CN117626615A - Refrigerant regenerative cycle two-stage dehumidification heat pump clothes dryer, system, control method and storage medium - Google Patents
Refrigerant regenerative cycle two-stage dehumidification heat pump clothes dryer, system, control method and storage medium Download PDFInfo
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- 239000003507 refrigerant Substances 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 63
- 238000007791 dehumidification Methods 0.000 title claims abstract description 47
- 230000001172 regenerating effect Effects 0.000 title claims abstract description 38
- 238000004781 supercooling Methods 0.000 claims abstract description 51
- 238000001035 drying Methods 0.000 claims description 304
- 230000009191 jumping Effects 0.000 claims description 11
- 229920006395 saturated elastomer Polymers 0.000 claims description 10
- 230000001276 controlling effect Effects 0.000 description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 239000012071 phase Substances 0.000 description 8
- 239000007788 liquid Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 239000007791 liquid phase Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004590 computer program Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000000638 solvent extraction Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000011555 saturated liquid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F58/00—Domestic laundry dryers
- D06F58/32—Control of operations performed in domestic laundry dryers
- D06F58/34—Control of operations performed in domestic laundry dryers characterised by the purpose or target of the control
- D06F58/36—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
- D06F34/04—Signal transfer or data transmission arrangements
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/02—Characteristics of laundry or load
- D06F2103/08—Humidity
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/58—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers related to condensation, e.g. condensate water level
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
- D06F2105/26—Heat pumps
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
- D06F2105/36—Condensing arrangements, e.g. control of water injection therefor
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention relates to a refrigerant regenerative cycle two-stage dehumidification heat pump clothes dryer, a system, a control method and a storage medium, wherein the method comprises the following steps: collecting the temperature at the outlet of the condenser, and recording the temperature as a first temperature; calculating the supercooling degree through the saturation temperature corresponding to the first temperature and the actual pressure in the condenser; judging whether the calculated supercooling degree reaches a supercooling degree threshold value; collecting the temperature at the outlet of the evaporator and recording the temperature as a second temperature; calculating the superheat degree through the second temperature and the saturation temperature corresponding to the actual pressure in the evaporator; judging whether the calculated superheat degree reaches a superheat degree threshold value or not; and adjusting the opening degree of the throttle valve according to the supercooling degree judgment result and the superheat degree judgment result. The refrigerant at the outlet of the condenser and the refrigerant at the outlet of the second evaporator exchange heat again in the heat regenerator, so that the supercooling degree of the refrigerant in the condenser is further improved, and the refrigerating capacity of the system is improved; the superheat degree of the outlet of the second evaporator is improved, the overheat of the return air can be ensured to be in a reasonable range, and the reliability is improved.
Description
Technical Field
The invention relates to the technical field of heat pump clothes dryers, in particular to a refrigerant regenerative cycle two-stage dehumidification heat pump clothes dryer, a system, a control method and a storage medium.
Background
Among clothes dryers, the heat pump technology is the most efficient way to save energy in the process of drying clothes, and thus is widely used. At present, in a drying stage of a heat pump type clothes dryer, dehumidification and temperature reduction are carried out through an evaporator of a heat pump system, wet and hot air at an outlet of a roller is processed into dry and cold air, and then the dry and cold air is heated by a condenser to be required dry and hot air, and the required dry and hot air enters the roller for drying.
The state of the gas-phase refrigerant is measured by the superheat degree, the superheat degree of the saturated gas-phase refrigerant is 0K, the state of the gas-liquid two-phase refrigerant is measured by the dryness degree, the dryness of the gas-liquid two-phase refrigerant is more than 0 and less than 1, the dryness of the saturated gas-phase refrigerant is 1, the dryness of the saturated liquid-phase refrigerant is 0, the state of the liquid-phase refrigerant is measured by the supercooling degree, and the supercooling degree of the saturated liquid-phase refrigerant is 0K.
In a heat pump system, the superheat degree of the refrigerant at the outlet of an evaporator needs to be controlled, and the heat exchange capacity of the evaporator cannot be fully utilized due to the higher superheat degree, so that the system efficiency is reduced. In some cases, the supercooling degree of the refrigerant at the outlet of the condenser needs to be controlled, and if the supercooling degree of the refrigerant at the outlet of the condenser is high, the heat exchange capacity of the condenser is not fully utilized.
Disclosure of Invention
To achieve the above and other advantages and in accordance with the purpose of the present invention, a first object of the present invention is to provide a control method of a refrigerant regenerative cycle dual-stage dehumidification heat pump clothes dryer system, comprising the steps of:
collecting the temperature at the outlet of the condenser, and recording the temperature as a first temperature;
calculating the supercooling degree through the first temperature and the saturation temperature corresponding to the actual pressure in the condenser;
judging whether the calculated supercooling degree reaches a supercooling degree threshold value;
collecting the temperature at the outlet of the evaporator and recording the temperature as a second temperature;
calculating the superheat degree through the second temperature and the saturation temperature corresponding to the actual pressure in the evaporator;
judging whether the calculated superheat degree reaches a superheat degree threshold value or not;
and adjusting the opening degree of the throttle valve according to the supercooling degree judgment result and the superheat degree judgment result.
Further, the temperature at the outlet of the collecting evaporator is the temperature at the outlet of the collecting second evaporator;
and calculating the superheat degree through the second temperature and the saturation temperature corresponding to the actual pressure in the second evaporator.
Further, the step of calculating the supercooling degree by the saturation temperature corresponding to the first temperature and the actual pressure in the condenser includes the following steps:
collecting the actual pressure in the condenser;
acquiring a saturation temperature corresponding to the actual pressure in the condenser;
and the saturated temperature corresponding to the actual pressure in the condenser is differed from the first temperature, so that the supercooling degree is obtained.
Further, calculating the superheat degree through the second temperature and the saturation temperature corresponding to the actual pressure in the second evaporator comprises the following steps:
collecting the actual pressure in the second evaporator;
obtaining a saturation temperature corresponding to the actual pressure in the second evaporator;
and (3) carrying out difference between the second temperature and the saturation temperature corresponding to the actual pressure in the second evaporator to obtain the superheat degree.
Further, adjusting the opening degree of the throttle valve according to the supercooling degree judgment result and the superheating degree judgment result includes the steps of:
if the supercooling degree does not reach the supercooling degree threshold value, reducing the opening degree of the first throttle valve;
if the supercooling degree reaches a supercooling degree threshold value, the opening degree of the first throttle valve is kept;
if the supercooling degree exceeds a coldness threshold value, increasing the opening degree of the first throttle valve;
if the superheat degree does not reach the superheat degree threshold value, increasing the opening degree of the second throttle valve;
if the superheat degree reaches a superheat degree threshold value, the opening degree of the second throttle valve is kept;
and if the superheat degree exceeds a heat degree threshold value, reducing the opening degree of the second throttle valve.
Further, the method also comprises the following steps:
judging the current drying stage of the drying process;
acquiring a drying strategy corresponding to the current drying stage;
controlling the opening degrees of the first throttle valve and the second throttle valve through the acquired drying strategy;
if the acquired drying parameter value reaches the target value in the drying strategy corresponding to the current drying stage, entering the next drying stage, and controlling the next drying stage until the whole drying process is completed.
Further, the step of judging the current drying stage of the drying process includes the steps of:
acquiring the acquired humidity value of the clothes and/or the running time of the drying process;
judging whether the acquired humidity value of the clothes and/or the running time of the drying process reach a preset value in the later drying period;
otherwise, judging the current drying stage of the drying process as the drying earlier stage;
and if yes, judging the current drying stage in the drying process as the drying later stage.
Further, the drying strategy corresponding to the drying earlier stage is to control the first throttle valve to throttle and control the second throttle valve to be fully opened;
the corresponding drying strategy in the later drying stage is to control the first throttle valve to be fully opened and control the second throttle valve to throttle;
the target numerical value in the drying strategy corresponding to the drying earlier stage comprises a target humidity numerical value;
the target value in the drying strategy corresponding to the drying later stage comprises a target temperature value.
Further, the controlling the opening degrees of the first throttle valve and the second throttle valve through the obtained drying strategy comprises the following steps:
when the current drying stage of the drying process is the drying earlier stage, controlling the first throttle valve to throttle, and controlling the second throttle valve to be fully opened;
and when the current drying stage of the drying process is the drying later stage, controlling the first throttle valve to be fully opened and controlling the second throttle valve to throttle.
Further, if the acquired drying parameter value reaches the target value in the drying strategy corresponding to the current drying stage, entering the next drying stage, and controlling the next drying stage until the whole drying process is completed, wherein the method comprises the following steps:
when the current drying stage of the drying process is the drying earlier stage, collecting a clothes humidity value;
judging whether the collected humidity value of the clothes reaches a target humidity value in a drying strategy corresponding to the earlier drying stage;
otherwise, increasing the opening degree of the first throttle valve, controlling the second throttle valve to be fully opened, and jumping to acquire a clothes humidity value when the current drying stage of the drying process is the drying earlier stage;
if yes, entering a drying later stage, and controlling the drying later stage;
when the current drying stage of the drying process is the drying later stage, acquiring a clothes temperature value;
judging whether the acquired clothes temperature value reaches a target temperature value in a drying strategy corresponding to the later drying period;
otherwise, controlling the first throttle valve to be fully opened, increasing the opening degree of the second throttle valve, and jumping to acquire a clothes temperature value when the current drying stage of the drying process is the drying later stage;
if yes, the next procedure is executed.
Further, the target value in the drying strategy corresponding to the drying later stage further comprises a target humidity value;
if the acquired drying parameter value reaches the target value in the drying strategy corresponding to the current drying stage, entering the next drying stage, and controlling the next drying stage until the whole drying process is completed, wherein the method further comprises the following steps:
when the current drying stage of the drying process is the drying later stage, collecting a clothes humidity value;
judging whether the collected humidity value of the clothes reaches a target humidity value in a drying strategy corresponding to the later drying period;
otherwise, acquiring a clothes temperature value, and judging whether the acquired clothes temperature value reaches a target temperature value in a drying strategy corresponding to the later drying period; otherwise, controlling the first throttle valve to be fully opened, increasing the opening degree of the second throttle valve, and jumping to acquire a clothes humidity value when the current drying stage in the drying process is the drying later stage; if yes, keeping the first throttle valve fully open, keeping or reducing the current opening degree of the second throttle valve, and jumping to acquire a clothes humidity value when the current drying stage of the drying process is the drying later stage;
if yes, the next procedure is executed.
A second object of the present invention is to provide a computer-readable storage medium having program instructions stored thereon, which when executed, implement a control method of a refrigerant regenerative cycle dual-stage dehumidification heat pump clothes dryer system.
A third object of the present invention is to provide a refrigerant regenerative cycle dual-stage dehumidification heat pump clothes dryer system, comprising: the control method of the refrigerant regenerative cycle two-stage dehumidification heat pump clothes dryer system comprises a compressor, a condenser, a first throttle valve, a first evaporator, a heat regenerator and a controller, wherein an exhaust pipe of the compressor is connected with an inlet of the condenser, an outlet of the condenser is connected with a hot end inlet of the heat regenerator, a hot end outlet of the heat regenerator is connected with an inlet of the first evaporator through the first throttle valve, an outlet of the first evaporator is connected with a cold end inlet of the heat regenerator, a cold end outlet of the heat regenerator is connected with an air suction pipe of the compressor, and the controller is used for executing the control method of the refrigerant regenerative cycle two-stage dehumidification heat pump clothes dryer system.
Further, the device also comprises a second throttle valve and a second evaporator, wherein the outlet of the first evaporator is connected with the inlet of the second evaporator through the second throttle valve, and the outlet of the second evaporator is connected with the cold end inlet of the heat regenerator.
The invention provides a refrigerant regenerative cycle double-stage dehumidification heat pump clothes dryer, which comprises a clothes dryer body and a refrigerant regenerative cycle double-stage dehumidification heat pump clothes dryer system arranged in the clothes dryer body.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a refrigerant regenerative cycle two-stage dehumidification heat pump clothes dryer, a system, a control method and a storage medium.
Through the system design of the invention, the refrigerant at the outlet of the condenser and the refrigerant at the outlet of the second evaporator exchange heat again in the heat regenerator, the supercooling degree of the refrigerant in the condenser is further improved, and the refrigerating capacity of the system is improved; meanwhile, the superheat degree of the outlet of the second evaporator is improved, the return air superheat can be ensured to be in a reasonable range, and the reliability is improved. Therefore, the system design of the invention can improve the capacity and the reliability thereof on the basis of the original system.
According to the invention, a two-stage dehumidification scheme is adopted, and different operation modes are selected in different drying stages, so that the optimal energy efficiency is realized. In the initial drying stage, the moisture content of clothes is maximum, at the moment, the dehumidifying energy efficiency is higher, the first throttle valve is controlled to throttle, the second throttle valve is fully opened, and precooling and dehumidifying are simultaneously carried out, so that the maximum treatment of the wet load in the early dehumidifying stage is realized; at the later stage of drying, the clothes moisture content is lower, the dehumidification energy efficiency is lower, the influence of temperature on drying efficiency is greater than humidity at the moment, the first throttle valve is fully opened, the second throttle valve is throttled, the area of the condenser is increased, the air outlet temperature is increased, the aim of controlling the drying efficiency in a partitioning mode is fulfilled, the energy consumption of the drying process is reduced, and the drying efficiency is improved.
The foregoing description is only an overview of the present invention, and is intended to provide a better understanding of the present invention, as it is embodied in the following description, with reference to the preferred embodiments of the present invention and the accompanying drawings. Specific embodiments of the present invention are given in detail by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
FIG. 1 is a schematic diagram of a refrigerant regenerative cycle dual-stage dehumidification heat pump clothes dryer system of example 1;
fig. 2 is a supercooling degree control flowchart of embodiment 3;
fig. 3 is a flow chart of superheat control in example 3;
FIG. 4 is a two-stage dehumidification flow chart of example 3;
fig. 5 is a schematic diagram of an electronic device of embodiment 4;
fig. 6 is a schematic block diagram of a computer-readable storage medium of embodiment 5.
In the accompanying drawings: 1. a compressor; 2. a condenser; 3. a first throttle valve; 4. a first evaporator; 5. a second throttle valve; 6. a second evaporator; 7. a roller; 8. a heat regenerator.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and detailed description, wherein it is to be understood that, on the premise of no conflict, the following embodiments or technical features may be arbitrarily combined to form new embodiments.
Example 1
A refrigerant regenerative cycle dual-stage dehumidification heat pump clothes dryer system, as shown in fig. 1, comprising: the compressor 1, the condenser 2, the first throttle valve 3, the first evaporator 4, the regenerator 8 and the controller, wherein an exhaust pipe of the compressor 1 is connected with an inlet of the condenser 2, an outlet of the condenser 2 is connected with a hot end inlet of the regenerator 8, a hot end outlet of the regenerator 8 is connected with an inlet of the first evaporator 4 through the first throttle valve 3, an outlet of the first evaporator 4 is connected with a cold end inlet of the regenerator 8, a cold end outlet of the regenerator 8 is connected with an air suction pipe of the compressor 1, and the controller is used for executing a control method of the refrigerant regenerative cycle double-stage dehumidification heat pump clothes dryer system.
In order to select different operation modes in different drying stages, the energy efficiency is optimized. In the embodiment, a two-stage dehumidification scheme is adopted, pre-cooling treatment is carried out before air mixing, and deep dehumidification is carried out after air mixing. The system thus also comprises a second throttle valve 5, a second evaporator 6, the outlet of the first evaporator 4 being connected via the second throttle valve 5 to the inlet of the second evaporator 6, the outlet of the second evaporator 6 being connected to the cold end inlet of the regenerator 8.
The compressor 1, the condenser 2, the first throttle valve 3, the first evaporator 4, the second throttle valve 5, the second evaporator 6 and the regenerator 8 form a refrigerant loop. The compressor 1 pressurizes and heats the refrigerant, the refrigerant is sent into the condenser 2 to release heat, the condenser 2 is connected with an air path in the clothes dryer, and hot dry air is output. The refrigerant enters the hot end inlet of the heat regenerator 8 from the condenser 2, enters the first evaporator 4 from the hot end outlet of the heat regenerator 8 through the first throttle valve 3, then enters the second evaporator 6 through the second throttle valve 5, so that the pressure and the temperature are quickly reduced, the heat energy is absorbed, and the temperature is lower than the condensation point. The evaporator 6 is connected to the drying air path to change the moist hot air into dry cold air, where the water vapor in the laundry condenses into droplets and is collected by the water collecting tray. The refrigerant enters the cold end inlet of the heat regenerator 8 from the outlet of the second evaporator 6, and enters the air return port of the compressor 1 from the cold end outlet of the heat regenerator 8. The heat of the refrigerant at the outlet of the condenser 2 and the refrigerant at the outlet of the second evaporator 6 is exchanged again in the heat regenerator 8, the supercooling degree of the refrigerant in the condenser 2 is further improved, and the refrigerating capacity of the system is improved; meanwhile, the superheat degree of the outlet of the second evaporator 6 is improved, the return air superheat can be ensured to be in a reasonable range, and the reliability is improved.
The condenser 2, the first evaporator 4 and the second evaporator 6 form an air circulation loop. The drying fan sends the hot air heated by the condenser 2 into the roller 7, the clothes in the roller 7 are heated and fully tumbled at the position, the moisture in the clothes is accelerated to evaporate into steam (moist hot air), the drying filter screen captures fluff, fragments and the like falling off from the clothes, the fluff and the fragments enter the second evaporator 6 and the first evaporator 4 in sequence, the moisture in the clothes is condensed into small water drops, the small water drops become dry cold air, and the dry cold air continuously enters the condenser 2. The water vapor in the clothes is changed into water drops and then is collected in the water collecting tray. The drain pump pumps the condensed water of the water collecting disc to a high position, and the condensed water is sent to the water storage box for storage. And repeating the process until the humidity sensor judges that the moisture in the clothes reaches the set target, and ending the drying process.
According to the refrigerant backheating circulation two-stage dehumidification heat pump clothes dryer system provided by the invention, the refrigerant at the outlet of the condenser 2 and the refrigerant at the outlet of the second evaporator 6 exchange heat again in the regenerator 8, so that the supercooling degree of the refrigerant in the condenser 2 is further improved, and the refrigerating capacity of the system is improved; meanwhile, the superheat degree of the outlet of the second evaporator 6 is improved, the return air superheat can be ensured to be in a reasonable range, and the reliability is improved. Therefore, the system design of the invention can improve the capacity and the reliability thereof on the basis of the original system.
According to the invention, different operation modes can be optimally selected according to energy efficiency in different drying stages, such as: in the initial stage of drying, the moisture content of clothes is maximum, and the dehumidifying energy efficiency is higher at the moment, so that the first throttle valve 3 is controlled to throttle, the second throttle valve 5 is controlled to be fully opened, and the precooling and the dehumidifying are simultaneously carried out, so that the maximum treatment moisture load in the early stage of dehumidifying is realized; in the later drying stage, the clothes moisture content is lower, the dehumidifying energy efficiency is lower, and the influence of the temperature on the drying efficiency is larger than the humidity, so that the first throttle valve 3 is controlled to be fully opened, the second throttle valve 5 is controlled to be throttled, the area of a condenser is increased, the air outlet temperature is increased, the aim of controlling the drying efficiency in a partitioning mode is fulfilled, and the drying efficiency is more efficient and energy-saving.
Example 2
A refrigerant regenerative cycle double-stage dehumidification heat pump clothes dryer comprises a clothes dryer body and a refrigerant regenerative cycle double-stage dehumidification heat pump clothes dryer system arranged in the clothes dryer body. For a detailed description of the refrigerant regenerative cycle dual-stage dehumidification heat pump clothes dryer system, reference may be made to the corresponding description in the above system embodiments, and no further description is given here.
Example 3
The control method of the refrigerant regenerative cycle two-stage dehumidification heat pump clothes dryer system of the embodiment 1, as shown in fig. 2 and 3, comprises the following steps:
collecting the temperature at the outlet of the condenser, and recording the temperature as a first temperature;
calculating the supercooling degree through the saturation temperature corresponding to the first temperature and the actual pressure in the condenser; specifically, the method comprises the following steps:
collecting the actual pressure in the condenser;
obtaining a saturation temperature corresponding to the actual pressure in the condenser; the saturation temperature corresponding to the actual pressure in the condenser can be obtained through a temperature-pressure comparison table of the refrigerant. Taking R22 refrigerant as an example, when the pressure in the collected condenser is 1.64MPa, the saturation temperature is 45 ℃.
And (3) the saturated temperature corresponding to the actual pressure in the condenser is different from the first temperature, so that the supercooling degree is obtained. The collected temperature at the outlet of the condenser is assumed to be 40 ℃ and 5 ℃ lower than the saturation temperature corresponding to the actual pressure in the condenser, and the state is called supercooling, and the refrigerant flowing out at the moment has the supercooling degree of 5 ℃.
If the supercooling degree is not achieved, the pressure of the liquid in the two-phase refrigerant is slightly lost in the liquid pipe, the liquid can flash, saturated liquid can be evaporated inevitably due to the reduction of the pressure, the dryness of the two-phase refrigerant finally reaching the evaporator is far greater than that of the designed two-phase refrigerant, the liquid phase component is reduced, the evaporation capacity of the evaporator cannot be met, and the refrigerating effect can be reduced. The supercooling degree is reasonably increased, and the unit refrigerating capacity and the coefficient of performance are both increased. Therefore, it is also necessary to determine whether the calculated supercooling degree reaches the supercooling degree threshold.
Collecting the temperature at the outlet of the evaporator and recording the temperature as a second temperature;
calculating the superheat degree through the second temperature and the saturation temperature corresponding to the actual pressure in the evaporator;
when different operation modes are selected in different drying stages to realize optimal energy efficiency, and a two-stage dehumidification scheme is adopted, the temperature at the outlet of the acquisition evaporator is the temperature at the outlet of the acquisition second evaporator; and calculating the superheat degree through the second temperature and the saturated temperature corresponding to the actual pressure in the evaporator, wherein the superheat degree is calculated through the second temperature and the saturated temperature corresponding to the actual pressure in the second evaporator. Specifically, the method comprises the following steps:
collecting the actual pressure in the second evaporator;
obtaining a saturation temperature corresponding to the actual pressure in the second evaporator; the saturation temperature corresponding to the actual pressure in the second evaporator can be obtained through a temperature-pressure comparison table of the refrigerant.
And (3) carrying out difference between the second temperature and the saturated temperature corresponding to the actual pressure in the second evaporator to obtain the superheat degree. Taking the R22 refrigerant as an example, when the obtained saturation temperature corresponding to the actual pressure in the second evaporator is 5 ℃, the collected temperature at the outlet of the second evaporator is 10 ℃ and is 5 ℃ higher than the saturation temperature corresponding to the actual pressure in the second evaporator, the state is called overheat, and the refrigerant flowing out at the moment has a superheat degree of 5 ℃.
In order to ensure safe operation of the compressor and prevent liquid impact, the suction temperature is required to be slightly higher than the evaporation temperature, a certain suction superheat degree is required, no liquid refrigerant can enter the compressor, wet stroke is prevented, and the suction superheat degree can be realized by adjusting the opening degree of a throttle valve. Therefore, it is also necessary to determine whether the calculated degree of superheat reaches the degree of superheat threshold.
And adjusting the opening degree of the throttle valve according to the supercooling degree judgment result and the superheat degree judgment result. The method specifically comprises the following steps:
if the supercooling degree does not reach the supercooling degree threshold value, the opening degree of the first throttle valve is reduced so as to increase the refrigerant in the condenser and improve the condensing effect.
If the supercooling degree reaches the supercooling degree threshold value, the opening degree of the first throttle valve is kept;
if the supercooling degree exceeds the coldness threshold value, the opening degree of the first throttle valve is increased so as to reduce the refrigerant in the condenser, increase the refrigerant gas and improve the refrigerating capacity;
if the superheat degree does not reach the superheat degree threshold value, increasing the opening degree of the second throttle valve, increasing the refrigerant supply quantity of the evaporator and improving the suction superheat degree;
if the superheat degree reaches the superheat degree threshold value, the opening degree of the second throttle valve is kept;
if the superheat degree exceeds the heat threshold, the opening degree of the second throttle valve is reduced, the refrigerant supply amount of the evaporator is reduced, and the suction superheat degree is reduced.
In order to select different operation modes in different drying stages of the drying process to achieve optimal energy efficiency, the current drying stage of the drying process needs to be judged first; specifically, as shown in fig. 4, the method comprises the following steps:
acquiring the acquired humidity value of the clothes and/or the running time of the drying process;
when the judged parameters only have the humidity value of the clothes, judging whether the collected humidity value of the clothes reaches the preset humidity value in the later drying period;
otherwise, judging the current drying stage of the drying process as the drying earlier stage;
and if yes, judging the current drying stage in the drying process as the drying later stage.
When the judged parameters are only the running time of the drying process, judging whether the running time of the drying process reaches the starting time of the drying later period or not;
otherwise, judging the current drying stage of the drying process as the drying earlier stage;
and if yes, judging the current drying stage in the drying process as the drying later stage.
When the judged parameters comprise the clothes humidity value and the running time of the drying process, judging whether the acquired clothes humidity value and the running time of the drying process reach the preset value at the later drying stage;
otherwise, judging the current drying stage of the drying process as the drying earlier stage;
and if yes, judging the current drying stage in the drying process as the drying later stage.
And acquiring a drying strategy corresponding to the current drying stage. The clothes moisture content is maximum in the early stage of the drying stage, and the dehumidifying energy efficiency is high at the moment, so that the corresponding drying strategy in the early stage of drying is to control the first throttle valve to throttle, control the second throttle valve to be fully opened, and simultaneously perform precooling and dehumidifying, thereby realizing the maximized treatment of the wet load in the early stage of dehumidifying.
Because the moisture content is not high at the later drying stage, the dehumidifying energy efficiency is lower, and the influence of the temperature on the drying efficiency is larger than the humidity, the corresponding drying strategy at the later drying stage is to control the first throttle valve to be fully opened, control the second throttle valve to throttle, increase the area of the condenser and improve the air outlet temperature. The aim of partition control of the drying efficiency is achieved by dividing the drying earlier stage and the drying later stage and setting corresponding drying strategies.
Controlling the opening degrees of the first throttle valve and the second throttle valve through the acquired drying strategy; wherein,
when the current drying stage of the drying process is the drying earlier stage, controlling the first throttle valve to throttle, and controlling the second throttle valve to be fully opened;
and when the current drying stage of the drying process is the drying later stage, controlling the first throttle valve to be fully opened and controlling the second throttle valve to throttle.
Collecting a drying parameter value of a current drying stage in a drying process;
judging whether the acquired drying parameter value reaches a target value in a drying strategy corresponding to the current drying stage;
if the acquired drying parameter value reaches the target value in the drying strategy corresponding to the current drying stage, entering the next drying stage, and controlling the next drying stage until the whole drying process is completed.
If the acquired drying parameter value does not reach the target value in the drying strategy corresponding to the current drying stage, continuously regulating and controlling the first throttle valve and the second throttle valve according to the drying strategy corresponding to the current drying stage.
If the acquired drying parameter value reaches the target value in the drying strategy corresponding to the current drying stage, entering the next drying stage, and controlling the next drying stage until the whole drying process is completed.
In the early stage of drying, in order to maximize the treatment of the wet load, the humidity value of the laundry needs to be precisely controlled. Thus, the target value in the drying strategy corresponding to the drying early stage includes the target humidity value.
In the later drying stage, in order to achieve optimal energy efficiency, the temperature of the clothes needs to be accurately controlled. Thus, the target value in the drying strategy corresponding to the drying later period includes the target temperature value.
Combining different target values set in the early drying stage and the later drying stage, judging whether the acquired drying parameter value reaches the target value in the drying strategy corresponding to the current drying stage or not comprises the following steps:
when the current drying stage of the drying process is the drying earlier stage, collecting a clothes humidity value;
judging whether the collected humidity value of the clothes reaches a target humidity value in a drying strategy corresponding to the earlier drying stage;
otherwise, increasing the opening degree of the first throttle valve, increasing the flow of the refrigerant flowing into the first evaporator so as to accelerate the drying of clothes and reduce the humidity of the clothes, controlling the second throttle valve to be fully opened, and jumping to acquire the humidity value of the clothes when the current drying stage of the drying process is the earlier drying stage;
if yes, entering a drying later stage, and controlling the drying later stage;
when the current drying stage of the drying process is the drying later stage, acquiring a clothes temperature value;
judging whether the acquired clothes temperature value reaches a target temperature value in a drying strategy corresponding to the later drying period;
otherwise, controlling the first throttle valve to be fully opened, increasing the opening degree of the second throttle valve, increasing the flow of the refrigerant flowing into the second evaporator, increasing the area of the condenser, and increasing the air outlet temperature;
if yes, the next procedure is executed.
In order to control the humidity of the dried clothes, the target value in the drying strategy corresponding to the later drying stage also comprises a target humidity value. Therefore, judging whether the acquired drying parameter value reaches the target value in the drying strategy corresponding to the drying later stage comprises the following steps:
when the current drying stage of the drying process is the drying later stage, collecting a clothes humidity value;
judging whether the collected humidity value of the clothes reaches a target humidity value in a drying strategy corresponding to the later drying period;
otherwise, acquiring a clothes temperature value, and judging whether the acquired clothes temperature value reaches a target temperature value in a drying strategy corresponding to the later drying period; otherwise, controlling the first throttle valve to be fully opened, increasing the opening degree of the second throttle valve, increasing the flow of the refrigerant flowing into the second evaporator, increasing the area of the condenser, increasing the air outlet temperature, and jumping to acquire the humidity value of clothes when the current drying stage of the drying process is the drying later stage; if yes, keeping the first throttle valve fully open, keeping or reducing the current opening degree of the second throttle valve, maintaining the air outlet temperature, and jumping to acquire the humidity value of clothes when the current drying stage of the drying process is the drying later stage;
if yes, the next procedure is executed.
Example 4
An electronic device 200, as shown in fig. 5, includes, but is not limited to: a memory 201 having program codes stored thereon; a processor 202 coupled to the memory and which when the program code is executed by the processor implements a method of controlling a refrigerant regenerative cycle dual stage dehumidification heat pump dryer system. For detailed description of the method, reference may be made to corresponding descriptions in the above method embodiments, and details are not repeated here.
Example 5
A computer readable storage medium, as shown in fig. 6, has program instructions stored thereon, and the program instructions when executed implement a control method of a refrigerant regenerative cycle two-stage dehumidification heat pump clothes dryer system. For detailed description of the method, reference may be made to corresponding descriptions in the above method embodiments, and details are not repeated here.
Example 6
A computer program product comprising computer programs/instructions which when executed by a processor implement a method of controlling a refrigerant regenerative cycle dual stage dehumidification heat pump dryer system. For detailed description of the method, reference may be made to corresponding descriptions in the above method embodiments, and details are not repeated here.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments.
The foregoing is illustrative of the embodiments of the present disclosure and is not to be construed as limiting the scope of the one or more embodiments of the present disclosure. Various modifications and alterations to one or more embodiments of this description will be apparent to those skilled in the art. Any modifications, equivalent substitutions, improvements, or the like, which are within the spirit and principles of one or more embodiments of the present disclosure, are intended to be included within the scope of the claims of one or more embodiments of the present disclosure. One or more embodiments of the present specification.
Claims (15)
1. The control method of the refrigerant regenerative cycle two-stage dehumidification heat pump clothes dryer system is characterized by comprising the following steps of:
collecting the temperature at the outlet of the condenser, and recording the temperature as a first temperature;
calculating the supercooling degree through the first temperature and the saturation temperature corresponding to the actual pressure in the condenser;
judging whether the calculated supercooling degree reaches a supercooling degree threshold value;
collecting the temperature at the outlet of the evaporator and recording the temperature as a second temperature;
calculating the superheat degree through the second temperature and the saturation temperature corresponding to the actual pressure in the evaporator;
judging whether the calculated superheat degree reaches a superheat degree threshold value or not;
and adjusting the opening degree of the throttle valve according to the supercooling degree judgment result and the superheat degree judgment result.
2. The control method of the refrigerant regenerative cycle two-stage dehumidification heat pump clothes dryer system according to claim 1, wherein the control method comprises the following steps: the temperature at the outlet of the acquisition evaporator is the temperature at the outlet of the acquisition second evaporator;
and calculating the superheat degree through the second temperature and the saturation temperature corresponding to the actual pressure in the second evaporator.
3. The control method of a refrigerant regenerative cycle dual-stage dehumidification heat pump clothes dryer system according to claim 1, wherein said calculating the supercooling degree by the saturation temperature corresponding to the first temperature and the actual pressure in the condenser comprises the steps of:
collecting the actual pressure in the condenser;
acquiring a saturation temperature corresponding to the actual pressure in the condenser;
and the saturated temperature corresponding to the actual pressure in the condenser is differed from the first temperature, so that the supercooling degree is obtained.
4. The control method of a refrigerant regenerative cycle dual-stage dehumidification heat pump clothes dryer system according to claim 2, wherein calculating the superheat through the second temperature and the saturation temperature corresponding to the actual pressure in the second evaporator comprises the steps of:
collecting the actual pressure in the second evaporator;
obtaining a saturation temperature corresponding to the actual pressure in the second evaporator;
and (3) carrying out difference between the second temperature and the saturation temperature corresponding to the actual pressure in the second evaporator to obtain the superheat degree.
5. The control method of a refrigerant regenerative cycle dual-stage dehumidification heat pump clothes dryer system according to claim 2, wherein adjusting the opening degree of the throttle valve according to the supercooling degree judgment result and the superheat degree judgment result comprises the steps of:
if the supercooling degree does not reach the supercooling degree threshold value, reducing the opening degree of the first throttle valve;
if the supercooling degree reaches a supercooling degree threshold value, the opening degree of the first throttle valve is kept;
if the supercooling degree exceeds a coldness threshold value, increasing the opening degree of the first throttle valve;
if the superheat degree does not reach the superheat degree threshold value, increasing the opening degree of the second throttle valve;
if the superheat degree reaches a superheat degree threshold value, the opening degree of the second throttle valve is kept;
and if the superheat degree exceeds a heat degree threshold value, reducing the opening degree of the second throttle valve.
6. The control method of the refrigerant regenerative cycle two-stage dehumidification heat pump clothes dryer system according to claim 2, wherein the control method comprises the following steps: the method also comprises the following steps:
judging the current drying stage of the drying process;
acquiring a drying strategy corresponding to the current drying stage;
controlling the opening degrees of the first throttle valve and the second throttle valve through the acquired drying strategy;
if the acquired drying parameter value reaches the target value in the drying strategy corresponding to the current drying stage, entering the next drying stage, and controlling the next drying stage until the whole drying process is completed.
7. The control method of a refrigerant regenerative cycle dual-stage dehumidification heat pump clothes dryer system of claim 6, wherein said determining a current drying stage of a drying process comprises the steps of:
acquiring the acquired humidity value of the clothes and/or the running time of the drying process;
judging whether the acquired humidity value of the clothes and/or the running time of the drying process reach a preset value in the later drying period;
otherwise, judging the current drying stage of the drying process as the drying earlier stage;
and if yes, judging the current drying stage in the drying process as the drying later stage.
8. The control method of the refrigerant regenerative cycle two-stage dehumidification heat pump clothes dryer system of claim 7, wherein the control method comprises the following steps: the corresponding drying strategy in the early drying stage is to control the first throttle valve to throttle and control the second throttle valve to be fully opened;
the corresponding drying strategy in the later drying stage is to control the first throttle valve to be fully opened and control the second throttle valve to throttle;
the target numerical value in the drying strategy corresponding to the drying earlier stage comprises a target humidity numerical value;
the target value in the drying strategy corresponding to the drying later stage comprises a target temperature value.
9. The control method of a refrigerant regenerative cycle dual-stage dehumidification heat pump clothes dryer system of claim 8, wherein said controlling the opening degree of the first throttle valve and the second throttle valve by the obtained drying strategy comprises the steps of:
when the current drying stage of the drying process is the drying earlier stage, controlling the first throttle valve to throttle, and controlling the second throttle valve to be fully opened;
and when the current drying stage of the drying process is the drying later stage, controlling the first throttle valve to be fully opened and controlling the second throttle valve to throttle.
10. The control method of a refrigerant regenerative cycle two-stage dehumidification heat pump clothes dryer system according to claim 8, wherein if the acquired drying parameter value reaches a target value in a drying strategy corresponding to a current drying stage, entering a next drying stage, and controlling the next drying stage until all drying processes are completed, wherein the method comprises the following steps:
when the current drying stage of the drying process is the drying earlier stage, collecting a clothes humidity value;
judging whether the collected humidity value of the clothes reaches a target humidity value in a drying strategy corresponding to the earlier drying stage;
otherwise, increasing the opening degree of the first throttle valve, controlling the second throttle valve to be fully opened, and jumping to acquire a clothes humidity value when the current drying stage of the drying process is the drying earlier stage;
if yes, entering a drying later stage, and controlling the drying later stage;
when the current drying stage of the drying process is the drying later stage, acquiring a clothes temperature value;
judging whether the acquired clothes temperature value reaches a target temperature value in a drying strategy corresponding to the later drying period;
otherwise, controlling the first throttle valve to be fully opened, increasing the opening degree of the second throttle valve, and jumping to acquire a clothes temperature value when the current drying stage of the drying process is the drying later stage;
if yes, the next procedure is executed.
11. The control method of the refrigerant regenerative cycle two-stage dehumidification heat pump clothes dryer system according to claim 9, wherein the control method comprises the following steps: the target value in the drying strategy corresponding to the drying later stage also comprises a target humidity value;
if the acquired drying parameter value reaches the target value in the drying strategy corresponding to the current drying stage, entering the next drying stage, and controlling the next drying stage until the whole drying process is completed, wherein the method further comprises the following steps:
when the current drying stage of the drying process is the drying later stage, collecting a clothes humidity value;
judging whether the collected humidity value of the clothes reaches a target humidity value in a drying strategy corresponding to the later drying period;
otherwise, acquiring a clothes temperature value, and judging whether the acquired clothes temperature value reaches a target temperature value in a drying strategy corresponding to the later drying period; otherwise, controlling the first throttle valve to be fully opened, increasing the opening degree of the second throttle valve, and jumping to acquire a clothes humidity value when the current drying stage in the drying process is the drying later stage; if yes, keeping the first throttle valve fully open, keeping or reducing the current opening degree of the second throttle valve, and jumping to acquire a clothes humidity value when the current drying stage of the drying process is the drying later stage;
if yes, the next procedure is executed.
12. A computer readable storage medium, having stored thereon program instructions which, when executed, implement the method of any of claims 1 to 11.
13. A refrigerant regenerative cycle dual-stage dehumidification heat pump clothes dryer system, comprising: the control method of the refrigerant regenerative cycle two-stage dehumidification heat pump clothes dryer system comprises a compressor, a condenser, a first throttle valve, a first evaporator, a heat regenerator and a controller, wherein an exhaust pipe of the compressor is connected with an inlet of the condenser, an outlet of the condenser is connected with a hot end inlet of the heat regenerator, a hot end outlet of the heat regenerator is connected with an inlet of the first evaporator through the first throttle valve, an outlet of the first evaporator is connected with a cold end inlet of the heat regenerator, a cold end outlet of the heat regenerator is connected with an air suction pipe of the compressor, and the controller is used for executing the control method of the refrigerant regenerative cycle two-stage dehumidification heat pump clothes dryer system.
14. The refrigerant regenerative cycle dual-stage dehumidification heat pump clothes dryer system of claim 13 wherein: the evaporator further comprises a second throttle valve and a second evaporator, wherein an outlet of the first evaporator is connected with an inlet of the second evaporator through the second throttle valve, and an outlet of the second evaporator is connected with a cold end inlet of the heat regenerator.
15. A refrigerant backheating cycle doublestage dehumidification heat pump clothes dryer which characterized in that: a heat pump clothes dryer system comprising a clothes dryer body and a refrigerant regenerative cycle dual-stage dehumidification heat pump clothes dryer system according to claim 13 disposed within said clothes dryer body.
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