JPH05322396A - Ice heat accumulating device - Google Patents

Abstract

PURPOSE:To handle a large cold heat load and improve the efficienty of a refrigerating machine as well as the heat accumulating efficiency of an ice heat accumulating tank. CONSTITUTION:Changeover valves 35, 36, 37, 38, 41, 43 are switched in accordance with a cold water temperature at the outlet port of an ice heat accumulating tank 12, the degree of the load of a cold heat load 19 and the like whereby an subcooler 8 and the cold heat load 19 are connected in series and/or in parallel to the ice heat accumulating tank 12 while changing the order of them or independently respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ice heat storage device used for air conditioning and district heating and cooling.

[0002]

2. Description of the Related Art One example of a conventional ice heat storage device is shown in FIG. The refrigerant gas discharged from the compressor 3 enters the condenser 2, where it radiates heat to the cooling water flowing in the heat transfer tube 2a to be condensed and liquefied. This refrigerant liquid enters the evaporator 1 via the refrigerant flow rate controller 4, where it absorbs heat from brine such as ethylene glycol flowing in the heat transfer tube 1a to be evaporated and vaporized and returned to the compressor 3.

The cooling water, which has been heated by absorbing heat from the refrigerant in the heat transfer tube 2a of the condenser 2, enters the cooling tower 5 where it is radiated to the atmosphere to be cooled. Then, it is urged by the cooling water pump 6 and circulates again to the heat transfer tube 2 a of the condenser 2.

The brine cooled by exchanging heat with the refrigerant in the heat transfer tube 1a of the evaporator 1 enters the subcooler 8 where the cold water flowing in the heat transfer tube 8a is supercooled to raise the temperature. After that, it is energized by the brine pump 9 and circulates again to the heat transfer tube 1a of the evaporator 1.

The cold water supercooled by the supercooler 8 is sent to the ice heat storage tank 12 via the supercooling water pipe 22, and is frozen there to become sherbet-like ice 16. The cold water extracted from the ice heat storage tank 12 is a preheat exchanger having a cold water pump 13 and an electric heater 14a.
14 and the ice core filter 15 to circulate through the heat transfer tube 8a of the subcooler 8.

In this way, a large amount of sherbet-like ice 16 is stored and placed in the ice heat storage tank 12, and when cold heat is required, this ice is stored.
Cold water obtained by melting 16 is extracted by a suction pipe 17 and supplied to a cold heat load 19 via a cold water pump 18.
The cold water that has been raised by cooling here is cooled by the cold water pump 20.
Water is sprayed onto the ice 16 from the water spray nozzle 21.

[0007]

In the above conventional apparatus, since the subcooler 8 and the cold heat load 19 are connected to the ice heat storage tank 12 by separate cold water pipes,
It was not possible to connect these in parallel or in series with each other.

[0008]

The present invention has been invented in order to solve the above-mentioned problems, and its gist is to provide a subcooler for subcooling water and a supercooler for the subcooler. In an ice heat storage device comprising an ice heat storage tank for storing cooled water by freezing it, and a cold heat load for releasing the cold water extracted from the ice heat storage tank, in the ice heat storage tank, the subcooler and An ice heat storage device is characterized in that a switching valve for switching and connecting the cold load and the cold load individually and in series or in reverse order is connected in parallel or in parallel.

[0009]

In the present invention, since it has the above-mentioned configuration, by switching the switching valve according to the outlet cold water temperature of the ice heat storage tank and the cold heat load, the supercooler and the cold heat load are separately provided for the ice heat storage tank. And these are connected in series or in parallel in this order or in reverse order.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT One embodiment of the present invention is shown in FIGS. The cold water outlet 12a of the ice heat storage tank 12 is connected to the cold water inlet / outlet 19a of the cold heat load 19 via a circuit 30, and the circuit 30 is provided with a first pump 34 and a first switching valve 35. The cold water supply port 12b of the ice heat storage tank 12 is connected to the cold water inlet / outlet port 19b of the cold heat load 19 via a circuit 31, and the circuit 31 is provided with a second switching valve 36.

One end 8b of the heat transfer tube 8a of the subcooler 8 is connected via a circuit 32 between a switching valve 35 of a circuit 30 and a cold heat load 19, and a third switching valve 37 is connected to this circuit 32. It is equipped.
Further, the other end 8c of the heat transfer tube 8a is connected via the circuit 33 between the switching valve 36 of the circuit 31 and the cold water supply port 12b, and this circuit 33 has a fourth switching valve 38 and a second pump 39. Is installed.

Further, one end of the circuit 40 is connected between the switching valve 37 of the circuit 32 and the subcooler 8, and the other end of the circuit 40 is connected to the circuit.
It is connected between the connection point of 31 and the circuit 33 and the cold water supply port 12b, and the circuit 40 is provided with a fifth switching valve 41.

Further, one end of the circuit 42 is connected between the switching valve 38 of the circuit 33 and the subcooler 8, and the other end of the circuit 42 is connected to the circuit.
It is connected between the switching valve 35 of 30 and the first pump 34, and a sixth switching valve 43 is interposed in this circuit 42. Other configurations are similar to those of the conventional one shown in FIG.

However, during the cold storage operation, as shown in FIG. 1, only the subcooler 8 is connected to the ice heat storage tank 12 by closing the switching valves 35, 36, 37, 38 and opening the 41, 43. To be done.
Then, when the second pump 39 is stopped and the first pump 34 is operated, the cold water extracted from the cold water outlet 12a of the ice storage tank 12 passes through the circuit 30 as shown by the arrow in FIG. It is energized by the first pump 34, flows through the circuit 42 and the sixth switching valve 43 into the heat transfer pipe 8a of the subcooler 8 through its inlet / outlet port 8c,
Supercooled in the process of flowing through 8a. Then, it is supplied from the inlet / outlet 8b through the circuit 32, the circuit 40, the fifth switching valve 41, the circuit 31, and the cold water supply port 12b into the ice heat storage tank 12, where it is frozen and stored.

Since the cold heat load is small at the start of the cooling operation, the switching valves 35, 36 are opened, 37, 38, 4 as shown in FIG.
By closing 1 and 43, the cold heat load on the ice storage tank 12 is reduced to 19
Only connected. Then, the first pump 34 is operated,
The second pump 39 is stopped. Thus, the cold water heated by being left to cool by the cold load 19 is cooled in the ice heat storage tank 12 and then returns to the cold load 19 again, as shown by the arrow in FIG.

At the beginning of the cooling operation, as shown in FIG.
By closing the switching valves 37, 43 and opening the valves 35, 36, 38, 41, the cold load 19 and the subcooler 8 are connected in series to the ice heat storage tank 12 in this order. And the first and second pumps 3
Drive 4, 39. Then, the cold water heated by being left to cool by the cold load 19 is pre-cooled by the subcooler 8 as shown by the arrow in FIG.
Since the process returns to 12, it is possible to prevent the ice in the ice heat storage tank 12 from being melted in large quantities, and to operate the refrigerator efficiently.

Since the cold heat load is relatively large in the intermediate period of the cooling operation, as shown in FIG. 4, the switching valves 35, 36, 37, 38 are opened and 41, 43 are closed, so that the ice heat storage tank is closed. A cooling load 19 and a subcooler 8 are connected in parallel with respect to 12. Then, the first and second pumps 34, 39 are operated. Then, the cold water flowing out from the cold heat load 19 is, as shown by the arrow in FIG.
Since it circulates and is cooled simultaneously by the ice heat storage tank 12 and the supercooler 8, it is possible to cope with a large cooling load.

Since the temperature of the cold water at the cold water outlet 12a of the ice heat storage tank 12 is higher than the temperature at the inlet of the cold heat load 19 in the latter stage of the cooling operation, as shown in FIG. , 43
By opening and closing 35, 38 and 41, the subcooler 8 and the cooling load 19 are connected in series to the ice heat storage tank 12 in this order. Then, the first pump 34 is operated and the second pump
39 is stopped. Then, the cold water extracted from the ice heat storage tank 12 enters the subcooler 8 as shown by the arrow in FIG. 5, is cooled to a predetermined temperature here, and is then supplied to the cooling load 19, so that the ice heat storage tank The cold heat in 12 can be used until the cold water stored in it becomes hot, and therefore the ice heat storage tank
12 can improve the heat storage efficiency.

[0019]

In the present invention, the ice storage tank is provided with the supercooling device and the cooling heat load individually, and the switching valves for connecting the subcooling device and the cooling load in series in this order or in the reverse order and in parallel to each other. Therefore, at the beginning of the cold storage operation, by connecting the cooling load and the supercooler in series to the ice heat storage tank in this order, it is possible to prevent the ice in the ice heat storage tank from being melted in large quantities. The refrigerator can be operated efficiently. Further, in the intermediate period of the cooling operation, the subcooler and the cooling load can be connected in parallel to the ice heat storage tank, so that a large load can be accommodated. Further, in the latter stage of the cooling operation, since the subcooler and the cooling load can be connected in series in this order to the ice heat storage tank,
Almost all of the cold heat stored in the ice heat storage tank can be used, and therefore, the heat storage efficiency of the ice heat storage tank can be improved.

[Brief description of drawings]

FIG. 1 is a system diagram showing a state during a cold storage operation of an embodiment of the present invention.

FIG. 2 is a system diagram showing a state at the start of the cooling operation of the above embodiment.

FIG. 3 is a system diagram showing the initial state of the cooling operation of the above embodiment.

FIG. 4 is a system diagram showing a state during an intermediate period of the cooling operation of the above embodiment.

FIG. 5 is a system diagram showing a state in the latter half of the cooling operation of the above embodiment.

FIG. 6 is a system diagram of a conventional ice heat storage device.

[Explanation of symbols]

 8 Cooler 12 Ice heat storage tank 19 Cold load 34, 39 Pump 35, 36, 37, 38, 41, 43 Switching valve

Claims (1)

[Claims] 1. A supercooler for subcooling water, an ice heat storage tank for storing the water subcooled by the subcooler by freezing, and a cold heat load for cooling the cold water extracted from the ice heat storage tank. In the ice heat storage device provided with, a switching valve for connecting the subcooler and the cooling heat load to the ice heat storage tank individually and in series or reversely in this order or in parallel and switching them. An ice heat storage device characterized by being provided with.