JP3308141B2 - Ice storage air conditioning equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ice regenerative air conditioner, and more particularly to an ice regenerative air conditioner having an ice regenerator and suitably used for general buildings such as office buildings.

[0002]

2. Description of the Related Art An ice regenerative air conditioning system has been developed as a cooling system that uses economical nighttime electric power, and is used as an energy-saving and space-saving building cooling system.
Conventionally, in ice storage air conditioning equipment using an ice storage tank,
At night, open the control valve on the route that bypasses the water heat exchanger,
The control valve on the path leading to the water heat exchanger is closed, brine is cooled by the refrigerator, and the water in the ice storage tank is frozen by the brine to store heat. The brine was cooled using the heat of fusion, the control valve in the path leading to the water heat exchanger was closed, the brine was led to the water heat exchanger, and the cooling water was cooled to take out the cooling capacity. In this case, in order to make ice in the ice thermal storage tank at night, it is necessary to lower the temperature of the brine below the freezing temperature of water (0 ° C.).

[0003]

Therefore, when air conditioning is to be performed during nighttime heat storage operation, the control valve on the path leading to the water heat exchanger is opened, the brine is led to the water heat exchanger, and the cold water is cooled. Although it is necessary to perform the air-conditioning operation, since the brine is below the freezing temperature (0 ° C.), there is a problem that the cold water freezes in the water heat exchanger. If a leak occurs in the control valve in the path leading to the water heat exchanger, brine having a freezing temperature (0 ° C.) or less flows into the water heat exchanger during nighttime heat storage operation, and the water in the water heat exchanger. There was a risk that the cold water would freeze.

[0004] The present invention has been made in view of the above circumstances, and can perform air conditioning even during a heat storage operation.
It is another object of the present invention to provide an ice regenerative air conditioner in which chilled water does not freeze in the water heat exchanger even when a leak occurs in a control valve in a path leading to the water heat exchanger during nighttime heat storage operation. Aim.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a brine path in which a refrigerator, an ice heat storage tank, a water heat exchanger, a brine circulation pump and a control valve are connected by piping, It has a brine path with a control valve that bypasses the exchanger, a chilled water path that connects a water heat exchanger, multiple air conditioners and a chilled water pump with piping, and is linked to the operation and shutdown of the air conditioner. An air conditioner control device for controlling the opening and closing of a cold / hot water valve provided for each air conditioner, cooling the brine with the refrigerator, and freezing the water in the ice heat storage tank with the brine. The heat is stored, and at the time of heat release, the brine is cooled by the heat of melting of ice in the ice storage tank, the brine is guided to a water heat exchanger, and the cooling water is cooled to obtain a cooling capacity. At the cold water outlet side of the water heat exchanger And cold water temperature sensor in the road, provided a brine temperature sensor into brine inlet-side path of the water heat exchanger, the temperature detected by cold water temperature sensor and the brine temperature sensor in thermal storage operation, provided for each air conditioner An air conditioner monitoring device is provided for performing control to forcibly open the provided cold / hot water valve.

According to the present invention, based on the temperature detected by the chilled water temperature sensor provided in the chilled water outlet path of the water heat exchanger and the brine temperature sensor provided in the brine inlet path of the water heat exchanger. Thus, control for forcibly opening the cold / hot water valve provided for each air conditioner can be performed. Thereby, it is possible to forcibly circulate cold water to a predetermined air conditioner other than the air conditioner performing the air conditioning,
Since the amount of circulating water in the chilled water path can be increased, air conditioning can be performed even during the heat storage operation without freezing the chilled water in the water heat exchanger. In addition, even if the control valve in the brine path leading to the water heat exchanger leaks during the pure heat storage operation at night and brine flows into the water heat exchanger, circulate cold water through the cold water path. Therefore, freezing of cold water in the water heat exchanger can be prevented.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an ice storage type air conditioner according to the present invention will be described below with reference to the drawings. FIG. 1 shows a flow diagram of the ice storage type air conditioner of the present invention. As shown in FIG. 1, the ice storage type air conditioner includes a refrigerator 1, an ice storage tank 2, a water heat exchanger 3, a brine circulation pump 4, and a control valve 5.
, A brine path including a control valve 8 that bypasses the water heat exchanger 3, a water heat exchanger 3, a plurality of air conditioners (air conditioners) 9, and a chilled water pump 10.
And a cold water path connected by a pipe 11.

Each air conditioner 9 includes a cold / hot water valve 13 and controls opening / closing of the cold / hot water valve 13 provided for each air conditioner 9 in conjunction with the operation / stop of the air conditioner 9. A control device 14 is provided. Each air conditioner 9 can be operated / stopped by the remote controller R.

The ice regenerative air conditioner includes a chilled water temperature sensor S1 in the chilled water outlet path of the water heat exchanger 3, and a brine temperature sensor S1 in the brine inlet path of the water heat exchanger 3.
2 is provided. Then, based on the temperatures detected by the cold water temperature sensor S1 and the brine temperature sensor S2, the air conditioner 9
An air conditioner monitoring device 15 for controlling the forced opening of the cold / hot water valve 13 provided for each is further provided.

The chilled water temperature sensor S1 and the brine temperature sensor S2 are connected to an air conditioner monitor 15, and the air conditioner controllers 14 of the air conditioners 9 are controlled by the air conditioner monitor 1 respectively.
5 is connected.

In the above-described configuration, during the nighttime heat storage operation, the refrigerator 1 is operated to cool the brine, and the brine is cooled by the control valve 8 to bypass the water heat exchanger 3 in the ice heat storage tank 2. And heat is stored by making ice in the ice heat storage tank 2. In addition, when performing the cooling operation in the daytime, the brine is cooled using the heat of melting of the ice in the ice heat storage tank 2,
The brine is guided to the water heat exchanger 3 to cool the chilled water, and the chilled water is guided to the air conditioners 9, and each air conditioner 9 cools the living room.

In this embodiment, a cold water temperature sensor S1, a brine temperature sensor S2, and an air conditioner monitoring device 15 are provided. A specific example in the case of operating an air conditioner with this configuration will be described below. (1) When the temperature detected by the chilled water temperature sensor S <b> 1 becomes equal to or lower than a predetermined set temperature (for example, 2 ° C.), the air conditioning equipment monitoring device 15 controls the chilled / hot water valve 13 provided for each air conditioner 9.
Is forcibly opened. In this case, the cold / hot water valve 13 provided for each air conditioner 9 to be forcibly opened can be appropriately selected. (2) When the temperature detected by the brine temperature sensor S2 becomes equal to or lower than a predetermined set temperature (for example, 2 ° C.), the air conditioner monitoring device 15 forcibly activates the cold / hot water valve 13 provided for each air conditioner 9. Open.
In this case, the cold / hot water valve 13 provided for each air conditioner 9 to be forcibly opened can be appropriately selected. When selecting the chilled / hot water valve 13 provided for each air conditioner 9 to be forcibly opened, if the distant one on the pipe route or the chilled / hot water valve with a large diameter is selected, the circulating water amount increases. As a result, the effect of preventing freezing is increased, and optimal conditions can be selected according to the conditions at the site.

As described above, according to this embodiment, the chilled water temperature sensor S1 provided in the chilled water outlet side path of the water heat exchanger 3
And a control for forcibly opening the cold / hot water valve 13 provided for each air conditioner 9 based on the temperature detected by the brine temperature sensor S2 provided in the brine inlet side path of the water heat exchanger 3. Can do it. As a result, it is possible to forcibly circulate the chilled water also to the predetermined air conditioner 9 other than the air conditioner 9 which is performing the air conditioning, and it is possible to increase the amount of circulating water in the chilled water path. Also, air conditioning can be performed without freezing the cold water in the water heat exchanger 3. Further, even if the control valve 5 in the brine path leading to the water heat exchanger 3 leaks during the pure heat storage operation at night and the brine flows into the water heat exchanger 3, if the chilled water pump is operated, Since cold water can be circulated in the cold water path, freezing of the cold water in the water heat exchanger 3 can be prevented.

Further, according to the present embodiment, when the heat is stored from the ice heat storage tank 2, the cold water can be circulated through the cold water path on the secondary side of the water heat exchanger 3. Can store heat.

[0015]

As described above, according to the present invention, a chilled water temperature sensor provided in a chilled water outlet path of a water heat exchanger and a brine temperature sensor provided in a brine inlet path of the water heat exchanger. Based on the temperature detected in (1) and (2), control for forcibly opening a cold / hot water valve provided for each air conditioner can be performed. With this, it is possible to forcibly circulate the chilled water also to a predetermined air conditioner other than the air conditioner that is performing air conditioning, and it is possible to increase the amount of circulating water in the chilled water path. Also, air conditioning can be performed without freezing the cold water in the water heat exchanger. In addition, even if the control valve in the brine path leading to the water heat exchanger leaks during the pure heat storage operation at night and brine flows into the water heat exchanger, circulate cold water through the cold water path. Therefore, freezing of cold water in the water heat exchanger can be prevented.

Further, according to the present invention, when the heat is stored from the ice heat storage tank, the cold water can be circulated in the cold water path on the secondary side of the water heat exchanger, so that the heat is stored in the cold water path. There is a secondary effect of being able to do so.

[Brief description of the drawings]

FIG. 1 is a flowchart showing an embodiment of an ice storage type air conditioner according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refrigerator 2 Ice heat storage tank 3 Water heat exchanger 4 Brine circulation pump 5, 8 Control valve 9 Air conditioner 10 Chilled water pump 13 Chilled and heated water valve 14 Air conditioner control device 15 Air conditioning equipment monitoring device S1 Chilled water temperature sensor S2 Brine temperature sensor

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takeshi Tamaru 11-1 Haneda Asahimachi, Ota-ku, Tokyo Ebara Corporation (56) References JP-A-2-89946 (JP, A) JP-A-Hei JP-A-2-219959 (JP, A) JP-A-6-235545 (JP, A) JP-A-53-49356 (JP, A) JP-A-7-190422 (JP, A) JP-A-1-66531 (JP, A) U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F24F 5/00 102

Claims (4)

(57) [Claims] 1. A brine path in which a refrigerator, an ice storage tank, a water heat exchanger, a brine circulation pump, and a control valve are connected by piping, a brine path including a control valve that bypasses the water heat exchanger, and a water heat source. It has a chilled water path to which an exchanger, a plurality of air conditioners and a chilled water pump are connected by piping, and opens and closes a chilled and heated water valve provided for each air conditioner in conjunction with the operation and stoppage of the air conditioner. An air conditioner control device for controlling, the refrigerator cools the brine, freezes the water in the ice storage tank by the brine and stores the heat, and dissipates heat of the ice in the ice storage tank during heat radiation. Cool the brine at
An ice regenerative air conditioner that guides the brine to a water heat exchanger and cools chilled water to take out cooling capacity, comprising a chilled water temperature sensor and a water heat exchanger in a chilled water outlet side path of the water heat exchanger. A control in which a brine temperature sensor is provided in the brine inlet side path and the chilled / hot water valve provided for each air conditioner is forcibly opened according to the temperature detected by the chilled water temperature sensor and the brine temperature sensor during the heat storage operation. An ice storage type air conditioner, which is provided with an air conditioner monitoring device for performing the above. 2. The air conditioning equipment monitoring device forcibly opens a cold / hot water valve provided for each air conditioner when a temperature detected by the cold water temperature sensor falls below a predetermined set temperature. 2. The ice regenerative air conditioner according to claim 1, wherein the control is performed. 3. The air-conditioning equipment monitoring device forcibly opens a cold / hot water valve provided for each air conditioner when the temperature detected by the brine temperature sensor falls below a predetermined set temperature. 2. The control according to claim 1, wherein
The ice storage type air conditioner described in the item. 4. The air conditioning equipment monitoring device according to claim 1, wherein the temperature detected by the chilled water temperature sensor is equal to or lower than a predetermined set temperature, or the temperature detected by the brine temperature sensor is equal to or lower than a predetermined set temperature. 4. The ice regenerative air conditioner according to claim 2, wherein a cold / hot water valve provided for each air conditioner to be forcibly opened when the temperature rises can be selected.