fan 9 and the second fan 10 are turned on; part of the air discharged from the return air outlet 4 is mixed with the drawn fresh air through the third damper 20, and then introduced into the room through the fresh air outlet 23.

[0088] Some fresh air purification modes are suitable for environments with a certain temperature difference between indoors and outdoors. Users hope to recover a certain degree of cold or heat without turning on the heat exchange component, thereby ensuring that when the fresh air ventilation is turned on, the indoor cold or heat loss is small.

[0089] No fresh air dehumidification mode: Figure 4As shown, when the indoor humidity is relatively high or the outdoor air quality is relatively poor, the third damper 20 is fully opened, the first damper 5 and the second damper 6 are closed, the heat exchange component is started, and the first fan 9 is turned on; the indoor air enters the return air channel 2 from the return air inlet 24 and then enters the fresh air channel 1 through the third damper 20, and is cooled on the first heat exchange component 7 to precipitate water droplets before being discharged into the room. Repeated cycles can achieve efficient dehumidification without fresh air internal circulation, so that the indoor humidity can be adjusted to a suitable level as soon as possible.

[0090] Fresh air dehumidification mode: Figure 5 As shown, the third damper 20 is controlled to be closed, the first damper 5 and the second damper 6 are fully opened, the heat exchange component is started, and the first fan 9 and the second fan 10 are both turned on; the fresh air dehumidification mode is suitable for scenes where the indoor and outdoor temperature and humidity are relatively suitable and the air quality is good, and the indoor environment is crowded or there are other scenes with certain ventilation and dehumidification needs.

[0091] Some fresh air dehumidification modes: Figure 6 As shown, when the outdoor temperature is high and reaches the set temperature threshold, the first damper 5 is controlled to be partially or completely closed, the third damper 20 is opened, and the heat exchange component is started. After a part of the indoor air is introduced from the return air inlet 24, the temperature after passing through the second heat exchange component 8 is lower than the outdoor temperature. The airflow after passing through the second heat exchange component 8 is introduced into the fresh air channel 1 through the third damper 20 and mixed with the high temperature outdoor fresh air drawn from the fresh air inlet 3, and enters the room through the fresh air outlet 23 to achieve cooling. The partial fresh air dehumidification mode can reduce the load and save power consumption under the same dehumidification effect.

[0092] When installing the above-mentioned full-function air handling unit, the fresh air outlet located in the room is connected to an external guide pipe to extend the fresh air outlet port and configure it at a certain distance from the return air inlet 24, thereby preventing airflow short circuit.

[0093] Preferably, the first damper 5, the second damper 6 and the third damper 20 are air guide louvers with controllable opening. When the openings of the first damper 5 and the second damper 6 are constant, the mixing amount of the airflow in the return air duct 2 and the fresh air flow can be controlled by controlling the opening size of the third damper 20, so that the dehumidification efficiency, the indoor fresh air supply and the power consumption are balanced.

[0094] like Figure 7 As shown, a dehumidification wheel 22 is provided inside the air handling unit, and the operation area of ​​the dehumidification wheel 22 is set in half, one half is set in the return air channel 2 and is located between the second heat exchange component 8 and the return air inlet 24, and the other half is set in the fresh air channel 1 and is located between the first heat exchange component 7 and the fresh air outlet 23. A first electric heating component 21 is also provided between the dehumidification wheel 22 and the return air inlet 24 in the return air channel 2.

[0095] The air handling unit with the dehumidification wheel 22 added can operate in the cooling-multi-stage dehumidification mode. When the cooling-multi-stage dehumidification mode is turned on in summer, the outdoor fresh air is preliminarily dehumidified by the first heat exchange component 7. When the humidity is high, the dehumidification wheel 22 processing area further adsorbs moisture to play a role in auxiliary dehumidification; at this time, the electric heating component in the return air channel 2 is turned on to heat the drawn return air. After the moisture desorption conditions in the regeneration zone of the dehumidification wheel 22 are met, the return air will carry moisture through the second heat exchange component 8, and finally dehumidify from the return air exhaust port 4, completing the cycle process of auxiliary dehumidification of the dehumidification wheel 22.

[0096] like Figure 8 As shown, a supplementary air port 16 is provided between the return air inlet 24 and the second heat exchange assembly 8, and the switch of the supplementary air port 16 is controlled by an electrically controlled fourth damper 17, and the fourth damper 17 rotates to selectively close the return air channel 2 air inlet or the supplementary air port 16;

[0097] The system switches to the heating mode by reversing the refrigerant by the four-way valve 13. The outdoor fresh air is introduced from the fresh air inlet, heated by the first heat exchange component 7, and then continues to pass through the regeneration area of ​​the dehumidification wheel 22 to complete the desorption of moisture and carry the moisture into the room, completing the fresh air heating and waterless humidification.

[0098] When the outdoor weather is relatively stable without major fluctuations, it can be considered that the outdoor air humidity remains constant. When the dry-bulb and wet-bulb temperatures in the environment are 6°C-7°C, the air humidity content is 5.43 / kg.

[0099] When outdoor air enters the fresh air channel 1, it is heated to a certain extent by the second heat exchange component 8, and the dry-bulb temperature of the outdoor air is raised to 30°C. While maintaining the same moisture content (5.43g / kg), its wet-bulb temperature is 16°C under standard conditions; when the dry / wet-bulb temperatures are 30°C / 16°C respectively, its relative humidity has been reduced to 20%, the degree of dryness is already high, and it has a strong regeneration ability (moisture absorption ability), that is, after the air is heated and passes through the desorption zone of the dehumidification wheel 22, it can fully desorb and absorb moisture from water molecules, and the gas after moisture absorption is then introduced into the room, thereby achieving continuous waterless humidification effect and fresh air heating effect.

[0100] At this time, the fourth air door 17 is turned to close the return air inlet 24 of the return air duct 2 and open the air supply port 16; the outdoor air with a certain humidity is introduced from the air supply port 16, and the treatment area of ​​the dehumidification wheel 22 fully absorbs moisture, and then heat is exchanged through the second heat exchange component 8, and finally discharged from the return air outlet 4, thereby realizing the fresh air warming and waterless humidification functions in the heating mode.

[0101] The key is that after the air duct is opened, the low-temperature and high-humidity air outdoors will be continuously introduced into the return air duct 2 as a moisture source supplement for the dehumidification wheel 22 treatment area. The return air after moisture is adsorbed becomes dry return air with a slightly higher temperature and then passes through the second heat exchange component 8 at the rear. Its relative humidity is already low and the dew point is very low, so that the heat exchange component can operate at a lower evaporation temperature to prevent frost and improve the operating efficiency of the equipment. The moisture in the outdoor air can be continuously transported to the outdoors, thereby achieving the effect of preventing frost and waterless humidification.

[0102] The first heat exchange component 7 and the second heat exchange component 8 of the air handling unit can be replaced by a heat recovery wheel 26, and a second electric heating component 25 is installed between the dehumidification wheel 22 and the heat recovery wheel 26 in the fresh air channel 1. Fig. 9 As shown, when the air handling unit operates in the cooling-multi-stage dehumidification mode, the heat recovery wheel 26 rotates to the fresh air channel 1 to absorb heat, and the outdoor fresh air entering the fresh air channel 1 is pre-cooled, thereby improving the effect of water adsorption of the fresh air in the regeneration zone of the dehumidification wheel 22; the heat recovery wheel 26 rotates to the return air channel 2 to release heat, and cooperates with the high-humidity return air passing through the regeneration zone of the dehumidification wheel 22 to bring the heat out of the room, and the circulation operation is continued.

[0103] like Fig.10 As shown, in heating-waterless humidification, the heat recovery wheel 26 rotates to the return air channel 2 to absorb heat, further absorbing heat and humidity in the air. When fresh air enters from the fresh air channel 1, the heat recovery wheel 26 rotates to the bottom, and the fresh air obtains the heat and humidity accumulated in the heat recovery wheel 26, and then is heated by the second electric heating component 25 to achieve desorption conditions, bringing the water in the desorption area of ​​the dehumidification wheel 22 into the room, completing the functions of fresh air heating and waterless humidification. At the same time, using the heat recovery wheel 26 instead of the heat pump can also reduce noise to a certain extent.

[0104] Furthermore, the purification component 11 is a multi-stage extractable purification component 11, which can be freely combined and configured according to the number of configuration layers and purification levels.

[0105] The air handling unit also includes a temperature and humidity detection module and an air quality detection module. The temperature sensor and humidity sensor in the temperature and humidity detection module are connected to the system controller to detect the indoor and outdoor temperature and humidity in real time. The multiple groups of sensors set in the air quality detection module are connected to the system controller to detect the concentration of gases such as CO2, PM2.5, TVOC, oxygen (O2), carbon dioxide (CO2), carbon monoxide (CO), and formaldehyde (CH2O) in real time to monitor the quality of the air. The following is the indoor temperature and humidity, indoor carbon dioxide and PM2.5 concentration, and refrigerant leakage control method of the air handling unit of the present invention;

[0106] Indoor temperature and humidity control:

[0107] S1: The user sets the humidity Φs according to his / her needs. If not set, the system will automatically assign the value. The system has preset humidity thresholds ΦA (range: 60% to 65%) and ΦB (range: 45% to 50%). The user-set humidity Φs must meet ΦA>Φs>ΦB. After the user sets the set humidity Φs, the system starts. The value range of the humidity thresholds ΦA and ΦB will be adaptively adjusted by the system depending on the season and ambient temperature.

[0108] Step S2: When the system detects that Φir>ΦA, the system regards that the indoor humidity Φir is too high, and the system will directly start the no-fresh air dehumidification mode (dehumidifier) ​​until Φir reaches the set humidity Φs;

[0109] Step S3, when Φir reaches Φs, that is, the system detects that ΦA>Φir(Φs)>ΦB, it is considered that the indoor humidity Φir is in a relatively suitable state and is in a stable state; after the indoor environment is in the stable state, the system will continue to enable different dehumidification modes according to different temperature and humidity conditions to maintain the set humidity Φs;

[0110] Step S31, when Φor<Φir, and Tor<Ta, the outdoor air temperature and humidity are low, and the system considers that there is no need to start the heat exchange device to dehumidify the fresh air, and starts the fresh air purification mode (fresh air fan), and directly uses the low-temperature and low-humidity outdoor air to dry and dehumidify the indoor air;

[0111] Step S32: When Φor>Φir, the outdoor air humidity is high, and the system considers that it is necessary to activate the heat exchange device to dehumidify the fresh air before introducing it into the room for dehumidification;

[0112] Step S321, when Tor<Tb, and Φor<Φc, the system considers that the outdoor fresh air temperature and humidity are appropriate, the evaporator load is small, the cooling capacity demand per unit time is small, and the energy consumption of the compressor 12 is reasonable. The system will directly start the fresh air dehumidification mode (fresh air dehumidifier) ​​to continuously dehumidify and ventilate the room;

[0113] Step S322, when Tor>Tb, and Φor>Φc, the system regards that the outdoor air temperature and humidity are too high, causing the evaporator to be overloaded. At this time, the system will start the partial fresh air dehumidification mode (partial fresh air dehumidifier), using a mixed flow method of partial return air return and imported fresh air. After the mixed flow, the temperature and humidity of the imported fresh air are reduced, the required unit cooling capacity is reduced, and the power consumption of the compressor 12 is reduced, while maintaining a certain amount of fresh air.

[0114] Step S3221, based on the partial fresh air dehumidification mode (partial fresh air dehumidifier) ​​described in step S322: when the speed of the first fan 9 / the second fan 10 is constant, the system dynamically controls the opening of the third damper 20 according to the outdoor temperature Tor, the outdoor humidity Φor and the indoor air quality parameters through the control algorithm, and intelligently controls the mixing amount of return air and high-temperature and high-humidity fresh air to achieve the optimal balance among dehumidification efficiency, indoor fresh air supply and power consumption.

[0115] Indoor carbon dioxide and PM2.5 concentration control:

[0116] The air handling unit control quality module detects the concentration values ​​of indoor and outdoor pollution sources such as CO2 and PM2.5, thereby obtaining the indoor carbon dioxide concentration Cir-CO2, the indoor PM2.5 concentration Cir-PM2.5, the outdoor carbon dioxide concentration Cor-CO2 and the outdoor PM2.5 concentration Cor-PM2.5; the indoor air cleanliness level is determined by the indoor carbon dioxide concentration Cir-CO2 and the indoor PM2.5 concentration Cir-PM2.5, and the air handling unit is controlled to enter different operation modes in combination with the outdoor carbon dioxide concentration Cor-CO2 and the outdoor PM2.5 concentration Cor-PM2.5; the specific steps include:

[0117] (I) When Cir-CO2 is less than 500PPM and Cir-PM2.5 is less than 35μg / m3, the system considers that the indoor air is currently at a clean level and will give priority to maintaining the durability of the purification component 11. The operating mode of the air handling unit is adjusted based on the outdoor carbon dioxide concentration Cor-CO2 and the outdoor PM2.5 concentration Cor-PM2.5. When the indoor air quality index reaches the clean level, the operating mode before adjustment is restored and the operation is maintained continuously.

[0118] Specifically, when the indoor air quality is Cir-CO2<500PPM, Cir-PM2.5<35μg / m3, the specific way in which the air handling unit is adjusted according to the outdoor air quality is:

[0119] (1) When Cor-CO2>Cir-CO2 (110%) and Cor-PM2.5>30μg / m3, the system considers that the outdoor air is only slightly worse, and the system is only not suitable for large-scale indoor and outdoor ventilation. The system will shut down the fresh air purification mode and the other modes will be open normally;

[0120] (2) When Cor-CO2>Cir-CO2 (120%) and Cor-PM2.5>50μg / m3, the system considers the outdoor air to be poor, and the system will shut down the two fresh air modes. Some fresh air modes will operate in an intermittent fresh air introduction mode.

[0121] (3) When Cor-CO2>Cir-CO2 (130%) and Cor-PM2.5>100μg / m3, the system regards the outdoor air as extremely poor and does not allow ventilation. The system only allows the following modes to be started: no fresh air purification mode (purifier) ​​and no fresh air dehumidification mode (dehumidifier). If the system is in other modes at this time, it will be directly set to the above two modes for operation.

[0122] (ii) When Cir-CO2>500PPM, Cir-PM2.5>60μg / m3, the system considers that the indoor air is at a poor level at this time. The system will take indoor air quality treatment as the main goal and maintain the durability of the purification component 11 as the secondary goal for feedback control. When the indoor air quality index reaches the clean level, the system will restore the operation mode before adjustment and continue to operate.

[0123] Specifically, when the indoor air quality is Cir-CO2>500PPM, Cir-PM2.5>60μg / m3, the specific way in which the air handling unit is adjusted according to the outdoor air quality is:

[0124] (1) If the system is running in one of the following modes: fresh air purification (fresh air fan) or fresh air dehumidification (fresh air dehumidifier), the system will increase the rotation speed of the first fan 9 and the second fan 10 within a certain period of time to temporarily increase the fresh air circulation volume;

[0125] (2) If the system is running in two modes at this time: partial fresh air purification and partial fresh air dehumidification, it will be directly adjusted to the fresh air purification mode and the fresh air dehumidification mode.

[0126] The control parameters of its heat exchange components are adjusted accordingly, thereby increasing the fresh air circulation volume;

[0127] (3) If the system operation mode at this time is: no fresh air purification (purifier) ​​and no fresh air dehumidification (dehumidifier), it will be directly adjusted to partial fresh air purification mode (partial fresh air purifier) ​​and partial fresh air dehumidification mode (partial fresh air dehumidifier), thereby increasing a part of the fresh air circulation volume.

[0128] (III) When Cir-CO2>800PPM, Cir-PM2.5>200μg / m3, the system considers that the indoor air is at an extremely poor level and the oxygen content is seriously insufficient; the system will take indoor air quality treatment as the core goal, ignoring the durability of the purification component 11, and wait until the indoor air quality indicators reach the clean level, then restore the operation mode before adjustment and continue to operate.

[0129] Specifically, when the indoor air quality is Cir-CO2>800PPM, Cir-PM2.5>200μg / m3, the specific way in which the air handling unit is adjusted according to the outdoor air quality is: the current operating mode of the system will be directly adjusted to the fresh air purification mode, and the speed of the first fan 9 and the second fan 10 will be increased to maximize the fresh air circulation volume.

[0130] Refrigerant leakage control:

[0131] like Fig.11 As shown, an exhaust port 18 is arranged between the first fan 9 and the fresh air exhaust port 23, and a fifth damper 19 is arranged at the exhaust port 18. The fifth damper 19 can be rotated to close or open the exhaust port 18 or the fresh air channel 1.

[0132] (I) When refrigerant leakage occurs, the control system cannot determine whether the refrigerant leaks from the first heat exchange component 7 or the second heat exchange component 8. The specific operation steps for directly performing refrigerant exhaust are as follows:

[0133] Step S1, control the fifth damper 19 to rotate and close the exhaust port 18 of the fresh air channel 1 to prevent the leaked refrigerant from entering the room through the fresh air exhaust port 23. At this time, the exhaust port 18 is open.

[0134] Step S2, the fourth air door 17 closes the return air inlet 24 of the return air channel 2, and the supply air port 16 is opened.

[0135] Step S3, close the first damper 5 and the second damper 6, and fully open the third damper 20.

[0136] Step S4 , turning on the first fan 9 , increasing the rotation speed of the first fan 9 , and discharging the leaked refrigerant from the exhaust port 18 .

[0137] (ii) If the refrigerant leaks from the second heat exchange component 8, the leaked refrigerant will carry the airflow and completely flow through the purification component 11 during the exhaust, causing serious pollution to the purification component 11, thereby seriously reducing the durability of the purification component 11. Therefore, a method is provided as follows: Fig.12 The optimized refrigerant leakage evacuation method is shown. The specific steps are as follows:

[0138] Step S1, control the fifth damper 19 to rotate and close the exhaust port 18 of the fresh air channel 1 to prevent the leaked refrigerant from entering the room through the fresh air exhaust port 23. At this time, the exhaust port 18 is open.

[0139] Step S2, the fourth air door 17 closes the return air inlet 24 of the return air channel 2, and the supply air port 16 is opened.

[0140] Step S3, fully open the first damper 5 and the second damper 6, and close the third damper 20.

[0141] Step S4, turning on the first fan 9 and the second fan 10, and increasing the rotation speeds of the first fan 9 and the second fan 10 to discharge the leaked refrigerant from the exhaust port 18.

Claims

1. A full-function air handling unit, characterized in that: It includes a controller, a throttling device, a rotating motor, a compressor, a four-way valve and an outer casing; The interior of the outer shell is divided into a fresh air channel and a return air channel by a partition; A fresh air outlet is arranged at one end of the fresh air passage connected to the indoor room, a fresh air inlet is arranged at the end opposite to the fresh air outlet, a first air door is arranged at the fresh air inlet, and a first fan, a first heat exchange component and a purification component are arranged in the fresh air passage; A return air inlet is arranged at one end of the return air duct connected to the indoor room, a return air outlet is arranged at the end opposite to the return air inlet, a second air door is arranged at the return air outlet, and a second fan and a second heat exchange component are arranged in the return air duct; The first heat exchange component and the second heat exchange component are connected to the compressor through a four-way valve; A through-ventilation hole that runs through the fresh air passage and the return air passage is provided on a section of the partition member close to the fresh air inlet and the return air outlet, and a third air door is provided at the through-ventilation hole; It also includes a dehumidification wheel and a first electric heating component, wherein half of the operating area of ​​the dehumidification wheel is arranged in the fresh air channel, and the other half is arranged in the return air channel, the half arranged in the fresh air channel is located between the first heat exchange component and the fresh air outlet, the half arranged in the return air channel is located between the return air inlet and the second heat exchange component, and the first electric heating component is arranged between the return air inlet and the dehumidification wheel; An air supply port is provided on the shell of the return air channel, and the position of the air supply port on the shell is between the first electric heating component and the return air inlet. A rotatable fourth air door is provided at the air supply port, and the fourth air door rotates to close the return air channel or the air supply port; It also includes a second electric heating component, wherein the first heat exchange component and the second heat exchange component are heat recovery wheels, and the second electric heating component is arranged between the heat recovery wheel and the dehumidification wheel in the fresh air channel; An exhaust port is arranged on the shell of the fresh air channel, and the position of the exhaust port on the shell is between the first fan and the fresh air exhaust port. A rotatable fifth damper is arranged at the exhaust port, and the fifth damper rotates to close the fresh air channel or the exhaust port.

2. A full-function air handling unit according to claim 1, characterized in that: The first air door, the second air door and the third air door are electrically controlled air guide louvers.

3. A full-function air handling unit according to claim 1, characterized in that: The purification component of the fresh air channel is a multi-stage extraction purification component.

4. A full-function air handling unit according to claim 1, characterized in that: It also includes a temperature and humidity detection module and an air quality detection module, and the temperature and humidity detection module and the air quality detection module are connected to the controller.

5. A full-function air handling unit control method, applied to the full-function air handling unit according to any one of claims 1 to 4, characterized in that: The user controls the start and stop of the first, second and third dampers of the air handling unit and the opening angle, and the start and stop of the heat exchange component through the control terminal to switch between the six operating modes: no fresh air purification mode, fresh air purification mode, partial fresh air purification mode, no fresh air dehumidification mode, fresh air dehumidification mode and partial fresh air dehumidification mode; The fresh air exhaust vent and the return air inlet are open, the fresh air inlet and the return air exhaust vent are closed, the through-ventilation vent is open, the first fan is turned on, the second fan is turned off, and the heat exchange component is not started; the air handling unit operates in the non-fresh air purification mode, and the indoor air enters the fresh air duct from the return air inlet through the purification component and returns to the room from the fresh air duct exhaust vent; The fresh air exhaust vent and the return air inlet are open, the fresh air inlet and the return air exhaust vent are open, the through-air vent is closed, the first fan is turned on, and the heat exchange component is not started; the air handling unit operates in the fresh air purification mode; the outdoor air enters the room from the fresh air inlet and is discharged from the return air exhaust vent; The fresh air exhaust vent and the return air inlet are open, the fresh air inlet and the return air exhaust vent are open, the opening of the third door is used to control the mixing amount of fresh air and return air in the through-air vent, the first fan is turned on, the second fan is turned on, and the heat exchange component is not started; the air handling unit operates in a partial fresh air purification mode, and the return air discharged from the return air channel and the fresh air drawn into the fresh air channel are mixed through the through-air vent and then introduced into the room; The fresh air exhaust port and the return air inlet are opened, the fresh air inlet and the return air exhaust port are closed, the through-ventilation port is opened, the first fan is turned on, the second fan is turned off, and the heat exchange component is started; the air handling unit operates in a no-fresh air dehumidification mode, and the indoor air enters the fresh air channel from the return air inlet through the through-ventilation port, and is discharged into the room after being dehumidified by the first heat exchange component; The fresh air outlet and the return air inlet are opened, the fresh air inlet and the return air outlet are opened, the through-air outlet is closed, the first fan is turned on, the second fan is turned on, and the heat exchange component is started; the air handling unit operates in the fresh air dehumidification mode, and the outdoor air enters from the fresh air outlet and is dehumidified by the dehumidification component before entering the room; The fresh air inlet is opened, the return air outlet is completely closed or closed at a set angle, the third damper is opened, the first fan is turned on, and the second fan is turned on; the air handling unit operates in partial fresh air dehumidification mode, and the indoor air enters from the return air inlet, is heated by the second heat exchange component, enters the fresh air channel from the through air outlet and mixes with the outdoor fresh air to achieve cooling.

6. A full-function air handling unit control method according to claim 5, characterized in that: It also includes a heating-fresh air heating-waterless dehumidification mode. The fresh air inlet and the return air outlet are opened, the first heat exchange component is turned on, and the dehumidification wheel is turned on. The outdoor fresh air passes through the first heat exchange component and the dehumidification wheel regeneration area to complete the fresh air heating and waterless humidification. The fourth air door is rotated to close the return air channel, and the air supply port is opened. The outdoor air is introduced from the air supply port, passes through the dehumidification wheel treatment area for moisture adsorption, and is discharged from the return air outlet after heat exchange by the second heat exchange component.

7. A full-function air handling unit control method according to claim 5, characterized in that: It also includes a cooling-multi-stage dehumidification mode, in which the fresh air inlet and the return air exhaust outlet are opened, the through-air vents are closed, the first fan is turned on, the second fan is turned on, the first heat exchange component is turned on, the dehumidification wheel is turned on, the first electric heating component is turned on, and the second heat exchange component is turned on; the outdoor fresh air enters the fresh air channel from the fresh air inlet, is dehumidified by the first heat exchange component, and then passes through the dehumidification wheel for auxiliary dehumidification, the first electric heating component heats the return air, and after the dehumidification wheel desorbs moisture, the return air passes through the second heat exchange component and is discharged from the return air exhaust outlet.

8. A full-function air handling unit control method according to claim 5, characterized in that: It also includes a micro-positive pressure mode. When the air handling unit is in a sealed room, the through-air vents are closed, and the controller controls the speed difference between the first fan and the second fan so that the amount of fresh air entering the room is greater than the exhaust air volume, and the indoor air is discharged from the gaps in the room.

9. A full-function air handling unit control method according to claim 5, characterized in that: When the refrigerant in the air handling unit leaks, if the system determines that the second heat exchanger in the return air duct has a refrigerant leak, the steps to control the leaked refrigerant to be emptied are as follows: Step S1, controlling the fifth damper to rotate and close the exhaust port of the fresh air channel, and the exhaust port is opened; Step S2, the fourth damper closes the return air inlet of the return air channel, and the supply air outlet is opened; Step S3, close the first damper and the second damper, and fully open the third damper; Step S4, turning on the first fan, increasing the rotation speed of the first fan, and discharging the leaked refrigerant from the exhaust port; If the system cannot determine whether the refrigerant leakage occurs in the first heat exchanger or the second heat exchanger, the steps to control the leakage of refrigerant are as follows: Step S1, control the fifth damper to rotate and close the exhaust port of the fresh air channel, and open the exhaust port; Step S2, the fourth damper closes the return air inlet of the return air channel, and the supply air outlet is opened; Step S3, fully open the first damper and the second damper, and close the third damper; Step S4, turning on the first fan and the second fan, and increasing the rotation speeds of the first fan and the second fan to discharge the leaked refrigerant from the exhaust port.

10. A full-function air handling unit control method according to claim 5, characterized in that: The system changes the operation mode of the air handling unit according to the indoor humidity Φir, outdoor humidity Φor, indoor temperature Tir and outdoor temperature Tor detected by the temperature and humidity detection module to improve the indoor air quality, which specifically includes the following steps: S1: The user sets the indoor humidity Φs and enters step S2; wherein ΦA>Φs>ΦB, ΦA is the set upper humidity limit, and ΦB is the set lower temperature limit; S2: When the system detects that Φir>ΦA, the air handling unit starts the no-fresh air dehumidification mode until Φir reaches the set humidity Φs, maintains the set humidity Φs and enters step S3; S3: Compare the indoor and outdoor temperature and humidity values ​​and control the air handling unit to enter different operation modes; S31: When Φor<Φir, and Tor<Ta, Ta is the first threshold of outdoor temperature, the air handling unit operates in the fresh air purification mode; S32: When Φor>Φir, the heat exchange component is activated to dehumidify the outdoor fresh air and then introduce the fresh air into the room; S321: When Tor<Tb, and Φor<Φc, Tb is the second threshold of outdoor temperature, the air handling unit operates in the fresh air dehumidification mode; S322: When Tor>Tb, and Φor>Φc, the air handling unit operates in a partial fresh air dehumidification mode; S3221: When the air handling unit operates in partial fresh air dehumidification mode, when the speed of the first fan or the second fan is constant, the system dynamically controls the opening of the third damper according to the outdoor temperature Tor, outdoor humidity Φor and indoor air parameters detected by the air quality detection module, and controls the mixing amount of return air and high-temperature fresh air.

11. The control method of a full-function air handling machine according to claim 5, characterized in that: The system changes the operation mode of the air handling unit according to the indoor and outdoor CO2 concentration and PM2.5 concentration detected by the air quality detection module to improve the indoor air quality. The specific steps include: S1. Determine the cleanliness level of indoor air according to the indoor carbon dioxide concentration and PM2.5 concentration. If Cir-CO2 is less than the first threshold of indoor carbon dioxide concentration and Cir-PM2.5 concentration is less than the first threshold of indoor PM2.5 concentration, proceed to step S11. If Cir-CO2 is greater than or equal to the first threshold of indoor carbon dioxide concentration, and Cir-PM2.5 is greater than the second threshold of indoor PM2.5 concentration, proceed to step S12; If Cir-CO2 is greater than or equal to the second threshold of indoor carbon dioxide concentration, and Cir-PM2.5 is greater than the third threshold of indoor PM2.5 concentration, proceed to step S13; S11: Cor-CO2>1.1*Cir-CO2, and Cor-PM2.5 is greater than or equal to the first threshold of outdoor PM2.5 concentration, the air handling unit turns off the fresh air mode; Cor-CO2>1.2*Cir-CO2, and Cor-PM2.5 is greater than or equal to the second threshold of outdoor PM2.5 concentration, fresh air is introduced intermittently; Cor-CO2>1.3*Cir-CO2, and Cor-PM2.5 is greater than or equal to the third threshold of outdoor PM2.5 concentration, the air handling unit operates in the no-fresh air purification mode or the no-fresh air dehumidification mode; The first threshold of indoor carbon dioxide concentration is less than the second threshold of indoor carbon dioxide concentration; The third threshold of indoor PM2.5 concentration> the second threshold of indoor PM2.5 concentration> the first threshold of indoor PM2.5 concentration; The third threshold of outdoor PM2.5 concentration>the second threshold of outdoor PM2.5 concentration>the first threshold of outdoor PM2.5 concentration; S12: If the air handling unit is in the fresh air purification mode or the fresh air dehumidification mode at this time, the system increases the circulation volume of the indoor fresh air by increasing the rotation speeds of the first fan and the second fan; If the air handling unit is operating in partial fresh air purification mode or partial fresh air dehumidification mode at this time, the partial fresh air purification mode is adjusted to the fresh air purification mode, and the partial fresh air dehumidification mode is adjusted to the fresh air dehumidification mode; If the air handling unit is in the no fresh air purification mode or the no fresh air dehumidification mode, the no fresh air purification mode is adjusted to the partial fresh air purification mode, and the no fresh air dehumidification mode is adjusted to the partial fresh air dehumidification mode; S13: The operation mode of the air handling unit is adjusted to the fresh air purification mode, and the rotation speeds of the first fan and the second fan are increased.

12. A control method for a full-function air handling machine according to claim 11, characterized in that: The first threshold of indoor carbon dioxide concentration is 500PPM, and the second threshold of indoor carbon dioxide concentration is 800PPM; The first threshold of indoor PM2.5 concentration is 35 μg / m 3 The second threshold of indoor PM2.5 concentration is 60μg / m 3 The third threshold of indoor PM2.5 concentration is 200 μg / m 3 ; The first threshold of outdoor PM2.5 concentration is 30 μg / m 3 The second threshold of outdoor PM2.5 concentration is 50 μg / m 3 The third threshold of outdoor PM2.5 concentration is 100 μg / m 3 .

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