JP2000274710A - Structure of heat accumulation floor heater and method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a floor heating method utilizing night power by combining a floor set panel unit with the integration of a latent heat accumulation body and a planar electric heating resistor and sensible heat of a concrete heat accumulation layer. SOLUTION: A panel unit has a hydrate based latent heat accumulation body which has a proper melting temperature for floor heating and a large amount of latent heat at a melting point with excellent thermal histeresis for a long time in terms of the quantity of heat per unit heat accumulation material of 50 Kcal-62 Kcal/Kg and the unit heat capacity of 75 Kcal or more and a planar electric resistance heating body 2 of a heater using a heating method necessary for the melting of the accumulation body as an electric member attached within a range from the maximum height of 200 mm to the minimum height of 12 mm of a wood box-shaped exterior case, which is laminated on the heat accumulation body flush vertically therebetween. The panel unit is combined with sensible heat of the ground concrete and a mortar heat accumulation layer. The result is a smaller size, a thin designing and a handy installation with higher heat accumulating/radiating property.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floor heating apparatus for easily installing a heat storage body having a large calorific value on a concrete heat storage floor, and uses a latent heat storage and a sensible heat storage to generate electricity mainly at night. The present invention relates to the provision of a structure and a construction method of a heat storage type floor heating device that stores heat in the daytime and heats by heat radiation from a built-in heat storage material in the daytime.

[0002]

2. Description of the Related Art A method of storing heat using inexpensive nighttime electric power and heating the floor by radiating heat from a heat storage body in the daytime is a resource saving method.
Low cost and economical. Conventionally, if the floor heating is performed for 24 hours, the economic burden increases. As a method of using inexpensive nighttime electric power, a heat storage method for compensating for a time lag has been implemented. The conventional heat storage type has a small amount of heat, so the heat storage material has a small amount of heat. I was In general, the heat loss coefficient of a building is a Q value Kcal / m ² . h is standardized by Heating / cooling uses this reference value as a guide to the required amount of heat. The heat capacity per required unit that the floor heating device is allowed as a heat storage condition effective for heating is 75 per unit capacity.
A heat storage element capable of storing / dissipating heat of Kcal / l or more was required.

[0003] Conventionally, floor heating using nighttime power has been installed by laying a heat insulating material, a heater, and a heat storage body in a mortar on a slab by using a method of laying it in advance on a floor structure, and using it together with concrete sensible heat. It has been known. Due to the low heat storage capacity of the heat storage material to be buried according to the method being practiced, a method of increasing the amount of latent heat storage material or increasing the amount of latent heat storage material or sensible heat capacity of concrete has been adopted in order to supplement the required amount of heat. However, when the mass of the latent heat storage material buried in the unit volume and unit area is increased, the heat transfer performance is reduced and the cost is restricted. Also, if the securing of concrete volume was damaged,
Insufficient amount of heat was caused, causing a heat out phenomenon.
In addition, since floor heating laying is involved in the body structure construction, the divisions and responsibilities in the construction are complicated, and repair and correction inspection after burial,
In addition, it was difficult to remove, and the economic burden such as maintenance was large.

Among various types of floor heating, a latent heat storage material used for a heat storage body is known to be an inorganic hydrate or an organic material. As the sensible heat storage material, there is an inorganic material. Inorganic hydrates include, in addition to the sodium acetate and sodium thiosulfate systems used in the present invention, sodium sulfate systems and organic paraffins. Sodium sulfate heat storage material has a melting point / freezing point of 30 ℃
Before and after, the heat quantity per unit weight is 34 Kcal / Kg, the heat quantity per unit capacity is 49.3 Kcal / l, and the specific gravity is 1.45. Paraffin heat storage material has a unit calorie of 45 Kcal / K
g, heat storage amount per unit capacity: 40 kcal / l, specific gravity: 0.88. The specific gravity of hot water is 1.0Kca in the sensible heat storage system.
l / l. Specific heat is 1 Kcal / Kg ° C, concrete and mortar specific heat is 0.2 Kcal / Kg ° C, and specific gravity is 2.0. In order to use nighttime electric power, the heat storage body is required to have a capability of satisfying a required heat storage capacity. Floor heating limited to mortar sensible heat without burying latent heat storage elements would be too heavy to use nighttime power, and nighttime power would be disadvantageous if the capacity was small. In addition, supplementing with the heat storage method of concrete alone has been subject to restrictions that affect the structural strength and economics of the building due to the increase in weight. The following table shows a comparison between the performance of the heat storage material and each of the known heat storage materials.

[0005]

[Table 1] Table 1 compares the calorific value of the sodium acetate-based heat storage material. It is 1.8 times or more in volume ratio compared to the outside heat storage material. As indicated by the calories in the table, it is applicable for use with a limited bed volume. In a heat storage floor heating panel unit with a limited floor height, the allowable thickness of the heat storage material to be installed is limited to a range of 16 mm or less, and the required heat storage volume at this time is 16 / l per 1 m ² , which is suitable for buildings. Unit load 40 Kcal / m ^{2 based on} floor area. h, heat dissipation time 1
The required heat storage for 6 hours is 640 Kcal / m ² . From the numerical values shown in Table 1 above, the heat storage material employed in the present invention is 1 m
^{2 is 10.6 / Kg. As described above,} the heat storage capacity per ^{1 m 2} may be 7.2 / l or more, and the required capacity is 1
It is in the range of 6 l. Heat storage capacity of the heat storage weight 18.2 / Kg, 1m ² per per 1 m ² of sodium sulfate system 1
If it is required to be 3.1 / l or more, shortage of heat storage per unit occurs. Similarly, in the paraffin shown in the table, the heat storage amount per unit weight is 45 Kcal / Kg, and the heat storage amount per unit capacity is 37 Kcal / Kg.
In kcal, 1 m ² per desired heat storage material weight 14.2
When the heat storage material capacity per kg and 1 m ² is 17.3 / l, the specific gravity is small, so that it is impossible to secure a limited range of volume, and the required heat quantity is insufficient. The actual rate of use of the heat storage material occupying the floor heating area is a value reduced by about 20% due to the joist of the panel and the electrical connection mounting portion. As described above, both the paraffin-based heat storage material and the sodium sulfate-based heat storage material cannot secure a heat storage function that satisfies the amount of heat applied to the allowable volume of floor heating.

[0006]

SUMMARY OF THE INVENTION The present invention resides in a combination of a thermal storage concrete floor structure and a floor heating and thermal storage panel which can be used with any floor structure by using nighttime electric power. Conventionally, the floor structure is within the allowable range of the floor from the livability and structural strength of the indoor space and the related economic cost, in this case, the thickness,
Limited weight. It is an object of the present invention to provide a floor heater that has a small device height, stores heat with nighttime power by securing a heat storage amount that satisfies a required heat amount, and can satisfy the temperature and time required for heat storage / radiation. As a method, a heat storage material that satisfies the required amount of heat per unit required for heating within a volume restricted by the method, a panel device with an electric resistance heating element that efficiently converts electric energy into heat, and a good heat transfer concrete heat storage layer Heat storage floor heating combining an auxiliary heat storage unit is effective. A flat box-shaped electric resistance heating element with good heat dissipation efficiency and a thickness of 1 mm or less is layered tightly on a heat storage element mainly composed of sodium acetate hydrate as the latent heat storage material of the panel part, and the integrated state is a thin box shape In this method, heat is stored in the upper heat storage body and the lower heat storage layer concrete by a heater in the heat storage panel by using nighttime electric power in the wiring part of the connection to the case. In the daytime, the floor heating is covered by heat radiation from the heat storage unit, and continuous heating for 24 hours is possible while reducing power consumption. It should be noted that the simple construction and handling are to provide a resource-saving energy storage / floor heating device which can reduce the cost of the conventional method and use nighttime power.

[0007]

Means for Solving the Problems The present invention resides in a method in which the latent heat storage material used as a means is a combination of an electrolyte heat storage material mainly containing sodium acetate hydrate and a concrete or mortar sensible heat storage layer. As a method of using the heat storage material together, a method of burying a heat storage material is already known. However, the method of separately using the latent heat storage unit and the sensible heat storage unit and
The known construction method is effective and effective in eliminating troubles, such as increasing the amount of stored heat, simplifying maintenance work after the fact and simplifying the construction. The latent heat storage material used as the main heat storage layer employed in the present invention has a heat quantity per unit weight of 60 Kcal / Kg and a heat capacity per unit of 85 Kc.
al / l, specific gravity 1.42, melting point and freezing point 5
It is at 8 ° C. and has a specificity that the melting point / freezing point can be changed arbitrarily from 55 ° C. to 30 ° C. without reducing the amount of heat depending on the purpose of use. Since it can be made thin and compact, it can be laid within the allowable range of the floor height, which is the purpose of use, and the volume of the sensible heat storage layer can be constructed as required. Due to the synergistic effect of the good thermal conductivity of the concrete heat storage layer on the floor, heat is additionally stored outside the panel installation area. In the case of construction problems discovered after burial work, which is the biggest disadvantage of the conventional method of burying in concrete, measures to repair equipment buried in concrete, such as breaking the concrete floor, have been taken. In the method of the present invention, the problem can be solved by simply replacing the panel with a simple one.
Due to the construction separation, the required heat quantity and structural strength can be easily calculated in advance, and no special skills are required. Therefore, the work of increasing or decreasing the sensible heat storage volume is simplified, and the required amount of heat storage can be more accurately secured, so that the construction cost can be reduced.
In terms of function, the rise in floor temperature and the amount of heat storage are large compared to conventional burial, and the duration of heat radiation can be greatly improved. Efficiency and simplification of the construction method reduced the cost of construction and maintenance maintenance and installation that could not be solved by the burial method.
It is easy to remove, does not require skilled expertise, and can significantly improve reliability and economy. While storing heat using nighttime power to reduce daytime power consumption, 2
Running costs can be reduced by enabling continuous heating for 4 hours. It is a heat storage electric floor heating device that is small and thin and has a large heat storage amount.

[0008] A sodium acetate-based latent heat storage material having a heat storage performance effective for the present invention is filled and sealed in a blown container formed by molding a high-molecular resin such as polypropylene, polyethylene, or polyester into a flat plate or a thin film formed by laminating olefin and aluminum. Heat storage material,
It is preferable for the heat radiation effect and the stability of the heat history.

According to the present invention, the electric resistance heating element is preferably a planar electric resistance heating element in terms of heat conversion efficiency, heat dissipation, and adhesion to the heat storage element.

[0010] The material used for the exterior of the panel for incorporating the heat storage and the heater is a small joist made of a wooden frame box, and one side can be set in a range from a maximum height of 22 mm to a minimum height of 12 mm. , The surface length is an arbitrary dimension. The interval between the sides symmetrical to the surface length of the small joist is the building standard setting width, and the bottom plate at the bottom of the small joist is fixed to the small joist material by bonding a thermally conductive body (eg, aluminum or iron plate) with electrical insulation. Heated by the heater in the above configuration, it is conducted to the concrete thermal storage layer through the bottom plate and stores heat.

[0011] The size and capacity of the heat storage device installed in the exterior panel can be arbitrarily selected in proportion to the volume and area of the exterior panel. The criteria for selecting the capacity size of the heat storage body include, for example, the heat transfer coefficient, heat transmission coefficient, and heat loss coefficient Q value / m ² . h. Based on the floor m
The standard of the required heat per ² is required as a measure of the effect. Since the required heat storage amount per unit area is determined by the volume of the exterior panel and the laying area, the volume shown in the present invention is selected and configured for such a reason.

Conventionally, the electric resistance heating element used for concrete heat storage has been mainly constructed by interdigitating a wire-shaped electric resistance heating element in an interdigital shape and burying the heat storage element by a construction method. The diameter wire has a thick covering portion to prevent breakage at the time of embedding, and the heat dissipation and thermal conductivity required for unit density are not efficient. The heater employed in the present invention is planar and thin, and is excellent in heat conversion rate and transmission. Since the sheet-like electric resistance heating element is made to have a size that can be accommodated in the panel, there is no fear of breakage. Anything that has the heating capacity (unit W density) necessary to store the heat in the concrete capacity of the heat storage layer and the phase change of the heat storage body in the atmosphere by overlapping the heat storage body may be used. Has been added.

As an additional function, the panel unit of the present invention is operated mainly by a timer for utilizing nighttime power. In the case of nighttime power, input power is supplied within a limited time, and power supply in other time zones is interrupted by a timer. Heating during the shut-off period is covered by heat radiation from the heat storage unit. In general, the installed timer is generally used for night power only for 8 hours from 11:00 at night to 7:00 in the morning, and the timer is used from 7:00 to 11:00 at night. Are set to shut off electricity.
Since the latent heat storage method of the present invention requires that the latent heat storage material be heated to the melting point and melted within the energized time,
The function of the W density and the resistance value of the sheet-like electric resistance heating element influences. The heating element used in the present invention has a W density of 200 W to 4 W.
00W / m ² . time. Within the allowable range. Below this, the required capacity is low, the amount of heat required for melting cannot be obtained, and the function of heat storage cannot be achieved. On the other hand, if the W density is higher than that, the economy is impaired.

The latent heat storage material employed in the present invention does not require variable temperature control, unlike conventional simple sensible heat storage.
The heat storage body used for the panel is solid at a temperature lower than the intrinsic melting point. When this is heated, it changes into a liquid phase while absorbing heat, is completely liquefied, and the heat storage is completed. Generally, the latent heat storage material utilizes heat that flows in and out of melting / solidification, so that the purpose of utilizing latent heat is impaired at an unmelted temperature. It is necessary to employ a thermostat or PTC function set and adjusted based on the melting / freezing point temperature of the adopted heat storage material, and to heat the heat storage material at a specified temperature until the heat storage material is melted. The power is turned on and off by the function and the power timer switch, which has the function of turning on and off the power by detecting the melting / freezing point within the power limit time at night.
The power supply device is free maintenance and is excellent in safety and economy only by turning on the power supply during the floor heating period.

A thermostat that synchronizes with the heat quantity of the regenerator used in advance and the temperature of melting / solidification, or a sensor or thermistor connected to a relay switch that defines a similar temperature range is installed or connected to the regenerator, or The planar electric resistance heating element which functions by self-controlling the current from the power supply at the temperature determined at the melting point of the above is preferable.

The mortar and concrete heat storage layer utilizing sensible heat are heated / dissipated by heat conduction heat transfer (2.0 k × 10 ³ ). As a method for improving the heat transfer efficiency, graphite and carbon (8.4 to 37.7 k × 10 ³ ) powder are selected from graphite and carbons having excellent heat conductivity in the mortar. The range of the addition amount is 0.01 to 5% per mortar volume, preferably 1%. This is superimposed on a concrete layer and is generally used for reinforcement and heat transfer promotion in the middle of concrete and mortar.
By embedding a metal mesh over the layers, the effect of heat conduction can be enhanced.

[0017]

(Embodiment of the Invention) That is, the latent heat storage material used in the floor heating panel unit of the present invention has a melting point / phase change of at least 40% or more per unit capacity as compared with other heat storage materials. Since the freezing point can be raised by 10 ° C. or more, the apparatus is optimally used for floor heating installed on two or more floors particularly in a concrete building having a limited floor height. Mortar and concrete used for the heat storage layer only need to be provided with a mixture of mortar and good heat conductive material as a means to increase the heat conduction efficiency at the stage of foundation floor construction.
Thermal efficiency can be increased by 15% or more. According to the present invention, the allowable panel height is in the range of 22 mm to 12 mm based on the required calorific value calculation of the structure. This is a small and thin floor heating panel that can be used at night for electricity. The width and the surface length are dimensions according to the standard dimensions of the architectural design, and the inner height of the box frame at this time is in the range of 21 mm to 11 mm. In addition, the thickness of the latent heat storage element under the above conditions is in the range of a maximum height of 20 mm to 10 mm, and the width and the length of the surface length are arbitrarily created. is there. Furthermore, a latent heat storage floor heating panel in which a heat storage body is integrated with an electric sheet resistance heating element having a maximum height of 1 mm, a width and a surface length of an arbitrary layer and integrated with ancillary components and installed in the panel. It is. The laying method is such that the panels are fixed to the thermal storage layer concrete floor directly using anchor bolts, and the electric wiring between the panels is connected by an attached connector. The floor finish is a heat storage floor heating device in which a flooring material or a base plywood is fixed to a joist at both upper ends of a heat storage panel with a wood screw or an adhesive, finished with a carpet or vinylite, and connected to a power source. Since it can be separated into the concrete floor process and the interior work, it can be easily installed in carpentry work, shortening the work period, clarifying the work plan and the responsibility of work.

[0018]

Embodiment 1 An embodiment of a latent heat storage material employed in the present invention.

[Table 2] The selected sodium acetate-based heat storage material whose melting point was adjusted to 40 ° C. was treated with an olefin container tare weight of 514 g,
To convert to a specific heat of 0.35 [Kcal / Kg / ° C], the weight of the heat storage material shown in Table 2 was hermetically sealed, and the heat storage was heated in a constant temperature room using the sheet heating element. The heat storage amount / heat release amount of the item is a value measured by a heat flow meter. The results were almost consistent with the DSC measurement method. A unit heat storage amount appropriate for use as a heat storage material for heat storage floor heating. In addition, the W density of the heater used for the implementation was 250 W /
m ² . The time required for each of the five heat accumulators to melt in an atmosphere at room temperature of 19 ° C. was 3 hours and 50 minutes on average, which was an effective heater capacity range that could be used within the nighttime power use time zone. In addition, the additional function installed in the heat storage body exhibited an appropriate heat storage efficiency and effect using nighttime electric power.

[0019]

Embodiment 2 A latent heat storage element prepared to have a melting point of 40 ° C. based on Embodiment 1 was converted into an actual value dimension / width 250 mm × length 530 mm ×
10mm weight 1.25Kg, latent heat quantity 75Kcal /
The W density of the sheet-like electric resistance heating element is 250 w / m ^2.
h. A mortar heat storage layer that becomes a heat conductive good body with the same area as a panel integrated by layering h.
mm × 80mm weight 28.8Kg / sheet, specific heat 58Kc
al / sheets were directly laminated, a timer was set on the sample, and the sample was connected to a power supply. Operates in an environment with a room temperature of 15 to 18 ° C, and uses a data collector that can simultaneously measure and record 12 points of temperature for heat storage / radiation capacity and effect, sustainability, and thermal cycle behavior. The temperature change of the heat storage / radiation state was measured for the heat storage body surface, the heater surface, the mortar heat storage layer under the panel, the heat insulating material, the room, and the outside air. In the examples, the time required for heat storage was 7 hours and 15 minutes on average. The phase-changed melting temperature of the reached latent heat storage medium was 48 ° C., and the internal heat storage material was completely liquefied. The maximum temperature of the sensible heat storage section was 43 ° C. After the power was turned off, the panel radiated heat from 48 ° C. and continued to release latent heat from 40 ° C. at the freezing point, and the time required for radiating heat to 30 ° C. was 14 hours and 30 minutes. At this time, the heat radiation temperature of the floor surface changed in the range of 35 ° C. to 26 ° C., and the heat storage layer of the mortar showed the auxiliary effect of heat storage. The sample used for the operation was operated repeatedly and continuously, but there was no change in the thermal hysteresis behavior, and a stable heat radiation temperature range was maintained.

[0020]

Comparative Example 3 With the mortar heat storage layer removed, based on the same criteria as in Example 2, the latent heat storage element was replaced with an actual value dimension / width 250 mm × length 530 mm × 10 mm, heater 2
A sample having a panel structure in which 50 w / m ² · h were layered and integrated was connected to a power supply and a timer was set, and the heat storage / radiation function was measured. Measurement conditions are room temperature 15-18 ° C
Operates in a controlled environment, and measures and records heat storage / dissipation capacity and effect, sustainability, and thermal cycle behavior at 12 points at the same time. Using a data collector, the floor of the flooring and the surface of the latent heat storage material can be recorded. , Heater surface, under panel,
The temperature change of the heat storage / radiation state was measured for the room and outside air under the heat insulating material. In Examples, the time required for heat storage was 4 hours and 40 minutes on average. The phase-changed melting temperature of the reached latent heat storage medium was 48 ° C., and the internal heat storage material was completely liquefied. After the power is turned off, the panel becomes 4
Dissipates heat from 8 ° C and continues releasing latent heat from 40 ° C at the freezing point,
The heat radiation time to reach 30 ° C. was 9 hours and 30 minutes. At this time, the heat radiation temperature of the floor surface changed in the range of 35 ° C to 26 ° C.

[0021]

The floor heating method according to the present invention comprises a panel unit and a mortar and a concrete heat storage layer serving as a heat conductive body. As shown in FIG. 4, panel units are laid in parallel on the concrete heat storage layer. It can be adopted as a 24-hour floor heating device using inexpensive nighttime power. The heated concrete heat storage layer stores heat in the entire underlying heat storage layer by conduction heat transfer, and after the power is cut off, reversibly radiates heat from the heat storage layer to the floor surface by conduction heat transfer, thereby radiating heat and keeping the heat throughout the floor. As described above, not only the resource saving of heat, the economical efficiency of the initial and the running cost, but also the heat radiation temperature aptitude as the floor heating and the workability are combined. In addition, the heat storage method of the present invention has a feature of heat conduction, and does not require the heat resistance conventionally used in electric or hot water floor heating, so that it adds an advanced cost in terms of selectivity of materials used and economic efficiency. Things.

[Explanation of Signs]-Latent heat storage element-12-0 slab (foundation concrete)-Planar electric heating resistor-13-Panel unit-Thermostat-14-Sensor-Jota-15-Control equipment-Bottom plate (Heat Conductive plate> ▲ 16 ▼-Timer-Finishing material-17 ▼-Power supply-Wiring part (lead wire)-Electrical connection part (connector and terminal)-Metal mesh-10)-Concrete heat storage layer-11)-Heat insulation layer

[Brief description of the drawings]

FIG. 1 is a sectional view of a floor heating construction section showing a structure of a heat storage floor heating panel unit and a concrete heat storage layer. {Circle around (12)} There is a heat insulation layer on the slab, {10} a wire mesh is embedded, and {10} on the heat storage layer to be mortar and concrete, the joists are adhesively fixed along both ends of the iron plate at the bottom of the panel.
A heat storage element and a sheet-like electric resistance heating element are mounted in the same upper and lower layers between b. Sectional drawing in which a temperature controller necessary for operation by electricity and a device attached with a lead wire connected to a power supply (13) are installed in a panel frame which is formed into a box by connecting joists to both ends of the bottom plate and front and rear.

FIG. 2 is a plan view and a side sectional view of a blow container that becomes a polyolefin filled with a heat storage body adjusted to a melting point of 43 ° C. Is a thermostat for sensing the heat storage temperature and a sensor mounting portion.

FIG. 3 is a plan view and a side sectional view of an outer frame panel shape. A temperature-sensitive thermostat or a sheet-like electric resistance heating element equipped with a sensor is layered integrally with the heat storage element to become the bottom plate and joists a-b. (13) Installed in an outer frame panel and wired through a connector. (13) A wooden flooring material covers the upper part of the joists of the outer frame panels a and b to form a floor heating device.

FIG. 4 is an overall layout diagram showing a state where the (13) panels are laid in parallel. Between panels in parallel ((13) a
(13) d) is connected in parallel with connection terminals or connectors attached to each other, (16) time switch and (17)
▼ Connected to the power supply and laid. It is a figure example of the (13) thermal storage floor heating panel unit generally used of this invention. ▲ 1
5) The control panel is an arrangement diagram when the sheet-like electric resistance heating element uses self-temperature control of PTC. Control the increase of the initial rush power and detect the specified temperature of the heat storage element.
(15) A controller having a function of changing or interrupting a current value by a sensor is installed. In this case, a thermostat becomes unnecessary.

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Claims (3)

[Claims] 1. A heat storage device having a latent heat storage function in which a necessary power supply member is connected and integrated on a heat storage floor which has been previously prepared by mixing or installing a good heat conducting body in concrete or mortar in consideration of a floor structure. The present invention relates to a structure and a method of a floor heating device utilizing latent heat and sensible heat in a method of directly laying a floor type panel unit device or a latent heat storage element and a heater using a joist. 2. A heat storage material used for a panel unit is a latent heat storage material, and a melting point / solidification point at which a phase change occurs is 30 ° C. or more.
0 ° C or less, and the calorific value per unit weight of the heat storage material is 5
The heat quantity per unit capacity is in the range of 0 Kcal / Kg to 65 Kcal / Kg or 70 Kcal / l to 90 K
A latent heat type heat storage material having a range of up to cal / l is formed of a hydrate as a main material and filled in a sealed container. The floor heating system according to claim 1, wherein the heating unit and the heat storage unit are vertically and intimately layered in close contact with each other, mounted in a wooden frame, and provided with a connector and a temperature sensing member for connecting to a power supply. About the method. 3. A good heat conductor used for concrete and mortar used for a heat storage layer of a floor structure is processed into a metal powder such as carbon, graphite, aluminum and copper, or a fiber or chip made of the same material. The present invention relates to a structure and a method of a floor heating apparatus according to claim 1, which is a heat storage layer for heating a concrete foundation, which is formed by combining a net-like net which becomes a metal.