CN112880073A - Air conditioner, method for predicting remaining cold storage time, and computer-readable storage medium - Google Patents
Air conditioner, method for predicting remaining cold storage time, and computer-readable storage medium Download PDFInfo
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- CN112880073A CN112880073A CN201911212083.XA CN201911212083A CN112880073A CN 112880073 A CN112880073 A CN 112880073A CN 201911212083 A CN201911212083 A CN 201911212083A CN 112880073 A CN112880073 A CN 112880073A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/0017—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using cold storage bodies, e.g. ice
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
Abstract
The invention discloses a method for predicting residual cold accumulation time, an air conditioner and a computer readable storage medium, wherein the air conditioner comprises a cold accumulation loop and a cold accumulation box, the cold accumulation loop comprises a compressor, a first heat exchanger and a second heat exchanger which are sequentially connected, and the second heat exchanger is positioned in the cold accumulation box; the method for predicting the residual cold storage time comprises the following steps: acquiring the current temperature of the cold storage box; calculating the total refrigerating capacity required by the cold storage box when the current temperature is reduced to the preset cold storage temperature; and calculating the residual cold accumulation time according to the total refrigerating capacity and the refrigerating power of the air conditioner, wherein the residual cold accumulation time is in a positive proportional relation with the total refrigerating capacity, and the residual cold accumulation time is also in a negative proportional relation with the refrigerating power. The technical scheme of the invention can effectively reduce the prediction deviation of the residual cold accumulation time.
Description
Technical Field
The invention relates to the technical field of refrigeration equipment, in particular to a method for predicting residual cold accumulation time, an air conditioner and a computer readable storage medium.
Background
In the process of actually using the cold accumulation type air conditioner by a user, the cold accumulation degree can be displayed to the user by real-time display of the cold accumulation remaining time, and convenience in the use process of the user and visualization of the progress of the cold accumulation process are improved. The traditional technical scheme estimates the residual cold accumulation time by measuring the time of the complete cold accumulation process from high-temperature liquid water to low-temperature solid ice in a laboratory, and has the following defects: in the process of converting the ice blocks into water, along with the difference of the volumes of the ice and the water in the cold storage box, the real-time change of the temperature in the cold storage box and other factors, the temperature rise speed of the cold storage box is different at different stages, namely, the real-time change of the working condition can cause larger deviation of the prediction of the residual cold storage time.
Disclosure of Invention
The invention mainly aims to provide a method for predicting residual cold storage time, which aims to effectively reduce the deviation of the prediction of the residual cold storage time.
In order to achieve the purpose, the air conditioner provided by the invention comprises a cold accumulation loop and a cold accumulation box, wherein the cold accumulation loop comprises a compressor, a first heat exchanger and a second heat exchanger which are sequentially connected, and the second heat exchanger is positioned in the cold accumulation box;
the method for predicting the residual cold storage time comprises the following steps:
acquiring the current temperature of the cold storage box;
calculating the total refrigerating capacity required by the cold storage box when the current temperature is reduced to the preset cold storage temperature;
and calculating the residual cold accumulation time according to the total refrigerating capacity and the refrigerating power of the air conditioner, wherein the residual cold accumulation time is in a positive proportional relation with the total refrigerating capacity, and the residual cold accumulation time is also in a negative proportional relation with the refrigerating power.
Optionally, the step of calculating the total cooling capacity required by the cold storage box to decrease from the current temperature to the preset cold storage temperature includes:
determining that the current temperature is equal to 0 ℃;
acquiring a first mass of water in an ice-water mixture in a cold storage tank at a current temperature;
calculating first heat released by ice with the temperature of 0 ℃ in the water accumulation box at the current temperature according to the first mass and the phase change latent heat of the water with the temperature of 0 ℃, wherein the first heat is in direct proportion to the phase change latent heat of the water with the temperature of 0 ℃ and the first mass respectively;
calculating a second heat quantity released when all the ice in the ice-water mixture in the cold storage box is frozen at the current temperature and all the ice is reduced to the preset cold storage temperature from 0 ℃;
and calculating the total refrigerating capacity required by the cold storage box to be reduced from the current temperature to the preset cold storage temperature according to the first heat and the second heat, wherein the total refrigerating capacity is positively correlated with the first heat and the second heat respectively.
Optionally, the step of obtaining the first mass of water in the ice-water mixture in the cold storage tank at the current temperature includes:
acquiring a first water level in a cold storage tank at a current temperature;
determining a first volume of an ice-water mixture in the cold storage tank at the current temperature according to the first water level;
acquiring a second water level after ice in the cold storage tank is completely melted into water, wherein the second water level is a preset lowest water level;
determining a second volume of all water after the ice in the cold storage box is completely melted into water according to the second water level;
calculating the volume fraction of water in the ice-water mixture in the cold storage tank at the current temperature according to the first volume and the second volume, wherein the ratio of the first volume to the second volume is in negative correlation with the volume fraction of the water in the ice-water mixture;
and calculating the first mass according to the volume fraction of water in the ice-water mixture in the cold storage tank at the current temperature.
Optionally, the step of calculating a second amount of heat released by all the ice falling from 0 ℃ to the preset cold storage temperature after all the water in the ice-water mixture in the cold storage tank at the current temperature is frozen further includes:
acquiring a second mass of the ice-water mixture in the cold storage box;
calculating a second heat according to the total mass and the difference value between the current temperature and the preset cold accumulation temperature;
the second heat quantity is in direct proportion relation with the second mass, the difference value between the current temperature and the preset cold accumulation temperature.
Optionally, the step of calculating the total cooling capacity required by the cold storage box to decrease from the current temperature to the preset cold storage temperature further includes:
determining that the current temperature is greater than 0 ℃;
acquiring the second mass of all water after all ice cubes in the cold storage box are completely melted into water;
calculating a third heat quantity released by the cold storage box from the current temperature to 0 ℃ according to the second mass, the difference value between the current temperature and 0 ℃ and the specific heat capacity of water, wherein the third heat quantity is in direct proportion to the second mass, the difference value between the current temperature and 0 ℃ and the specific heat capacity of water respectively;
according to the second mass, the difference value between 0 ℃ and the preset cold accumulation temperature and the specific heat capacity of the ice, calculating fourth heat released by the cold accumulation box when the temperature of the cold accumulation box is reduced from 0 ℃ to the preset cold accumulation temperature, wherein the fourth heat is in direct proportion to the second mass, the difference value between 0 ℃ and the preset cold accumulation temperature and the specific heat capacity of the ice;
calculating fifth heat released by all water converted into ice at the temperature of 0 ℃ according to the second mass and the phase change latent heat of the water at the temperature of 0 ℃, wherein the fifth heat is in direct proportion to the second mass and the phase change latent heat of the water at the temperature of 0 ℃;
and calculating the total refrigerating capacity required by the cold storage box to be reduced from the current temperature to the preset cold storage temperature according to the third heat, the fourth heat and the fifth heat, wherein the total refrigerating capacity is in positive correlation with the third heat, the fourth heat and the fifth heat respectively.
Optionally, the step of calculating the total cooling capacity required by the cold storage box to decrease from the current temperature to the preset cold storage temperature further includes:
determining that the current temperature is less than 0 ℃;
acquiring the second mass of all water after all ice cubes in the cold storage box are completely melted into water;
calculating the total refrigerating capacity required by the cold storage box from the current temperature to the preset cold storage temperature according to the second mass, the difference value between 0 ℃ and the preset cold storage temperature and the specific heat capacity of the ice;
wherein, the total refrigerating capacity is in direct proportion relation with the second mass, the difference between 0 ℃ and the preset cold accumulation temperature and the specific heat capacity of the ice.
Optionally, the cooling power of the air conditioner is calculated by the ambient temperature and the power of the compressor.
The invention also provides an air conditioner, which comprises a cold accumulation loop and a cold accumulation box, wherein the cold accumulation loop comprises a compressor, a first heat exchanger and a second heat exchanger which are sequentially connected;
the air conditioner further comprises a memory, a processor and a computer program stored on the memory and executable on the processor, the computer program implementing the steps of the method as described above when executed by the processor.
Optionally, the cold accumulation loop further comprises a first pipe, and the first pipe is connected with the output port of the compressor, the first heat exchanger, the second heat exchanger and the suction port of the compressor in sequence;
the air conditioner further includes:
the first cold conveying loop comprises a cold conveying heat exchanger, a cold taking heat exchanger and a water pump, the cold taking heat exchanger, the water pump and the cold conveying heat exchanger are sequentially connected, and the second heat exchanger and the cold taking heat exchanger are arranged in the cold storage box; and the number of the first and second groups,
a second cold feed loop including a second piping and a third heat exchanger disposed on the second piping, the second piping having a first end and a second end, the first end and the second end being connected to the first piping, and the first end and the second end being connected to a piping between the compressor and the second heat exchanger.
The present invention also proposes a computer readable storage medium having stored thereon an air conditioner processing program which, when executed by a controller, implements the steps of the method for predicting remaining cold storage time as described above.
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 structures shown in the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a method for predicting remaining cold storage time according to an embodiment of the present invention;
FIG. 2 is a detailed flowchart of step S20 in FIG. 1;
FIG. 3 is a detailed flowchart of step S22 in FIG. 2;
FIG. 4 is a detailed flowchart of step S24 in FIG. 2;
FIG. 5 is a schematic view of another detailed flow chart of step S20 in FIG. 1;
FIG. 6 is a schematic view of a further detailed flow chart of step S20 in FIG. 1;
FIG. 7 is a schematic piping diagram of the air conditioner of the present invention;
fig. 8 is a schematic structural view of the inside of the cold storage box in fig. 7.
The reference numbers illustrate:
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is 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 addition, the meaning of "and/or" appearing throughout is to include three juxtapositions, exemplified by "A and/or B," including either the A or B arrangement, or both A and B satisfied arrangement. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a method for predicting residual cold accumulation time.
In the embodiment of the present invention, the method for predicting remaining cold storage time is applied to an air conditioner, please refer to fig. 7, the air conditioner includes a cold storage loop and a cold storage box 40, the cold storage loop includes a compressor 11, a first heat exchanger 12 and a second heat exchanger 13 which are connected in sequence, and the second heat exchanger 13 is located in the cold storage box 40.
Referring to fig. 1, the method for predicting the remaining cold storage time includes the following steps:
in step S10, the current temperature of the cold storage tank is acquired.
A temperature sensor is arranged in the cold storage box to detect the temperature in the cold storage box. In particular, a liquid, such as water, is stored in the cold storage tank for storing cold. The current temperature refers in particular to the temperature of water. When the water is fully frozen into ice, the current temperature refers to the temperature of the ice. In addition, since the contact condition between the water at each position in the cold storage tank and the second heat exchanger is different, the temperature of the water at each position in the cold storage tank is not completely consistent, for example, in some cases, the temperature of the water close to the second heat exchanger is higher than that of the water far away from the second heat exchanger. In order to make the current temperature more accurate, can set up the temperature of the temperature sensor of a plurality of simultaneous detection positions in the cold-storage tank, the current temperature is for synthesizing the temperature calculation of the temperature in a plurality of positions and reacing. In addition, the current temperature can be calculated according to the water temperature detected by one temperature sensor and the factors such as the environment temperature, the refrigerating power and the refrigerating time of the compressor. Alternatively, the current temperature may be a temperature directly detected by the temperature sensor.
In this step, when the current temperature is higher than 0 ℃, since the freezing point of water is 0 ℃, it is determined that water is in the cold storage tank at this time, and of course, a small amount of water may be frozen, but the amount is small and can be ignored. When the current temperature is equal to 0 ℃, the mixture of water and ice in the cold storage box is judged. When the current temperature is lower than 0 ℃, the cold storage box is judged to be completely ice, and similarly, a phenomenon that a small amount of water is not formed into ice blocks may exist, but the water temperature is low at the moment, and the heat released by the small amount of water formed into ice blocks is very little, so that the heat can be ignored.
And step S20, calculating the total cooling capacity required by the cold storage box to reduce the current temperature to the preset cold storage temperature.
In this step, the cold storage tank is lowered from the current temperature to a preset cold storage temperature, specifically, the water or ice in the cold storage tank is lowered from the current temperature to the preset cold storage temperature. The preset cold storage temperature is a temperature pre-stored in the memory, and may be a temperature set by a factory or a temperature set by a user later. After the preset cold accumulation temperature is reached, the water in the cold accumulation box is indicated to be full of cold accumulation, at the moment, the compressor can stop running, and the air conditioner utilizes the cold accumulation in the cold accumulation box to refrigerate indoors. The water is required to release heat when the current temperature of the water is reduced to the preset cold accumulation temperature, and in order to enable the water to release the heat of the water, the refrigerating capacity required by the system is the total refrigerating capacity.
And step S30, calculating the residual cold accumulation time according to the total refrigerating capacity and the refrigerating power of the air conditioner, wherein the residual cold accumulation time is in a positive proportional relation with the total refrigerating capacity, and the residual cold accumulation time is also in a negative proportional relation with the refrigerating power.
In this step, the remaining cool storage time refers to a time required for the water in the cool storage tank to fall from the current temperature to the preset cool storage temperature. The residual cold accumulation time and the total refrigerating capacity are in a direct proportional relation, which means that the residual cold accumulation time is increased in the same proportion along with the increase of the total refrigerating capacity, and the residual cold accumulation time is decreased in the same proportion along with the decrease of the total refrigerating capacity. The residual cold accumulation time is in a negative proportional relation with the refrigerating power, which means that the residual cold accumulation time is reduced in the same proportion as the refrigerating power is increased, and the residual cold accumulation time is increased in the same proportion as the refrigerating power is reduced. Optionally, the cooling power of the air conditioner is calculated by the ambient temperature and the power of the compressor.
Specifically, in one embodiment, Q/Q is given by the formula τeCalculating the residual cold accumulation time tau, wherein Q is the total refrigerating capacity required by the cold accumulation box to drop from the current temperature T to the preset cold accumulation temperature Ts, QeThe refrigeration power of the refrigeration system.
In the traditional scheme, the residual cold storage time is estimated by measuring the time of the complete cold storage process from high-temperature liquid water to low-temperature solid ice in a laboratory, the residual cold storage time is only related to the total time, however, the temperature in the cold storage box is influenced by external factors such as the ambient temperature besides the refrigerating capacity of the second heat exchanger, and when the ambient temperature is greatly changed, the fluctuation of the water temperature in the cold storage box is large, so that the fluctuation of the cold storage time is large. In view of the above, in the present invention, the remaining cold storage time is calculated according to the total cooling capacity and the cooling power of the air conditioner, and the total cooling capacity is calculated according to the current temperature of the cold storage box. In order to obtain the surplus cold-storage time of cold-storage box this moment promptly, need carry out real-time detection in order to obtain current temperature to the temperature in the cold-storage box, this current temperature itself has synthesized the influence of external factor, consequently according to the surplus cold-storage time that current temperature reachd, has also considered the influence of external factor to make this surplus cold-storage time more accurate.
Referring to fig. 2, in an embodiment, the step of calculating the total cooling capacity required by the cold storage box to decrease from the current temperature to the preset cold storage temperature includes:
in step S21, it is determined that the current temperature is equal to 0 ℃.
Step S22, acquiring a first mass of water in the ice-water mixture in the cold storage tank at the current temperature.
Referring to fig. 3, in this embodiment, the step of obtaining the first mass of water in the ice-water mixture in the cold storage tank at the current temperature includes:
step S221, acquiring a first water level in the cold storage tank at the current temperature;
step S222, determining a first volume of an ice-water mixture in the cold storage tank at the current temperature according to the first water level;
step S223, acquiring a second water level after ice in the cold storage tank is completely melted into water, wherein the second water level is a preset lowest water level;
step S224, determining a second volume of all water after the ice in the cold storage box is completely melted into water according to the second water level;
in this embodiment, a water level sensor 50 is disposed in the cold storage tank, and the water level sensor 50 detects the water level in the cold storage tank to obtain a first water level and a second water level. When the water level is at the preset lowest water level, the ice water in the cold accumulation tank is judged to be completely melted into water, and when the water level is at the preset highest water level, the water in the water tank is judged to be completely condensed into ice. Obviously, the first level of the ice-water mixture is necessarily greater than the second level when it is entirely water, and the resulting first and second volumes are also different. In addition, the first volume is in direct proportion to the first water level, the second volume is in direct proportion to the second water level, and the volume is calculated according to the cross sectional area of the cold accumulation cavity in the cold accumulation box and the water level. It should be noted that since the amount of water in the cold storage tank is substantially unchanged, the second water level and the second volume may be values directly obtained from the total amount of water added when the cold storage tank is filled with water, and similarly, the second mass of the ice-water mixture, i.e., the second mass of the total amount of water, may also be values directly obtained when the cold storage tank is initially filled with water.
Referring to fig. 3 again, in the above, in step S22, the obtaining the first mass of water in the ice-water mixture in the cold storage box at the current temperature further includes:
step S225, calculating the volume fraction of water in the ice water mixture in the cold storage tank at the current temperature according to the first volume and the second volume, wherein the ratio of the first volume to the second volume is in negative correlation with the volume fraction of the water in the ice water mixture;
step S226, calculating a first mass according to the volume fraction of water in the ice-water mixture in the cold storage tank at the current temperature.
Specifically, in step S225, V/V is set according to the formula x +1.1(1-x), specificallywAnd calculating the volume ratio of water to ice in the cold storage tank at the current temperature: x (1-x); wherein x is the volume fraction of water in the ice-water mixture in the cold storage tank at the current temperature, V is the first volume of the ice-water mixture in the cold storage tank at the current temperature, and V iswThe second volume of the whole water after the ice in the cold storage box is completely melted into the water.
In step S226, specifically, according to the formula m ═ x ρ V, the first mass m of water in the ice-water mixture in the cold storage tank at the current temperature is calculated, where ρ is the density of water.
Referring to fig. 2 again, in an embodiment, the step of calculating the total cooling capacity required by the cold storage box to decrease from the current temperature to the preset cold storage temperature further includes:
step S23, calculating a first heat quantity released by ice with the temperature of 0 ℃ formed by water in the cold storage tank at the current temperature according to the first mass and the phase change latent heat of the water with the temperature of 0 ℃, wherein the first heat quantity is in direct proportion to the phase change latent heat of the water with the temperature of 0 ℃ and the first mass respectively.
In particular, according to formula Q1Calculating a first heat quantity Q released by ice in the cold storage box with water being 0 ℃ at the current temperature1Q is the latent heat of phase change of water at 0 DEG CI.e. the latent heat that needs to be released for the conversion of water at 0 c to ice at 0 c.
In one embodiment, the step of calculating the total cooling capacity required by the cold storage box to decrease from the current temperature to the preset cold storage temperature further includes:
and step S24, calculating a second heat quantity released by all the ice falling from 0 ℃ to a preset cold accumulation temperature after all the water in the ice-water mixture in the cold accumulation box at the current temperature is frozen into ice.
Referring to fig. 4, in this embodiment, the step of calculating the second amount of heat released by all the ice falling from 0 ℃ to the preset cold storage temperature after all the water in the ice-water mixture in the cold storage box at the current temperature is frozen (i.e., step S24) further includes:
step S241, acquiring a second mass of the ice-water mixture in the cold storage tank;
step S242, calculating a second heat according to the total mass and the difference value between the current temperature and the preset cold accumulation temperature; the second heat quantity is in direct proportion relation with the second mass, the difference value between the current temperature and the preset cold accumulation temperature.
In particular, according to formula Q2＝ρVwCpi(0-Ts), calculating the heat Q released when all the ice in the cold storage box is frozen and all the ice is reduced to the preset cold storage temperature Ts from 0 DEG C2(ii) a Wherein, CpiThe specific heat capacity of ice.
Referring to fig. 2 again, in an embodiment, the step of calculating the total cooling capacity required by the cold storage box to decrease from the current temperature to the preset cold storage temperature further includes:
and step S25, calculating the total refrigerating capacity required by the cold storage box to be decreased from the current temperature to the preset cold storage temperature according to the first heat and the second heat, wherein the total refrigerating capacity is positively correlated with the first heat and the second heat respectively.
In particular, Q is given by the formula1+Q2And calculating the refrigerating capacity Q required by the cold storage box to be reduced from the current temperature T to the preset cold storage temperature Ts.
Referring to fig. 5, in an embodiment, the step of calculating the total cooling capacity required by the cold storage box to decrease from the current temperature to the preset cold storage temperature further includes:
step S261, determining that the current temperature is greater than 0 ℃;
step S262, acquiring a second mass of all water after all ice cubes in the cold storage box are completely melted into water;
in step S262, the second mass is obtained directly from the amount of water added.
And step S263, calculating a third heat quantity released by the cold storage tank from the current temperature to 0 ℃ according to the second mass, the difference value between the current temperature and 0 ℃ and the specific heat capacity of water, wherein the third heat quantity is in direct proportion to the second mass, the difference value between the current temperature and 0 ℃ and the specific heat capacity of water respectively.
In particular, according to formula Q3＝MCpw(T-0) calculating the third heat Q released by the cold storage box when the current temperature T is reduced to 0 DEG C3And M is the second mass.
And step S264, calculating a fourth heat released by the cold storage box from 0 ℃ to the preset cold storage temperature according to the second mass, the difference value between 0 ℃ and the preset cold storage temperature and the specific heat capacity of the ice, wherein the fourth heat is in direct proportion to the second mass, the difference value between 0 ℃ and the preset cold storage temperature and the specific heat capacity of the ice.
In particular, according to formula Q4＝M Cpi(0-Ts), calculating the fourth heat Q released by the cold storage box from 0 ℃ to the preset cold storage temperature Ts4，CpiThe specific heat capacity of ice.
Step S265, calculating a fifth amount of heat released by all water at 0 ℃ converted into ice according to the second mass and the latent heat of phase change of the water at 0 ℃, wherein the fifth amount of heat is in direct proportion to the second mass and the latent heat of phase change of the water at 0 ℃.
In particular, according to formula Q5The fifth heat released by all water to ice at 0 ℃ was calculated M q.
And step S266, calculating the total refrigerating capacity required by the cold storage box to reduce the current temperature to the preset cold storage temperature according to the third heat, the fourth heat and the fifth heat, wherein the total refrigerating capacity is positively correlated with the third heat, the fourth heat and the fifth heat respectively.
According to the formula Q ═ Q3+Q4+Q5And calculating the refrigerating capacity Q required by the cold storage box to be reduced from the current temperature T to the preset cold storage temperature Ts.
Referring to fig. 6, in an embodiment, the step of calculating the total cooling capacity required by the cold storage box to decrease from the current temperature to the preset cold storage temperature further includes:
step S271, determining that the current temperature is less than 0 ℃;
step S272, acquiring the second mass of all water after all ice cubes in the cold storage box are completely melted into water;
step S273, calculating the total refrigerating capacity required by the cold storage box from the current temperature to the preset cold storage temperature according to the second mass, the difference value between 0 ℃ and the preset cold storage temperature and the specific heat capacity of ice;
wherein, the total refrigerating capacity is in direct proportion relation with the second mass, the difference between 0 ℃ and the preset cold accumulation temperature and the specific heat capacity of the ice.
In particular, according to the formula Q ═ MCpi(0-Ts), calculating the refrigerating capacity Q required by the cold storage box to drop from the current temperature T to the preset cold storage temperature Ts.
In the invention, the temperature in the cold storage box is detected in real time and is divided into three sections: the calculation methods of the residual cold accumulation time are different in different temperature ranges of more than 0 ℃, equal to or less than 0 ℃ and less than 0 ℃. In the detection process, the corresponding control method is switched according to the stage of the current temperature, so that the residual cold accumulation time can be more accurately obtained, and the influence of external factors such as the ambient temperature and the refrigeration efficiency on the obtaining of the residual cold accumulation time is avoided.
The scheme can predict the residual cold storage time, has relatively small error, and is not influenced by the state in the cold storage box, namely the cold storage time can be predicted no matter what state the water in the cold storage box starts to store cold. In addition, the cold accumulation time is predicted under the influence of the refrigerating capacity of the refrigerating system besides the residual required cold accumulation amount, and the two factors are combined together, so that the prediction result of the residual cold accumulation time can be adjusted in a short time even if the refrigerating condition of the refrigerating system is changed.
The invention also proposes an air conditioner further comprising a memory, a processor and a computer program stored on said memory and executable on said processor, said computer program implementing the steps of the method as described above when executed by said processor.
Referring to fig. 7, in an embodiment of the present invention, an air conditioner includes:
the cold accumulation loop comprises a compressor 11, a first heat exchanger 12, a second heat exchanger 13 and a first pipe 14, wherein the first pipe 14 is sequentially connected with an output port of the compressor 11, the first heat exchanger 12, the second heat exchanger 13 and a suction port of the compressor 11;
a first cool sending loop comprising a cool sending heat exchanger 22, wherein the cool sending heat exchanger 22 is used for transmitting the energy of the second heat exchanger 13 to the indoor; and
and a second cooling circuit including a second pipe 31 and a third heat exchanger 32 provided in the second pipe 31, wherein the second pipe 31 has a first end 311 and a second end 312, the first end 311 and the second end 312 are connected to the first pipe 14, and the first end 311 and the second end 312 are connected to a pipeline between the compressor 11 and the second heat exchanger 13.
In one embodiment, the first cold sending loop further includes a cold taking heat exchanger 21 and a water pump 23, and the cold taking heat exchanger 21, the water pump 23 and the cold sending heat exchanger 22 are sequentially connected to form a closed loop. Wherein, the cold taking heat exchanger 21 exchanges heat with the second heat exchanger 13, and transmits the cold energy obtained by the exchange to the cold sending heat exchanger 22, and the cold sending heat exchanger 22 transmits the cold energy to the indoor. The first cold conveying loop comprises a cold conveying pipeline which is connected with the cold taking heat exchanger 21, the water pump 23 and the cold conveying heat exchanger 22, and the cold conveying pipeline is filled with heat exchange liquid, such as water or ethanol and the like, so that the heat exchange liquid continuously circulates under the action of the water pump 23 and the cold of the second heat exchanger 13 is continuously conveyed to the cold conveying heat exchanger 22. In this embodiment, the cold heat exchanger 21 and the cold heat exchanger 22 are fin-tube heat exchangers, light-tube heat exchangers, or plate heat exchangers.
Referring to fig. 8, the air conditioner further includes a cold storage box 40, and the second heat exchanger 13 and the cold taking heat exchanger 21 are both disposed in the cold storage box 40. In the present embodiment, the cold storage tank 40 is a structure having a cold storage chamber 41, and the cold storage chamber 41 is filled with a cold storage liquid, specifically, water, ethylene glycol, or the like. The second heat exchanger 13 and the cold taking heat exchanger 21 are both soaked in the cold accumulation liquid, the second heat exchanger 13 refrigerates or heats the cold accumulation liquid, and the cold accumulation liquid transmits cold energy to the cold taking heat exchanger 21. In addition, in other embodiments, a phase change material may be further disposed in the cold storage box 40. The cold storage chamber 41 is a sealed chamber, so that the liquid, such as water, in the cold storage chamber 41 can be prevented from flowing out during transportation or during operation. Specifically, a sealant or a sealing strip or a sealing ring may be disposed between the components of the cold storage box 40 constituting the cold storage chamber 41 for sealing. Further, a water level sensor 50 may be provided on the cool storage box 40, and at least a detection head of the water level sensor 50 is inserted into the cool storage chamber 41 to detect a water level in the cool storage chamber 41.
In this embodiment, the second heat exchanger 13 and the cooling heat exchanger 21 may be arranged at intervals, or the second heat exchanger 13 and the cooling heat exchanger 21 are arranged alternately, for example, a heat exchange tube of the cooling heat exchanger 21 is sandwiched between two heat exchange tubes of the second heat exchanger 13. Likewise, the second heat exchanger 13 and the cold heat exchanger 21 are in the form of finned tube heat exchangers, light pipe heat exchangers or plate heat exchangers, etc.
Specifically, in the cooling mode, the first heat exchanger 12 functions as a condenser, and the second heat exchanger 13 functions as an evaporator. The refrigerant discharged from the output port of the compressor 11 passes through the first heat exchanger 12, the throttling element 15 and the second heat exchanger 13 in sequence and then flows back to the suction port of the compressor 11. Since the first pipe 14 is also connected in parallel with a second cooling circuit, when the second cooling circuit is opened, the refrigerant flows out of the second heat exchanger 13 and then is divided into two flows, one flow of refrigerant flows to the suction port of the compressor 11 from the first pipe 14 between the second heat exchanger 13 and the compressor 11, and the other flow of refrigerant flows through the second cooling circuit and flows back to the suction port of the compressor 11 through the second pipe 31 and the third heat exchanger 32. In this process, the second heat exchanger 13 refrigerates the cold storage liquid in the cold storage tank 40, so that the cold storage liquid stores a large amount of cold, for example, the cold storage liquid can freeze. When a large amount of cold is not accumulated in the cold storage box 40 (for example, when the air conditioner is turned on, the ice in the cold storage box 40 is insufficient or the ice in the cold storage box 40 is used up during the operation of the air conditioner), the temperature of the refrigerant in the first cold supply circuit that is cooled by the cold storage box 40 is high, and the effect of the cold supply heat exchanger 22 on the first cold supply circuit on cooling the indoor space is poor. In view of this problem, in the embodiment of the present invention, in the cooling mode, since part of the refrigerant is distributed to the second cooling circuit, the third heat exchanger 32 of the second cooling circuit can cool the room to decrease the room temperature, so that the problem of cool air supply due to the fact that a large amount of cooling energy is not accumulated in the cold storage box 40 can be solved, and the user experience is improved.
In the cooling mode, the refrigerant first stores cold in the second heat exchanger 13 and then enters the third heat exchanger 32 to send cold, so as to achieve the purpose of storing cold and sending cold simultaneously. The arrows in fig. 7 indicate the flow direction of the refrigerant in the cooling mode.
In one embodiment, the cold storage loop further comprises a mixing device 17, wherein the mixing device 17 is provided with a mixing cavity 171, and a first connecting port 172, a second connecting port 173 and a third connecting port 174 which are communicated with the mixing cavity 171; the first connection port 172 communicates with the first pipe 14, the second connection port 173 communicates with the second end 312, and the third connection port 174 communicates with a suction port of the compressor 11. Optionally, the mixing device 17 comprises a mixing tank having the first connection port 172, the second connection port 173 and the third connection port 174. Of course, the mixing device 17 may have a tubular structure, a cylindrical structure, or the like.
In the cooling mode, the refrigerant passes through the compressor 11 and then becomes high-temperature high-pressure gas, after heat exchange is performed by the first heat exchanger 12, the refrigerant becomes high-temperature high-pressure liquid at the outlet of the first heat exchanger 12, and the refrigerant liquid is depressurized and cooled by the throttling element 15 arranged on the first piping 14 and then becomes low-temperature low-pressure gas-liquid mixture. Then the refrigerant exchanges heat in the second heat exchanger 13 to perform a cold storage process. When the refrigerant is still in the low-temperature gas-liquid two-phase region, the refrigerant flows out of the second heat exchanger 13 and is then divided into two paths through the three-way valve 16, one path enters the second piping 31, and the refrigerant continuously exchanges heat through the cold-sending heat exchanger, transfers cold energy to air and becomes medium-temperature superheated gas. The refrigerant in the superheated state coming out of the cooling heat exchanger and the non-superheated refrigerant flowing out of the other path of the three-way valve 16 are changed into a low-temperature and low-pressure superheated gas in the mixing device 17 and then enter the compressor 11 to be compressed, thereby completing one cycle. The mixing device 17 is arranged so that the two refrigerants can be mixed with each other and it is ensured that the refrigerant flowing from the mixing device 17 to the compressor 11 is in a gaseous state.
In order to control the on/off of the second pipe 31, in an embodiment, the first pipe 14 has a branch point connected to the first end 311, and the second end 312 is connected to a pipeline between the branch point and the compressor 11. The diversion point is provided with a three-way valve 16, the first end 311 is communicated with the first pipe 14 through the three-way valve 16, the three-way valve 16 can conduct the first pipe 14 and the second pipe 31, and/or the three-way valve 16 can conduct the first pipe 14 and the compressor 11. After the three-way valve 16 is arranged, the on-off of different openings of the three-way valve 16 can be controlled, and the conduction of each pipeline is realized. For example, when it is necessary to cool the room and it is detected that the cold storage amount in the cold storage tank 40 is insufficient, the compressor 11 is turned on and the first pipe 14 and the second pipe 31 are connected so that the refrigerant is cooled by the second heat exchanger 13 to the cold storage tank 40 and the refrigerant is cooled by the third heat exchanger 32 to the room. In this process, the three-way valve 16 can disconnect the first pipe 14 from the compressor 11, and the entire refrigerant flowing out of the second heat exchanger 13 can flow to the second pipe 31, thereby improving the cooling effect on the room. Of course, the three-way valve 16 can simultaneously conduct the first pipe 14 and the second pipe 31, and the first pipe 14 and the compressor 11, so that part of the refrigerant flowing out of the second heat exchanger 13 flows to the second pipe 31, and the other part flows directly to the mixing device 17. If the indoor cooling is not necessary and only the cold storage is performed, the second pipe 31 and the first pipe 14 are disconnected from each other, and at this time, all the refrigerant flowing out of the second heat exchanger 13 flows directly to the mixing device 17.
In other embodiments, the air conditioner may not include the second cooling circuit. Alternatively, the third heat exchanger may also be arranged in parallel or in series with the second heat exchanger.
In the aforesaid, when carrying out the cold-storage to the cold-storage tank (the compressor is opened promptly, and the second send the cold return circuit to open or close according to the condition, and the water pump in the first send the cold return circuit is closed), can calculate according to the temperature in the cold-storage tank and draw surplus cold-storage time to judge that the cold-storage tank still needs how long time just can hold cold volume fully.
The present invention also proposes a computer readable storage medium having stored thereon an air conditioner processing program which, when executed by a controller, implements the steps of the method for predicting remaining cold storage time as described above.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The method for predicting the residual cold accumulation time is characterized in that the method for predicting the residual cold accumulation time is used for an air conditioner, the air conditioner comprises a cold accumulation loop and a cold accumulation box, the cold accumulation loop comprises a compressor, a first heat exchanger and a second heat exchanger which are sequentially connected, and the second heat exchanger is positioned in the cold accumulation box;
the method for predicting the residual cold storage time comprises the following steps:
acquiring the current temperature of the cold storage box;
calculating the total refrigerating capacity required by the cold storage box when the current temperature is reduced to the preset cold storage temperature;
and calculating the residual cold accumulation time according to the total refrigerating capacity and the refrigerating power of the air conditioner, wherein the residual cold accumulation time is in a positive proportional relation with the total refrigerating capacity, and the residual cold accumulation time is also in a negative proportional relation with the refrigerating power.
2. The method for predicting remaining cool storage time according to claim 1, wherein the step of calculating the total cooling capacity required for the cool storage box to drop from the current temperature to the preset cool storage temperature comprises:
determining that the current temperature is equal to 0 ℃;
acquiring a first mass of water in an ice-water mixture in a cold storage tank at a current temperature;
calculating first heat released by ice at the temperature of 0 ℃ formed by water in the cold storage tank at the current temperature according to the first mass and the phase change latent heat of the water at the temperature of 0 ℃, wherein the first heat is in direct proportion to the phase change latent heat of the water at the temperature of 0 ℃ and the first mass respectively;
calculating a second heat quantity released when all the ice in the ice-water mixture in the cold storage box is frozen at the current temperature and all the ice is reduced to the preset cold storage temperature from 0 ℃;
and calculating the total refrigerating capacity required by the cold storage box to be reduced from the current temperature to the preset cold storage temperature according to the first heat and the second heat, wherein the total refrigerating capacity is positively correlated with the first heat and the second heat respectively.
3. The method for predicting remaining cold storage time according to claim 2, wherein the step of obtaining the first mass of water in the ice-water mixture in the cold storage tank at the current temperature comprises:
acquiring a first water level in a cold storage tank at a current temperature;
determining a first volume of an ice-water mixture in the cold storage tank at the current temperature according to the first water level;
acquiring a second water level after ice in the cold storage tank is completely melted into water, wherein the second water level is a preset lowest water level;
determining a second volume of all water after the ice in the cold storage box is completely melted into water according to the second water level;
calculating the volume fraction of water in the ice-water mixture in the cold storage tank at the current temperature according to the first volume and the second volume, wherein the ratio of the first volume to the second volume is in negative correlation with the volume fraction of the water in the ice-water mixture;
and calculating the first mass according to the volume fraction of water in the ice-water mixture in the cold storage tank at the current temperature.
4. The method for predicting remaining cool storage time according to claim 2 or 3, wherein the step of calculating the second amount of heat released when all the ice drops from 0 ℃ to the preset cool storage temperature after all the water in the ice-water mixture in the cool storage tank at the current temperature is frozen further comprises:
acquiring a second mass of the ice-water mixture in the cold storage box;
calculating a second heat according to the total mass and the difference value between the current temperature and the preset cold accumulation temperature;
the second heat quantity is in direct proportion relation with the second mass, the difference value between the current temperature and the preset cold accumulation temperature.
5. The method for predicting remaining cool storage time according to claim 1, wherein the step of calculating the total cooling capacity required for the cool storage box to drop from the current temperature to the preset cool storage temperature further comprises:
determining that the current temperature is greater than 0 ℃;
acquiring the second mass of all water after all ice cubes in the cold storage box are completely melted into water;
calculating a third heat quantity released by the cold storage box from the current temperature to 0 ℃ according to the second mass, the difference value between the current temperature and 0 ℃ and the specific heat capacity of water, wherein the third heat quantity is in direct proportion to the second mass, the difference value between the current temperature and 0 ℃ and the specific heat capacity of water respectively;
according to the second mass, the difference value between 0 ℃ and the preset cold accumulation temperature and the specific heat capacity of the ice, calculating fourth heat released by the cold accumulation box when the temperature of the cold accumulation box is reduced from 0 ℃ to the preset cold accumulation temperature, wherein the fourth heat is in direct proportion to the second mass, the difference value between 0 ℃ and the preset cold accumulation temperature and the specific heat capacity of the ice;
calculating fifth heat released by all water converted into ice at the temperature of 0 ℃ according to the second mass and the phase change latent heat of the water at the temperature of 0 ℃, wherein the fifth heat is in direct proportion to the second mass and the phase change latent heat of the water at the temperature of 0 ℃;
and calculating the total refrigerating capacity required by the cold storage box to be reduced from the current temperature to the preset cold storage temperature according to the third heat, the fourth heat and the fifth heat, wherein the total refrigerating capacity is in positive correlation with the third heat, the fourth heat and the fifth heat respectively.
6. The method for predicting remaining cool storage time according to claim 1, wherein the step of calculating the total cooling capacity required for the cool storage box to drop from the current temperature to the preset cool storage temperature further comprises:
determining that the current temperature is less than 0 ℃;
acquiring the second mass of all water after all ice cubes in the cold storage box are completely melted into water;
calculating the total refrigerating capacity required by the cold storage box from the current temperature to the preset cold storage temperature according to the second mass, the difference value between 0 ℃ and the preset cold storage temperature and the specific heat capacity of the ice;
wherein, the total refrigerating capacity is in direct proportion relation with the second mass, the difference between 0 ℃ and the preset cold accumulation temperature and the specific heat capacity of the ice.
7. The method for predicting remaining cool storage time according to claim 1, wherein the cooling power of the air conditioner is calculated from an ambient temperature and a power of a compressor.
8. An air conditioner is characterized by comprising a cold accumulation loop and a cold accumulation box, wherein the cold accumulation loop comprises a compressor, a first heat exchanger and a second heat exchanger which are sequentially connected, the cold accumulation box is provided with a closed cold accumulation cavity, and the second heat exchanger is positioned in the cold accumulation cavity;
the air conditioner further comprises a memory, a processor and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the method according to any one of claims 1 to 7.
9. The air conditioner of claim 8, wherein the cold accumulation circuit further comprises a first piping, the first piping connecting an output port of the compressor, the first heat exchanger, the second heat exchanger, and a suction port of the compressor in this order;
the air conditioner further includes:
the first cold conveying loop comprises a cold conveying heat exchanger, a cold taking heat exchanger and a water pump, the cold taking heat exchanger, the water pump and the cold conveying heat exchanger are sequentially connected, and the second heat exchanger and the cold taking heat exchanger are arranged in the cold storage box; and the number of the first and second groups,
a second cold feed loop including a second piping and a third heat exchanger disposed on the second piping, the second piping having a first end and a second end, the first end and the second end being connected to the first piping, and the first end and the second end being connected to a piping between the compressor and the second heat exchanger.
10. A computer-readable storage medium, characterized in that an air conditioner processing program is stored thereon, which when executed by a controller implements the steps of the method for predicting remaining cool storage time according to any one of claims 1 to 7.
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| CN201911212083.XA CN112880073A (en) | 2019-11-29 | 2019-11-29 | Air conditioner, method for predicting remaining cold storage time, and computer-readable storage medium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114475407A (en) * | 2022-04-01 | 2022-05-13 | 济南锦润技术开发有限公司 | Energy-storage type constant-temperature cold chain box |
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