JP2010230275A - Cold storage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cold storage capable of uniformly cooling the inside of the storage for a long time and reducing energy cost by increasing a heat storage amount by applying a heat storage method utilizing midnight power and the like. <P>SOLUTION: The cold storage includes a storage body 12 receiving a stored object, a cooling pack 18 mounted in the storage body 12, and a resin pipe 22 for heat exchange which is disposed in the cooling pack 18 and in which brine such as the water of a prescribed temperature flows. Pipes 21 are disposed while being connected with both ends of the resin pipe 22, and led out to the outside of the cooling pack 18 and the storage body 12. The cooling pack 18 including a filling fluid is sealed up. The pipes 21 are connected to a refrigerating machine independent from the cold storage 10, and the brine of a prescribed temperature is circulated to the resin pipe 22 to freeze the filling fluid. The inflow of the brine is stopped, so that the stored object can be kept cold by the frozen filling fluid in the cooling pack 18. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a cold storage that cools the inside of the storage with ice.

  Conventionally, in the case of storing foods that need to be kept cold, a cool box equipped with a freezer is generally used. Moreover, there is a storage and an article transportation system disclosed in Patent Document 1. The storage of this patent document is provided with a storage body, a heat exchanger that cools or heats the interior of the storage with a heat medium, and a connecting means that allows the heat medium to flow continuously from the heat exchanger to a heat source device outside the storage. It has been. This heat exchanger is a planar body in which a large number of thin tubes are arranged close to each other along the inner side surface of the storage body. In the article transport system of this patent document, a heat source machine and a storage are first connected in a food factory or the like, a heat medium is introduced into a heat exchanger, and the interior is cooled or heated to a predetermined temperature. After the inside temperature has stabilized, put food, stop the inflow of the heat medium, remove it from the heat source machine, and transport the storage with the transport equipment such as trucks while maintaining the inside temperature. A heat source device is installed at a transportation destination such as a store, the transported storage is connected to the heat source device, a heat medium flows in, and the temperature is kept at a predetermined temperature and used as a cold storage for a store.

JP 2008-286485 A

  In the case of the above prior art, since the sensible heat of the heat medium is used, if the inflow of the heat medium is stopped for a long time, the temperature inside the cabinet rises and becomes close to the outside temperature, and the food cannot be kept cold. There is a fear. Moreover, it was not considered to reduce the cost of energy.

  This invention has been made in view of the problems of the background art described above, and by adopting a heat storage method using midnight power or the like, the amount of stored heat can be increased, the interior can be uniformly cooled for a long time, It aims at providing the cold storage which can hold down cost.

  The present invention relates to a storage body for storing an object to be stored, a cooling pack attached to the inside of the storage body, a pipe for heat exchange provided in the cooling pack and through which brine of a predetermined temperature flows. A pipe connected to both ends of the pipe and drawn from the cooling pack to the outside of the storage body, and a filling liquid sealed in the cooling pack, the refrigerator being separate from the cold storage After the connecting member is connected to circulate the brine at a predetermined temperature through the pipe to freeze the filling liquid, the inflow of the brine is stopped, and the container is cooled by the filling liquid in the cooling pack. It is a cold storage that is possible. The pipe is made of resin, and the filling liquid is water.

  The cooling pack is attached to each side surface of the storage body, is formed in a thin shape along the side surface, and the pipe is provided with a plurality of thin heat exchange pipes substantially parallel to the side surface. It is.

  Furthermore, the said cool box is separated from the said refrigerator, and is provided so that conveyance is possible.

  Even if the circulation of the brine is stopped, the cold storage according to the present invention can maintain the object to be stored at a low temperature by maintaining the cooling effect for a long time by the frozen filling liquid of the cooling pack, and has high energy saving performance. It can be transported easily while keeping it cool. It is possible to freeze the filling liquid at night by using inexpensive nighttime power, stop the circulation of the brine during the daytime, and reduce the cost.

It is a perspective view of the cool box of one embodiment of this invention. It is the perspective view (a) and side view (b) of the cooling pack of the cool box of this embodiment. It is a perspective view of the cover of the cooling pack of this embodiment. It is a front view which shows the resin pipe of other embodiment of this invention. It is a graph which shows the result of having measured the elapsed time immediately after a brine inflow, and the temperature change in a warehouse about the temperature of three types of brine of the cold storage which has the conventional heat exchanger. It is a graph which shows the result of having measured the elapsed time just after brine injection | pouring of the cool storage box of FIG. It is a graph which shows the elapsed time immediately after stopping the inflow of a brine, and the temperature change in a store | warehouse | chamber of the cool storage box of FIG. After the temperature change after the inflow of brine in the cold storage in FIG. 1 stabilizes, the time immediately after the inflow of the brine is stopped and the ice is placed in the upper part of the storage and the temperature change in the storage are measured for three types of ice weight and made dimensionless. It is a graph which shows the value which carried out. After the temperature change after the brine inflow in the cold storage in FIG. 1 stabilized, the time immediately after the brine inflow was stopped and the ice of the cooling pack was installed on the inner wall of the refrigerator and the temperature change in the refrigerator were measured for three types of ice weight. It is a graph which shows the value made dimensionless.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 4 show an embodiment of the present invention, and a cold storage 10 of this embodiment is a storage body 12 having a shape that can be cooled in a warehouse or a storage space or transported by a transport device such as a truck. Is provided. The storage body 12 has a rectangular upper surface 12a that is long in one direction, a bottom surface 12b that is the same shape as the upper surface 12a, a back surface 12c that is perpendicular to one of the short sides of the upper surface 12a, and a pair of long pieces of the upper surface 12a. A pair of side surfaces 12d and 12e continuous to each other is provided. The storage body 12 is provided with an opening 14 on one side surface, and an airtightly closing door 16 is provided in the opening 14 so as to be opened and closed. A heat insulating material (not shown) is attached to the inner peripheral surface of the storage body 12.

  A cooling pack 18 is provided on the inner peripheral surfaces of the side surfaces 12 d and 12 e of the storage body 12. The cooling pack 18 is covered with a rectangular bag body 20 made of a synthetic resin sheet such as a strong polyamide resin, and a heat exchange resin pipe 22 through which brine flows is provided inside the bag body 20. ing.

  The resin pipe 22 includes a supply-side main pipe 22a and a return-side main pipe 22b provided along the upper end portion of the cooling pack 18, and the cooling pack 18 is provided between the supply-side main pipe 22a and the return-side main pipe 22b. A heat exchanging pipe 22c, which is a plurality of thin tubes arranged in a U shape by being folded back at the lower end portion, is provided. Further, the supply-side main pipe 22a is provided with an inlet 23a for brine, which is a liquid heat exchange medium, and an outlet 23b for brine is provided at the end of the return-side main pipe 22b. The inflow port 23 a and the outflow port 23 b are connected to a pipe 21 that passes through the bag body 20 and the storage body main body 12 and is drawn to the outside of the storage body main body 12.

  A filling liquid 24 is sealed in the bag body 20 of the cooling pack 18. The filling liquid 24 is water, for example. A pair of the cooling pack 18 is provided on the side surface 12d and the side surface 12e of the storage body 12, and is slightly spaced apart from the side surface 12d and the side surface 12e and fixed in parallel. Further, the cooling pack 18 is covered with a cover 25 for preventing damage in the storage body 12.

  A reinforcing plate 26 is attached to the bottom surface 12 b of the storage body 12, and four casters 28 are provided at the corners of the reinforcing plate 26.

  Next, the usage method of the cool box 10 of this embodiment is demonstrated. First, when the cool box 10 is cooled, it moves to the vicinity of a refrigerator (not shown). Here, the refrigerator will be described. Inside the refrigerator, a tank for storing brine, a primary side cooling circuit for cooling the brine in the tank to a set temperature, and a pump for pumping the brine in the tank on the secondary side are provided. A brine outlet or a brine inlet leading to the tank is provided on each side of the refrigerator. Then, the pipe 21 on the cool box 10 side is connected to the brine outlet and the brine inlet of the refrigerator, respectively, and the brine is circulated through the resin pipe 22 of the cooling pack 18. Thereby, the filling liquid 24 in the cooling pack 18 is cooled to become ice, and the preparation is completed. Next, the pipe 21 on the cool box 10 side is removed from the refrigerator, the door 16 is opened, and an object such as food is placed therein, and the door 16 is sealed. In this state, the cool box 10 can be moved or transported. Ice cools the inside of the storage body 12 of the cold storage 10 and keeps the temperature low for a long time.

  According to the cool box 10 of this embodiment, the inside of the box can be kept uniformly at a low temperature for a long time with a simple structure, and further has the following effects. The inside of the storage body 12 can be maintained at around 5 ° C. for a long time without using electric power or the like by using the cold heat of the filling liquid 24 of the cooling pack 18. Since the cooling pack 18 is inside the pair of side surfaces 12d and 12e, the frozen filling liquid 24 directly absorbs intrusion heat from the outside of the warehouse, so that the low temperature can be efficiently maintained. Objects to be contained such as food can be kept at 5 ° C. or lower, and can be safely transported while suppressing the generation of bacteria and the increase of toxins. It is not necessary to connect to a freezer at all times, and energy saving performance is high. It is possible to freeze the filling liquid at night by using inexpensive nighttime electric power to store ice heat, stop the circulation of brine during the daytime, and reduce the cost. By using nighttime power, power consumption is leveled, which can contribute to effective use of energy. The cool box 10 is lightweight and convenient for movement, and the equipment during movement is simplified due to ice heat storage, and can be transported by a vehicle other than the cold storage car, and the transportation cost can be reduced. Since the cool box 10 is kept at a low temperature for a long time due to ice heat storage, it functions as a refrigerator, and when stored in the warehouse, the temperature of the entire warehouse is not required, and can be stored in a general warehouse without a temperature control function. . If a refrigerator is prepared in the warehouse, it can be connected to the cool box 10 to start the inflow of brine and continue cooling. The heat exchange pipe 22c of the cooling pack 18 is made of a synthetic resin and has a lower thermal conductivity than that of a metal one. However, the heat exchange pipe 22c freezes relatively uniformly over the entire heat exchange pipe 22, so that the heat efficiency is good.

  In addition, as shown in FIG. 4, the heat exchange pipe 22c of this embodiment can also be largely folded back in a U shape. In this case, a thicker heat exchange pipe can be accommodated. Further, the cooling pack 18 may be attached to the back surface 12c in addition to the side surfaces 12d and 12e of the storage body 12.

  About the heat insulation cooling effect by the cold storage of one Example of this invention, it verified experimentally using the cold storage which has the conventional heat exchanger. First, the cold storage used for experiment is demonstrated. This cold storage keeps the temperature from the base refrigerated warehouse to the transport destination, and has no refrigeration equipment in the main body. By arranging a heat transfer tube in the storage body of the cool box and connecting it to a refrigerator at the transport destination, it can be used as a simple refrigerator.

The size of the cool box is the outer dimensions W × H × D = 580 × 1500 × 810 mm, the volume is 477 l (480 × 1400 × 710 mm), and the average heat transmissivity of the wall is 80 W / m ³ K. The side walls and the like are made of 50 mm thick urethane foam (thermal conductivity 0.024 W / (mK)), a galvanium steel sheet exterior, and an aluminum sheet interior. The heat exchange pipe is a PP thin tube mat (inner diameter d = 2.3 mm, length l = 2800 mm, 31 on one side folded in half). This heat exchange pipe is installed on the left and right wall surfaces in the storage body of the cold storage.

  Next, the experimental apparatus and procedure will be described. First, brine is introduced into the heat exchange pipe to keep the inside temperature constant. After the inside temperature is stabilized, the inflow of brine is stopped and left for 4 hours. These temperature changes are measured for each condition. The temperature of the cool box is measured using a thermocouple (K type, conductor diameter 0.2 mm), with the thermocouple installed at 28 points. The measurement results are collected by a personal computer through a data logger.

  First, brine is introduced into the heat exchange pipe of the cold storage to cool the inside of the storage to a certain temperature. After the internal temperature stabilizes, stop the inflow of brine and measure the internal temperature rise. At the same time, it is confirmed whether the brine remaining in the heat exchange pipe works sufficiently as a heat storage material.

  5 and 6 are graphs showing the elapsed time immediately after the inflow of brine and the internal temperature change (the temperature in the parenthesis in the legend is an average of the outside air temperature). FIG. 5 shows the measurement of three kinds of temperature conditions of −5 ° C., 0 ° C., and 5 ° C. when brine is introduced at 2 l / min. According to this, for all three types of brine temperature conditions, the food safety management temperature falls below 10 ° C. at about 0.5 hr after the inflow of the brine, and the inside temperature is almost stabilized at 1.5 hr. FIG. 6 shows the measurement of -5 ° C. brine for three types of flow rate conditions of 1 l / min, 2 l / min, and 4 l / min. According to this, when the flow rate conditions of brine were 2 l / min and 4 l / min, the values were almost the same, and only when 1 l / min, the values were high. Therefore, it is estimated that the flow rate of brine is 2 l / min, which is the most efficient in cooling the inside of the warehouse.

  In this experiment, since the inside of the storage body is only air, the heat capacity is extremely small, and since the heat insulation of the storage body is high, there is almost no heat load, so there seems to be little difference due to the brine flow rate. If food is contained, the difference due to the brine flow rate will be clearer.

FIG. 7 shows the average value of the temperature change in the chamber after measuring the elapsed time and the temperature change in the cabinet immediately after stopping the inflow of the brine after the brine flowed in at 2 l / min, sufficiently cooled and the temperature change stabilized. It is a graph which shows the value made dimensionless by the following formula | equation (1).
_{1- (T ∞ -T) / (} T ∞ -T O) ... (1)

Here, T _∞ is the ambient air temperature, T _O is the initial temperature of the refrigerator. The temperature conditions of brine were measured for three types of −5 ° C., 0 ° C., and 5 ° C. According to this, although there is a slight difference depending on the temperature of the brine, there is almost no effect, the temperature rises to 0.8 at a dimensionless temperature, and it can not be said that the cold storage only with brine has sufficient cold storage capacity for food transport .

  Therefore, in addition to brine, ice as a cold storage material was installed in the upper part inside the storage body to suppress the temperature rise in the storage. FIG. 8 shows that after the temperature in the cabinet is cooled with brine under the same conditions as in the above-described experiment and the temperature change is stabilized, the inflow of brine is stopped and ice is installed in the upper portion of the cabinet. The temperature change is measured, and the value obtained by making the average value of the temperature change in the cabinet dimensionless by the equation (1) is shown. Here, the weight of ice was measured for three types of 2 kg, 6 kg, and 8 kg. According to this, it can be seen that the dimensionless temperatures of ice 2 kg, 6 kg, and 8 kg are in the range of 0 to 0.65. From the viewpoint of the food management temperature, it can be seen that there is a sufficient cooling capacity in the conveyance of food. However, it was also found that the internal temperature continued to rise gradually, and the latent heat of ice was not fully utilized.

  Next, ice was put into a thin container which is a cooling pack, and the same experiment was performed by arranging it uniformly on the side wall of the storage body. FIG. 9 shows that after cooling the inside temperature with brine under the same conditions as in the experiment of FIG. 8 and the temperature change is stabilized, the inflow of brine is stopped and a cooling pack consisting of a thin container containing ice is attached to the storage body. When 4 to 8 bags are evenly attached to a pair of side walls, the time elapsed immediately after that and the temperature change inside the chamber are measured, and the average value of the temperature change inside the chamber is shown as a dimensionless value by equation (1). Is. Here, the weight of ice was measured for two types of 8 kg and 2.4 kg. According to this, it was found that when the cooling pack was placed on the wall surface with the same amount of ice, the temperature rise in the cabinet was kept small, and a stable temperature was maintained for a long time. The reason for this is that when ice is installed in the upper center, the heat that enters from the outside of the warehouse is absorbed by the air inside the warehouse and is cooled by mixing with the air cooled on the surface of the ice, whereas the ice is This is probably because the ice directly absorbs the intrusion heat from the outside of the cabinet when it is on the side of the cabinet body.

  From the above, installing a cooling pack filled with water on the inner surface of the storage body, forming a resin heat exchange pipe through which brine flows in this cooling pack to form ice, and using that ice as a cold storage material, the effect Therefore, it was found that it was effective for maintaining a low temperature for a long time. If the position of the ice is evenly arranged on the side wall than the upper part of the storage body, it is efficient and the cooling effect is high. Moreover, sufficient capacity could be obtained with 2 l / min of brine and 2-8 kg of ice.

DESCRIPTION OF SYMBOLS 10 Cold storage 12 Storage body 14 Opening part 16 Door 18 Cooling pack 20 Bag body 21 Piping 22 Resin pipe 22a Supply side main pipe 22b Return side main pipe 22c Heat exchange pipe 24 Filling liquid 26 Reinforcement board 28 Caster

Claims (4)

  A storage body for storing the objects to be stored, a cooling pack attached to the inside of the storage body, a pipe for heat exchange provided in the cooling pack and through which a brine of a predetermined temperature flows, A pipe connected to both ends and drawn out of the main body of the storage from the cooling pack; and a filling liquid sealed in the cooling pack; and the connecting member is connected to the refrigerator separately from the cold storage. After connecting and circulating the brine at a predetermined temperature through the pipe to freeze the filling liquid, the inflow of the brine is stopped, and the contained object can be kept cool by the filling liquid of the cooling pack. A cold storage that features.   The cold storage according to claim 1, wherein the pipe is made of resin and the filling liquid is water.   The cooling pack is attached to each side surface of the storage body, is formed in a thin shape along the side surface, and the pipe is provided with a plurality of thin heat exchange pipes substantially parallel to the side surface. The cold storage according to claim 1. The said cool box is separated from the said refrigerator, and is provided so that conveyance is possible, The cool box of Claim 1, 2, or 3 characterized by the above-mentioned.

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