US20100083689A1 - Detection of the state of a refrigerator door - Google Patents
Detection of the state of a refrigerator door Download PDFInfo
- Publication number
- US20100083689A1 US20100083689A1 US12/533,962 US53396209A US2010083689A1 US 20100083689 A1 US20100083689 A1 US 20100083689A1 US 53396209 A US53396209 A US 53396209A US 2010083689 A1 US2010083689 A1 US 2010083689A1
- Authority
- US
- United States
- Prior art keywords
- temperature
- door
- controller
- monitor
- doors
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- 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
- F25D23/00—General constructional features
- F25D23/02—Doors; Covers
-
- 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
- F25D2700/00—Means for sensing or measuring; Sensors therefor
- F25D2700/02—Sensors detecting door opening
-
- 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
- F25D2700/00—Means for sensing or measuring; Sensors therefor
- F25D2700/12—Sensors measuring the inside temperature
-
- 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
- F25D29/008—Alarm devices
Definitions
- This invention relates to control of refrigerators and particularly to detecting remotely whether a refrigerator door is open or closed.
- Refrigerated containers be they small units used in residences or large containers used for the shipping of perishable food items are designed to operate with their main access doors closed. Should these doors be open for extended periods of time, the cooling equipment is unable to keep the refrigerated cavity at the desired temperature. As a result, the refrigeration equipment continues to run for excessive periods of time, putting excessive stress on that equipment and consuming an unexpected amount of energy.
- door sensors which are used to turn off the refrigeration equipment when the doors are not closed.
- these sensors are composed of magnets on the moveable doors and magnetic field sensitive switches, such as “reed” switches mounted on the door frames. Electrical connections through these switches cause the refrigeration equipment to be disabled so long as the doors are open.
- timer implemented, which energizes some sort of user notification should the door(s) be kept open for an excessive time period.
- the status of a door is obtained by inference.
- FIG. 1 is a schematic diagram illustrating a refrigeration system embodying aspects of the invention.
- FIG. 2 is a schematic diagram illustrating a refrigeration system as shown in FIG. 1 and including a control and communication system embodying aspects of the invention.
- FIG. 3 is a flow chart illustrating the operation of the system in FIG. 1
- a refrigerated container includes a refrigeration unit 1 coupled with an insulated container 2 . Doors 3 on the container 2 facilitate insertion and removal of product within the container.
- the refrigeration unit 1 discharges cold air 4 into the container 2 , while warm air 5 is returned from the container to the refrigeration unit 1 for re-cooling.
- the refrigeration unit 1 is controlled by a thermostat 6 . It cycles the refrigeration unit 1 ON or OFF as required to bring the temperature of the container 2 to an acceptable departure from a desired setpoint 7 . Temperature feedback is provided by any combination of remote temperature probes 8 in the container 2 and return temperature of the warm air 5 .
- the system will be satisfied (i.e. container temperature measured at the probe or probes 8 is close to setpoint 7 within some time period. Then the refrigeration unit will cycle ON and OFF as required to maintain this temperature. Should the doors 3 be left open, the refrigeration unit 1 will run continuously, since the constant influx of warm outside ambient air prevents the refrigeration unit 1 from ever getting the container 2 to the proper temperature.
- the refrigerated system is continuously monitored by a local computer which in turn is connected wireles sly to an Information Technology system.
- a local computer which in turn is connected wireles sly to an Information Technology system.
- FIG. 2 This is illustrated in FIG. 2 .
- the refrigerated container 2 and refrigeration unit 1 are as described in FIG. 1 .
- Integral to the Refrigeration Unit 1 is a computer or controller 13 , which correctly operates the refrigeration machinery as appropriate to the various sensors throughout the system.
- This controller 13 is continuously monitored by a second computer labeled Monitor 14 . Should the Monitor 14 determine that a change in door state has occurred, it can communicate over a wireless link 16 to a Network Operations Center (NOC) 15 .
- NOC Network Operations Center
- the NOC 5 alerts a user to the change of state by any of several modalities including a website display 17 , pager 18 or cellphone text message 19 .
- the system determines that the doors have been left open by monitoring the time it takes the refrigeration unit to bring the container to the correct temperature. If the time exceeds a threshold value, it indicates that the doors 3 have been left open. If, following a door open state the container temperature once again cools down close to the set point, this indicates that the doors have once again been closed.
- the monitoring is done by the refrigeration controller 13 itself rather than by a separate monitoring device 14 as described above.
- the steps 31 to 38 are performed by the controller 13 .
- the steps 31 to 38 are performed by the monitor 14 .
- the steps 31 to 38 are performed by a combination of monitor 14 and controller 13 .
- the following description refers to the controller/monitor 13 / 14 , but it will be understood that the description applies equally to the embodiments involving the controller 13 alone, the monitor 14 alone, and to the controller 13 combined with the monitor 14 .
- step 31 the controller/monitor 13 / 14 determines whether the refrigeration unit is on by sensing whether a discharge 4 exits out of the refrigeration unit 1 . If the refrigeration unit is off, the controller/monitor 13 / 14 continues sensing for the discharge. In one embodiment, the controller/monitor 13 / 14 sends a signal 16 to the Network Operations Center (NOC) 15 informing the center 15 that no discharge 4 exits out of the refrigeration unit 1 and that the refrigeration unit 1 is off.
- NOC Network Operations Center
- step 32 the controller/monitor 13 / 14 regulates the defrosting operation of the refrigeration unit.
- the controller/monitor 13 / 14 interrogates its internal operation to indicate whether the container 2 is defrosting. If yes, the defrosting operation continues and the controller/monitor 13 / 14 issues as signal over the wireless link 16 to the Network Operations Center (NOC) 15 that the refrigeration container 2 is defrosting.
- NOC Network Operations Center
- the controller/monitor 13 / 14 compares the temperature at the temperature probe or probes 8 with the setpoint 7 , or setpoint temperature at the thermostat 6 , to see if they are equal within a given range. If not, this indicates that the temperature is necessarily higher than the setpoint 7 by an amount greater that the range of equality. Then, in step 34 , the controller/monitor 13 / 14 compares the temperature at the temperature probe 8 with the setpoint 7 temperature at the thermostat 6 for a given period, such as three minutes, to determine if the temperature at the temperature probe or probes 8 remains higher than the setpoint 7 for the give period, e.g. three minutes.
- the controller/monitor 13 / 14 continues comparing the temperature at the temperature probe 8 with the setpoint 7 . According to one embodiment, if the output of step 34 is NO, the controller/monitor 13 / 14 returns to the input of step 33 . According to another embodiment, the controller/monitor 13 / 14 sends a signal to the NOC 15 to the effect that the temperature is greater than the setpoint 7 but not for more than the given time e.g. 3 minutes.
- step 34 If the output of step 34 is yes, the temperature exceeds the setpoint for more than 3 minutes, the system proceeds to step 35 , to indicate that the door or doors 3 are open.
- the controller/monitor 13 / 14 then sends a signal indicating an open door to the NOC 15 .
- the system then returns to step 31 .
- step 36 the system determines whether the temperature at sensor 8 is equal to the setpoint 7 , within the limits set, for a predetermined period such as five minutes. If no, the operation returns to step 31 . If yes, this indicates that the door or doors 3 are closed. The controller/monitor 13 / 14 then sends a door closed signal to NOC 15 . The procedure returns to step 31 .
- step 38 the controller/monitor 13 / 14 responds to the YES at step 33 to send a signal to NOC 15 to indicate that the temperature at sensor 8 is within prescribed limits equal to the setpoint 7 .
- This is a way of indicating that although the temperature may not have equaled the setpoint 7 for the prescribed time, e.g. five minutes, the temperature has descended to the proper range.
- a signal indicating open doors when the system should be cooling sets off an alarm to inform personnel to close the doors.
- a feedback arrangement closes the doors when the system should be cooling.
- the embodiments infer the position of the door of a refrigeration system by analysis of specific temperature profiles from within the controlled cavity or container.
- the embodiments use inference of door status without the need for physical switches or wiring.
- the embodiments infer that the doors have been left open by monitoring the time it takes the refrigeration unit to bring the container to the correct temperature. If it exceeds a threshold value, it is inferred that the doors have been left open. If, following a door open state the container temperature once again cools down close to the setpoint 7 , it is inferred that the doors have once again been closed.
Abstract
Description
- This application is related to U.S. application No. 61085400 filed 31 Jul. 2008 and No. 61085823 filed 1 Aug. 2008. Applicant hereby claims priority of these applications, and the content of these applications are hereby incorporated in this application as if fully recited herein.
- This invention relates to control of refrigerators and particularly to detecting remotely whether a refrigerator door is open or closed.
- Refrigerated containers, be they small units used in residences or large containers used for the shipping of perishable food items are designed to operate with their main access doors closed. Should these doors be open for extended periods of time, the cooling equipment is unable to keep the refrigerated cavity at the desired temperature. As a result, the refrigeration equipment continues to run for excessive periods of time, putting excessive stress on that equipment and consuming an unexpected amount of energy.
- Many such pieces of equipment are equipped with door sensors, which are used to turn off the refrigeration equipment when the doors are not closed. Typically, these sensors are composed of magnets on the moveable doors and magnetic field sensitive switches, such as “reed” switches mounted on the door frames. Electrical connections through these switches cause the refrigeration equipment to be disabled so long as the doors are open. In addition, there may be a timer implemented, which energizes some sort of user notification should the door(s) be kept open for an excessive time period.
- The effort of wiring such door switches can be significant in large pieces of industrial refrigeration equipment, such as truck trailers or ocean-going containers. This is exacerbated when attempting to install door switches in an after-market situation, where as much as 50 feet of wire may have to be channeled from the rear-mounted doors to the front-mounted refrigeration equipment.
- According to an embodiment of the invention, the status of a door is obtained by inference.
-
FIG. 1 is a schematic diagram illustrating a refrigeration system embodying aspects of the invention. -
FIG. 2 is a schematic diagram illustrating a refrigeration system as shown inFIG. 1 and including a control and communication system embodying aspects of the invention. -
FIG. 3 is a flow chart illustrating the operation of the system inFIG. 1 - In
FIG. 1 a refrigerated container includes arefrigeration unit 1 coupled with an insulatedcontainer 2.Doors 3 on thecontainer 2 facilitate insertion and removal of product within the container. Therefrigeration unit 1 dischargescold air 4 into thecontainer 2, whilewarm air 5 is returned from the container to therefrigeration unit 1 for re-cooling. - The
refrigeration unit 1 is controlled by athermostat 6. It cycles therefrigeration unit 1 ON or OFF as required to bring the temperature of thecontainer 2 to an acceptable departure from a desired setpoint 7. Temperature feedback is provided by any combination ofremote temperature probes 8 in thecontainer 2 and return temperature of thewarm air 5. - If the refrigerated
container 2 is closed, the system will be satisfied (i.e. container temperature measured at the probe orprobes 8 is close to setpoint 7 within some time period. Then the refrigeration unit will cycle ON and OFF as required to maintain this temperature. Should thedoors 3 be left open, therefrigeration unit 1 will run continuously, since the constant influx of warm outside ambient air prevents therefrigeration unit 1 from ever getting thecontainer 2 to the proper temperature. - In one embodiment, the refrigerated system is continuously monitored by a local computer which in turn is connected wireles sly to an Information Technology system. This is illustrated in
FIG. 2 . Here, the refrigeratedcontainer 2 andrefrigeration unit 1 are as described inFIG. 1 . Integral to theRefrigeration Unit 1 is a computer orcontroller 13, which correctly operates the refrigeration machinery as appropriate to the various sensors throughout the system. Thiscontroller 13 is continuously monitored by a second computer labeled Monitor 14. Should theMonitor 14 determine that a change in door state has occurred, it can communicate over awireless link 16 to a Network Operations Center (NOC) 15. This wireless link may be any of a local RF network, cellphone, satellite, etc. - The
NOC 5 alerts a user to the change of state by any of several modalities including awebsite display 17,pager 18 orcellphone text message 19. - The system determines that the doors have been left open by monitoring the time it takes the refrigeration unit to bring the container to the correct temperature. If the time exceeds a threshold value, it indicates that the
doors 3 have been left open. If, following a door open state the container temperature once again cools down close to the set point, this indicates that the doors have once again been closed. - According to an embodiment the monitoring is done by the
refrigeration controller 13 itself rather than by aseparate monitoring device 14 as described above. -
FIG. 3 is a flowchart illustrating the operation. Here, for simplicity, “=” has been used to indicate an approximate equality within acceptable bounds. The system followssteps 31 to 38. - According to one embodiment of the invention, the
steps 31 to 38 are performed by thecontroller 13. According to another embodiment, thesteps 31 to 38 are performed by themonitor 14. According to yet another embodiment, thesteps 31 to 38 are performed by a combination ofmonitor 14 andcontroller 13. For simplicity, the following description refers to the controller/monitor 13/14, but it will be understood that the description applies equally to the embodiments involving thecontroller 13 alone, themonitor 14 alone, and to thecontroller 13 combined with themonitor 14. - In
step 31 the controller/monitor 13/14 determines whether the refrigeration unit is on by sensing whether adischarge 4 exits out of therefrigeration unit 1. If the refrigeration unit is off, the controller/monitor 13/14 continues sensing for the discharge. In one embodiment, the controller/monitor 13/14 sends asignal 16 to the Network Operations Center (NOC) 15 informing thecenter 15 that nodischarge 4 exits out of therefrigeration unit 1 and that therefrigeration unit 1 is off. - If the response to in
step 31 is yes, that is if the refrigeration unit is on, the controller/monitor 13/14 proceeds tostep 32. The controller/monitor 13/14 regulates the defrosting operation of the refrigeration unit. Thus instep 32, the controller/monitor 13/14 interrogates its internal operation to indicate whether thecontainer 2 is defrosting. If yes, the defrosting operation continues and the controller/monitor 13/14 issues as signal over thewireless link 16 to the Network Operations Center (NOC) 15 that therefrigeration container 2 is defrosting. - If the output at
step 32 is no, the refrigeratedcontainer 2 is not defrosting, the controller/monitor 13/14, instep 33, compares the temperature at the temperature probe orprobes 8 with the setpoint 7, or setpoint temperature at thethermostat 6, to see if they are equal within a given range. If not, this indicates that the temperature is necessarily higher than the setpoint 7 by an amount greater that the range of equality. Then, instep 34, the controller/monitor 13/14 compares the temperature at thetemperature probe 8 with the setpoint 7 temperature at thethermostat 6 for a given period, such as three minutes, to determine if the temperature at the temperature probe orprobes 8 remains higher than the setpoint 7 for the give period, e.g. three minutes. If not, the controller/monitor 13/14 continues comparing the temperature at thetemperature probe 8 with the setpoint 7. According to one embodiment, if the output ofstep 34 is NO, the controller/monitor 13/14 returns to the input ofstep 33. According to another embodiment, the controller/monitor 13/14 sends a signal to theNOC 15 to the effect that the temperature is greater than the setpoint 7 but not for more than the given time e.g. 3 minutes. - If the output of
step 34 is yes, the temperature exceeds the setpoint for more than 3 minutes, the system proceeds tostep 35, to indicate that the door ordoors 3 are open. The controller/monitor 13/14 then sends a signal indicating an open door to theNOC 15. The system then returns to step 31. - If the output at
step 33 is yes, namely that the temperature is effectively equal to the setpoint 7 the controller/monitor 13/14 proceeds to step 36 as well asstep 38. Instep 36 the system determines whether the temperature atsensor 8 is equal to the setpoint 7, within the limits set, for a predetermined period such as five minutes. If no, the operation returns to step 31. If yes, this indicates that the door ordoors 3 are closed. The controller/monitor 13/14 then sends a door closed signal toNOC 15. The procedure returns to step 31. - In
step 38, the controller/monitor 13/14 responds to the YES atstep 33 to send a signal toNOC 15 to indicate that the temperature atsensor 8 is within prescribed limits equal to the setpoint 7. This is a way of indicating that although the temperature may not have equaled the setpoint 7 for the prescribed time, e.g. five minutes, the temperature has descended to the proper range. - According to an embodiment a signal indicating open doors when the system should be cooling sets off an alarm to inform personnel to close the doors. According to another embodiment, a feedback arrangement closes the doors when the system should be cooling.
- The embodiments infer the position of the door of a refrigeration system by analysis of specific temperature profiles from within the controlled cavity or container. The embodiments use inference of door status without the need for physical switches or wiring. The embodiments infer that the doors have been left open by monitoring the time it takes the refrigeration unit to bring the container to the correct temperature. If it exceeds a threshold value, it is inferred that the doors have been left open. If, following a door open state the container temperature once again cools down close to the setpoint 7, it is inferred that the doors have once again been closed.
- While embodiments have been described in detail it will be recognized that the invention can be embodied otherwise without departing from its spirit and scope
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US12/533,962 US20100083689A1 (en) | 2008-07-31 | 2009-07-31 | Detection of the state of a refrigerator door |
Applications Claiming Priority (3)
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US8540008P | 2008-07-31 | 2008-07-31 | |
US8582308P | 2008-08-01 | 2008-08-01 | |
US12/533,962 US20100083689A1 (en) | 2008-07-31 | 2009-07-31 | Detection of the state of a refrigerator door |
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US20100083689A1 true US20100083689A1 (en) | 2010-04-08 |
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US12/533,962 Abandoned US20100083689A1 (en) | 2008-07-31 | 2009-07-31 | Detection of the state of a refrigerator door |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130128495A1 (en) * | 2009-07-09 | 2013-05-23 | Mathieu Audet | Method and system for managing appliance equipmets |
US9007205B2 (en) | 2011-06-01 | 2015-04-14 | Thermo King Corporation | Embedded security system for environment-controlled transportation containers and method for detecting a security risk for environment-controlled transportation containers |
US20210072119A1 (en) * | 2010-03-15 | 2021-03-11 | Klatu Networks, Inc. | Systems and methods for monitoring, inferring state of health, and optimizing efficiency of refrigeration systems |
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EP0277104A1 (en) * | 1987-01-21 | 1988-08-03 | Aktiebolaget Electrolux | Temperature supervising arrangement for a cabinet or the like |
US5231844A (en) * | 1991-01-26 | 1993-08-03 | Samsung Electronics Co., Ltd. | Defrost control method for refrigerator |
US5451930A (en) * | 1992-07-27 | 1995-09-19 | Mcdaniel; Steven M. | Emergency condition, door ajar, and temperature alarm for appliances |
US5842355A (en) * | 1995-03-22 | 1998-12-01 | Rowe International, Inc. | Defrost control system for a refrigerator |
US20020000092A1 (en) * | 2000-01-07 | 2002-01-03 | Sharood John N. | Refrigeration monitor unit |
US6471398B2 (en) * | 1996-10-17 | 2002-10-29 | Hoshizaki Denki Kabushiki Kaisha | Temperature management apparatus for foodstuff in storage cabinet |
US7032405B2 (en) * | 2002-10-31 | 2006-04-25 | Lg Electronics Inc. | Apparatus for fixing printed circuit board of refrigerator |
US20070227161A1 (en) * | 2004-02-12 | 2007-10-04 | Whirlpool Corporation | Refrigerator and a Method for Controlling Variable Cooling Capacity Thereof |
-
2009
- 2009-07-31 US US12/533,962 patent/US20100083689A1/en not_active Abandoned
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0277104A1 (en) * | 1987-01-21 | 1988-08-03 | Aktiebolaget Electrolux | Temperature supervising arrangement for a cabinet or the like |
US5231844A (en) * | 1991-01-26 | 1993-08-03 | Samsung Electronics Co., Ltd. | Defrost control method for refrigerator |
US5451930A (en) * | 1992-07-27 | 1995-09-19 | Mcdaniel; Steven M. | Emergency condition, door ajar, and temperature alarm for appliances |
US5842355A (en) * | 1995-03-22 | 1998-12-01 | Rowe International, Inc. | Defrost control system for a refrigerator |
US6471398B2 (en) * | 1996-10-17 | 2002-10-29 | Hoshizaki Denki Kabushiki Kaisha | Temperature management apparatus for foodstuff in storage cabinet |
US20020000092A1 (en) * | 2000-01-07 | 2002-01-03 | Sharood John N. | Refrigeration monitor unit |
US7032405B2 (en) * | 2002-10-31 | 2006-04-25 | Lg Electronics Inc. | Apparatus for fixing printed circuit board of refrigerator |
US20070227161A1 (en) * | 2004-02-12 | 2007-10-04 | Whirlpool Corporation | Refrigerator and a Method for Controlling Variable Cooling Capacity Thereof |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130128495A1 (en) * | 2009-07-09 | 2013-05-23 | Mathieu Audet | Method and system for managing appliance equipmets |
US20210072119A1 (en) * | 2010-03-15 | 2021-03-11 | Klatu Networks, Inc. | Systems and methods for monitoring, inferring state of health, and optimizing efficiency of refrigeration systems |
US11927506B2 (en) * | 2010-03-15 | 2024-03-12 | Klatu Networks, Inc. | Systems and methods for monitoring, inferring state of health, and optimizing efficiency of refrigeration systems |
US9007205B2 (en) | 2011-06-01 | 2015-04-14 | Thermo King Corporation | Embedded security system for environment-controlled transportation containers and method for detecting a security risk for environment-controlled transportation containers |
US9555772B2 (en) | 2011-06-01 | 2017-01-31 | Thermo King Corporation | Embedded security system for environment-controlled transportation containers and method for detecting a security risk for environment-controlled transportation containers |
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