JPH09250130A - Hollow pile for heat-accumulation and air-conditioning system by use thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure a heat-accumulation tank, by providing a pipe opened against the bottom of a body and inserted from the upper part of the body into the inside of the hollow pile body, and providing an opening to connect to a pipe for an air-conditioning system, at the upper part of the body. SOLUTION: When the cooling operation is driven during the day time in the summer, the cold water 12 of a low temperature heat-accumulation medium is led from the opened lower end into a pipe 4 at the bottom of a hollow pile body 1 and moved up and conducted into an indoor device 13. The cold water 12 is supplied for cooling and changed to hot water 11 of a high temperature heat-accumulation medium and returned to the upper part of body 1 through a pipe connecting to the opening 5 of the body 1. When the cool-accumulation operation is driven during the night time in the summer, hot water 11 is transferred from the opening 5 to an outdoor device 14 and the heat of hot water 11 is removed and turned to cold water 12 and returned to the lower part of body 1 through the pipe 4. During the day time in the winter, the hot water 11 is transferred to the indoor device 13 for heating the indoor side and turned to the cold water 12 and returned to the tower part of the body 1 through the pipe 4 and during the night time of the winter, the cold water 12 is transferred to the outdoor device 14 through the pipe 14 to absorb heat and turned to hot water and returned to the upper part of the body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat storage system that utilizes cheap surplus electricity at night in an air conditioning system for daytime use such as an office building for cooling in the summer and heating in the winter by a heat pump method utilizing electricity. The present invention relates to a heat storage hollow pile that stores a heat storage medium of a so-called heat storage type air-conditioning system that stores required cold heat or warm heat in a medium and uses it during the daytime to reduce power load during the daytime, and an air conditioning system using the same.

[0002]

2. Description of the Related Art Since the temperature of the atmosphere that is the exhaust heat source during cooling is high in the summer, and the temperature of the atmosphere that is the heat absorbing source during heating is low in the winter,
The required power load becomes large.

In particular, the demand for electric power reaches a peak during the high temperature during the daytime in summer, and the facility cost of the power generation equipment of the electric power company becomes enormous in order to meet the demand, and fossil fuel is used for the peak power demand during the daytime. The operating rate of the power plant will be large, which is not preferable for global environmental conservation. Electric power companies are promoting the leveling of electric power for day and night by means of so-called pumped storage power plants, but it is far from a sufficient area due to location restrictions. As one of the measures for leveling power for day and night, by using surplus power at night, a cold heat source for cold water or ice is created in summer, and a high heat source for hot water is created in winter. A heat storage type air conditioning system that is used as a heat absorption source has been developed and is being used. Compared with a normal air conditioning system, the heat storage type air conditioning system
Since a considerable amount of heat medium such as water is used, extra equipment such as a piping system and a heat storage tank as a storage tank is required. In particular, it is often difficult to secure a facility for a heat storage tank, which has a fairly large volume, in middle and small buildings in the city. In many cases,
It is installed on the roof or underground of the building, but in any case, there are still issues to be solved such as the cost and location of the housing equipment as a heat storage tank.

[0004]

Means for Solving the Problems The present inventor has conceived to make use of this by focusing on the hollow portion of a hollow pile of a foundation pile that is usually installed underground in a building or the like.

In the hollow pile for heat storage, the pipe is inserted into the hollow pile main body whose both ends are closed and the pipe is open near the lower end to the bottom of the hollow pile main body, and the upper end is inserted through the upper portion of the hollow pile main body. An opening is provided in the upper part of the hollow pile body for connecting to the communication pipe of the air conditioning system.

A sliding partition plate may be slidably mounted on the heat storage hollow pile along the outer circumference of the pipe and the inner circumference of the hollow pile main body so as to be movable up and down.

In the air conditioning system, the heat storage hollow pile is connected to the heat storage medium system such as the outdoor unit and the indoor unit of the air conditioning system by the required pipes connecting to the upper end of the pipe and the opening of the hollow pile body. Structure

In the heat storage hollow pile, the pipe is inserted into the hollow pile main body whose both ends are closed, the pipe being open near the lower end to the bottom of the hollow pile main body, and the upper end being inserted through the upper portion of the hollow pile main body. The opening and the bottom of the hollow pile body are connected to the connection pipe of the air-conditioning system. Then, the structure may be provided so as to be introduced into and extracted from the hollow pile main body.

In the air conditioning system, required pipes for communicating with an outdoor unit and an indoor unit of the air conditioning system are inserted into the hollow pile main body through the upper part of the hollow pile main body and led out, and when the cold storage is carried out, The structure shall be such that it is connected to the brine heat sink and radiator to be iced.

Particularly, in the case of a steel pipe pile, it is necessary that the pile itself is heat-insulated.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Referring to FIG. 1, which is a longitudinal sectional view schematically showing an embodiment of the invention of claim 1, a hollow pile main body 1 is a so-called hollow concrete pile or steel pipe pile using reinforcing bars, steel rods and concrete. The inside of the pile is hollow, and its upper and lower ends are closed by the upper end plate 2 and the lower end plate 3 to form a hollow pile main body as a whole. Closing by the upper end plate 2 and the lower end plate 3 may be performed by known appropriate means such as screw fastening or welding, and if necessary, leakage preventing means such as a gasket may be used together. Further, depending on how the hollow pile is installed on the ground, the lower end of the hollow pile main body 1 may be closed by means such as so-called consolidation or hardening bulb (in this case, the lower end plate 3 becomes unnecessary). The upper end plate 2 is provided with an opening 5 for connecting to a communication pipe to the main equipment of the air conditioning system. The tip of the opening 5 is configured in a form suitable for a fastening connection such as a flange, a gasket, and a screw, a direct connection by welding, and the like. Of course, in the storage / transportation of the hollow piles, it is a matter of course that temporary treatment such as temporarily attaching a blind lid to prevent dust and the like from entering the inside should be performed.

Since hot water flows out through the opening 5 in the operation shown in FIGS. 4 (b) and 4 (c) described later, the short pipe hangs downward from the opening 5 depending on the actual condition of the apparatus. On the other hand, even if some air remains in the lower portion of the upper end plate 2, the warm water will flow out smoothly from the opening 5. These considerations are, of course, made in accordance with the normal method of piping equipment.

A pipe 4 having a thickness conforming to specifications such as a method and capacity of an air conditioning system utilizing the invention of claim 1 is inserted through an upper portion of the hollow pile main body 1, that is, an upper end plate 2 in this case, and a lower end thereof. The part is provided in an open state with respect to the bottom of the hollow pile main body 1, that is, in this case, in an open state slightly above the lower end plate 3. Alternatively, the pipe 4 having a notch on the side surface of the lower end may be brought into contact with the lower end plate 3. Supporting of the pipe 4 and sealing of the insertion portion are performed by a known appropriate means.

A pipe 4 made of a heat insulating material having a low thermal conductivity, or a metal pipe 4 covered with a heat insulating material,
The pipe 4 has a substantially heat insulating property, and preferably, the inside and outside of the pipe 4 are smooth, and the heat storage medium can move smoothly. The upper end of the pipe 4 is opened and connected to a connecting pipe to the main equipment of the air conditioning system. The shape of the upper end of the pipe 4 is the same as that of the opening 5.

In the invention of claim 1, when used, it is set in the ground like a normal so-called foundation pile and is used to support a load of a building or the like, and is connected with a required connecting pipe to store a heat storage medium. It serves as a heat storage tank. This will be described later.

In FIG. 2 which schematically shows the embodiment of the invention of claim 2 in a longitudinal section, the hollow pile body 1, the upper end plate 2, the lower end plate 3, the pipe 4 and the opening 5 are shown in FIG. It is the same as each of the embodiments of the invention of Item 1. In addition to these, in the case of FIG. 2, a sliding partition plate 6 and the like are provided. The sliding partition plate 6 has an outer circumference set to be slightly smaller than the inner circumference of the hollow pile 1 in order to slide and move up and down, and at a corresponding position of the pipe 4 to slide up and down and move up and down. A hole 7 slightly larger than the outer diameter of the pipe 4 is provided. In this case, a ring-shaped spacer 8 is inserted along the inner peripheral wall of the hollow pile main body 1 so that the sliding partition plate 6 does not fall off the pipe 4 at the lowermost end. There may be a limit to the watertightness of the sliding surface depending on the smoothness of the inner peripheral wall surface of the hollow pile body 1, but even if there is some leakage, the heat storage medium of high temperature / low temperature is substantially isolated. All you need to do is

In order to reliably distinguish the high temperature heat storage medium 11 and the low temperature heat storage medium 12, the apparent density of the entire sliding partition plate 6 should be set to be approximately the same as the heat storage medium used in the air conditioning system. Is preferred. For example, when the heat storage medium used is water, the apparent density of the sliding partition plate 6 is set to about 1 although there are some differences between the hot water, the cold water and the ice. When the sliding partition plate 6 is made of metal, it is sufficient that the apparent density becomes about 1 as a whole by providing an appropriate space therein. The sliding partition plate 6
In order to smoothly slide and move up and down in a stable posture, the sliding partition plate 6 should be formed such that the upper part is lighter (lower density) and the lower part is heavy (higher density) like a kite. Is preferred. Further, by providing a tubular body projecting vertically in the sliding portion between the pipe 4 and the hollow pile main body 1 and the sliding partition plate 6, the sliding vertical movement is further facilitated. In order to increase the thermal efficiency of the heat storage medium, it is preferable that the sliding partition plate 6 has a heat insulating property.
It does not matter if the sliding partition plate 6 itself is made of a material having a low thermal conductivity or the metal main material is covered with a heat insulating material, but the overall apparent density is set to be approximately the same as the density of the heat storage medium. Is preferred.

In FIG. 3 schematically showing the embodiment of the invention of claim 3 in a longitudinal section, the hollow pile 1, the upper end plate 2, the lower end plate 3, the pipe 4 and the opening 5 are shown in FIG. The same as each of the embodiments of the invention. In addition to them, in the case of FIG. 3, conduits 9A and 9B for connecting to a brine system such as an outdoor unit and an indoor unit are provided by being inserted into the hollow pile main body 1 through the upper end plate 2. ing. One extends in the direction of the bottom of the hollow pile body 1 and the other extends to the vicinity of the upper part, and a serpentine pipe, which is a brine absorber / radiator 10 for icing ice during cold storage, is provided between the two. In conformity with the specifications such as the method and capacity of the air-conditioning system in which the invention of claim 3 is used, the brine absorbing / radiating device 10 adopts an appropriate form such as a parallel straight pipe in addition to the flexible pipe.

In FIG. 4, which is a schematic piping system of an air-conditioning system showing an embodiment of the invention of claim 4, the heat storage hollow pile shown in FIG. 2, which is an embodiment of the invention of claim 2, is shown. However, what excludes the sliding partition plate 6 in FIG. 4 corresponds to the case where FIG. 1 is used as the hollow pile for heat storage. Here, both cases will be described together.

Various types of air conditioning systems are known,
Various types are put into practical use, and various types of systems that use a heat storage medium and a heat storage tank together are known. The present invention can be applied to various systems that use a heat storage medium together.
The basic configuration consists of an indoor heat exchanger, an outdoor heat exchanger, a fan that sends air to these, a hot and cold water system, a refrigerant pump and compressor, brine, a heat storage medium heat exchanger, a heat storage tank, and connecting piping. is there. In FIG. 4, for convenience of explanation,
Indoor unit 13 including brine and heat exchange of heat storage medium
The outdoor unit 14 and the hollow pile for heat storage are connected by piping.

In FIG. 4 (a), water is used as the heat storage medium, and cold water (and sherbet ice) as the low temperature heat storage medium 12 generated at night is stored in the hollow pile body 1 for heat storage. , The situation of cooling operation during the daytime in summer is shown. The low-temperature heat storage medium 12 is introduced into the pipe 4 from the open lower end of the pipe 4 at the bottom portion of the hollow pile 1, rises inside the pipe 4, and is guided to a required portion of the indoor unit 13. The cold heat of the low-temperature heat storage medium 12 is effectively used for cooling.

The power load of the air-conditioning system using the low-temperature heat storage medium 12 is smaller than the power load of the normal air-conditioning system that does not use the low-temperature heat-storage medium 12 to directly exhaust heat to the atmosphere. The high-temperature heat storage medium 11 that has been subjected to cooling and has risen in temperature to become warm water is returned to the upper part of the hollow pile main body 1 via the piping system that communicates with the opening 5 at the upper end of the hollow pile main body 1.

In order to increase the cold heat storage amount of the low temperature heat storage medium 12, an operating condition (the cold storage operation of FIG. 4 (b) described later) is adopted in which the low temperature heat storage medium 12 is a mixture of cold water and sherbet ice. In that case, since the hot water that is the high-temperature heat storage medium 11 is returned to the sherbet ice above the cold water of the low-temperature heat storage medium 12, the two circulate and convection due to the density of the two, and heat is exchanged between them. , The thermal efficiency of the air conditioning system decreases. When the heat storage hollow pile shown in FIG. 2 is used, the sliding partition plate 6 separates the two from each other, and thus such a decrease in thermal efficiency is prevented. In the case of operating conditions in which only cold water is used as the low temperature heat storage medium 12 without generating sherbet ice, the heat storage hollow pile (without sliding partition plate) of FIG. 1 is used.
But it doesn't matter. Generally, the hollow space of the hollow pile main body 1 has a high height with respect to the diameter, and natural convection hardly occurs.

At the end of the cooling operation at night, the inside of the heat storage hollow pile is filled with hot water, and when the sliding partition plate 6 is provided, it is located under the heat storage hollow pile. . (By the way, as a matter of course, since a large number of piles supporting a building are usually set, a required number of hollow piles for heat storage are used to accommodate a heat storage medium in an amount corresponding to the capacity of the air conditioning system. In order to use the heat storage medium in the heat storage hollow piles evenly and effectively, conventional means such as providing a required constant flow valve in these piping systems are taken). In Fig. 4 (b) showing a situation in which cold night electric power is used to perform cold storage operation in the summer night, hot water, which is a high-temperature heat storage medium in the hollow pile for heat storage, flows from the opening 5 at the upper end to the outdoor unit 14.
Sent to In the outdoor unit 14, the heat of the hot water is exhausted to the atmosphere, and the hot water is changed to cold water (and sherbet ice) as the low temperature heat storage medium 12. The low temperature heat storage medium 12 fills the heat storage hollow pile via the pipe 4. As mentioned above,
When the low temperature heat storage medium 12 contains sherbet ice, the high temperature heat storage medium 11 and the low temperature heat storage medium 1 are separated by the sliding partition plate 6.
It is preferable to isolate 2.

Contrary to the summer cooling operation described above, during the winter daytime,
As shown in FIG. 4C, the hot water as the high temperature heat storage medium 11 is sent to the indoor unit 13 for heating, and the cold water as the low temperature heat storage medium 12 whose temperature has been lowered is returned to the inside of the heat storage hollow pile through the pipe. As shown in FIG. 4D, cold water as the low temperature heat storage medium 12 passes through the pipe 4 and the outdoor unit 14 at night in winter.
The heat is absorbed from the atmosphere and the temperature is raised there to become hot water which is the high temperature heat storage medium 11 and is returned to the upper part of the heat storage hollow pile.

In FIG. 5, which is a schematic piping system of an air-conditioning system showing an embodiment of the invention of claim 5, the heat storage hollow pile shown in FIG. 3 is used. The configuration of the system other than the heat storage hollow pile in FIG. 3 is the same as that described above with reference to FIG. 4, but the difference is that the brine system is provided inside the heat storage hollow pile. Water is used as a heat storage medium, and a refrigerant compatible with this is used as brine.

In FIG. 5 (a) showing the cooling operation, the brine absorber / radiator 1 is cooled by the cold storage illustrated in FIG. 5 (b) described later.
A large amount of icing ice 15 is generated and attached around the outer surface of most of 0, and the water inside the hollow pile main body 1 is cold water which is the low temperature heat storage medium 12. The low-temperature heat storage medium 12 is introduced into the pipe 4 from the open lower end of the pipe 4 at the bottom portion of the hollow pile main body 1, rises inside the pipe 4, and is guided to a required portion of the indoor unit 13.
The cold heat of the low-temperature heat storage medium 12 is effectively used for cooling. The high-temperature heat storage medium 11 that has been heated to hot water by being cooled is
It is returned to the upper part of the hollow pile main body 1, cooled by the ice accretion 15, becomes the low temperature heat storage medium 12, and is again used for cooling. The icing ice 15 having a large latent heat is effective as a cold heat source. The power load is small as described above with reference to FIG.

The outdoor unit 14 is shown in FIG. 5 (b) showing a situation in which cold night electric power is used to perform cold storage operation at summer night.
The brine, which has undergone a required process such as compression and cooling, is guided from the conduit 9B to the brine heat absorber / radiator 10 to evaporate, and thus absorbs heat from the high temperature heat storage medium 11 which is warm water. When the heat absorption progresses, the low-temperature heat storage medium 12, which has become cold water, further cools and freezes around the outer surface of the brine heat sink / radiator 10 to grow as ice accretion 15. In other words, cold heat is stored in the form of ice with a large latent heat, which enhances the cooling effect.

Contrary to the above summer cooling operation, during the winter daytime,
As shown in FIG. 5C, hot water as the high temperature heat storage medium 11 is sent to the indoor unit 13 for heating, and cold water as the low temperature heat storage medium 12 whose temperature has been lowered is returned to the heat storage hollow pile through the pipe 4. At night in winter, as shown in FIG. 5 (d), the brine that has undergone a process such as heat absorption / compression in the outdoor unit 14 is guided to the brine heat radiator / radiator 10 from the conduit 9A and radiates heat to the surroundings, that is, cold water. The low temperature heat storage medium 12 is heated. The temperature of the cold water rises and becomes a high temperature heat storage medium which is hot water.

[0030]

EFFECTS OF THE INVENTION In air conditioning of an office building, increase in power consumption, especially concentration of daytime power consumption, caused by high temperature of exhaust heat source during cooling in summer and low temperature of heat absorbing source during heating in winter. In order to mitigate the
A heat storage type heating and cooling system that contributes to heating is performed. At this time, a large amount of heat storage medium having a large specific heat is indispensable, and a storage tank for it is required. According to the present invention,
Since the hollow space of the hollow pile buried in the foundation of the building is effectively used, it is not necessary to newly provide a storage tank for the heat medium.

Further, by providing a sliding partition plate inside the hollow pile, even if a high-temperature heat medium and a low-temperature heat medium coexist in a single heat medium storage tank, heat transfer due to convection does not occur and high temperature The inconvenience that the low temperature heat medium is mixed to lose the effect of cold storage and heat storage does not occur.

Further, since the brine absorbing / dissipating device is provided in the hollow pile which serves as a storage tank for the heat medium, an ice accretion effect is brought about on the outer surface of the brine absorbing / dissipating device and the cold storage effect can be enhanced.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an embodiment of the invention of claim 1.

FIG. 2 is a schematic cross-sectional view showing an embodiment of the invention of claim 2.

FIG. 3 is a schematic sectional view showing an embodiment of the invention of claim 3;

FIG. 4 is a schematic piping system diagram of an air-conditioning system showing an embodiment of the invention of claim 4. (A) is cooling operation, (b)
Is a schematic diagram showing a situation of a cold storage operation, (c) a heating operation, and (d) a temperature storage operation.

FIG. 5 is a schematic piping system diagram of an air conditioning system showing an embodiment of the invention of claim 5; (A) is cooling operation, (b)
Is a schematic diagram showing a situation of a cold storage operation, (c) a heating operation, and (d) a temperature storage operation.

[Explanation of symbols]

1 ... Hollow pile main body, 2 ... Upper end plate, 3 ... Lower end plate, 4 ... Pipe, 5 ... Opening, 6 ... Sliding partition plate, 7 ... Hole, 8 ... Spacer, 9A ... Conduit,
9B: conduit, 10: brine absorber / radiator, 11 ・
..High temperature heat storage medium, 12 ... Low temperature heat storage medium, 13 ...
・ Indoor unit, 14 ... Outdoor unit, 15 ... Ice accretion

Claims (5)

[Claims] 1. Inside the hollow pile main body whose both ends are closed,
The pipe is provided near the lower end to the bottom of the hollow pile main body, and the upper end is inserted through the upper part of the hollow pile main body, and the opening for connecting to the communication pipe of the air conditioning system is provided in the hollow pile main body. A hollow pile for heat storage, which is provided at the top. 2. The heat storage hollow pile according to claim 1, wherein the sliding partition plate slides along the outer circumference of the pipe and the inner circumference of the hollow pile main body, and is vertically movable. . 3. A brine absorbing / dissipating device for accumulating ice during cold storage is provided so as to be inserted into and discharged from the inside of the hollow pile main body by inserting it through the upper portion of the hollow pile main body. The hollow pile for heat storage according to 1. 4. The pipe for communicating with a heat storage medium system, such as an outdoor unit or an indoor unit of an air conditioning system, communicates with an upper end portion of the pipe and an opening of a hollow pile body. An air conditioning system using the hollow pile for heat storage according to 2. 5. A brine for introducing required pipes, which communicate with a brine system such as an outdoor unit and an indoor unit of an air conditioning system, into the hollow pile main body through the upper portion of the hollow pile main body so as to be iced during cold storage. The air conditioning system using the hollow pile for heat storage according to claim 3, wherein the air conditioning system is in contact with the heat sink and radiator.