CN114264094B - Defrosting control method and refrigerating system - Google Patents
Defrosting control method and refrigerating system Download PDFInfo
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- CN114264094B CN114264094B CN202111534885.XA CN202111534885A CN114264094B CN 114264094 B CN114264094 B CN 114264094B CN 202111534885 A CN202111534885 A CN 202111534885A CN 114264094 B CN114264094 B CN 114264094B
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Abstract
The invention provides a defrosting control method and a refrigerating system, and relates to the technical field of refrigerating equipment, wherein the defrosting control method comprises the steps of acquiring the temperature and the relative humidity of an outdoor dry bulb during the operation of the refrigerating system; judging whether the refrigerating system is in a frosting working condition or not according to the temperature and the relative humidity of the outdoor dry bulb; when the refrigerating system is in a frosting working condition, acquiring a pressure difference delta P between an air inlet and an air outlet of the refrigerating system; and comparing the pressure difference delta P between the air inlet and the air outlet of the refrigeration system with a set pressure difference value, and executing preset subsequent treatment based on the comparison result. The invention provides an intelligent defrosting system from direct influence of frosting temperature conditions, humidity conditions and frosting on a finned tube heat exchanger, namely influence of front and back pressure difference.
Description
Technical Field
The invention relates to the technical field of refrigeration equipment, in particular to a defrosting control method and a refrigeration system.
Background
When the refrigerating and freezing unit works, the finned tube heat exchanger is an evaporator. When the surface temperature of the evaporator is below 0 c, a frosting phenomenon occurs. Along with the increase of the operation time, the frost layer is continuously thickened, so that the air resistance among the fins is increased, and the heat exchange efficiency of the heat exchanger is reduced. Therefore, a defrosting process must be performed.
The defrosting mode commonly used at present is four-way valve heat pump defrosting, hot air defrosting or electric heating defrosting. The defrosting modes are usually a mode of jointly controlling the surface temperature of the evaporator finned tube and the running time of the compressor by adopting a thermocouple or a platinum resistance sensor, and a mode of indirectly controlling state parameters such as air inlet and outlet temperature difference, air suction pressure and the like.
In the former control mode, only temperature and time are controlled, so that the phenomenon that although the temperature of the finned tube is low after defrosting is carried out in a low-temperature drying environment or a sealed space for several times, frost is not formed due to too low air humidity, frost is mistakenly dissolved, temperature fluctuation is caused, and energy is wasted; although the latter control mode increases the temperature difference of inlet and outlet air and the state parameters of suction pressure for indirect control, the change of the indirect parameters is not the change caused by the only variable of frosting, and the quality problem of frequent or no frosting of the frosting control is often caused by the interference of various factors such as system fluctuation, the control of a throttle valve, the quantity of refrigerant in the system and the like.
Disclosure of Invention
The invention aims to provide a defrosting control method and a refrigerating system, and aims to solve the technical problem that in the prior art, when the refrigerating system adopts temperature and time, air inlet and outlet temperature difference and air suction pressure as defrosting parameters for judgment, defrosting is mistaken or not.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a defrosting control method which comprises the following steps
Acquiring the outdoor dry bulb temperature and the relative humidity during the operation of the refrigeration system;
and judging whether the refrigerating system is in a frosting working condition or not according to the outdoor dry bulb temperature and the relative humidity.
As a further improvement of the invention, when the refrigerating system is in a frosting working condition, acquiring the pressure difference delta P between the air inlet and the air outlet of the refrigerating system;
and comparing the pressure difference delta P between the air inlet and the air outlet of the refrigeration system with a set pressure difference value, and executing preset subsequent treatment based on the comparison result.
As a further improvement of the invention, the judging whether the refrigerating system is in a frosting condition or not according to the outdoor temperature of the dry bulb and the relative humidity comprises
When the outdoor dry bulb temperature is lower than a first preset temperature and the relative humidity is less than or equal to 70%, the refrigerating system is in a non-frosting working condition;
when the outdoor dry bulb temperature is lower than a first preset temperature and the relative humidity is higher than 70%, the refrigerating system is in a frosting working condition;
when the outdoor dry bulb temperature is higher than a first preset temperature, lower than a second preset temperature and the relative humidity is less than or equal to 60%, the refrigerating system is in a non-frosting working condition;
when the outdoor dry bulb temperature is higher than a first preset temperature, lower than a second preset temperature and the relative humidity is higher than 60%, the refrigerating system is in a frosting working condition;
and when the outdoor dry bulb temperature is higher than the second preset temperature, the refrigerating system is in a non-frosting working condition.
As a further improvement of the present invention, the first preset temperature is-5 ℃.
As a further improvement of the present invention, the second predetermined temperature is 10 ℃.
As a further improvement of the invention, said set differential pressure value compared to the differential pressure Δ P between the air inlet and outlet of said refrigeration system comprises
A first set differential pressure value P1 and a second set differential pressure value P2, the first set differential pressure value P1 being less than the second set differential pressure value P2.
As a further improvement of the invention, based on the comparison result, the execution of the preset subsequent processing includes
When the pressure difference delta P between the air inlet and the air outlet of the refrigeration system is smaller than the first set pressure difference value P1, the refrigeration system receives a continuous operation instruction, and the defrosting processing module does not operate;
when the pressure difference delta P between the air inlet and the air outlet of the refrigeration system is larger than the first set pressure difference value P1 and smaller than the second set pressure difference value P2, the refrigeration system receives a short-time operation instruction and stops operating after operating for a set time, and the defrosting processing module receives the operation instruction and starts defrosting;
and when the pressure difference delta P between the air inlet and the air outlet of the refrigerating system is greater than the second set pressure difference value P2, the refrigerating system receives a stop instruction, stops refrigerating, and the defrosting processing module receives an operation instruction to start defrosting.
As a further improvement of the present invention, the refrigeration system receives a short-time operation command, and the operation setting time is 2 hours.
As a further improvement of the invention, when the pressure difference Δ P between the air inlet and the air outlet of the refrigeration system is greater than the first set differential pressure value P1 and less than the second set differential pressure value P2, the refrigeration system receives a short-time operation instruction and stops operating after operating for a set time, and the defrosting processing module receives the operation instruction and starts defrosting; after the first defrosting is finished, recording the running time T1 of the refrigerating system within the first 1 hour, and then recording the running time T of the refrigerating system within the subsequent each hour;
when the running time T of the refrigeration system is larger than or equal to NT1, the refrigeration system receives a shutdown instruction and stops refrigeration, and the defrosting processing module receives the running instruction to carry out secondary defrosting; wherein N is a constant greater than 1.
As a further improvement of the present invention, when the pressure difference Δ P between the air inlet and the air outlet of the refrigeration system is smaller than the first set pressure difference value P1, the refrigeration system receives a continuous operation instruction, the defrosting processing module does not operate, when the pressure difference comparison is performed for a plurality of times, the refrigeration system is not in the frosting condition but is not frosted, and the accumulated running time of the refrigeration system is greater than or equal to the set maximum continuous running time T2, the refrigeration system receives a shutdown instruction, stops refrigerating, and the defrosting processing module receives a running instruction, and enters forced defrosting.
As a further improvement of the invention, after the refrigeration system carries out defrosting, the defrosting exit condition is judged, and when the defrosting exit condition is reached, the defrosting exits.
As a further improvement of the invention, said achieving of defrosting exit condition comprises
When the pressure difference delta P between the air inlet and the air outlet of the refrigeration system is smaller than the first set pressure difference value P1;
or it is that,
acquiring the temperature T0 in the refrigeration system, and when the temperature T0 in the refrigeration system is greater than a set temperature;
or, alternatively, the number of the first and second,
the defrosting operation time is more than the set defrosting time t.
As a further improvement of the invention, the set temperature is 10 ℃.
As a further improvement of the invention, the set defrosting time t is not more than 20% of the running time of the refrigerating system.
The invention provides a refrigeration system, which comprises
A memory having an executable program stored thereon;
a processor for executing the executable program in the memory to implement the steps of the defrosting control method.
As a further improvement of the invention, the refrigerating system is a freezing and refrigerating device.
As a further improvement of the present invention, the freezing and refrigerating apparatus includes an evaporator, a temperature sensor provided on a front side of the evaporator, and a differential pressure sensor provided before and after the evaporator.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a defrosting control method, which aims at the defrosting problem of a refrigeration and cold storage device in operation, provides an intelligent defrosting system according to the defects of the existing defrosting control and from the direct influence of the frosting temperature condition, the frosting humidity condition and the frosting on a finned tube heat exchanger, namely the influence of the front-back pressure difference, and combines the temperature, the humidity and the front-back pressure difference as defrosting judgment parameters to ensure that a unit is frosted and unfrozen, so that the comprehensive energy efficiency and the operation reliability of the system are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a graph of the relationship between the frosting speed and the dry bulb temperature and the relative humidity in the defrosting control method of the present invention;
fig. 2 is a schematic diagram of the refrigeration system of the present invention.
In figure 1, an evaporator; 2. a temperature sensor; 3. a differential pressure sensor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
As shown in FIG. 1, the present invention provides a defrosting control method, comprising
Acquiring the outdoor dry bulb temperature and the relative humidity during the operation of the refrigeration system;
judging whether the refrigerating system is in a frosting working condition or not according to the outdoor dry bulb temperature and the relative humidity;
when the refrigerating system is in a frosting working condition, acquiring a pressure difference delta P between an air inlet and an air outlet of the refrigerating system;
and comparing the pressure difference delta P between the air inlet and the air outlet of the refrigeration system with a set pressure difference value, and executing preset subsequent treatment based on the comparison result.
When the refrigerating system is in a non-frosting working condition, the refrigerating system does not need defrosting and defrosting.
As is well known, when the finned tubes are in a frosting working condition, the thickness of a frost layer is increased along with the increase of the frosting amount, so that the spacing between the finned tubes is reduced, the equivalent diameter of the finned tubes is reduced, the wind speed of the narrowest section is increased, the pressure drop is gradually increased along with the increase of the wind speed, the wind volume of the fan is gradually reduced along with the increase of the static pressure due to the characteristics of the fan, and when the static pressure of the fan reaches a certain value, the wind volume of the fan is sharply reduced, and finally the refrigerating capacity is sharply reduced. Meanwhile, in the frosting process, the heat exchange effect of the heat exchanger is gradually reduced due to the heat insulation effect of the frost layer. Therefore, after frosting, the fin distance is directly influenced, the static pressure of the fan is increased, the air quantity is reduced, and the heat exchange performance is indirectly influenced.
The defrosting control method provided by the invention aims at the defrosting problem of the refrigeration equipment in operation, and provides an intelligent defrosting system according to the defects of the existing defrosting control, wherein the direct influence of the frosting temperature condition, the frosting humidity condition and the frosting on the finned tube heat exchanger, namely the influence of the front-back pressure difference is combined with the temperature, the frosting humidity and the front-back pressure difference as defrosting judgment parameters, so that the intelligent defrosting process is realized, the frosting and frostless change of a unit is ensured, the operation reliability of the system is improved, the storage temperature fluctuation is reduced, the comprehensive energy efficiency of the system operation is improved, and the defrosting energy consumption is reduced.
Referring to FIG. 1, FIG. 1 is a graph showing the variation of frosting rate with outdoor weather parameters, specifically, a graph showing the relationship between frosting rate and outdoor dry bulb temperature and relative humidity, wherein the dotted line is a line of equal frosting rate, because the density of the frost layer is small, the frosting on the surface of the coil pipe is already serious when the frosting amount Wm on the outer surface is greater than 0.625 x 10-5 kg/(m 2*s), so the frosting condition is determined when the frosting amount is greater than the line of equal frosting rate of 0.625 x 10-5 kg/(m 2*s), and the frosting condition is ignored when the frosting amount is less than the range.
Judging whether the refrigerating system is in frosting condition according to the outdoor temperature and relative humidity of the dry ball, including
When the outdoor dry bulb temperature is lower than a first preset temperature and the relative humidity is less than or equal to 70%, the refrigerating system is in a non-frosting working condition;
when the outdoor dry bulb temperature is lower than a first preset temperature and the relative humidity is higher than 70%, the refrigerating system is in a frosting working condition;
when the outdoor dry bulb temperature is higher than a first preset temperature, lower than a second preset temperature and the relative humidity is less than or equal to 60%, the refrigerating system is in a non-frosting working condition;
when the outdoor dry bulb temperature is higher than a first preset temperature, lower than a second preset temperature and the relative humidity is higher than 60%, the refrigerating system is in a frosting working condition;
and when the outdoor dry bulb temperature is higher than the second preset temperature, the refrigerating system is in a non-frosting working condition.
Specifically, the first preset temperature is-5 ℃, and the second preset temperature is 10 ℃. That is to say:
when the outdoor dry bulb temperature is less than-5 ℃ and the relative humidity is less than or equal to 70%, the refrigerating system is in a non-frosting working condition;
when the outdoor dry bulb temperature is less than-5 ℃ and the relative humidity is more than 70%, the refrigerating system is in a frosting working condition;
when the outdoor dry bulb temperature is more than-5 ℃, less than 10 ℃ and the relative humidity is less than or equal to 60 percent, the refrigerating system is in a non-frosting working condition;
when the outdoor dry bulb temperature is more than-5 ℃, less than 10 ℃ and the relative humidity is more than 60%, the refrigerating system is in a frosting working condition;
when the temperature of the outdoor dry bulb is more than 10 ℃, the refrigerating system is in a non-frosting working condition.
According to the method for judging whether the refrigeration system is in the frosting working condition or not according to the outdoor temperature and the relative humidity of the dry bulb, the frosting working condition and the non-frosting working condition are effectively distinguished, in the non-frosting working condition, the refrigeration system does not defrost, the phenomenon that mistaken defrosting is caused due to too small air humidity and temperature fluctuation and energy waste are caused because the refrigeration system is not frosted when the refrigeration system is only controlled by temperature and time or the finned tube temperature is very low after defrosting for a plurality of times in a sealed space is avoided, the refrigeration system is closed in the defrosting process, the temperature in a compartment can rise again, and the temperature of the compartment can rise in the heating defrosting process, and the defrosting working condition and the non-defrosting working condition are effectively distinguished, so that the refrigeration system can be prevented from defrosting in the non-defrosting working condition and the temperature fluctuation in the compartment is avoided;
in one embodiment, the set differential pressure value compared to the differential pressure Δ P between the inlet and outlet vents of the refrigeration system further comprises
A first set differential pressure value P1 and a second set differential pressure value P2, the first set differential pressure value P1 being less than the second set differential pressure value P2.
Based on the comparison result, performing preset subsequent processing including
When the pressure difference delta P between the air inlet and the air outlet of the refrigerating system is smaller than a first set pressure difference value P1, the refrigerating system receives a continuous operation instruction, the defrosting processing module does not operate, and the defrosting state is not needed at the moment;
when the pressure difference delta P between the air inlet and the air outlet of the refrigeration system is larger than a first set pressure difference value P1 and smaller than a second set pressure difference value P2, the refrigeration system receives a short-time operation instruction and stops operating after operating for a set time, and the defrosting processing module receives the operation instruction and starts defrosting; at the moment, the frosting of the refrigerating system is not serious, and the defrosting can be postponed;
when the pressure difference delta P between the air inlet and the air outlet of the refrigeration system is larger than a second set pressure difference value P2, the refrigeration system receives a stop instruction, refrigeration is stopped, and the defrosting processing module receives an operation instruction and starts defrosting. This indicates that the frosting is severe and requires immediate defrosting.
At the operating mode that frosts, refrigerating system is through the data to gathering pressure differential around the evaporimeter, judge whether refrigerating system reaches the requirement of changing frost, thereby it changes frost to reach to have the frost, intelligent frost, avoid conventional refrigerating system to pass through business turn over wind difference in temperature control, because the in-process that frosts is along with the increase on frost layer, the heat transfer effect is more and more poor, business turn over wind difference in temperature crescent, and reach under the condition of certain thickness on frost layer, the fin interval is stifled, the windage grow, the amount of wind through the heat exchanger diminishes, business turn over wind difference in temperature has the gradual reduction, all change the phenomenon that frost easily causes the mistake to change through business turn over wind difference in temperature control. The invention directly collects the air inlet and outlet pressure difference of the evaporator to control defrosting, and the air inlet and outlet pressure difference of the evaporator is gradually increased along with the increase of the defrosting amount, so that the phenomenon of defrosting by mistake can be effectively avoided. By the system configuration and the system control, the frosting and non-frosting of the evaporator can be effectively ensured, the running reliability of the system is improved, and the temperature fluctuation of the storage is reduced, so that the comprehensive energy efficiency of the system is further improved.
In one embodiment, when defrosting is postponed, the refrigeration system receives a short-time operation command, and the operation is set for 2 hours. That is, when the pressure difference Δ P between the air inlet and outlet of the refrigeration system is between P1 and P2, the defrosting process is performed after the refrigeration system continues to operate for 2 hours. After defrosting treatment, whether defrosting is needed again is judged, and the specific judgment mode is as follows:
when the pressure difference delta P between the air inlet and the air outlet of the refrigeration system is larger than a first set pressure difference value P1 and smaller than a second set pressure difference value P2, the refrigeration system receives a short-time operation instruction and stops operating after operating for a set time, and the defrosting processing module receives the operation instruction and starts defrosting; after the first defrosting is finished, recording the running time T1 of the refrigerating system within the first 1 hour, and then recording the running time T of the refrigerating system within the subsequent each hour;
when the running time T of the refrigerating system is larger than or equal to NT1, namely the running time of the subsequent refrigerating system is longer and longer per hour, which indicates that defrosting is incomplete, at the moment, the refrigerating system receives a shutdown instruction, refrigeration is stopped, and the defrosting processing module receives the running instruction to carry out second defrosting; wherein N is a constant greater than 1.
When the pressure difference delta P between the air inlet and the air outlet of the refrigeration system is smaller than a first set pressure difference value P1, the refrigeration system receives a continuous operation instruction, and the defrosting processing module does not operate; if the refrigeration system is in the frosting working condition, but the front and rear differential pressure values are always lower than the set differential pressure value, so that the long-term defrosting is not caused, the efficiency of the refrigeration system is easily influenced, and therefore the following forced defrosting treatment procedures are set: when the pressure difference comparison is carried out for multiple times, the refrigerating system is not in the frosting working condition and is not defrosted, and the running time accumulation of the refrigerating system is greater than or equal to the set maximum continuous running time T2, the refrigerating system receives a shutdown instruction and stops refrigerating, and the defrosting processing module receives a running instruction and enters forced defrosting. Wherein, the time T2 is more than NT1 and more than the multiple running time of the refrigerating system, and the specific value is set according to the actual situation.
In one embodiment, after defrosting, the refrigeration system determines a defrosting exit condition, and exits defrosting when the defrosting exit condition is reached. Specifically, the refrigeration system may determine the exiting condition after defrosting for a certain time, and the certain time may be long or short, and the exiting condition may be determined when defrosting of the refrigeration system is started, or may be run for a certain time, and the length of the time may be set according to an actual situation, which is not specifically limited herein.
Reach defrosting exit conditions comprising
When the pressure difference delta P between the air inlet and the air outlet of the refrigerating system is smaller than a first set pressure difference value P1;
or it is that,
acquiring the temperature T0 in the refrigeration system, and when the temperature T0 in the refrigeration system is greater than a set temperature;
or alternatively it is that,
the defrosting operation time is greater than the set defrosting time t.
When any one of the three defrosting exiting conditions is reached, the defrosting can be stopped.
Specifically, the set temperature was 10 ℃.
Specifically, the defrosting time t is set to be not more than 20% of the running time of the refrigerating system.
The invention provides a refrigeration system, comprising
A memory having an executable program stored thereon;
and the processor is used for executing the executable program in the memory so as to realize the steps of the defrosting control method.
In one embodiment, the refrigeration system is a refrigeration chiller.
As shown in fig. 2, in one embodiment, the freezing and refrigerating apparatus includes an evaporator 1, a temperature sensor 2 disposed at a front side of the evaporator 1, and a differential pressure sensor 3 disposed at front and rear of the evaporator 1.
It should be noted that, first, the "inward" is a direction toward the center of the accommodating space, and the "outward" is a direction away from the center of the accommodating space.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in fig. 1 to facilitate the description of the invention and to simplify the description, but are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A defrosting control method is characterized by comprising
Acquiring the outdoor dry bulb temperature and the relative humidity during the operation of the refrigeration system;
judging whether the refrigerating system is in a frosting working condition or not according to the outdoor dry bulb temperature and the relative humidity;
when the refrigerating system is in a frosting working condition, acquiring a pressure difference delta P between an air inlet and an air outlet of the refrigerating system;
comparing the pressure difference delta P between the air inlet and the air outlet of the refrigeration system with a set pressure difference value, and executing preset subsequent treatment based on the comparison result;
said set differential pressure value, compared to the differential pressure Δ P between the air inlet and outlet of said refrigeration system, comprises
A first set differential pressure value P1 and a second set differential pressure value P2, the first set differential pressure value P1 being less than the second set differential pressure value P2;
based on the comparison result, performing preset subsequent processing including
When the pressure difference delta P between the air inlet and the air outlet of the refrigerating system is smaller than the first set pressure difference value P1, the refrigerating system receives a continuous operation instruction, and the defrosting processing module does not operate; when the pressure difference comparison is carried out for multiple times, the refrigerating system is not in the frosting working condition and is not defrosted, and the running time accumulation of the refrigerating system is greater than or equal to the set maximum continuous running time T2, the refrigerating system receives a shutdown instruction and stops refrigerating, and the defrosting processing module receives a running instruction and enters forced defrosting;
when the pressure difference delta P between the air inlet and the air outlet of the refrigeration system is larger than the first set pressure difference value P1 and smaller than the second set pressure difference value P2, the refrigeration system receives a short-time operation instruction and stops operating after operating for a set time, and the defrosting processing module receives the operation instruction and starts defrosting; after the first defrosting is finished, recording the running time T1 of the refrigerating system within the first 1 hour, and then recording the running time T of the refrigerating system within the subsequent each hour; when the running time T of the refrigeration system is larger than or equal to NT1, the refrigeration system receives a shutdown instruction and stops refrigeration, and the defrosting processing module receives the running instruction to carry out secondary defrosting; wherein N is a constant greater than 1;
when the pressure difference delta P between the air inlet and the air outlet of the refrigeration system is larger than the second set pressure difference value P2, the refrigeration system receives a stop instruction, refrigeration is stopped, and the defrosting processing module receives an operation instruction and starts defrosting.
2. The defrosting control method of claim 1 wherein the determining whether the refrigeration system is in a frosting condition based on the outdoor dry bulb temperature and the relative humidity comprises
When the outdoor dry bulb temperature is lower than a first preset temperature and the relative humidity is less than or equal to 70%, the refrigerating system is in a non-frosting working condition;
when the outdoor dry bulb temperature is lower than a first preset temperature and the relative humidity is higher than 70%, the refrigerating system is in a frosting working condition;
when the outdoor dry bulb temperature is higher than a first preset temperature, lower than a second preset temperature and the relative humidity is less than or equal to 60%, the refrigerating system is in a non-frosting working condition;
when the outdoor dry bulb temperature is higher than a first preset temperature, lower than a second preset temperature and the relative humidity is higher than 60%, the refrigerating system is in a frosting working condition;
and when the outdoor dry bulb temperature is higher than the second preset temperature, the refrigerating system is in a non-frosting working condition.
3. The defrosting control method of claim 1 wherein the refrigerant system receives a short time operation command and the operation setting time is 2 hours.
4. The defrosting control method according to claim 1, wherein after defrosting of the refrigeration system, a defrosting exit condition is determined, and when the defrosting exit condition is reached, defrosting is exited.
5. The defrosting control method of claim 4 wherein the reaching of the defrosting exit condition comprises
When the pressure difference delta P between the air inlet and the air outlet of the refrigeration system is smaller than the first set pressure difference value P1;
or it is that,
acquiring the temperature T0 in the refrigerating system, and when the temperature T0 in the refrigerating system is higher than a set temperature;
or it is that,
the defrosting operation time is greater than the set defrosting time t.
6. The defrosting control method according to claim 5, wherein the set temperature is 10 ℃.
7. The defrosting control method of claim 5 wherein the set defrosting time t is not more than 20% of the running time of the refrigeration system.
8. A refrigeration system, comprising
A memory having an executable program stored thereon;
a processor for executing the executable program in the memory to implement the steps of the defrosting control method of any one of claims 1 to 7.
9. The refrigeration system of claim 8 wherein the refrigeration system is a refrigerated freezer.
10. The refrigeration system of claim 9 wherein said freezer-refrigerator includes an evaporator, a temperature sensor disposed in front of said evaporator, and a differential pressure sensor disposed in front of and behind said evaporator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111534885.XA CN114264094B (en) | 2021-12-15 | 2021-12-15 | Defrosting control method and refrigerating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111534885.XA CN114264094B (en) | 2021-12-15 | 2021-12-15 | Defrosting control method and refrigerating system |
Publications (2)
| Publication Number | Publication Date |
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| CN115371209B (en) * | 2022-08-26 | 2024-07-23 | 珠海格力电器股份有限公司 | Defrosting time prediction method and device for air conditioner |
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| CN115807995B (en) * | 2022-12-08 | 2024-08-13 | 珠海格力电器股份有限公司 | Air conditioner heat control method, device, equipment and storage medium |
| CN116086065A (en) * | 2022-12-30 | 2023-05-09 | 广东开利暖通空调股份有限公司 | Frost monitoring and defrosting control device and method |
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| US7614249B2 (en) * | 2005-12-20 | 2009-11-10 | Lung Tan Hu | Multi-range cross defrosting heat pump system and humidity control system |
| CN105318492B (en) * | 2014-07-30 | 2017-06-06 | 广东美的集团芜湖制冷设备有限公司 | The defrosting control method and device of air-conditioner |
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