JPH05631B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ice thermal storage type low temperature storage facility that utilizes the space within a bedrock.

``Conventional technology'' Conventional ice thermal storage type low temperature storage has a structure in which an ice making pit is installed in an above-ground building, ice is made using a refrigerator late at night when electricity is cheap, and the inside of the storage is maintained at a low temperature using this cold storage thermal energy. are known.

"Problems to be solved by the invention" In the conventional ice thermal storage type cold storage mentioned above,
It has the following drawbacks, and solutions are desired.

(b) The building must have an insulating structure, and at the same time, the ice making pit must also have an insulating structure to reduce heat loss in the ice making pit, which results in a high initial cost.

(b) Because it is an above-ground building, disturbance heat load fluctuations are large, making it complicated to control ice thermal storage energy and energy for direct cooling or heating to prevent overcooling in the harsh winter months.

"Means for Solving the Problems" The ice thermal storage type in-rock low-temperature storage according to the present invention uses a space in the bedrock which is relatively low temperature throughout the year as a storage location, and has an ice making pit and an ice making pit inside this space in the bedrock. A heat exchanger is provided, and a refrigerator is provided outside the rock interior space to supply brine to the ice making pit and the heat exchanger through valves, respectively, and a cold water circulation system that circulates the cold water in the ice making pit to the heat exchanger. A system has been established.

"Operation" In the above-mentioned in-rock low temperature storage, the water in the ice making pit is frozen by operating the valve to supply brine from the refrigerator to the ice making pit. Then, the air inside the refrigerator is cooled by supplying the cold water to the heat exchanger through the cold water circulation system within the ice making pit. Furthermore, the inside of the refrigerator can be cooled more rapidly by operating the valve to directly supply brine to the heat exchanger.

"Example" An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows the overall structure of the in-rock low-temperature storage storage according to the embodiment, and reference numeral 1 in the figure indicates a space in the rock that serves as a storage location. An ice making pit 2 is provided inside this rock space 1, and a heat exchanger 3 is provided on the ceiling inside the space. These ice making pit 2 and heat exchanger 3
brine is supplied from a refrigerator 4 provided outside the rock space 1. 5 is the brine circulation system, and ice making pit 2
route 5a passing through the heat exchanger 3 and route 5b passing through the heat exchanger 3
are connected in parallel within this circulation system 5, and both routes 5
Valves 6 and 7 for opening and closing each route are provided on the forward route sides of a and 5b, respectively. The water in the pit 2 is turned into ice by circulating the brine through the ice making pit 2 by the pump 8, and the inside of the refrigerator is cooled by circulating the brine through the heat exchanger 3.

Further, a cold water circulation system 9 is provided between the ice making pit 2 and the heat exchanger 3 for supplying cold water in the ice making pit 2 to the heat exchanger 3. 10 is a pump in the cold water circulation system 9. In addition, ice making pit 2
The amount of ice inside is set to be around 10% to 30% of the total, and the remainder is made to circulate cold water.

By the way, the heat exchanger 3 has two systems of heat exchange pipes so that cold water and brine can flow through each, and is configured as shown in FIGS. 2 and 3.

Reference numeral 11 in these figures is a casing, and this casing 10 has an upper plate 11a and a lower plate 11b spaced apart from each other, and a plurality of air intake ports 1 in the lower plate 11b.
2. Air exhaust ports 13 are provided on both side surfaces between the upper plate 11a and the lower plate 11b, and the space between the upper plate 11a and the lower plate 11b serves as an air flow path.
The air intake port 12 is equipped with a fan 15 driven by a motor 14 attached to the lower surface of the upper plate 11a. By driving the fan 15, the air taken in from the air intake port 12 is transferred to the air outlet 1.
Flows in one direction as shown by the arrow toward outlet 1.
It is designed to be sent to the outside from 3.

Two systems of heat exchange pipes are arranged in the flow path through which the air flows as follows. That is, a heat exchange pipe 16 for passing cold water is arranged on the upstream side of the air flow (on the air intake port 12 side), and a heat exchange pipe 17 for passing the brine on the downstream side (on the air outlet 13 side). These heat exchange pipes are arranged across the entire cross section of the air flow path, so that heat exchange between the flowing air and the fluid in the heat exchange pipes 16, 17 is effectively performed. . Further, the heat exchange pipes 16 and 17 are concentrated in a header for each system, and are connected to the circulation systems 9 and 5 for each system. In FIG. 3, 18 is a brine inlet connection port, 19 is a brine outlet connection port, 20 is a cold water inlet connection port, and 21 is a cold water outlet connection port.

Next, the operation of the ice thermal storage type in-rock storage constructed as above will be explained.

Normally, when using deep liquid with low electricity costs, the refrigerator 4 is operated, valve 6 is opened, valve 7 is closed, brine is supplied to the ice making pit 2, and ice is made until a predetermined amount of ice is reached. At this point, make sure that the temperature inside the refrigerator reaches the set temperature (2° to 3°).
℃), the cold water in the ice making pit 2 may be supplied to the heat exchanger 3 to cool down the inside of the refrigerator. Ice making is stopped, brine is supplied to the heat exchanger 3, and the inside of the refrigerator is directly cooled by the brine.

During the day, the cold storage energy stored as ice in the ice making pit 2 is used to supply the cold water in the ice making pit 2 to the heat exchanger 3 to cool the inside of the refrigerator. Therefore, the refrigerator 4 can be stopped during daytime hours when electricity rates are high.

By the way, in the process of shifting from daytime to deep liquid, the cold storage heat energy in the ice making pit 2 may be used up. In such a case, even if the cold water in the ice making pit 2 is circulated through the heat exchanger 3, the temperature of the cold water is not low enough to keep the inside of the refrigerator at a low temperature. Therefore, in such cases, or when high-temperature stored items are placed in the refrigerator, the circulation of cold water is stopped, the refrigerator 4 is operated, and the valve 6 is closed.
supplying brine to the heat exchanger 3 by opening valve 7;
Cool the inside of the refrigerator directly with brine. By doing so, the inside of the refrigerator is rapidly cooled down to a constant low temperature (2°~
3℃).

In the heat exchanger 3, as shown in FIGS. 1 and 2, air is taken in from the lower center as shown by the arrow and is discharged from the sides as cooling air.
Cool air circulates inside the refrigerator along the walls. Furthermore, when brine is supplied to the heat exchanger 3 for direct cooling, there is a concern that the cold water in the other heat exchange pipe 16 may freeze. Cold water heat exchanger pipe 1
Since it is arranged downstream of the airflow from 6, there is no risk of this happening.

"Effects of the Invention" According to the ice thermal storage type in-rock low temperature storage of the present invention,
The following effects can be obtained.

(a) The rock that makes up the space inside the bedrock has the effect of storing heat and cold, so there is no need for a particularly insulating structure to construct the storage space, and the ice making pit can also be installed directly in the bedrock, so no heat insulating structure is required. Therefore, it is possible to reduce the initial cost.

(b) The disturbance heat load in the space inside the rock mass is almost constant, and since the space inside the rock mass is only cooled, it is only necessary to constantly circulate brine and cold water, so control is easy.

(c) The heat exchanger can be supplied not only with cold water but also with brine from the refrigerator.
Even when the cold storage thermal energy of ice is so low that the cooling effect of cold water can no longer be expected, backup operation can be performed by supplying brine.

(d) When brine is supplied to the heat exchanger, a high cooling effect can be achieved, making it possible to perform emergency cooling when the temperature inside the refrigerator rises, making it possible to maintain the inside of the refrigerator at a constant low temperature. .

(e) Since it is possible to select whether to supply brine to the heat exchanger or to the ice making pit by operating a valve, the refrigerator can be used effectively.

(f) Since cold water and brine can be supplied to one heat exchanger, equipment costs are lower than when separate heat exchangers are provided for cold water and brine.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is an overall configuration diagram, FIG. 2 is a side sectional view of a heat exchanger, and FIG. 3 is a view taken along the - arrow in FIG. 2. 1... Space inside the bedrock, 2... Ice making pit, 3...
Heat exchanger, 4... Refrigerator, 5... Brine circulation system, 6, 7... Valve, 8, 10... Pump, 9...
Cold water circulation system, 16...Cold water heat exchange pipe, 17
...Heat exchange pipe for brine.

Claims (1)

[Claims] 1. An ice making pit and a heat exchanger are installed inside the rock space used as a storage space, and a refrigerator is installed outside the rock space to supply brine to the ice making pit and heat exchanger through valves, and the above-mentioned An ice thermal storage type in-rock low-temperature storage facility characterized by being provided with a cold water circulation system for circulating the cold water in the ice making bit to the heat exchanger.