JPH0474630B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a heat exchanger for ice storage type cold storage.

``Conventional technology'' Conventional ice thermal storage type low-temperature storage has an ice making pit inside the warehouse, and uses a refrigerator to turn the water in the ice making pit into ice late at night when electricity is cheap, and uses this cold storage thermal energy to lower the temperature inside the warehouse. It is of a structure that holds
The heat exchanger installed inside the refrigerator is of a type that circulates only cold water.

``Problem to be solved by the invention'' In the above case, it is good when there is plenty of cold storage thermal energy in the ice making pit, but it is used up from daytime to late at night, and the cooling effect inside the icebox decreases. There's a problem.

The present invention provides a heat exchanger that makes it possible to maintain a high internal cooling effect even when the cold storage thermal energy in the ice making pit decreases.

"Means for Solving the Problems" The heat exchanger of the present invention includes a fan that generates a unidirectional air flow from the air intake port to the air outlet, and an air flow between the air intake port and the air outlet. It has two systems and a heat exchange pipe arranged respectively on the upstream side and downstream side of the air flow in the flow path, and the upstream heat exchange pipe receives cold water from a cold water source, and the downstream side receives cold water from a cold water source. Brine is supplied to the heat exchange pipe from a refrigerator.

"Embodiment" Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

1 and 2 show a heat exchanger of an embodiment,
In the figure, 1 is a casing. The casing 1 has an upper plate 1a and a lower plate 1b spaced apart from each other, a plurality of air intake ports 2 on the lower plate 1b, and air exhaust ports 3 on both sides between the upper plate 1a and the lower plate 1b. The space between the upper plate 1a and the lower plate 1b serves as an air flow path. The air intake port 2 is equipped with a fan 5 driven by a motor 4 attached to the lower surface of the upper plate 1a, and by driving the fan 5, the air taken in from the air intake port 2 is sent to the air outlet 3. The liquid flows in one direction as shown by the arrow, and is sent out from the discharge port 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 6 for passing cold water is arranged on the upstream side of the air flow (air intake port 2 side), and a heat exchange pipe 7 for passing brine on the downstream side (air discharge port 3 side). There is. These heat exchange pipes 6 and 7 are arranged across the entire cross section of the air flow path, and here, heat exchange between the flowing air and the fluid in the heat exchange pipes 6 and 7 is effectively performed. There is. Further, each heat exchange pipe 6, 7 is concentrated in a header for each system, so that each system can be connected to a cold water circulation system and a brine circulation system. 8 to 11 are connection ports for this purpose, 8 is a brine inlet connection port, 9 is a brine outlet connection port,
10 is a cold water inlet connection port, and 11 is a cold water outlet connection port.

Next, an ice thermal storage type in-rock low temperature storage to which this heat exchanger is applied will be explained.

FIG. 3 shows the overall structure of the storage, and reference numeral 12 in the figure indicates a space within the bedrock that serves as a storage location. An ice making pit 13 is provided inside this rock space 12, and a heat exchanger 14 of the present invention is provided on the interior ceiling. Brine is supplied to the ice making pit 13 and the heat exchanger 14 from a refrigerator 15 provided outside the rock space 12. 16 is the brine circulation system,
Route 16a passing through ice making pit 13 and heat exchanger 1
A route 16b passing through 4 is connected in parallel within this circulation system 16, and valves 17 and 18 are provided on the outbound side of both routes 16a and 16b to open and close the routes, respectively. The water in the pit 13 is turned into ice by circulating the brine through the ice making pit 13 by a pump 19, and the interior of the refrigerator is cooled by circulating the brine through a heat exchanger 14.

Furthermore, a cold water circulation system 20 is provided between the ice making pit 13 and the heat exchanger 14 for supplying cold water in the ice making pit 13 to the heat exchanger 14.
21 is a pump in the same system. Note that the amount of ice in the ice making pit 13 is set to be about 10% to 30% of the total, and the remaining cold water is circulated.

This ice thermal storage is operated as follows.

Normally, the refrigerator 15
is operated, valve 17 is opened and valve 18 is closed, brine is supplied to ice making pit 13, and ice is made until a predetermined amount of ice is reached. Here, if the temperature inside the refrigerator reaches the set temperature (2° to 3°C) or higher, the cold water in the ice making pit 13 may be supplied to the heat exchanger 14 to cool the inside of the refrigerator. Close valve 17, close valve 18
is opened to temporarily stop ice making, and brine is supplied to the heat exchanger 14 to directly cool the inside of the refrigerator with the brine.

During the day, the cold storage energy stored as ice in the ice making pit 13 is used to supply the cold water in the ice making pit 13 to the heat exchanger 14 to cool the inside of the refrigerator. Therefore, the refrigerator 15 can be stopped during daytime hours when electricity rates are high.

By the way, in the process of transition from daytime to late night, the cold energy stored in the ice making pit 13 may be used up. In such a case, even if the cold water in the ice making pit 13 is circulated through the heat exchanger 14, the inside of the refrigerator cannot be kept at a low temperature because the temperature of the cold water is not low. Therefore, in such a case, or if high-temperature stored items are placed in the refrigerator, the circulation of cold water is stopped, the refrigerator 15 is operated, and the valve 17 is turned on.
is closed, valve 18 is opened to supply brine to heat exchanger 14, and the inside of the refrigerator is directly cooled by brine.
By doing so, the inside of the refrigerator is rapidly cooled and kept at a constant low temperature (2° to 3°C).

In the heat exchanger 14, 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. In addition, when brine is supplied to the heat exchanger 14 for direct cooling, there is a concern that the cold water in the other heat exchange pipe 6 may freeze. Since it is arranged on the downstream side of the air flow from the cold water heat exchange pipe 6, there is no possibility of this happening.

"Effects of the Invention" As explained above, the heat exchanger of the present invention can exhibit a cooling effect even if brine or cold water is supplied. In a regenerator type low temperature storage, backup operation can be performed by supplying brine even when the temperature of the cold water becomes so high that a cooling effect cannot be expected. In addition, when brine is supplied directly 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. .

In addition, since the heat exchange pipe through which the cooling water flows is arranged on the upstream side of the air flow than the heat exchange pipe for brine, the cold water does not freeze inside the pipe during the cooling operation using the brine.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a heat exchanger according to an embodiment of the present invention, FIG. 2 is a view taken along the - arrow in FIG. It is an overall configuration diagram of a low temperature storage. 1...Casing, 2...Air intake port, 3...
Air outlet, 5...Fan, 6...Cold water heat exchange pipe, 7...Brine heat exchange pipe, 14...
...Heat exchanger of the present invention.

Claims (1)

[Claims] 1. A fan that generates a unidirectional air flow from the air intake to the air outlet, and a fan located in the air flow path between the air intake and the air outlet on the upstream and downstream sides of the air flow, respectively. It is characterized by having two systems of heat exchange pipes arranged in parallel, with the upstream heat exchange pipe being supplied with cold water from a cold water source, and the downstream heat exchange pipe being supplied with brine from a refrigerator. Heat exchanger for ice storage type cold storage.