JP2002310455A - Thermal storage structure of underfloor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly and smoothly form a thermal storage layer of an underfloor space of a house. SOLUTION: Fluid routes for passing a heating medium or a refrigerant are arranged in upper and lower layers, which can be switched and operated. This is similar in the case of utilizing an electric heater. A fluid route and an electric heater may be combined in upper and lower layers of two layers. A heating/cooling means may be sometimes arranged in a concrete foundation of a building together with such a thermal storage structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat storage structure under a floor of a house.

[0002]

2. Description of the Related Art Since the heating / cooling efficiency of a house depends on the hermeticity of the house itself, various design structures for highly airtight houses have recently been proposed. Under these structure proposals, heat storage under the floor has been proposed. Technology is gaining attention.

Paying attention to such a point, Japanese Patent Laid-Open No.
The invention described in Japanese Patent No. 2150 proposes a technique in which an electric heating means is arranged under the floor of a house, and heat is stored on a floor surface of the house to increase heating efficiency. Also, Japanese Patent Application No. Hei 11-06735
No. 0 discloses a structure in which a pipe capable of circulating a heat medium / refrigerant, which is a fluid, is disposed under the ground under the floor, and the space under the floor is heated / cooled. .

Specifically, as shown in FIG. 2, a plurality of heating means (hot water pipes and the like) 8 are arranged below the concrete foundation 2 of the house 1 and the soil heat storage layer is provided below the ground by the heating means 8. 4 is formed. If the effective depth (about 3 m) of the soil heat storage layer 4 is warmed to 15 to 20 ° C., heating in winter becomes almost unnecessary.

[0005]

However, in each of the above-mentioned conventional proposals, a heating means 8 for heating or cooling the underfloor space is arranged at a position at a certain depth below the floor base surface. Of course, even with such a structure, soil heat storage (heating or cooling) under the floor is possible, and there is no problem in principle. However, there is a problem that the heat storage efficiency of the floor base is very poor.

[0006] Once the floor surface (soil) is heated / cooled, there is an advantage that the subsequent heating / cooling operation can be reduced due to the low heat radiation (high heat storage maintenance). As described above, the temperature of the deepest part of the soil thermal storage layer 4 is 15
When the temperature becomes higher than or equal to ° C., it is possible to sufficiently maintain the heating of the house only by heating the soil at night using electric power at midnight. This is the same in cold regions such as Hokkaido.

There are two problems. First, it takes too much time to store heat on the floor surface to ensure a heating effect in winter. In the case of the conventional proposed technology, it is necessary to operate the heating means arranged on the floor substrate about three weeks before the outside air temperature at which room heating is required is assumed. This is because the heat storage of the floor base surface requires continuous heating due to the low thermal conductivity of the soil. The same is true for increasing the cooling efficiency.

The second problem is that it is necessary to perform underfloor heating (cooling) before the completion of a new house, and the installer needs to make an early request for service supply to an electric power company or a gas supply company. Occurred. In other words, the building builder required a complicated schedule adjustment for the underfloor heating and cooling system. However, the outside air temperature fluctuates rapidly in winter, and it is difficult to predict the operation start date in advance, and it is possible that the owner will be inconvenienced.

An object of the present invention is to make it possible to form a heat storage layer in a space under a house floor more quickly and smoothly.

[0010]

In order to achieve the above object, the underfloor heat storage structure according to the present invention firstly arranges a fluid path for passing a heat medium or a refrigerant in two layers, upper and lower, and performs a switching operation between upper and lower layers. It is possible (claim 1). The same applies when an electric heating element is used (claim 2). The fluid path and the electric heating element may be combined to form two layers, upper and lower (claim 3). Also,
In addition to such a heat storage structure, a heating / cooling means may be provided inside a concrete foundation of a building (claim 4).

[0011]

According to the present invention, the heating means (or / and cooling means; hereinafter simply referred to as "heating means") is disposed in two layers above and below the ground under the ground (claims 1 to 3), whereby the under-floor heat storage structure according to the present invention is provided. Then, smooth and efficient soil heat storage can be achieved.
The reason is as follows.

First, the provision of heating means in the upper and lower layers facilitates heating of a deeper layer. With the conventional single-layer structure in which the heating means is arranged at a uniform depth, it is not possible to obtain such an effect. Because the conventional single layer structure,
In cold regions such as Asahikawa, Furano and Nayoro, the construction area in the foundation was limited, and construction with a large heat capacity was difficult. Also, in order to increase the heat capacity, it is necessary to increase the construction depth, but this makes it difficult to control the temperature above the floor surface.

[0013] The second is the early formation of the soil thermal storage layer. This is the result of the heating means having a multi-layer structure. On the other hand, the structure according to the present invention facilitates the maintenance of the soil heat storage layer during the severe winter due to the effect of the heating means in the shallow part close to the surface layer. Conventionally, assuming that soil heat storage takes, for example, three weeks, the structure according to the present invention can form a soil heat storage layer in about one-third or less of the period, for example, about one week.

The cost required for the maintenance heating (cooling) after the formation of the soil heat storage layer is almost the same as that of the conventional structure. This is because it is sufficient to operate only the lower layer heating means.

In the structure according to the present invention, only the lower heating means can be operated, and the upper and lower layers can be operated at the same time. Various driving variations can be used according to changes in the outside temperature. For example, in the operation example in the case of forming a soil heat storage layer, first, only the heating means in the lower layer is operated from an early stage before the arrival of full-scale winter (even at midnight only), and the soil temperature is raised to a certain depth. For example, when the temperature suddenly becomes cold, that is, when it becomes necessary to heat the shallow soil portion, the upper-layer heating means is only activated. Also, even after the soil thermal storage layer has been formed once, as in the case where the days of sudden cooling continue,
When the freezing depth is deeper than expected, the maintenance of the assumed temperature of the soil thermal storage layer can be completely achieved by operating the upper and lower heating means for an appropriate period of time.

In view of the fact that it is difficult to keep the heat just below the openings (windows, doors, etc.) of the house, the heating means is arranged inside the concrete foundation. Ensures high temperature (winter) or low temperature (summer) under the floor (foundation space) affected by the soil thermal storage layer. Although the indoor cooling and heating efficiency can be significantly improved only by the function of the soil heat storage layer, the fluctuation of the underfloor temperature caused by the opening structure of the house can be minimized by the heating means arranged in the concrete foundation.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a view showing an embodiment of a heat storage structure under the floor according to the present invention, wherein 1 is a house, 2 is a concrete foundation, 3 is a floor slab, and 14 and 15 are upper and lower two layers. The pipe member 17 disposed is a soil heat storage layer formed by warm water or a refrigerant flowing through the pipe members 14 and 15. Reference numeral S1 denotes an upper layer heating unit constituted by the pipe member 14, and S2 denotes a lower layer heating unit constituted by the pipe member 15. Reference numeral 51 denotes a window, and 52 denotes a door, which indicates a vehicle body opening.

The upper layer pipe member 14 is, for example, a floor slab 3
It is desirable to provide it at a depth within 5 cm from immediately below the lower end of the. Further, it is desirable that the lower pipe material 15 is provided, for example, at a depth of 25 to 40 cm from immediately below the lower end of the floor slab 3. The arrangement depth of the upper layer pipe member 14 is indicated as D1, and the arrangement depth of the lower layer pipe member 15 is indicated as D2. D1 = 0-5
cm, D2 = 25-40 cm.

In addition to the hot water or steam heated by a boiler device (not shown), a refrigerant can flow through the pipe members 14 and 15 by an air conditioner. When cooling is not performed, that is, when the soil temperature is not forcibly reduced, electric heating means (a resistance heating wire, a high-electricity panel unit having a resistance heating wire, or the like) may be provided instead of the pipe member 14. .

The heating medium /
A pipe member 21 through which a refrigerant can flow is provided.
An electric heating wire may be used instead of the pipe member 21. This is because cooling efficiency cannot be increased, but at least heating efficiency can be guaranteed. The pipe member 21 (electric heating wire) is disposed in a portion of the concrete foundation 2 where installation work is easy. Usually, this is preferably arranged at the joint between the upper surface of the concrete foundation 2 and the floor slab 3.

According to this structure, the formation of the soil heat storage layer 17, that is, the heating up to a depth of 3 to 5 m below the floor (15 ° C. or more) is efficiently performed by the pipe members 14 and 15 arranged in the upper and lower layers. Thus, the soil heat storage layer 17 that satisfies a predetermined temperature condition can be formed in a short period of time. Therefore,
Even if the construction work is delayed or the supply of the heat source (power / gas) is delayed, the soil heat storage effect as designed can be provided within a short period of time. Similarly, if the owner (landowner) forgets the preliminary operation of the soil heat storage system from the following year, the same heating / cooling efficiency is obtained as quickly as possible.

After the soil heat storage layer 17 has been formed under the desired temperature conditions, in general, only the lower layer pipe member 15 needs to be used. This is because it is easy to maintain the temperature of the soil heat storage layer 17 by operating the lower pipe member 15.
However, when there is a concern about a temperature drop near the surface of the ground, such as when the outside air temperature becomes extremely severe, for example, the upper layer pipe member 14 is operated only at night (alone or in cooperation with the lower layer pipe member), It is desirable to maintain the temperature of the soil heat storage layer 17 properly.

On the other hand, the pipe material 21 disposed on the concrete foundation 2 directly heats (cools) a portion immediately below the opening of the vehicle body, such as a window 51 or a door 52, and, together with the soil heat storage layer 17, indoors. It maintains the cooling and heating efficiency. Since this pipe member 21 directly heats and cools the concrete foundation 2, the soil temperature under the floor slab 3 is immediately forcibly adjusted in the case of a sudden change in the outside air temperature, regardless of the temperature change of the soil heat storage layer 17. There are advantages that can be done. Although there is no continuous stability like the action performed by the soil heat storage layer 17, the soil heat storage layer 1 is not
7 or better.

The arrangement pattern of the pipe members (14, 15, 21) used in the heat storage structure according to the present invention is not particularly limited. It is desirable that the pipe material (14, 15) buried under the ground uses an arrangement pattern in a so-called road heating system. This is because the best balance between the flow path of the hot water and the temperature change is maintained. The same applies to heating wires buried underground. Further, it is desirable to appropriately design a portion of the concrete foundation 2 where the pipe material or the heating wire is disposed according to a window or a door (opening) that causes a temperature drop. Instead of being wrapped around the entire outer periphery, it may be arranged, for example, only under the opening or only at the partition base.

[0025]

As described above, according to the underfloor heat storage structure of the present invention, the heat storage layer in the underfloor space can be formed more quickly and smoothly.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of an underfloor heat storage structure according to the present invention.

FIG. 2 is a diagram illustrating a conventional underfloor heat storage structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 House 2 Concrete foundation 3 Floor slab 14, 15, 21 Pipe material 17 Soil heat storage layer 51 Window 52 Door

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2E001 DD17 EA01 FA21 FA22 GA08 GA65 GA77 HE09 HE10 3L071 CC01 CD02 CE01 CE05 CE07 CF01 CF05 CF14

Claims (4)

[Claims] 1. An underfloor heat storage structure in which a fluid path is provided under a floor of a building and a heat medium or a refrigerant is circulated through the fluid path, wherein the fluid path comprises: an upper layer path disposed at a shallow portion; An underfloor heat storage structure, comprising: a lower path disposed at a position deeper than the upper path, wherein a fluid circulation to the upper path and the lower path can be selected by switching a valve. 2. An underfloor heat storage structure in which an electric heating element is disposed under a floor of a building, wherein the electric heating element is disposed in an upper layer path arranged in a shallower part and in an area deeper than the upper layer path. An underfloor heat storage structure, comprising: a lower-layer path, wherein energization of the upper-layer path and the lower-layer path can be selected by a switch operation. 3. A heat storage structure under a floor, wherein a fluid path for circulating a heat medium or a refrigerant and an electric heating element are arranged in two layers above and below the floor of the building. 4. A heating / heating system in a concrete foundation of a building.
The underfloor heat storage structure according to claim 1, further comprising a cooling unit.