CN112833579B - Multi-mode heat pump tobacco curing system and control method thereof - Google Patents

Multi-mode heat pump tobacco curing system and control method thereof Download PDF

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CN112833579B
CN112833579B CN202110093388.4A CN202110093388A CN112833579B CN 112833579 B CN112833579 B CN 112833579B CN 202110093388 A CN202110093388 A CN 202110093388A CN 112833579 B CN112833579 B CN 112833579B
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variable frequency
heat exchanger
fan
rotating speed
temperature
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CN112833579A (en
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陈佳恒
苏帆
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Zhengzhou University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
    • A24B3/00—Preparing tobacco in the factory
    • A24B3/10—Roasting or cooling tobacco
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B30/00—Heat pumps
    • F25B30/02—Heat pumps of the compression type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
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Abstract

The invention discloses a multi-mode heat pump tobacco curing system and a control method thereof, wherein the multi-mode heat pump tobacco curing system comprises a controller, and a variable frequency compressor, a four-way reversing valve, an outdoor heat exchanger and a heat exchange air box which are connected with the controller; an adjustable air door is arranged at the inlet of the heat exchange air box, and a variable frequency fan is arranged at the outlet of the heat exchange air box; the variable frequency compressor is connected with a four-way reversing valve, and the four-way reversing valve is connected with the outdoor heat exchanger and the second indoor heat exchanger; the outdoor heat exchanger, the first indoor heat exchanger and the second indoor heat exchanger are connected together through the one-way valve and the electronic expansion valve. The heat pump controls the distribution of the air volume through the opening of the air adjusting door by adjusting the rotating speed of the compressor, the direction of the four-way reversing valve and the opening of the electronic expansion valve, so that the switching of multiple working modes of the system is realized, the aim of accurately controlling the temperature and humidity in the flue-cured barn is fulfilled, the heat of return air can be effectively recovered, the energy consumption of flue-cured tobaccos is reduced, the technological requirement of flue-cured tobaccos can be met, the aims of efficiently dehumidifying and accurately controlling the temperature and humidity of the flue-cured barn are fulfilled.

Description

Multi-mode heat pump tobacco curing system and control method thereof
Technical Field
The invention belongs to the technical field of heat pump flue-cured tobacco, and particularly relates to a multi-mode heat pump flue-cured tobacco system and a control method thereof.
Background
The heat pump drying system has the advantages of high dehumidification speed, high efficiency and low energy consumption, can greatly reduce drying energy consumption, reduce pollutant and greenhouse gas emission, can improve the baking quality of products, is widely applied to the field of tobacco drying, and obtains good social and economic benefits. The heat pump flue-cured tobacco system can be divided into an open system, a closed system and a semi-open system according to the air circulation form.
The open system can only utilize the air once, the fresh air sucked from the environment is directly sent into the tobacco flue-curing house after being heated by the condenser, and is directly discharged into the environment after being subjected to heat exchange and humidity exchange operation with the tobacco leaves. The air that the closed system then planted the baking house is cyclic utilization in totally enclosed circulating channel, exhaust high temperature and high humidity air is after by evaporimeter dehumidification processing in the baking tobacco house, send back again in the baking tobacco house with the tobacco leaf heat transfer moisture transfer operation after heating by the condenser again, the new trend is not introduced from external environment to the closed system, also to emission waste gas in the external environment, there is not new trend heat load, so the energy consumption is minimum, but this system is because the continuous input of compressor power, the baking house temperature can constantly rise, be unfavorable for the accurate control of baking house internal temperature. The half-open system mixes the exhaust return air in the partial tobacco flue-curing house with the new trend of introducing from the external world, sends into indoorly after the condenser heating again, and the partial heat in the recoverable return air of half-open system is more energy-conserving in open system relatively, can effectively realize the temperature control in the baking house in comparison with closed system, but moisture content in the return air is great, has increased the moisture content in the air mixture, can reduce the dehumidification efficiency in the system.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide a heat pump tobacco curing system with multiple working modes and a control method thereof, the flow direction and the flow of a refrigerant are effectively controlled by controlling the rotating speed of a compressor, the direction of a four-way reversing valve and the opening degree of an electronic expansion valve, the switching of the multiple working modes is realized, the aim of accurately controlling the temperature and the humidity in a curing barn is fulfilled, the return air heat is more effectively recovered, the energy consumption of cured tobacco is reduced, and the technological requirements of cured tobacco are met.
In order to achieve the purpose, the invention adopts the technical scheme that:
a multi-mode heat pump tobacco curing system comprises a controller, a variable frequency compressor, a four-way reversing valve, an outdoor heat exchanger, an indoor heat exchanger and a sensor group, wherein the variable frequency compressor, the four-way reversing valve and the outdoor heat exchanger are connected with the controller; an adjustable air door is arranged at the inlet of the heat exchange air box, and a variable frequency fan is arranged at the outlet of the heat exchange air box.
A first air cavity and a second air cavity are independently arranged in the heat exchange air box in a split mode, and inlets and outlets of the first air cavity and the second air cavity are communicated together; the indoor heat exchanger comprises a first indoor heat exchanger and a second indoor heat exchanger which are respectively and correspondingly arranged in the first air cavity and the second air cavity.
Furthermore, the outlet of the variable frequency compressor is connected with the first connecting port of the four-way reversing valve, the second connecting port of the four-way reversing valve is connected with one end of the outdoor heat exchanger, the third connecting port is communicated with the inlet of the variable frequency compressor, and the fourth connecting port is connected with one end of the second indoor heat exchanger; the other end of the outdoor heat exchanger is respectively connected with one end of the first indoor heat exchanger and the inlet of the first one-way valve, the outlet of the first one-way valve is respectively connected with one end of the electronic expansion valve and the inlet of the second one-way valve, the outlet of the second one-way valve is connected with the other end of the first indoor heat exchanger, and the other end of the electronic expansion valve is connected with the other end of the second indoor heat exchanger; the sensor group comprises a first temperature and humidity sensor arranged at the outlet of the heat exchange air box, a second temperature and humidity sensor arranged at the inlet of the heat exchange air box, a third temperature and humidity sensor in the environment of the curing barn and a temperature and pressure sensor arranged on a pipeline connected with the air inlet of the variable frequency compressor, and data signals collected by the sensor group are transmitted to the controller; and the controller controls the variable-frequency compressor, the variable-frequency fan, the electronic expansion valve and the adjustable air door according to the actual working condition.
Based on the multi-mode heat pump tobacco curing system, the invention also provides a control method of the system, which comprises the following concrete implementation steps:
1) according to different process requirements of flue-cured tobacco, after the multi-mode heat pump flue-cured tobacco system is started, the target temperature t of indoor air of the flue-cured tobacco is set through the controller0And target relative humidity
Figure BDA0002911876540000031
Setting the maximum upward deviation value delta t of the target temperatureuAnd maximum downward deviation value of Δ td，ΔtuAnd Δ tdIn the range of 1-10 ℃; the maximum upward deviation value of the target relative humidity is
Figure BDA0002911876540000032
In the range of 0-20%;
2) the controller is used for setting the upper limit value dt of indoor temperature rise or temperature drop rate of the flue-cured tobacco under different working modesuAnd a lower limit value dtd，dtuAnd dtdIn the range of 0.1-5 ℃ per minute, and an upper limit value of the dehumidification rate
Figure BDA0002911876540000033
And lower limit value
Figure BDA0002911876540000034
And
Figure BDA0002911876540000035
in the range of 0.1% -5% per minute; meanwhile, timing the starting time of the system, wherein the accumulated working time is tau;
3) third sensor detects current air temperature t in flue-cured tobacco room in real time in unit working process1And relative humidity
Figure BDA0002911876540000036
And the difference between the current air temperature and the target temperature in the flue-cured tobacco room and the difference between the current air humidity and the target humidity are judged by the controller, and the flow direction of the refrigerant are controlled by the controller by adjusting the rotating speed of the compressor, the direction of the four-way reversing valve and the opening of the electronic expansion valveThe flow controls the distribution of the amount of wind through the aperture of the air damper, so that the switching of multiple working modes of the system is realized, the aim of accurately controlling the temperature and the humidity in the baking room is fulfilled, the reasonable distribution of energy is realized due to the temperature and the heat requirement of the matched materials in different drying stages, and the waste is avoided.
4) During the operation period of the heat pump tobacco curing system, comparing the accumulated working time tau with the preset detection time interval tau of the systemsSize, τsThe range is 1-10 min; if tausIf the value is more than tau, the system keeps the current working mode unchanged; if tausAnd (4) zero clearing is carried out on tau if tau is less than or equal to tau, and the system returns to the step 3) to continuously judge and adjust the working state.
In step 3), according to the judgment result of the controller, the system selects and executes a corresponding heating mode, a heating dehumidification mode, a dehumidification mode or a temperature regulation dehumidification mode, specifically:
31) if t1-t0＜-ΔtdAnd is
Figure BDA0002911876540000041
The system executes a heating mode, the controller calculates the actual temperature rise rate dt in the flue-cured tobacco chamber, and the actual temperature rise rate dt and the target temperature rise rate upper limit value dtuLower limit value dtdComparing, and performing system regulation and control according to a comparison result;
32) if t1-t0＜-ΔtdAnd is
Figure BDA0002911876540000042
The system executes a heating and dehumidifying mode, and the controller calculates the actual dehumidifying rate in the flue-cured tobacco chamber
Figure BDA0002911876540000043
And comparing the actual dehumidification rates
Figure BDA0002911876540000044
And the target upper limit value of dehumidification rate
Figure BDA0002911876540000045
Lower limit value
Figure BDA0002911876540000046
Calculating the actual temperature rise rate dt in the tobacco curing chamber, and comparing the actual temperature rise rate dt with the target temperature rise rate upper limit value dtuLower limit value dtdPerforming system regulation and control according to the comparison result;
33) if- Δ td≤t1-t0≤ΔtuAnd is
Figure BDA0002911876540000047
The system executes a dehumidification mode, and the controller calculates the evaporation temperature t according to the refrigerant pressure collected by the temperature and pressure sensoreComparison of the evaporating temperature teAnd a preset minimum evaporation temperature tsCalculating the actual dehumidification rate in the flue-cured tobacco chamber
Figure BDA0002911876540000048
And comparing the actual dehumidification rates
Figure BDA0002911876540000049
And the target upper limit value of dehumidification rate
Figure BDA00029118765400000410
Lower limit value
Figure BDA00029118765400000411
Performing system regulation and control according to the comparison result;
34) if t1-t0＞-ΔtdAnd is provided with
Figure BDA0002911876540000051
The controller controls the frequency conversion compressor to shut down and closes the outdoor heat exchanger fan, the electronic expansion valve and the frequency conversion fan;
35) if t1-t0＞ΔtuAnd is
Figure BDA0002911876540000052
The system executes a temperature-adjusting dehumidification mode, and the controller calculates the actual temperature in the tobacco-curing chamberRate of inter-dehumidification
Figure BDA0002911876540000053
And comparing the actual dehumidification rates
Figure BDA0002911876540000054
And the target upper limit value of dehumidification rate
Figure BDA0002911876540000055
Lower limit value
Figure BDA0002911876540000056
Calculating the actual temperature drop rate dt in the flue-cured tobacco chamber, and comparing the actual temperature drop rate dt with the target temperature drop rate upper limit value dtuLower limit value dtdAnd carrying out system regulation and control according to the comparison result.
Wherein the actual temperature rise or temperature drop rate dt is per regulation period tausThe average value of the internal temperature rise or the temperature drop rate is calculated according to the following formula:
Figure BDA0002911876540000057
wherein q is the mass flow of air flowing through the heat exchange air box and the unit is m3/s；tioThe temperature difference of the inlet and the outlet of the heat exchange air box is measured in units of temperature; vdryIs the air volume in the flue-cured tobacco chamber, and the unit is m3；
The actual dehumidification rate
Figure BDA00029118765400000510
For each regulation period tausThe average value of the inner dehumidification rate is calculated by the following formula:
Figure BDA0002911876540000058
wherein
Figure BDA0002911876540000059
The difference value of the relative moisture content of the inlet and the outlet of the heat exchange air box is obtained.
Wherein, in the step 31), the upper limit value dt of the target temperature rise rate is compared according to the actual temperature rise rate dtuLower limit value dtdAs a result, the controller specifically regulates the system as follows:
if dt > dtuReducing the rotating speed of the variable frequency compressor, and adjusting the rotating speed of the fan of the outdoor heat exchanger, the opening degree of the electronic expansion valve and the rotating speed of the variable frequency fan to adapt to the change of the rotating speed of the variable frequency compressor;
if dt < dtdIncreasing the rotating speed of the variable frequency compressor, and simultaneously adjusting the rotating speed of the fan of the outdoor heat exchanger, the opening degree of the electronic expansion valve and the rotating speed of the variable frequency fan to adapt to the change of the rotating speed of the variable frequency compressor;
if dtu≥dt≥dtdThe system operating parameters are not adjusted.
Wherein, the step 32) is based on the actual dehumidification rate
Figure BDA0002911876540000061
Comparing the target dehumidification rate upper limit value
Figure BDA0002911876540000062
Lower limit value
Figure BDA0002911876540000063
As a result, the controller specifically regulates the system as follows:
if it is
Figure BDA0002911876540000064
The opening degree of the adjustable air door is reduced; if it is
Figure BDA0002911876540000065
Increasing the opening degree of the adjustable air door;
if it is
Figure BDA0002911876540000066
The opening degree of the adjustable air door is not changed; the controller then compares the target temperature rise against the actual temperature rise rate dtUpper limit of rate dtuLower limit value dtdAs a result, the controller regulates and controls the system, specifically:
if dt > dtuReducing the rotating speed of the variable frequency compressor, and simultaneously adjusting the air speed of the outdoor heat exchanger fan, the opening of the electronic expansion valve and the air speed of the variable frequency fan to adapt to the change of the rotating speed of the compressor; if dt < dtdIncreasing the rotating speed of the variable frequency compressor, and simultaneously adjusting the air speed of the outdoor heat exchanger fan, the opening of the electronic expansion valve and the air speed of the variable frequency fan to adapt to the change of the rotating speed of the variable frequency compressor; if dt isu≥dt≥dtdThe system operating parameters are not adjusted.
Wherein, the evaporation temperature t is calculated according to the step 33)eAnd a preset minimum evaporation temperature tsThe controller specifically regulates and controls the system according to the comparison result of (1):
if t ise＜tsImmediately reducing the rotating speed of the variable frequency compressor, and simultaneously adjusting the fan speed of the outdoor heat exchanger, the opening of the electronic expansion valve and the fan speed to adapt to the change of the rotating speed of the compressor;
if te≥tsIf so, no adjustment is performed; the controller then bases the actual dehumidification rate
Figure BDA0002911876540000071
Comparing the upper limit of the target dehumidification rate
Figure BDA0002911876540000072
Lower limit value
Figure BDA0002911876540000073
As a result, the controller regulates and controls the system, specifically:
if it is
Figure BDA0002911876540000074
The opening of the adjustable air door and the rotating speed of the variable frequency compressor are reduced, and the wind speed of the outdoor heat exchanger fan, the opening of the electronic expansion valve and the wind speed of the variable frequency fan are adjusted to adapt to the change of the rotating speed of the variable frequency compressor; if it is
Figure BDA0002911876540000075
Increasing the opening of the adjustable air door and the rotating speed of the variable frequency compressor, and simultaneously adjusting the wind speed of the outdoor heat exchanger fan, the opening of the electronic expansion valve and the wind speed of the variable frequency fan to adapt to the change of the rotating speed of the variable frequency compressor; if it is
Figure BDA0002911876540000076
The opening degree of the adjustable air door and the rotating speed of the variable-frequency compressor are not changed.
Wherein, the step 35) is based on the actual dehumidification rate
Figure BDA0002911876540000077
Comparing the upper limit of the target dehumidification rate
Figure BDA0002911876540000078
Lower limit value
Figure BDA0002911876540000079
As a result, the controller specifically regulates the system as follows:
if it is
Figure BDA00029118765400000710
Reducing the rotating speed of the variable frequency fan; if it is
Figure BDA00029118765400000711
Increasing the rotating speed of the variable frequency fan;
if it is
Figure BDA00029118765400000712
Then not adjusting; then, the controller compares the upper limit value dt of the target temperature rise rate according to the actual temperature rise rate dtuLower limit value dtdAs a result, the controller regulates and controls the system, specifically:
if dt > dtuReducing the rotating speed of the variable frequency compressor, and simultaneously adjusting the wind speed of the outdoor heat exchanger fan, the opening of the electronic expansion valve and the wind speed of the variable frequency fan to adapt to the change of the rotating speed of the variable frequency compressor; if dt < dtdIncreasing the rotation speed of the frequency conversion compressor, and simultaneously adjusting the wind speed and the electronic expansion of the fan of the outdoor heat exchangerThe opening degree of an expansion valve and the wind speed of a variable frequency fan are adapted to the change of the rotating speed of the variable frequency compressor; if dtu≥dt≥dtdThe system operating parameters are not adjusted.
The invention has the following beneficial effects:
aiming at the defects that an open system is low in energy utilization rate and high in energy consumption, a closed system cannot effectively control the temperature of a curing barn and a semi-open system is low in dehumidification efficiency in the conventional heat pump tobacco curing system, the multi-mode heat pump tobacco curing system provided by the invention absorbs the advantages of the three systems, discards the defects of the three systems, has multiple working modes, can effectively recover return air heat, reduces the energy consumption of tobacco curing, can meet the technological requirements of tobacco curing, can realize efficient dehumidification and can accurately control the temperature of the curing barn.
Drawings
FIG. 1 is a schematic structural diagram of a multi-mode heat pump tobacco curing system according to the present invention;
FIG. 2 is a logic diagram of the control method of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
As shown in figure 1, the tobacco curing system with the multi-mode heat pump comprises a controller 305, a variable frequency compressor 101 connected with the controller 305, a four-way reversing valve 102, an outdoor heat exchanger 103, an indoor heat exchanger arranged inside a heat exchange air box 201, a sensor group and the like.
The heat exchange air box 201 comprises two independent air cavities, the middle of the air cavity is completely separated, the inside of the air cavity is independently divided into a first air cavity 204 and a second air cavity 205, and inlets and outlets of the two air cavities are communicated together. An adjustable air door 202 is arranged at the inlet of the heat exchange air box, and a variable frequency fan 203 is arranged at the outlet of the heat exchange air box; the indoor heat exchanger comprises a first indoor heat exchanger 106 and a second indoor heat exchanger 107 which are respectively and correspondingly arranged in a first air cavity 204 and a second air cavity 205; the outlet of the variable frequency compressor 101 is connected with a first connecting port 102-1 of a four-way reversing valve 102, a second connecting port 102-2 of the four-way reversing valve 102 is connected with one end of an outdoor heat exchanger 103, a third connecting port 102-3 is communicated with the inlet of the variable frequency compressor 101, and a fourth connecting port 102-4 is connected with one end of a second indoor heat exchanger 107; the other end of the outdoor heat exchanger 103 is respectively connected with one end of a first indoor heat exchanger 106 and an inlet of a first check valve 104, an outlet of the first check valve 104 is respectively connected with one end of an electronic expansion valve 108 and an inlet of a second check valve 105, an outlet of the second check valve 105 is connected with the other end of the first indoor heat exchanger 106, and the other end of the electronic expansion valve 108 is connected with the other end of a second indoor heat exchanger 107;
the sensor group comprises a first temperature and humidity sensor 301, a second temperature and humidity sensor 302, a third temperature and humidity sensor 303 and a temperature and pressure sensor 304. Wherein, the first temperature and humidity sensor 301 is arranged at the outlet of the heat exchange air box, the second temperature and humidity sensor 302 is arranged at the inlet of the heat exchange air box, the third temperature and humidity sensor 303 is arranged outside the heat exchange air box 201 and in the indoor environment of the baking room, and the temperature and pressure sensor 304 is arranged on a pipeline connected with the air inlet of the variable frequency compressor 101;
in order to achieve the effect of multi-mode constant-temperature dehumidification of flue-cured tobacco, the multi-mode heat pump flue-cured tobacco system of the embodiment can realize the switching of the working modes by the different conduction modes inside the four connectors of the four-way reversing valve 102 driven by the input signal of the controller 305, that is, the switching of the first working state and the second working state is realized.
The first working state: the first connection port 102-1 of the four-way reversing valve 102 is communicated with the inside of the second connection port 102-2, and the third connection port 102-3 is communicated with the inside of the fourth connection port 102-4;
the second working state: the first connection port 102-1 of the four-way selector valve 102 is connected to the fourth connection port 102-4, and the second connection port 102-2 is connected to the third connection port 102-3.
Correspondingly, the embodiment also provides a control method of the multi-mode heat pump tobacco curing system, according to the tobacco curing process requirement, the tobacco curing heat pump system has four working modes of a heating mode, a heating dehumidification mode, a temperature adjustment dehumidification mode and a dehumidification mode, the multi-mode heat pump tobacco curing system can effectively control the flow direction and the flow rate of a refrigerant by adjusting the rotating speed of the compressor 101, switching the working state of the four-way reversing valve 102 and adjusting the opening degree of the electronic expansion valve 108, and effectively control the distribution of air volume by controlling the opening degree of the adjustable air door 202, so that the switching of multiple working modes of the system is realized.
Wherein the heating mode is as follows: the variable frequency compressor 101 is started, the four-way reversing valve 102 is switched to a second working state, the electronic expansion valve 108 is started, the fan of the outdoor heat exchanger 103 is started, the adjustable air door 202 closes the inlet of the first air cavity 204, the inlet of the second air cavity 205 is completely opened, and the variable frequency fan 203 is started;
a heating and dehumidifying mode: the variable frequency compressor 101 is started, the four-way reversing valve 102 is switched to a second working state, the electronic expansion valve 108 is started, the fan of the outdoor heat exchanger 103 is started, the adjustable air door 202 simultaneously opens the inlet of the first air cavity 204 and the inlet of the second air cavity 205, and the variable frequency fan 203 is started;
temperature adjustment and dehumidification mode: the variable frequency compressor 101 is started, the four-way reversing valve 102 is switched to a first working state, the electronic expansion valve 108 is started, the fan of the outdoor heat exchanger 103 is started, the adjustable air door 202 closes the inlet of the first air cavity 204, and the variable frequency fan 203 is started;
a dehumidification mode: the variable frequency compressor 101 is started, the four-way reversing valve 102 is switched to the second working state, the electronic expansion valve 108 is started, the fan of the outdoor heat exchanger 103 is closed, the adjustable air door 202 closes the inlet of the first air cavity 204, the inlet of the second air cavity 205 is completely opened, and the variable frequency fan 203 is started.
Correspondingly, based on the multi-mode heat pump tobacco curing system, the invention also provides a control method of the tobacco curing system; as shown in fig. 2, the specific steps are as follows:
1) according to different process requirements of flue-cured tobacco, after the multi-mode heat pump flue-cured tobacco system is started, the indoor air target temperature t of the flue-cured tobacco is set through the controller 3050And target relative humidity
Figure BDA0002911876540000117
Setting the maximum upward deviation value delta t of the target temperatureuAnd a maximum downward deviation value Δ td，ΔtuAnd Δ tdIn the range of 1-10 deg.C, the maximum upward deviation value of the target relative humidity
Figure BDA0002911876540000111
Range of (1)0 to 20 percent;
2) according to different process requirements of the flue-cured tobacco, the controller 305 sets the upper limit value dt of the indoor temperature rise/temperature drop rate of the flue-cured tobacco in different working modesuAnd a lower limit value dtd，dtuAnd dtdIn the range of 0.1-5 ℃ per minute, the upper limit of the dehumidification rate
Figure BDA0002911876540000112
And lower limit value
Figure BDA0002911876540000113
And
Figure BDA0002911876540000114
the range of (1) is 0.1-5% per minute, and the system starting time is timed, and the accumulated working time is tau;
3) detecting the current air temperature t of the tobacco curing chamber according to the third sensor 303 in the tobacco curing process1And relative humidity
Figure BDA0002911876540000115
And transmits to the controller 305, the controller 305 compares the related data, and the system can select to execute a heating mode, a heating dehumidification mode, a dehumidification mode, and a temperature adjustment dehumidification mode, specifically:
31) if t1-t0＜-ΔtdAnd is
Figure BDA0002911876540000116
The system executes a heating mode, the controller 305 calculates an actual temperature rise rate dt in the flue-cured tobacco chamber, and compares the actual temperature rise rate dt with a target temperature rise rate upper limit value dtuLower limit value dtdComparing, and adjusting the working states of the outdoor heat exchanger 103, the electronic expansion valve 108, the variable frequency fan 203 and the variable frequency compressor 101 according to the comparison result to realize system heating and temperature rise; the method specifically comprises the following steps:
31-1) if dt > dtuThen, the rotation speed of the inverter compressor 101 is reduced, and at the same time, the fan rotation speed of the outdoor heat exchanger 103, the opening degree of the electronic expansion valve 108 and the rotation speed of the inverter fan 203 are adjusted to adapt toThe rotating speed of the variable frequency compressor 101 changes;
31-2) if dt < dtdIncreasing the rotating speed of the variable frequency compressor 101, and adjusting the rotating speed of the fan of the outdoor heat exchanger 103, the opening degree of the electronic expansion valve 108 and the rotating speed of the variable frequency fan 203 to adapt to the change of the rotating speed of the variable frequency compressor 101;
31-3) if dtu≥dt≥dtdThe system operating parameters are not adjusted.
32) If t1-t0＜-ΔtdAnd is
Figure BDA0002911876540000121
The system executes a warm-up dehumidification mode and the controller 305 calculates the actual dehumidification rate in the flue-cured tobacco chamber
Figure BDA0002911876540000122
And comparing the actual dehumidification rates
Figure BDA0002911876540000123
And the target upper limit value of dehumidification rate
Figure BDA0002911876540000124
Lower limit value
Figure BDA0002911876540000125
Adjusting the working states of the outdoor heat exchanger 103, the electronic expansion valve 108, the variable frequency fan 203 and the variable frequency compressor 101 according to the comparison result to realize system heating and temperature rise and return air dehumidification; the method specifically comprises the following steps:
32-1) if
Figure BDA0002911876540000126
The opening of the adjustable damper 202 is decreased;
32-2) if
Figure BDA0002911876540000127
The opening degree of the adjustable air door 202 is increased;
32-3) if
Figure BDA0002911876540000128
The opening degree of the adjustable air door 202 is not changed;
then, the controller 305 compares the actual temperature rise rate dt in the flue-cured tobacco chamber with the upper limit value dt of the target temperature rise rate according to the calculationuLower limit value dtdThe result of (2) regulating and controlling the system specifically comprises the following steps:
if dt > dtuIf so, reducing the rotating speed of the variable frequency compressor 101, and simultaneously adjusting the wind speed of the fan of the outdoor heat exchanger 103, the opening degree of the electronic expansion valve 108 and the wind speed of the variable frequency fan 203 to adapt to the change of the rotating speed of the compressor 101; if dt < dtdIf so, increasing the rotating speed of the variable frequency compressor 101, and simultaneously adjusting the wind speed of the fan of the outdoor heat exchanger 103, the opening degree of the electronic expansion valve 108 and the wind speed of the variable frequency fan 203 to adapt to the change of the rotating speed of the variable frequency compressor 101; if dtu≥dt≥dtdThe system operating parameters are not adjusted.
33) If- Δ td≤t1-t0≤ΔtuAnd is
Figure BDA0002911876540000129
The system performs a dehumidification mode, and the controller 305 calculates an evaporation temperature t according to the refrigerant pressure collected by the temperature and pressure sensor 304eAnd with a predetermined minimum evaporation temperature tsComparing, and adjusting the working states of the adjustable air door 202, the variable frequency compressor 101, the outdoor heat exchanger 103, the electronic expansion valve 108 and the variable frequency fan 203 according to the result to realize return air dehumidification; the method specifically comprises the following steps:
33-1) if te＜tsIf so, immediately reducing the rotating speed of the variable frequency compressor 101, and simultaneously adjusting the fan speed of the outdoor heat exchanger 103, the opening degree of the electronic expansion valve 108 and the wind speed of the variable frequency fan 203 to adapt to the change of the rotating speed of the compressor 101;
33-2) if te≥tsCalculating the actual dehumidification rate in the flue-cured tobacco chamber
Figure BDA0002911876540000131
Comparison of actual dehumidification rates
Figure BDA0002911876540000132
With the object to remove moistureUpper limit of rate
Figure BDA0002911876540000133
And lower limit value
Figure BDA0002911876540000134
The method specifically comprises the following steps:
if it is
Figure BDA0002911876540000135
The opening degree of the adjustable air door 202 and the rotating speed of the variable-frequency compressor 101 are reduced, and the fan speed of the outdoor heat exchanger 103, the opening degree of the electronic expansion valve 108 and the wind speed of the variable-frequency fan 203 are adjusted to adapt to the change of the rotating speed of the variable-frequency compressor 101; if it is
Figure BDA0002911876540000136
The opening degree of the adjustable air door 202 and the rotating speed of the variable-frequency compressor 101 are increased, and the fan speed of the outdoor heat exchanger 103, the opening degree of the electronic expansion valve 108 and the wind speed of the variable-frequency fan 203 are adjusted to adapt to the change of the rotating speed of the variable-frequency compressor 101; if it is
Figure BDA0002911876540000137
The opening degree of the adjustable damper 202 and the rotating speed of the inverter compressor 101 are not changed.
34) If t1-t0＞-ΔtdAnd is
Figure BDA0002911876540000138
The controller 305 controls the inverter compressor 101 to shut down and closes the outdoor heat exchanger 103 fan, the electronic expansion valve 108 and the inverter fan 203;
35) if t1-t0＞ΔtuAnd is
Figure BDA0002911876540000139
The system executes a temperature-adjusting dehumidification mode, and the controller 305 calculates the actual dehumidification rate in the flue-cured tobacco chamber
Figure BDA00029118765400001310
And comparing the actual dehumidification rates
Figure BDA00029118765400001311
And the target upper limit value of dehumidification rate
Figure BDA00029118765400001312
Lower limit value
Figure BDA00029118765400001313
Adjusting the working states of the outdoor heat exchanger 103, the electronic expansion valve 108, the variable frequency fan 203 and the variable frequency compressor 101 according to the comparison result; the method specifically comprises the following steps:
35-1) if
Figure BDA00029118765400001314
Reducing the rotating speed of the variable frequency fan 203;
35-2) if
Figure BDA0002911876540000141
Increasing the rotating speed of the variable frequency fan 203;
35-3) if
Figure BDA0002911876540000142
Then not adjusting; the controller 305 calculates the actual temperature rise rate dt in the flue-cured tobacco chamber, and compares the actual temperature rise rate dt with the upper limit value dt of the target temperature rise rateuAnd a lower limit value dtdThe method specifically comprises the following steps:
if dt > dtuIf so, reducing the rotating speed of the variable frequency compressor 101, and simultaneously adjusting the fan speed of the outdoor heat exchanger 103, the opening degree of the electronic expansion valve 108 and the wind speed of the variable frequency fan 203 to adapt to the change of the rotating speed of the variable frequency compressor 101; if dt < dtdIncreasing the rotating speed of the variable frequency compressor 101, and simultaneously adjusting the fan speed of the outdoor heat exchanger 103, the opening degree of the electronic expansion valve 108 and the wind speed of the variable frequency fan 203 to adapt to the change of the rotating speed of the variable frequency compressor 101; if dtu≥dt≥dtdThe system operating parameters are not adjusted.
4) During the operation of the heat pump tobacco curing system, the controller 305 detects the time interval τ according to the actual accumulated working time τ and the preset system detection time interval τsComparison of the sizes, τsThe range is 1-10 min; if tausIf the value is more than tau, the system keeps the current working mode unchanged; if tausAnd (4) zero clearing is carried out on tau if tau is less than or equal to tau, and the system returns to the last state to continuously judge and adjust the working state.
Wherein the actual rate of temperature rise dt is per regulation period tausThe average value of the internal temperature rise rate is calculated according to the following formula:
Figure BDA0002911876540000143
in the formula, q is the mass flow of air flowing through the heat exchange bellows 201 and is expressed in m3/s；tioThe temperature difference between the inlet and the outlet of the heat exchange air box 201 is measured in units of ℃; vdryIs the air volume in the flue-cured tobacco chamber, and the unit is m3；
Actual rate of dehumidification
Figure BDA0002911876540000144
For each regulation period tausThe average value of the inner dehumidification rate is calculated by the following formula:
Figure BDA0002911876540000151
in the formula
Figure BDA0002911876540000152
Is the difference value of the relative moisture content of the inlet and the outlet of the heat exchange wind box 201.
The opening of the adjustable air door at the inlet of the heat exchange air box is adjusted to be larger, so that the inlet of the first air cavity is enlarged, and the inlet of the second air cavity is reduced; the opening degree of the adjustable air door is reduced, so that the inlet of the second air cavity is enlarged, and the inlet of the first air cavity is reduced.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (8)

1. A multi-mode heat pump tobacco curing system comprises a controller, a variable frequency compressor, a four-way reversing valve, an outdoor heat exchanger, an indoor heat exchanger and a sensor group, wherein the variable frequency compressor, the four-way reversing valve and the outdoor heat exchanger are connected with the controller; an adjustable air door is arranged at the inlet of the heat exchange air box, and a variable frequency fan is arranged at the outlet of the heat exchange air box; a first air cavity and a second air cavity are independently arranged in the heat exchange air box in a split mode, and inlets and outlets of the first air cavity and the second air cavity are communicated together; the indoor heat exchanger comprises a first indoor heat exchanger and a second indoor heat exchanger which are respectively and correspondingly arranged in the first air cavity and the second air cavity; one end of the outdoor heat exchanger and the variable frequency compressor are connected to the four-way reversing valve, and the other end of the outdoor heat exchanger is connected with the first indoor heat exchanger and the second indoor heat exchanger; the sensor group comprises a first temperature and humidity sensor arranged at the outlet of the heat exchange air box, a second temperature and humidity sensor arranged at the inlet of the heat exchange air box, a third temperature and humidity sensor in the baking room and a temperature and pressure sensor arranged on a pipeline connected with the air inlet of the variable frequency compressor, and data signals collected by the sensor group are transmitted to the controller; the controller controls the variable-frequency compressor, the variable-frequency fan, the electronic expansion valve and the adjustable air door according to actual working conditions;
the outlet of the frequency conversion compressor is connected with a first connecting port of the four-way reversing valve, a second connecting port of the four-way reversing valve is connected with one end of the outdoor heat exchanger, a third connecting port is communicated with the inlet of the frequency conversion compressor, and a fourth connecting port is connected with one end of a second indoor heat exchanger; the other end of the outdoor heat exchanger is respectively connected with one end of the first indoor heat exchanger and the inlet of the first one-way valve, the outlet of the first one-way valve is respectively connected with one end of the electronic expansion valve and the inlet of the second one-way valve, the outlet of the second one-way valve is connected with the other end of the first indoor heat exchanger, and the other end of the electronic expansion valve is connected with the other end of the second indoor heat exchanger;
the switching between the first working state and the second working state is realized by the difference of the conduction modes inside the four connectors of the four-way reversing valve;
the first working state is as follows: the first interface of the four-way reversing valve is communicated with the inside of the second interface, and the third interface is communicated with the inside of the fourth interface;
the second working state is as follows: the first interface and the fourth interface of the four-way reversing valve are internally communicated, and the second interface and the third interface are internally communicated;
the controller is used for controlling the system to switch among a heating mode, a heating dehumidification mode, a dehumidification mode and a temperature adjustment dehumidification mode; the method specifically comprises the following steps:
when the temperature rising mode is executed, the system regulation and control specifically comprise: the variable frequency compressor is started, the four-way reversing valve is switched to a second working state, the electronic expansion valve is opened, the outdoor heat exchanger fan is opened, the adjustable air door closes the inlet of the first air cavity, the inlet of the second air cavity is completely opened, and the variable frequency fan is started;
when the temperature-rise dehumidification mode is executed, the system is specifically regulated and controlled as follows: the variable frequency compressor is started, the four-way reversing valve is switched to a second working state, the electronic expansion valve is opened, the outdoor heat exchanger fan is opened, the adjustable air door simultaneously opens the inlet of the first air cavity and the inlet of the second air cavity, and the variable frequency fan is opened;
when the temperature adjusting and dehumidifying mode is executed, the system is specifically regulated and controlled as follows: the variable frequency compressor is started, the four-way reversing valve is switched to a first working state, the electronic expansion valve is opened, the outdoor heat exchanger fan is opened, the adjustable air door closes the inlet of the first air cavity, and the variable frequency fan is opened;
when the dehumidification mode is executed, the system is specifically controlled as follows: the variable frequency compressor is started, the four-way reversing valve is switched to the second working state, the electronic expansion valve is started, the outdoor heat exchanger fan is closed, the adjustable air door simultaneously opens the inlet of the first air cavity and the inlet of the second air cavity, and the variable frequency fan is started.
2. The control method realized by the multi-mode heat pump flue-cured tobacco system based on claim 1 is characterized in that: the control method comprises the following implementation steps:
1) according to different process requirements of flue-cured tobacco, after the multi-mode heat pump flue-cured tobacco system is started, the target temperature t of indoor air of the flue-cured tobacco is set through the controller0Eyes of HemuTarget relative humidity
Figure FDA0003503252140000031
Setting the maximum upward deviation value delta t of the target temperatureuAnd maximum downward deviation value of Δ td，ΔtuAnd Δ tdIn the range of 1-10 ℃; the maximum upward deviation value of the target relative humidity is
Figure FDA0003503252140000032
Figure FDA0003503252140000033
In the range of 0-20%;
2) the controller is used for setting the upper limit value dt of indoor temperature rise or temperature drop rate of the flue-cured tobacco under different working modesuAnd a lower limit value dtd，dtuAnd dtdIn the range of 0.1-5 ℃ per minute, and an upper limit value of the dehumidification rate
Figure FDA0003503252140000034
And lower limit value
Figure FDA0003503252140000035
And
Figure FDA0003503252140000036
in the range of 0.1% -5% per minute; meanwhile, timing the starting time of the system, wherein the accumulated working time is tau;
3) third sensor detects current air temperature t in flue-cured tobacco room in real time in unit working process1And relative humidity
Figure FDA0003503252140000037
The difference value between the current air temperature and the target temperature in the flue-cured tobacco chamber and the difference value between the current air humidity and the target humidity are judged by the controller, and a corresponding system working mode is selected by the controller;
4) during the operation period of the heat pump tobacco curing system, the accumulated working time tau is compared with the systemUnify the Preset detection time Interval τsSize, τsThe range is 1-10 min; if taus>Tau, the system keeps the current working mode unchanged; if tausAnd (4) zero clearing is carried out on tau if tau is less than or equal to tau, and the system returns to the step 3) to continuously judge and adjust the working state.
3. The control method according to claim 2, characterized in that: in step 3), according to the judgment result of the controller, the system selects and executes a corresponding heating mode, a heating dehumidification mode, a dehumidification mode or a temperature regulation dehumidification mode, specifically:
31) if t1-t0＜-ΔtdAnd is provided with
Figure FDA0003503252140000038
The system executes a heating mode, the controller calculates the actual temperature rise rate dt in the flue-cured tobacco chamber, and the actual temperature rise rate dt and the target temperature rise rate upper limit value dtuLower limit value dtdComparing, and performing system regulation and control according to a comparison result;
32) if t1-t0＜-ΔtdAnd is
Figure FDA0003503252140000041
The system executes a heating and dehumidifying mode, and the controller calculates the actual dehumidifying rate in the flue-cured tobacco chamber
Figure FDA0003503252140000042
And comparing the actual dehumidification rates
Figure FDA0003503252140000043
And the target upper limit value of dehumidification rate
Figure FDA0003503252140000044
Lower limit value
Figure FDA0003503252140000045
Calculating the actual temperature rise rate dt in the flue-cured tobacco chamber and comparing the actual temperature rise rate dt and upper limit value dt of target temperature rise rateuLower limit value dtdPerforming system regulation and control according to the comparison result;
33) if- Δ td≤t1-t0≤ΔtuAnd is
Figure FDA0003503252140000046
The system executes a dehumidification mode, and the controller calculates the evaporation temperature t according to the refrigerant pressure collected by the temperature and pressure sensoreComparison of the evaporating temperature teAnd a preset minimum evaporation temperature tsCalculating the actual dehumidification rate in the flue-cured tobacco chamber
Figure FDA0003503252140000047
And comparing the actual dehumidification rates
Figure FDA0003503252140000048
And the target upper limit value of dehumidification rate
Figure FDA0003503252140000049
Lower limit value
Figure FDA00035032521400000410
Performing system regulation and control according to the comparison result;
34) if t1-t0＞-ΔtdAnd is
Figure FDA00035032521400000411
The controller controls the frequency conversion compressor to shut down and closes the outdoor heat exchanger fan, the electronic expansion valve and the frequency conversion fan;
35) if t1-t0＞ΔtuAnd is
Figure FDA00035032521400000412
The system executes a temperature-adjusting dehumidification mode, and the controller calculates the actual dehumidification rate in the tobacco-curing chamber
Figure FDA00035032521400000413
And comparing the actual dehumidification rates
Figure FDA00035032521400000414
And the target upper limit value of dehumidification rate
Figure FDA00035032521400000415
Lower limit value
Figure FDA00035032521400000416
Calculating the actual temperature drop rate dt in the tobacco curing chamber, and comparing the actual temperature drop rate dt with the target temperature drop rate upper limit value dtuLower limit value dtdAnd carrying out system regulation and control according to the comparison result.
4. The control method according to claim 3, characterized in that: the actual rate of temperature rise or drop dt is per regulation period tausThe average value of the internal temperature rise or the temperature drop rate is calculated according to the following formula:
Figure FDA0003503252140000051
wherein q is the mass flow of air flowing through the heat exchange air box and the unit is m3/s；tioThe temperature difference of the inlet and the outlet of the heat exchange air box is measured in units of temperature; vdryIs the air volume in the flue-cured tobacco chamber, and the unit is m3；
The actual dehumidification rate
Figure FDA0003503252140000052
For each regulation period tausThe average value of the inner dehumidification rate is calculated by the following formula:
Figure FDA0003503252140000053
wherein
Figure FDA0003503252140000054
The difference value of the relative moisture content of the inlet and the outlet of the heat exchange air box is obtained.
5. The control method according to claim 3, characterized in that: comparing the upper limit value dt of the target temperature rise rate according to the actual temperature rise rate dt in the step 31)uLower limit value dtdAs a result, the controller specifically regulates the system as follows:
if dt > dtuReducing the rotating speed of the variable frequency compressor, and adjusting the rotating speed of the fan of the outdoor heat exchanger, the opening degree of the electronic expansion valve and the rotating speed of the variable frequency fan to adapt to the change of the rotating speed of the variable frequency compressor;
if dt < dtdIncreasing the rotating speed of the variable frequency compressor, and simultaneously adjusting the rotating speed of the fan of the outdoor heat exchanger, the opening degree of the electronic expansion valve and the rotating speed of the variable frequency fan to adapt to the change of the rotating speed of the variable frequency compressor;
if dtu≥dt≥dtdThe system operating parameters are not adjusted.
6. The control method according to claim 3, characterized in that: step 32) according to the actual dehumidification rate
Figure FDA0003503252140000055
Comparing the upper limit of the target dehumidification rate
Figure FDA0003503252140000056
Lower limit value
Figure FDA0003503252140000057
As a result, the controller specifically regulates the system as follows:
if it is
Figure FDA0003503252140000061
The opening degree of the adjustable air door is reduced; if it is
Figure FDA0003503252140000062
Increasing the opening degree of the adjustable air door;
if it is
Figure FDA0003503252140000063
The opening degree of the adjustable air door is not changed; then, the controller compares the upper limit value dt of the target temperature rise rate according to the actual temperature rise rate dtuLower limit value dtdAs a result, the controller regulates and controls the system, specifically:
if dt > dtuReducing the rotating speed of the variable frequency compressor, and simultaneously adjusting the air speed of the outdoor heat exchanger fan, the opening of the electronic expansion valve and the air speed of the variable frequency fan to adapt to the change of the rotating speed of the compressor; if dt < dtdIncreasing the rotating speed of the variable frequency compressor, and simultaneously adjusting the air speed of the outdoor heat exchanger fan, the opening of the electronic expansion valve and the air speed of the variable frequency fan to adapt to the change of the rotating speed of the variable frequency compressor; if dtu≥dt≥dtdThe system operating parameters are not adjusted.
7. The control method according to claim 3, characterized in that: based on the calculated evaporation temperature t in step 33)eAnd a preset minimum evaporation temperature tsThe controller specifically regulates and controls the system according to the comparison result of (1):
if te＜tsImmediately reducing the rotating speed of the variable frequency compressor, and simultaneously adjusting the fan speed of the outdoor heat exchanger, the opening of the electronic expansion valve and the fan speed to adapt to the change of the rotating speed of the compressor;
if te≥tsIf so, no adjustment is performed; then, the controller is based on the actual dehumidification rate
Figure FDA0003503252140000064
Comparing the upper limit of the target dehumidification rate
Figure FDA0003503252140000065
Lower limit value
Figure FDA0003503252140000066
As a result, the controller regulates and controls the system, specifically:
if it is
Figure FDA0003503252140000067
The opening of the adjustable air door and the rotating speed of the variable frequency compressor are reduced, and the wind speed of the outdoor heat exchanger fan, the opening of the electronic expansion valve and the wind speed of the variable frequency fan are adjusted to adapt to the change of the rotating speed of the variable frequency compressor; if it is
Figure FDA0003503252140000068
Increasing the opening of the adjustable air door and the rotating speed of the variable frequency compressor, and simultaneously adjusting the wind speed of the outdoor heat exchanger fan, the opening of the electronic expansion valve and the wind speed of the variable frequency fan to adapt to the change of the rotating speed of the variable frequency compressor; if it is
Figure FDA0003503252140000071
The opening degree of the adjustable air door and the rotating speed of the variable-frequency compressor are not changed.
8. The control method according to claim 3, characterized in that: step 35) according to the actual dehumidification rate
Figure FDA0003503252140000072
Comparing the upper limit of the target dehumidification rate
Figure FDA0003503252140000073
Lower limit value
Figure FDA0003503252140000074
As a result, the controller specifically regulates the system as follows:
if it is
Figure FDA0003503252140000075
Reducing the rotating speed of the variable frequency fan; if it is
Figure FDA0003503252140000076
Then increaseThe rotating speed of the high-frequency conversion fan is increased;
if it is
Figure FDA0003503252140000077
Then not adjusting; then, the controller compares the upper limit value dt of the target temperature rise rate according to the actual temperature rise rate dtuLower limit value dtdAs a result, the controller regulates and controls the system, specifically:
if dt > dtuReducing the rotating speed of the variable frequency compressor, and simultaneously adjusting the wind speed of the outdoor heat exchanger fan, the opening of the electronic expansion valve and the wind speed of the variable frequency fan to adapt to the change of the rotating speed of the variable frequency compressor; if dt < dtdIncreasing the rotating speed of the variable frequency compressor, and simultaneously adjusting the wind speed of the outdoor heat exchanger fan, the opening of the electronic expansion valve and the wind speed of the variable frequency fan to adapt to the change of the rotating speed of the variable frequency compressor; if dtu≥dt≥dtdThe system operating parameters are not adjusted.
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