JP2001021283A - Refrigerating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform agitation of a heat storage medium where energy conservation is taken into consideration. SOLUTION: This refrigerating device has a storage type heat exchanger 40 stored in a thermal storage tank 31 and is provided with a circulating circuit 20 in which a heating medium circulates. An utilization side circuit 70 in which the water in the utilization side circulates is connected to the circulating circuit 20 through a main heat exchanger 22. An air supply pipe 53 is connected to the thermal storage tank 31, and the air supply pipe 53 is provided with an air pump 52. A water temperature sensor Th3 which detects the temperature of the water in the utilization side circuit 70 is provided. When the detected temperature of the water temperature sensor Th3 becomes within a predetermined temperature range, the air pump 52 is driven to perform air agitation in the thermal storage tank 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating apparatus for storing ice heat, and more particularly to a measure for controlling stirring of a heat storage medium.

[0002]

2. Description of the Related Art Conventionally, there has been known an ice heat storage device that cools and freezes a heat storage medium such as water stored in a heat storage tank and stores cold heat as latent heat of the heat storage medium. In recent years, ice heat storage devices
It is used in combination with an air conditioner. That is, while making ice at night and storing cold heat, cooling operation is performed using the stored cold heat during daytime. With such an operation, the operation cost of the air conditioner is reduced by using inexpensive late-night power, and the power demand at night and during the day is leveled.

[0003] An ice heat storage device is disclosed in Japanese Patent Application Laid-Open No. 7-3014.
As disclosed in Japanese Patent Publication No. 38, there is known a so-called static type adopting an internal melting system. In this type of heat storage device, a heat storage medium such as water is stored in a heat storage tank, and a heat transfer tube is disposed in the heat storage tank. Then, at the time of ice making, a heat medium cooled by a refrigerator or the like is passed through a heat transfer tube,
Freeze the heat storage medium in the heat storage tank. On the other hand, when using cold heat, the heat medium of the heat transfer tubes is cooled by a frozen heat storage medium, that is, iced material, and the cooled heat medium is transported to an indoor heat exchanger or the like to perform cooling or the like.

[0004]

In the above-mentioned conventional ice heat storage device, there is a problem that if the utilization operation for extracting cold heat is continued, the performance of extracting cold heat is sharply reduced.

[0005] That is, at the time of using cold heat, the iced material generated around the heat transfer tube melts, and a gap is generated between the heat transfer tube and the iced material. As a result, the heat medium in the heat transfer tubes must exchange heat with the iced product via both the heat transfer tubes and the liquid phase heat storage medium. The heat transfer between the heat transfer tube and the iced material is performed by natural convection of the liquid phase heat storage medium existing in the gap. For this reason, the amount of heat exchange between the heat medium in the heat transfer tube and the iced product is reduced, and the performance of extracting cold heat is reduced.

Therefore, the applicant of the present application has proposed that air is supplied to a gap between the heat transfer tube and the icing material to stir the heat storage medium in the gap. However, there is a problem in that when air is constantly supplied at the time of using cold heat, energy saving is contrary.

[0007] The present invention has been made in view of the above points, and has as its object to stir a heat storage medium for energy saving.

[0008]

<Summary of the Invention> According to the present invention, the heat storage medium is stirred only under predetermined conditions.

<Solution> Specifically, as shown in FIG. 1, the means adopted by the present invention has a heat storage heat exchanger (40) housed in a heat storage tank (31) and circulates a heat medium. A refrigerating apparatus is provided that has a circulation circuit (20) that performs cooling and cools the heat storage medium in the heat storage tank (31) to perform ice heat storage. Further, an air supply means (5A) for supplying air into the heat storage tank (31) to stir the heat storage medium is provided. Then, when a predetermined driving condition is reached, the air supply means (5A) is driven to stir the air in the heat storage tank (31).

[0010] The present invention also relates to the air supply means (5A).
However, an air supply pipe (53) introduced into the heat storage tank (31) and an air pump (52) provided in the air supply pipe (53) may be provided. Then, a temperature detecting means (Th1) for detecting the outside air temperature may be provided. In addition, when the temperature detected by the temperature detecting means (Th1) falls within a predetermined temperature range,
Stirring control means (81) for driving the air pump (52) of the air supply means (5A) may be provided.

Further, the present invention provides the air supply means (5A)
However, an air supply pipe (53) introduced into the heat storage tank (31) and an air pump (52) provided in the air supply pipe (53) may be provided. Then, a temperature detecting means (Th2) for detecting the temperature of the heat medium in the circulation circuit (20) may be provided. In addition, a stirring control means (81) for driving the air pump (52) of the air supply means (5A) when the temperature detected by the temperature detection means (Th2) falls within a predetermined temperature range may be provided.

At this time, it is preferable that the temperature detecting means (Th2) detects the temperature of the heat medium at the outlet side of the heat storage heat exchanger (40) of the circulation circuit (20).

Further, in the present invention, the use side circuit (70) in which the use side heat medium circulates may be connected to the circulation circuit (20) via the main heat exchanger (22). Further, the air supply means (5A) is provided with an air supply pipe (5A) introduced into the heat storage tank (31).
3) and an air pump (5) provided in the air supply pipe (53).
2) may be provided. Then, the user side circuit (7
0) temperature detection means (Th
3) may be provided. In addition, a stirring control means (81) for driving the air pump (52) of the air supply means (5A) when the temperature detected by the temperature detection means (Th3) falls within a predetermined temperature range may be provided.

In this case, it is preferable that the temperature detecting means (Th3) detects the temperature of the use side heat medium at the outlet side of the main heat exchanger (22) of the use side circuit (70).

Further, according to the present invention, the air supply means (5A)
An air supply pipe (53) introduced into the heat storage tank (31) and an air pump (52) provided in the air supply pipe (53) may be provided. Then, a timer (82) for counting the time may be provided. In addition, when the time of the timer (82) reaches a predetermined time, the air pump (5
A stirring control means (81) for driving 2) may be provided.

That is, according to the present invention, after the defrosting operation is started, when a predetermined driving condition is reached, the air supply means (5A) is driven to stir the air in the heat storage tank (31). For example, after starting the thawing operation, the outside air temperature is measured, and the stirring control means (81) determines whether or not the outside air temperature has become equal to or higher than a predetermined temperature.

When the outside air temperature reaches a predetermined temperature, the stirring control means (81) turns on the air pump (52), and the heat storage tank (31)
The air is supplied to, for example, a gap (33) formed around the heat transfer tube (41).

Thereafter, when the outside air temperature falls below a predetermined temperature, the stirring control means (81) turns on the air pump (52).
FF is performed, and the air supply to the gap (33) is stopped.

Further, in another invention, after the de-icing operation is started, the temperature of the heat medium in the circulation circuit (20) or the utilization side circuit (7
0) The temperature of the heat medium is measured, and the stirring control means (81)
It is determined whether or not the heat medium temperature has become equal to or higher than a predetermined temperature.

When the temperature of the heat medium reaches a predetermined temperature, the stirring control means (81) turns on the air pump (52) and turns on the heat storage tank (3).
Air is supplied to 1), for example, into a gap (33) formed around the heat transfer tube (41).

Thereafter, when the temperature of the heat medium drops below a predetermined temperature, the stirring control means (81) turns off the air pump (52) and stops the air supply to the gap (33).

In another aspect of the invention, after starting the de-icing operation, the current time is measured, and the stirring control means (81) determines whether or not a predetermined time has come.

At a predetermined time, the stirring control means (81)
Turns on the air pump (52), supplies air to the heat storage tank (31), and sends air into, for example, a gap (33) formed around the heat transfer tube (41).

Thereafter, when a predetermined time has elapsed and a predetermined time has come, the stirring control means (81) turns off the air pump (52).
Then, the air supply to the gap (33) is stopped.

[0025]

Therefore, according to the present invention, the air is supplied to the heat storage tank (31) under a predetermined condition, so that the energy can be saved reliably.

In particular, when the air pump (52) is driven only when necessary, wasteful energy consumption can be reliably suppressed.

In particular, when the demand for cooling heat increases, the air pump (52) is driven, so that it is possible to reliably cope with the load and to improve the comfort of air conditioning.

Further, if the stirring control is performed by detecting the temperature of the use-side heat medium, it is possible to control the extraction of cold heat directly corresponding to the load.

Further, if the agitation control is performed according to the current time, the thawing can be concentrated only in a predetermined time zone.

[0030]

Embodiment 1 Hereinafter, Embodiment 1 of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, the ice heat storage device (30)
A circulation circuit (20) and a heat storage tank (31) are provided. The ice heat storage device (30) is of a static type and of an internal melting type. The ice heat storage device (30) performs a cold storage operation in which the water in the heat storage tank (31) is frozen to store cold heat, and a warm heat storage operation in which the water in the heat storage tank (31) is heated to store warm heat. Is configured to do so.

A use side circuit (70) is connected to the circulation circuit (20) of the ice heat storage device (30) to constitute a refrigeration system for performing air conditioning by using the stored cold or warm heat.

[0033] The circulation circuit (20) includes a blusher (21), a heat storage heat exchanger (40), and a main heat exchanger (22).
And a circulation pump (23) are connected in order by a brine pipe (24). The circulation circuit (20) is filled with brine as a heat medium. When the circulation pump (23) is operated, the brine circulates in the circulation circuit (20).

In the circulation circuit (20), the main heat exchanger (2
A first bypass pipe (25) for bypassing 2) and a second bypass pipe (26) for bypassing the heat storage heat exchanger (40) are provided.

One end of the first bypass pipe (25) is connected between the heat storage heat exchanger (40) and the main heat exchanger (22). The other end of the first bypass pipe (25) is connected between the main heat exchanger (22) and the circulation pump (23) via a first three-way valve (27).

One end of the second bypass pipe (26) is connected between the blusher (21) and the ice heat storage device (30). The other end of the second bypass pipe (26) is
The three-way valve (28) is connected between the ice heat storage device (30) and the main heat exchanger (22).

Although not shown, the blusher (21) includes a refrigerant circuit. In this refrigerant circuit, the refrigerant circulates, and switching between a refrigeration cycle operation and a heat pump cycle operation is performed. And Blincher (21)
Is configured to switch between cooling of brine by a refrigeration cycle operation in a refrigerant circuit and heating of brine by a heat pump cycle operation.

The use side circuit (70) is connected to the main heat exchanger (2
2), use side heat exchanger (71), use side pump (72)
And are sequentially connected by piping. The use-side circuit (70) is filled with water as a use-side heat medium. When the use-side pump (72) is operated, water is supplied between the main heat exchanger (22) and the use-side heat exchanger (71). Circulates. Although not shown, the use side heat exchanger (71) is provided in a so-called fan coil unit, and exchanges heat between water circulating in the use side circuit (70) and room air. The main heat exchanger (22) exchanges heat between brine circulating in the circulation circuit (20) and water circulating in the utilization side circuit (70).

As shown in FIGS. 2 and 3, the heat storage heat exchanger (40) is installed inside a heat storage tank (31).
The heat storage tank (31) is formed in a rectangular parallelepiped shape, and stores water as a heat storage medium therein.

The heat storage heat exchanger (40) includes a plurality of heat transfer tubes (41). The heat transfer tube (41) is formed in a shape in which a straight straight pipe portion (42) and a semicircular curved pipe portion (43, 44) are alternately continuous and meander up and down. Among the curved pipe sections (43, 44), the one located at the upper end side of the straight pipe section (42) is configured as the upper curved pipe section (43), and the one located at the lower end side is the lower curved pipe section. (44).

The heat transfer tube (41) is constituted by a cross-linked polyethylene tube (JIS K6769). Here, a two-layer crosslinked polyethylene pipe having a non-crosslinked layer formed on the outer periphery of the crosslinked layer is used. In addition, you may use the crosslinked polyethylene pipe of a single layer structure formed only with the crosslinked layer.

The plurality of heat transfer tubes (41) are arranged at regular intervals, and one end is connected to the inlet header (45), and the other end is connected to the outlet header (46).

As shown in FIG. 4, a fixing plate (60) which is a fixing member (60) is provided between the heat transfer tubes (41).
Is provided. The fixing plates (60) are provided three at equal intervals in the vertical direction, and the heat transfer tubes (4
It is configured to support the straight pipe section (42) of 1).
Further, among the fixing plates (60), air pipes (50) are integrally attached to the fixing plates (60) installed at the lowest stage in the straight pipe portion (42) of the heat transfer tube (41). .

One frame (47) formed in a frame shape is provided on both sides of the heat transfer tubes (41) arranged as described above. An end of the fixing plate (60) is attached and fixed to the frame (47).

The inlet header (4) of the heat storage heat exchanger (40)
The outlet header (46) is connected to the main heat exchanger (22) while the outlet header (46) is connected to the blusher (21).
The heat storage heat exchanger (40) is configured to exchange heat between brine in the heat transfer tube (41) and water in the heat storage tank (31). This heat exchange cools the water in the heat storage tank (31) and freezes around the heat transfer tube (41) to produce ice (32).

Each air pipe (5) of the heat storage heat exchanger (40)
0) is connected to an air supply pipe (53). The air supply pipe (53) extends outside the heat storage tank (31) and opens into the air. In addition, the air supply pipe (5
3) is provided with an air pump (52). And
The air pipes (50), the air pump (52), and the air supply pipe (53) constitute air supply means (5A) that takes in air and supplies the air to the air pipes (50).

Next, the fixed plate (60) and the air pipe (5
The configuration 0) will be described with reference to FIGS.

The fixed plate (60) is a heat storage heat exchanger (40)
Are formed in a plate shape having a predetermined width corresponding to an installation interval of each heat transfer tube (41). On both sides of the fixing plate (60), at positions corresponding to the straight pipes (42) of the heat transfer tubes (41),
A plurality of support holes (61) are formed. The support hole (61)
Are formed one by one corresponding to each straight pipe portion (42). The support hole (61) is formed in a C-shape that opens toward the side surface of the fixing plate (60).

The straight pipe portion (42) of the heat transfer tube (41) fits into the support hole (61) from the side of the fixing plate (60). That is, the fixed plate (60) supports the straight pipe portions (42) of the heat transfer tubes (41) located on both sides thereof, and the two heat transfer tubes (41) are fixed by one fixed plate (60). Have been.

The air pipes (50) are integrally attached one by one to the lowermost fixing plate (60). FIG.
The ice (32) around the heat transfer tube (41) melts and the heat transfer tube (4
This shows a state in which a gap (33) has occurred between 1) and ice (32). The air pipe (50) is provided along substantially the entire length of the fixed plate (60) along the longitudinal direction of the fixed plate (60) (see FIG. 2). The air pipe (50) is formed to have a predetermined diameter so as to contact two heat transfer tubes (41) adjacent to the fixing plate (60).

As shown in FIG. 4, a blow hole (51) for blowing air is formed in the air pipe (50). The outlet holes (51) are formed one by one corresponding to the straight pipe portions (42) of the heat transfer tubes (41). In other words, the above-mentioned air outlet (5
1) is formed not only on the front side in FIG. 4 but also on the heat transfer tube (41) on the back side. The outlet (51)
Is formed on the side of the lower half of the air pipe (50),
The air pipe (50) is configured to open downward.

The air pipe (50) is connected to an air supply pipe (53).
Is blown out from the blowing hole (51), and the air is supplied to the vicinity of the heat transfer tube (41). The air blown out from the blow-out hole (51) is supplied to the heat transfer tube (41) and ice (3
It flows into the gap (33) created between 2), and flows inside the gap (33) by buoyancy along the straight pipe portion (42) of the heat transfer tube (41).

On the other hand, the blincher is provided with an outside air temperature sensor (Th1) which is a temperature detecting means. The outside air temperature sensor (Th1) detects an outside air temperature and outputs a detection signal.

The drive of the air pump (52) is controlled by a controller (80). The controller (80) is provided with a detection signal of the outside air temperature sensor (Th1) and a stirring control means (81). When the temperature detected by the outside air temperature sensor (Th1) falls within a predetermined temperature range, the agitation control means (81) sets the air supply means (5A)
The air pump (52) is driven.
In other words, the agitation control means (81) supplies air to the gap (33) between the heat transfer tube (41) and the ice (32) when the predetermined condition is reached during the utilization cooling operation using cold heat, and It is configured to stir water as a medium.

<Operation> Next, the operation of the above-described refrigeration system will be described.

-Cold heat storage operation- First, the cold heat storage operation is performed during nighttime when indoor cooling becomes unnecessary.
The operation is performed by operating the blincher (21) with cheap midnight power. During the cold heat storage operation, the use side pump (72) is stopped, and the circulation of water in the use side circuit (70) is not performed. Further, during the cold storage operation, the air pump (52) is stopped, and air is not supplied from the air pipe (50).

During the cold storage operation, the first three-way valve (27) shuts off the main heat exchanger (22) and connects the first bypass pipe (25), and the brine is connected to the main heat exchanger (22). ) And flows through the first bypass pipe (25). On the other hand, the second three-way valve (28) shuts off the second bypass pipe (26) and connects the heat storage heat exchanger (40), and the brine flows through the heat storage heat exchanger (40). In other words, in the circulation circuit (20), the brinkler (21) and the heat storage heat exchanger (4
The brine circulates between 0).

In the brine chiller (21), the brine is cooled by the refrigeration cycle operation of the refrigerant circuit. The brine cooled by the blincher (21) flows into the inlet header (45) of the heat storage heat exchanger (40) and flows through each heat transfer tube (41), during which the water in the heat storage tank (31) is removed. Heat exchange. The water in the heat storage tank (31) is cooled and cooled by low-temperature brine, and ice (32) is generated and grows around the heat transfer tube (41). After that, the brine is returned to the blusher (21), cooled, sent to the heat storage heat exchanger (40) again, and repeats this circulation.

As described above, in the cold heat storage operation, ice is produced by the cold generated by the brush chiller (21). Therefore, the cold heat of the blusher (21) is stored in the heat storage tank (31) as latent heat of water as a heat storage medium. This cold heat storage operation is continued until the amount of ice (32) in the heat storage tank (31), that is, the amount of ice making reaches a predetermined value. In addition, the amount of ice making
It is detected based on, for example, a change in water level in the heat storage tank (31).

-Used Cooling Operation- Next, the operation during the used cooling operation will be described.

The use cooling operation is performed mainly for cooling the room in the daytime by utilizing the cold energy stored by the cold heat storage operation. In addition, as the use cooling operation, both the peak shift operation and the peak cut operation are performed.

At the time of the peak shift operation, the cooling heat stored in the cold heat storage operation is taken out, and at the same time, the cooling operation is also performed by operating the brush chiller (21). In other words, in the peak shift operation, the cooling load is handled by using both the cold generated by the brush chiller (21) and the cold stored in the heat storage tank (31). Therefore, at the time of the peak shift operation, the power consumption for the defrosting operation is reduced, and the power demand during the day is reduced.

During the peak shift operation, the first three-way valve (2
7) shuts off the first bypass pipe (25) and shuts off the main heat exchanger (2).
2) The side is in communication, and the brine flows into the main heat exchanger (22). On the other hand, the second three-way valve (28) shuts off the second bypass pipe (26) and connects the heat storage heat exchanger (40), and the brine flows through the heat storage heat exchanger (40). That is, in the circulation circuit (20), the brine circulates in the order of the blusher (21), the heat storage heat exchanger (40), and the main heat exchanger (22).

In the brine chiller (21), the brine is cooled by the refrigeration cycle operation of the refrigerant circuit. The temperature of the brine at the time of flowing out of the blusher (21) is set higher than that during the cold storage operation. The brine cooled by the blincher (21) flows into the inlet header (45) of the heat storage heat exchanger (40) and is distributed to each heat transfer tube (41). The distributed brine flows through the heat transfer tube (41), during which it exchanges heat with the ice (32) in the heat storage tank (31) to be further cooled.

The brine cooled by the heat storage heat exchanger (40) flows into the main heat exchanger (22). In the main heat exchanger (22), the low-temperature brine and the water in the use side circuit (70) exchange heat, and the water in the use side circuit (70) is cooled. The brine that has absorbed heat in the main heat exchanger (22) is sent again to the blusher (21) through the circulation pump (23), and repeats this circulation.

In the utilization side circuit (70), the main heat exchanger (22)
Water circulates between the heat exchanger and the use side heat exchanger (71). The water cooled in the main heat exchanger (22) flows into the use-side heat exchanger (71) and exchanges heat with room air to cool the room air. The water that has absorbed heat from the room air is sent to the main heat exchanger (22) by the use-side pump (72) and repeats this circulation.

On the other hand, the peak cut operation is an operation in which the brush chiller (21) is stopped and cooling is performed using only the cold stored in the heat storage tank (31). Therefore, during peak cut operation, the power consumption of the brush chiller (21) becomes zero, and daytime power demand is reduced.

During the peak cut operation, the circulation circuit (20)
, The brine circulates as in the peak shift operation. At that time, the blinch chiller (21) is stopped, and the brine simply flows into the heat storage heat exchanger (40) through the blinch chiller (21). The brine exchanges heat with the ice (32) in the heat storage tank (31) while flowing through the heat storage heat exchanger (40) and is cooled. That is, the cooling of the brine is performed only in the heat storage heat exchanger (40). Only this point is different from the peak shift operation.

During the peak shift operation and the peak cut operation, the brine absorbed by the main heat exchanger (22) is sent to the heat storage heat exchanger (40). The brine flows through the heat transfer tube (41) and exchanges heat with the ice (32) in the heat storage tank (31). Therefore, the ice (32) melts around the heat transfer tube (41), and a gap (33) is generated between the heat transfer tube (41) and the ice (32) (see FIG. 5). This gap (33) is filled with water as a liquid phase.

When the air pump (52) is operated in this state, air is sent into the air pipe (50) through the air supply pipe (53). This air is blown out from the blowout hole (51) of the air pipe (50), and is supplied to the vicinity of the straight pipe portion (42) of the heat transfer tube (41). That is, air is sent into the gap (33) formed around the heat transfer tube (41) by the air pipe (50).

The air supplied to the gap (33) flows upward along the straight pipe portion (42) of the heat transfer tube (41) by buoyancy. Due to the flow of the air, the water in the gap (33) is stirred, and forced convection occurs. Here, the heat storage heat exchanger (40) is arranged in such a manner that the upper curved pipe portion (43) of the heat transfer tube (41) projects above the water surface. Therefore, the gap (33)
Is supplied through the gap (33) and discharged from the water surface into the air.

-Agitation Control- The control of the air pump (52), that is, the agitation control of water will now be described with reference to FIG.

First, in step ST11, a utilization cooling operation, which is a de-icing operation, is started, and then in step ST12.
And measure the outside air temperature. That is, after the controller (80) captures the detection signal of the outside air temperature sensor (Th1), the process proceeds to step ST13. In this step ST13, the stirring control means (81) determines whether or not the outside air temperature becomes higher than 28 ° C, and returns to step ST12 until the outside air temperature becomes higher than 28 ° C.

On the other hand, if the outside air temperature becomes higher than 28 ° C., the determination in step ST13 becomes YES, and the process proceeds to step ST14. In this step ST14,
The stirring control means (81) turns on the air pump (52), and as described above, the gap (33) formed around the heat transfer tube (41).
In the air.

Thereafter, the process proceeds from step ST14 to step ST15, in which it is determined whether or not the outside air temperature has dropped below 25 ° C., and the process returns to step ST14 until the outside air temperature has dropped below 25 ° C.

On the other hand, when the outside air temperature falls below 25 ° C., the determination in step ST15 becomes YES, and the process proceeds to step ST16. In this step ST16, the stirring control means (81) turns off the air pump (52).
Then, the air supply to the gap (33) is stopped.

In short, when the outside air temperature increases, the load increases, and the required heat amount of the use-side heat exchanger (71) increases, the stirring control drives the air pump (52) to increase the amount of cold heat taken out. Let it.

-Heat storage operation- Next, the operation during the heat storage operation will be described as another operation.

The warm heat storage operation is performed by operating the brush chiller (21) with inexpensive midnight power during the night when indoor heating is not required. During the warm heat storage operation, the use side pump (72) is stopped, and the circulation of water in the use side circuit (70) is not performed. Further, during the heat storage operation, the air pump (52) is stopped, and air is not supplied from the air pipe (50).

During the warm heat storage operation, the first three-way valve (27) and the second three-way valve (28) are set in the same manner as in the cold heat storage operation described above, and the blincher (21) and the heat storage heat exchanger (40) are connected. Brine circulates between.

In the brine chiller (21), the brine is heated by the heat pump cycle operation of the refrigerant circuit. The brine heated by the blincher (21) flows into the inlet header (45) of the heat storage heat exchanger (40) and is distributed to each heat transfer tube (41). The distributed brine flows in the heat transfer tube (41), and exchanges heat with water in the heat storage tank (31) during that time. The water in the heat storage tank (31) is heated by high-temperature brine. Then, the heat generated by the brush chiller (21) is stored in the heat storage tank (31) as sensible heat of water as a heat storage medium. Afterwards, the brine is replaced by a blincher (2
It returns to 1), is heated, is sent to the heat storage heat exchanger (40) again, and repeats this circulation.

-Used Heating Operation- Finally, the operation during the used heating operation will be described.

The use heating operation is performed to heat the room mainly in the daytime using the heat stored by the heat storage operation. In addition, as the use heating operation, both the peak shift operation and the peak cut operation are performed.

At the time of the peak shift operation, the heat stored in the heat storage tank (31) is taken out by the heat storage operation, and at the same time, the brush chiller (21) is also operated to perform heating. And
In the circulation circuit (20), the first three-way valve (27) and the second three-way valve (28) are set in the same manner as in the above-mentioned use cooling operation, and the blincher (21), the heat storage heat exchanger (40), Heat exchanger (2
The brine circulates in the order of 2).

In the brine chiller (21), the brine is heated by the heat pump cycle operation of the refrigerant circuit. The brine is sent to the heat storage heat exchanger (40), further heated by the hot water in the heat storage tank (31), and then sent to the main heat exchanger (22). In the main heat exchanger (22), the high-temperature brine and the water in the use side circuit (70) exchange heat, and the water in the use side circuit (70) is heated. The brine radiated by the main heat exchanger (22) is sent again to the blusher (21) through the circulation pump (23), and repeats the circulation.

In the use side circuit (70), the main heat exchanger (22)
Water circulates between the heat exchanger and the use side heat exchanger (71). The water heated in the main heat exchanger (22) flows into the use-side heat exchanger (71) and exchanges heat with room air to heat the room air. The water radiated to the indoor air is sent to the main heat exchanger (22) by the use side pump (72), and repeats this circulation.

On the other hand, in the peak cut operation, the brine chiller (21) is stopped and the brine is circulated between the heat storage heat exchanger (40) and the main heat exchanger (22) as in the above-mentioned use cooling operation. Let it be done. And for peak cut operation,
Heating is performed using only the heat stored in the heat storage tank (31).

<Effect of First Embodiment> As described above, according to the present embodiment, the air is stored in the heat storage tank (31) when the predetermined condition is satisfied.
, It is possible to reliably save energy.

In particular, since the air pump (52) is driven only when necessary, wasteful consumption of energy can be reliably suppressed.

Further, when the demand for the cooling heat increases, the air pump (52) is driven, so that it is possible to surely cope with the load and to improve the comfort of the air conditioning.

Further, the air supply means (5A) supplies air to the vicinity of the heat transfer tube (41). Therefore, air can be reliably sent to the gap (33) generated around the heat transfer tube (41) due to the melting of the ice (32).
For this reason, forced convection can be generated in the liquid phase of the gap (33), and heat transfer between the ice (32) and the heat transfer tube (41) can be promoted. As a result, a sufficient amount of heat exchange between the ice (32) and the brine in the heat transfer tube (41) can be ensured, and the cold heat extraction performance during the use operation can be maintained at a high level.

Further, since the cold-heat extracting performance can be maintained at a high level, even when the amount of ice (32) remaining in the heat storage tank (31) becomes small, the cold can be sufficiently extracted. Therefore, even in a state where the amount of the ice (32) remaining in the heat storage tank (31) is reduced, it is possible to sufficiently extract the cold heat. Therefore, the ice (32) in the heat storage tank (31)
However, the problem that cold heat cannot be taken out despite the presence of the residual heat can be avoided.

Further, the cold stored in the heat storage tank (31) can be fully utilized and the loss of energy due to residual ice can be reduced.

[0094]

Second Embodiment Next, a second embodiment of the present invention will be described with reference to the drawings.

In this embodiment, as shown in FIG. 7, air stirring control is performed by brine temperature instead of Embodiment 1 which controls air stirring by the outside air temperature.

As shown in FIG. 1, a brine temperature sensor (Th2) for detecting a brine temperature is provided downstream of the second three-way valve (28) in the circulation circuit (20). That is, the brine temperature sensor (Th2) is connected to the circulation circuit (2
This is temperature detection means for detecting the temperature of the brine at the outlet side of the heat storage heat exchanger (40) of (0).

When the temperature detected by the brine temperature sensor (Th2) falls within a predetermined temperature range, the stirring control means (81) of the controller (80) drives the air pump (52) of the air supply means (5A). Is configured.

The control of the air pump (52) will be described with reference to FIG. This control operation is basically the same as in the first embodiment (see FIG. 6).

First, after the utilization cooling operation, which is the thawing operation, is started (step ST21), the brine temperature is measured (step ST22). Subsequently, the stirring control means (8
In 1), it is determined whether or not the brine temperature has become higher than 5.5 ° C. (step ST23).

When the brine temperature becomes higher than 5.5 ° C., the stirring control means (81) turns on the air pump (52) (step ST24), and the gap (3) around the heat transfer pipe (41).
3) Blow air.

Thereafter, it is determined whether or not the brine temperature has dropped to 3.5 ° C. or less (step ST25). When the brine temperature has dropped to 3.5 ° C. or less, the stirring control means (81) sets the air pump (52). ) Is turned off, and the air supply to the gap (33) is stopped (step ST26).
Other configurations, operations and effects are the same as those of the first embodiment.

[0102]

Third Embodiment Next, a third embodiment of the present invention will be described with reference to the drawings.

In the present embodiment, as shown in FIG. 8, instead of Embodiment 1 performing the air stirring control based on the outside air temperature, the air stirring control is performed based on the use-side water temperature which is the temperature of the use-side heat medium. Is what you do.

As shown in FIG. 1, a water temperature sensor (Th3) for detecting the use-side water temperature is provided downstream of the main heat exchanger (22) in the use-side circuit (70). That is, the water temperature sensor (Th3) is temperature detecting means for detecting the water temperature at the outlet side of the main heat exchanger (22) of the use side circuit (70).

When the temperature detected by the water temperature sensor (Th3) falls within a predetermined temperature range, the stirring control means (81) of the controller (80) controls the air pump (52) of the air supply means (5A).
Is configured to be driven.

The control of the air pump (52) will be described with reference to FIG. This control operation is basically the same as in the first embodiment (see FIG. 6).

First, after starting the use cooling operation, which is the de-icing operation (step ST31), the use side water temperature is measured (step ST32). Subsequently, the stirring control means (81)
Determines whether the use-side water temperature has become higher than 9 ° C. (step ST33).

When the use-side water temperature becomes higher than 9 ° C., the stirring control means (81) turns on the air pump (52) (step ST34) and sends air into the gap (33) around the heat transfer pipe (41).

Thereafter, it is determined whether or not the use-side water temperature has decreased to 7 ° C. or less (step ST35). When the use-side water temperature has decreased to 7 ° C. or less, the stirring control means (81) activates the air pump (52). Then, the air supply to the gap (33) is stopped (step ST36).

Therefore, in the present embodiment, since the stirring-side control is performed by detecting the use-side water temperature, it is possible to control the extraction of cold heat directly corresponding to the load. Other configurations, operations and effects are the same as those of the first embodiment.

[0111]

Fourth Embodiment Next, a fourth embodiment of the present invention will be described with reference to the drawings.

In the present embodiment, as shown in FIG. 9, instead of Embodiment 1 performing the air stirring control based on the outside air temperature, air stirring control is performed according to the time of day.

As shown in FIG. 1, the controller (80) is provided with a timer (82) for counting time. Also,
The stirring control means (81) of the controller (80) is configured to drive the air pump (52) of the air supply means (5A) when the time of the timer (82) falls within a predetermined time range.

The control of the air pump (52) will be described with reference to FIG. This control operation is basically the same as in the first embodiment (see FIG. 6).

First, after the utilization cooling operation, which is the deicing operation, is started (step ST41), the time is measured.
The time of the timer (82) is read (step ST42).
Subsequently, the stirring control means (81) determines whether or not the current time is 12:00 (step ST43).

When the current time reaches 12:00, the stirring control means (81) turns on the air pump (52) (step ST4).
4) Air is blown into the gap (33) around the heat transfer tube (41).

Thereafter, it is determined whether or not the current time has reached 15:00 (step ST45). When the current time has reached 15:00, the stirring control means (81) turns off the air pump (52).
Then, the supply of air to the gap (33) is stopped (step ST46).

Therefore, in this embodiment, since the agitation control is performed according to the current time, it is possible to concentrate the thawing only in a predetermined time zone. Other configurations, operations and effects are the same as those of the first embodiment.

[0119]

Other Embodiments In the above embodiment, the circulation circuit (20) circulates brine, but the present invention may be various types such as refrigerants.

Further, the present invention is not limited to the refrigeration system for performing air conditioning, and it is needless to say that various refrigeration systems may be used, and the circulation circuit (20) and the like are not limited to the embodiment.

[Brief description of the drawings]

FIG. 1 is a piping diagram of an ice heat storage device according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing a heat storage tank and a heat storage heat exchanger.

FIG. 3 is a schematic perspective view showing a configuration of a heat storage heat exchanger.

FIG. 4 is an enlarged perspective view showing a main part of the heat storage heat exchanger.

FIG. 5 is a cross-sectional view of a main part showing a cross section of the heat storage heat exchanger.

FIG. 6 is a control flowchart showing agitation control according to the first embodiment.

FIG. 7 is a control flowchart showing stirring control according to the second embodiment.

FIG. 8 is a control flowchart showing stirring control according to a third embodiment.

FIG. 9 is a control flowchart showing agitation control according to a fourth embodiment.

[Explanation of symbols]

 20 Circulation circuit 21 Brine chiller 22 Main heat exchanger 31 Heat storage tank 40 Heat storage heat exchanger 41 Heat transfer tube 5A Air supply means 50 Air pipe 52 Air pump 53 Air supply pipe 70 User side circuit 71 User side heat exchanger 80 Controller 81 Stirring control Means 82 Timer Th1 Outside temperature sensor (Temperature detection means) Th2 Brine temperature sensor (Temperature detection means) Th3 Water temperature sensor (Temperature detection means)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shoji Morii 1304 Kanaokacho, Sakai-shi, Osaka Daikin Industries Inside Sakai Seisakusho Kanaoka Plant

Claims (7)

[Claims] A circulating circuit (20) having a heat storage heat exchanger (40) housed in a heat storage tank (31) and circulating a heat medium, cooling the heat storage medium in the heat storage tank (31). An air supply means (5A) for supplying air into the heat storage tank (31) to agitate the heat storage medium, wherein the air supply means (5A) Drive the above heat storage tank (3
1) A refrigeration unit that stirs the air inside. 2. The air supply means (5A) according to claim 1, wherein the air supply pipe (53) introduced into the heat storage tank (31) and an air pump (52) provided in the air supply pipe (53). On the other hand, a temperature detection means (Th1) for detecting the outside air temperature is provided, and when the temperature detected by the temperature detection means (Th1) falls within a predetermined temperature range, the air pump (52) of the air supply means (5A) is turned on. A refrigerating device provided with a stirring control means (81) to be driven. 3. The air supply means (5A) according to claim 1, wherein the air supply pipe (53) introduced into the heat storage tank (31) and an air pump (52) provided in the air supply pipe (53). A temperature detecting means (Th2) for detecting the temperature of the heat medium in the circulation circuit (20), and when the temperature detected by the temperature detecting means (Th2) falls within a predetermined temperature range, the air supply means A refrigerating apparatus provided with a stirring control means (81) for driving the air pump (52) of (5A). 4. The refrigeration apparatus according to claim 3, wherein the temperature detecting means (Th2) detects a temperature of the heat medium at an outlet side of the heat storage heat exchanger (40) of the circulation circuit (20). 5. The air supply means (5A) according to claim 1, wherein the circulation circuit (20) is connected via a main heat exchanger (22) to a use side circuit (70) through which the use side heat medium circulates. ) Includes an air supply pipe (53) introduced into the heat storage tank (31) and an air pump (52) provided in the air supply pipe (53), while using the use side heat of the use side circuit (70). A temperature detecting means (Th3) for detecting the temperature of the medium is provided, and when the temperature detected by the temperature detecting means (Th3) falls within a predetermined temperature range, the air pump (52) of the air supply means (5A) is driven. A refrigerating device provided with a stirring control means (81). 6. The refrigerating apparatus according to claim 5, wherein the temperature detecting means (Th3) detects a temperature of the use side heat medium at an outlet side of the main heat exchanger (22) of the use side circuit (70). 7. The air supply means (5A) according to claim 1, wherein the air supply pipe (53) introduced into the heat storage tank (31) and an air pump (52) provided in the air supply pipe (53). On the other hand, a timer (82) for counting time is provided, and when the time of the timer (82) reaches a predetermined time, a stirring control means (81) for driving an air pump (52) of the air supply means (5A). Refrigeration equipment provided with.