Air conditioning system control method and system

Abstract

The application discloses an air conditioner system control method and system, relates to the refrigeration technical field, and comprises a central control unit, a host group and a return air processing unit. The method comprises the following steps: acquiring fresh air temperature and humidity, return air temperature and humidity, mixed air temperature, supply air temperature and humidity, and preset temperature and humidity thresholds; determining a system working mode based on the return air temperature and the temperature threshold; and controlling the specific working mode of the host group and the return air processing unit according to the system working mode, the various temperature and humidity, the temperature threshold and the humidity threshold. The return air processing unit is arranged, the outdoor low-temperature fresh air is used to cool the indoor high-temperature return air, and the system energy consumption is greatly reduced. The central control unit acquires the temperature and humidity of the outdoor fresh air and the indoor return air, combines the temperature and humidity of the mixed air and the supply air and the preset indoor temperature and humidity thresholds, selects a suitable system working mode, intelligently controls the host group and the return air processing unit, and realizes effective and rapid cooling of the high-temperature return air under the premise of low load and low energy consumption of the system.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of refrigeration, and particularly relates to an air conditioning system control method and system. BACKGROUND

[0002] As a key device for power conversion, a converter valve generates a large amount of heat in the operation process. In order to ensure the normal operation of the valve hall and reduce the interference of outdoor air on the valve hall, the conventional air handling unit of the converter valve hall usually adopts minimum fresh air operation, and the return air occupies a large part of the total air volume. The double load of fresh air and high-temperature return air leads to high energy consumption of the conventional air conditioner. SUMMARY

[0003] To solve at least one of the above defects, the application provides an air conditioning system control method and system, which overcomes the deficiencies in the prior art.

[0004] In one aspect, the application provides an air conditioning system, which comprises a central control unit, a main unit and a return air handling unit,

[0005] The main unit comprises a heat exchanger electrically connected to the central control unit, and the heat exchanger is further connected to an air conditioning unit. The return air handling unit comprises an air heat exchanger for heat exchange treatment of indoor return air,

[0006] The method comprises:

[0007] Fresh air enters the main unit through a fresh air inlet of the main unit;

[0008] The heat-exchanged fresh air enters the air heat exchanger, and the indoor return air entering the return air handling unit is heat-exchanged and discharged;

[0009] The return air enters the return air handling unit through an indoor return air inlet, and after heat exchange treatment by the air heat exchanger, the return air enters the main unit through a return air outlet;

[0010] The heat-exchanged return air enters the main unit and mixes with the fresh air entering the main unit to obtain mixed air;

[0011] The mixed air is heat-exchanged by the heat exchanger to obtain supply air, and the supply air is sent into the indoor space through a supply air outlet of the main unit;

[0012] The fresh air temperature and fresh air humidity, the return air temperature and return air humidity entering the return air handling unit, the mixed air temperature, the supply air temperature and supply air humidity, a preset temperature threshold value and a humidity threshold value are obtained;

[0013] Based on the return air temperature and the temperature threshold value, the system working mode is determined;

[0014] According to the system working mode, the fresh air temperature and fresh air humidity, the return air temperature and return air humidity, the mixed air temperature, the supply air temperature and supply air humidity, preset temperature threshold and humidity threshold, the working mode of the return air treatment unit and the main unit is controlled.

[0015] Preferably, the system working mode is determined based on the return air temperature and the temperature threshold, specifically comprising:

[0016] A first temperature difference is preset, and the first temperature difference is greater than 0℃,

[0017] If the return air temperature is less than the difference between the lower limit value of the temperature threshold and the first temperature difference, the central control unit controls the system to enter the heating mode;

[0018] If the return air temperature is greater than or equal to the difference between the lower limit value of the temperature threshold and the first temperature difference, and less than the lower limit value of the temperature threshold, the central control unit controls the system to enter the standby mode;

[0019] If the return air temperature is greater than or equal to the lower limit value of the temperature threshold, the central control unit controls the system to enter the cooling mode.

[0020] Preferably, the main unit further comprises a first heater, a second heater and a humidifier, wherein the fresh air passes through the first heater after entering the fresh air inlet of the main unit, and then mixes with the return air treated by the return air treatment unit to obtain the mixed air; the mixed air passes through the heat exchanger, the second heater and the humidifier in sequence to reach the supply air outlet of the main unit.

[0021] The return air treatment unit further comprises a spraying assembly and a fan, the spraying assembly is used for heat exchange treatment of the heat exchange fresh air, and the heat exchange fresh air performs heat exchange on the indoor return air after passing through the spraying assembly; the fan is used for discharging the heat exchange fresh air after heat exchange on the indoor return air.

[0022] Preferably, the working mode of the return air treatment unit is controlled, comprising controlling the working mode of the fan, specifically comprising:

[0023] When the system working mode is the cooling mode, the central control unit calculates the fresh air dew point temperature based on the fresh air temperature and the fresh air humidity, and presets a second temperature difference, the second temperature difference is greater than 0℃, a first fan condition temperature, a second fan condition temperature and a third fan condition temperature, a first fan frequency, a second fan frequency and a third fan frequency, wherein the first fan condition temperature is greater than the second fan condition temperature, the first fan frequency is greater than the second fan frequency, and the second fan frequency is greater than the third fan frequency;

[0024] If the fresh air dew point temperature is less than the difference between the return air temperature and the second temperature difference, and the return air temperature is greater than the upper limit of the temperature threshold, the central control unit turns on the fan, and the fan frequency is the first fan frequency;

[0025] If the fresh air dew point temperature is less than the difference between the return air temperature and the second temperature difference, and the return air temperature is within the temperature threshold: when the return air temperature is greater than or equal to the first fan condition temperature, the central control unit turns on the fan, and the fan frequency is the second fan frequency;

[0026] When the return air temperature is greater than or equal to the second fan condition temperature and less than the first fan condition temperature, the central control unit turns on the fan, and the fan frequency is the third fan frequency;

[0027] When the return air temperature is less than the second fan condition temperature, the central control unit turns off the fan.

[0028] Preferably, the control mode of the return air treatment unit includes controlling the working mode of the spraying assembly, specifically including:

[0029] A preset spraying condition temperature and a preset spraying condition humidity;

[0030] When the fresh air temperature is greater than or equal to the spraying condition temperature, and the fresh air humidity is less than the spraying condition humidity, if the fan is turned on at this time, the central control unit turns on the spraying assembly;

[0031] When the fresh air temperature is less than the spraying condition temperature, and / or the fresh air humidity is greater than the spraying condition humidity, the central control unit turns off the spraying assembly.

[0032] Preferably, the control mode of the main unit includes controlling the working mode of the first heater, specifically including:

[0033] A first heating condition temperature, a second heating condition temperature, a third heating condition temperature, a fourth heating condition temperature and a fifth heating condition temperature with preset values increasing in turn, and a first heating power, a second heating power, a third heating power, a fourth heating power and a fifth heating power with preset values decreasing in turn,

[0034] When the system working mode is the heating mode,

[0035] If the mixed air temperature is less than the first heating condition temperature, the central control unit turns on the first heater, and the power is the first heating power;

[0036] If the mixed air temperature is greater than or equal to the first heating condition temperature and less than the second heating condition temperature, the central control unit turns on the first heater at a second heating power;

[0037] If the mixed air temperature is greater than or equal to the second heating condition temperature and less than the third heating condition temperature, the central control unit turns on the first heater at a third heating power;

[0038] If the mixed air temperature is greater than or equal to the third heating condition temperature and less than the fourth heating condition temperature, the central control unit turns on the first heater at a fourth heating power;

[0039] If the mixed air temperature is greater than or equal to the fourth heating condition temperature and less than the fifth heating condition temperature, the central control unit turns on the first heater at a fifth heating power;

[0040] If the mixed air temperature is greater than or equal to the fifth heating condition temperature, the central control unit turns off the first heater.

[0041] Preferably, the control of the working mode of the host group includes the control of the working mode of the heat exchanger, specifically including:

[0042] When the working mode of the system is the cooling mode,

[0043] When the return air temperature is greater than the upper limit of the temperature threshold, the central control unit controls the heat exchanger to pass in chilled water, the chilled water flow rate is set to the maximum flow rate, the chilled water temperature is set to the preset minimum temperature, and the mixed air is cooled;

[0044] When the return air temperature drops to the temperature threshold, the working mode of the heat exchanger is further controlled according to the return air humidity, specifically including,

[0045] If the return air humidity is greater than the lower limit of the humidity threshold, the central control unit controls the heat exchanger to increase the chilled water temperature based on the current chilled water temperature and / or to reduce the chilled water flow rate based on the current chilled water flow rate,

[0046] If the return air humidity is less than the lower limit of the humidity threshold, the central control unit controls the heat exchanger to decrease the chilled water temperature based on the current chilled water temperature and / or to increase the chilled water flow rate based on the current chilled water flow rate,

[0047] If the return air humidity is within the humidity threshold, the chilled water temperature and flow rate in the heat exchanger remain unchanged;

[0048] When the system working mode is the heating mode, the central control unit controls the heat exchanger to pass in hot water, and the mixed air is subjected to heat exchange treatment.

[0049] Preferably, the control of the working mode of the main unit further comprises control of the working mode of the second heater, and specifically comprises:

[0050] A maximum supply air temperature difference is preset, and a supply air temperature difference is calculated based on the maximum supply air temperature difference,

[0051] When the system working mode is the heating mode, the central control unit starts the second heater to heat the mixed air, so that the temperature difference between the final supply air temperature and the return air temperature is kept as the supply air temperature difference.

[0052] Preferably, the supply air temperature difference calculated based on the maximum supply air temperature difference is expressed as:

[0053]

[0054] Preferably, the control of the working mode of the main unit comprises control of the working mode of the humidifier, and specifically comprises presetting a supply air condition humidity.

[0055] When the return air humidity is less than the lower limit value of the humidity threshold value, the central control unit starts the humidifier to humidify the mixed air, so that the supply air humidity is greater than the lower limit value of the humidity threshold value and less than or equal to the sum of the lower limit value of the humidity threshold value and the supply air condition humidity.

[0056] Compared with the prior art, the beneficial effects of the present application at least include: by setting the return air treatment unit, using outdoor low-temperature fresh air to cool indoor high-temperature return air, greatly reducing the heat exchanger load, the cooling capacity of the main unit and the system energy consumption. In specific implementation, the central control unit obtains the temperature and humidity of the outdoor fresh air and the indoor return air, combines the temperature and humidity of the mixed air and the supply air, and the preset indoor temperature and humidity threshold value, selects the appropriate system working mode, and intelligently controls the main unit and the return air treatment unit in different working modes, to realize effective and rapid cooling of high-temperature return air under the premise of low load and low energy consumption of the system. BRIEF DESCRIPTION OF DRAWINGS

[0057] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0058] Figure 1 A flow chart of an air conditioning system control method is provided.

[0059] Figure 2 An architectural diagram of an air conditioning system is provided for the present application.

[0060] Fig. 1 is a schematic diagram of a temperature and humidity control air conditioning system according to the present application. DETAILED DESCRIPTION

[0061] The present application provides a temperature and humidity control air conditioning system and a control method. To make the purpose, technical solutions and effects of the present application more clear and explicit, the present application is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and not to limit the present application.

[0062] Those skilled in the art can understand that the singular forms "a", "an" and "the" used herein include plural forms unless specifically stated otherwise. It should be further understood that the use of the term "include" in the specification of the present application means that the stated features, integers, steps, operations, elements, and / or components are present, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there can be intermediate elements. In addition, "connected" or "coupled" used herein can include wireless connection or wireless coupling. The phrase "and / or" used herein includes all or any single unit and all combinations of the associated listed items.

[0063] Those skilled in the art can understand that unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as that generally understood by those skilled in the art to which the present application belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have meanings consistent with those in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as such.

[0064] The content of the application is further described below by describing the examples in conjunction with the accompanying drawings.

[0065] The drawings of the present application are only used for illustrative description, and cannot be understood as limitation to the present application. In order to better illustrate the following embodiments, some components in the drawings may be omitted, enlarged or reduced, and do not represent the actual product size; it is understandable for those skilled in the art that some well-known structures and their descriptions in the drawings may be omitted.

[0066] In a first aspect, as Figure 1 An embodiment of an air conditioning system is provided, which comprises:

[0067] The air conditioner comprises a central control unit, a main unit 1 and a return air processing unit 2,

[0068] The main unit 1 comprises a heat exchanger 4 electrically connected to the central control unit, and the heat exchanger 4 is also connected to the air conditioning unit,

[0069] Optionally, the main unit 1 can further comprise a first heater 3, a second heater 5 and a humidifier 6;

[0070] A first heater 3, a heat exchanger 4, a second heater 5 and a humidifier 6 electrically connected to the central control unit are sequentially arranged between the fresh air inlet and the supply air outlet of the main unit 1;

[0071] In an optional scheme, the first heater 3 and the second heater 5 can adopt an electric heater to heat the outdoor fresh air or mixed air to improve the supply air temperature.

[0072] The heat exchanger 4 can adopt a surface cooling heat exchanger to cool or heat the mixed air according to the working mode of the system;

[0073] Optionally, the return air processing unit 2 comprises a spraying assembly 7, an air heat exchanger 8 and a fan 9;

[0074] The spraying assembly 7, the air heat exchanger 8 and the fan 9 electrically connected to the central control unit are sequentially arranged between the fresh air inlet and the fresh air outlet of the return air processing unit 2; the return air inlet of the return air processing unit 2 is in communication with the indoor, and the return air outlet is connected to the main unit 1. In actual implementation, the outdoor low-temperature heat exchange fresh air enters the return air processing unit, is cooled by the spraying assembly 7, enters the air heat exchanger, and performs heat exchange treatment on the indoor return air entering the return air processing unit, and the heat exchange fresh air after the heat exchange treatment is discharged to the outdoor.

[0075] In a preferred embodiment, the fresh air enters the main unit 1 through the fresh air inlet of the main unit 1, mixes with the return air processed by the return air processing unit 2 in the main unit 1 to obtain mixed air, the mixed air is subjected to heat exchange treatment by the heat exchanger 4 to obtain supply air, and the supply air is sent into the indoor through the supply air outlet of the main unit 1.

[0076] Preferably, the return air handling unit 2 may further include a first temperature and humidity sensing element 10 and a second temperature and humidity sensing unit 12. The first temperature and humidity sensing element 10 is disposed at the fresh air inlet of the return air handling unit 2 and is used to obtain the fresh air temperature T1 and fresh air humidity RH1 entering the return air handling unit. The second temperature and humidity sensing element 11 is disposed at the return air inlet of the return air handling unit 2 and is used to obtain the return air temperature T2 and return air humidity RH2 entering the return air handling unit 2.

[0077] Preferably, the main unit 1 may further include a second temperature sensing element 12 and a fourth temperature and humidity sensing element 13. The third temperature sensing element 13 is disposed between the mixing space 7 and the heat exchanger 4 to obtain the mixing temperature T3. The fourth temperature and humidity sensing element 13 is disposed at the air outlet of the main unit 1 to obtain the air supply temperature T4 and the air supply humidity RH4.

[0078] The first temperature and humidity sensing element 10, the second temperature and humidity sensing element 11, the second temperature sensing element 12 and the fourth temperature and humidity sensing element 13 are electrically connected to the central control unit and send the monitored temperature and humidity data to the central control unit.

[0079] In one optional embodiment, a filter device is provided between the fresh air inlet of the main unit 1 and the first heater 3, and / or, a filter device is provided at the heat exchanger 4, and / or, a filter device is provided at the air outlet of the main unit 1, for filtering fresh air, mixed air or supplied air to improve indoor air quality.

[0080] A fan can also be installed in the main unit 1 to control the rate and flow of air entering the room and maintain stable indoor air pressure.

[0081] Secondly, such as Figure 2 As shown, one embodiment of the control method for an air conditioning system proposed in this application corresponds to the air conditioning system described in the first aspect. The method includes:

[0082] S1. Return air enters the return air handling unit 2 through the indoor return air inlet, and after heat exchange treatment by the return air handling unit 2, it enters the main unit 1 through the return air outlet.

[0083] S2. Fresh air enters the main unit 1 through the fresh air inlet of the main unit 1;

[0084] S3. The heat-exchange fresh air enters the return air handling unit 2, exchanges heat with the indoor return air entering the return air handling unit 2, and is then discharged.

[0085] S4, the return air passing through the return air processing unit 2 enters the main unit 1 and mixes with the fresh air entering the main unit 1 to obtain mixed air;

[0086] S5, the mixed air is treated by the heat exchanger to obtain supply air, and the supply air is sent into the room through the supply air outlet of the main unit 1;

[0087] S6, obtaining the temperature and humidity of the fresh air, the temperature and humidity of the return air entering the return air processing unit 2, the temperature of the mixed air, the temperature and humidity of the supply air, a preset temperature threshold value, and a humidity threshold value;

[0088] S7, determining the system working mode based on the return air temperature and the temperature threshold value;

[0089] S8, controlling the working mode of the return air processing unit 2 and the main unit 1 according to the system working mode, the temperature and humidity of the fresh air, the temperature and humidity of the return air, the temperature of the mixed air, the temperature and humidity of the supply air, the preset temperature threshold value, and the humidity threshold value;

[0090] In an optional embodiment, different temperature threshold values and humidity threshold values are preset according to different requirements of different spaces. For example, the temperature threshold value of the converter hall can be set to 10-35℃ or 10-26℃, the upper limit value Tmax of the temperature threshold value in the normal working mode is 35℃, and the lower limit value Tmin is 10℃, the upper limit value of the temperature threshold value in the maintenance working mode is 26℃, and the lower limit value is 10℃, and the humidity threshold value can be set to 10-50%.

[0091] In a preferred embodiment, determining the system working mode based on the return air temperature T2 and the temperature threshold value specifically includes:

[0092] a first temperature difference ΔT1 is preset, the first temperature difference ΔT1 is greater than 0℃,

[0093] if T2 < Tmin-ΔT1, the central control unit controls the system to enter the heating mode;

[0094] if Tmin-ΔT1≤T2 < Tmin, the central control unit controls the system to enter the standby mode;

[0095] if T2 > Tmin, the central control unit controls the system to enter the cooling mode.

[0096] In specific implementation, ΔT1 can be set to the required temperature value according to different temperature requirements. For example, in this embodiment, ΔT1 is set to 0.5℃.

[0097] In a preferred embodiment, the central control unit controls the working mode of the main unit 1, including controlling the working mode of the fan 9, specifically including:

[0098] The central control unit acquires the fresh air temperature T1 and the fresh air humidity RH1 obtained by the first temperature and humidity sensing unit 11, calculates the fresh air dew point temperature LD1, and presets a second temperature difference AT2, which is greater than 0℃, a first fan condition temperature, a second fan condition temperature and a third fan condition temperature, a first fan frequency, a second fan frequency and a third fan frequency, wherein the first fan condition temperature is greater than the second fan condition temperature, the first fan frequency is greater than the second fan frequency, and the second fan frequency is greater than the third fan frequency,

[0099] If LD1 < T2- AT2 and T2 > Tmax, the central control unit turns on the fan 9, and the fan frequency is the first fan frequency;

[0100] If LD1 < T2- AT2 and Tmin≤ T2≤ Tmax,

[0101] When T2≥ the first fan condition temperature, the central control unit turns on the fan 9, and the fan frequency is the second fan frequency;

[0102] When the second fan condition temperature≤ T2< the first fan condition temperature, the central control unit turns on the fan 9, and the fan frequency is the third fan frequency;

[0103] When T2< the second fan condition temperature, the central control unit turns off the fan 9.

[0104] Exemplarily, in the present embodiment, the second temperature difference AT2 is set to 2℃, the first fan condition temperature is set to 0.6*(Tmin+Tmax), the second fan condition temperature is set to 0.5*(Tmin+Tmax), the first fan frequency is set to 100%, the second fan frequency is set to The third fan frequency is set to 30%, wherein Tmax is the upper limit value of the temperature threshold, and Tmin is the lower limit value of the temperature threshold.

[0105] In a preferred embodiment, the central control unit controls the working mode of the main unit 1, including controlling the working mode of the fan 9, specifically including:

[0106] When T1 > Ts and RH1 < RHs, if the fan 9 is turned on at this time, the central control unit turns on the spraying assembly 7;

[0107] When T1 < Ts and / or RH1 > RHs, the central control unit closes the spray assembly 7.

[0108] Exemplarily, in the present embodiment, the spray condition temperature is preset to 10℃, and the spray condition humidity is preset to 80%.

[0109] In an alternative preferred embodiment, when the working mode is the heating mode, the central control unit further controls the working mode of the first heater 3 according to the mixed air temperature T3, specifically comprising:

[0110] The first heating condition temperature Th1, the second heating condition temperature Th2, the third heating condition temperature Th3, the fourth heating condition temperature Th4, and the fifth heating condition temperature Th5 are preset, and the first heating power W1, the second heating power W2, the third heating power W3, the fourth heating power W4, and the fifth heating power W5 are preset, wherein Th1 > Th2 > Th3 > Th4 > Th5, and W1 < W2 < W3 < W4 < W5.

[0111] If T3 < Th1, the central control unit turns on the first heater 3 with the power of W1;

[0112] If Th1 ≤ T3 < Th2, the central control unit turns on the first heater 3 with the power of W2;

[0113] If Th2 ≤ T3 < Th3, the central control unit turns on the first heater 3 with the power of W3;

[0114] If Th3 ≤ T3 < Th4, the central control unit turns on the first heater 3 with the power of W4;

[0115] If Th4 ≤ T3 < Th5, the central control unit turns on the first heater 3 with the power of W5;

[0116] If Th5 ≤ T3, the central control unit closes the first heater 3.

[0117] In the implementation, the working power of the first heater 3 under different temperature gradients can be set according to specific conditions and requirements.

[0118] In a preferred embodiment, the central control unit controls the working mode of the heat exchanger 4 based on the working mode, the return air temperature T2, and the return air humidity RH2, specifically comprising:

[0119] When the system working mode is the cooling mode,

[0120] When T2>Tmax, the central control unit controls the chilled water to flow into the heat exchanger 4, the chilled water flow is set to the preset maximum flow, the chilled water temperature is set to the preset minimum temperature, and the mixed air is cooled.

[0121] When Tmin

[0122] If RH2> RHmin, the central control unit controls the heat exchanger 4 to increase the chilled water temperature on the basis of the current chilled water temperature and / or to reduce the chilled water flow on the basis of the current chilled water flow.

[0123] If RH2< RHmin, the central control unit controls the heat exchanger 4 to decrease the chilled water temperature on the basis of the current chilled water temperature and / or to increase the chilled water flow on the basis of the current chilled water flow.

[0124] If RHmin < RH2 < RHmax, the central control unit controls the heat exchanger 4 to keep the chilled water temperature and flow unchanged.

[0125] When the system working mode is the heating mode, the central control unit controls the hot water to flow into the heat exchanger 4, and the mixed air is heat-exchanged.

[0126] In an alternative preferred embodiment, the central control unit further controls the working mode of the second heater 5, specifically including,

[0127] A maximum supply air temperature difference ATmax is preset, and the central control unit calculates the supply air temperature difference AT based on the maximum supply air temperature difference.

[0128] When the system working mode is the heating mode, the central control unit starts the second heater 5 to heat the mixed air, so that the final supply air temperature T4 = T2- AT. In specific implementation, the supply air temperature difference AT can be calculated by the following formula:

[0129]

[0130] In an alternative preferred embodiment, the central control unit further controls the working mode of the humidifier 5, specifically including, a preset supply air condition humidity RHm,

[0131] When RH2< RHmin, the central control unit starts the humidifier 6 to humidify the mixed air, so that RHmin < RH2 < RHmin + RHm.

[0132] In a specific implementation, the RHm is set according to the humidity in the room, and in this embodiment, for example, RHmin+RHm≤90%.

[0133] Obviously, the above embodiments of the present application are only examples for clearly illustrating the technical solutions of the present application, and are not intended to limit the specific implementation of the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection of the claims of the present application.

Claims

1. An air conditioning system control method characterized by, The system comprises a central control unit, a main unit group and a return air processing unit group, The main unit group comprises a heat exchanger electrically connected to the central control unit, and the heat exchanger is further connected to an air conditioning unit group; the return air processing unit group comprises an air heat exchanger for heat exchange treatment of indoor return air; The method comprises: Fresh air enters the main unit group through a fresh air inlet of the main unit group; The heat exchanged fresh air enters the air heat exchanger, and the indoor return air entering the return air processing unit group is heat exchanged and discharged; The return air enters the return air processing unit group through an indoor return air inlet, and after heat exchange treatment by the air heat exchanger, the return air enters the main unit group through a return air outlet; The return air after heat exchange treatment enters the main unit group and mixes with the fresh air entering the main unit group to obtain mixed air; The mixed air is heat exchanged by the heat exchanger to obtain supply air, and the supply air is sent into the room through a supply air outlet of the main unit group; Obtain the temperature and humidity of the fresh air, the temperature and humidity of the return air entering the return air processing unit group, the temperature of the mixed air, the temperature and humidity of the supply air, a preset temperature threshold value and a humidity threshold value; Determine the system working mode based on the return air temperature and the temperature threshold value; Control the working mode of the return air processing unit group and the main unit group according to the system working mode, the temperature and humidity of the fresh air, the temperature and humidity of the return air, the temperature of the mixed air, the temperature and humidity of the supply air, the preset temperature threshold value and the humidity threshold value.

2. The air conditioning system control method of claim 1, wherein The determination of the system working mode based on the return air temperature and the temperature threshold value specifically comprises: A first temperature difference is preset, and the first temperature difference is greater than 0℃, If the return air temperature is less than the difference between the lower limit value of the temperature threshold value and the first temperature difference, the central control unit controls the system to enter a heating mode; If the return air temperature is greater than or equal to the difference between the lower limit value of the temperature threshold value and the first temperature difference, and is less than the lower limit value of the temperature threshold value, the central control unit controls the system to enter a standby mode; If the return air temperature is greater than or equal to the lower limit value of the temperature threshold value, the central control unit controls the system to enter a cooling mode.

3. The air conditioning system control method of claim 2, wherein The main unit group further comprises a first heater, a second heater and a humidifier, wherein the fresh air after entering the main unit group through the fresh air inlet first passes through the first heater and then mixes with the return air processed by the return air processing unit group to obtain the mixed air; the mixed air passes through the heat exchanger, the second heater and the humidifier in sequence to reach the supply air outlet of the main unit group; The return air processing unit group further comprises a spraying assembly and a fan, the spraying assembly is used for heat exchange treatment of heat exchanged fresh air, and the heat exchanged fresh air is used for heat exchange of indoor return air after passing through the spraying assembly; the fan is used for discharging the heat exchanged fresh air after heat exchange of indoor return air.

4. The air conditioning system control method of claim 3, wherein The control of the working mode of the return air processing unit group comprises control of the working mode of the fan, and specifically comprises: When the system working mode is the cooling mode, the central control unit calculates a fresh air dew point temperature based on the fresh air temperature and the fresh air humidity, and presets a second temperature difference, the second temperature difference being greater than 0℃, a first fan condition temperature and a second fan condition temperature, a first fan frequency, a second fan frequency and a third fan frequency, wherein the first fan condition temperature is greater than the second fan condition temperature, the first fan frequency is greater than the second fan frequency, and the second fan frequency is greater than the third fan frequency; If the fresh air dew point temperature is less than a difference between the return air temperature and the second temperature difference, and the return air temperature is greater than an upper limit value of a temperature threshold, the central control unit starts the fan, and the fan frequency is the first fan frequency; If the fresh air dew point temperature is less than a difference between the return air temperature and the second temperature difference, and the return air temperature is within the temperature threshold, when the return air temperature is greater than or equal to the first fan condition temperature, the central control unit starts the fan, and the fan frequency is the second fan frequency; When the return air temperature is greater than or equal to the second fan condition temperature and less than the first fan condition temperature, the central control unit starts the fan, and the fan frequency is the third fan frequency; When the return air temperature is less than the second fan condition temperature, the central control unit stops the fan.

5. The air conditioning system control method of claim 3, wherein, The working mode of the return air fan unit is controlled, including the working mode of the spraying assembly, specifically including: a spraying condition temperature and a spraying condition humidity are preset; When the fresh air temperature is greater than or equal to the spraying condition temperature, and the fresh air humidity is less than the spraying condition humidity, if the fan is started at this time, the central control unit starts the spraying assembly; When the fresh air temperature is less than the spraying condition temperature, and / or the fresh air humidity is greater than the spraying condition humidity, the central control unit stops the spraying assembly.

6. The air conditioning system control method of claim 3, wherein The working mode of the main unit is controlled, including the working mode of the first heater, specifically including: a first heating condition temperature, a second heating condition temperature, a third heating condition temperature, a fourth heating condition temperature and a fifth heating condition temperature are preset, and the preset values are sequentially increased, a first heating power, a second heating power, a third heating power, a fourth heating power and a fifth heating power are preset, and the preset values are sequentially decreased, When the system working mode is the heating mode, If the mixed air temperature is less than the first heating condition temperature, the central control unit starts the first heater, and the power is the first heating power; If the mixed air temperature is greater than or equal to the first heating condition temperature and less than the second heating condition temperature, the central control unit starts the first heater, and the power is the second heating power; If the mixed air temperature is greater than or equal to the second heating condition temperature and less than the third heating condition temperature, the central control unit starts the first heater, and the power is the third heating power; If the mixed air temperature is greater than or equal to the third heating condition temperature and less than the fourth heating condition temperature, the central control unit starts the first heater, and the power is the fourth heating power; If the mixed air temperature is greater than or equal to the fourth heating condition temperature and less than the fifth heating condition temperature, the central control unit turns on the first heater at a fifth heating power; If the mixed air temperature is greater than or equal to the fifth heating condition temperature, the central control unit turns off the first heater.

7. The air conditioning system control method of claim 3, wherein, The control of the working mode of the host group includes the control of the working mode of the heat exchanger, specifically including: When the system working mode is the cooling mode, When the return air temperature is greater than the upper limit of the temperature threshold, the central control unit controls the heat exchanger to pass in chilled water, sets the chilled water flow to the maximum flow, sets the chilled water temperature to the preset minimum temperature, and performs cooling processing on the mixed air; When the return air temperature drops to the temperature threshold, the working mode of the heat exchanger is further controlled according to the return air humidity, specifically including: If the return air humidity is greater than the lower limit of the humidity threshold, the central control unit controls the heat exchanger to increase the chilled water temperature on the basis of the current chilled water temperature and / or reduce the chilled water flow on the basis of the current chilled water flow; If the return air humidity is less than the lower limit of the humidity threshold, the central control unit controls the heat exchanger to decrease the chilled water temperature on the basis of the current chilled water temperature and / or increase the chilled water flow on the basis of the current chilled water flow; If the return air humidity is within the humidity threshold, the chilled water temperature and flow in the heat exchanger remain unchanged; When the system working mode is the heating mode, the central control unit controls the heat exchanger to pass in hot water to perform heat exchange processing on the mixed air.

8. The air conditioning system control method of claim 3, wherein, The control of the working mode of the host group also includes the control of the working mode of the second heater, specifically including: A maximum supply air temperature difference is preset, and a supply air temperature difference is calculated based on the maximum supply air temperature difference, When the system working mode is the heating mode, the central control unit turns on the second heater to heat the mixed air, so that the temperature difference between the final supply air temperature and the return air temperature remains the supply air temperature difference.

9. The air conditioning system control method of claim 8, wherein, The supply air temperature difference calculated based on the maximum supply air temperature difference is represented as:

10. The air conditioning system control method according to any one of claims 3 to 9, characterized by, The control of the working mode of the host group includes the control of the working mode of the humidifier, specifically including: A supply air condition humidity is preset; When the return air humidity is less than the lower limit of the humidity threshold, the central control unit turns on the humidifier to humidify the mixed air, so that the supply air humidity is greater than the lower limit of the humidity threshold and less than or equal to the sum of the lower limit of the humidity threshold and the supply air condition humidity.

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