JP4464114B2 - Thermal storage device and thermal storage control method - Google Patents

Description

  The present invention relates to a heat storage device for cooling suitable for an air conditioning (cooling) system for buildings such as buildings and factories, and a heat storage control method for the heat storage device.

  In recent years, as one of the cooling systems for buildings such as buildings and factories, cold energy is generated using electric power at night, the generated cold energy is stored in a heat storage tank, and the stored cold energy is used in the daytime. There is a heat storage device that performs cooling. Since the conventional heat storage device has adopted a water heat storage system for storing cold water in a heat storage tank, the volume of the heat storage tank can be reduced to about 1/6 to 1/8 by storing this cold water as ice, In recent years, an ice heat storage system has been adopted. Below, the structure of the conventional heat storage apparatus of an ice heat storage system is demonstrated, referring FIGS. 8-10. 8 is a diagram showing a schematic configuration of a conventional ice heat storage device, FIG. 9 is a diagram showing a detailed internal configuration of the cold water tank (10) shown in FIG. 8, and FIG. It is a figure which shows the detailed internal structure of the ice thermal storage tank (20) shown in FIG.

  As shown in FIG. 8, the ice heat storage type heat storage device includes a cold water tank (10) and an ice heat storage tank (20). The cold water tank (10) further includes a high temperature tank ( 11), an intermediate tank (12), and a low temperature tank (13).

  The high temperature tank (11) is a cold water tank holding 15 ° C. water, the low temperature tank (13) is a cold water tank holding 5 ° C. water, and the intermediate tank (12) is a high temperature tank (11). It is a cold water tank which holds the water of intermediate temperature with a low temperature tank (13). In addition, as shown in FIG. 9, the intermediate tank (12) is divided into a plurality of tanks. In addition, when the heat capacity of the water cooler (40) is larger than the heat capacity of the heat load (50) of the air conditioner or the like shown in FIG. 8 (heat capacity of heat load <heat capacity of the water cooler), Water has a higher proportion of cold water (heat storage). Moreover, when the heat capacity of the water cooler (40) is smaller than the heat capacity of the heat load (50) of an air conditioner or the like (heat capacity of heat load> heat capacity of the water cooler), the water in the cold water tank (10) is hot. The proportion of water increases (heat dissipation).

  The ice heat storage tank (20) is a tank for making ice and storing cold heat, and is divided into a plurality of tanks as shown in FIG.

  Next, with reference to FIGS. 11 and 12, the control operation of the heat storage device configured as described above will be described by dividing it into a heat storage operation and a heat radiation operation.

(Control action during heat storage operation)
First, the control operation of the heat storage device during the heat storage operation will be described with reference to FIG. The heat storage operation is a control operation performed at midnight when the cooling load (cooling in the building) is stopped, and is performed using nighttime electric power with a low electricity bill.

  First, at the time of heat storage operation, the circulation pump (1) and the circulation pump (2) are stopped, and water supply by the circulation pipe (100) and the circulation pipe (200) is stopped. Then, the brine refrigerator (30) and the brine circulation pump (31) are operated. As a result, the low-temperature brine cooled to a negative temperature by the brine circulation pump (31) circulates as shown in FIG. 11, and around the heat exchanger (32) incorporated in the ice heat storage tank (20). Ice is made into ice, and this ice is stored in the ice heat storage tank (20). Further, the water cooler (40) and the circulation pump (3) are operated, and the 15 ° C. water held in the high-temperature tank (11) is sent to the water cooler (40) through the circulation pipe (300). Cool to 5 ° C. water with chiller (40). And the water cooled to 5 degreeC is sent to a low temperature tank (13), and 5 degreeC water is stored in a low temperature tank (13).

(Control action during heat radiation operation)
Next, the control operation of the heat storage device during the heat radiation operation will be described with reference to FIG. During the heat dissipation operation, it is performed during the daytime when the heat load (50) such as an air conditioner is used, and the low-temperature tank that radiates the cold stored in the ice heat storage tank (20) at night and supplies it to the heat load ( The water held in 13) is cooled.

  First, during the heat radiation operation, as shown in FIG. 12, the circulation pump (1) and the circulation pump (2) are operated, and the 5 ° C. water held in the low temperature tank (13) is air-conditioned through the circulation pipe (100). Water is supplied to a thermal load (50) such as a machine. And in heat load (50), such as an air conditioner, 5 degreeC water sent through the circulation pipe (100) is thermally converted into 15 degreeC water, and water is sent to a high temperature tank (11). Further, 15 ° C. water held in the high-temperature tank (11) is supplied to the ice heat storage tank (20) through the circulation pipe (200), and the ice is made around the heat exchanger (32) incorporated in the ice heat storage tank (20). The formed ice is gradually melted and supplied to the low-temperature tank (13) as 5 ° C. cooling water. During the heat radiation operation, the water control valve (200) provided in the circulation pipe (200) is based on the detected water temperature of the temperature measuring device (70) provided between the ice heat storage tank (20) and the low temperature tank (13). 60) by adjusting the valve opening and bypassing a part of the water sent to the ice heat storage tank (20) through the circulation pipe (200) and diverting it to the cold water bypass pipe (61), The cold water to be supplied is set to 5 ° C. Moreover, since the ice in the ice heat storage tank (20) is melted using 15 ° C. water held in the high temperature tank (11), the water after the ice in the ice heat storage tank (20) is completely melted. The temperature will be 15 ° C.

  Thus, the conventional heat storage device operates the brine refrigerator (30) using cheap electric power at night, manufactures ice from the 15 ° C. water held in the ice heat storage tank (20), and is used in the daytime. Thus, the produced ice was used for cooling or the like while being melted using 15 ° C. water held in the high-temperature tank (11).

In addition, as a technical document filed earlier than the present invention, there is an ice heat storage system that uses heavy water having a freezing point higher than ice and reduces the energy consumed until reaching the ice heat storage temperature, thereby improving the efficiency of the ice heat storage system. is there. This ice heat storage system is an ice heat storage system in which ice is produced in an ice heat storage tank by a refrigerator and heat is generated by a heat exchange device while melting the ice, and heavy water is contained in the ice heat storage tank. Heavy water ice is made and the heat is extracted from the heavy water ice (for example, see Patent Document 1).
JP-A-4-55643

  However, the brine refrigerator (30) of the ice heat storage tank (20) included in the conventional heat storage apparatus shown in FIG. 8 is less efficient and consumes less power than the water cooler (40) of the cold water tank (10). There is concern about the increase in size, and it is necessary to reduce power consumption when manufacturing ice in the ice heat storage tank. Also, as in Patent Document 1, heavy water is stored in an ice heat storage tank to make heavy water ice, and energy consumption until reaching the ice heat storage temperature is reduced by taking out heat from the heavy water ice, Although it is possible to reduce power consumption, it is considered preferable from the viewpoint of facility cost to reduce power consumption by using the existing heat storage device shown in FIG. 8 as it is.

  This invention is made | formed in view of the said situation, and it aims at providing the thermal storage apparatus and the thermal storage control method which enable further reduction of power consumption, utilizing the existing thermal storage apparatus. .

  In order to achieve this object, the present invention has the following features.

The heat storage device according to the present invention includes a refrigerant liquid tank and a heat storage tank that hold a refrigerant liquid, and the refrigerant liquid tank is at least divided into a high-temperature tank and a low-temperature tank, and the high-temperature refrigerant that the high-temperature tank holds. The temperature of the liquid is a heat storage device higher than the temperature of the low-temperature refrigerant liquid held by the low-temperature tank, and during the heat storage operation, the low-temperature refrigerant liquid held by the low-temperature tank is supplied to the heat storage tank, and the supplied low temperature The refrigerant liquid is cooled in the heat storage tank to generate a solidified body, and during the heat radiation operation, the high-temperature refrigerant liquid held by the high-temperature tank is supplied to the heat storage tank, and the solidified body generated in the heat storage tank is melted. The low-temperature refrigerant liquid is generated, the generated low-temperature refrigerant liquid is supplied to the low-temperature tank, the low-temperature refrigerant liquid supplied to the low-temperature tank is supplied to a cold load on the cold demand side, and heat exchange is performed. The high-temperature refrigerant liquid generated by the exchange is supplied to the high-temperature tank. And control means for, in the thermal storage tank includes a detecting means for detecting a temperature of the refrigerant liquid held by the heat storage tank, the control means, the heat storage tank low temperature refrigerant liquid held in the cryostat The low-temperature refrigerant liquid supplied to the heat storage tank when the temperature of the refrigerant liquid in the heat storage tank detected by the detection means becomes the temperature of the low-temperature refrigerant liquid after starting the process of supplying to the heat storage tank Is cooled in the heat storage tank to produce a solidified body .

The heat storage control method according to the present invention includes a refrigerant liquid tank and a heat storage tank that hold a refrigerant liquid, and the refrigerant liquid tank is at least divided into a high-temperature tank and a low-temperature tank, and the high-temperature tank has a high temperature. The temperature of the refrigerant liquid is a heat storage control method that is performed by a heat storage device that is higher than the temperature of the low-temperature refrigerant liquid held by the low-temperature tank, and supplies the low-temperature refrigerant liquid held by the low-temperature tank to the heat storage tank during heat storage operation. A cooling process in which the supplied low-temperature refrigerant liquid is cooled in the heat storage tank to generate a solidified body to accumulate cold heat, and during the heat radiation operation, the high-temperature refrigerant liquid held by the high-temperature tank is supplied to the heat storage tank, The solidified body generated in the heat storage tank is melted to generate a low-temperature refrigerant liquid, the generated low-temperature refrigerant liquid is supplied to the low-temperature tank, and the low-temperature refrigerant liquid supplied to the low-temperature tank is Heat supply to the cold load Have a, a radiator supplying to said hot bath hot refrigerant liquid generated by conversion, the thermal storage process, the low-temperature refrigerant liquid held in the cryostat after starting the processing to be supplied to the heat storage tank, When the temperature of the refrigerant liquid in the heat storage tank reaches the temperature of the low-temperature refrigerant liquid, the low-temperature refrigerant liquid supplied to the heat storage tank is cooled in the heat storage tank to generate a solidified body. It is characterized by.

  According to the heat storage device and the heat storage method of the present invention, when the refrigerant liquid is solidified, it is solidified from the refrigerant liquid at a temperature lower than that of the conventional heat storage apparatus and method, and cold energy can be accumulated with less energy. .

  Hereinafter, the refrigerant liquid will be described as water, but is not necessarily limited thereto. An appropriate substance can be selected as the refrigerant liquid depending on the operating temperature of the heat storage device and the heat load. In order to describe the refrigerant liquid as water, in the following, the refrigerant liquid tank is a cold water tank, the heat storage tank is an ice heat storage tank, the cooler is a water cooler, the high temperature refrigerant liquid is high temperature cold water, and the low temperature refrigerant liquid. Is expressed as low-temperature cold water and the solidified body as ice.

  The heat storage device according to the present invention includes a circulation pump (4) and a circulation pipe (400) for supplying water from an ice heat storage tank (20) to a high temperature tank (11). ), And before operating the brine refrigerator (30) and the brine circulation pump (31) to generate ice in the ice storage tank (20), operate the circulation pump (4). Water of 15 ° C held in the ice heat storage tank (20) is sent to the high temperature tank (11) through the circulation pipe (400), and water of 5 ° C held in the low temperature tank (13) is transferred to the ice heat storage tank (20). It is made to flow in. As a result, the water stored in the ice heat storage tank (20) is converted to 5 ° C water. When the water is converted to 5 ° C water, the circulation pump (4) is stopped, and the brine refrigerator ( 30) and the brine circulation pump (31) are operated to generate ice in the ice heat storage tank (20), so that conventionally, an inefficient brine refrigerator (30) is operated to generate ice from 15 ° C. water. Since the generated treatment is to generate ice from 5 ° C. water, it is possible to reduce power consumption until the 15 ° C. water is cooled to 5 ° C. water.

Hereinafter, a heat storage device according to the present invention will be described with reference to the accompanying drawings.
First, the configuration of the heat storage device according to the present invention will be described with reference to FIG.

  The heat storage device according to the present invention includes a cold water tank (10) and an ice heat storage tank (20).

  The cold water tank (10) is also referred to as a heat storage water tank, and is a water tank adapted to cope with a rapid change in heat load, and has a high temperature tank (11) holding 15 ° C. water and 5 ° C. water. To the low temperature tank (13) and the intermediate tank (12) holding water at a temperature intermediate between 15 ° C. water held by the high temperature tank (11) and 5 ° C. water held by the low temperature tank (13). It is structured separately.

  The ice heat storage tank (20) is a water tank for storing the ice stored in the ice heat storage tank (20) as ice and supplying the cold water using the ice stored in the ice to the low temperature tank (13). is there. Since the melting heat amount of ice is 80 Kcal / kg, the heat amount 80 times that of water can be stored in the ice heat storage tank (20). In addition, in order to make the water which an ice thermal storage tank (20) holds into ice, it will carry out using a brine refrigerator (30), and the brine cooled to minus temperature with the brine refrigerator (30) is a brine circulation pump. As shown in FIG. 3, it is circulated by (31), and ice is generated around the heat exchanger (tube) (32) incorporated in the ice heat storage tank (20). 20) The ice will be stored inside. Brine is an antifreeze liquid that does not freeze even when the temperature reaches 0 ° C.

  Moreover, in order to use heat load (50), such as an air conditioner, using the 5 degreeC water which a low-temperature tank (13) holds, the heat storage apparatus concerning this invention has a circulation pump (1) and a circulation pipe (100). ) Is provided between the low temperature tank (13) and the high temperature tank (11) via a heat load (50) such as an air conditioner.

  In addition, the circulation pump (2) and the circulation pipe (200) for feeding water at 15 ° C. held in the high temperature tank (11) to the ice heat storage tank (20) include the high temperature tank (11) and the ice heat storage tank (20). Between. Further, the circulation pipe (200) is provided with a water control valve (60) for bypassing a part of the water supplied to the ice heat storage tank (20) and diverting it to the cold water bypass pipe (61).

  Moreover, the water cooler (40), the circulation pump (3), and the circulation pipe (300) for converting 15 degreeC water which the high temperature tank (11) holds into 5 degreeC water, and sending water to a low temperature tank (13) Are provided between the high temperature tank (11) and the low temperature tank (13).

  The heat storage device according to the present invention includes an ice heat storage tank (20) and a high temperature tank for circulating pump (4) and circulation pipe (400) for feeding water from ice heat storage tank (20) to high temperature tank (11). (11) and the circulation pump (4) is operated before the brine refrigerator (30) and the brine circulation pump (31) are operated to generate ice in the ice heat storage tank (20). Then, 15 ° C. water held in the ice storage tank (20) is fed to the high temperature tank (11) through the circulation pipe (400), and 5 ° C. water held in the low temperature tank (13) is transferred to the ice storage tank (20 ). As a result, the water in the ice heat storage tank (20) is converted to 5 ° C. water, and when it is converted to 5 ° C. water, the circulation pump (4) is stopped and the brine refrigerator (30). And the brine circulation pump (31) are operated to generate ice in the ice heat storage tank (20), thereby conventionally operating the inefficient brine refrigerator (30) to generate ice from 15 ° C. water. Since the ice treatment is generated from the 5 ° C. water, the power consumption until the 15 ° C. water is cooled to 5 ° C. water can be reduced. Hereinafter, the control operation of the heat storage device according to the present invention will be described with reference to FIGS. 2 to 4 separately for the heat storage operation and the heat radiation operation.

(Control action during heat storage operation)
First, the control operation of the heat storage device during the heat storage operation will be described with reference to FIGS. 2 and 3. The heat storage operation is a control operation performed at midnight when the cooling load (cooling in the building) is stopped, and is performed using nighttime electric power with a low electricity bill.

  First, during the heat storage operation, the circulation pump (1) and the circulation pump (2) are stopped. Then, as shown in FIG. 2, the circulation pump (3) and the circulation pump (4) are operated, and the water cooler (40) is supplied through the circulation pipe (300) to the 15 ° C. water held in the high-temperature tank (11). The water at 15 ° C. is cooled to 5 ° C. water in the water cooler (40). And the water cooled to 5 degreeC is sent to a low temperature tank (13), and 5 degreeC water is stored in a low temperature tank (13). Moreover, 15 degreeC water which an ice thermal storage tank (20) holds is sent to a high temperature tank (11) through a circulation pipe (400), and 5 degreeC water which a low temperature tank (13) holds is stored in an ice thermal storage tank (20). The water stored in the ice heat storage tank (20) is converted into 5 ° C. water.

  Next, when it is determined that the water stored in the ice heat storage tank (20) has been converted to 5 ° C., the brine refrigerator (30) and the brine circulation pump (31) are operated, and the brine circulation pump (31) is operated. The low-temperature brine cooled to below-freezing temperature circulates as shown in FIG. 3, and ice is formed around the heat exchanger (32) incorporated in the ice heat storage tank (20). It accumulates in the heat storage tank (20). The ice heat storage tank (20) is provided with a temperature measuring device (71), and the water stored in the ice heat storage tank (20) is 5 ° C. based on the water temperature value detected by the temperature measuring device (71). When it is determined that the water has been converted to water, the brine refrigerator (30) and the brine circulation pump (31) are operated.

(Control action during heat radiation operation)
Next, the control operation of the heat storage device during the heat radiation operation will be described with reference to FIG. During the heat dissipation operation, it is performed during the daytime when the heat load (50) such as an air conditioner is used, and the heat stored as ice in the ice heat storage tank (20) is dissipated at night to dissipate the heat load ( 50), the water held in the low temperature tank (13) to be supplied is cooled.

  First, at the time of heat radiation operation, as shown in FIG. 4, the circulation pump (1) and the circulation pump (2) are operated, and 5 ° C. water held in the low temperature tank (13) is air-conditioned through the circulation pipe (100). Water is supplied to a thermal load (50) such as a machine. And in heat load (50), such as an air conditioner, 5 degreeC water sent through the circulation pipe (100) is thermally converted into 15 degreeC water, and water is sent to a high temperature tank (11). Further, 15 ° C. water held in the high-temperature tank (11) is supplied to the ice heat storage tank (20) through the circulation pipe (200), and the ice is made around the heat exchanger (32) incorporated in the ice heat storage tank (20). The formed ice is gradually melted and supplied to the low-temperature tank (13) as 5 ° C. cooling water. During the heat radiation operation, the valve opening degree of the water control valve (60) is determined based on the water temperature value detected by the temperature measuring device (70) provided between the ice heat storage tank (20) and the low temperature tank (13). Adjust the temperature of the cold water supplied to the low temperature tank (13) to 5 ° C by bypassing a part of the water that is sent to the ice heat storage tank (20) through the circulation pipe (200) and diverting it to the cold water bypass pipe (61). Will be set. Moreover, since the ice in the ice heat storage tank (20) is melted using 15 ° C. water held in the high temperature tank (11), the water after the ice in the ice heat storage tank (20) is completely melted. The temperature will be 15 ° C.

  Thus, the heat storage device according to the present invention cools the 15 ° C. water held by the high temperature bath (11) to 5 ° C. water in the water cooler (40) during the heat storage operation, and cools the low temperature bath (13). Water. And 15 degreeC water which an ice thermal storage tank (20) holds is sent to a high temperature tank (11) through a circulation pipe (400), and 5 degreeC water which a low temperature tank (13) holds is stored in an ice thermal storage tank (20). The water stored in the ice heat storage tank (20) is converted into 5 ° C. water. When the water is converted to 5 ° C., the circulation pump (4) is stopped and the brine refrigerator (30) and the brine circulation pump (31) are operated to generate ice in the ice heat storage tank (20). . Due to the control during this heat storage operation, the brine refrigeration machine (30) with low efficiency is operated to generate ice from water at 15 ° C, so that ice is generated from water at 5 ° C. It is possible to reduce the power consumption until the 15 ° C. water is cooled to 5 ° C.

  For example, the cooling heat necessary for cooling 1000 kg of water from 15 ° C. to 5 ° C. is 1000 × (15−5) ÷ 3024 = 3.3 (RT). If a brine refrigerator having an efficiency of 1.3 (kWh / RT) is used to generate this cold heat, 1.3 × 3.3 = 4.29 (kWh) of electric power is required. According to the present invention, since this cold heat is generated by a relatively high-efficiency water cooler, assuming that the efficiency of the water cooler is 0.8 (kWh / RT), 0.8 × 3 The power of 3 = 2.64 (kWh) is necessary, and the power of 4.29-2.64 = 1.65 (kWh) can be reduced as compared with the case where the brine refrigerator is used. Note that RT is a unit of heat, 1RT = 3024 kcal (in the case of US RT), and 1 Kwh / RT indicates that 1 kWh is necessary for generating 3024 kcal cold.

Next, a second embodiment will be described.
In the first embodiment, as shown in FIG. 1, a circulation pump (4) and a circulation pipe (400) for feeding water from an ice heat storage tank (20) to a high temperature tank (11) are connected to an ice heat storage tank (20 ) And the high-temperature tank (11), 15 ° C. water held in the ice heat storage tank (20) is sent to the high-temperature tank (11) through the circulation pipe (400), and the low-temperature tank (13) Converting the water in the ice heat storage tank (20) to 5 ° C water by flowing the 5 ° C water held into the ice heat storage tank (20), and then generating ice in the ice heat storage tank (20). However, the second embodiment uses a circulation pump (2) and a circulation pipe (200) for supplying 15 ° C. water held in the high temperature tank (11) to the ice heat storage tank (20) during the heat radiation operation. In the heat storage operation, the water stored in the ice storage tank (20) is caused to flow into the high temperature tank (11), so that the low temperature tank (13) The 5 ° C. water held to be flowed into the ice heat storage tank (20). Hereinafter, the control operation of the heat storage device in the second embodiment will be described with reference to FIG. 5 to FIG. 7 separately for the heat storage operation and the heat radiation operation.

(Control action during heat storage operation)
First, the control operation of the heat storage device during the heat storage operation in the second embodiment will be described with reference to FIGS. 5 and 6.

  First, at the time of heat storage operation, the circulation pump (1) is stopped and water supply control is stopped. Then, as shown in FIG. 5, the circulation pump (2) and the circulation pump (3) are operated, and the water cooler (40) is supplied through the circulation pipe (300) to the 15 ° C. water held in the high-temperature tank (11). The water at 15 ° C. is cooled to 5 ° C. water in the water cooler (40). And the cooled 5 degreeC water is sent to a low temperature tank (13), and 5 degreeC water is stored in a low temperature tank (13). Moreover, 15 degreeC water which an ice thermal storage tank (20) holds is sent to a high temperature tank (11) through a circulation pipe (200), and 5 degreeC water which a low temperature tank (13) holds is stored in an ice thermal storage tank (20). The water stored in the ice heat storage tank (20) is converted into 5 ° C. water. At this time, the valve opening degree of the water control valve (60) is controlled so as not to divert to the cold water bypass pipe (61).

  Next, when it is determined that the water stored in the ice heat storage tank (20) has been converted to 5 ° C., the brine refrigerator (30) and the brine circulation pump (31) are operated, and the brine circulation pump (31) The low-temperature brine cooled to below-freezing temperature circulates as shown in FIG. 6, and ice is formed around the heat exchanger (32) incorporated in the ice heat storage tank (20). Ice is stored in the heat storage tank (20). The ice heat storage tank (20) is provided with a temperature measuring device (71), and the water stored in the ice heat storage tank (20) is kept at 5 ° C by the water temperature value detected by the temperature measuring device (71). When it determines with having converted, a brine refrigerator (30) and a brine circulation pump (31) will be drive | operated.

(Control action during heat radiation operation)
Next, the control operation of the heat storage device during the heat radiation operation will be described with reference to FIG.

  First, at the time of heat radiation operation, the direction of water supply by the circulation pump (2) is switched, and the circulation pump (1) and the circulation pump (2) are operated as shown in FIG. The 5 ° C. water held is sent to the heat load (50) such as an air conditioner through the circulation pipe (100). And in heat load (50), such as an air conditioner, 5 degreeC water sent through the circulation pipe (100) is converted into 15 degreeC water, and water is sent to a high temperature tank (11). Further, 15 ° C. water held in the high-temperature tank (11) is supplied to the ice heat storage tank (20) through the circulation pipe (200), and the ice is made around the heat exchanger (32) incorporated in the ice heat storage tank (20). The formed ice is gradually melted and supplied to the low-temperature tank (13) as 5 ° C. cooling water.

  As described above, the heat storage device in the second embodiment switches the water feeding direction by the circulation pump (2) between the heat radiation operation and the heat storage operation, and is held at 15 ° C. held in the ice heat storage tank (20). Water is sent to the high temperature tank (11) through the circulation pipe (200), and 5 ° C water held in the low temperature tank (13) is caused to flow into the ice heat storage tank (20) to be held in the ice heat storage tank (20). After converting the water to 5 ° C. water, ice was generated in the ice heat storage tank (20), and the inefficient brine refrigerator (30) was operated to generate ice from 15 ° C. water. Since control generates ice from 5 ° C. water, it is possible to reduce power consumption until the 15 ° C. water is cooled to 5 ° C.

Next, a third embodiment will be described.
In the first embodiment and the second embodiment, the heat load (50) such as an air conditioner is operated during the heat radiation operation, and is stopped during the heat storage operation such as at night. In the third embodiment, The heat load (50) such as an air conditioner is operated regardless of the heat dissipation operation during the daytime or the heat storage operation during the nighttime. This is because in an office building or the like, the heat load (50) such as an air conditioner is stopped at night, but a factory or the like often operates for 24 hours. Similarly, the water cooler (40) can be operated regardless of the heat dissipation operation or the heat storage operation. It is also possible to control the number of water coolers (40) to be operated more at night and to be less operated at daytime.

  The above-described embodiments are preferred embodiments of the present invention, and can be implemented in various forms without departing from the gist of the present invention. For example, it is possible to provide a plurality of circulation pumps (1) and circulation pipes (100) that constitute the heat storage device, and it is also possible to increase or decrease the number of operating units according to the heat load (50) such as an air conditioner. . It is also possible to provide a plurality of water coolers (40), and the number of operating units can be increased or decreased depending on the purpose. It is also possible to provide a plurality of brine refrigerators (30).

  The heat storage device and the heat storage control method according to the present invention can be applied to an air conditioning (cooling) system for buildings such as buildings and factories.

It is a figure which shows schematic structure of the thermal storage apparatus in 1st Example concerning this invention. It is a 1st figure which shows the control action at the time of the thermal storage driving | operation of the thermal storage apparatus in 1st Example concerning this invention, and is a figure which shows the control action before driving | operating a brine refrigerator. It is a 2nd figure which shows the control action at the time of the heat storage driving | operation of the heat storage apparatus in 1st Example concerning this invention, and is a figure which shows the control action at the time of driving a brine refrigerator. It is a figure which shows the control action at the time of the thermal radiation operation of the thermal storage apparatus in 1st Example concerning this invention. It is a 1st figure which shows the control action at the time of the thermal storage driving | operation of the thermal storage apparatus in 2nd Example concerning this invention, and is a figure which shows the control action before driving a brine refrigerator. It is a 2nd figure which shows the control action at the time of the heat storage driving | operation of the heat storage apparatus in 2nd Example concerning this invention, and is a figure which shows the control action at the time of drive | operating a brine refrigerator. It is a figure which shows the control action at the time of the thermal radiation driving | operation of the thermal storage apparatus in 2nd Example concerning this invention. It is a figure which shows schematic structure of the conventional heat storage apparatus. It is a figure which shows the detailed internal structure of the intermediate | middle tank which the conventional heat storage apparatus comprises. It is a figure which shows the detailed internal structure of the ice thermal storage tank which the conventional heat storage apparatus comprises. It is a figure which shows the control action at the time of the heat storage driving | operation of the conventional heat storage apparatus. It is a figure which shows the control action at the time of the thermal radiation operation of the conventional heat storage apparatus.

Explanation of symbols

1, 2, 3, 4 Circulation pump 10 Cold water tank 11 High temperature tank 12 Intermediate tank 13 Low temperature tank 20 Ice heat storage tank 30 Brine refrigerator 31 Brine circulation pump 32 Heat exchanger 40 Water cooler 50 Heat load of air conditioner 60 Water control Valve 61 Cold water bypass pipe 70, 71 Temperature measuring instrument 100, 200, 300, 400 Circulation pipe

Claims (8)

A refrigerant liquid tank and a heat storage tank that hold the refrigerant liquid, the refrigerant liquid tank is at least divided into a high-temperature tank and a low-temperature tank, and the temperature of the high-temperature refrigerant liquid that the high-temperature tank holds is the temperature of the low-temperature tank It is a heat storage device that is higher than the temperature of the low-temperature refrigerant liquid it owns,
During heat storage operation,
Supplying the low-temperature refrigerant liquid held in the low-temperature tank to the heat storage tank, and cooling the supplied low-temperature refrigerant liquid in the heat storage tank to generate a solidified body;
During heat dissipation operation,
The high-temperature refrigerant liquid held by the high-temperature tank is supplied to the heat storage tank, the solidified body generated in the heat storage tank is dissolved to generate a low-temperature refrigerant liquid, and the generated low-temperature refrigerant liquid is supplied to the low-temperature tank. the low-temperature refrigerant liquid supplied to the cryostat, performed by supplying a cooling load to be cold demand side heat exchanger, and control means for supplying a high temperature refrigerant liquid generated by heat exchange in the hot bath,
In the heat storage tank, having a detecting means for detecting the temperature of the refrigerant liquid held by the heat storage tank,
The control means includes
When the temperature of the refrigerant liquid in the heat storage tank detected by the detection means becomes the temperature of the low-temperature refrigerant liquid after starting the process of supplying the low-temperature refrigerant liquid held by the low-temperature tank to the heat storage tank In addition, the low-temperature refrigerant liquid supplied to the heat storage tank is cooled in the heat storage tank to generate a solidified body . Have a cooler,
The control means includes
The cooler is operated during a heat storage operation, the high-temperature refrigerant liquid held in the high-temperature tank is cooled in the cooler to generate a low-temperature refrigerant liquid, the generated low-temperature refrigerant liquid is supplied to the low-temperature tank, and the supply The heat storage device according to claim 1, wherein the supplied low-temperature refrigerant liquid is supplied to the heat storage tank, and the supplied low-temperature refrigerant liquid is cooled in the heat storage tank to generate a solidified body. First supply means for supplying the high-temperature tank with the refrigerant liquid held by the heat storage tank;
A second supply means for supplying the high-temperature refrigerant liquid held by the high-temperature tank to the heat storage tank;
The control means includes
During the heat storage operation, the first supply means supplies the refrigerant liquid held by the heat storage tank to the high temperature tank, supplies the low temperature refrigerant liquid held by the low temperature tank to the heat storage tank, and supplies the supplied low temperature refrigerant. The liquid is cooled in the heat storage tank to produce a solidified body,
During the heat radiation operation, the second supply means supplies the high-temperature refrigerant liquid held in the high-temperature tank to the heat storage tank, dissolves the solidified body generated in the heat storage tank, and generates a low-temperature refrigerant liquid, The heat storage device according to claim 1 or 2, wherein the generated low-temperature refrigerant liquid is supplied to the low-temperature tank. Supply means capable of both supplying the high-temperature refrigerant liquid held by the high-temperature tank to the heat storage tank and supplying the refrigerant liquid held by the heat storage tank to the high-temperature tank;
The control means includes
During the heat storage operation, the supply means supplies the refrigerant liquid held by the heat storage tank to the high temperature tank, supplies the low temperature refrigerant liquid of the low temperature tank to the heat storage tank, and supplies the supplied low temperature refrigerant liquid to the heat storage tank. Cooling inside to produce a solidified body,
During the heat radiation operation, the supply means supplies the high-temperature refrigerant liquid held in the high-temperature tank to the heat storage tank, dissolves the solidified body generated in the heat storage tank, generates a low-temperature refrigerant liquid, and the generated low-temperature refrigerant liquid The heat storage device according to claim 1, wherein a refrigerant liquid is supplied to the low-temperature tank. The heat storage device according to any one of claims 1 to 4 , wherein the refrigerant liquid is water. A refrigerant liquid tank that holds the refrigerant liquid and a heat storage tank, wherein the refrigerant liquid tank is at least divided into a high temperature tank and a low temperature tank, and the temperature of the high temperature refrigerant liquid that the high temperature tank holds is the temperature of the low temperature tank A heat storage control method that is performed by a heat storage device that is higher than the temperature of the low-temperature refrigerant liquid that it holds,
A heat storage step of supplying a low-temperature refrigerant liquid held in the low-temperature tank to the heat storage tank, cooling the supplied low-temperature refrigerant liquid in the heat storage tank to generate a solidified body, and accumulating cold heat during a heat storage operation;
During the heat radiation operation, the high-temperature refrigerant liquid held in the high-temperature tank is supplied to the heat storage tank, the solidified body generated in the heat storage tank is melted to generate a low-temperature refrigerant liquid, and the generated low-temperature refrigerant liquid is A heat dissipation step of supplying the high-temperature refrigerant liquid generated by the heat exchange to the tank, supplying the low-temperature refrigerant liquid supplied to the low-temperature tank to the cold load on the cold demand side to perform heat exchange and, the possess,
The heat storage step
After starting the process of supplying the low-temperature refrigerant liquid held by the low-temperature tank to the heat storage tank, when the temperature of the refrigerant liquid in the heat storage tank becomes the temperature of the low-temperature refrigerant liquid, the heat storage tank A heat storage control method , wherein the supplied low-temperature refrigerant liquid is cooled in the heat storage tank to generate a solidified body . First supply means for supplying the high-temperature tank with the refrigerant liquid held by the heat storage tank;
A second supply means for supplying the high-temperature refrigerant liquid held by the high-temperature tank to the heat storage tank;
The heat storage step
The first supply means supplies the refrigerant liquid held by the heat storage tank to the high temperature tank, supplies the low temperature refrigerant liquid held by the low temperature tank to the heat storage tank, and supplies the supplied low temperature refrigerant liquid to the heat storage tank. Cool in the tank to produce a solidified body,
The heat dissipation step
The second supply means supplies the high-temperature refrigerant liquid held in the high-temperature tank to the heat storage tank, dissolves the solidified body generated in the heat storage tank, generates a low-temperature refrigerant liquid, and the generated low-temperature refrigerant The heat storage control method according to claim 6 , wherein a liquid is supplied to the low-temperature tank. Supply means capable of both supplying the high-temperature refrigerant liquid held by the high-temperature tank to the heat storage tank and supplying the refrigerant liquid held by the heat storage tank to the high-temperature tank;
The heat storage step
The supply means supplies the refrigerant liquid held in the heat storage tank to the high temperature tank, supplies the low temperature refrigerant liquid of the low temperature tank to the heat storage tank, and cools the supplied low temperature refrigerant liquid in the heat storage tank. To produce a solidified body
The heat dissipation step
By the supply means, the high-temperature refrigerant liquid held in the high-temperature tank is supplied to the heat storage tank, the solidified body generated in the heat storage tank is dissolved to generate a low-temperature refrigerant liquid, and the generated low-temperature refrigerant liquid is The heat storage control method according to claim 6 , wherein the heat storage control method is supplied to a low-temperature tank.

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