A temperature and humidity control method, air conditioning unit and storage medium

Abstract

The present invention discloses a temperature and humidity control method, an air conditioning unit and a storage medium. The method comprises: 设 And the corresponding relative humidity setting value φ 设 Determine the moisture content setpoint d 设 , the air conditioning unit starts to operate in cooling mode; according to the first return air temperature value T of the first heat exchanger 1 And the first return air relative humidity value φ 1 , determine the first return air humidity d of the first indoor heat exchanger 1 , and according to the second return air temperature value T of the second heat exchanger 2 And the second return air relative humidity value φ 2 , determine the second return air humidity d of the second heat exchanger 2 According to the first return air humidity d 1 , the first return air temperature value T 1 , Second return air humidity d 2 With the temperature setting value T 设 and moisture content setpoint d 设 , adjust the operating state of the indoor unit. The present invention adopts an air energy heat pump device to adjust temperature and humidity, with high energy efficiency and energy saving. The moisture content is used as a control index, and the control is direct, fast and accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a temperature and humidity control method, an air conditioning unit and a storage medium. Background Art

[0002] In the temperature and humidity control of the existing constant temperature and humidity units, the humidity control index is relative humidity, and the relative humidity changes with the temperature regulated by the unit, so the humidity control accuracy is low and is usually in a released state.

[0003] The control principle of the unit is cooling to cool and dehumidify, electric heating to increase temperature and reduce relative humidity, and humidifier to increase relative humidity. Figure 3 The system diagram of the existing constant temperature and humidity unit is shown in FIG. The components of the unit include a heat exchanger 7, an electric heater 10, and a humidifier 6. In the process of controlling the temperature and humidity, the unit operates in a cooling mode, and the heat exchanger 7 is used to cool and dehumidify. Furthermore, the electric heater 10 is used to adjust the temperature to meet the temperature requirements, and the humidifier 6 is used to adjust the humidity requirements. In this process, there is a serious problem of energy waste in that the cooling and electric heating cold and heat offset each other, and the dehumidification and humidification offset each other. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art in which electric heating and humidifier humidification cancel each other out, resulting in great energy waste, and relative humidity being affected by temperature, with low control accuracy and unstable control as a control indicator, as well as long feedback time and slow adjustment speed through temperature and humidity feedback adjustment, the purpose of the present invention is to provide a temperature and humidity control method, air-conditioning unit and storage medium, which adopts an air energy heat pump device to replace electric heating temperature adjustment, and adopts moisture content to replace relative humidity as a humidity control indicator, so that the control is more accurate and rapid, the actual required moisture content is calculated, the temperature and humidity are controlled, and the adjustment is rapid.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a temperature and humidity control method, comprising:

[0006] S1: Detect the user's temperature setting value T 设 And the corresponding relative humidity setting value φ 设 , the air conditioning unit starts to operate in cooling mode, and the temperature setting value T 设 The relative humidity set value is input into the humid air enthalpy and humidity database, and the moisture content set value d is output. 设 ;

[0007] S2: Real-time detection of the first return air temperature value T1 and the first return air relative humidity value φ1 of the first indoor heat exchanger, and real-time detection of the second return air temperature value T2 and the first return air relative humidity value φ2 of the second indoor heat exchanger;

[0008] S3: determining a first return air humidity d1 of the first indoor heat exchanger according to the first return air temperature value T1 and the first return air relative humidity value φ1, and determining a second return air humidity d2 of the second heat exchanger according to the second return air temperature value T2 and the second return air relative humidity value φ2;

[0009] S4: According to the first return air humidity d1, the first return air temperature value T1, the second return air humidity d2 and the temperature setting value T 设 and moisture content setting value d 设 , adjust the operating status of the indoor unit to adjust the indoor temperature and humidity;

[0010] Among them, the first return air temperature value T1 and the first return air relative humidity value φ1 are detected according to a first temperature and humidity sensor installed on the return air side of the first heat exchanger, and the second return air temperature value T2 and the second return air relative humidity value φ2 are detected according to a second temperature and humidity sensor installed between the outlet side of the first heat exchanger and the return air side of the second heat exchanger.

[0011] As a further improvement of the present invention: the indoor unit includes a first heat exchanger, a second heat exchanger and a humidifier, a first electronic expansion valve is provided between the first heat exchanger and the outdoor heat exchanger, and a second electronic expansion valve is provided between the second heat exchanger and the outdoor heat exchanger, and the step S4 includes:

[0012] If the first return air humidity d1 and humidity setting value d 设 The relationship is d1>d 设 +△d, adjust the opening of the first electronic expansion valve so that the detected second return air humidity d2 reaches the humidity setting value d 设 ;

[0013] And at the same time adjust the opening of the second electronic expansion valve so that the detected first return air temperature value T1 reaches the temperature setting value T 设 After that, the air conditioning unit is controlled to run for the preset time t.

[0014] As a further improvement of the present invention: the opening of the second electronic expansion valve is adjusted so that the detected first return air temperature value T1 reaches the temperature setting value T 设 After that, the air conditioning unit is controlled to run for a preset time t including:

[0015] When the first return air temperature value T1 is not less than the temperature setting value T 设 When +△T, reduce the opening of the second electronic expansion valve;

[0016] When the first return air temperature value T1 is less than the temperature setting value T 设 -△T, increase the opening of the second electronic expansion valve;

[0017] Wherein, the opening degree of the second electronic expansion valve is greater than the opening degree of the first electronic expansion valve.

[0018] As a further improvement of the present invention: the step S4 further includes:

[0019] If the first return air humidity d1 and humidity setting value d 设 The relationship is d1 <d 设 -△d, the humidifier is controlled to open so that the first return air humidity d1 meets d 设 -△d≤d1≤d 设 +△d;

[0020] And simultaneously adjust the opening of the first electronic expansion valve and the second electronic expansion valve so that the detected first return air temperature value T1 reaches the temperature setting value T 设 After that, the air conditioning unit is controlled to run for the preset time t.

[0021] As a further improvement of the present invention: the step S4 further includes:

[0022] When the first return air humidity d1 is equal to the humidity setting value d 设 The relationship is d 设 -△d≤d1≤d 设 +△d, if the first return air temperature value T1 and the temperature setting value T 设 The relationship is T1>T 设 +△T;

[0023] Synchronously adjust the opening of the first electronic expansion valve and the second electronic expansion valve so that the first return air temperature value T1 satisfies T 设 After that, the air conditioning unit is controlled to run for the preset time t.

[0024] Wherein, the opening degrees of the first electronic expansion valve and the second electronic expansion valve are the same.

[0025] As a further improvement of the present invention: the step S4 further includes:

[0026] When the first return air humidity d1 is equal to the humidity setting value d 设 The relationship is d 设 -△d≤d1≤d 设 +△d,

[0027] If the first return air temperature value T1 satisfies T1<T 设 -△T, the air conditioning unit operates in heating mode, and the opening of the first electronic expansion valve and the second electronic expansion valve are adjusted synchronously to make the first return air temperature value T1 reach the temperature setting value T 设 After that, the air conditioning unit is controlled to run for the preset time t.

[0028] The first electronic expansion valve and the second electronic expansion valve have the same opening degree.

[0029] As a further improvement of the present invention: the step S4 further includes:

[0030] When the first return air humidity d1 is equal to the humidity setting value d 设 The relationship is d 设 -△d≤d1≤d 设 +△d;

[0031] If the first return air temperature value T1 satisfies T 设 -△T≤T1≤T 设 +△T, the air conditioning unit is controlled to maintain the current operating state for the preset time t.

[0032] The current operating state includes maintaining the openings of the first electronic expansion valve and the second electronic expansion valve unchanged.

[0033] As a further improvement of the present invention: the humidification amount d output by the humidifier is d 设 -d1.

[0034] The present invention also provides an air conditioning unit, comprising the temperature and humidity control method described above.

[0035] The present invention also provides a computer storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed, the above-mentioned temperature and humidity control method can be implemented.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] The present invention adopts an air energy heat pump device to replace electric heating temperature control and adopts moisture content to replace relative humidity as the humidity control index. By calculating the actual required moisture content and adopting an air energy heat pump device, the adjustment is fast, the energy efficiency is high, energy is saved, the control is more precise and fast, humidity is given priority during the adjustment process, and the indoor temperature and humidity are independently controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a control flow diagram of the present invention.

[0039] Figure 2 It is a schematic diagram of the principle of the temperature and humidity independent control system of the present invention.

[0040] Figure 3 It is a schematic diagram of the principle of the constant temperature and humidity unit system in the prior art.

[0041] The reference numerals are: 1. first heat exchanger, 2. second heat exchanger, 3. outdoor heat exchanger, 4. first electronic expansion valve, 5. second electronic expansion valve, 6. humidifier, 7. first temperature and humidity sensor, 8. second temperature and humidity sensor, 9. compressor, 10. electric heater. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0043] In order to solve the technical problems in the prior art, the present invention is further described in conjunction with the accompanying drawings and embodiments:

[0044] like Figure 1-Figure 2 As shown, the present invention discloses a temperature and humidity control method, comprising:

[0045] S1: Detect the user's temperature setting value T 设 And the corresponding relative humidity setting value φ 设 , the air conditioning unit starts to operate in cooling mode, and the temperature setting value T 设 The relative humidity set value is input into the humid air enthalpy and humidity database, and the moisture content set value d is output. 设 ;

[0046] Among them, the air-conditioning unit includes an indoor unit and an outdoor unit, the indoor unit includes a first heat exchanger 1, a second heat exchanger 2, a humidifier 6 and a fan (not shown in the figure), and the outdoor unit includes an outdoor heat exchanger 3, a four-way valve, a compressor, a gas-liquid separator and a heat exchange fan. A first electronic expansion valve 4 is provided on the pipeline between the first heat exchanger 1 and the outdoor heat exchanger 3, and a second electronic expansion valve 5 is provided on the pipeline between the second heat exchanger 2 and the outdoor heat exchanger 3. The air outlet of the first heat exchanger 1 is connected to the return air outlet of the second heat exchanger 2.

[0047] The first heat exchanger 1 is also connected to the compressor 9 through a four-way valve, and the second heat exchanger 2 is also connected to the compressor 9 through a four-way valve. The indoor unit is installed indoors, and the outdoor unit is installed outdoors.

[0048] It should also be noted that the wet air enthalpy humidity database is a correspondence between temperature values, relative humidity values ​​and moisture content values ​​pre-stored in the air-conditioning unit. Each set of temperature values ​​and relative humidity values ​​corresponds to a moisture content value, that is, by directly inputting the temperature value and relative humidity value, the corresponding moisture content value can be directly checked.

[0049] S2: Real-time detection of the first return air temperature value T1 and the first return air relative humidity value φ1 of the first indoor heat exchanger, and real-time detection of the second return air temperature value T2 and the first return air relative humidity value φ2 of the second indoor heat exchanger;

[0050] It should be noted that in step S2, the first return air temperature value T1 and the first return air relative humidity value φ1 of the first heat exchanger feed back the real-time temperature value and relative humidity value of the indoor closed space where the air-conditioning unit is located.

[0051] S3: determining a first return air humidity d1 of the first indoor heat exchanger according to the first return air temperature value T1 and the first return air relative humidity value φ1, and determining a second return air humidity d2 of the second heat exchanger according to the second return air temperature value T2 and the second return air relative humidity value φ2;

[0052] The first return air humidity content d1 and the second return air humidity content d2 can be obtained by querying the humid air enthalpy humidity database.

[0053] S4: According to the first return air humidity d1, the first return air temperature value T1, the second return air humidity d2 and the temperature setting value T 设 and moisture content setting value d 设 , adjust the operating status of the indoor unit to adjust the indoor temperature and humidity;

[0054] Among them, the first return air temperature value T1 and the first return air relative humidity value φ1 are detected according to the first temperature and humidity sensor 7 installed on the return air side of the first heat exchanger 1, and the second return air temperature value T2 and the second return air relative humidity value φ2 are detected according to the second temperature and humidity sensor 8 installed between the outlet side of the first heat exchanger 1 and the return air side of the second heat exchanger 2.

[0055] Specifically, the first temperature and humidity sensor 7 detects the temperature T1 and relative humidity φ1 of the return air from the air-conditioning area (the return air from the first heat exchanger), and the second temperature and humidity sensor 8 detects the temperature T2 and relative humidity φ2 of the return air from the air-conditioning area after passing through the first heat exchanger 1 .

[0056] The present invention can judge the temperature and humidity adjustment requirements of the air-conditioned area at this time by comparing the temperature and humidity set by the user with the temperature and humidity of the air-conditioned area (the return air side of the first indoor heat exchanger). In the prior art, since the relative humidity is affected by the temperature adjustment, the two changes are used as control indicators at the same time, which is not conducive to fast and accurate control. Therefore, the present invention adopts the moisture content as the humidity control indicator and adopts the humidity priority control principle. The first heat exchanger is used for humidity control and the second heat exchanger is used for temperature control.

[0057] As a preferred embodiment of the present invention, step S4 specifically includes:

[0058] If the first return air humidity d1 and humidity setting value d 设 The relationship is d1>d 设 +△d, adjust the opening of the first electronic expansion valve so that the detected second return air humidity d2 reaches the humidity setting value d 设 ;

[0059] And at the same time adjust the opening of the second electronic expansion valve so that the detected first return air temperature value T1 reaches the temperature setting value T 设 After that, the air conditioning unit is controlled to run for the preset time t.

[0060] That is to say, if the air humidity d1 in the air conditioning area is higher than the humidity d 设 , that is, d1>d 设 +△d (△d is the control accuracy), it is determined that the air-conditioned area is in a high humidity state and needs to be dehumidified quickly. At this time, the unit is running for cooling and adjusts the opening of the first electronic expansion valve so that the return air passes through the first heat exchanger to be cooled and dehumidified. The moisture content after dehumidification is the moisture content set by the user d2 = d 设 Furthermore, the opening of the second electronic expansion valve is adjusted so that the temperature after passing through the second heat exchanger meets the user's set requirements.

[0061] As a more preferred embodiment of the present invention, the opening of the second electronic expansion valve is adjusted so that the detected first return air temperature value T1 reaches the temperature setting value T 设 After that, the air conditioning unit is controlled to run for a preset time t including:

[0062] When the first return air temperature value T1 is not less than the temperature setting value T 设 When +△T, reduce the opening of the second electronic expansion valve;

[0063] When the first return air temperature value T1 is less than the temperature setting value T 设 -△T, increase the opening of the second electronic expansion valve;

[0064] Wherein, the opening degree of the second electronic expansion valve is greater than the opening degree of the first electronic expansion valve.

[0065] d1>d 设 +△d, the opening of the second electronic expansion valve is greater than that of the first electronic expansion valve, ensuring that the moisture content of the air does not change when passing through the second heat exchanger, and at this time the second heat exchanger can further cool or heat the air according to actual needs. When the second electronic expansion valve is less than a certain opening, the second heat exchanger is in a cooling state and can further cool the air. When the second electronic expansion valve is greater than a certain opening, the second heat exchanger is equivalent to a part of the unit condenser and can heat the air.

[0066] As a preferred embodiment of the present invention, the step S4 further includes: if the first return air humidity content d1 is equal to the humidity content setting value d 设 The relationship is d1 <d 设 -△d, the humidifier is controlled to open so that the first return air humidity d1 meets d 设 -△d≤d1≤d 设 +△d;

[0067] And simultaneously adjust the opening of the first electronic expansion valve and the second electronic expansion valve so that the detected first return air temperature value T1 reaches the temperature setting value T 设 After that, the air conditioning unit is controlled to run for the preset time t.

[0068] That is to say, the air humidity in the air-conditioning area is lower than the humidity in the air-conditioning area set by the user. 设 , that is, d1<d 设 -△d (△d is the control accuracy), the air-conditioned area is judged to be dry at this time, and the humidifier is turned on at this time, and the humidification amount is d=d 设 -d1. If the air humidity in the air conditioning area d1 is between the humidity in the air conditioner set by the user 设 Within the adjustment accuracy range, i.e. d 设 -△d≤d1≤d 设 +△d (△d is the control accuracy), then it is determined that the humidity in the air-conditioned area does not need to be adjusted at this time. Further determine the temperature adjustment needs.

[0069] The specific temperature adjustment is as follows:

[0070] As a more preferred embodiment of the present invention, the step S4 further includes:

[0071] When the first return air humidity d1 is equal to the humidity setting value d 设 The relationship is d 设 -△d≤d1≤d 设 +△d, if the first return air temperature value T1 and the temperature setting value T 设 The relationship is T1>T 设 +△T;

[0072] The opening of the first electronic expansion valve and the second electronic expansion valve are adjusted synchronously to reduce so that the first return air temperature value T1 satisfies T 设 After that, the air conditioning unit is controlled to run for a preset time t;

[0073] Wherein, the opening degrees of the first electronic expansion valve and the second electronic expansion valve are the same.

[0074] That is to say, if the air temperature T1 in the air-conditioning area is higher than the user-set temperature T 设 , that is, T1>T 设 +△T (△T is the control accuracy), it is determined that the air-conditioned area is in a high temperature state and needs to be cooled down quickly. At this time, the unit operates in cooling mode and adjusts the opening of the first electronic expansion valve and the second electronic expansion valve to be smaller, so that the air is cooled but not dehumidified after passing through the second heat exchanger, and the adjusted temperature meets the user's set requirements.

[0075] As a more preferred embodiment of the present invention, the step S4 further includes: when the first return air humidity content d1 is equal to the humidity content setting value d 设 The relationship is d 设 -△d≤d1≤d 设 +△d,

[0076] If the first return air temperature value T1 satisfies T1<T 设 -△T, the whole unit is running in heating mode, and the opening of the first electronic expansion valve and the second electronic expansion valve are adjusted synchronously to make the first return air temperature value T1 reach the temperature setting value T 设 Afterwards, the air conditioning unit is controlled to run for a preset time t, wherein the opening degrees of the first electronic expansion valve and the second electronic expansion valve are the same.

[0077] That is to say, if the air temperature T1 in the air-conditioning area is lower than the user-set temperature T 设 , that is, T1 <T 设 -△T (△T is the control accuracy), it is determined that the air-conditioned area is in a low temperature state and needs to be heated quickly. At this time, the unit is running in heating mode.

[0078] To meet the user's setting requirements, the temperature and humidity can be adjusted to the temperature setting value T 设 And the corresponding relative humidity setting value φ 设 , or adjust the temperature and humidity to the temperature setting value T 设 And the corresponding relative humidity setting value φ 设 Within the preset range, that is, T1 satisfies T 设 -△T≤T1≤T 设 +△T, moisture content setting value d 设 Satisfy 设 -△d≤d1≤d 设 +△d.

[0079] As a more preferred embodiment of the present invention, the step S4 further includes:

[0080] When the first return air humidity d1 is equal to the humidity setting value d 设 The relationship is d 设 -△d≤d1≤d 设 +△d;

[0081] If the first return air temperature value T1 satisfies T 设 -△T≤T1≤T 设 +△T, the air conditioning unit is controlled to maintain the current operating state for the preset time t.

[0082] The current operating state includes maintaining the openings of the first electronic expansion valve and the second electronic expansion valve unchanged.

[0083] That is to say, if the air temperature T1 of the air conditioning area is between the user set temperature T 设 Within the adjustment accuracy range, that is, T 设 -△T≤T1≤T 设 +△T (△T is the control accuracy), it is determined that the temperature of the air-conditioned area does not need to be adjusted at this time, and the unit maintains the current operating state.

[0084] In order to avoid frequent operation of the unit's various regulating components, after each temperature and humidity adjustment is completed, the unit continues to run for a preset time t, and then recycles to determine the temperature and humidity control needs of the air-conditioned area.

[0085] Based on the same inventive concept, the present invention also discloses an air conditioning unit, including using the temperature and humidity control method described above.

[0086] Based on the same inventive concept, the present invention also discloses a computer storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed, the above-mentioned temperature and humidity control method can be implemented.

[0087] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A temperature and humidity control method, characterized in that: The indoor unit includes a first heat exchanger, a second heat exchanger and a humidifier, the first heat exchanger and the second heat exchanger are arranged in parallel, a first electronic expansion valve is arranged between the first heat exchanger and the outdoor heat exchanger, a second electronic expansion valve is arranged between the second heat exchanger and the outdoor heat exchanger, and an air outlet of the first heat exchanger is connected to an air return outlet of the second heat exchanger; the control method includes: S1: Detect the user's temperature setting value T 设 And the corresponding relative humidity setting value φ 设 , the air conditioning unit starts to operate in cooling mode, and the temperature setting value T 设 The relative humidity set value is input into the humid air enthalpy and humidity database, and the moisture content set value d is output. 设 ; S2: Real-time detection of the first return air temperature value T1 and the first return air relative humidity value φ1 of the first indoor heat exchanger, and real-time detection of the second return air temperature value T2 and the first return air relative humidity value φ2 of the second indoor heat exchanger; S3: determining a first return air humidity d1 of the first indoor heat exchanger according to the first return air temperature value T1 and the first return air relative humidity value φ1, and determining a second return air humidity d2 of the second heat exchanger according to the second return air temperature value T2 and the second return air relative humidity value φ2; S4: According to the first return air humidity d1, the first return air temperature value T1, the second return air humidity d2 and the temperature setting value T 设 and moisture content setpoint d 设 , adjust the operating status of the indoor unit to adjust the indoor temperature and humidity; The step S4 comprises: If the first return air humidity d1 and humidity setting value d 设 The relationship is d1>d 设 +△d, adjust the opening of the first electronic expansion valve so that the detected second return air humidity d2 reaches the humidity setting value d 设 ; At the same time, adjust the opening of the second electronic expansion valve so that the detected first return air temperature value T1 reaches the temperature setting value T 设 After that, the air conditioning unit is controlled to run for a preset time t; Among them, the first return air temperature value T1 and the first return air relative humidity value φ1 are detected according to a first temperature and humidity sensor installed on the return air side of the first heat exchanger, and the second return air temperature value T2 and the second return air relative humidity value φ2 are detected according to a second temperature and humidity sensor installed between the outlet side of the first heat exchanger and the return air side of the second heat exchanger.

2. A temperature and humidity control method according to claim 1, characterized in that: The opening of the second electronic expansion valve is adjusted so that the detected first return air temperature value T1 reaches the temperature setting value T 设 After that, the air conditioning unit is controlled to run for a preset time t including: When the first return air temperature value T1 is not less than the temperature setting value T 设 When +△T, reduce the opening of the second electronic expansion valve; When the first return air temperature value T1 is less than the temperature setting value T 设 -△T, increase the opening of the second electronic expansion valve; Wherein, the opening degree of the second electronic expansion valve is greater than the opening degree of the first electronic expansion valve.

3. A temperature and humidity control method according to claim 1 or 2, characterized in that: The step S4 further comprises: If the first return air humidity d1 and humidity setting value d 设 The relationship is d1 <d 设 -△d, the humidifier is controlled to open so that the first return air humidity d1 meets d 设 -△d≤d1≤d 设 +△d; And simultaneously adjust the opening of the first electronic expansion valve and the second electronic expansion valve so that the detected first return air temperature value T1 reaches the temperature setting value T 设 After that, the air conditioning unit is controlled to run for the preset time t.

4. A temperature and humidity control method according to claim 3, characterized in that: The step S4 further comprises: When the first return air humidity d1 is equal to the humidity setting value d 设 The relationship is d 设 -△d≤d1≤d 设 +△d, if the first return air temperature value T1 and the temperature setting value T 设 The relationship is T1>T 设 +△T; Synchronously adjust the opening of the first electronic expansion valve and the second electronic expansion valve so that the first return air temperature value T1 satisfies T 设 After that, the air conditioning unit is controlled to run for the preset time t. Wherein, the opening degrees of the first electronic expansion valve and the second electronic expansion valve are the same.

5. A temperature and humidity control method according to claim 4, characterized in that: The step S4 further comprises: When the first return air humidity d1 is equal to the humidity setting value d 设 The relationship is d 设 -△d≤d1≤d 设 +△d, If the first return air temperature value T1 satisfies T1<T 设 -△T, the air conditioning unit operates in heating mode, and the opening of the first electronic expansion valve and the second electronic expansion valve are adjusted synchronously to make the first return air temperature value T1 reach the temperature setting value T 设 After that, the air conditioning unit is controlled to run for the preset time t. Wherein, the opening degrees of the first electronic expansion valve and the second electronic expansion valve are the same.

6. A temperature and humidity control method according to claim 4 or 5, characterized in that: The step S4 further comprises: When the first return air humidity d1 is equal to the humidity setting value d 设 The relationship is d 设 -△d≤d1≤d 设 +△d; If the first return air temperature value T1 satisfies T 设 -△T≤T1≤T 设 +△T, the air conditioning unit is controlled to maintain the current operating state for the preset time t. The current operating state includes maintaining the openings of the first electronic expansion valve and the second electronic expansion valve unchanged.

7. A temperature and humidity control method according to claim 6, characterized in that: The humidification amount d output by the humidifier is d 设 -d1.

8. An air conditioning unit, characterized in that: The method comprises using a temperature and humidity control method as described in any one of claims 1 to 7.

9. A computer storage medium, wherein the computer readable storage medium stores a computer program, characterized in that: When the computer program is executed, a temperature and humidity control method as described in any one of claims 1 to 7 can be implemented.

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