JP4135589B2 - Showcase internal set temperature estimation device, internal set temperature estimation program, and internal set temperature estimation method - Google Patents

Description

  The present invention is useful when, for example, it is extremely difficult to establish a communication connection between a showcase and a monitoring device for commercial reasons and the like, and the internal set temperature information cannot be obtained directly from the showcase. TECHNICAL FIELD The present invention relates to a showcase internal set temperature estimation device, an internal set temperature estimation program, and an internal set temperature estimation method that can estimate the internal set temperature.

2. Description of the Related Art Conventionally, a technique for monitoring the operation state of a showcase using the internal temperature information and the internal set temperature information is well known (see, for example, Patent Document 1).
JP-A-8-61814 (Section 3-6, FIGS. 1 and 3)

  However, at this time, if such a showcase monitoring method is to be introduced in a store, the existing showcase must be discarded and a new showcase system compatible with such a monitoring method must be purchased. Seems to be the case. Because, at present, stores often have various manufacturers and showcases of various ages, and there are cases in which it is quite difficult to establish communication connections between these showcases and monitoring devices. This is because it is assumed that it is the majority. In general, when establishing a communication connection between devices, it is necessary to select a communication line and an appropriate communication protocol suitable for those devices, but in reality the standard of the communication line and its connection port, communication protocol, etc. The reason for the inference is that there are not a few original manufacturers for commercial reasons, and even if the manufacturers are the same, the standards are often different for different ages.

  Even if the problem of the present invention is that it is extremely difficult to establish a communication connection between a showcase and its monitoring device, etc., and it is not possible to directly acquire internal temperature information, internal set temperature information, etc. from the showcase, Provided is a showcase chamber set temperature estimation device, a chamber set temperature estimation program, and a chamber set temperature estimation method that enable monitoring of the showcase operating state using the chamber temperature information and the chamber set temperature information. There is.

The showcase internal set temperature estimation device according to claim 1 is a showcase internal set temperature estimation device for estimating the showcase internal set temperature, the internal temperature information acquiring means , and the defrost execution time. An information acquisition means, a specific internal temperature information removal means, an average internal temperature information calculation means, and an internal set temperature determination means are provided. The inside temperature information acquisition means acquires the inside temperature information of the showcase. The defrost execution time acquisition means acquires information on the execution time of defrost performed in the showcase (hereinafter referred to as “defrost execution time information”). The specific internal temperature information removing unit removes the internal temperature information corresponding to the defrost execution time information from the internal temperature information acquired by the internal temperature information acquiring unit. The average chamber temperature information calculation unit obtains an average value of the chamber temperature information (hereinafter referred to as “effective chamber temperature information”) that has not been removed by the specific chamber temperature information removal unit. The in-compartment set temperature determining means determines the average value of the effective in-compartment temperature information as the showcase internal set temperature.

For this reason, even if it is extremely difficult to establish a communication connection between a showcase and its monitoring device, etc., even if it is not possible to directly obtain the chamber temperature information or the chamber set temperature information from the showcase, the chamber temperature It is possible to monitor the operating state of the showcase using the information and the set temperature information in the cabinet. Further, in the showcase chamber set temperature estimation device, even if the defrost operation is performed in the showcase, the chamber set temperature is estimated by excluding the portion of the chamber temperature corresponding to the defrost execution time. Can do. Therefore, it is possible to estimate an appropriate internal set temperature.

The showcase internal set temperature estimation apparatus according to claim 2 is the showcase internal set temperature estimation apparatus according to claim 1 , further comprising a first determination unit. The first determination means determines whether the internal temperature information or the moving average value or the maximum value of the internal temperature information is within a predetermined threshold . In addition, the internal set temperature determining means determines the average of the effective internal temperature information when the first determining means determines that the moving temperature value or the maximum value of the internal temperature information is within a predetermined threshold. The value is determined as the set temperature in the showcase .

When the showcase is operating normally, the internal temperature may be considered to be substantially equal to the internal set temperature. On the other hand, if the showcase is not operating normally and its internal temperature is approximately equal to the internal set temperature, this will interfere with the monitoring of the showcase's operating state. However, here, the first determination means determines whether the internal temperature information or the moving average value or the maximum value of the internal temperature information is within a predetermined threshold . Then, when the internal set temperature determining means determines that the internal temperature information or the moving average value or the maximum value of the internal temperature information is within the predetermined threshold in the first determining means, the average of the effective internal temperature information The value is determined as the set temperature in the showcase . For this reason, it is possible to eliminate the possibility of hindering the operation state monitoring of the showcase.

The showcase internal set temperature estimation device according to claim 3 is the showcase internal set temperature estimation device according to claim 1 , further comprising a second determination means. The second determination means determines whether or not the internal temperature information or the moving average value of the internal temperature information or the gradient with respect to the maximum value time is within a predetermined threshold. In addition, the internal set temperature determining means determines whether the internal temperature information or the moving average value of the internal temperature information or the gradient with respect to the time of the maximum value is within a predetermined threshold in the second determining means. The average value of the temperature information is determined as the set temperature in the showcase.

  The temperature inside the showcase is usually kept constant. However, when a frost layer is formed on a part of the refrigeration apparatus that cools the interior of the showcase and reaches a certain thickness, the cooling capacity of the refrigeration apparatus decreases. That is, the internal temperature starts to gradually increase. If the temperature in the showcase cabinet in such an operating state is set to the set temperature in the cabinet, this will interfere with the monitoring of the showcase operating status. However, such a phenomenon can be grasped here. That is, it can be determined that the operation state of the showcase is not normal when a certain gradient is seen in the time transition of the internal temperature. Therefore, it is possible to eliminate the possibility of hindering the operation state monitoring of the showcase.

The showcase internal set temperature estimation device according to claim 4 is the showcase internal set temperature estimation device according to claim 1 , further comprising receiving means and third determination means . The receiving means receives the start / stop signal of the refrigerator in the showcase. The third determination means determines whether the frequency of the start / stop signal per unit time is within a predetermined threshold. Then, the internal set temperature determining means calculates the average value of the effective internal temperature information in the showcase storage when the third determining means determines that the frequency of the start / stop signal per unit time is within a predetermined threshold. Determine the set temperature.

  Even when it is extremely difficult to establish a communication connection between the showcase and the monitoring device, the start / stop signal of the refrigerator in the showcase may be obtained relatively easily. Usually, the temperature inside the showcase is kept constant by the continuous start and stop of the refrigerator. That is, here, it is possible to determine whether or not the operation state of the showcase is normal in consideration of the degree of start / stop of the refrigerator. Therefore, it is possible to eliminate the possibility of hindering the operation state monitoring of the showcase.

The showcase internal set temperature estimation device according to claim 5 is the showcase internal set temperature estimation device according to claim 1, further comprising a fourth determination means. A 4th determination means determines whether the frequency | count of the raise / lower of the internal temperature per unit time is in a predetermined threshold value. Then, the internal set temperature determination means calculates the average value of the effective internal temperature information in the showcase when the fourth determination means determines that the number of rises and falls of the internal temperature per unit time is within a predetermined threshold. Determine the set temperature in the chamber.

The showcase internal set temperature estimation device according to claim 6 is the showcase internal set temperature estimation device according to any one of claims 1 to 5, wherein the average value is a moving average value. .

The showcase internal set temperature estimation device according to claim 7 is the showcase internal set temperature estimation device according to any one of claims 2 to 6, wherein the predetermined threshold value is an operating environment of the showcase. Fluctuates according to. The “operating environment” referred to here is an outdoor temperature, an indoor temperature, or the like.

  Here, it is possible to improve the accuracy of the determination as to whether or not the operation state of the showcase is normal.

  The showcase internal set temperature estimation device according to claim 8 is the showcase internal set temperature estimation device according to any one of claims 1 to 7, and is provided far from the showcase.

  Here, the service temperature estimation service in the showcase can be performed extensively.

The showcase internal set temperature estimation program according to claim 9 is a showcase internal set temperature estimation program for estimating the showcase internal set temperature, and obtains internal temperature information from the computer. A step , a defrost execution time information acquisition step, a specific internal temperature information removal step, an average internal temperature information calculation step, and an internal set temperature determination step are executed . The inside temperature information acquisition step, the computer, Ru to acquire the inside temperature information of the showcase. In the defrost execution time information acquisition step, the computer is made to acquire information on the execution time of defrost performed in the showcase (hereinafter referred to as “defrost execution time information”). In the specific chamber temperature information removal step, the computer causes the chamber temperature information corresponding to the defrost execution time information to be removed from the chamber temperature information acquired by the chamber temperature information acquisition means. In the average chamber temperature information calculation step, the computer is caused to obtain an average value of the chamber temperature information (hereinafter referred to as “effective chamber temperature information”) that has not been removed by the specific chamber temperature information removing unit. In the chamber set temperature determination step, the computer determines the average value of the effective chamber temperature information as the showcase chamber set temperature.

  For this reason, even if it is extremely difficult to establish a communication connection between a showcase and its monitoring device, etc., even if it is not possible to directly obtain the chamber temperature information or the chamber set temperature information from the showcase, the chamber temperature It is possible to monitor the operating state of the showcase using the information and the set temperature information in the cabinet.

The internal set temperature estimation method of the showcase according to claim 10 is a storage room set temperature estimating method of the showcase to estimate the internal set temperature of the showcase, the computer, the internal temperature information acquisition A step , a defrost execution time information acquisition step, a specific internal temperature information removal step, an average internal temperature information calculation step, and an internal set temperature determination step are executed . The inside temperature information acquisition step, the computer, Ru to acquire the inside temperature information of the showcase. In the defrost execution time information acquisition step, the computer is made to acquire information on the execution time of defrost performed in the showcase (hereinafter referred to as “defrost execution time information”). In the specific chamber temperature information removal step, the computer causes the chamber temperature information corresponding to the defrost execution time information to be removed from the chamber temperature information acquired by the chamber temperature information acquisition means. In the average chamber temperature information calculation step, the computer is caused to obtain an average value of the chamber temperature information (hereinafter referred to as “effective chamber temperature information”) that has not been removed by the specific chamber temperature information removing unit. In the chamber set temperature determination step, the computer determines the average value of the effective chamber temperature information as the showcase chamber set temperature.

  For this reason, even if it is extremely difficult to establish a communication connection between a showcase and its monitoring device, etc., even if it is not possible to directly obtain the chamber temperature information or the chamber set temperature information from the showcase, the chamber temperature It is possible to monitor the operating state of the showcase using the information and the set temperature information in the cabinet.

  In the showcase chamber set temperature estimation device according to claim 1, it is extremely difficult to establish a communication connection between the showcase and its monitoring device, and the showcase temperature information, the set temperature information, etc. are stored in the showcase. Even if it is not possible to obtain directly from the display, it is possible to monitor the operation state of the showcase using the internal temperature information and the internal set temperature information.

In the showcase in-chamber set temperature estimating apparatus according to claims 2 to 4 , it is possible to eliminate the possibility of hindering the operation state monitoring of the showcase.

  In the showcase internal set temperature estimation device according to claim 7, it is possible to improve the accuracy of the determination as to whether or not the operation state of the showcase is normal.

  In the showcase in-chamber set temperature estimation device according to claim 8, the showcase in-box set temperature estimation service can be widely performed.

  When the program for estimating the set temperature in the showcase according to claim 9 is executed, it is extremely difficult to establish a communication connection between the showcase and its monitoring device, etc., and the temperature information in the store, the set temperature information in the store, etc. Even if it is not possible to directly acquire from the showcase, it is possible to monitor the operation state of the showcase using the internal temperature information and the internal set temperature information.

  When the method for estimating the set temperature in the showcase according to claim 10 is implemented, it is extremely difficult to establish a communication connection between the showcase and its monitoring device, etc., and the temperature information in the store, the set temperature information in the store, etc. Even if it is not possible to directly acquire from the showcase, it is possible to monitor the operation state of the showcase using the internal temperature information and the internal set temperature information.

<System configuration of showcase monitoring system>
FIG. 1 shows a block diagram of the showcase monitoring system 100. The showcase monitoring system 100 includes a temperature sensor 12, a contact sensor 22, an interface 15 (hereinafter abbreviated as I / F), a modem 30, and a monitoring computer 40. The temperature sensor 12 is attached to the inside of the showcase 10. The contact sensor 22 is attached to the contact of the defrost control device 20. The I / F 15 and the modem 30 are arranged in the stores 61 and 63. On the other hand, the monitoring computer 40 is disposed in the monitoring center 70. The monitoring center 70 is provided far from the stores 61 and 63.

<Monitoring and connection targets of the showcase monitoring system>
(1) Showcase 10
The showcase 10 is a monitoring target of the showcase monitoring system 100. A defrost heater 21 is provided in the vicinity of the heat exchanger (not shown) of the showcase 10, and the defrost operation is performed by the defrost control device 20. Further, as described above, the temperature sensor 12 is attached to the inside of the showcase 10.

(2) Defrost control device 20
The defrost control device 20 has a built-in timer, and is designed so that the contact point of the defrost heater 21 is turned ON during the set time of the timer. As described above, the contact sensor 22 is attached to the contact of the defrost control device 20.

<System Components of Showcase Monitoring System 100>
(1) Temperature sensor 12
The temperature sensor 12 is attached to the interior of the showcase 10 and generates an electrical signal based on the temperature in the interior.

(2) Contact sensor 22
The contact sensor 22 is attached to the contact of the defrost control device 20 and generates an electrical signal based on ON / OFF information of the defrost heater 21.

(3) I / F15
The I / F 15 converts electrical signals transmitted from the temperature sensor 12 and the contact sensor 22 into an information format that can be read by the monitoring computer 40. Further, the I / F 15 adds its own ID information, acquisition time information, and the like to the measurement value information and ON / OFF information.

(4) Modem 30
The modem 30 transmits the information group (measurement value information, ON / OFF information, I / F ID information, acquisition time information, etc.) transmitted from the I / F 15 to the monitoring computer 40 via the public telephone line 50. .

(5) Monitoring computer 40
The monitoring computer 40 includes a modem 43, a CPU 45 and a hard disk 47. The modem 43 receives a group of information transmitted from the modem 30 provided in the stores 61 and 63. The hard disk 47 holds a monitoring program 41 and a database 48. In the monitoring program 41, when information groups are received, an instruction to store them in the database 48 according to a predetermined rule, an instruction to estimate the set temperature in the showcase 10 and the estimated set temperature in the showcase A command for confirming whether the operation state of the case 10 is normal is described. The CPU 45 executes instructions described in the monitoring program 41.

<Connection form of showcase monitoring system 100>
The temperature sensor 12 and the contact sensor 22 are connected to the I / F 15. The I / F 15 is connected to the modem 30. The modem 30 is connected to a modem 43 built in the monitoring computer 40 via a public telephone line 50.

<Flow to estimate the set temperature in the chamber>
In FIG. 2, the flowchart showing the flow until estimation of the set temperature in a store | warehouse | chamber is shown.

  In FIG. 2, in step S <b> 11, the CPU 45 removes the internal temperature data corresponding to the time when the ON information of the defrost heater 21 is acquired from the total internal temperature data stored in the database 48 according to the monitoring program 41. In step S <b> 12, the CPU 45 calculates the moving average At of the internal temperature data remaining in step S <b> 11 according to the monitoring program 41. In step S <b> 13, the CPU 45 calculates the gradient ΔT of the moving average At for a predetermined period according to the monitoring program 41. In step S <b> 14, the CPU 45 confirms whether ΔT is smaller than the threshold value ΔTs according to the monitoring program 41. As a result of the confirmation in step S14, if ΔT is smaller than the threshold value ΔTs, the process proceeds to step S15. If ΔT is greater than or equal to the threshold value ΔTs as a result of the confirmation in step S14, the process returns to step S11. In step S15, the CPU 45 confirms whether the moving average At is constant for a predetermined period according to the monitoring program 41. As a result of the confirmation in step S15, if the moving average At is constant for a predetermined period, the process proceeds to step S16. As a result of the confirmation in step S15, if the moving average At is not constant for a predetermined period, the process returns to step S11. In step S <b> 16, the CPU 45 sets At to the internal set temperature according to the monitoring program 41.

<Monitoring of the showcase 10 by the showcase monitoring system 100>
In the showcase monitoring system 100, the operating state of the showcase 10 is monitored based on the interior set temperature estimated above. For example, if the internal temperature of the showcase 10 remains higher than the internal set temperature + 10 ° C. for a predetermined time, it is determined that an abnormality has occurred in the showcase 10 and a service engineer is invited to go to the site. Do that.

<Characteristics of the showcase monitoring system 100>
(1)
In the showcase monitoring system 100, the internal temperature of the showcase 10 is measured by the temperature sensor 12. Then, the CPU 45 estimates the internal set temperature from the internal temperature according to the monitoring program 41. For this reason, even if it is extremely difficult to establish a communication connection between the showcase 10 and the monitoring device and the internal temperature and the internal set temperature cannot be directly acquired from the showcase 10, It is possible to make it possible to monitor the operation state of the showcase 10 using the internal set temperature or the like.

(2)
In the showcase monitoring system 100, the contact sensor 22 detects an ON / OFF signal of the defrost heater 21. Further, the acquisition time is added to the ON / OFF information converted in the I / F 15. Then, the CPU 45 determines the set internal temperature of the showcase 10 using the internal temperature data and the acquisition time in accordance with the monitoring program 41. For this reason, even when the defrost operation is performed in the showcase 10, the internal set temperature can be estimated by excluding the internal temperature data of the portion corresponding to the defrost execution time. Therefore, it is possible to estimate an appropriate internal set temperature.

(3)
When the showcase 10 is operating normally, the internal temperature may be considered to be substantially equal to the internal set temperature. On the other hand, if the showcase is not operating normally and its internal temperature is approximately equal to the internal set temperature, this will interfere with the monitoring of the showcase's operating state. However, in the present showcase monitoring system 100, the CPU 45 determines whether or not the operating state of the showcase 10 is normal according to the monitoring program 41, and when it is determined that the operating state is normal, the internal set temperature To decide. For this reason, it is possible to eliminate the possibility of hindering the operation state monitoring of the showcase 10.

(4)
In the showcase monitoring system 100, it is confirmed whether the internal temperature data for a predetermined period is constant for a predetermined period. For this reason, it is possible to easily determine whether or not the operation state of the showcase 10 is normal.

(5)
The interior temperature of the showcase 10 is normally kept constant. However, when a frost layer is formed on a part of the refrigeration apparatus (for example, a heat exchanger) that cools the interior of the showcase 10 and reaches a certain thickness, the cooling capacity of the refrigeration apparatus decreases. That is, the internal temperature starts to gradually increase. If the internal temperature of the showcase 10 in such an operation state is set to the internal set temperature, the operation state monitoring of the showcase 10 will be hindered. However, the showcase monitoring system 100 determines that the operating state of the showcase 10 is not normal when the temperature gradient ΔT of the moving average At is greater than or equal to the threshold value ΔTs. Accordingly, it is possible to eliminate the possibility of hindering the monitoring of the operating state of the showcase 10.

(6)
In the showcase monitoring system 100, a monitoring computer 40 is provided far away from the showcase 10. For this reason, the internal set temperature estimation service of the showcase 10 can be performed extensively.

<Modification>
(1)
In the showcase monitoring system 100 according to the previous embodiment, the monitoring computer 40 is arranged in the monitoring center 70 in the remote place of the stores 61 and 63, but the monitoring computer 40 is arranged in each store 61 and 63. Also good. In this way, local monitoring of the showcase 10 can be realized. In this case, the I / F 15 can be directly connected to the monitoring computer 40.

(2)
In the showcase monitoring system 100 according to the previous embodiment, it is determined whether or not the operation state of the showcase 10 is normal in step S14 and step S15. If it can be acquired relatively easily, in addition to this, during any process from step S13 to step S16, a normality determination process using the number of ON / OFF times of the refrigerator per unit time is performed. You may go.

(3)
In the showcase monitoring system 100 according to the previous embodiment, it is determined in step S14 and step S15 whether or not the operating state of the showcase 10 is normal. In addition, from step S13 to step S16. During any of these processes, a normality determination process using the number of rises and falls of the internal temperature per unit time may be performed.

(4)
In the showcase monitoring system 100 according to the previous embodiment, whether or not the operating state of the showcase 10 is normal is determined based on the threshold value ΔTs in step S14. This threshold value ΔTs is the environment of the stores 61 and 63. It may be made to fluctuate according to. In this way, it is possible to improve the accuracy of determining whether or not the operating state of the showcase 10 is normal.

  By using the showcase internal set temperature estimation device, the internal set temperature estimation program, and the internal set temperature estimation method according to the present invention, establishment of a communication connection between the showcase and the monitoring device for commercial reasons. Even if it is extremely difficult to obtain the temperature inside the cabinet or the set temperature in the cabinet directly from the showcase, it is possible to monitor the showcase using the cabinet temperature or the preset temperature inside the cabinet. it can.

1 is a block diagram showing a showcase monitoring system 100. FIG. The flowchart showing the flow of estimation of chamber preset temperature.

Explanation of symbols

10 Showcase 12 Temperature sensor 15 Interface (I / F)
20 Defrost Control Device 21 Defrost Heater 22 Contact Sensor 30, 43 Modem 40 Monitoring Computer 41 Monitoring Program 45 CPU
47 hard disk 48 database 50 public telephone line 61,63 store 70 monitoring center 100 showcase monitoring system

Claims (10)

A showcase internal temperature setting apparatus (40) for estimating an internal set temperature of a showcase (10),
Chamber temperature information acquisition means (12, 15, 43) for acquiring the chamber temperature information of the showcase (10);
Defrost execution time information acquisition means (15, 22, 43) for acquiring defrost execution time information (hereinafter referred to as “defrost execution time information”) performed in the showcase (10);
Specific chamber temperature information removing means for removing the chamber temperature information corresponding to the defrost execution time information from the chamber temperature information acquired by the chamber temperature information acquiring unit;
Average chamber temperature information calculating means for obtaining an average value of the chamber temperature information (hereinafter referred to as “effective chamber temperature information”) that has not been removed by the specific chamber temperature information removing unit;
A set temperature estimating device for a showcase (41, 45) including a set temperature determining means (41, 45) for determining an average value of the effective inside temperature information as the set temperature in the showcase ( 40). A first determination means for determining whether the internal temperature information or the moving average value or the maximum value of the internal temperature information is within a predetermined threshold;
The in- compartment set temperature determination unit is configured to determine the effective in-compartment temperature when the first determination unit determines that the internal temperature information or the moving average value or the maximum value of the internal temperature information is within a predetermined threshold. The apparatus for estimating a set temperature in a showcase according to claim 1 , wherein an average value of information is determined as a set temperature in the showcase. A second determination means for determining whether or not a gradient with respect to time of the internal temperature information or the moving average value or the maximum value of the internal temperature information is within a predetermined threshold;
The internal set temperature determining means is configured to determine that the second determination means determines that the internal temperature information or the moving average value of the internal temperature information or the gradient with respect to the time of the maximum value is within a predetermined threshold. The apparatus for estimating a set temperature in a showcase according to claim 1 , wherein an average value of effective chamber temperature information is determined as a set temperature in the showcase. Receiving means for receiving a start-stop signal of the refrigerator of the showcase (10),
Third determination means for determining whether the frequency of the start / stop signal per unit time is within a predetermined threshold;
Further comprising
The internal set temperature determining means determines the average value of the effective internal temperature information when the third determination means determines that the frequency of the start / stop signal per unit time is within a predetermined threshold. determining a case of the internal set temperature <br/>-chamber set temperature estimation apparatus of the showcase according to claim 1. Fourth determination means for determining whether or not the number of rises and falls of the internal temperature per unit time is within a predetermined threshold;
Further comprising
The internal set temperature determining means determines an average value of the effective internal temperature information when the fourth determining means determines that the number of rises and falls of the internal temperature per unit time is within a predetermined threshold. Determined as the set temperature inside the showcase
The showcase internal set temperature estimation apparatus according to claim 1. The average value is a moving average value
The showcase internal set temperature estimation device according to any one of claims 1 to 5. The predetermined threshold varies according to the operating environment of the showcase (10).
The inside temperature setting apparatus for a showcase according to any one of claims 2 to 6. Provided far from the showcase (10),
The showcase internal set temperature estimation device according to any one of claims 1 to 7. A showcase internal temperature setting program (41) for estimating the internal temperature setting of the showcase (10),
Against the computer,
A storage room inside temperature information acquisition step temperature information Ru to acquire the showcase (10),
A defrost execution time information acquisition step for acquiring defrost execution time information (hereinafter referred to as “defrost execution time information”) performed in the showcase (10);
A specific internal temperature information removing step for removing internal temperature information corresponding to the defrost execution time information from the internal temperature information acquired by the internal temperature information acquisition means;
An average internal temperature information calculation step for obtaining an average value of internal temperature information that has not been removed by the specific internal temperature information removing means (hereinafter referred to as “effective internal temperature information”);
A set temperature determining step for determining the average value of the effective chamber temperature information as the set temperature in the showcase;
Showcase internal set temperature estimation program (41) for executing A method for estimating a set temperature in a showcase to estimate a set temperature in a showcase (10),
Against the computer,
An internal temperature information acquisition step of acquiring internal temperature information of the showcase (10);
A defrost execution time information acquisition step for acquiring defrost execution time information (hereinafter referred to as “defrost execution time information”) performed in the showcase (10);
A specific internal temperature information removing step for removing internal temperature information corresponding to the defrost execution time information from the internal temperature information acquired by the internal temperature information acquisition means;
An average internal temperature information calculation step for obtaining an average value of internal temperature information that has not been removed by the specific internal temperature information removing means (hereinafter referred to as “effective internal temperature information”);
A set temperature determining step for determining the average value of the effective chamber temperature information as the set temperature in the showcase;
This is a method for estimating the set temperature in the showcase of the showcase.

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