JP2002168481A - Skeleton heat accumulative air conditioning system using heat accumulator in combination - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a skeleton heat accumulative air conditioning system using jointly an inexpensive heat accumulator not requiring large installation space. SOLUTION: This is the skeleton heat accumulative air conditioning system which supplies the air-conditioning air having absorbed heat from an air conditioner 11 and being sent from its air supply port 11a to a floor slab 3 through an air passage 21 so as to accumulates heat herein when the air conditioning into a room 1 is stopping on one hand, and takes in the air-conditioning air having absorbed heat in the above heat-accumulated floor slab 3 from the return port 11b of the air conditioner 11 at the time of indoor air conditioning on the other so as to recover the quantity of the above accumulated heat on the other. The above air passage 21 is provided with a latent heat accumulating body 41 which transfers latent heat, with its phase changing by heat exchange with the above air-conditioning air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reducing the peak heat load of an air conditioner during the air conditioning time period by recovering heat stored in a building frame when air conditioning in a room is stopped at night or the like during an air conditioning time such as daytime. The present invention relates to a skeleton thermal storage type air conditioning system to be reduced, and more particularly to a skeleton thermal storage type air conditioning system using a thermal storage device in combination.

[0002]

2. Description of the Related Art Conventionally, conditioned air heated or cooled by an air conditioner using midnight power is supplied to a floor slab of a building frame at night to store heat, and the heat is discharged from the floor slab during the day. 2. Description of the Related Art A frame heat storage device that reduces peak heat load of an air conditioner during an air conditioning time period by collecting the heat is used.

[0003] This frame heat storage device generally has a structure shown in FIG.
As shown in (a), when air conditioning for the room 1 is stopped, heat is absorbed from the air conditioner 11 and the air supply port 11 a
Is supplied to the floor slab 3 via the duct 22a and stored therein, while the air is supplied to the floor slab 3 during the air conditioning in the room, as shown in FIG. 3 (b). The air-conditioned air that has absorbed the heat is taken in from the return air opening 11b of the air conditioner 11 through the duct 22b, and the air-conditioner 11 further applies the heat to provide indoor air conditioning. In addition, the heat load of the air conditioner 11 is reduced. Note that the arrows in the figure indicate the flow of the conditioned air.

[0004] In recent years, by further contributing to the reduction of peak heat load by using a heat storage device in addition to the frame heat storage device, a contract with an electric power company under favorable conditions, which is cheaper than the regular one, has been made. In some cases, this is the case. Therefore, a skeleton thermal storage type air-conditioning system using a thermal storage device is being used. As the heat storage device, a water heat storage device that stores heat in water held in a heat storage tank, or an ice heat storage device that stores heat by converting the water into ice is used.

[0005]

However, these water / ice heat storage devices require a large installation space for a heat storage tank in addition to the increase in equipment cost, which is the reason for the heat storage type air conditioning system used in combination with the heat storage device. It has become a factor inhibiting the spread.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide an inexpensive heat storage type air conditioning system combined with an inexpensive heat storage device which does not require a large installation space.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, there is provided an air conditioner which absorbs heat from an air conditioner and sends out from an air supply port when air conditioning for a room is stopped. Air is supplied to the floor slab via the air flow path and stored therein, and during indoor air conditioning, the air stored in the floor slab absorbs the heat stored in the floor slab and is taken in from the air return port of the air conditioner to store the heat. A skeleton thermal storage type air conditioning system for recovering an amount, characterized in that a latent heat storage element that changes a phase by heat exchange with the conditioned air to transfer latent heat is provided in the air flow path.

[0008] According to the above invention, only by providing a latent heat storage element in the air flow path between the air supply port of the air conditioner and the floor slab as the frame heat storage apparatus, a frame heat storage air conditioning system using a heat storage apparatus in combination. Can be constructed. For this reason, it is possible to easily and inexpensively construct a skeleton heat storage air conditioning system using the heat storage device. In addition, since a latent heat storage element is used as the heat storage device and latent heat associated with the phase change can be stored, a large heat storage capacity can be secured as compared with the volume capacity of the heat storage element. Accordingly, the heat storage body can be reduced in size, and a large installation space is not required for installation. Further, since the latent heat storage element is provided in the air flow path, the heat storage performed when air conditioning in the room is stopped is performed by air-conditioning air that is absorbed and sent out from the air conditioner.
First, heat is stored in the latent heat storage body, and thereafter, heat is stored in the floor slab with the remaining residual heat of the conditioned air. Therefore, heat can be stored without waste.

According to a second aspect of the present invention, the latent heat storage element connected to a duct defining the air flow path is provided on the floor, in the building thermal storage type air conditioning system combined with the thermal storage apparatus according to the first aspect. It is arranged in a space above the ceiling formed between the slab and the ceiling panel. According to the invention, since the latent heat storage element is arranged in the space above the ceiling, the floor area in the room is not consumed for the arrangement. Therefore, the indoor space can be used effectively.

[0010] According to a third aspect of the present invention, in the frame heat storage type air conditioning system combined with the heat storage device according to the second aspect, the latent heat storage element is provided at an end of a duct close to a floor slab.
One of the two air-conditioning air inlet / outlet openings of the latent heat storage element is connected to the end of the duct, and the other is provided near the floor slab so that the air-conditioned air flows along the lower surface of the floor slab. And According to the above invention, the other opening is provided in proximity to the floor slab so that the conditioned air flows along the lower surface of the floor slab. This is performed while the air flows along the lower surface of the floor slab or until the temperature difference between the conditioned air and the floor slab disappears. Therefore,
The residual heat of the air can be taken for a long time and over a wide range of the floor slab, and the heat exchange efficiency from the conditioned air to the floor slab is excellent.

According to a fourth aspect of the present invention, in the frame heat storage type air conditioning system combined with the heat storage device according to any one of the second and third aspects, the end portion of the latent heat storage element is communicated with a duct so that the conditioned air is supplied to the latent heat storage element. A plurality of heat storage plates formed by holding a latent heat storage material in the shape of a flat plate having a smooth surface are arranged opposite to each other with a predetermined gap in the pipe to be flown, and a passage of conditioned air is provided between the heat storage plates by a pipe length. It is characterized by being formed along the direction.

According to the present invention, since a straight passage for the conditioned air can be provided in the pipe, the pressure loss when passing through the heat storage body can be significantly reduced. Also, since the passage can be provided on both sides of the heat storage plate,
The contact area between the conditioned air and the heat storage plate can be increased, and the heat exchange efficiency between the two can be maintained high. Furthermore, since the heat storage plates that are kept in a plate shape are arranged facing each other with a predetermined gap therebetween, the heat storage capacity per unit volume of the heat storage body can be increased by arranging them in a layered manner at a high density, and the size of the heat storage body can be reduced. I can do it.

[0013]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view showing an outline of an embodiment of a frame heat storage type air conditioning system of the present invention. FIG. 1 (a) shows a state at the time of heat storage, and FIG. 1 (b) recovers the heat storage amount. The state at the time of indoor air conditioning is shown. The arrows in the figure indicate the flow of the conditioned air, and the two two-way switching valves provided in the duct are shown as open and closed as black.

The air-conditioning air-conditioning system according to the present embodiment comprises:
When the air conditioning for the room 1 is stopped, FIG.
As shown in FIG. 2, the air-conditioned air that absorbs heat from the air conditioner 11 and is sent out from the air supply port 11a is supplied to the floor slab 3 through the proximity duct 21 disposed close to the floor slab 3, and the heat is stored therein. On the other hand, at the time of indoor air conditioning, FIG.
As shown in the figure, the air-conditioning air that has absorbed the heat stored in the floor slab 3 is taken in from the return air port 11b of the air conditioner 11 through the same proximity duct 21 as above to recover the heat storage amount. It is based on an air conditioning system. The feature thereof is that a latent heat storage element 41 is provided in the proximity duct 21 to exchange latent heat by phase change due to heat exchange with the conditioned air.

The room 1 is a part of a space surrounded by a concrete frame 5 as shown in FIG.
The concrete skeleton 5 includes upper and lower floor slabs 3 and 3a and a wall 7. In addition, concrete skeleton 5
Is formed by a plurality of floor slabs, and the illustrated example shows one layer. The floor slabs used for heat storage of the frame in each room 1 are the floor slabs 3 located on the ceiling side of each room 1.

A ceiling panel 9 is provided below the floor slab 3 on the ceiling side, thereby forming a space 8 above the ceiling between the floor slab 3 and the ceiling panel 9.
The room 1 which is a space to be air-conditioned is defined below the room.

The air conditioner 11 is disposed in the space 8 above the ceiling. The air conditioner 11 heats or cools the conditioned air taken in from the return air opening 11b, and then supplies the conditioned air supplied with the heat. It is a well-known package type air conditioner which is sent out from the port 11a and has a heat exchanger, a blower, a filter, and the like stored therein.

A duct 23 is connected to the air supply port 11a of the air conditioner 11, and this duct 23 is branched into two branches on the way.
It is connected to an indoor outlet 24 installed on the ceiling panel 9. In addition, the heat storage unit ventilation duct 23b serving as the other duct is provided.
Is connected to a latent heat storage element 41 fixed to the lower surface of the floor slab 3 in the space above the ceiling 8 and communicates with the space above the ceiling 8 via the latent heat storage element 41.

The air supply port 1 of the air conditioner 11 is controlled by a two-way switching valve 25 attached to the branch.
1a is selectively connected to one of the ducts 23a and 23b. That is, at the time of indoor air conditioning, as shown in FIG.
a from the indoor air duct 23
a while the air is blown into the room 1 via the
As shown in (a), the air is sent to the space 8 above the ceiling via the latent heat storage 41 via the heat storage air duct 23b.

The regenerator air duct 23b to which the latent heat regenerator 41 is connected is bifurcated in the middle 23c, and the branch end 23d connects the space above the ceiling 8 and the return air port 11b of the air conditioner 11. It is connected in the middle of the communicating return duct 27 and merges therewith. This return duct 27
The suction port 27b in the space 8 above the ceiling is connected to the inner wall 7a on the side opposite to the direction in which the conditioned air is blown out from the latent heat storage element 41.
, And the flow path of the conditioned air from the latent heat storage body 41 to the intake port 27b in the space behind the ceiling 8 is lengthened. This is to allow the conditioned air having residual heat sent from the latent heat storage element 41 to sufficiently supply the floor slab 3 of the under-the-ceiling space 8 with heat and return to the air conditioner 11 during heat storage described later. .

The junction is provided with a two-way switching valve 29, which can be used to store heat or air-condition the room.
The return air port 11b of the air conditioner 11 is selectively communicated with either the intake port 27b of the return duct 27 or the latent heat storage element 41. That is, at the time of heat storage, as shown in FIG. 1A, the conditioned air in the space above the ceiling 8 is taken into the air conditioner 11 from the intake port 27b via the return duct 27, while at the time of indoor air conditioning, as shown in FIG. As shown in b), the conditioned air is taken into the air conditioner 11 via the latent heat storage element 41.

In this case, the above-described proximity duct 21 refers to a portion from the end of the heat storage unit duct 23e to which the latent heat storage unit 41 is connected to the forked branch 23c.

As shown in FIG. 1 (b), the ceiling panel 9 has a ceiling return air port 9b for collecting the conditioned air in the room 1 into the space 8 above the ceiling. This ceiling air return 9b
Is formed in the ceiling panel 9 in the vicinity of the inner wall 7b opposite to the outlet suction port 43b of the latent heat storage element 41, and a flow path from the ceiling return air port 9b to the latent heat storage element 41 in the space above the ceiling 8 Has become as long as possible. For this reason, the amount of heat stored in the floor slab 3 is recovered at the time of indoor air conditioning to be described later. In this case, the conditioned air preheated by sufficiently exchanging heat with the floor slab 3 in the space 8 above the ceiling is used as latent heat storage. The air can be taken into the body 41, and as a result, rapid heating or rapid cooling of the conditioned air becomes possible.

As will be described below, the skeleton thermal storage type air-conditioning system having the above-described structure is controlled by the two two-way switching valves 25 and 29 in accordance with the time of heat storage and the time of air conditioning in the room for recovering the heat storage amount. It is operated by switching the circulation path of the conditioned air.

First, at the time of heat storage, as shown in FIG. 1A, the air supply port 11a of the air conditioner 11 is connected to the heat storage air blow duct 23b by the two-way switching valve 25.
Therefore, the conditioned air supplied with heat and sent out from the air supply port 11a is supplied to the latent heat storage 41 through the duct 23b.
Sent to and pass through. During this passage, the conditioned air is absorbed by the latent heat storage element 41, that is, the latent heat storage element 41
Is stored. Next, the conditioned air sent from the latent heat storage element 41 is blown onto the lower surface of the floor slab 3 in the space above the ceiling 8 and flows along the lower surface of the floor slab 3 to move. It is absorbed, that is, stored in the floor slab 3. Then, the conditioned air absorbed by the floor slab 3 is turned on the inner wall 7b, and then flows along the upper surface of the ceiling panel 9 to reach the inner wall 7b. Then, the air is taken into the return duct 27 from the intake port 27b adjacent thereto and collected from the return air port 11b of the air conditioner 11 connected by the two-way switching valve 29.
1 to form a circulation path in which heat is applied again and sent out again from the air supply port 11a.

On the other hand, during the air conditioning of the room for recovering the heat storage amount, as shown in FIG. 1B, the conditioned air of the room 1 is recovered from the ceiling return air opening 9b of the ceiling panel 9 to the space 8 above the ceiling. Then, while passing through the under-the-ceiling space 8, the heat is absorbed from the stored floor slab 3 and preheated, and then taken into the latent heat storage body 41. Then, the heat is further absorbed from the latent heat storage element 41 while passing through the latent heat storage element 41. Next, the conditioned air retains this heat, and the return air port 11b of the air conditioner 11 connected by the two-way switching valve 29 is provided.
, And further heated by the air conditioner 11.
At this time, the heat load of the air conditioner 11 is reduced due to the retained heat of the conditioned air. The conditioned air sent from the air supply port 11a of the air conditioner 11 is blown into the room 1 from the room outlet 24 of the ceiling panel 9 through the room air duct 23a connected by the two-way switching valve 25. Then, a circulation path is formed to be used for air conditioning in the room and to be recovered again from the above-mentioned ceiling return air opening 9b.

At the time of the air conditioning, the heat storage amount was recovered from both the floor slab 3 and the latent heat storage element 41. However, by switching the two-way switching valve 29, the floor slab was maintained while the heat storage amount of the latent heat storage element 41 was maintained. It is also possible to recover only the heat storage amount of No. 3. That is, only the two-way switching valve 29 is set to the open / closed state shown in FIG. 1A, that is, the return air port 11 b of the conditioned air 11 is changed to the intake port 27 of the return duct 27.
b, air may be taken into the air conditioner 11 without passing through the latent heat storage 41. This operation is mainly used during a time period when the heat load is small, and during a time period when the heat load is large, the operation of recovering the heat storage amount from both of the above is used.

Here, a preferred example of the latent heat storage element will be described. FIG. 2 shows a longitudinal sectional view of the entire latent heat storage element and an enlarged longitudinal sectional view of a main part thereof. This latent heat storage body 41 is a tubular body 43 having a rectangular cross section with open ends.
And a plurality of heat storage plates 45 in the form of a rectangular smooth plate provided in the pipe 43 in parallel with the pipe. One end 43a of the openings at both ends is connected to the end opening 23e of the latent-heat-air blowing duct 23, and
Is supported by the lower surface of the floor slab 3 and the pipe of the pipe 43 is horizontal. The other opening 43b is a blow-out suction port for blowing and sucking conditioned air, and is disposed immediately below the floor slab 3 in the vicinity.

The length of the heat storage plate 45 is slightly shorter than the tube length of the tube 43, and the width thereof is set to the same size as the inner dimension of the tube 43. Tube 43
Fixed to the inner surface. At this time, the plurality of heat storage plates 45 are opposed to each other in parallel with a predetermined gap s therebetween, and are arranged in parallel with the pipe of the pipe 43. The air-conditioned air flows straight in one direction through the gap s. Since the passage of the conditioned air is formed linearly by the gap s, the pressure loss when the conditioned air passes through the inside of the heat storage body 41 is significantly reduced. Further, since these passages are formed on both sides of each heat storage plate 45, the contact area between the conditioned air and the heat storage plate 45 can be increased, and the heat exchange efficiency between the two can be increased.

The heat storage plate 45 is formed by filling a latent heat storage material 45b in a thin rectangular container 45a having a rectangular parallelepiped having excellent heat conduction and closing the container. The outer shape of the container 45a is a flat plate, and is processed into a smooth surface with a small surface roughness. As the latent heat storage material 45b filled therein, a heat storage material that stores heat by a reversible phase change between a liquid phase and a solid phase is used.
As the heat storage material, for cooling, a paraffinic organic heat storage material having a liquid / solid phase change temperature set at 15 to 16 ° C., and for heating, the phase change An organic heat storage material whose temperature is set to 26 to 28 ° C. is preferable.

The other opening 43 of the tube 43
b, a flat-shaped airflow direction adjusting fin 47 is provided corresponding to the passage, and the airflow direction of the conditioned air blown out from the latent heat storage body 41 is directed obliquely upward, and the conditioned air is supplied to the lower surface of the floor slab 3. It flows along. Therefore,
The heat storage in the floor slab 3 is performed while the blown-out conditioned air flows along the lower surface of the floor slab 3 or until the temperature difference between the conditioned air and the floor slab disappears. Excess heat for a long time and floor slab 3
And the heat exchange efficiency from the conditioned air to the floor slab 3 is excellent.

When the latent heat storage element 41 is used for cooling, the latent heat storage element 41 composed of the cooling heat storage plate 45 is arranged on the lower surface of the floor slab 3 and used for heating. In this case, a latent heat storage element 41 including a heat storage plate 45 for heating is arranged. In the case of both cooling and heating, the latent heat storage unit for cooling and the heat storage unit for heating are connected in series, and a composite heat storage unit communicating the passages with each other is arranged on the lower surface of the floor slab 3. Is also good.

Although the embodiments of the present invention have been described above, the present invention is not limited to such embodiments, and the following modifications can be made without departing from the gist thereof.

In this embodiment, the package type air conditioner is arranged in the space above the ceiling. However, the arrangement place is not limited to this. For example, the air conditioner may be arranged inside and outside the room.

[0035]

As described above, according to the first aspect of the present invention, only by providing a latent heat storage element in an air flow path between an air conditioner and a floor slab, a frame heat storage air conditioning system combined with a heat storage device is provided. Can be easily and inexpensively constructed. For this reason, the existing frame heat storage system as well as the new one can be easily enhanced to a frame heat storage air conditioning system that uses a heat storage device together.

Further, since the latent heat storage element can be downsized and does not require a large installation space for installation, the degree of freedom in arranging the heat storage element is increased, and the degree of freedom in designing the system is increased.

According to the second aspect of the present invention, the indoor space can be effectively used, and for example, a large living space can be formed for the site area.

According to the third aspect of the present invention, since the heat exchange efficiency from the conditioned air to the floor slab is excellent, the heat can be stored in a short time and the mobility is excellent.

According to the fourth aspect of the present invention, since the pressure loss can be reduced and the heat exchange efficiency can be kept high, the energy efficiency of the entire frame heat storage air conditioning system can be improved.

Further, since the heat storage body can be miniaturized, the degree of freedom in space utilization increases, and the degree of freedom in designing the system increases.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an outline of an embodiment of a skeleton thermal storage type air conditioning system of the present invention. FIG. 1 (a) shows a state at the time of thermal storage, and FIG. Shows the state of air conditioning in a room.

FIG. 2 is a vertical sectional view showing the entirety of a latent heat storage element suitable for the present invention, and an enlarged vertical sectional view of a main part thereof.

FIG. 3 is a vertical cross-sectional view showing an outline of a conventional skeleton thermal storage type air conditioning system, and FIG.
(B) shows the state of the room in which the heat storage amount is recovered at the time of air conditioning.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 room 3 floor slab 8 ceiling space 11 air conditioner 11a air supply port 11b return air port 21 proximity duct (air flow path) 41 latent heat storage element

Continued on the front page (72) Inventor Toshiaki Matsuoka 4-33 Ikejiri, Itami-shi, Hyogo Mitsubishi Cable Industries, Ltd. Itami Works (72) Inventor Naoshi Fujita 4-640, Shimoseito, Kiyose-shi, Tokyo Obayashi Corporation Technical Research Institute

Claims (4)

[Claims] 1. When air conditioning for a room is stopped,
Air-conditioning air that absorbs heat from the air conditioner and is sent out from its air supply port is supplied to the floor slab via the air flow path and stores heat therein, while during indoor air conditioning, the heat stored in the floor slab is stored. A frame heat storage type air conditioning system that takes in the absorbed air-conditioning air from a return air port of the air conditioner and recovers the heat storage amount, and transfers the latent heat to the air flow path by heat exchange with the air-conditioning air. A heat storage type air-conditioning system combined with a heat storage device, wherein a latent heat storage body is provided. 2. The apparatus according to claim 1, wherein the latent heat storage element connected to the duct defining the air flow path is disposed in a space above the ceiling formed between the floor slab and the ceiling panel. Item 7. A heat storage type air conditioning system combined with a heat storage device according to Item 1. 3. The latent heat storage element is provided at an end of a duct near a floor slab, one of two air-conditioning air inlet / outlet openings of the latent heat storage element is connected to the end of the duct, and the other is air-conditioned air. The heat storage air conditioning system combined with a heat storage device according to claim 2, wherein the heat storage device is provided near the floor slab so as to flow along the lower surface of the floor slab. 4. A latent heat storage element includes a plurality of heat storage plates each formed by holding a latent heat storage material in a flat plate shape with a smooth surface in a pipe through which an end is communicated with a duct and air-conditioned air flows. The heat storage device according to any one of claims 2 to 3, wherein the heat storage device is arranged to face each other with a predetermined gap therebetween and to form a passage for the conditioned air between the heat storage plates along the pipe length direction. Combined skeleton thermal storage air conditioning system.