An improved constant temperature and humidity control method

Abstract

The present invention discloses an improved constant temperature and humidity control method. When the heat and humidity load in the room is relatively large, resulting in the temperature after the inner disk reaching the control target while the indoor temperature or humidity is higher than the set target value, the control target value of the temperature after the evaporator of the indoor unit is automatically corrected and reduced to meet the requirements of cooling and dehumidification, thereby achieving the control requirements of constant temperature and humidity. If the heat and humidity load in the room is relatively small, and the temperature after the evaporator of the indoor unit is controlled according to the set temperature and humidity of the room, resulting in excessive cooling and dehumidification, and the heating and humidification compensation is relatively large, causing excessive cold and heat cancellation and dehumidification and humidification cancellation, the control target value of the temperature after the evaporator of the indoor unit is automatically corrected and increased to reduce the output of the variable frequency compressor, heater, and humidifier, thereby reducing the degree of cold and heat cancellation and dehumidification and humidification cancellation, and making the unit operation more energy-efficient.

Description

Technical Field

[0001] The present invention relates to the technical field of air-conditioning control, and particularly to an improved constant temperature and humidity control method. Background Art

[0002] Currently, constant temperature and humidity air-conditioning units are widely used in technological places with requirements for temperature and humidity, such as electronics, medicine, automobiles, mechanical processing purification workshops, precision laboratories, and biological laboratories. The control effect of temperature and humidity has a great impact on whether the technological requirements of constant temperature and humidity are met; at the same time, there is a large amount of energy waste due to the situation of cold and heat offset and dehumidification and humidification offset during the operation of the constant temperature and humidity machine.

[0003] For the control method of constant temperature and humidity under the refrigeration condition of a variable-frequency constant temperature and humidity air-conditioning unit, there are currently mainly two control methods. The first is the dew point supply air temperature control method, that is, under the refrigeration condition, the dew point temperature of the indoor set temperature and humidity is used as the control target to control the temperature after the indoor unit evaporator, and then compensation control is carried out through heating and humidification; the second is to compare the actual indoor temperature and humidity with the set temperature and humidity. When the temperature is low, the compressor unloads and the heater loads; when the temperature is high, the compressor loads and the heater unloads. When the relative humidity or moisture content is high, the compressor loads and the humidifier unloads; when the relative humidity or moisture content is low, the compressor unloads and the humidifier loads.

[0004] The advantage of the first control method is that the compressor only considers controlling the dew point temperature after the indoor coil to control humidity, and then compensation control is carried out through heating and humidification. The control is simple and the system is easy to stably control; the disadvantage is that this control method does not consider the actual heat and moisture load of the room. On the one hand, if the heat and moisture load of the room is large, controlling the temperature after the indoor unit evaporator according to the set temperature and humidity of the room will result in the actual temperature and humidity being too high to reach the control target. On the other hand, if the heat and moisture load of the room is small, controlling the temperature after the indoor unit evaporator according to the set temperature and humidity of the room will result in excessive cooling and dehumidification, and the heating and humidification compensation will be too large, causing excessive cold and heat offset and dehumidification and humidification offset, and the unit operation is not energy-saving.

[0005] The advantage of the second control method is that the actual indoor temperature and humidity are used as the control target, and there will be no situation of deviation in temperature and humidity control existing in the first control method; the disadvantages are that, on the one hand, the temperature control is borne by both the refrigeration compressor and the heater, and the humidity control is borne by both the refrigeration compressor and the humidifier, resulting in the situation of cold and heat offset and dehumidification and humidification offset, and the operation is not energy-saving. On the other hand, the compressor controls both temperature and humidity, the control is complex, and the system is not easy to stably control.

[0006] Therefore, it is necessary to improve the existing constant temperature and humidity control method to better meet the market demand. In view of the above problems, the inventor proposes an improved constant temperature and humidity control method to solve the above problems. Summary of the invention

[0007] In order to improve the existing constant temperature and humidity control method so as to better meet the market demand; the purpose of the present invention is to provide an improved constant temperature and humidity control method.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solution: an improved constant temperature and humidity control method, comprising the following steps:

[0009] S1. Set the required constant temperature and humidity through the setting panel;

[0010] S2, the detection module detects the indoor temperature and humidity parameters, as well as the temperature parameters of the air outlet side of the indoor unit, and transmits the detection parameters to the controller;

[0011] S3. The controller calculates the change of the execution module according to the detected parameters and the design parameters, thereby controlling the operation of the air-conditioning components to adjust the temperature and humidity and realize constant temperature and humidity control.

[0012] In a preferred implementation example, the detection module includes an indoor temperature sensor, an indoor humidity sensor and an outlet temperature sensor, which respectively detect the indoor temperature Tsn, the indoor humidity RHsn and the evaporator outlet temperature Tnp_b, and transmit the data to the controller.

[0013] In a preferred implementation case, the execution module includes a heater, a humidifier and a compressor, the heater and the humidifier are both installed in the indoor unit, the compressor is a built-in compressor of the air conditioner, the heater is one of electric heating, hot water or steam heating coils, the humidifier is one of electrode or electric heating, dry steam isenthalpic humidifiers, and the compressor is a variable frequency compressor.

[0014] In a preferred implementation case, the heater is controlled by a controller and outputs OUTjr according to a pid algorithm; the humidifier is controlled by a controller and outputs OUTjs according to a pid algorithm; the compressor is controlled by a controller and outputs OUTcomp; the setting panel sets the control target values ​​of the indoor temperature Tset and the relative humidity RHset; the controller calculates the set moisture content Dset and the set dew point temperature Tset_d according to the set temperature and relative humidity, and calculates the actual indoor moisture content Dsn according to the actual indoor temperature and relative humidity, so as to control the execution module.

[0015] In a preferred implementation example, in step S3, the controller calculates the output change of the heater according to the following pid algorithm formula:

[0016] ΔOUTjr=Kjr p *(ΔTjrn -ΔTjr n-1 ) + Kjr i *ΔTjr n +Kjr d (ΔTjr n -2*ΔTjr n-1 +ΔTjr n-2 ),

[0017] where Kjr p 、Kjr i 、Kjr d are respectively the PID adjustment coefficients, △Tjr n = Tsn n - Tset, △Tjr n-1 = Tsn n-1 - Tset, △Tjr n-2 = Tsn n-2 - Tset, the subscript n represents the current value, n - 1 represents the value one adjustment cycle before, n - 2 represents the value two adjustment cycles before. When the controller calculates the heater output and controls the heater to work, the heater output calculation formula is OUTjr = OUTjr n-1 + △OUTjr, the subscript n - 1 represents the value one adjustment cycle before, and the range of OUTjr is 0 - 100%.

[0018] In a preferred embodiment, in step S3, the controller calculates the output change of the humidifier according to the following PID algorithm formula:

[0019] ΔOUTjs = Kjs p *(ΔDjs n - ΔDjs n-1 ) + Kjs i *ΔDjs n + Kjs d (ΔDjs n - 2*ΔDjs n-1 + ΔDjs n-2 ),

[0020] where Kjs p 、Kjs i 、Kjs d are respectively the PID adjustment coefficients, △Djs n = Dsn n - Dset, △Djs n-1 = Dsn n-1 - Dset, △Djs n-2 = Dsn n-2-Dset, where the subscript n represents the current value, n - 1 represents the value one adjustment cycle ago, and n - 2 represents the value two adjustment cycles ago. When the controller calculates the output of the humidifier and controls its operation, the calculation formula for the humidifier output is OUTjs = OUTjs n-1 + △OUTjs, where the subscript n - 1 represents the value one adjustment cycle ago, and the range of OUTjs is 0 - 100%.

[0021] In a preferred embodiment, in step S3, the controller calculates the output change of the variable - frequency compressor according to the following pid algorithm formula:

[0022] ΔOUTcomp = Kcomp p *(ΔTcomp n - ΔTcomp n-1 ) + Kcomp i *ΔTcomp n + Kcomp d (ΔTcomp n - 2*ΔTcomp n-1 + ΔTcomp n-2 ),

[0023] where Kcomp p , Kcomp i , Kcomp d are the pid adjustment coefficients respectively, and △Tcomp n = Tnp_b n - Tset_d + D, △Tcomp n-1 = Tnp_b n-1 - Tset_d + D, △Tcomp n-2 = Tnp_b n-2 - Tset_d + D. The subscript n represents the current value, n - 1 represents the value one adjustment cycle ago, and n - 2 represents the value two adjustment cycles ago. D is the variable dew - point temperature adjustment parameter with an initial value of 1K. When the controller calculates the output of the variable - frequency compressor and controls its operation, the calculation formula for the compressor output is OUTcomp = OUTcomp n-1 + △OUTcomp, where the subscript n - 1 represents the value one adjustment cycle ago, and the range of OUTcomp is 0 - 100%.

[0024] In a preferred embodiment, when △Tjr > the temperature control accuracy of 1K, and OUTjr = 0, and Tnp_bn < Tset_d - D, and OUTcomp < 95%, it indicates that the heat load of the room is too large, resulting in the temperature after the inner disk reaching the control target while the indoor temperature is higher than the set target value. Then, the control target value of the temperature after the evaporator of the indoor unit is automatically corrected and reduced, and D = Dn - 1+0.5. The adjustment cycle is 10 minutes, and the cycle is manually adjustable.

[0025] Preferably, in an implementation case, when △Djs > moisture content accuracy of 1 g / kg, and OUTjs = 0, and Tnp_bn < Tset_d - D, and OUTcomp < 95%, it indicates that the moisture load in the room is too large, resulting in the temperature after the inner disc reaching the control target, while the indoor humidity is higher than the set target value. Then, the control target value of the temperature after the inner machine evaporator is automatically corrected and reduced. Then, D = Dn - 1 + 0.5, and the adjustment period is 10 minutes, and the period can be adjusted manually.

[0026] Preferably, in an implementation case, when OUTjr > 20%, and OUTjs > 20%, and Tnp_bn < Tset_d - D, and OUTcomp > 30%, it indicates that the heat and moisture load in the room is too small. Controlling the temperature after the inner machine evaporator according to the set temperature and humidity in the room leads to excessive cooling and dehumidification, and the heating and humidification compensation is too large, resulting in excessive heat and cold cancellation, and dehumidification and humidification cancellation. Then, the control target value of the temperature after the inner machine evaporator is automatically corrected and increased. Then, D = Dn - 1 - 0.5, and the adjustment period is 10 minutes, and the period can be adjusted manually.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] It is reasonably designed, has clear logic, and is convenient to control, realizing the constant temperature and humidity control of variable dew point supply air temperature. If the heat and moisture load in the room is too large, resulting in the temperature after the inner disc reaching the control target, while the indoor temperature or humidity is higher than the set target value, then the control target value of the temperature after the inner machine evaporator is automatically corrected and reduced to meet the requirements of cooling and dehumidification, thereby achieving the control requirements of constant temperature and humidity; if the heat and moisture load in the room is too small, controlling the temperature after the inner machine evaporator according to the set temperature and humidity in the room leads to excessive cooling and dehumidification, and the heating and humidification compensation is too large, resulting in excessive heat and cold cancellation, and dehumidification and humidification cancellation. Then, the control target value of the temperature after the inner machine evaporator is automatically corrected and increased to reduce the output of the variable frequency compressor, heater, and humidifier, thereby reducing the degree of heat and cold cancellation, and dehumidification and humidification cancellation, making the unit operation more energy-efficient, covering all constant temperature and humidity air conditioning units, and having wide application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0030] Figure 1 It is a schematic diagram of the system module of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0032] Example: Figure 1 As shown, the present invention provides an improved constant temperature and humidity control method, comprising the following steps:

[0033] S1. Set the required constant temperature and humidity through the setting panel;

[0034] S2, the detection module detects the indoor temperature and humidity parameters, as well as the temperature parameters of the air outlet side of the indoor unit, and transmits the detection parameters to the controller;

[0035] S3. The controller calculates the change of the execution module according to the detected parameters and the design parameters, thereby controlling the operation of the air-conditioning components to adjust the temperature and humidity and realize constant temperature and humidity control.

[0036] Furthermore, the detection module includes an indoor temperature sensor, an indoor humidity sensor and an air outlet temperature sensor, which respectively detect the indoor temperature Tsn, the indoor humidity RHsn and the evaporator outlet temperature Tnp_b, and transmit the data to the controller.

[0037] Furthermore, the execution module includes a heater, a humidifier and a compressor. The heater and the humidifier are both installed in the indoor unit. The compressor is a built-in compressor of the air conditioner. The heater is one of electric heating, hot water or steam heating coils. The humidifier is one of electrode or electric heating, dry steam isenthalpic humidifiers. The compressor is a variable frequency compressor.

[0038] Furthermore, the heater is controlled by the controller and outputs OUTjr according to the pid algorithm. The humidifier is controlled by the controller and outputs OUTjs according to the pid algorithm. The compressor is controlled by the controller and outputs OUTcomp. The setting panel sets the control target values ​​of the indoor temperature Tset and relative humidity RHset. The controller calculates the set moisture content Dset and the set dew point temperature Tset_d according to the set temperature and relative humidity, and calculates the actual indoor moisture content Dsn according to the actual indoor temperature and relative humidity, so as to control the execution module.

[0039] The specific control process is as follows:

[0040] S1, the unit starts running;

[0041] S2. The controller detects the indoor set temperature Tset and relative humidity RHset, and calculates the theoretical value according to the air state, and calculates the moisture content Dset corresponding to the indoor set temperature and humidity.

[0042] S3. The controller detects the indoor actual temperature Tsn and relative humidity RHsn, and calculates the theoretical value according to the air state, and calculates the moisture content Dsn corresponding to the indoor actual temperature and humidity.

[0043] S4. The controller calculates the output change of the heater according to the following pid algorithm formula:

[0044] ΔOUTjr = Kjr p *(ΔTjr n - ΔTjr n-1 ) + Kjr i *ΔTjr n + Kjr d (ΔTjr n - 2*ΔTjr n-1 + ΔTjr n-2 ),

[0045] Where, Kjr p , Kjr i , Kjr d are the pid adjustment coefficients respectively, △Tjr n = Tsn n - Tset, △Tjr n-1 = Tsn n-1 - Tset, △Tjr n-2 = Tsn n-2 - Tset, the subscript n represents the current value, n - 1 represents the value one adjustment cycle before, and n - 2 represents the value two adjustment cycles before;

[0046] S5. When the controller calculates the heater output and controls the heater to work, the heater output calculation formula is OUTjr = OUTjr n-1 + △OUTjr, the subscript n - 1 represents the value one adjustment cycle before, and the range of OUTjr is 0 - 100%;

[0047] S6. The controller calculates the output change of the humidifier according to the following pid algorithm formula:

[0048] ΔOUTjs = Kjs p *(ΔDjs n - ΔDjs n-1 ) + Kjs i *ΔDjs n + Kjs d (ΔDjs n - 2*ΔDjsn-1 +ΔDjs n-2 ),

[0049] Among them, Kjs p 、Kjs i 、Kjs d are respectively the pid adjustment coefficients, △Djs n =Dsn n -Dset, △Djs n-1 =Dsn n-1 -Dset, △Djs n-2 =Dsn n-2 -Dset, the subscript n represents the current value, n - 1 represents the value one adjustment cycle ago, and n - 2 represents the value two adjustment cycles ago;

[0050] S7. When the controller calculates the output of the humidifier and controls the operation of the humidifier, the formula for the output of the humidifier is OUTjs = OUTjs n-1 +△OUTjs, the subscript n - 1 represents the value one adjustment cycle ago, and the range of OUTjs is 0 - 100%;

[0051] S8. The controller calculates the output change of the variable - frequency compressor according to the following pid algorithm formula:

[0052] ΔOUTcomp=Kcomp p *(ΔTcomp n -ΔTcomp n-1 )+Kcomp i *ΔTcomp n +Kcomp d (ΔTcomp n -2*ΔTcomp n-1 +ΔTcomp n-2 ),

[0053] Among them, Kcomp p 、Kcomp i 、Kcomp d are respectively the pid adjustment coefficients, △Tcomp n =Tnp_b n -Tset_d+D, △Tcomp n-1 =Tnp_b n-1 -Tset_d+D, △Tcomp n-2 =Tnp_b n-2 -Tset_d+D, the subscript n represents the current value, n - 1 represents the value one adjustment cycle ago, n - 2 represents the value two adjustment cycles ago, and D is the variable dew - point temperature adjustment parameter with an initial value of 1K;

[0054] S9. The controller calculates the output of the variable-frequency compressor and controls the operation of the compressor. The output calculation formula of the compressor is OUTcomp = OUTcomp n-1 + △OUTcomp. The subscript n - 1 represents the value in the previous adjustment cycle. The range of OUTcomp is 0 - 100%;

[0055] S10. When △Tjr > temperature control accuracy 1K, and OUTjr = 0, and Tnp_bn < Tset_d - D, and OUTcomp < 95%, it indicates that the heat load of the room is too large, resulting in the temperature after the inner disk reaching the control target, while the indoor temperature is higher than the set target value. Then, the control target value of the temperature after the evaporator of the indoor unit is automatically corrected and reduced, so D = Dn - 1+0.5. The adjustment cycle is 10 minutes, and the cycle is manually adjustable;

[0056] S11. When △Djs > moisture content accuracy 1g / kg, and OUTjs = 0, and Tnp_bn < Tset_d - D, and OUTcomp < 95%, it indicates that the moisture load of the room is too large, resulting in the temperature after the inner disk reaching the control target, while the indoor humidity is higher than the set target value. Then, the control target value of the temperature after the evaporator of the indoor unit is automatically corrected and reduced, so D = Dn - 1+0.5. The adjustment cycle is 10 minutes, and the cycle is manually adjustable;

[0057] S12. When OUTjr > 20%, and OUTjs > 20%, and Tnp_bn < Tset_d - D, and OUTcomp > 30%, it indicates that the heat and moisture load of the room is too small. Controlling the temperature after the evaporator of the indoor unit according to the set temperature and humidity of the room leads to excessive cooling and dehumidification, and the heating and humidification compensation is too large, resulting in excessive heat and cold cancellation, and dehumidification and humidification cancellation. Then, the control target value of the temperature after the evaporator of the indoor unit is automatically corrected and increased, so D = Dn - 1 - 0.5. The adjustment cycle is 10 minutes, and the cycle is manually adjustable;

[0058] S13. Return to step S2.

[0059] In summary, when the heat and moisture load of the room is too large, resulting in the temperature after the inner disk reaching the control target, while the indoor temperature or humidity is higher than the set target value, the control target value of the temperature after the evaporator of the indoor unit is automatically corrected and reduced to meet the needs of cooling and dehumidification, so as to achieve the control requirements of constant temperature and humidity; if the heat and moisture load of the room is too small, controlling the temperature after the evaporator of the indoor unit according to the set temperature and humidity of the room leads to excessive cooling and dehumidification, and the heating and humidification compensation is too large, resulting in excessive heat and cold cancellation, and dehumidification and humidification cancellation. Then, the control target value of the temperature after the evaporator of the indoor unit is automatically corrected and increased to reduce the output of the variable-frequency compressor, heater, and humidifier, so as to reduce the degree of heat and cold cancellation, and dehumidification and humidification cancellation, making the unit operation more energy-efficient.

[0060] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. An improved constant temperature and humidity control method, characterized in that, The steps include: S1. Set the required constant temperature and humidity through the setting panel; S2, the detection module detects the indoor temperature and humidity parameters, as well as the temperature parameters of the air outlet side of the indoor unit, and transmits the detection parameters to the controller; S3, the controller calculates the change amount of the execution module according to the detected parameters and the design parameters, thereby controlling the operation of the air-conditioning components to adjust the temperature and humidity and realize constant temperature and humidity control; The execution module includes a heater, a humidifier and a compressor, wherein the heater and the humidifier are both installed in the indoor unit, the compressor is a built-in compressor of the air conditioner, the heater is one of electric heating, hot water or steam heating coil, the humidifier is one of electrode or electric heating, dry steam isenthalpic humidifier, and the compressor is a variable frequency compressor; The heater is controlled by the controller and outputs OUTjr according to the pid algorithm. The humidifier is controlled by the controller and outputs OUTjs according to the pid algorithm. The compressor is controlled by the controller and outputs OUTcomp. The setting panel sets the control target values ​​of the indoor temperature Tset and the relative humidity RHset. The controller calculates the set moisture content Dset and the set dew point temperature Tset_d according to the set temperature and relative humidity, and calculates the actual indoor moisture content Dsn according to the actual indoor temperature and relative humidity, so as to control the execution module. In step S3, the controller calculates the output change of the heater according to the following pid algorithm formula: ΔOUTjr = Kjr p *(ΔTjr n -ΔTjr n-1 ) + Kjr i *ΔTjr n + Kjr d (ΔTjr n - 2*ΔTjr n-1 + ΔTjr n-2 ), Among them, Kjr p 、Kjr i 、Kjr d are respectively the pid adjustment coefficients, △Tjr n = Tsn n - Tset, △Tjr n-1 = Tsn n-1 - Tset, △Tjr n-2 = Tsn n-2 - Tset, the subscript n represents the current value, n - 1 represents the value one adjustment cycle ago, n - 2 represents the value two adjustment cycles ago. When the controller calculates the heater output and controls the heater to work, the heater output calculation formula is OUTjr = OUTjr n-1 + △OUTjr, the subscript n - 1 represents the value one adjustment cycle ago, and the range of OUTjr is 0 - 100%; In step S3, the controller calculates the output change of the humidifier according to the following pid algorithm formula: ΔOUTjs = Kjs p *(ΔDjs n -ΔDjs n-1 ) + Kjs i *ΔDjs n + Kjs d (ΔDjs n -2*ΔDjs n-1 + ΔDjs n-2 ), Among them, Kjs p 、Kjs i 、Kjs d are respectively the pid adjustment coefficients, △Djs n = Dsn n - Dset, △Djs n-1 = Dsn n-1 - Dset, △Djs n-2 = Dsn n-2 - Dset, the subscript n represents the current value, n - 1 represents the value one adjustment cycle ago, n - 2 represents the value two adjustment cycles ago. When the controller calculates the output of the humidifier and controls the operation of the humidifier, the calculation formula for the output of the humidifier is, OUTjs = OUTjs n-1 + △OUTjs, the subscript n - 1 represents the value one adjustment cycle ago, and the range of OUTjs is 0 - 100%; In step S3, the controller calculates the output change of the variable frequency compressor according to the following pid algorithm formula: ΔOUTcomp = Kcomp p *(ΔTcomp n -ΔTcomp n-1 ) + Kcomp i *ΔTcomp n + Kcomp d (ΔTcomp n -2*ΔTcomp n-1 + ΔTcomp n-2 ), Among them, Kcomp p 、Kcomp i 、Kcomp d are respectively the pid adjustment coefficients, and △Tcomp n = Tnp_b n - Tset_d + D, △Tcomp n-1 = Tnp_b n-1 - Tset_d + D, △Tcomp n-2 = Tnp_b n-2 - Tset_d + D, where the subscript n represents the current value, n - 1 represents the value one adjustment cycle ago, n - 2 represents the value two adjustment cycles ago, D is the variable dew point temperature adjustment parameter with an initial value of 1K, the controller calculates the output of the variable frequency compressor to control the operation of the compressor, and the compressor output calculation formula is, OUTcomp = OUTcomp n-1 + △OUTcomp, where the subscript n - 1 represents the value one adjustment cycle ago, and the range of OUTcomp is 0 - 100%; When △Tjr>temperature control accuracy 1K, and OUTjr=0, and Tnp_bn<Tset_d-D, and OUTcomp<95%, it means that the heat load of the room is too large, causing the temperature behind the inner disk to reach the control target, while the indoor temperature is higher than the set target value, then the control target value of the temperature behind the evaporator of the indoor unit is automatically corrected to reduce, then D=Dn-1+0.5, the adjustment cycle is 10 minutes, and the cycle can be adjusted manually; When △Djs>humidity accuracy 1g / kg, and OUTjs=0, and Tnp_bn<Tset_d-D, and OUTcomp<95%, it means that the wet load of the room is too large, causing the temperature behind the inner plate to reach the control target, and the indoor humidity is higher than the set target value, then the control target value of the temperature behind the evaporator of the indoor unit is automatically corrected to reduce, then D=Dn-1+0.5, the adjustment cycle is 10 minutes, and the cycle can be adjusted manually; When OUTjr > 20%, and OUTjs > 20%, and Tnp_bn < Tset_d - D, and OUTcomp > 30%, it indicates that the heat and moisture load of the room is small. Controlling the temperature after the evaporator of the indoor unit according to the set temperature and humidity of the room leads to excessive cooling and dehumidification, and the heating and humidification compensation is too large, resulting in excessive heat and cold cancellation, and dehumidification and humidification cancellation. Then, the control target value of the temperature after the evaporator of the indoor unit is automatically corrected and increased. Then, D = Dn - 1 - 0.5, and the adjustment period is 10 minutes, which can be manually adjusted periodically.

2. An improved constant temperature and humidity control method according to claim 1, characterized in that, The detection module includes an indoor temperature sensor, an indoor humidity sensor, and an air outlet side temperature sensor, which respectively detect the indoor temperature Tsn, the indoor humidity RHsn, and the evaporator outlet temperature Tnp_b, and transmit the data to the controller.

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