CN112283993A - Refrigeration control method and device and refrigeration equipment - Google Patents
Refrigeration control method and device and refrigeration equipment Download PDFInfo
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- CN112283993A CN112283993A CN202011105018.XA CN202011105018A CN112283993A CN 112283993 A CN112283993 A CN 112283993A CN 202011105018 A CN202011105018 A CN 202011105018A CN 112283993 A CN112283993 A CN 112283993A
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 105
- 238000000034 method Methods 0.000 title claims abstract description 65
- 238000001704 evaporation Methods 0.000 claims abstract description 168
- 230000008020 evaporation Effects 0.000 claims abstract description 137
- 238000001816 cooling Methods 0.000 claims abstract description 36
- 238000012544 monitoring process Methods 0.000 claims abstract description 30
- 230000008569 process Effects 0.000 claims abstract description 26
- 239000007788 liquid Substances 0.000 claims description 15
- 230000009467 reduction Effects 0.000 claims description 6
- 239000003507 refrigerant Substances 0.000 claims description 5
- 238000004590 computer program Methods 0.000 claims description 4
- 230000003247 decreasing effect Effects 0.000 description 5
- 230000029058 respiratory gaseous exchange Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010257 thawing Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
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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
- 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
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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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
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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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/006—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass for preventing frost
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Abstract
The invention discloses a refrigeration control method, a refrigeration control device and refrigeration equipment. Wherein, the method comprises the following steps: monitoring an actual temperature of the target space; when the actual temperature is higher than the first preset temperature, controlling the refrigeration equipment to enter a rapid cooling mode, and controlling the opening degree of the electronic expansion valve in the rapid cooling process to maintain the evaporation temperature at a second preset temperature; and when the actual temperature is less than or equal to the first preset temperature, controlling the opening of the electronic expansion valve to enable the evaporation temperature to be greater than the return air dew point temperature. The invention carries out rapid cooling refrigeration under the high-temperature working condition, ensures that the evaporation temperature is maintained at the second preset temperature without frosting, controls the evaporation temperature to be higher than the return air dew point temperature under the low-temperature working condition, is not easy to frost, simultaneously reduces the dew point temperature by rapid cooling refrigeration, ensures that the evaporation temperature is higher than the return air dew point temperature more easily under the low-temperature working condition, effectively reduces the frosting of an evaporator in the refrigeration process, prolongs the high-efficiency refrigeration time, avoids frequent frosting, and improves the energy efficiency and the reliability.
Description
Technical Field
The invention relates to the technical field of refrigeration control, in particular to a refrigeration control method, a refrigeration control device and refrigeration equipment.
Background
The finned coil heat exchanger of the air cooler for refrigeration is used as an evaporator in a refrigeration house, and the surface temperature of the coil is lower due to lower evaporation temperature. When the surface temperature of the coil pipe is lower than 0 ℃, air in the refrigeration house contacts with the coil pipe under the driving of the fan, moisture contained in the air can be separated out and attached to the surface of the coil pipe to form a frost layer. With the excessive thickening of the frost layer, the performance of the unit is reduced and the reliability is reduced.
At present, defrosting is generally performed after frosting, and no effective solution is provided at present aiming at the problem of how to effectively reduce the frosting of an evaporator.
Disclosure of Invention
The embodiment of the invention provides a refrigeration control method, a refrigeration control device and refrigeration equipment, and aims to at least solve the problem of how to effectively reduce frosting of an evaporator.
In order to solve the above technical problem, an embodiment of the present invention provides a refrigeration control method, including:
monitoring an actual temperature of the target space;
when the actual temperature is higher than a first preset temperature, controlling the refrigeration equipment to enter a rapid cooling mode, and controlling the opening degree of the electronic expansion valve in the rapid cooling process to maintain the evaporation temperature at a second preset temperature;
and when the actual temperature is less than or equal to the first preset temperature, controlling the opening of the electronic expansion valve to enable the evaporation temperature to be greater than the return air dew point temperature.
Optionally, the refrigeration equipment includes an evaporator and a condenser, and at least two electronic expansion valves are connected in parallel between the evaporator and the condenser.
Optionally, controlling the opening of the electronic expansion valve during the rapid cooling process to maintain the evaporating temperature at a second preset temperature, includes:
monitoring the evaporation temperature;
if the evaporation temperature is lower than the second preset temperature, increasing the opening degree of each electronic expansion valve one by one until the evaporation temperature reaches the second preset temperature, wherein if the opening degree of the current electronic expansion valve is maximum but the evaporation temperature is still lower than the second preset temperature, continuing to increase the next electronic expansion valve;
if the evaporation temperature is higher than the second preset temperature, the opening degree of each electronic expansion valve is reduced one by one until the evaporation temperature reaches the second preset temperature, wherein if the opening degree of the current electronic expansion valve is minimum but the evaporation temperature is still higher than the second preset temperature, the next electronic expansion valve is continuously closed.
Optionally, reducing the opening degree of each electronic expansion valve one by one includes:
monitoring the degree of superheat of suction gas in the process of reducing the opening degree of the electronic expansion valve;
and if the suction superheat degree is higher than a third preset temperature but the evaporation temperature is still higher than the second preset temperature, controlling the evaporation fan to perform frequency reduction operation so as to maintain the evaporation temperature at the second preset temperature.
Optionally, controlling the opening of the electronic expansion valve to make the evaporating temperature greater than the dew point temperature of the return air comprises:
acquiring the return air dew point temperature, and monitoring the evaporation temperature;
if the evaporation temperature is less than or equal to the return air dew point temperature, the opening degree of each electronic expansion valve is increased one by one until the evaporation temperature is greater than the return air dew point temperature;
and if the opening degree of the current electronic expansion valve is maximum but the evaporation temperature is still less than or equal to the return air dew point temperature, continuing to increase the next electronic expansion valve.
Optionally, after controlling the opening of the electronic expansion valve to make the evaporating temperature greater than the dew point temperature of the return air, the method further comprises:
monitoring the degree of superheat of the suction gas;
if the suction superheat degree is less than or equal to a third preset temperature, reducing the opening degree of each electronic expansion valve one by one until a preset condition is met;
if the opening of the current electronic expansion valve is minimum and still does not meet the preset condition, continuing to close the next electronic expansion valve; the preset condition includes any one of: the suction superheat degree is higher than the third preset temperature, and the evaporation temperature is lower than (return air dew point temperature +1) DEG C.
Optionally, before controlling the opening of the electronic expansion valve to make the evaporating temperature greater than the dew point temperature of the return air, the method further comprises:
controlling the evaporation temperature to be maintained at the second preset temperature for a preset time period;
judging whether the actual temperature drop value is smaller than a preset threshold value within the preset time length;
if yes, the opening degree of the electronic expansion valve is controlled so that the evaporation temperature is higher than the return air dew point temperature.
An embodiment of the present invention further provides a refrigeration control apparatus, including:
the monitoring module is used for monitoring the actual temperature of the target space;
the first control module is used for controlling the refrigeration equipment to enter a rapid cooling mode when the actual temperature is higher than a first preset temperature, and controlling the opening degree of the electronic expansion valve in the rapid cooling process so as to maintain the evaporation temperature at a second preset temperature;
and the second control module is used for controlling the opening of the electronic expansion valve to enable the evaporation temperature to be greater than the return air dew point temperature when the actual temperature is less than or equal to the first preset temperature.
An embodiment of the present invention further provides a refrigeration apparatus, including: the refrigeration control device provided by the embodiment of the invention.
Optionally, the refrigeration equipment includes an evaporator and a condenser, and at least two electronic expansion valves are connected in parallel between the evaporator and the condenser.
Optionally, the refrigeration equipment includes a gas-liquid separator, and the capacity of the gas-liquid separator may accommodate all liquid refrigerants in the refrigeration equipment.
Optionally, the refrigeration equipment is a refrigerator, an air conditioner or a refrigeration house unit.
Embodiments of the present invention also provide a computer-readable storage medium on which a computer program is stored, where the computer program, when executed by a processor, implements a refrigeration control method according to an embodiment of the present invention.
By applying the technical scheme of the invention, the actual temperature of the target space is monitored, when the actual temperature is higher than the first preset temperature, the refrigeration equipment is controlled to enter a rapid cooling mode, and the opening degree of the electronic expansion valve is controlled in the rapid cooling process so as to maintain the evaporation temperature at the second preset temperature; and when the actual temperature is less than or equal to the first preset temperature, controlling the opening of the electronic expansion valve to enable the evaporation temperature to be greater than the return air dew point temperature. Carry out the rapid cooling refrigeration and guarantee that evaporating temperature maintains the second temperature of predetermineeing that can not frosting under high temperature operating mode, control evaporating temperature and be greater than return air dew point temperature under low temperature operating mode, be difficult for frosting, rapid cooling refrigeration can reduce dew point temperature simultaneously, make it is greater than return air dew point temperature to change to satisfy evaporating temperature under the low temperature operating mode, can effectively reduce the evaporimeter and frosting at the refrigeration in-process from this, prolong high-efficient refrigerated time, avoid frequently changing the frost and lead to the performance loss, efficiency and reliability are improved.
Drawings
Fig. 1 is a flowchart of a refrigeration control method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a refrigeration unit provided in accordance with an embodiment of the present invention;
fig. 3 is a specific flowchart of a refrigeration control method according to a second embodiment of the present invention;
fig. 4 is a block diagram of a refrigeration control apparatus according to a third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
The embodiment provides a refrigeration control method, which can effectively reduce frosting of refrigeration equipment and improve refrigeration energy efficiency and reliability.
Fig. 1 is a flowchart of a refrigeration control method according to an embodiment of the present invention, and as shown in fig. 1, the method includes the following steps:
s101, monitoring the actual temperature of the target space.
S102, when the actual temperature is higher than the first preset temperature, controlling the refrigeration equipment to enter a rapid cooling mode, and controlling the opening degree of the electronic expansion valve in the rapid cooling process to maintain the evaporation temperature at a second preset temperature.
And S103, controlling the opening of the electronic expansion valve to enable the evaporation temperature to be greater than the return air dew point temperature when the actual temperature is less than or equal to the first preset temperature.
The target space refers to the action range of refrigeration by the refrigeration equipment, and can be a refrigeration house, a refrigerating chamber or a freezing chamber of a refrigerator, an indoor space where an air conditioner is located, and the like. The actual temperature of the target space can be monitored in real time through the temperature sensor.
The first preset temperature is a temperature value capable of representing a difference between an actual temperature of the target space and a set target temperature, and is greater than the set target temperature, for example, the target temperature is 0 ℃ and the first preset temperature is 10 ℃. The current working condition can be judged to belong to a high-temperature working condition or a low-temperature working condition through the first preset temperature, for example, the actual temperature is higher than the first preset temperature, which indicates that the actual temperature is much higher than the target temperature and is in the high-temperature working condition, and at this moment, the actual temperature of the target space needs to be quickly reduced; the actual temperature is less than or equal to the first preset temperature, the actual temperature is not much different from the target temperature, the evaporator is in a low-temperature working condition, and the evaporator is easy to frost under the low-temperature working condition.
The second preset temperature is an evaporation temperature value which does not cause the evaporator to frost under the high-temperature working condition. The second predetermined temperature is greater than 0 ℃. For example, the value is 1 ℃. The evaporation temperature is maintained at the second preset temperature, namely is not reduced to be below 0 ℃, and frost is not formed.
The rapid cooling mode is to rapidly reduce the actual temperature of the space to about 0 ℃, and specifically, the rapid cooling can be performed by increasing the frequency of the compressor, increasing the flow rate of the refrigerant, increasing the air volume and the like. The return air dew point temperature refers to the air dew point temperature at the return air of the evaporator. In the process of rapid cooling, along with cooling and dehumidifying, the air dew point temperature can be reduced to some extent, preparation is made for the low-temperature working condition, the air dew point temperature is low, and the evaporating temperature is more easily met and is greater than the return air dew point temperature under the low-temperature working condition, so that frosting is effectively reduced, and the refrigerating process is not easy to frost.
In the refrigeration control method of the embodiment, by monitoring the actual temperature of the target space, when the actual temperature is higher than a first preset temperature, the refrigeration equipment is controlled to enter a rapid cooling mode, and the opening degree of the electronic expansion valve is controlled in the rapid cooling process so as to maintain the evaporation temperature at a second preset temperature; and when the actual temperature is less than or equal to the first preset temperature, controlling the opening of the electronic expansion valve to enable the evaporation temperature to be greater than the return air dew point temperature. Carry out the rapid cooling refrigeration and guarantee that evaporating temperature maintains the second temperature of predetermineeing that can not frosting under high temperature operating mode, control evaporating temperature and be greater than return air dew point temperature under low temperature operating mode, be difficult for frosting, rapid cooling refrigeration can reduce dew point temperature simultaneously, make it is greater than return air dew point temperature to change to satisfy evaporating temperature under the low temperature operating mode, can effectively reduce the evaporimeter and frosting at the refrigeration in-process from this, prolong high-efficient refrigerated time, avoid frequently changing the frost and lead to the performance loss, efficiency and reliability are improved.
The refrigeration equipment in the embodiment comprises an evaporator and a condenser, wherein at least two electronic expansion valves are connected in parallel between the evaporator and the condenser. At least two electronic expansion valves are arranged in parallel, so that the space for adjusting the electronic expansion valves is larger, the adjustment of the evaporation temperature is facilitated, and the guarantee is provided for reducing frosting. The number of the electronic expansion valves connected in parallel can be determined according to the configuration requirement of the refrigeration equipment so as to meet the requirement of the refrigeration equipment on the adjustment of the evaporation temperature under the maximum refrigeration capacity. In the actual use process of the refrigeration equipment, the number of the electronic expansion valves can be added or reduced according to the specific use condition.
Referring to fig. 2, the refrigerating apparatus includes: the air conditioner comprises a compressor 1, a condenser 2, a condensing fan 3, a drying filter 4, an electromagnetic valve 5, a filter 6, a first electronic expansion valve 7, a second electronic expansion valve 8, a third electronic expansion valve 9, a fourth electronic expansion valve 10, a fifth electronic expansion valve 11, an evaporating fan 12, an evaporator 13, a gas-liquid separator 14, an air suction pressure sensor 15, an air return temperature sensing bulb 16, an air return humidity sensor 17, an air supply temperature sensing bulb 18 and an air supply humidity sensor 19. The first electronic expansion valve 7, the second electronic expansion valve 8, the third electronic expansion valve 9, the fourth electronic expansion valve 10 and the fifth electronic expansion valve 11 are arranged in parallel.
In one embodiment, controlling the opening of the electronic expansion valve during rapid cool-down to maintain the evaporating temperature at a second preset temperature comprises: monitoring the evaporation temperature; if the evaporation temperature is lower than a second preset temperature, increasing the opening degree of each electronic expansion valve one by one until the evaporation temperature reaches the second preset temperature, wherein if the opening degree of the current electronic expansion valve is maximum but the evaporation temperature is still lower than the second preset temperature, continuing to increase the next electronic expansion valve; and if the evaporation temperature is higher than the second preset temperature, reducing the opening degree of each electronic expansion valve one by one until the evaporation temperature reaches the second preset temperature, wherein if the opening degree of the current electronic expansion valve is minimum and the evaporation temperature is still higher than the second preset temperature, continuing to close the next electronic expansion valve.
The low pressure can be detected by the suction pressure sensor, and the evaporation temperature can be obtained by conversion according to the low pressure. The evaporation temperature can be increased by increasing the opening degree of the electronic expansion valve, and the evaporation temperature can be decreased by decreasing the opening degree of the electronic expansion valve.
According to the embodiment, the opening degree of each electronic expansion valve is adjusted one by one according to the size relation between the evaporation temperature and the second preset temperature, so that the evaporation temperature is maintained at the second preset temperature, and refrigeration under a high-temperature working condition is guaranteed without frosting.
The order of adjustment of the electronic expansion valves is not limited, but preferably, the order of closing the electronic expansion valves is opposite to the order of opening the electronic expansion valves, so that the electronic expansion valves not opened to the maximum opening degree can be closed preferentially, which is advantageous for management and control of the electronic expansion valves. Illustratively, the sequence of opening the electronic expansion valve is 1, 2 and 3, and the sequence of closing the electronic expansion valve is 3, 2 and 1.
In the process of increasing the opening degree of the electronic expansion valve, the suction superheat degree can be reduced, and in order to avoid the influence of the too small suction superheat degree, the refrigeration equipment in the embodiment can comprise a gas-liquid separator, the capacity of the gas-liquid separator can accommodate all liquid refrigerants in the refrigeration equipment, so that the gas-liquid separator with the large capacity can effectively avoid the liquid carried in the returned gas of the compressor, and the influence of the too small suction superheat degree is eliminated.
Considering that the decreasing of the opening degree of the electronic expansion valve may affect the degree of superheat of the intake air, for example, the degree of superheat of the intake air is too large, so that the discharge temperature of the compressor may be too high, therefore, in the decreasing of the opening degree of the electronic expansion valve, the present embodiment may control in combination with the degree of superheat of the intake air to ensure a reasonable degree of superheat of the intake air, and decrease the evaporation temperature to the second preset temperature.
Specifically, reducing the opening degree of each electronic expansion valve one by one includes: monitoring the degree of superheat of suction gas in the process of reducing the opening degree of the electronic expansion valve; and if the suction superheat degree is higher than the third preset temperature but the evaporation temperature is still higher than the second preset temperature, controlling the evaporation fan to operate in a frequency reduction mode so as to maintain the evaporation temperature at the second preset temperature. The third preset temperature is an acceptable temperature of the suction superheat degree, and can be configured according to a specific unit.
If the degree of superheat of breathing in is greater than the third preset temperature but evaporation temperature still is greater than the second preset temperature, can not continue to reduce the electronic expansion valve aperture this moment again, otherwise can lead to the degree of superheat of breathing in too big, influence equipment normal operating, can consider to reduce evaporation temperature through other operations, for example, reduce the frequency of evaporation fan to make evaporation temperature drop to the second preset temperature when guaranteeing reasonable degree of superheat of breathing in, guarantee that equipment can normally refrigerate and can not frosted.
Through the steps, under the high-temperature working condition, the rapid cooling is carried out based on the large temperature difference, in the process, the heat exchange capacity of the evaporator can be fully exerted due to the large heat exchange temperature difference, meanwhile, the large temperature difference can reduce the moisture in the air, the dew point temperature is reduced, and the frosting is reduced under the subsequent low-temperature working condition.
In one embodiment, controlling the opening of the electronic expansion valve to make the evaporating temperature greater than the return air dew point temperature comprises: acquiring the dew point temperature of return air, and monitoring the evaporation temperature; if the evaporation temperature is less than or equal to the return air dew point temperature, the opening degree of each electronic expansion valve is increased one by one until the evaporation temperature is greater than the return air dew point temperature; and if the opening degree of the current electronic expansion valve is maximum and the evaporation temperature is still less than or equal to the return air dew point temperature, continuing to increase the next electronic expansion valve. If the evaporating temperature is less than or equal to the return air dew point temperature, the evaporating temperature does not need to be adjusted. The air return dew point temperature can be calculated through the temperature value detected by the air return temperature sensor at the air return opening of the evaporator and the relative humidity value detected by the air return humidity sensor.
This embodiment is through adjusting parallelly connected electronic expansion valve's aperture one by one for evaporating temperature is greater than return air dew point temperature under the low temperature operating mode, guarantees to be difficult for frosting under the low temperature operating mode.
Further, after controlling the opening of the electronic expansion valve to make the evaporation temperature greater than the return air dew point temperature, the method further comprises the following steps: monitoring the degree of superheat of the suction gas; if the suction superheat degree is less than or equal to a third preset temperature, reducing the opening degree of each electronic expansion valve one by one, and stopping the operation of closing the electronic expansion valves until preset conditions are met; if the opening of the current electronic expansion valve is minimum but still does not meet the preset condition, continuing to close the next electronic expansion valve; the preset condition includes any one of: the degree of superheat of the air suction is higher than a third preset temperature, and the evaporation temperature is lower than (the dew point temperature of the return air plus 1) DEG C.
Under the condition that evaporating temperature is greater than return air dew point temperature, if the degree of superheat of breathing in is big enough, then need close electronic expansion valve, increase the heat transfer difference in temperature of evaporimeter to improve the refrigerating output, guarantee that actual temperature can reach the target temperature, and at this in-process, need pay attention to guarantee that evaporating temperature can not be less than return air dew point temperature, avoid frosting.
Before controlling the opening of the electronic expansion valve to enable the evaporation temperature to be larger than the dew point temperature of the return air, the method further comprises the following steps: controlling the evaporation temperature to be maintained at a second preset temperature and operating for a preset time; judging whether the actual temperature drop value is smaller than a preset threshold value within a preset time length; if yes, the opening degree of the electronic expansion valve is controlled so that the evaporation temperature is higher than the return air dew point temperature. The preset time period can be set according to the refrigeration requirement, for example, set to 30 minutes. Under the low-temperature working condition, the actual temperature is closer to the target temperature, the evaporation temperature is maintained at a second preset temperature according to the control of the electronic expansion valve under the high-temperature working condition, and the state is maintained for a preset time. Within a preset time, if the actual temperature drop value is smaller than a preset threshold value, the currently maintained refrigerating capacity is not enough to lower the actual temperature, the refrigerating capacity needs to be increased to further lower the temperature, and before the refrigerating capacity is increased, the evaporating temperature needs to be ensured to be larger than the dew point temperature of return air. And if the actual temperature drop value is greater than or equal to the preset threshold value within the preset time length, the currently maintained refrigerating capacity is represented to be enough to lower the actual temperature, and at the moment, the opening degree of the electronic expansion valve can be continuously adjusted to maintain the evaporation temperature at the second preset temperature for refrigerating.
Example two
The refrigeration control method is described below with reference to a specific embodiment, however, it should be noted that the specific embodiment is only for better describing the present application and is not to be construed as limiting the present application. The same or corresponding terms as those of the above-described embodiments are explained, and the description of the present embodiment is omitted.
With reference to fig. 3 and the refrigeration equipment shown in fig. 2, taking a refrigeration storage unit as an example, the refrigeration control method for reducing frosting includes the following steps:
and S301, starting cooling.
S302, judging whether the warehouse temperature is larger than Tk-max (namely the first preset temperature), if so, entering the step S303, and if not, entering the step S309.
And S303, controlling the refrigeration house unit to enter a large temperature difference temperature-raising state.
S304, determine whether the evaporation temperature is greater than To (i.e. the second predetermined temperature), if yes, go To step S305, otherwise, go To step S308.
S305, the electronic expansion valve is closed, and if the suction superheat degree is larger than 5 ℃ (namely the third preset temperature), the frequency of the evaporation fan is reduced, so that the evaporation temperature is maintained at To.
And S306, maintaining the evaporation temperature To for refrigeration.
S307, the temperature of the reservoir is decreased, the step S302 is returned, and the size of the reservoir temperature and the size of Tk-max are continuously judged.
S308, the electronic expansion valve is opened large To maintain the evaporation temperature To, and the process advances To step S306.
S309, the opening degree of the electronic expansion valve is adjusted, the evaporation temperature is maintained at the temperature To be operated for 30min, if the temperature of the storage is continuously detected within the 30min, the temperature of the storage is reduced by less than 0.5 ℃, the maintained refrigerating capacity is not enough To reduce the temperature of the storage, the refrigerating capacity needs To be increased To reduce the temperature of the storage, but before the refrigerating capacity is increased, the evaporation temperature needs To be higher than the dew point temperature To avoid frosting. And calculating the dew point temperature of the return air.
And S310, judging whether the evaporation temperature is greater than the return air dew point temperature, if so, going to S311, and if not, going to S312.
And S311, determining that the evaporation temperature is greater than the return air dew point temperature.
In step S312, the electronic expansion valve is opened to increase the evaporation temperature to be higher than the return air dew point temperature, and the process proceeds to step S311.
And S313, under the condition that the evaporation temperature is higher than the return air dew point temperature, continuously refrigerating to enable the storage temperature to reach the target temperature.
And S314, ending.
When the temperature in the cold storage is higher than Tk-max (namely a high-temperature working condition), the temperature of the cold storage is reduced to be near 0 ℃, and the unit enters a large-temperature-difference rapid temperature-raising state. And converting the evaporation temperature according to the low-pressure sensed by the air suction pressure sensor. In the quick temperature-pulling process of the unit, the evaporation temperature needs To be kept To be To ℃. By detecting the suction pressure, the evaporation temperature can be converted.
When the evaporation temperature is lower than To ℃, the opening degree of the electronic expansion valve needs To be increased To increase the evaporation temperature. Specifically, the number of opening steps of the first electronic expansion valve 7 is increased, and when the number of steps of the first electronic expansion valve 7 is increased to the maximum but the evaporation temperature cannot be increased, the second electronic expansion valve 8 is opened, and so on until all the electronic expansion valves are opened to the maximum.
When the evaporation temperature is higher than To deg.c, the electronic expansion valve needs To be closed To lower the evaporation temperature, specifically, the fifth electronic expansion valve 11 closes To the first electronic expansion valve 7, which is the reverse order of opening the electronic expansion valve. If the suction superheat degree is larger than 5 ℃ and the evaporation temperature is still not reduced in the opening process of the electronic expansion valve, controlling the evaporation fan To operate in a frequency reduction mode To reduce the evaporation temperature and ensure that the evaporation temperature of the unit is at To ℃.
Tk-max may take a value of 10 ℃ and To may take a value of 1 ℃.
In the process of rapid temperature reduction with large temperature difference, because the evaporation temperature is maintained at To and higher than 0 ℃, the evaporator can not frost. Because the heat exchange temperature difference is big, so can full play the heat transfer ability of evaporimeter, great difference in temperature can reduce the still moisture of air simultaneously, reduces dew point temperature for satisfy evaporation temperature more easily under the low temperature operating mode and be greater than dew point temperature, in order to reduce the frosting.
When the temperature in the cold storage is less than or equal To Tk-max (namely, the low-temperature working condition), the storage temperature is closer To the target storage temperature, and the unit firstly operates for 30min by keeping the evaporation temperature at To ℃ according To the control logic. If the temperature of the storage is reduced to be less than 0.5 ℃ within the 30min of continuous detection, the refrigerating capacity maintained at the moment is not enough to meet the requirement of reducing the temperature of the storage, and the refrigerating capacity needs to be increased to reduce the temperature of the storage. However, before the cooling capacity is increased, the evaporating temperature needs to be higher than the dew point temperature to avoid frosting, so that if the evaporating temperature is lower than or equal to the dew point temperature, the evaporating temperature is increased by opening the electronic expansion valve. Under the condition that the suction superheat degree is not more than 5 ℃, the heat exchange temperature difference can be continuously increased, specifically, the opening degree of the fifth electronic expansion valve 11 is reduced until the fifth electronic expansion valve is closed, and then the fourth electronic expansion valve 10 is reduced until the first electronic expansion valve 7 is closed. Stopping shutting down the electronic expansion valve as long as any one of the following conditions is met: (1) the degree of superheat is more than 5 ℃; (2) the evaporation temperature is lower than (return air dew point temperature +1) DEG C.
To refrigeration plant draw warm slowly at high temperature operating mode, frosting serious problem at low temperature operating mode, this embodiment is through monitoring evaporating temperature and control electronic expansion valve for refrigeration plant utilizes the quick refrigeration cooling of big difference in temperature at high temperature operating mode, reduces the heat transfer difference in temperature at low temperature operating mode, thereby makes the refrigeration process can quick cooling and be difficult for frosting, prolongs high-efficient refrigerated time, avoids the efficiency loss that frequent defrosting brought, improves efficiency and reliability.
EXAMPLE III
Based on the same inventive concept, the present embodiment provides a refrigeration control apparatus, which can be used to implement the refrigeration control method described in the above embodiments. The device may be implemented by software and/or hardware, and may be generally integrated into a controller of a refrigeration appliance.
Fig. 4 is a block diagram of a refrigeration control apparatus according to a third embodiment of the present invention, and as shown in fig. 4, the apparatus includes:
a monitoring module 41 for monitoring the actual temperature of the target space;
the first control module 42 is configured to control the refrigeration equipment to enter a fast cooling mode when the actual temperature is higher than a first preset temperature, and control the opening of the electronic expansion valve during the fast cooling process to maintain the evaporation temperature at a second preset temperature;
and the second control module 43 is used for controlling the opening of the electronic expansion valve to enable the evaporation temperature to be greater than the return air dew point temperature when the actual temperature is less than or equal to the first preset temperature.
The refrigeration equipment comprises an evaporator and a condenser, wherein at least two electronic expansion valves are connected in parallel between the evaporator and the condenser.
The first control module 42 includes:
a first monitoring unit for monitoring the evaporation temperature;
the first control unit is used for increasing the opening degree of each electronic expansion valve one by one until the evaporation temperature reaches the second preset temperature if the evaporation temperature is lower than the second preset temperature, wherein if the opening degree of the current electronic expansion valve is maximum but the evaporation temperature is still lower than the second preset temperature, the next electronic expansion valve is continuously increased;
and the second control unit is used for reducing the opening degree of each electronic expansion valve one by one until the evaporation temperature reaches the second preset temperature if the evaporation temperature is higher than the second preset temperature, wherein if the opening degree of the current electronic expansion valve is minimum but the evaporation temperature is still higher than the second preset temperature, the next electronic expansion valve is continuously closed.
Optionally, the second control unit is specifically configured to: monitoring the degree of superheat of suction gas in the process of reducing the opening degree of the electronic expansion valve; and if the suction superheat degree is higher than a third preset temperature but the evaporation temperature is still higher than the second preset temperature, controlling the evaporation fan to perform frequency reduction operation so as to maintain the evaporation temperature at the second preset temperature.
Optionally, the second control module 43 includes:
the acquisition unit is used for acquiring the return air dew point temperature and monitoring the evaporation temperature;
the third control unit is used for increasing the opening degree of each electronic expansion valve one by one until the evaporation temperature is greater than the return air dew point temperature if the evaporation temperature is less than or equal to the return air dew point temperature; and if the opening degree of the current electronic expansion valve is maximum but the evaporation temperature is still less than or equal to the return air dew point temperature, continuing to increase the next electronic expansion valve.
Optionally, the second control module 43 further includes:
the second monitoring unit is used for monitoring the suction superheat degree after controlling the opening degree of the electronic expansion valve to enable the evaporation temperature to be larger than the return air dew point temperature;
the fourth control unit is used for reducing the opening degree of each electronic expansion valve one by one until a preset condition is met if the suction superheat degree is less than or equal to a third preset temperature; if the opening of the current electronic expansion valve is minimum and still does not meet the preset condition, continuing to close the next electronic expansion valve; the preset condition includes any one of: the suction superheat degree is higher than the third preset temperature, and the evaporation temperature is lower than (return air dew point temperature +1) DEG C.
Optionally, the second control module 43 further includes:
the fifth control unit is used for controlling the evaporation temperature to be maintained at the second preset temperature and operating for a preset time; judging whether the actual temperature drop value is smaller than a preset threshold value within the preset time length; and if the actual temperature drop value in the preset time length is smaller than the preset threshold value, controlling the opening of the electronic expansion valve to enable the evaporation temperature to be larger than the return air dew point temperature.
The device can execute the method provided by the embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the method provided by the embodiment of the present invention.
Example four
The present embodiment provides a refrigeration apparatus including: the refrigeration control device according to the above embodiment. This refrigeration plant carries out rapid cooling refrigeration and guarantees that evaporating temperature maintains the second that can not frost under the high temperature operating mode and predetermines the temperature, control evaporating temperature is greater than return air dew point temperature under the low temperature operating mode, be difficult for frosting, rapid cooling refrigeration can reduce dew point temperature simultaneously, make to change to satisfy evaporating temperature under the low temperature operating mode and be greater than return air dew point temperature, can effectively reduce the evaporimeter and frosted at the refrigeration in-process from this, prolong high-efficient refrigerated time, avoid frequent frost to lead to the loss of performance, efficiency and reliability are improved.
The refrigeration equipment comprises an evaporator and a condenser, wherein at least two electronic expansion valves are connected in parallel between the evaporator and the condenser. At least two electronic expansion valves are arranged in parallel, so that the space for adjusting the electronic expansion valves is larger, the adjustment of the evaporation temperature is facilitated, and the guarantee is provided for reducing frosting.
The refrigerating equipment comprises a gas-liquid separator, and the capacity of the gas-liquid separator can accommodate all liquid refrigerants in the refrigerating equipment so as to ensure that the compressor operates without liquid.
Preferably, the refrigeration equipment can be a refrigerator, an air conditioner or a refrigeration house unit and the like.
EXAMPLE five
The present embodiment provides a computer-readable storage medium on which a computer program is stored, which when executed by a processor, implements the refrigeration control method as described in the above embodiments.
EXAMPLE six
The present embodiment provides an electronic device, including: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to implement the refrigeration control method according to the above embodiment.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer-executable instructions and that, although a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order different than presented herein.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (13)
1. A refrigeration control method, characterized by comprising:
monitoring an actual temperature of the target space;
when the actual temperature is higher than a first preset temperature, controlling the refrigeration equipment to enter a rapid cooling mode, and controlling the opening degree of the electronic expansion valve in the rapid cooling process to maintain the evaporation temperature at a second preset temperature;
and when the actual temperature is less than or equal to the first preset temperature, controlling the opening of the electronic expansion valve to enable the evaporation temperature to be greater than the return air dew point temperature.
2. The method of claim 1, wherein the refrigeration appliance comprises an evaporator and a condenser, and wherein at least two electronic expansion valves are connected in parallel between the evaporator and the condenser.
3. The method of claim 2, wherein controlling the opening of the electronic expansion valve to maintain the evaporating temperature at the second preset temperature during the rapid cool-down comprises:
monitoring the evaporation temperature;
if the evaporation temperature is lower than the second preset temperature, increasing the opening degree of each electronic expansion valve one by one until the evaporation temperature reaches the second preset temperature, wherein if the opening degree of the current electronic expansion valve is maximum but the evaporation temperature is still lower than the second preset temperature, continuing to increase the next electronic expansion valve;
if the evaporation temperature is higher than the second preset temperature, the opening degree of each electronic expansion valve is reduced one by one until the evaporation temperature reaches the second preset temperature, wherein if the opening degree of the current electronic expansion valve is minimum but the evaporation temperature is still higher than the second preset temperature, the next electronic expansion valve is continuously closed.
4. The method of claim 3, wherein reducing the opening degree of each electronic expansion valve individually comprises:
monitoring the degree of superheat of suction gas in the process of reducing the opening degree of the electronic expansion valve;
and if the suction superheat degree is higher than a third preset temperature but the evaporation temperature is still higher than the second preset temperature, controlling the evaporation fan to perform frequency reduction operation so as to maintain the evaporation temperature at the second preset temperature.
5. The method of claim 2, wherein controlling the electronic expansion valve opening to achieve an evaporating temperature greater than the return air dew point temperature comprises:
acquiring the return air dew point temperature, and monitoring the evaporation temperature;
if the evaporation temperature is less than or equal to the return air dew point temperature, the opening degree of each electronic expansion valve is increased one by one until the evaporation temperature is greater than the return air dew point temperature;
and if the opening degree of the current electronic expansion valve is maximum but the evaporation temperature is still less than or equal to the return air dew point temperature, continuing to increase the next electronic expansion valve.
6. The method of claim 5, after controlling the electronic expansion valve opening to cause the evaporating temperature to be greater than the return air dew point temperature, further comprising:
monitoring the degree of superheat of the suction gas;
if the suction superheat degree is less than or equal to a third preset temperature, reducing the opening degree of each electronic expansion valve one by one until a preset condition is met;
if the opening of the current electronic expansion valve is minimum and still does not meet the preset condition, continuing to close the next electronic expansion valve; the preset condition includes any one of: the suction superheat degree is higher than the third preset temperature, and the evaporation temperature is lower than (return air dew point temperature +1) DEG C.
7. The method of claim 1, further comprising, prior to controlling the electronic expansion valve opening to cause the evaporating temperature to be greater than the return air dew point temperature:
controlling the evaporation temperature to be maintained at the second preset temperature for a preset time period;
judging whether the actual temperature drop value is smaller than a preset threshold value within the preset time length;
if yes, the opening degree of the electronic expansion valve is controlled so that the evaporation temperature is higher than the return air dew point temperature.
8. A refrigeration control apparatus, comprising:
the monitoring module is used for monitoring the actual temperature of the target space;
the first control module is used for controlling the refrigeration equipment to enter a rapid cooling mode when the actual temperature is higher than a first preset temperature, and controlling the opening degree of the electronic expansion valve in the rapid cooling process so as to maintain the evaporation temperature at a second preset temperature;
and the second control module is used for controlling the opening of the electronic expansion valve to enable the evaporation temperature to be greater than the return air dew point temperature when the actual temperature is less than or equal to the first preset temperature.
9. A refrigeration apparatus, comprising: the refrigeration control device of claim 8.
10. The refrigeration apparatus as recited in claim 9 wherein said refrigeration apparatus includes an evaporator and a condenser, at least two electronic expansion valves connected in parallel between said evaporator and said condenser.
11. The refrigeration appliance of claim 9, wherein the refrigeration appliance includes a gas-liquid separator having a volume to hold all of the liquid refrigerant in the refrigeration appliance.
12. A cold appliance according to any of claims 9-11, wherein the cold appliance is a refrigerator, an air conditioner or a freezer unit.
13. A computer-readable storage medium on which a computer program is stored, wherein the program, when executed by a processor, implements a refrigeration control method according to any one of claims 1 to 7.
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