KR100774272B1 - Freezing control system and freezing control method for cold storage - Google Patents

Abstract

A method and a device for freezing control of a cold storage are provided to control a cooling part through discrimination between natural thermal loss and artificial cooling loads caused by entered items, and drive the cooling part considering estimated temperature rising in advance. A device for freezing control of a cold storage includes a distribution management part for carrying out distribution management for each storing chamber according to information on entered items, discharged items, and stored items, and a control part receiving the information on the entered items and controlling output of a cooling part for the storing chamber according to the information on the entered items. The information on the entered items includes weight data and name data of the entered items, and the control part stores humidity content data on the entered items.

Description

Cooling control system and freezing control method in refrigerated or cold storage warehouse {FREEZING CONTROL SYSTEM AND FREEZING CONTROL METHOD FOR COLD STORAGE}

1 is a conceptual diagram of a cooling control system and a logistics management system independently operated according to the prior art;

2 is a conceptual diagram of a refrigeration control system in which a logistics management system is integrated according to an embodiment of the present invention;

3 is a table showing the properties of various foods,

4 is a freezing curve of food.

-Korean Utility Model Registration No.0409696 "Remote monitoring and management system of frozen, refrigerated or cold distribution logistics warehouse"

-Domestic Patent Registration No. 10-0576556 "Computer readable recording medium recording a program for location management of a frozen or cold store"

-Korean Utility Model Registration No. 20-0407733 "Warehouse Logistics Management System for Refrigerated, Refrigerated or Cold Distribution Logistics Warehouse"

The present invention relates to a cooling control system and a cooling control method of a refrigeration or cold storage warehouse.

First, a cooling control system of a conventional refrigeration or cold storage warehouse will be described.

Frozen or refrigerated warehouses are used to freeze agricultural products, fisheries, livestock products, etc. (hereinafter referred to as "goods"), or to store frozen or unfrozen goods at a constant low temperature.

In addition, the cooling in the above and below is a concept including not only lowering the temperature within the range of not freezing the article, but also lowering the temperature of the frozen article, and freezing the article.

As shown in the left side of Figure 1, a conventional cooling control system is provided with a plurality of cooling units, the cooling unit is configured to cool the plurality of storage compartments. In addition, a control unit for controlling the cooling unit is provided.

The cooling section is usually composed of a refrigeration cycle consisting of a compressor-> condenser-> expansion valve-> evaporator-> compressor, the configuration of such a cooling section is well-known technology.

The control unit maintains each storage chamber at an appropriate temperature by driving the cooling unit, or in some cases, performs a process such as rapid freezing.

Meanwhile, the control method or the control system of the conventional cooling unit controls the cooling unit to lower the storage chamber to a predetermined temperature after the controller senses the temperature of the storage chamber by a temperature sensor provided in the storage chamber.

The conventional automatic control method or automatic control system is basically only a method of turning on and off the driving of the cooling unit, and does not change the driving output of the cooling unit.

The output of the cooling unit above and below means how much heat per unit time can be taken from the object to be cooled. Similar to the output of the cooling unit, refrigeration ton (RT) is also used. Freezing ton means the amount of heat that can be frozen per unit time, and the freezing capacity to make 1 ton of water at 0 ° C into 0 ° C ice in 24 hours is called 1 freezing ton (RT). That is, since the latent heat of coagulation of water is 79.68 kcal / kg, one frozen ton can be expressed as follows.

1 RT = 79.68 x 1,000 / 24 = 3320 kcal / h

As described above, in the case of driving the on-off cooling unit according to the conventional temperature sensing, the following problems occur.

(1) Goods received in refrigerated or frozen warehouses should be stored at an appropriate temperature, and a certain time is required for the storage room to cool to an appropriate temperature. The cooling time also varies with the amount of article received.

For example, even when the difference between the current temperature of the storage compartment and the proper temperature of the storage compartment is 10 ° C., the cooling time varies depending on how many items are stored in the storage compartment.

In addition, longer cooling times have a significant impact on the quality of goods received (eg freshness). Therefore, it is necessary to reduce the cooling time required to cool the temperature of the storage room to a constant temperature, but by the conventional method by the storage room temperature detection it was not able to find a variable itself that can change the output of the cooling unit.

(2) When goods are received or released from a refrigerated or cold storage warehouse, the door of the storage room is inevitably opened. Thus, when the door of the storage room is opened, heat loss occurs through this. However, in the case of the conventional cooling control method by sensing the temperature of the storage compartment, the sensing unit temperature is sensed to rise above a certain temperature, and then the cooling unit is driven to generate a time interval therebetween. It is already raised (when the door is opened) and then lowered again (when the cooling unit is driven), which causes a deterioration of the quality of the received goods.

(3) As shown in FIG. 4, the freezing curve of the food passes through the sensible heat removal process above 0 ° C, the latent heat removal process near 0 ° C (that is, the maximum ice crystal generation zone), and the maximum ice crystal generation zone. It consists of removing the sensible heat of the article.

At this time, the outer periphery, the middle part and the center part of the article are frozen in different curves, but the latent heat removal process (ie, the maximum ice crystal generation zone) near 0 ° C takes a considerable time. How fast it passes will have the greatest impact on the quality of the frozen article.

In addition, it is desirable to control the graph curves of the three outer periphery, the middle, and the central portion to coincide. That is, it is very important to keep the quality of the product in the best state by minimizing the destruction of tissue by ensuring that the degree of freezing of all parts of the article is consistent.

In addition, since the temperature of the article does not drop in the latent heat removal process near 0 ° C., in the case of the conventional cooling unit control system, the temperature of the storage compartment does not fall properly even though the cooling unit is driven. .

(4) In the case of the conventional cooling control system by temperature sensing, it is not possible to distinguish between a rise in temperature due to heat loss that occurs even when the refrigerated or refrigerated warehouse is sealed, and an artificial heat loss due to a work of receiving goods.

On the other hand, domestic registered utility model No. 0409696 "Remote monitoring and management system of refrigerated, refrigerated or cold distribution logistics warehouse" filed and registered by the present applicant is connected to the warehouse-specific control device for controlling the cooling unit and the communication network It has been shown that it is possible to manage a refrigerated or refrigerated warehouse remotely through a management server, and this prior art is considered to be incorporated herein.

Of course, the control unit for controlling the cooling unit may be connected to a terminal by a LAN or the like to monitor the driving state of the cooling unit.

On the other hand, as shown on the right side of Figure 1, in the case of a conventional freezer or cold storage warehouse has been in operation for managing the information of the goods stored in the storage room and the goods shipped from the storage room, and the currently stored storage items. .

In other words, information about each storage room, goods that are to be received, goods that are in stock, goods that are in storage, goods that are shipped, etc. are stored in a database in a computer and managed.

Korean Patent Registration No. 10-0576556, filed and registered by the present applicant, "Computer-readable recording medium recording a program for location management of a refrigerated or cold storage warehouse", Korean Utility Model Registration No. 20-0407733 "Frozen, Warehouse logistics management system for refrigerated or cold distribution logistics warehouse "and the like are described for such a logistics management unit, these prior art is considered to be incorporated herein.

This logistics management unit has been operated completely separate from the cooling control system, as shown in FIG.

The present invention is to improve the cooling control system of the prior art as described above simply made by the temperature sensing of the storage room, active cooling control by introducing the information variable of the goods to the control unit for controlling the cooling unit to control the cooling unit Aims to make it possible.

In order to solve the above problems, the present invention, in the refrigeration or refrigeration control system of the refrigeration or refrigerating warehouse consisting of a cooling unit for cooling the storage compartment of the refrigeration or refrigerated warehouse, and a control unit for controlling the cooling unit: information of goods received, shipping Logistics management unit is added to perform the logistics management of each storage room through the information of the goods and the information of the stored goods; The control unit is configured to receive at least the information of the goods received from the logistics management unit through this to control the output of the cooling unit to the storage room; It is characterized by.

In the above, the information of the goods to be delivered to the control unit preferably comprises at least weight information of the goods.

In the above, the information of the goods to be delivered to the control unit further includes name information of the goods, the water content information for the goods stored in the control unit is stored, the control unit the goods received It may be made to control the output of the cooling unit to the storage room through the information and the corresponding water content information.

The information of the goods received to the control unit further includes name information of the goods, the freezing point (freezing temperature) information, specific heat information and latent heat information for the goods stored in the control unit is stored The controller may be configured to control the output of the cooling unit to the storage room through the information of the received goods and the specific heat information and latent heat information corresponding thereto.

According to another aspect of the present invention, in a method for controlling a cooling unit in which a control unit of a refrigerating or refrigerating warehouse cools a storage compartment of a refrigerating or refrigerating warehouse, when the information of the received goods received in the storage compartment is input to the control unit, the control unit Is characterized in that for controlling the output of the cooling unit for the storage compartment in which the incoming goods are received through the information of the incoming goods.

In the above, the information of the goods received into the control unit is preferably input from the logistics management unit that performs the logistics management of each storage room through the information of the goods received, the information of the goods and the storage goods.

Hereinafter will be described in detail the configuration and operation according to an embodiment of the present invention.

2 is a conceptual diagram of a refrigeration control system in which the logistics management unit is integrated into a control unit according to an embodiment of the present invention, and FIG. 3 is a table showing the properties of various foods that are subject to a received article.

As shown in FIG. 2, in this embodiment, the control unit receives the information of the received goods, the information of the stored goods, and the information of the goods shipped from the logistics management unit, and the control unit receives information on the storage room through the received goods. The output of the cooling unit is controlled.

The configuration of the logistics management unit itself may be applied in the same manner as the configuration of the conventional logistics management unit, and the configuration of the control unit and the cooling unit may also be applied in the same manner.

However, in the present embodiment, when the control unit controls the cooling unit, the controller receives the information of the goods received from the logistics management unit, and considers this when controlling the cooling unit.

Of course, the control unit may receive the information of the goods received and the information of the stored goods as well as the information of the goods received from the logistics management unit may reflect these information in controlling the cooling unit.

At this time, it is preferable that at least the weight information of the goods to be received is included as information on the goods to be delivered to the controller.

Instead of the weight information of the goods received, corresponding information may be transmitted to the controller. This information may correspond to the weight information of the goods received, such as information on the amount of water, or information about the volume, information about the pallet number.

The case where only the weight information of the received goods is transmitted as the information of the received goods.

The weight information of the received goods not only determines the cooling load but also serves as a measure of the time for opening the door of the storage compartment.

As shown in FIG. 3, factors that determine specific heat, latent heat, and the like of various articles are basically related to moisture content included in the article, and the water content is approximately 95% to 65%. Of course, the moisture content can be estimated in a very narrow range when the type of goods stored in the frozen or cold store is specified. For example, aquatic products can be estimated to have a moisture content of 65% to 85%. Therefore, as a cooling load, assuming a water content of 85%, this can be applied to the load calculation.

In other words, when 100 tons of aquatic products are received, it can be estimated that 85 tons (100 to x 85%) of water is received by considering the moisture content as 85%. Therefore, the cooling load required for cooling 85 tons of water to a certain temperature is Can be calculated. In this case, the cooling load may be regarded as 0 ° C., and the cooling load required for cooling to a specific temperature may be calculated through specific heat above the freezing point, specific heat below the freezing point, and latent heat at the freezing point. .

In addition to the calculation of the cooling load, this information can be used as information to confirm the state of the goods currently in stock through the temperature sensing of the storage room. That is, even when the cooling unit is being driven, if the temperature of the storage room is stagnant or very slowly descending around 0 ° C, it should be judged that it is passing the vicinity of the freezing point and not the malfunction of the machine. You need to raise it.

In addition, the opening time of the storage doors required for the storage of 100TON fishery products can be calculated by experience, and the heat loss according to the opening time of the storage doors can also be calculated.

Therefore, the total cooling load can be calculated as the sum of the amount required to cool 100 tonnes of aquatic products and the amount due to the opening of the door.

In this way, when the control unit calculates the cooling load through the information of the received goods, particularly the weight information, the control unit adjusts the output of the cooling unit according to the calculation result. In particular, the control unit may control the cooling unit by simultaneously using the information of the goods and the storage room temperature by simultaneously performing the temperature sensing of the storage room as in the prior art.

That is, the control unit can control the cooling unit while distinguishing between a general heat loss generated in the storage of a normal article and a cooling load artificially generated according to the receipt of the article.

Therefore, the control unit may minimize the output of the cooling unit to the storage compartment when it corresponds to the general heat loss generated during the storage of a normal article, and may be controlled by increasing the output of the cooling unit to an artificial cooling load according to the receipt of the article. .

In addition, the control unit maximizes the output of the cooling unit to the storage compartment, especially at a freezing point below 0 ° C., so that the incoming goods go through the freezing point as quickly as possible, thereby improving the quality of the freezing goods. Can be.

On the other hand, various methods are already known as a method of changing the output of the cooling unit.

For example, as a method for changing the output of the cooling unit, a control method on the compressor side is widely used, which controls the number of compressor operations, changes the rotational speed of the compressor, controls the evaporation gas pressure as an evaporation pressure regulating valve, or As a pressure regulating valve, the method of controlling intake gas pressure, using a multi cylinder compressor, etc. are known.

It is also possible to adjust the output of the cooling unit by adjusting the condenser capacity of the condenser or by manipulating the opening and closing of the electronic expansion valve.

As described above, according to the present invention, the control unit may appropriately adjust the output of the cooling unit through the information of the received goods.

However, the present cooling control system and the cooling control method may allow more sophisticated operation by additionally introducing other variables in addition to the weight information of the received goods.

For example, the information of the outgoing goods is used as a measure of the time when the door of the storage room is opened when the goods are shipped, so that the operation corresponding to the heat loss due to the opening of the storage room can be performed.

In addition, the information of the stored article can be controlled so that the cooling unit does not operate even when the temperature of the storage chamber rises for the empty storage chamber.

To this end, it is sufficient to configure the information of the outgoing article and the information of the stored article to be transferred from the logistics management unit to the control unit, and to set such control logic in the control unit.

In addition to the weight information, the name information, moisture content information, specific heat information, and latent heat information of the article may be used as the information of the article.

Such information may be stored in the control unit or the logistics management unit in the form of a database as shown in FIG.

Examine the case where such information is stored in the control unit.

If the name information of the various goods and the water content information of the corresponding goods are stored in the control unit, when the name information and the weight information of the goods are transmitted from the logistics management unit to the control unit, the control unit determines the water content information of the goods through the name information of the goods. The cooling unit may be controlled by calculating a cooling load from the weight information and the moisture content information of the article accordingly.

As another method, if the name information of various goods, specific heat information and latent heat information of the goods are stored in the control unit, when the name information of the goods and the weight information thereof are transmitted from the logistics management unit to the control unit, the control unit stores the information through the name information of the goods. The cooling unit may be controlled by retrieving specific heat information and latent heat information of the article and calculating a cooling load from the weight information and specific heat information and latent heat information of the article.

On the other hand, it can also be assumed that the moisture content information, specific heat information, latent heat information of various items are stored in the logistics management unit.

In this case, the goods receipt information delivered to the control unit may be a direct cooling load, and the control unit may control the cooling unit through the received cooling load.

However, when comparing the name and weight of the specific goods to the control unit, considering that the control unit is monitored through a terminal connected via LAN or WAN, even if the cooling load is calculated directly by the logistics department, It would be desirable to have the weight delivered to the control. Therefore, the operator who controls the cooling unit can monitor the state of the cooling unit while considering the information of the goods received.

The present invention, as mentioned in the prior art, may be implemented so that the control unit is remotely monitored, and not only the logistics management of the storage unit, but also the logistics room by dividing the storage room into a specific area based on any area within the storage room. Management can be performed. This point is one of various forms in which the present invention can be used irrespective of the features of the present invention, and the present invention can be used in various forms.

In addition, the above embodiment is only a preferred embodiment of the present invention, the technical spirit of the present invention can be variously modified or adjusted by those skilled in the art. Such modifications and adjustments fall within the scope of the present invention if they use the technical idea of the present invention.

As described above, the present invention can control the cooling unit by dividing the artificial cooling load caused by the natural loss of heat and the goods received in the refrigerated or refrigerated warehouse, so that the energy can be efficiently used as well as the goods stored and stored Can improve the quality.

In addition, the present invention compared to the conventional control method of the cooling unit by the temperature sensing, while the conventional control method of the temperature sensing is a following control method in that the cooling unit is driven after the temperature rise, while the present invention is in advance before the temperature rise It can be used in a prior control manner in that it can drive the cooling section in anticipation of the temperature rising.

In particular, the present invention, in the case of the article that needs to undergo a freezing process in the storage room, passes through the maximum freezing point generation zone very quickly, and also allows the outer periphery, the middle, and the center of the freezing item to freeze by drawing a graph where possible, Can improve the quality of frozen products.

Claims (9)

In the refrigeration control system of the refrigerating or cold storage warehouse comprising a cooling unit for cooling the storage compartment of the freezing or cold storage warehouse, and a control unit for controlling the cooling unit: Logistics management unit which carries out logistics management of each storage room through the information of goods received, the information of goods shipped and the information of goods stored, is added; The control unit is configured to receive at least the information of the goods received from the logistics management unit through this to control the output of the cooling unit to the storage room; Cooling control system of the refrigeration or cold storage. The method of claim 1, Cooling control system of the refrigerated or refrigerated warehouse, characterized in that the information of the goods received delivered to the control unit comprises at least weight information of the goods received. The method of claim 2, The information of the goods received by the control unit further includes name information of the goods received, The water content information for the goods received in the control unit is stored, The control unit is a refrigeration control system of a refrigerated or refrigerated warehouse, characterized in that for controlling the output of the cooling unit to the storage room through the information of the received goods and the water content corresponding thereto. The method of claim 2, The information of the goods received by the control unit further includes name information of the goods received, Specific heat information and latent heat information for the goods received are stored in the controller, The control unit is a cooling control system of the refrigeration or refrigerated warehouse, characterized in that for controlling the output of the cooling unit to the storage room through the information of the goods received and corresponding non-heat information and latent heat information. In the method of the control unit of the freezing or cold storage warehouse for controlling the cooling unit for cooling the storage compartment of the freezing or cold storage warehouse, When the information of the goods received in the storage room is input to the control unit, The control unit is a refrigeration control method for a refrigeration or cold storage, characterized in that for controlling the output of the cooling unit to the storage compartment in which the incoming goods are received through the information of the incoming goods. The method of claim 5, Information of the goods received in the control unit, Cooling control method for a refrigerated or refrigerated warehouse, characterized in that the input from the logistics management unit performing the logistics management of each storage room through the information of the goods received, the information of the goods shipped and the goods stored. The method of claim 6, Cooling control method for a refrigeration or cold storage, characterized in that the information of the goods received input to the control unit comprises at least the weight information of the goods received. The method of claim 7, wherein The information of the goods received by the control unit further includes name information of the goods received, The water content information for the goods received in the control unit is stored, The control unit is a refrigeration control method for a refrigeration or cold storage, characterized in that for controlling the output of the cooling unit to the storage room through the information of the incoming goods and the corresponding water content information. The method of claim 7, wherein The information of the goods received by the control unit further includes name information of the goods received, Specific heat information and latent heat information for the goods received are stored in the controller, The control unit is a refrigeration control method for a refrigerated or refrigerated warehouse, characterized in that for controlling the output of the cooling unit to the storage room through the information of the goods received and corresponding non-heat information and latent heat information.

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