CN111256427B - Method and system for judging refrigerant leakage of ship-based refrigeration device - Google Patents
Method and system for judging refrigerant leakage of ship-based refrigeration device Download PDFInfo
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- 239000003507 refrigerant Substances 0.000 title claims abstract description 109
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000005057 refrigeration Methods 0.000 title claims description 32
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- 230000001502 supplementing effect Effects 0.000 claims description 5
- 238000009826 distribution Methods 0.000 claims description 4
- 238000001704 evaporation Methods 0.000 description 7
- 230000008020 evaporation Effects 0.000 description 7
- 230000006870 function Effects 0.000 description 7
- 238000003860 storage Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000005494 condensation Effects 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 230000002354 daily effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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- 239000013535 sea water Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2500/00—Problems to be solved
- F25D2500/06—Stock management
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2600/00—Control issues
- F25D2600/06—Controlling according to a predetermined profile
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Abstract
The invention belongs to the technical field of ship-based refrigerating devices, and particularly relates to a method and a system for judging refrigerant leakage of a ship-based refrigerating device, wherein the method for judging refrigerant leakage of the ship-based refrigerating device comprises the following steps: collecting a concentration value of a refrigerant between devices; calculating an average concentration according to the concentration value of the refrigerant between the devices; and whether the refrigerant leaks or not is judged according to the average concentration, so that whether the refrigerant leaks or not on the ship is accurately and reliably judged.
Description
Technical Field
The invention belongs to the technical field of ship refrigeration devices, and particularly relates to a method and a system for judging refrigerant leakage of a ship refrigeration device.
Background
At present, a refrigeration system for ships does not have a refrigerant leakage detection and judgment system integrated with equipment, and refrigerant leakage can be found only when evaporation pressure and condensation pressure are reduced or a refrigeration effect cannot be achieved in daily routing inspection. Further, it is impossible to determine whether the refrigerant discharge is within a reasonable range or the leakage is suddenly increased, and countermeasures are required.
Most of the refrigeration systems for ships are direct evaporation systems, and the pressure conditions of low pressure and high pressure can be checked only through daily equipment inspection, so that whether leakage exists or not is preliminarily judged. However, this situation is not accurate on ships, for example, when a ship travels from a hot sea area to a sea area with a low temperature, the load changes due to the changes of the external working conditions will also have the same changes, i.e., the evaporation pressure, the refrigeration pressure will be low, the refrigeration capacity will be small, the temperature of the warehouse will be normal, but the actual system may start to leak, which may cause an artifact to the equipment management.
The refrigeration unit for the ship has the evaporation temperature of about minus 25 ℃, is a direct expansion system, has long pipelines, is limited by the construction conditions on the ship, and is difficult to be installed cleanly as on land. The expansion valve on the ship refrigeration is relatively easy to form ice blockage.
In addition, the compressor for the ship is a multi-cylinder piston compressor, and in the compressor of the type, a small amount of lubricating oil seeps outwards under normal conditions, so that refrigerant contained in the oil is difficult to distinguish whether the normal condition or the new emergency condition occurs and leakage occurs by managers. The refrigerant will have some normal attenuation, and it is a problem how to define the daily attenuation or sudden leakage (such as breakage caused by vibration, aging of the connector, damage).
| Pressure of evaporation | Condensing pressure | |
| Refrigerant leakage | Reduce | Reduce |
| Ship driving direction low-temperature sea area | Reduce | Reduce |
| Ice block of expansion valve | Reduce | Reduce |
| Normal refrigerant attenuation in direct expansion system | Reduce | Reduce |
| When multi-cylinder piston compressor is unloaded | Reduce | Reduce |
As can be seen from the above table, the refrigerant leakage is only one of the reasons for the decrease in the evaporation pressure and the condensation pressure. The traditional method is mainly used for judging whether the refrigerant leaks or not by judging the pressure of the evaporator and the pressure of the condenser to be lower, but the method is limited in the aspects of ship refrigeration and air conditioning, and can be influenced by factors such as weather influence, load change, ice blockage and the like in the sea area, so that misjudgment can be caused.
Therefore, in view of the above technical problems, it is desirable to design a new method and system for determining refrigerant leakage in a refrigeration device for a ship.
Disclosure of Invention
The invention aims to provide a method and a system for judging the refrigerant leakage of a refrigeration device for a ship.
In order to solve the technical problem, the invention provides a method for judging the refrigerant leakage of a refrigeration device for a ship, which comprises the following steps:
collecting a concentration value of a refrigerant between devices;
calculating an average concentration according to the concentration value of the refrigerant between the devices; and
and judging whether the refrigerant leaks or not according to the average concentration.
Further, the method for collecting the refrigerant concentration between the devices comprises the following steps:
when the equipment works normally, the concentration value of the refrigerant between the equipment is detected, and m effective concentration output values before the current moment are sequentially acquired, namely
And sequentially collecting a plurality of inter-equipment refrigerant concentration values, and eliminating invalid values in the inter-equipment refrigerant concentration values according to the distribution diagram so as to collect m effective concentration output values.
Further, the method of calculating an average concentration from the inter-apparatus refrigerant concentration value includes:
acquiring the concentration range of the refrigerant in the environment when the equipment normally operates according to the m effective concentration output values, and calculating the average concentration;
the method for calculating the average concentration comprises the following steps:
wherein，d0Is the average concentration; m is the number of effective concentration output values; d0aIs the a-th effective concentration output value.
Further, the method of determining whether the refrigerant leaks according to the average concentration includes:
when d isc＜k*d0Judging safety, not sending out alarm signal, and removing d01And applying the current concentration dcSequentially supplementing effective concentration output values, updating the average concentration, and judging whether the concentration at the next moment is safe or not according to the updated average concentration;
when d isc＞k*d0Judging that the operation is unsafe, not sending an alarm signal, and recording the continuous unsafe times n;
judging the refrigerant leakage when the continuous unsafe times N reach the preset times N, and giving an alarm;
wherein k is the maximum concentration allowable value dmaxAnd the average concentration d0The coefficient of variation of (a) is,
dcc is a non-0 natural number; n is a preset number of times, N belongs to [ N ∈ [ ]min,Nmax]，NminNumber of times corresponding to minimum value of interference time for ignoring outside concentration, NmaxThe number of times corresponds to the maximum value of the interference time in which the external concentration is ignored.
On the other hand, the invention also provides a system for judging the refrigerant leakage of the refrigeration device for the ship, which comprises the following components:
the control module is a concentration sensor electrically connected with the control module;
the concentration sensor is suitable for detecting the concentration value of the refrigerant between the devices and sending the concentration value to the control module;
the control module is adapted to determine whether refrigerant leaks based on the inter-device refrigerant concentration value.
Further, the control module is suitable for judging whether the refrigerant leaks or not by adopting the method for judging the refrigerant leakage of the marine refrigeration device.
The invention has the beneficial effects that the concentration value of the refrigerant between the devices is collected; calculating an average concentration according to the concentration value of the refrigerant between the devices; and whether the refrigerant leaks or not is judged according to the average concentration, so that whether the refrigerant leaks or not on the ship is accurately and reliably judged.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of a method for determining refrigerant leakage in a refrigeration device for a ship according to the present invention;
FIG. 2 is a refrigerant concentration dynamic graph in accordance with the present invention;
fig. 3 is a flowchart of a method of determining whether a refrigerant leaks according to the present invention;
fig. 4 is a schematic block diagram of a refrigerant leakage determination system of the refrigeration apparatus for a ship according to the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Fig. 1 is a flowchart of a method for determining refrigerant leakage in a refrigeration apparatus for a ship according to the present invention.
As shown in fig. 1, embodiment 1 provides a method for determining refrigerant leakage in a refrigeration device for a ship, including: collecting a concentration value of a refrigerant between devices; calculating an average concentration according to the concentration value of the refrigerant between the devices; and whether the refrigerant leaks or not is judged according to the average concentration, so that whether the refrigerant (refrigerant) on the ship leaks or not is accurately and reliably judged, and the misjudgment caused by the influences of factors such as weather influence, load change, ice blockage and the like of a sea area, which is caused by judging whether the refrigerant leaks or not by judging whether the pressure of an evaporator and the pressure of a condenser are lower in the traditional method, is avoided.
Fig. 2 is a refrigerant concentration dynamic diagram according to the present invention.
As shown in fig. 2, in this embodiment, the method for acquiring the refrigerant concentration between the devices includes: when equipment (refrigeration equipment) normally works, detecting the concentration value of the refrigerant between the equipment (storing and recording the concentration value of the refrigerant between the equipment), sequentially acquiring m (1000, for example, can be set according to requirements) effective concentration output values before the current moment, namely sequentially acquiring a plurality of the concentration values of the refrigerant between the equipment, eliminating invalid values in the concentration values of the refrigerant between the equipment according to a distribution diagram, and acquiring m effective concentration output values (m effective concentration output values nearest to the current moment); the method selects the latest m (for example 1000) concentrations to avoid the concentration of an equipment space from being influenced by temperature, and in the sailing process of a ship, the load and the working condition of cooling water can be changed along with the change of external temperature, the system pressure can be changed, and the environmental concentration of the equipment can be correspondingly changed (for example, the equipment is driven to a sea area with hot weather, the peripheral load of a cold storage is increased, the temperature of seawater is increased, the temperature of the cooling water is increased, the evaporation pressure and the condensation pressure are increased, the quantity of refrigerants carried by oil leakage of a piston compressor is different, and the environmental concentration of the equipment is changed again).
In this embodiment, the method of calculating an average concentration from an inter-apparatus refrigerant concentration value includes: acquiring the concentration range of the ambient refrigerant in the normal operation of the equipment according to the m effective concentration output values (obtaining the concentration range of the refrigerant in the normal operation of the equipment, such as 0-500ppm, according to the net distribution state of the m effective concentration output values), and calculating the average concentration;
the method for calculating the average concentration comprises the following steps:
wherein d is0Is the average concentration; m is the number of effective concentration output values; d0aThe a-th effective concentration output value in the array formed by the m effective concentration output values; the cold storage for ships is mostly direct expansion system, and equipment part is many, and the compressor is mostly piston compressor, has certain normal refrigerant (refrigerant) concentration value between the equipment, needs to distinguish whether normal concentration value or unusual concentration value between the equipment, avoids the production of error.
Fig. 3 is a flowchart of a method of determining whether refrigerant leaks according to the present invention.
As shown in fig. 3, in the present embodiment, the method for determining whether the refrigerant leaks according to the average concentration includes: when d isc＜k*d0Judging safety, not sending out alarm signal, and removing d01And applying the current concentration dcSequentially supplementing effective concentration output values (supplementing a number series consisting of the effective concentration output values to ensure that the number series contains m effective concentration output values), updating the average concentration, and judging whether the concentration at the next moment is safe according to the updated average concentration; when d isc＞k*d0Judging that the operation is unsafe, not sending an alarm signal, and recording the continuous unsafe times n;judging refrigerant leakage when the continuous unsafe times N reach or exceed the preset times N, and giving an alarm, wherein in specific items, the N value of each item is determined according to the past experience and the layout condition among specific item devices, and can be corrected in the debugging and using processes;
wherein d is01For the first value of the array currently containing m effective concentration output values, i.e. the m effective concentration output values in the array are arranged in sequence, d01Outputting the value of the effective concentration with the longest time from the current time; k is the maximum concentration allowable value dmaxAnd the average concentration d0The coefficient of variation of (a) is,
dcc is a non-0 natural number; n is a preset number of times, N belongs to [ N ∈ [ ]min,Nmax]，NminNumber of times corresponding to minimum value of interference time for ignoring outside concentration, NmaxFor ignoring the number of times corresponding to the maximum value of the interference time of the external concentration, for example, the interference time is 1-10 minutes, if the value period of the control system is 20 seconds, N ismin60/20/3, Nmax600 sec/20 sec 30 times, i.e. N e [3,30 ∈]；
Specifically, d is satisfied at the current concentration1＜k*d0Judging safety, not sending out alarm signal, and removing d01And applying the current concentration d1Sequentially supplementing effective concentration output values, updating average concentration, and judging whether the concentration at the next moment is safe or not according to the updated average concentration, wherein the new average concentration is
When a is 2.., m;
satisfies d at the current concentration2＞k*d0(at this time d0Is updated average concentration), judging unsafe, not sending out alarm signal, recording continuous unsafe times n as 1, d2Values were not calculated for new mean concentrations;
satisfies d at the current concentration3＞k*d0(at this time d0Average concentration adopted when judging whether the safety is ensured or not at the last moment), judging that the safety is ensured, not sending out an alarm signal, but recording the continuous unsafe times n to be 2 times, d3Values were not calculated for new mean concentrations; sequentially judging the current concentrations;
the current concentration continuously reaches or exceeds a safe concentration value k x d0When the number of times reaches a preset number of times, namely the number of times of continuous unsafe reaches or exceeds a preset number of times N (N is more than or equal to N), judging that the refrigerant leaks and giving an alarm; the time delay alarm function is realized by setting the preset time N (namely, the time delay time), the problems that other external sudden factors cause concentration change or are not equipment can be prevented, and the like, the condition that the temporary interference by the external factors is eliminated, and the accuracy of leakage judgment is ensured; the leakage amount of the refrigerant can be calculated by utilizing the detected concentration and knowing the size of the installation space of the equipment, so that conditions are created for quantitative management of the leakage amount of the refrigerant, and technical reserve is provided for annual quantitative index management of the leakage amount of the refrigerant of future ship refrigeration and air conditioning equipment.
In the embodiment, the concentration between the devices is continuously recorded, the data is stored, a reasonable value of the concentration is judged according to the existing data and continuously increased new data, and if the current concentration is detected to exceed the former reasonable value, a delay alarm function is set (avoiding misoperation or influence of other activities, and setting time delay of 2-60 times); and the alarm concentration of different concentrations can be selected according to the size of the installation space of the refrigeration equipment.
In this embodiment, to collect 1000 effective concentration output values, the average concentration d0250ppm, and a maximum effective interval of 500ppm (the concentration range of the refrigerant in the environment where the apparatus normally operates is 0-500ppm), and the maximum allowable concentration value dmaxAnd the average concentration d0The fluctuation coefficient k is 500/250 is 2;
the current concentration is d1400ppm, 400ppm<2 x 250ppm, judging safety, not sending out alarm signal, and removing d01And applying the current concentration d1Sequential supplementation of effective concentration infusionTaking out the value, updating the average concentration, the new average concentration being
When a is 2, i.m., the new average concentration is d0＝250.3ppm；
The current concentration is d2800ppm if 800ppm>2, 250.3, judging unsafe, not sending out alarm signal, but recording continuous unsafe times n as 1, d2Values were not calculated for new mean concentrations;
the current concentration is d3750ppm, then 750ppm>2, 250.3, judging unsafe, not sending out alarm signal, and recording the continuous unsafe times n-2 times, d3Values were not calculated for new mean concentrations; sequentially judging the current concentrations;
if the value cycle of the project control system is 20 seconds, the time for neglecting the outside concentration is determined to be 2 minutes, the value of the project N is 120 seconds/20 seconds or 6 times, namely when the continuous unsafe times reach or exceed 6 times, the refrigerant leakage is judged and an alarm is sent out (a PLC control system on the equipment sends out an alarm signal to control an alarm device to send out an alarm);
according to the current concentration value, the known volume between equipment is input, the annual or monthly refrigerant leakage value can be calculated through the accumulated calculation of time, conditions are created for quantitative index management of refrigerant leakage, whether measures are taken in advance or not is pre-judged according to the requirement of a task, and the requirement of a naval navigation task of an army is guaranteed.
Example 2
Fig. 4 is a schematic block diagram of a refrigerant leakage determination system of the refrigeration apparatus for a ship according to the present invention.
As shown in fig. 4, in addition to embodiment 1, embodiment 2 further provides a system for determining refrigerant leakage in a refrigeration device for a ship, including: the control module is a concentration sensor electrically connected with the control module; the control module can be but is not limited to a PLC module; the concentration sensor is suitable for detecting the concentration value of the refrigerant between the devices and sending the concentration value to the control module; the control module is suitable for judging whether the refrigerant leaks according to the concentration value of the refrigerant between the devices; can choose for use one kind to survey gas concentration detection's device, can directly install this kind of device on marine refrigerated equipment, and current equipment is integrated as an organic whole to from taking concentration sensor, refrigerant leak testing is integrated as an organic whole with refrigeration plant itself, and is with low costs, and operation management is convenient, and can integrate in the control system of equipment itself, control system integration, and can be according to this principle, in the control of conventional classical relay in the last application of simplifying.
In this embodiment, the control module is adapted to determine whether the refrigerant leaks by using the method for determining refrigerant leakage in the refrigeration apparatus for a ship according to embodiment 1.
In the embodiment, the control module records the concentration between devices every day, stores the data, judges a reasonable value of the concentration according to the existing data and new data which are continuously added, and sets a delay alarm function (the time delay of 2-60 times can be set to avoid misoperation or other activities if the current concentration is detected to exceed the former reasonable value).
In this embodiment, under the condition of non-PLC module control, such as a conventional classical electric appliance controlled ship refrigeration device, a safe concentration value and a continuous unsafe number for triggering an alarm can be set by itself, an on-site alarm and an alarm signal output are realized, and the maximum value (such as 1000ppm, 2000ppm, etc.) of the concentration range of the ambient refrigerant during normal operation of the device is defined.
In summary, the invention collects the concentration value of the refrigerant between the devices; calculating an average concentration according to the concentration value of the refrigerant between the devices; whether the refrigerant leaks or not is judged according to the average concentration, so that whether the refrigerant leaks or not on the ship is accurately judged, the error break is reduced, the normal concentration or the abnormal environmental concentration is distinguished, and quantitative management can be realized; and (4) according to the pre-judgment whether measures are taken in advance or not, the refrigerant spare parts are purchased, and the requirement of the sailing task of the troops and ships is guaranteed.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (2)
1. A method for judging the refrigerant leakage of a refrigeration device for a ship is characterized by comprising the following steps:
collecting a concentration value of a refrigerant between devices;
calculating an average concentration according to the concentration value of the refrigerant between the devices; and
judging whether the refrigerant leaks according to the average concentration;
the method for acquiring the concentration value of the refrigerant between the devices comprises the following steps:
when the equipment works normally, the concentration value of the refrigerant between the equipment is detected, and m effective concentration output values before the current moment are sequentially acquired, namely
Sequentially collecting a plurality of inter-equipment refrigerant concentration values, and eliminating invalid values in the inter-equipment refrigerant concentration values according to the distribution diagram so as to collect m effective concentration output values;
the method for calculating the average concentration according to the inter-equipment refrigerant concentration value comprises the following steps:
acquiring the concentration range of the refrigerant in the environment when the equipment normally operates according to the m effective concentration output values, and calculating the average concentration;
the method for calculating the average concentration comprises the following steps:
wherein d is0Is the average concentration; m is the number of effective concentration output values; d0aIs the a-th effective concentration output value;
the method for judging whether the refrigerant leaks according to the average concentration comprises the following steps:
when d isc＜k*d0Judging safety, not sending out alarm signal, and removing d01And applying the current concentration dcSequentially supplementing effective concentration output values, updating the average concentration, and judging whether the concentration at the next moment is safe or not according to the updated average concentration;
when d isc＞k*d0Judging that the operation is unsafe, not sending an alarm signal, and recording the continuous unsafe times n;
judging the refrigerant leakage when the continuous unsafe times N reach the preset times N, and giving an alarm;
wherein k is the maximum concentration allowable value dmaxAnd the average concentration d0The coefficient of variation of (a) is,
dcc is a non-0 natural number; n is a preset number of times, N belongs to [ N ∈ [ ]min,Nmax]，NminNumber of times corresponding to minimum value of interference time for ignoring outside concentration, NmaxThe number of times corresponding to the maximum value of the disturbance time in which the external concentration is ignored.
2. A system for judging refrigerant leakage of a refrigeration device for a ship is characterized by comprising:
the control module is a concentration sensor electrically connected with the control module;
the concentration sensor is suitable for detecting the concentration value of the refrigerant between the devices and sending the concentration value to the control module;
the control module is suitable for judging whether the refrigerant leaks according to the concentration value of the refrigerant between the devices;
the control module is suitable for judging whether the refrigerant leaks or not by adopting the method for judging the refrigerant leakage of the refrigeration device for the ship-based ship as claimed in claim 1.
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| JP3452666B2 (en) * | 1994-12-28 | 2003-09-29 | 株式会社東芝 | Freezer refrigerator |
| CN1314930C (en) * | 2002-01-15 | 2007-05-09 | 株式会社东芝 | Refrigerator with alarm device for alarming refrigerant leakage |
| CN102252404A (en) * | 2010-05-17 | 2011-11-23 | 珠海格力电器股份有限公司 | Air conditioner and control method thereof |
| GB2504036B (en) * | 2011-05-23 | 2018-02-21 | Mitsubishi Electric Corp | Air-conditioning apparatus |
| CN102269447B (en) * | 2011-07-14 | 2014-01-01 | 美的集团股份有限公司 | Air conditioner using combustible refrigerant, and control method of air conditioner |
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