JP2001221467A - Air conditioning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an air conditioning system for heating/cooling the rooms of a building, e.g. an office building or an apartment house, in which initial cost and running cost are reduced while saving the space. SOLUTION: The air conditioning system comprises a heat source facility 4 performing cooling by circulating chilled water from refrigerating machines 2, 3 to an air handling unit 18 and a fan coil unit 19 through water supply pipes 7, 8, 9, 12, 13. A mobile thermal storage unit 29 comprises a thermal storage tank 31 coupled with the water supply pipe 9 through a bypath and storing a heat exchangeable latent heat storage material, and a truck 30 which can transport it to the heat source facility 4. The heat source facility 4 and the mobile thermal storage unit 29 are used in combination in a season of high cooling demand and cooling operation is performed using only the heat source facility 4 in other seasons. Consequently, the capacity of the heat source facility 4 can be lowered while dealing with peak load.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning system for cooling and heating the interior of a building such as an office building or an apartment house.

[0002]

2. Description of the Related Art FIG. 3 is a schematic diagram showing an example of a conventional air conditioning system, FIG. 4 is a graph showing a daily cooling load, (a) is a graph showing an intermediate load curve, and (b) is a graph showing an intermediate load curve. )
Is a graph showing a summer load curve.

Conventionally, as this type of air conditioning system 51, as shown in FIG. 3, refrigerators 52, 53, an air handling unit 68, and a fan coil unit 69 are connected by water pipes 57, 58, 62, 63. , Pump 55, 5
6, a type in which a coolant such as cold water obtained by the refrigerators 52 and 53 is circulated and supplied to the air handling unit 68 and the fan coil unit 69 through the headers 65 and 66 by using the refrigerators 52 and 53 is often used.

[0004]

However, due to the recent spread of OA equipment, higher airtightness of sashes, and strengthened heat insulation, the heating load in winter has been reduced, but FIG.
As shown in (b), the cooling load in the summer and the middle period tends to increase year by year.
The heat source capacity must be designed for peak load over several hours (until time). As a result, not only the initial cost rises due to the enlargement of the equipment (refrigerators 52 and 53, air handling unit 68, fan coil unit 69, pumps 55 and 56, etc.) constituting the air conditioning system 51, but also the power load As a result, the running cost also rises, and the space for installing the air conditioning system 51 becomes large.

[0005] In view of such circumstances, an object of the present invention is to provide an air conditioning system capable of reducing initial costs and running costs and realizing space saving.

[0006]

SUMMARY OF THE INVENTION In the present invention, the amount of peak load is assumed, and a smaller capacity is selected to reduce the size of the air conditioning system. By performing the peak cut, it is possible to cope with the peak load.

[0007] That is, the present invention according to claim 1 is an air conditioning system provided with a heat source facility for circulating and supplying a heat medium from a cold heat source device to a air conditioner through a medium flow path to perform cooling and heating. A mobile heat storage device is provided which is provided with a heat storage tank which is connected to the flow path by bypass and stores a latent heat storage material capable of exchanging heat, and transport means capable of transporting the heat storage tank to the heat source equipment.

[0008] By adopting such a configuration, the peak load can be obtained by using the heat source equipment and the mobile heat storage device together in the season when the demand for cooling and heating is large, and performing the cooling and heating operation using only the own heat source equipment in other seasons. And the capacity of the heat source equipment can be reduced.

According to a second aspect of the present invention, there is provided an air conditioning system having a heat source facility for circulating and supplying a refrigerant from a refrigerator through a medium flow path to an air conditioner for cooling.
A heat storage tank having a latent heat storage material that is connected to the medium flow path by bypass and exchanges heat and stores the heat storage tank, and a transfer unit that can transfer the heat storage tank to the heat source equipment is provided. You.

With this configuration, the heat source equipment and the mobile heat storage device are used in combination during the season when cooling demand is high, and the cooling operation is performed using only the heat source equipment during other seasons, so that the heat source equipment can be handled while responding to the peak load. Capacity can be reduced.

Further, according to the present invention, as the heat storage tank, a partition plate is provided in a casing to form a plurality of heat storage areas, and these heat storage areas are formed by a medium flow path in the casing. It is configured by adopting a heat storage tank that communicates in a meandering manner.

With this configuration, the generation of dead water in the heat storage tank is suppressed, the stagnation portion is reduced, and the time during which the heat medium or the refrigerant stays in the heat storage tank is increased, so that the heat exchange efficiency in the heat storage tank is improved. improves.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic configuration diagram showing an embodiment of an air conditioning system according to the present invention, and FIG. 2 is a perspective view of a heat storage tank of the air conditioning system shown in FIG.

As shown in FIG. 1, the air conditioning system 1 includes a heat source equipment 4 capable of covering a predetermined cooling load L1 and a mobile heat storage device 29 capable of covering a predetermined cooling load L2. The heat storage device 29 can be bypass-connected to the medium flow path (water supply pipes 7, 8, 9, 12, 13) of the heat source equipment 4.

That is, the heat source equipment 4 includes two water pipes 7,
The water pipes 7 and 8 are provided with refrigerators 2 and 3 and pumps 5 and 6, respectively. Further, headers 15 and 16 are connected to the upstream end and the downstream end of the water pipes 7 and 8, respectively. Also, the header 16
Is connected to a header 17 via a water pipe 9, and the water pipe 9 is provided with an on-off valve 21. On the upstream and downstream sides of the on-off valve 21, bypass branch pipes 10, 1
1 is branched from the water supply pipe 9 and piped. On / off valves 22 and 23 are interposed in the bypass branch pipes 10 and 11, respectively. Also, between the header 17 and the header 15, 2
The water pipes 12 and 13 are piped, and each water pipe 1
The air handling unit 18 and
The fan coil unit 19 is interposed as an air conditioner.

On the other hand, the mobile heat storage device 29 is
The heat storage tank 31 is provided on the bed of the truck 30.
Is placed. As shown in FIG. 2, the heat storage tank 31 has a rectangular parallelepiped casing 35, and the casing 35 is made of a material having excellent heat insulation (FRP, steel plate, or the like). Further, two partition plates 36 and 37 are attached in the casing 35, and the inside of the casing 35 is equally divided into three heat storage areas S1, S2 and S3 by the partition plates 36 and 37. here,
These heat storage areas S1, S2, and S3 communicate with each other alternately up and down. That is, since one partition plate 36 is provided so as to stand up from the bottom surface of the casing 35, the two heat storage regions S1 and S2 located on both sides of the partition plate 36 communicate with each other at the upper portion, and the other partition plate Since the plate 37 is provided so as to hang down from the upper surface of the casing 35,
Two heat storage areas S2 located on both sides of the partition plate 37,
S3 communicates with each other at the bottom. A latent heat storage material (not shown) in sherbet-like ice or a spherical capsule is stored as a latent heat storage material in all the heat storage regions S1, S2, and S3. Manholes 38, 39, and 40 of each heat storage area S
1, S2, and S3 are formed. Also, bypass pipes 32, 3 are provided on both left and right surfaces of the casing 35, respectively.
3 are connected, and on-off valves 41 and 42 are interposed in the bypass pipes 32 and 33, respectively. As shown in FIG. 1, the bypass pipes 32 and 33 are detachably connected to the bypass branch pipes 10 and 11 by connecting portions 25 and 26, respectively.

Since the air-conditioning system 1 has the above-described configuration, when the air-conditioning system 1 is operated, only the heat source equipment 4 is sufficient in consideration of the amount of cooling demand, or the mobile heat storage device 29 is used. After it is determined whether or not it is necessary to carry the air conditioner, a necessary and sufficient cooling operation corresponding to the cooling demand is performed based on the determination result.

First, during the season when cooling demand is relatively small, such as in the interim period, as shown in FIG. 4 (a), it is possible to cope with only the heat source equipment 4, and as described below, the medium flow path of the heat source equipment 4 ( Cooling operation is performed by flowing cold water as a refrigerant through the water pipes 7, 8, 9, 12, 13).

That is, the mobile heat storage device 2 is
9 is not connected (at this time, on-off valves 22, 2
3, 41 and 42 are closed. ), The pumps 5 and 6 are driven after the on-off valve 21 is opened. Then, after the water in the water pipes 7 and 8 is cooled by the refrigerators 2 and 3, the water flows from the header 16 to the header 17 via the water pipe 9, and the air handling unit 18 via the water pipes 12 and 13.
After removing heat from the fan coil unit 19, the header 15
Return to the water pipes 7, 8. By repeating such an operation, the living room where the air handling unit 18 and the fan coil unit 19 are installed is cooled.

At this time, even in the daytime peak, as shown in FIG. 4A, since the cooling load L1 that can be covered by the heat source equipment 4 does not exceed, the heat source equipment 4 alone does not rely on the mobile heat storage device 29. The cooling operation can be sufficiently performed.

Next, when cooling demand is high, such as in summer,
As shown in FIG. 4B, the cooling operation using only the heat source equipment 4 cannot cover the cooling load L2 exceeding the predetermined cooling load L1, and therefore, as described below, the heat source equipment 4 and the mobile heat storage device 29. Chilled water and bypass branch pipes 10, 1
1. Cooling operation is performed by circulating supply via bypass pipes 32 and 33.

That is, first, the mobile heat storage device 29 is carried in the vicinity of the heat source equipment 4, and the heat storage tank 31 of the mobile heat storage device 29 is bypass-connected to the medium flow path of the heat source equipment 4. As shown in FIG. 1, the truck 30 is stopped together with the heat storage tank 31 in a parking lot or the like near the heat source equipment 4, and the bypass pipe 3
2 and 33 are connected to bypass branches 10 and 11. Thus, the heat storage tank 31 of the mobile heat storage device 29 is in a state of being bypass-connected to the medium flow path of the heat source equipment 4.

In this state, the on-off valve 21 is closed and the on-off valves 22, 23, 41, 42 are opened, and then the pumps 5, 6 are driven. Then, the returned water whose temperature has been raised by heat exchange by the air handling unit 18 and the fan coil unit 19 is supplied from the header 17 to the heat storage tank 31 through the bypass branch pipe 11 and the bypass pipe 33, where heat exchange is performed. The cooling is performed by an amount corresponding to the cooling load L2. At this time, the inside of the casing 35 of the heat storage tank 31
The heat storage regions S1, S2, and S3 are divided into three heat storage regions S1, S2, and S3.
3 communicates alternately with the upper and lower sides, so that the water flowing into the heat storage tank 31 passes through the heat storage areas S1, S2, and S3 sequentially meandering up and down in the casing 35. As a result, a situation in which a dead water area occurs in the heat storage tank 31 can be suppressed, the stagnation portion can be reduced, and the time during which water stays in the heat storage tank 31 can be prolonged. Heat exchange can be performed with high efficiency.

Thereafter, the return water thus cooled flows into the header 16 through the bypass pipe 32 and the bypass branch pipe 10, and is supplied to the refrigerators 2 and 3 through the water supply pipes 7 and 8, where heat is exchanged. The cooling is performed by an amount corresponding to the cooling load L1.
Further, the air handling unit 18 and the fan coil unit 19 pass through the water pipes 12 and 13 from the header 15.
Return to By repeating such an operation, the living room where the air handling unit 18 and the fan coil unit 19 are installed is cooled.

That is, in this case, the water supplied to the air handling unit 18 and the fan coil unit 19 is cooled in two stages by the refrigerators 2 and 3 and the heat storage tank 31, so that it can cope with the peak load in the daytime in summer. become able to. At this time, as shown in FIG. 4B, the peak load can be cut for the cooling load L <b> 2 exceeding the cooling load L <b> 1 that can be covered by the heat source equipment 4 in a form covered by the mobile heat storage device 29. The heat source equipment 4 can be reduced in size accordingly.

As described above, when the cooling demand is relatively small, the heat source equipment 4 is used alone, and only when the cooling demand is large, the mobile heat storage device 29 is used together. Since the operation can be performed, the initial cost and the running cost of the air conditioning system 1 can be reduced, and the space saving of the air conditioning system 1 can be realized.

The capacity of the heat storage tank 31 is desirably about three hours a day for about one week in operation. However, if the transportation of the heat storage tank 31 does not take much time, the heat storage tank 31 is mounted. If a plurality of trucks 30 are prepared and the switching arrangement of the heat storage tank 31 is executed every two or three days, avoiding the peak hours during the day, the capacity of the heat storage tank 31 can be reduced. . The latent heat storage material contained in the sherbet-like ice or spherical capsule stored in the heat storage tank 31 is preferably manufactured at low cost by using the waste heat of the factory or the nighttime electric power. Running cost can be further reduced.

Also, the existing heat source equipment 4 can be connected and used together with the mobile heat storage device 29 as long as the piping work is performed and the bypass branch pipes 10 and 11 are additionally provided. This air conditioning system 1 can be used easily.

By the way, in the above-described embodiment, the case where sherbet-like ice or spherical capsules are used as the latent heat storage material has been described. However, the latent heat storage material is not limited to this. (STorag
Of course, a latent heat storage material using e of Latent heat can be used.

In the above-described embodiment, the case where the peak of the cooling load is cut has been described. However, a latent heat storage material capable of storing a high temperature is employed, and a cooling / heating heat source device is installed in place of the refrigerators 2 and 3. By using the heat medium instead of the refrigerant, the peak cut of the heating load as well as the cooling load can be similarly executed.

Further, in the above-described embodiment, the case where the truck 30 is used as the transport means of the heat storage tank 31 has been described, but a transport means other than the truck 30 may be used.

In the above-described embodiment, the case where the air handling unit 18 and the fan coil unit 19 are employed as the air conditioner has been described. However, the present invention is applied to an air conditioning system using other air conditioners. It is also possible.

Further, in the above-described embodiment, the partition plates 36 and 37 are mounted in the heat storage tank 31 to thereby store the heat storage areas S 1 and S 1.
When S2 and S3 are divided and formed, these heat storage regions S1 and S3
S2 and S3 are communicated alternately up and down so that the medium flow path in the casing 35 meanders up and down. However, the communicating position between the heat storage areas S1, S2 and S3 is not limited to the up and down. For example, the heat storage areas S1, S2,
The medium passage in the casing 35 may meander left and right by alternately communicating S3 with the left and right. It is also conceivable to install the heat storage tank 31 vertically upright.

[0035]

As described above, according to the first aspect of the present invention, the heat source equipment and the mobile heat storage device are used together when the demand for cooling and heating is high, and only the own heat source equipment is used during the other seasons. An air conditioning system that can reduce the initial cost and running cost and realize space savings because the capacity of the heat source equipment can be reduced while responding to the peak load by performing the cooling and heating operation. Can be provided.

According to the second aspect of the present invention,
By using both the heat source equipment and the mobile heat storage device during periods of high cooling demand, and performing cooling operation using only the heat source equipment during other periods, the capacity of the heat source equipment can be reduced while responding to peak loads. Therefore, it is possible to provide an air-conditioning system capable of reducing initial costs and running costs and realizing space saving.

Further, according to the present invention, the generation of dead water in the heat storage tank is suppressed, the stagnation portion is reduced, and the time during which the heat medium or the refrigerant stays in the heat storage tank is increased. As a result, the heat exchange efficiency of the heat storage tank is improved, and the cooling and heating capacity of the mobile heat storage device can be increased.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram illustrating an embodiment of an air conditioning system according to the present invention.

FIG. 2 is a perspective view of a heat storage tank of the air conditioning system shown in FIG.

FIG. 3 is a schematic configuration diagram illustrating an example of a conventional air conditioning system.

4A and 4B are graphs showing a daily cooling load, in which FIG. 4A is a graph showing an intermediate load curve, and FIG. 4B is a graph showing a summer load curve.

[Explanation of symbols]

 1 ... air conditioning system 2, 3 ... refrigerator (cold heat source device) 4 ... heat source equipment 7, 8, 9 ... water supply pipe (medium flow path) 10, 11 ... bypass branch pipe 12, 13 ... Water pipe (medium flow path) 18 Air handling unit (air conditioner) 19 Fan coil unit (air conditioner) 29 Mobile heat storage device 30 Truck (transportation means) 31 Heat storage tank 32 , 33 ... bypass pipe 35 ... casing 36, 37 ... partition plate S1, S2, S3 ... heat storage area

Claims (3)

[Claims] An air conditioning system having a heat source facility for circulating and supplying a heat medium from a cold heat source device to a air conditioner through a medium flow path to perform cooling and heating. An air conditioning system comprising: a mobile heat storage device including a heat storage tank in which a latent heat storage material is stored, and a transfer unit that can transfer the heat storage tank to the heat source equipment. 2. An air conditioning system comprising a heat source device for circulating and supplying a refrigerant from a refrigerator through a medium flow path to an air conditioner to perform cooling, wherein latent heat bypass-connected to the medium flow path and capable of exchanging heat. An air conditioning system, comprising: a mobile heat storage device including a heat storage tank in which a heat storage material is stored, and a transfer unit that can transfer the heat storage tank to the heat source facility. 3. A heat storage tank in which a partition plate is provided in a casing to divide a plurality of heat storage areas, and the heat storage areas communicate with each other so that a medium flow path in the casing is meandering. The air conditioning system according to claim 1 or 2, wherein the air conditioning system is employed.