JPH0561539B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ice cold storage device that stores or extracts cold heat by utilizing the release and absorption of latent heat during freezing and deicing of water.

[Conventional technology]

"Ice Thermal Storage Technology", published on February 19, 1962, is a device that stores the cold energy of the refrigerant of the ice making equipment in the form of ice in an ice cold storage water tank, and when necessary, thaws the ice to extract the cold energy and use it for cooling.・Japan Refrigeration Association, 8 pages. To explain based on FIG. 10, during normal cooling, the refrigerant from the ice-making heat pump 1 is passed through the pipe 9 and the refrigerant/water heat exchanger 2.
Line 11 leads to brine pump 5, and line 1
4 to the ice-making heat pump. On the other hand, on the air conditioner side, the cooling water exiting the air conditioner 20 flows through the pipe 25.
The water enters the refrigerant/water heat exchanger through the refrigerant/water heat exchanger, is cooled by the refrigerant, and is sent through the pipe 29 to the air conditioner 20 by the cold water pump 21 via the pipe 24.

In the ice making process (cold heat is stored in the ice cold storage water tank at night when electricity prices are low), the refrigerant from the ice making heat pump is introduced into the ice making coil 4 of the ice cold storage water tank 3 through a pipe 10 using a three-way valve 6. . The outside of the ice-making coil is filled with water, and this water is cooled by the cold heat of the refrigerant and freezes from the outer periphery of the coil to the outside.
It returns to the ice-making heat pump via the brine pump 5 conduit 14. Since the refrigerant that has obtained cold heat in this way continuously flows into the ice making coil, the cold heat of the refrigerant is stored as ice in the ice storage water tank.

In the ice-melting process to extract cold energy, water for air conditioning is sent from the pipe 27 to the ice storage water tank, and while the ice in the ice storage tank is melted, it becomes cold water and is passed through the pipe 28, the three-way valve 23,
It reaches the air conditioner 20 through a pipe 24, releases cold heat, becomes hot water, and enters the ice storage water tank again through pipes 25 and 27. The cold energy stored in the ice storage water tank in this way is extracted as cold water and used to cool the room.

[Problem that the invention seeks to solve]

However, in the above-mentioned conventional technology, the ice making coil uses a spiral tube or a meandering tube, and
Deicing is done by bringing air conditioning cooling water (or deicing water) into contact with the ice, so if the freezing rate is increased, the contact area between the ice and deicing water becomes smaller, making it easier to introduce deicing water into the ice cold storage tank. This makes it difficult to increase the amount of cold heat stored, and the cold heat extraction efficiency deteriorates.

Furthermore, if the ice is stored in a state where the ice remains melted from the previous day, there is a problem that it takes a long time to store the cold because the heat transfer efficiency is poor due to the ice adhering to the ice making coil. One way to melt ice is to heat a refrigerant and circulate it through the ice-making coil as a heat medium, but the ice is melted indirectly through the pipe wall of the ice-making coil, so the ice-melting efficiency is poor, and the ice If it remains unmelted, it will become the state shown in the middle row of Figure 11, and if it is stored cold in such a state, the water portion 4 that is blocked inside the ice as shown in the bottom row of Figure 11 will occur.
1 is formed and as ice making progresses, the internal pressure of the water part increases,
There is a problem in that the heat transfer tube 4 of the ice making coil is crushed.

[Means for solving problems]

The present invention is an attempt to solve the above-mentioned problems, and one of the inventions is to pass a heat medium through a panel-type ice-making coil of an ice cold storage water tank equipped with a panel-type ice-making coil, while cooling an air conditioner. Water is passed through the ice cold storage tank to thaw the ice blocks that quickly formed between the panels along the ice-making coils, and after a continuous section of thawed ice has formed on both sides of the panel, the supply of heat medium is stopped. This is a method for extracting cold heat from an ice cold storage device, which is characterized in that only cooling water of an air conditioner is passed through an ice cold storage water tank to melt ice and efficiently extract cold heat.

The other method is an ice cold storage device using an ice making heat pump. An ice cold storage device using an ice making heat pump, in which a heat exchanger 2 with an ice making heat pump, an ice cold storage water tank 3 with a panel-type ice making coil installed therein, and a brine pump 5 that supplies refrigerant to the ice making heat pump are connected via piping. A three-way valve 7 provided in front of the brine pump 5 in a conduit 11 leading from the brine pump 5 to the brine pump 5, and a conduit 1 leading from the brine pump 5 to the ice-making heat pump 1.
4, the three-way valve 8 and the pipe line 1
1 is provided with a bypass conduit 15 that connects the two.

Still another method embodies the method of the above invention into an ice cold storage device using a direct expansion type refrigeration device, and its feature is that the compressor 4
5. A direct expansion type refrigeration system in which a condenser 46, a liquid receiver 47, a heat exchanger 2 between the refrigerant and the cooling water of the air conditioner, and an ice storage water tank 3 with a panel ice making coil 4 are connected via piping. A liquid receiver 47 is installed in the ice cold storage device used.
A conduit 51 leading from to the inlet of the panel ice making coil 4
A conduit 55 that branches off from the conduit 51 and returns to the conduit 51;
1, a bypass pipe 52 branches from the pipe 52 and reaches the outlet of the panel ice making coil 4; a bypass pipe 53 branches from the pipe 52 and leads to the pipe 48 from the heat exchanger 2 to the compressor 45; A pipe line 54 branching from the pipe line 53 and reaching the inlet of the heat exchanger 2, a valve 42 provided in the middle of the pipe line 55, a valve 41 provided in the middle of the pipe line 52, and a valve provided in the middle of the pipe line 53. This is because a valve 40 and an expansion valve 44 provided in a conduit 54 are provided.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings. Figure 1 shows an example in which the method of the present invention is applied to an ice cold storage device using an ice making heat pump.
6 is formed by bending in multiple stages, and the space between the heat exchanger tubes in each stage is closed with a heat exchanger plate 17, so that the whole is formed into a panel shape. As a conduit for carrying out the method of the present invention, a conduit 11 runs from the refrigerant/water heat exchanger to the brine pump and from the brine pump to the ice-making heat pump for circulating a heat medium in which a refrigerant is heated by the brine pump 5. A bypass line 15 is provided between the lines 14, a three-way valve 7 is provided at the intersection of the suction side line of the brine pump and the line 11, and a three-way valve 8 is provided at the intersection of the line 14 and the bypass line.

FIG. 2 is an explanatory diagram of normal heating and cooling operation, and the flow of refrigerant is shown by thick lines. Since the operation is the same as that of the conventional device, the description thereof will be omitted.

FIG. 3 is an explanatory diagram of the cold storage operation, and the flow of the refrigerant is shown by thick lines. Since the operation is the same as that of the conventional device, the description thereof will be omitted. FIG. 7 shows the frozen state of the panel ice making coil, and FIG. 7a shows the initial state where ice 40 forms around the heat exchanger tubes. 7th
Figure b shows the state when the freezing is completed, and the freezing covers the entire panel. And blocks of ice are constantly formed between the panels. The heat transfer plate of the panel ice making coil acts as a fin to promote heat transfer, allowing highly efficient cold storage. FIG. 4 is an explanatory diagram of a cold heat extraction operation performed using the pipeline of the present invention, in which the ice-making heat pump is first switched to heating operation,
The refrigerant is heated to become a heat medium, and then the ice-making heat pump is stopped. Next, the three-way valves 7, 6, and 8 are operated so that the flow is as shown by the arrow, and when the pline pump is operated, the heat medium circulates through the pipe line as shown by the arrow. In the ice storage tank, the entire panel of the ice-making coil acts as a heat transfer body to melt the ice that has formed on the panel. In the early stages of ice melting, the ice is melted from the panel side by the circulation of the heating medium, and at the same time cooling water for the air conditioner is supplied to the pipes 27 and 28.
It circulates through the panel and melts it from the outside of the panel. Thereafter, as shown in Figure 8a, the ice on both sides of the panel melts to form continuous melted ice sections on both sides of the panel. Cooling water for the air conditioner then flows down through this melted ice section. In such a state, the contact area between the ice and the cooling water of the air conditioner increases, and the flow rate of the cooling water of the air conditioner increases, resulting in a dramatic improvement in ice melting efficiency. Once the ice melting efficiency has been improved, the operation of the heat transfer medium is stopped and ice melting is continued only by circulating the cooling water of the air conditioner. As described above, since ice is efficiently thawed, a higher cold heat extraction capacity can be maintained than in conventional devices.

Furthermore, since the ice-making coil is of a panel type, there is no blockage of water around the heat exchanger tubes, so the heat exchanger tubes are not crushed by water pressure.

FIG. 9 shows an embodiment in which the method of the present invention is applied to an ice heat storage device using a direct expansion type refrigeration device, and the ice making coil of the ice cold storage water tank is the same as that of the previous embodiment. The ice cold storage device using the above-mentioned direct expansion refrigeration device includes a compressor 45,
A direct expansion refrigeration system is used in which a condenser 46, a liquid receiver 47, a heat exchanger 2 between the refrigerant and the cooling water of the air conditioner, and an ice storage water tank 3 equipped with a panel ice making coil 4 are connected via piping. In the ice cold storage device, an expansion valve 43 is provided in the middle of a pipe line 51 extending from the liquid receiver 47 to the inlet of the panel ice making coil 4.

A conduit 55 that branches off from the conduit 51 and returns to the conduit 51 for carrying out the method of the present invention, a conduit 52 that branches off from the conduit 51 and reaches the outlet of the panel ice making coil 4; Branch to refrigerant/water heat exchanger 2
A conduit 53 connects to the conduit 48 from the outlet of the refrigerant to the compressor 45, and a refrigerant/
The pipe line 54 leading to the inlet of the water heat exchanger 2 and the refrigerant/cooling water inlet pipe line 25 of the air conditioner of the water heat exchanger 2 and the refrigerant/
An outlet pipe 26 for the cooling water of the air conditioner of the water heat exchanger 2, a pipe 27 branching from the pipe 26 and leading to the inlet of the cooling water of the air conditioner of the ice cold storage water tank 3, and cooling of the air conditioner of the ice cold storage water tank. A water outlet pipe 28 is provided, and pipes 53, 52,
Valves 40, 41, 42 are provided in the middle of the pipe line 5.
4 is provided with an expansion valve 44.

During normal cooling operation, valves 40 and 42 are closed, and valve 41 is closed.
The air conditioner is opened and the compressor 45 is operated to pass the refrigerant through the pipes 52→54→48, and the refrigerant/water heat exchanger is used as an evaporator to cool the cooling water of the air conditioner.

In the cold storage operation, the valves 41 and 42 are closed, the valve 40 is opened, and the refrigerant is passed through the sensing channels 51 → 53 → 48, and the panel-type ice making coil of the ice cold storage water tank is used as the evaporator, and the water in the ice cold storage tank is frozen to form ice. It stores cold energy as a.

In the cold heat extraction operation, the valves 40 and 41 are closed, the valve 42 is opened, the expansion valve 43 is closed, and 44 is opened, and the high-pressure and high-temperature heat medium (refrigerant) is passed through the panel-type ice making coil of the ice cold storage tank. melt the ice. The heat medium that has obtained the cold heat is evaporated in the refrigerant/water heat exchanger whose pressure is reduced by the expansion valve 44 to cool the cooling water of the air conditioner. The vaporized gas reaches the compressor.
On the other hand, the cooling water of the air conditioner is cooled by the refrigerant/water heat exchanger, passes through the pipe 27, enters the ice cold storage water tank, melts the ice, obtains cold heat, and passes through the pipe 28 to the air conditioner for cooling. used. In this embodiment as well, the ice in the ice storage water tank is melted from both the heat medium passing through the heat transfer tubes and the cooling water of the air conditioner, so the ice melting efficiency is dramatically improved compared to the conventional device.

〔Effect of the invention〕

Since the present invention is constructed as described above, cold heat can be extracted efficiently from the ice storage water tank, and accidents such as the heat transfer tubes of the ice making coil being crushed by the pressure water in the ice do not occur.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an embodiment in which the method of the present invention is applied to an ice cold storage device using an ice-making heat pump;
Figure 2 is an explanatory diagram of normal cooling operation in Figure 1;
Figure 3 is an explanatory diagram of the cold storage operation in Figure 1;
The figure is an explanatory diagram of the ice-melting operation in Figure 1, Figures 5 and 6 are front and side views of the panel type ice making coil, and Figures 7a and 7b are explanatory diagrams of the frozen state of the panel type ice making coil. , FIGS. 8a and 8b are explanatory diagrams of the thawing state of the panel type coil, FIG. 9 is a circuit diagram of an embodiment in which the method of the present invention is applied to an ice cold storage device using a direct expansion type refrigeration device, and FIG. FIG. 10 is a circuit diagram of a conventional ice cold storage device, and FIG. 11 is an explanatory diagram illustrating a situation in which a conventional heat transfer coil is crushed by the pressure of blocked water. 1...Heat pump for ice making, 2...Refrigerant/water heat exchanger, 3...Ice cold storage tank, 4...Ice making coil (or panel ice making coil), 5...Brine pump, 20...Air conditioner, 21 ...Cold water pump, 7,
8...Three-way valve, 15...Bypass pipeline, 16...
Heat exchanger tube, 17... Heat exchanger plate, 40, 41, 42...
Valve, 43, 44... Expansion valve, 45... Compressor, 46... Condenser, 47... Receiver, 53...
Bypass pipeline.

Claims (1)

[Scope of Claims] 1. While passing a heat medium through the panel-type ice-making coil of the ice-storage water tank in which the panel-type ice-making coil is installed, cooling water from the air conditioner is passed through the ice-storage water tank and the cooling water is passed between the panels.
After the ice blocks that have formed quickly are melted along the ice-making coil and a continuous section of melted ice is formed on both sides of the panel, the supply of heat medium is stopped and only the cooling water for the air conditioner is transferred to the ice cold storage tank. A method for extracting cold heat from an ice cold storage device, which is characterized by melting ice through ice and extracting cold heat. 2. Ice-making heat pump 1, heat exchanger 2 between the refrigerant from the ice-making heat pump 1 and the cooling water of the air conditioner,
An ice cold storage device using an ice making heat pump is connected via piping to an ice cold storage water tank 3 equipped with a panel-type ice making coil, and a brine pump 5 that supplies refrigerant to the ice making heat pump, from the heat exchanger 2 to the brine pump 5. A three-way valve 7 provided in front of the brine pump 5 in the conduit 11, a three-way valve 8 provided in the middle of the conduit 14 from the brine pump 5 to the ice-making heat pump 1, and a three-way valve 8 provided between the three-way valve 8 and the conduit 11. A cold heat extraction device in an ice cold storage device, which is provided with a connecting bypass pipe line 15. 3 Compressor 45, condenser 46, liquid receiver 4
7. A heat exchanger 2 between the refrigerant and the cooling water of the air conditioner, and an ice cold storage tank 3 equipped with a panel ice making coil 4 are connected via piping to an ice cold storage device using a direct expansion type refrigeration device. From container 47 to panel ice making coil 4
A pipe line 55 branches from the pipe line 51 leading to the inlet of the pipe line 51 and returns to the pipe line 51; a pipe line 52 branches from the pipe line 51 and reaches the outlet of the panel ice making coil 4;
branched from the heat exchanger 2 to the compressor 45
A bypass pipe line 53 leading to a pipe line 48 leading to the pipe line 53, a pipe line 54 branching from the pipe line 53 and reaching the inlet of the heat exchanger 2, a valve 42 provided in the middle of the pipe line 55, A cold heat extraction device in an ice cold storage device comprising a valve 41 provided in the middle, a valve 40 provided in the middle of a conduit 53, and an expansion valve 44 provided in a conduit 54.