CN112781286B - Defrosting control method and device and air-cooled module unit - Google Patents
Defrosting control method and device and air-cooled module unit Download PDFInfo
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- CN112781286B CN112781286B CN202010304086.2A CN202010304086A CN112781286B CN 112781286 B CN112781286 B CN 112781286B CN 202010304086 A CN202010304086 A CN 202010304086A CN 112781286 B CN112781286 B CN 112781286B
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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
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2104—Temperatures of an indoor room or compartment
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2117—Temperatures of an evaporator
Abstract
The invention belongs to the technical field of air conditioning equipment, and particularly relates to a defrosting control method and device and an air cooling module unit. The invention aims to solve the problem of unreasonable defrosting starting control in the prior art. The defrosting control method comprises the steps of obtaining the evaporator temperature and the ambient temperature of a first air cooling system; determining a temperature difference threshold corresponding to the environment temperature according to a preset first corresponding relation, wherein the first corresponding relation comprises a plurality of environment temperature intervals and temperature difference thresholds corresponding to the environment temperature intervals; and if the temperature difference between the ambient temperature and the evaporator temperature meets the temperature difference threshold value, controlling the first air cooling system to start defrosting operation. The invention takes the environment temperature into consideration, and sets different temperature difference thresholds aiming at different environment temperature intervals, so that the defrosting control can realize dynamic adaptation to the environment temperature, and the rationality of the defrosting control is greatly improved.
Description
Technical Field
The invention relates to the technical field of air conditioning equipment, in particular to a defrosting control method and equipment and an air cooling module unit.
Background
The air cooling module unit is an integrated central air conditioning device which is based on a modular technology, takes air as a cold (heat) medium and serves as a cold (heat) source. The air cooling module unit has the advantages of refrigerating in summer, heating by using outdoor air as a low-level heat source, saving energy, no need of installing a cooling tower and the like, so that the air cooling module unit is widely applied. The air-cooled modular unit is not only applied to the south of the Yangtze river, but also pushed to the north, but the air temperature in the north is generally low in winter, so that the problem that an evaporator is frosted easily occurs when the air-cooled modular unit is used for heating in winter.
In the prior art, the temperature sensor is arranged on the fin of the evaporator, and when the acquired temperature information is lower than the threshold temperature, the air cooling module unit is controlled to start defrosting operation.
However, the conventional defrosting start control is not reasonable, and the condition that frost is not removed or frost-free defrosting is often generated.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the problem in the prior art that the defrost start control is not reasonable.
In a first aspect, the present invention provides a defrost control method, comprising: acquiring the evaporator temperature and the ambient temperature of a first air cooling system;
determining a temperature difference threshold corresponding to the environment temperature according to a preset first corresponding relation, wherein the first corresponding relation comprises a plurality of environment temperature intervals and corresponding temperature difference thresholds;
and if the temperature difference between the ambient temperature and the evaporator temperature meets the temperature difference threshold value, controlling the first air cooling system to start defrosting operation.
In one possible design, the method further includes:
and if the temperature of the evaporator meets a set defrosting temperature threshold value, controlling the first air cooling system to start defrosting operation.
In one possible design, the method further includes:
if the environment temperature is less than or equal to a first preset temperature, calculating the defrosting temperature threshold according to the product of a first coefficient and the environment temperature; alternatively, the first and second liquid crystal display panels may be,
and if the environment temperature is higher than a second preset temperature, calculating the defrosting temperature threshold according to the product of a second coefficient and the environment temperature, wherein the first preset temperature is lower than the second preset temperature, and the first coefficient is higher than the second coefficient.
In one possible design, the method further includes:
acquiring last defrosting time of the first air cooling system;
and correcting the defrosting temperature threshold according to the last defrosting time.
In a possible design, the modifying the defrost temperature threshold based on the last defrost time includes:
if the last defrosting time is shorter than a first preset time, reducing the defrosting temperature threshold by a first value; alternatively, the first and second liquid crystal display panels may be,
and if the last defrosting time is longer than a second preset time, increasing the defrosting temperature threshold by a second numerical value, wherein the first preset time is shorter than the second preset time, and the first numerical value and the second numerical value are positive numbers.
In one possible design, the method further includes:
determining a defrosting interval threshold value of the current defrosting according to the last defrosting time and the last defrosting interval time;
and if the last defrosting time of the current time distance meets the defrosting interval threshold, controlling the first air cooling system to start defrosting operation.
In one possible design, the method further includes:
if the state of the second air-cooling system meets the preset condition, controlling the second air-cooling system to start defrosting operation; the second air cooling system and the first air cooling system belong to the same air cooling module unit and share an air duct; the status includes at least one of: running state, running duration, evaporator temperature and outlet pipe temperature.
In a second aspect, the present invention provides a defrost control apparatus comprising:
the acquisition module is used for acquiring the evaporator temperature and the ambient temperature of the first air cooling system;
the determining module is used for determining a temperature difference threshold corresponding to the environment temperature according to a preset first corresponding relation, wherein the first corresponding relation comprises a plurality of environment temperature intervals and corresponding temperature difference thresholds;
and the first control module is used for controlling the first air cooling system to start defrosting operation if the temperature difference between the ambient temperature and the evaporator temperature meets the temperature difference threshold value.
In a third aspect, the present invention provides a defrosting control apparatus comprising: at least one processor and memory;
the memory stores computer execution instructions;
the at least one processor executes computer-executable instructions stored by the memory to cause the at least one processor to perform the method as set forth in the first aspect above and in various possible designs of the first aspect.
In a fourth aspect, the present invention provides an air-cooled modular unit, comprising: at least one first air cooling system and the defrost control apparatus of the third aspect above;
the defrosting control device is connected to the first air cooling system, and is configured to perform defrosting control on the first air cooling system by performing the defrosting control method according to the first aspect and various other possible designs except for the last possible design.
In one possible design, the air-cooled modular unit further comprises at least one second air-cooled system;
the defrosting control device is connected to the second air-cooling system, and is further configured to execute the defrosting control method according to the last possible design of the first aspect, so as to perform defrosting control on the second air-cooling system.
In a fifth aspect, the present invention provides a computer-readable storage medium having stored thereon computer-executable instructions that, when executed by a processor, implement a method as set forth above in the first aspect and various possible designs of the first aspect.
The defrosting control method and the defrosting control equipment and the air cooling module set provided by the invention can be understood by a person skilled in the art, and the method comprises the steps of obtaining the temperature of an evaporator of a first air cooling system and the ambient temperature; determining a temperature difference threshold corresponding to the environment temperature according to a preset first corresponding relation, wherein the first corresponding relation comprises a plurality of environment temperature intervals and temperature difference thresholds corresponding to the environment temperature intervals; and when the temperature difference between the ambient temperature and the evaporator temperature meets the temperature difference threshold value, controlling the first air cooling system to start defrosting operation. Through also acquiring the ambient temperature of the environment that first air-cooled system is located when acquireing the evaporimeter temperature, and through monitoring the difference in temperature between ambient temperature and the evaporimeter temperature, when this difference in temperature satisfies the difference in temperature threshold value that this ambient temperature corresponds, control first air-cooled system and start defrosting operation, can take into account ambient temperature, and set for different difference in temperature thresholds to different ambient temperature intervals, make defrosting control can realize dynamic adaptation to ambient temperature, the rationality of defrosting control has been improved greatly.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the following briefly introduces the drawings needed to be used in the description of the embodiments or the prior art, and obviously, the drawings in the following description are some embodiments of the present invention, and those skilled in the art can obtain other drawings according to the drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a system of an air-cooled modular unit according to an embodiment of the present invention;
FIG. 2 is a flow chart of a defrost control method according to an embodiment of the present invention;
FIG. 3 is a flow chart of a defrost control method according to yet another embodiment of the present invention;
FIG. 4 is a flow chart illustrating a defrosting control method according to another embodiment of the present invention;
FIG. 5 is a flow chart of a defrost control method according to yet another embodiment of the present invention;
FIG. 6 is a schematic diagram of a defrosting control device according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a defrosting control device according to another embodiment of the present invention;
fig. 8 is a schematic diagram of a hardware structure of a defrosting control device according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a hardware structure of an air cooling module unit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. 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.
Fig. 1 is a schematic structural diagram of a system of an air-cooled modular unit according to an embodiment of the present invention. As shown in fig. 1, the air-cooled module unit 80 includes: the air cooling system comprises a controller 101 and a first air cooling system 102, wherein the first air cooling system 102 can comprise a compressor, a four-way reversing valve, a water-side heat exchanger, an expansion valve and a wind-side heat exchanger; the controller 101 is connected to a temperature sensor 1021 of an air-side heat exchanger of the first air-cooling system 102, and is configured to receive a fin temperature of the air-side heat exchanger sent by the temperature sensor 1021, generate a defrosting control signal according to the fin temperature, and send the defrosting control signal to the first air-cooling system 102, where the first air-cooling system 102 is configured to enter a defrosting mode according to the defrosting control signal. Optionally, the air-cooling module assembly 80 may further include a second air-cooling system 103, and the second air-cooling system 103 may have the same structure as the first air-cooling system. The first air-cooling system 102 and the second air-cooling system 103 may be two independent systems, or may be a common air duct system. This embodiment does not limit this.
When the air-cooled modular unit 80 is in the heating mode, in the first air-cooled system 102, high-temperature and high-pressure gas discharged from the compressor enters the water-side heat exchanger (cold-hot water condenser) through the four-way reversing valve, the condensed high-temperature and high-pressure liquid enters the liquid reservoir through the one-way valve, and enters the air-side heat exchanger (fin evaporator) for evaporation after being throttled by the drying filter and the expansion valve, and the evaporated gas-liquid mixture is separated by the gas-liquid separator, and then the gas returns to the air suction end of the compressor, so that the whole compression process is completed. In the process, the wind-side heat exchanger evaporates and absorbs heat, the temperature of the fins is relatively low, the temperature sensor 1021 arranged in the fins sends the sensed temperature of the fins to the controller 101, the controller 101 compares the temperature of the fins with a preset temperature threshold, and if the temperature of the fins is lower than the preset threshold, the first air cooling system 102 is controlled to enter a defrosting mode.
It can be seen that the reasonableness of the setting of the preset temperature threshold value in the process is closely related to the reasonableness of controlling the air cooling system to enter the defrosting mode. However, in the prior art, the preset temperature threshold is usually set to a fixed value, so that the judgment of the defrosting timing is inaccurate, and the situations of defrosting without frost and defrosting without frost often occur. Based on this, the embodiment of the invention provides a defrosting control method to improve the rationality and accuracy of defrosting control.
In the present embodiment, the ambient temperature is taken as a factor of entering into defrosting in consideration of the difference in the influence of the difference in the ambient temperature on frosting. The present embodiment sets the threshold value of the temperature difference between the fin temperature and the ambient temperature in a subsection manner. In the embodiment, the difference value between the temperature of the fins and the ambient temperature is compared with different temperature thresholds, and the air cooling system is subjected to defrosting control according to the comparison result, so that the rationality and the accuracy of the defrosting control are improved.
The technical means of the present invention will be described in detail with reference to specific examples. These several specific embodiments may be combined with each other below, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 2 is a flowchart illustrating a defrosting control method according to an embodiment of the present invention.
As shown in fig. 2, the method includes:
201. the evaporator temperature and the ambient temperature of the first air-cooling system are acquired.
The execution main body of the present embodiment may be the controller 101 of the air-cooling module unit shown in fig. 1, or may be a controller inside the first air-cooling system.
In this embodiment, the evaporator temperature is the temperature of the wind-side heat exchanger in the first air-cooling system, and taking the evaporator as a fin evaporator as an example, the fin temperature sensor may be disposed on a fin of the evaporator, for example, the sensor probe may be attached to a copper tube of the fin. The ambient temperature is the ambient temperature of the environment that first air-cooled system is located, can set up temperature sensor in the periphery of first air-cooled system, and is specific, for example, can set up ambient temperature sensor on the panel beating on air-cooled module machine surface.
In practical application, the fin temperature sensor collects the temperature of the evaporator and sends the temperature of the evaporator to the controller, and the environment temperature sensor collects the environment temperature and sends the environment temperature to the controller.
202. And determining a temperature difference threshold value corresponding to the environment temperature according to a preset first corresponding relation, wherein the first corresponding relation comprises a plurality of environment temperature intervals and the temperature difference threshold values corresponding to the environment temperature intervals.
It can be understood that, under different ambient temperatures, the probability of frosting of the evaporator is different, and the lower the ambient temperature is, the easier the frosting is, and based on this, the corresponding relation between a plurality of ambient temperature intervals and a plurality of temperature difference threshold values is established in the embodiment. Alternatively, the corresponding relationship may be stored in a data table, and the data table may be accessed when the controller executes the step.
For example, as shown in table 1 below, an ambient temperature range with an ambient temperature of less than-25 ℃ may correspond to the temperature threshold N, where N is a positive number and is expressed in degrees celsius, an ambient temperature range with an ambient temperature of greater than or equal to-25 ℃ and less than or equal to-20 ℃ may correspond to N +1, an ambient temperature range with an ambient temperature of greater than or equal to-20 ℃ and less than or equal to-15 ℃ may correspond to N +3, an ambient temperature range with an ambient temperature of greater than or equal to-15 ℃ and less than or equal to-10 ℃ may correspond to N +6, an ambient temperature range with an ambient temperature of greater than or equal to-10 ℃ and less than or equal to-5 ℃ may correspond to N +7, and an ambient temperature range with an ambient temperature of greater than-5 ℃ may correspond to N +8. Optionally, the value of N may be 2.
| Ambient temperature interval (Unit:. Degree. C.) | Temperature difference threshold (Unit:. Degree. C.) |
| ＜-25 | N |
| [-25,-20] | N+1 |
| [-20,-15] | N+3 |
| [-15,-10] | N+6 |
| [-10,-5] | N+7 |
| ＞-5 | N+8 |
In practical application, after acquiring the environment temperature, the controller firstly detects an environment interval corresponding to the environment temperature, and calls a temperature difference threshold corresponding to the environment interval as a temperature difference threshold of the current environment temperature.
203. And if the temperature difference between the ambient temperature and the temperature of the evaporator meets the temperature difference threshold value, controlling the first air cooling system to start defrosting operation.
In this embodiment, if the temperature difference obtained by subtracting the evaporator temperature from the ambient temperature is greater than or equal to the temperature difference threshold corresponding to the interval where the ambient temperature is located, the first air-cooling system is controlled to start the defrosting operation.
That is, controlling the first air-cooling system to start the defrosting operation requires satisfying the following inequality:
Ta-Tc≥Td (1)
wherein, ta is the ambient temperature, tc is the evaporator temperature, and Td is the temperature difference threshold corresponding to the current ambient temperature.
It is to be noted that, in order to improve the rationality of the defrosting start control, a plurality of judgment conditions may be set for controlling the first air-cooling system to start the defrosting operation. The different combinations of the determination conditions may correspond to a plurality of specific control modes, for example, in one implementation, in order to control the defrosting start more strictly, the first air-cooling system is controlled to start the defrosting operation when the conditions are met simultaneously, and formula (1) is met as a necessary condition for starting the defrosting operation; in another implementation manner, in order to improve protection of the first air-cooling system, the plurality of determination conditions may be set in parallel, and defrosting may be performed as long as one of the plurality of determination conditions is satisfied, that is, if the first air-cooling system satisfies the formula (1), a defrosting operation is immediately started, so that damage caused by frosting of the first air-cooling system can be avoided. The specific control strategy can be selected according to actual needs. This embodiment is not limited to this.
In practical application, the controller acquires the evaporator temperature acquired by the fin temperature sensor and the ambient temperature acquired by the ambient temperature sensor, and after acquiring the evaporator temperature and the ambient temperature, firstly detects an ambient interval corresponding to the ambient temperature, and calls a temperature difference threshold corresponding to the ambient interval to serve as the temperature difference threshold of the current ambient temperature. Further, the controller controls the first air-cooling system to start the defrosting operation in a case where the current ambient temperature and the evaporator temperature satisfy formula (1).
According to the defrosting control method provided by the embodiment, the ambient temperature of the environment where the first air cooling system is located is obtained while the temperature of the evaporator is obtained, the temperature difference between the ambient temperature and the temperature of the evaporator is monitored, when the temperature difference meets the temperature difference threshold value corresponding to the ambient temperature, the first air cooling system is controlled to start defrosting operation, the ambient temperature can be taken into consideration, different temperature difference threshold values are set for different ambient temperature intervals, dynamic adaptation of defrosting control to the ambient temperature can be achieved, and the rationality of defrosting control is greatly improved.
Fig. 3 is a flowchart illustrating a defrosting control method according to another embodiment of the present invention. On the basis of the above embodiment, in order to further improve the rationality of the defrosting control, in this embodiment, a threshold is set for the evaporator temperature, and as shown in fig. 3, the method includes:
301. the evaporator temperature and the ambient temperature of the first air-cooling system are acquired.
302. And determining a temperature difference threshold corresponding to the environment temperature according to a preset first corresponding relation, wherein the first corresponding relation comprises a plurality of environment temperature intervals and the temperature difference thresholds corresponding to the environment temperature intervals.
303. And if the temperature difference between the ambient temperature and the temperature of the evaporator meets the temperature difference threshold value, controlling the first air cooling system to start defrosting operation.
304. And if the temperature of the evaporator meets a set defrosting temperature threshold value, controlling the first air cooling system to start defrosting operation.
In this embodiment, if the evaporator temperature is less than or equal to the preset defrosting temperature threshold, the first air-cooling system is controlled to start the defrosting operation.
That is, controlling the first air-cooling system to start the defrosting operation requires satisfying the following inequality:
Tc≥Tth (2)
where Tc is the evaporator temperature and Tth is the set defrost temperature threshold.
As described above, the determination condition of the formula (1) corresponding to the step 303 and the determination condition of the formula (2) corresponding to the step 304 may be set to have a relationship of "or", that is, may immediately perform the defrosting operation if one of the conditions is satisfied, or may be set to have a relationship of "or", for example, if the determination conditions are the formula (1) and the formula (2), the defrosting operation may be performed when the first air-cooling system satisfies both the formula (1) and the formula (2).
In this embodiment, there are various ways to set the defrost temperature threshold.
In an implementation manner, in order to set the defrosting temperature threshold more reasonably, the influence of the ambient temperature on the defrosting temperature threshold may be taken into consideration, specifically, if the ambient temperature is less than or equal to a first preset temperature, the defrosting temperature threshold is calculated according to the product of a first coefficient and the ambient temperature; or if the environment temperature is higher than a second preset temperature, calculating the defrosting temperature threshold according to a product of a second coefficient and the environment temperature, wherein the first preset temperature is lower than the second preset temperature, and the first coefficient is higher than the second coefficient.
Alternatively, the defrost temperature threshold may be calculated according to equation (3) below,
Tth＝A*Ta+B (3)
wherein Tth is a defrosting temperature threshold, a is an adjustment coefficient, ta is an ambient temperature, and B is a preset defrosting condenser tube temperature.
A is a first coefficient if the ambient temperature Tth is less than or equal to a first predetermined temperature, and is a second coefficient if the ambient temperature Tth is greater than a second predetermined temperature.
Alternatively, the first coefficient and the second coefficient may be set according to experience or actual needs, for example, the first coefficient may be set to 0.9, and the second coefficient may be set to 0.2.
Alternatively, the first preset temperature and the second preset temperature may be set according to experience or actual needs, for example, the first preset temperature and the second preset temperature may be both set to 0 ℃.
In another implementation, the defrost temperature threshold may be corrected by a previous defrost time, taking into account the inertia of the frosting during the period of time. Specifically, the last defrosting time of the first air cooling system is obtained; and correcting the defrosting temperature threshold according to the last defrosting time. The specific correction step may include: if the last defrosting time is shorter than a first preset time, reducing the defrosting temperature threshold by a first value; or if the last defrosting time is longer than a second preset time, increasing the defrosting temperature threshold by a second value, wherein the first preset time is shorter than the second preset time, and the first value and the second value are positive numbers.
In the present embodiment, the last defrosting time refers to the time period taken for the last defrosting operation from the start to the end.
Alternatively, the first value and the second value may be set according to experience or actual needs, for example, the first value and the second value may be set to 1 ℃.
For example, if the last defrosting time is within 2-4 minutes, the defrosting temperature threshold value is kept unchanged; or, if the last defrosting time is less than 2 minutes, the defrosting temperature threshold is adjusted according to the following formula: tth = Tthp-1, where Tth is the corrected defrosting temperature threshold, tthp is the defrosting temperature threshold to be corrected, and the defrosting temperature threshold to be corrected may be the defrosting temperature threshold adopted in the last defrosting or may be the defrosting temperature threshold initially set in the current defrosting; or if the last defrosting time is more than 4 minutes, the defrosting temperature threshold is adjusted according to the following formula: tth = Tthp-1, where Tth is the corrected defrosting temperature threshold, tthp is the defrosting temperature threshold to be corrected, and the defrosting temperature threshold to be corrected may be the defrosting temperature threshold adopted in the last defrosting or may be the defrosting temperature threshold initially set in the present defrosting.
It will be appreciated that the two above-described approaches may be implemented alternatively or in combination, for example, the initial defrost temperature threshold may be obtained by the first implementation and then modified by the second implementation.
According to the defrosting control method provided by the embodiment, the defrosting temperature threshold is set for the temperature of the evaporator, so that the first air cooling system can be controlled to start defrosting operation more reasonably. Furthermore, the defrosting temperature threshold value is dynamically adjusted according to the environment temperature and/or the last defrosting time, so that a more accurate limit value of the evaporator temperature can be obtained, and the defrosting entering is reasonably controlled.
Fig. 4 is a flowchart illustrating a defrosting control method according to another embodiment of the present invention. As shown in fig. 4, in addition to the above-mentioned embodiment, for example, in addition to the embodiment shown in fig. 2, in order to more reasonably control the first air-cooling system to start the defrosting operation, in this embodiment, a determination condition of the defrosting interval is added, and specifically, the method includes:
401. the evaporator temperature and the ambient temperature of the first air-cooling system are acquired.
402. And determining a temperature difference threshold corresponding to the environment temperature according to a preset first corresponding relation, wherein the first corresponding relation comprises a plurality of environment temperature intervals and the temperature difference thresholds corresponding to the environment temperature intervals.
403. And if the temperature difference between the ambient temperature and the temperature of the evaporator meets the temperature difference threshold value, controlling the first air cooling system to start defrosting operation.
404. And determining the defrosting interval threshold value of the current defrosting according to the last defrosting time and the last defrosting interval time.
405. And if the last defrosting time of the current time distance meets the defrosting interval threshold, controlling the first air cooling system to start defrosting operation.
In the present embodiment, the last defrosting time refers to the time period taken for the last defrosting operation from the start to the end. The last defrosting interval time refers to a time period elapsed from the last defrosting operation ending time point to the last defrosting operation starting time point. For example, the defrosting time of the first defrosting operation is from 1 point to 1 point and 5 minutes, the defrosting time of the second defrosting operation is from 1 point and 15 minutes to 1 point and 22 minutes, and the defrosting interval time corresponding to the second defrosting operation is the time period from 1 point and 5 minutes to 1 point and 15 minutes, namely 10 minutes. If the defrosting time of the third defrosting operation is 1 point 35 to 1 point 38, the third defrosting operation corresponds to a defrosting time interval of the elapsed time from 1 point 22 to 1 point 35, that is, 13 minutes.
Specifically, the determination of the defrosting interval threshold for this defrosting can be divided into the following cases:
if the last defrosting time is within 2-4 minutes, the defrosting interval threshold value is kept unchanged; or if the last defrosting time is less than 2 minutes, the defrosting interval threshold is adjusted according to the following formula: tsth = Tsthp +5, where Tsth is a defrosting interval threshold of the current defrosting, and Tsthp is a last defrosting interval threshold; or, if the last defrosting time is longer than 4 minutes, the defrosting interval threshold is adjusted according to the following formula: tsth = Tsthp +5, where Tsth is the defrosting interval threshold for this defrosting, and Tsthp is the last defrosting interval threshold.
Alternatively, to avoid situations where the defrost interval is too long or too short, a maximum and minimum value may be set for the defrost interval threshold. For example, the maximum value may be set to 120 minutes and the minimum value to 30 minutes.
In practical application, after the defrosting interval threshold is adjusted, when it is detected that the time length from the current time to the last defrosting time is greater than or equal to the defrosting interval threshold, that is, when it is detected that the time length from the current time to the operation ending time is greater than or equal to the defrosting interval threshold, the first air cooling system is controlled to start defrosting operation.
That is, controlling the first air-cooling system to start the defrosting operation requires satisfying the following inequality:
Ts≥Tsth (4)
wherein Ts is a defrosting interval of the current defrosting, that is, a time length from the current time to the last defrosting time, and Tsth is a defrosting interval threshold.
As described above, the determination conditions of the formula (1) and the formula (2) in the above embodiments and the determination condition of the formula (4) in the present embodiment may be set to have a relationship of "or", that is, the defrosting operation can be immediately performed if one of the conditions is satisfied, or may be set to have a relationship of "or", for example, if the determination conditions are the formula (1) and the formula (4), the defrosting operation is performed if the first air-cooling system satisfies the formula (1) and the formula (4) at the same time.
According to the defrosting control method provided by the embodiment, the first air cooling system can be more reasonably controlled to start the defrosting operation by increasing the judgment condition of the defrosting interval threshold. Furthermore, by dynamically adjusting the defrosting interval threshold according to the last defrosting time, a more accurate defrosting interval limit value can be obtained, and therefore reasonable control over defrosting entering is achieved.
Fig. 5 is a flowchart illustrating a defrosting control method according to another embodiment of the present invention. On the basis of the above embodiments, in this embodiment, a defrosting control of the second air-cooling system sharing the air passage with the first air-cooling system when the first air-cooling system needs to start defrosting is described, as shown in fig. 5, the method includes:
501. the evaporator temperature and the ambient temperature of the first air-cooling system are acquired.
502. And determining a temperature difference threshold corresponding to the environment temperature according to a preset first corresponding relation, wherein the first corresponding relation comprises a plurality of environment temperature intervals and the temperature difference thresholds corresponding to the environment temperature intervals.
503. And if the temperature difference between the ambient temperature and the evaporator temperature meets the temperature difference threshold value, controlling the first air cooling system to start defrosting operation.
504. If the state of the second air-cooling system meets the preset condition, controlling the second air-cooling system to start defrosting operation; the second air cooling system and the first air cooling system belong to the same air cooling module unit and share an air duct; the status includes at least one of: running state, running duration, evaporator temperature and outlet pipe temperature.
In this embodiment, the temperature of the water outlet pipe is the temperature of the water-side heat exchanger in the second air-cooling system, that is, the water outlet pipe of the cold and hot water condenser, and can be obtained by arranging a water temperature sensor on the water outlet pipe of the condenser. The evaporator temperature is the temperature of the wind-side heat exchanger in the second air-cooling system, and taking the evaporator as a fin evaporator as an example, the fin temperature sensor may be arranged on a fin of the evaporator, for example, a sensor probe may be attached to a copper tube of the fin.
Optionally, under the condition that the first air-cooling system needs to start defrosting operation, if the operating state is a shutdown state, or the operating duration is less than a preset threshold, or the defrosting temperature is greater than a defrosting exit threshold, or the temperature of the water outlet pipe is less than a defrosting water outlet threshold, controlling the second air-cooling system to enter the shutdown state; and if the running state is a starting state, the running time is longer than the preset threshold value, the defrosting temperature is lower than the defrosting exit threshold value, and the temperature of the water outlet pipe is higher than the defrosting water outlet threshold value, the second air cooling system and the first air cooling system are controlled to enter a defrosting mode.
Specifically, two systems sharing the air duct during defrosting of the air-cooled modular unit can select to start defrosting operation at the same time or one system enters defrosting operation and the other system is in standby state according to the judgment condition that the states of the two systems accord with the state of the two systems. Illustratively, if the two systems are the system a and the system B, respectively. If the system B is in a shutdown state at the moment, the system B cannot be started during defrosting of the system A; if the system B is in the running state, the system B enters a defrosting state simultaneously when the minimum heating time and other temperature conditions of the compressor are met; if the system B is in the running state and does not meet the minimum heating time and other temperature conditions, the compressor of the system B is stopped and is not started any more during the defrosting of the system A.
The defrosting control method provided by the embodiment is directed at the air-cooling module machines of at least two air-cooling systems including the common air channel, and when the condition that the first air-cooling system needs defrosting is determined, the second air-cooling system is detected to be stopped or started to defrost together with the first air-cooling system reasonably. Compared with the prior art, as long as any system in the air-cooled modular unit detects that defrosting is needed, namely the system starts defrosting operation, the energy consumption can be greatly saved, the system starting times can be reduced, the system is protected, and the service life of the system is prolonged.
Alternatively, based on the embodiment shown in fig. 5, in another embodiment of the present invention, a control strategy for pushing out the defrost in two systems sharing the air duct is described. Specifically, if two systems (system a and system B) sharing a duct do not simultaneously push out a defrost operation, for example: and C, the system A is still defrosting, the system B reaches an exit condition, the system B stops firstly, and after the defrosting of the system A is finished, whether the system B needs to be loaded for heating together is judged according to the temperature of a water outlet pipe and/or the shutdown duration of the system B.
In the embodiment, whether the system B is started again is controlled by judging the water temperature of the water outlet pipe and/or the shutdown time length of the water outlet pipe in the two systems which defrost simultaneously, and compared with the prior art, the system B and the system A are started simultaneously to enter heating operation after defrosting is finished, energy consumption can be saved, and the system starting times can be reduced. And the service life of the system is prolonged.
Fig. 6 is a schematic structural diagram of a defrosting control device according to an embodiment of the present invention. As shown in fig. 6, the defrost control apparatus 60 includes: .
An obtaining module 601, configured to obtain an evaporator temperature and an ambient temperature of a first air-cooling system;
a determining module 602, configured to determine a temperature difference threshold corresponding to the ambient temperature according to a preset first corresponding relationship, where the first corresponding relationship includes multiple ambient temperature intervals and temperature difference thresholds corresponding to the multiple ambient temperature intervals;
a first control module 603, configured to control the first air-cooling system to start a defrosting operation if a temperature difference between the ambient temperature and the evaporator temperature satisfies the temperature difference threshold.
According to the defrosting control device provided by the embodiment of the invention, the environment temperature of the environment where the first air cooling system is located is obtained while the temperature of the evaporator is obtained, the temperature difference between the environment temperature and the temperature of the evaporator is monitored, and when the temperature difference meets the temperature difference threshold corresponding to the environment temperature, the first air cooling system is controlled to start defrosting operation, so that the environment temperature can be taken into account, different temperature difference thresholds are set for different environment temperature intervals, the defrosting control can dynamically adapt to the environment temperature, and the rationality of the defrosting control is greatly improved.
Fig. 7 is a schematic structural diagram of a defrosting control apparatus according to another embodiment of the present invention. As shown in fig. 7, the defrosting control apparatus 60 further includes: .
Optionally, the apparatus 60 further comprises:
the second control module 604 controls the first air-cooling system to start the defrosting operation if the evaporator temperature meets a preset defrosting temperature threshold.
Optionally, the apparatus 60 further comprises:
a calculating module 605, configured to calculate the defrosting temperature threshold according to a product of a first coefficient and the ambient temperature if the ambient temperature is less than or equal to a first preset temperature; alternatively, the first and second liquid crystal display panels may be,
and if the environment temperature is higher than a second preset temperature, calculating the defrosting temperature threshold according to the product of a second coefficient and the environment temperature, wherein the first preset temperature is lower than the second preset temperature, and the first coefficient is higher than the second coefficient.
Optionally, the apparatus 60 further comprises:
a correction module 606, configured to obtain a last defrosting time of the first air-cooling system;
and correcting the defrosting temperature threshold according to the last defrosting time.
Optionally, the modification module 606 is specifically configured to:
if the last defrosting time is shorter than a first preset time, reducing the defrosting temperature threshold by a first value; alternatively, the first and second electrodes may be,
and if the last defrosting time is longer than a second preset time, increasing the defrosting temperature threshold by a second numerical value, wherein the first preset time is shorter than the second preset time, and the first numerical value and the second numerical value are positive numbers.
Optionally, the apparatus 60 further comprises:
a third control module 607, configured to determine a defrosting interval threshold for the current defrosting according to the last defrosting time and the last defrosting interval time;
and if the last defrosting time of the current time distance meets the defrosting interval threshold, controlling the first air cooling system to start defrosting operation.
Optionally, the apparatus 60 further comprises:
a fourth control module 608, configured to control the second air-cooling system to start a defrosting operation if a state of the second air-cooling system meets a preset condition; the second air cooling system and the first air cooling system belong to the same air cooling module unit and share an air duct; the status includes at least one of: running state, running duration, evaporator temperature and outlet pipe temperature.
The defrosting control device provided by the embodiment of the invention can be used for executing the method embodiment, the implementation principle and the technical effect are similar, and the details are not repeated here.
Fig. 8 is a schematic hardware structure diagram of a defrosting control device according to an embodiment of the present invention. As shown in fig. 8, the present embodiment provides a defrosting control apparatus 80 including: at least one processor 801 and a memory 802. The defrost control device 80 further includes a communication component 803. The processor 801, the memory 802, and the communication unit 803 are connected by a bus 804.
In a specific implementation process, the at least one processor 801 obtains the evaporator temperature collected by the fin temperature sensor and the ambient temperature collected by the ambient temperature sensor, and after obtaining the evaporator temperature and the ambient temperature, executes the computer execution instructions stored in the memory 802, so that the at least one processor 801 executes the defrosting control method executed by the defrosting control device 80 as described above to control the defrosting operation of the first air-cooling system.
When the determination operation of whether or not to start defrosting of the present embodiment is performed by the server, the communication section 803 may transmit the evaporator temperature and the ambient temperature to the server.
For a specific implementation process of the processor 801, reference may be made to the above method embodiments, which have similar implementation principles and technical effects, and details of this embodiment are not described herein again.
In the embodiment shown in fig. 8, it should be understood that the Processor may be a Central Processing Unit (CPU), other general purpose processors, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present invention may be embodied directly in a hardware processor, or in a combination of hardware and software modules.
The memory may comprise high speed RAM memory, and may also include non-volatile storage NVM, such as at least one disk memory.
The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, the buses in the figures of the present application are not limited to only one bus or one type of bus.
Fig. 9 is a schematic diagram of a hardware structure of an air-cooling module unit according to an embodiment of the present invention. As shown in fig. 9, the air-cooled module assembly 90 provided in this embodiment includes: at least one first air cooling system 901 and the defrost control device 80 as described in fig. 8;
the defrosting control device 80 is connected to the first air cooling system 901, and is configured to execute the defrosting control method according to the embodiment shown in fig. 2 to 4, and perform defrosting control on the first air cooling system.
In this embodiment, the air-cooling module unit 90 may further include an ambient temperature sensor for measuring ambient temperature, the ambient temperature sensor is set to be peripheral to the module unit, for example, on a metal plate on the surface of the module unit, the first air-cooling system 901 is provided with a temperature sensor 9011, and the temperature sensor 9011 may include a fin temperature sensor arranged on a fin of the evaporator and used for measuring the temperature of the evaporator.
In a specific implementation process, the defrosting control device 80 obtains the evaporator temperature collected by the fin temperature sensor and the environment temperature collected by the environment temperature sensor, and after obtaining the evaporator temperature and the environment temperature, executes the defrosting control method described in the embodiments shown in fig. 2 to 4 to control the defrosting operation of the first air-cooling system.
The air-cooled module unit 90 that this embodiment provided, also acquire the ambient temperature of first air-cooled system place environment through when acquiring the evaporimeter temperature, and monitor through the difference in temperature between ambient temperature and the evaporimeter temperature, when this difference in temperature satisfies the difference in temperature threshold value that this ambient temperature corresponds, control first air-cooled system and start defrosting operation, can take into account ambient temperature, and set for different difference in temperature thresholds to different ambient temperature intervals, make defrosting control can realize dynamic adaptation to ambient temperature, the rationality of defrosting control has been improved greatly.
Optionally, as shown in fig. 9, an air-cooled modular unit according to another embodiment of the present invention further includes: at least one second air cooling system 902.
The defrosting control device 80 is connected to the second air-cooling system 902, and is further configured to execute the defrosting control method described in the embodiment shown in fig. 5 to perform defrosting control on the second air-cooling system.
In this embodiment, the second air cooling system 902 is provided with a temperature sensor 9021, the temperature sensor 9021 may include a water temperature sensor for measuring the temperature of the water outlet pipe, and the water temperature sensor may be disposed on the water outlet pipe of the condenser.
In a specific implementation process, the defrosting control device 80 obtains the evaporator temperature collected by the fin temperature sensor of the first air-cooling system 901, the water temperature sensor of the second air-cooling system 902, and the environmental temperature collected by the environmental temperature sensor, and after obtaining the evaporator temperature and the environmental temperature, executes the defrosting control method according to the embodiment shown in fig. 5 to control the defrosting operation of the second air-cooling system.
The air-cooled modular unit 90 provided in this embodiment is directed to the air-cooled modular units including at least two air-cooled systems sharing an air duct, and when it is determined that a first air-cooled system therein needs defrosting, the state of a second air-cooled system sharing the air duct is detected, so that the second air-cooled system can be reasonably controlled to stop or start defrosting operation together with the first air-cooled system. Compared with the prior art, as long as any system in the air-cooled modular unit detects that defrosting is needed, namely the system starts defrosting operation, the energy consumption can be greatly saved, the system starting times can be reduced, the system is protected, and the service life of the system is prolonged.
The present application also provides a computer-readable storage medium, in which computer-executable instructions are stored, and when a processor executes the computer-executable instructions, a defrosting control method performed by the above defrosting control device is implemented.
The computer-readable storage medium may be implemented by any type of volatile or non-volatile storage device or combination thereof, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk. A readable storage medium may be any available medium that can be accessed by a general purpose or special purpose computer.
An exemplary readable storage medium is coupled to the processor such the processor can read information from, and write information to, the readable storage medium. Of course, the readable storage medium may also be an integral part of the processor. The processor and the readable storage medium may reside in an Application Specific Integrated Circuits (ASIC). Of course, the processor and the readable storage medium may also reside as discrete components in the apparatus.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The foregoing program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A defrost control method, comprising:
acquiring the evaporator temperature and the ambient temperature of a first air cooling system;
if the environment temperature is less than or equal to a first preset temperature, calculating the defrosting temperature threshold value according to the product of a first coefficient and the environment temperature; alternatively, the first and second liquid crystal display panels may be,
if the environment temperature is higher than a second preset temperature, calculating the defrosting temperature threshold value according to the product of a second coefficient and the environment temperature, wherein the first preset temperature is lower than the second preset temperature, and the first coefficient is higher than the second coefficient;
if the temperature of the evaporator meets a set defrosting temperature threshold value, controlling the first air cooling system to start defrosting operation;
determining a temperature difference threshold corresponding to the environment temperature according to a preset first corresponding relation, wherein the first corresponding relation comprises a plurality of environment temperature intervals and temperature difference thresholds corresponding to the environment temperature intervals;
if the temperature difference between the environment temperature and the evaporator temperature meets the temperature difference threshold value, controlling the first air cooling system to start defrosting operation;
the method further comprises the following steps:
determining a defrosting interval threshold value of the current defrosting according to the last defrosting time and the last defrosting interval time;
and if the last defrosting time of the current time distance meets the defrosting interval threshold, controlling the first air cooling system to start defrosting operation.
2. The method of claim 1, further comprising:
acquiring last defrosting time of the first air cooling system;
and correcting the defrosting temperature threshold according to the last defrosting time.
3. The method of claim 2, wherein said modifying said defrost temperature threshold based on said last defrost time comprises:
if the last defrosting time is shorter than a first preset time, reducing the defrosting temperature threshold by a first value; alternatively, the first and second liquid crystal display panels may be,
and if the last defrosting time is longer than a second preset time, increasing the defrosting temperature threshold by a second numerical value, wherein the first preset time is shorter than the second preset time, and the first numerical value and the second numerical value are positive numbers.
4. The method of claim 1, further comprising:
if the state of the second air-cooling system meets the preset condition, controlling the second air-cooling system to start defrosting operation; the second air cooling system and the first air cooling system belong to the same air cooling module unit and share an air duct; the status includes at least one of: running state, running duration, evaporator temperature, outlet pipe temperature.
5. A defrost control apparatus, comprising: at least one processor and a memory;
the memory stores computer-executable instructions;
the at least one processor executing the computer-executable instructions stored by the memory causes the at least one processor to perform the defrost control method of any of claims 1-4.
6. An air-cooled modular unit, comprising: at least one first air cooling system and the defrost control apparatus of claim 5;
the defrosting control device is connected with the first air cooling system and used for executing the defrosting control method according to any one of claims 1 to 3 and carrying out defrosting control on the first air cooling system.
7. The air-cooled modular unit of claim 6, further comprising at least a second air-cooled system;
the defrosting control device is connected with the second air cooling system and is also used for executing the defrosting control method according to claim 4 and carrying out defrosting control on the second air cooling system.
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| CN107131611B (en) * | 2017-05-17 | 2020-05-29 | 青岛海尔空调器有限总公司 | Defrosting control method for air conditioner |
| CN109539622A (en) * | 2018-11-30 | 2019-03-29 | 上海海立睿能环境技术有限公司 | A kind of net for air-source heat pump units and its defrosting control method |
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