JP3055218B2 - Heat storage floor heating system - Google Patents

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 that uses heat generated by inexpensive but only intermittently provided energy such as midnight power and solar heat in a latent heat storage material.

[0002]

2. Description of the Related Art A floor heating apparatus utilizing radiant heat constitutes a comfortable heating system in order to heat a room evenly and to stimulate a warm point of a human body comfortably. In recent years, such a heating apparatus provided with a heat storage structure mainly for the purpose of energy saving has been used. That is, heat or solar heat generated using inexpensive midnight power, waste heat of another heat source, or the like is stored in a heat storage material, and the heat is used during heating.

As a heat storage material, a sensible heat storage material such as concrete or brick has been used. However, recently, a latent heat storage material having a larger heat storage amount per volume than these sensible heat storage materials and capable of storing and releasing heat at a constant temperature has been put to practical use. Latent heat storage materials are solid-liquid, solid-
It utilizes latent heat associated with a phase change between solids and the like. For example, sodium sulfate decahydrate (Na ₂ · SO ₄ · 10H
₂ O) and, paraffins, fatty esters, and the like are known.

[0004]

FIG. 5 shows an example of a floor heating device using a latent heat storage material which is put into practical use.
This device uses a midnight electric power to heat a heater to store heat in a heat storage body, and repeats a cycle of storing heat during the night and releasing heat during the day. The structure is such that a heat storage body 2 is provided below a floor finishing material 1, and a heater 3, a heat storage body 4, and a heat insulating material 5 for preventing heat radiation below the floor are provided therebelow. In this structure, since both surfaces of the heater 3 are in contact with the heat storage elements 2 and 4, the heat storage efficiency is better than when only one surface of the heater 3 is in contact with the heat storage element 2 (there is no heat storage element 4). It has a feature that heat can be uniformly stored in the entire heat storage bodies 2 and 4.

[0005]

However, this device has the following drawbacks because the heat accumulator 2 and the heat accumulator 4 have the same thermal conductivity.

The heat stored in the upper heat storage material 2 radiates heat relatively quickly, whereas the heat stored in the lower heat storage material 4 becomes difficult to radiate since the heater 3 has thermal resistance. . Therefore, there is a problem that the next heat storage is performed while the heat is not radiated much, and the ratio of the amount of heat radiated into the room to the input power is small.

[0007]

SUMMARY OF THE INVENTION The gist of the present invention is to provide a planar heat storage floor heating device including a heater and a latent heat storage material for storing heat from the heater, wherein the latent heat storage material layer 2 is provided. , 4 are formed on both sides of the heater 3 arranged in a plane, and the thermal conductivity of the latent heat storage material layer 4 on the lower surface side of the heater 3 is lower than that of the latent heat storage material layer 2 on the upper surface side of the heater 3. It is a thermal storage floor heating device characterized by being larger than the rate.

As a method for increasing the thermal conductivity of the latent heat storage material layer 4, for example, when a latent heat storage material composed of an ethylene-α-olefin copolymer and paraffin is used, aluminum hydroxide, aluminum flake, etc. A substance having a relatively high thermal conductivity and the above two components are ethylene-α
There is a method of mixing at a temperature not lower than the melting point of the olefin copolymer and not higher than the thermal decomposition temperature. FIG. 2 shows the results obtained by measuring the increase in the thermal conductivity of the latent heat storage material produced by mixing the ethylene-α-olefin copolymer, paraffin 125, and aluminum flake with the above method, with the increase in the number of parts by weight of the mixed aluminum flake. It is.

Even when a latent heat storage material other than the above, such as a hydrated salt such as sodium sulfate decahydrate or a fatty acid ester, is used, the same high thermal conductivity substance as in the above example is mixed at the time of production. The conductivity can be increased.

[0010]

According to the present invention, the lower surface side latent heat storage material layer 4 is stored in the lower surface side latent heat storage material layer 4 by making the thermal conductivity of the lower surface side latent heat storage material layer 4 larger than that of the upper surface side latent heat storage material layer 2. As the amount of stored heat per unit volume increases, the efficiency of heat dissipation into the room also increases. As a result, the amount of heat released from the floor surface to the room after the heat storage increases.

[0011]

EXAMPLES Specific examples and comparative examples of the present invention will be shown below, but the present invention is not limited to the following examples without departing from the gist of the present invention.

Example In this example, paraffin (paraffin 125, manufactured by Nippon Seiro Co., Ltd., phase transition temperature: 52.2 ° C., latent heat quantity: 41.4 Kca)
1 / kg) and 30% by weight of an ethylene-α-olefin copolymer (Excellen VL100 manufactured by Sumitomo Chemical Co., Ltd.).
The melt-kneaded material was formed into a plate-like body having a thickness of 20 mm for use as the upper surface side latent heat storage material layer 2 (thermal conductivity 0.20 kcal / m · h · ° C.). Further, a plate-like body having a thickness of 20 mm produced by mixing 70 parts by weight of the same paraffin and ethylene-α-olefin copolymer as described above, and 30 parts by weight of 30 parts by weight of aluminum flake was used as a lower surface side latent heat storage material layer. 4 (thermal conductivity 0.69 kc
al / m · h · ° C)).

The above two plate-like members are arranged above and below the electric heater 3 (capacity: 300 W / m ² ), and the latent heat storage material layers 2, 4
To form the heat storage floor heating device of the present invention. Under the heat storage floor heating device, a heat insulating material 5 made of glass wool having a thickness of 100 mm was laid, and a heat-resistant flooring having a thickness of 15 mm was laid as a floor finishing material 1 thereon, thus completing the construction.

Comparative Example A dimension similar to that of the embodiment except that the latent heat storage material layers 2 and 4 arranged on the upper surface side and the lower surface side of the electric heater 3 were the same as the upper surface side latent heat storage material layer 2 of the embodiment. The heat storage floor heating device of the configuration was obtained and installed under the floor.

-Testing- A cycle of 24 hours was used, and the energization time of the electric heater 3 was set to 8 hours from 23:00 to 7:00, and the remaining 16 hours were set to the heat radiation time from the latent heat storage materials 2 and 4. During the power supply time, the control was performed so that the power supply was automatically stopped when the surface temperature of the heater 3 reached 70 ° C.

After repeating this cycle three times so that the temperature of each part was the same as that of the long-time operation, one cycle of operation was performed while measuring the room temperature and the surface temperature of the floor covering 1.

FIG. 3 shows the change in room temperature during one cycle.
FIG. 4 shows the temperature change of the surface of the floor covering 1. In the figure, the solid line represents the measurement results of the example and the broken line represents the measurement results of the comparative example, and the arrow parallel to the horizontal axis represents the electric heater 3.
Represents the operation time. 3 and 4, the latent heat storage material layer 4 on the lower surface side of the heater 3 has a higher thermal conductivity than the latent heat storage material layer 2 on the upper surface side of the heater 3, and the latent heat As compared with the comparative example in which the thermal conductivity of the heat storage material layers 2 and 4 is the same, the heat radiation during heat storage is suppressed, and a larger heat radiation amount is obtained during the heat radiation time.

[0018]

As described above, the heat storage and heating device of the present invention suppresses the heat radiation during the heat storage with almost no change in the running cost, and obtains a larger heat radiation amount during the heat radiation time. That is, a larger heating effect can be obtained even with the same amount of electricity.

[Brief description of the drawings]

FIG. 1 is a sectional view illustrating an embodiment of the present invention.

FIG. 2 is a graph showing the rate of increase in thermal conductivity with respect to an increase in a mixed part by weight of aluminum flake of a heat storage body.

FIG. 3 is a graph showing changes in room temperature in Examples and Comparative Examples.

FIG. 4 is a graph showing a change in floor material surface temperature in Examples and Comparative Examples.

FIG. 5 is a sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Floor finishing material 2 Upper surface side latent heat storage material layer 3 Heater 4 Lower surface side latent heat storage material layer 5 Insulation material

(56) References JP-A-63-201434 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24D 13/02 F24D 11/00

Claims (1)

(57) [Claims] 1. A planar heat storage floor heating device comprising a heater and a latent heat storage material for storing heat from the heater, wherein the latent heat storage material layers 2, 4 are arranged in a plane.
Characterized in that the thermal conductivity of the latent heat storage material layer 4 on the lower surface side of the heater 3 is higher than the thermal conductivity of the latent heat storage material layer 5 on the upper surface side of the heater 3. Heating system.