JP2004232897A - Complex heat storage device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a complex heat storage device particularly usable for both floor heating and floor cooling. <P>SOLUTION: At least two types of latent heat type heat storage materials are filled in a container 1. The first heat storage material h1 has a melting point in an intermediate temperature area, the second one has a melting point in a high temperature area, and the third one has a melting point in a low temperature area. The melting point in the high temperature area is suitable for strong heating, the intermediate temperature area is suitable for normal heating, and the low temperature area is suitable for cooling. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an improvement of a combined heat storage device suitable for a room temperature control device capable of performing floor heating and floor cooling.
[0002]
[Prior art]
As the floor heating device, an electric heating type and a hot water heating type are used. An electric heating type floor heating device is, for example, a sheet heating element laid on a heat insulating sheet laid on a concrete floor or a floor plate, and a structure in which a floor plate is laid thereon or a heat storage material is further disposed on the heating element. Is known. Further, there is also known an arrangement in which a heating cable is arranged in a meandering groove formed on the surface of a mat-like heat storage material.
[0003]
On the other hand, hot-water floor heating systems are installed outdoors by placing small-diameter copper pipes or polyethylene or polypropylene pipes in grooves meandering on the concrete floor or the surface of the insulation board laid on the floorboard. Some boilers supply hot water or a heat medium.
[0004]
This hot-water floor heating device is widely used because heating cost is low because gas or kerosene is used as a heat source as compared with the electricity bill. However, in the case of this hot water type heating apparatus, the heat supply source is a boiler which is installed outdoors, and the hot water (or heat medium) supplied from the boiler sequentially radiates heat in the piping inside the floor structure. Since it is cooled by flowing, it is difficult to maintain a constant temperature by generating a temperature difference due to the floor surface portion, and has an essential problem that its life is relatively short.
[0005]
On the other hand, the electric heating type floor heating device can simultaneously heat the floor surface with energization and easily control the temperature, so that the floor surface temperature can be maintained uniformly. As is generally recognized, converting household electricity rates into heat energy for heating is often more expensive than gas or kerosene (eg, household electricity rates: 6 yen, nighttime electricity rates: 3 to 6). Circle).
[0006]
By the way, considering the estimation of the ratio of heat energy stored in a room heated in winter, when the air in the room is 1, the ratio of the wall surface and the ceiling surface is 19, and the ratio of the heating floor structure is 80. From the ratio of such thermal energy, it is understood that the amount of thermal energy held by the heating floor structure is significantly larger than the thermal energy of other parts.
[0007]
Considering the electricity rate consumed for heat energy as described above, heat is stored in the heating floor structure as much as possible with nighttime electric power, and the stored heat energy is released into the room during the daytime to provide thermal energy. By controlling the energization so as to consume as little power as possible during the daytime while maintaining the balance, it is possible to heat at a low heating cost.
[0008]
Also, considering the conditions of cooling and heating, it is said that efficient cooling can be performed if there is a temperature difference of about 5 ° C from the outside air temperature during cooling in summer, and the recommended cooling temperature is 26-28 ° C. Considering the heating conditions, if the outside air temperature in winter is 10 ° C. or less and the temperature in the heated room is 18 ° C. to 20 ° C., the heating effect can be sufficiently felt.
[0009]
It can be seen that by storing heat in the floor structure using nighttime electric power in winter and releasing it as heat energy during daytime, heating can be performed at extremely low cost. As a heat storage material (agent) having a function of storing heat energy, sodium sulfate decahydrate (Na ₂ SO ₄ · 10H ₂₀ : sodium sulfate) is used (for example, see Patent Document 1).
[0010]
[Patent Document 1]
JP-A-4-12370
However, in the case of the heat storage material used in the control method of the regenerative electric heater of the invention described in the above-mentioned publication, it has the property of melting at 28 ° C. and solidifying at 25 ° C. and having one melting point or softening. I only have points. Therefore, the floor structure using this heat storage material is capable of absorbing the latent heat and melting it by heating the heat storage material while controlling the temperature to 30 ° C. by heating the sheet heating element by night power, for example, so that the floor structure becomes molten. Can store large heat energy. Then, during the daytime heating, the room can be heated at low cost for a long time while radiating heat energy consisting of sensible heat and latent heat of the heat storage material.
[0012]
On the other hand, considering the state of cooling, for example, in summer, the temperature of the outside air becomes 30 ° C. or more, particularly 40 ° C. or more. At the time of cooling in this case, the cooling effect can be sufficiently felt at a temperature lower by about 5 ° C. than the outside air temperature.
[0013]
As shown in FIG. 1, the temperature control range A in the room of the air conditioner during cooling is 28 ° C. to 31 ° C., and the temperature control range B in the room during heating is 18 ° C. to 20 ° C. Thus, the temperature range of cooling and heating is a wide range of 31 ° C to 18 ° C.
[0014]
For example, by combining an air conditioner with an electric heating or heating medium circulation type floor heating device, it is possible to efficiently perform three-dimensional heating of both air heating and heating by the air conditioner and heating from the floor heating device.
[0015]
Recently, a method of cooling a floor by flowing a refrigerant cooled to a predetermined temperature in a meandering pipe inside a floor structure has been developed. However, combining air conditioning (cooling) with the air conditioner and floor cooling has been developed. Thereby, economical room temperature control can be performed.
[0016]
As described in Patent Literature 1, it is apparent that by configuring a floor heating device combining a heating element and a heat storage material, floor heating can be effectively performed using nighttime electric power. By combining the heating and cooling by the air conditioner and the floor heating and the floor cooling of the new concept as described above, the heating and cooling can be performed at low cost.
[0017]
Although the effect of the heat storage material in floor heating is as described above, if it is possible to store cold heat in this heat storage material by night power using a low melting point heat storage material, the night power is used as a main heat source throughout the year. It is possible to adjust the room for heating and cooling.
[0018]
When sodium sulfate decahydrate is used as the heat storage material used for floor heating, the melting point is 28 ° C. and the freezing point is 25 ° C. Therefore, this heat storage material cannot be used for floor cooling, and this floor cooling is realized. Had many difficulties. Usually, only one kind of heat storage material is used, and it was impossible to use this as a heat storage material having a wide temperature range.
[0019]
Even if floor heating can be performed in this way, floor cooling is an unknown field, and in order to be able to implement this at low cost without making significant changes to the conventional heating floor structure, heating is required. A heat storage material that can be used for both air conditioning and cooling is required.
[0020]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a composite heat storage material which solves the problem that the temperature range of heat storage of the conventional heat storage material is extremely narrow and only heating can be used.
[0021]
[Means for Solving the Problems]
A composite heat storage material according to the present invention for achieving the above object is configured as follows.
[0022]
1) One container is filled with at least two types of latent heat type heat storage materials.
[0023]
2) One container is filled with at least two types of latent heat type heat storage materials, the first heat storage material has a melting point in a high temperature range, the second heat storage material has a melting point in a medium temperature range, and a third heat storage material. The materials each have a melting point in a low temperature range, the melting point in the high temperature range is a temperature suitable for strong heating, the middle temperature range is a temperature suitable for normal heating, and the low temperature range is a temperature suitable for cooling. Features.
[0024]
3) The first heat storage material has a melting point of 41 to 39 ° C, the second heat storage material has a melting point of 31 to 28 ° C, and the third heat storage material has a melting point of 20 to 14 ° C.
[0025]
4) One container is filled with at least two kinds of latent heat type heat storage materials, the first heat storage material has a melting point in a high temperature range, the second heat storage material has a melting point in a medium temperature range, and a third heat storage material. The material has a melting point in a low temperature range, and the second and third heat storage materials are formed in a capsule shape.
[0026]
5) One container is filled with at least two types of latent heat type heat storage materials, the first heat storage material has a melting point in a high temperature range, the second heat storage material has a melting point in a medium temperature range, and a third heat storage material. The material has a melting point in a low temperature range, and the second and third heat storage materials are filled in a partition wall.
[0027]
6) The heat storage device is characterized in that the heat storage device is provided in addition to a heat radiation / heat absorption member in which a refrigerant for heating and cooling is arranged.
[0028]
In short, the present invention controls the living space to a comfortable temperature in consideration of the time of heating and cooling accompanying a change in temperature from winter to summer, but in particular, by providing a pipe through which a refrigerant passes in the floor structure. By using the same floor structure, not only heating but also cooling can be assisted.
[0029]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the composite heat storage device of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing a main part of a composite heat storage device 1 according to the present invention, in which a container 2 is filled with a first heat storage material h1, a second heat storage material h2, and a third heat storage material h3. ing.
[0030]
The container 2 is, for example, an aluminum plate having a thickness t of 1.5 mm, a thin plate or a thin box having a thickness H of 15 mm, a width B of 250 to 500 mm, and a length of 2500 mm.
[0031]
A) First heat storage material The first heat storage material h1 is a base heat storage material, and uses sodium sulfate (Na ₂ SO ₄ .10H ₂ O). Examples of the heat storage material h1 include inorganic salts having water of crystallization such as potassium fluoride, calcium chloride, barium hydroxide, strontium hydroxide, sodium thiosulfate, calcium sulfate, ammonium alum, and organic salts having water of crystallization such as acetic acid. Substances used as various heat storage materials, such as sodium and sodium acetate mixed salts, can be selected and used.
[0032]
Inorganic salts or organic salts having water of crystallization use heat storage due to heat of fusion when releasing water of crystallization, heat radiation due to latent heat of solidification when combined with water of crystallization, and therefore, a large amount of latent heat in a small capacity, It is a substance that can release heat.
[0033]
B) Regarding the second heat storage material and the third heat storage material The second heat storage material and the third heat storage material exhibit different behavior from the first heat storage material, and all of these heat storage materials are melted. However, it is necessary that they do not mix and react with each other.
[0034]
Specifically, normal paraffin can be used. The normal paraffin a) n- tetradecane _{(C 14 H 30), b} ) n- pentadecane _(C 15 _{H 32)} or c) those having carbon numbers of n- hexadecane _{(C 16 H 34), a} ) the The melting point is 5.9 ° C. and the heat of fusion is 54.8 cal / g. Further, the melting point of c) is 18.2 ° C. and the heat of fusion is 54.6 cal / g.
[0035]
Since it is known that the melting point can be adjusted by the carbon number of normal paraffin as described above, the melting point (15 to 18 ° C.) suitable for a cooling floor, which has never existed before, can be obtained by using it alone or in combination. Can be selected.
[0036]
Although not shown in FIG. 1, a serpentine tube for circulating a refrigerant is disposed in a supporting floor surface below the thin plate-shaped composite heat storage device 1, and a temperature suitable for cooling by a refrigerator (about 10 ° C.). ) Is supplied and circulated.
[0037]
Normal paraffin used as the second and third heat storage materials used in the heat storage material of the present invention is preferably finished as microcapsules, pipes, or partition walls. Although a detailed description of the method for producing the microcapsules is omitted, a core material comprising a heat storage material such as normal paraffin inside using a polyolefin resin such as an acrylic resin or polyethylene as an outer core (wall resin). Is formed.
[0038]
In the present invention, it is most preferable that the shape of the heat storage material is a microcapsule, but the present invention is not limited to this.A thin tube filled with a heat storage material, a thin wiener sausage shape, or a granular shape Alternatively, a capsule in the form of a medicine, a partition, and the like, which is partitioned and accommodated therein, can be used.
[0039]
In the case of performing both “floor heating and floor cooling” using the combined heat storage device as in the present invention, the following temperature control method may be applied.
[0040]
For example, a heat storage material having a melting point above and below the center is used as a heat storage material (first heat storage material), which melts when the temperature exceeds 31 ° C. and solidifies when the temperature becomes 28 ° C. or less.
[0041]
That is, a heat storage material having a temperature range of “+ 10 ° C., −15 ° C.” around 30 ° C. and showing a peak of latent heat of solidification near 40 ° C., 30 ° C., and 15 ° C. is used.
[0042]
For example, the content ratio of the first heat storage material having a melting point of about 30 ° C. is “5”, the content of the second heat storage material having a melting point of about 40 ° C. is “2”, and the melting point of about 15 ° C. A composite heat storage device filled with a heat storage material having a content of the third heat storage material having the value of “3” is used.
[0043]
By using the combined heat storage device as a heat storage device having a floor heating structure and a floor cooling structure, it can be used as a floor cooling device in summer and as a floor heating device in winter.
[0044]
And, as described above, by storing heat energy in the combined heat storage device using low-cost nighttime power, or storing cold heat, it is possible to perform not only floor heating but also floor cooling. You can.
[0045]
In the embodiment, three types of heat storage materials having different melting temperatures are used. However, at least two types of heat storage materials can be used.
[0046]
FIG. 2 shows a case in which a synthetic resin pipe or aluminum pipes P1 and P2 in which second and third heat storage materials are sealed are disposed inside a container 2, and a first heat storage material is provided outside these pipes P1 and P2. The composite heat storage device filled with the material h1 is shown.
[0047]
FIG. 3 shows a combined heat storage device in which a small room is formed by partitions S1 and S2, and the inside thereof is filled with heat storage materials h2 and h3.
[0048]
FIG. 4 shows partitions S1 and S2 formed between both the top plate and the bottom plate of the container 2, and a tunnel T is opened at an intermediate portion thereof to facilitate movement of the heat storage material h1 and improve heat transfer. The heat storage material is designed so that melting and solidification can be accurately performed at a predetermined temperature. Although details are not shown, a pipe may not be used as shown in FIG. 2, but a bag or a cylindrical body made of a synthetic resin film may be used and a heat storage material may be sealed in the inside to partition.
[0049]
【The invention's effect】
In the composite heat storage device according to the present invention, one container is filled with at least two types of latent heat type heat storage materials, the first heat storage material has a melting point in a high temperature range, and the second heat storage material has a medium temperature range. , The third heat storage material has a melting point in the low temperature range, the melting point in the high temperature range is a temperature suitable for strong heating, the middle temperature range is a temperature suitable for normal heating, and the low temperature range is cooling. The temperature is suitable for
[0050]
Therefore, the temperature range for storing heat can be made much wider than that of the conventional heat storage material, so that not only floor heating in winter but also floor cooling in summer can be performed. Moreover, in the heat storage process, a low-cost and comfortable atmosphere can be adjusted by using inexpensive nighttime power.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a main part of a composite heat storage device.
FIG. 2 is a cross-sectional view showing a main part of a composite heat storage device using a pipe as a partition.
FIG. 3 is a cross-sectional view showing a main part of a composite heat storage device using a mold material for a partition.
FIG. 4 is a cross-sectional view showing a main part of the composite heat storage device in which a partition is formed to form a partition wall extending to the inner surfaces of the front and back wall surfaces.
[Explanation of symbols]
Reference Signs List 1 composite heat storage device H thickness B width h1 first heat storage material (for medium temperature range) h2 second heat storage material (for high temperature range)
h3 Third heat storage material (low temperature, for cooling)

Claims (6)

A combined heat storage device in which one container is filled with at least two types of latent heat type heat storage materials. At least two types of latent heat type heat storage materials are filled in one container, the first heat storage material has a melting point in a high temperature range, the second heat storage material has a melting point in a medium temperature range, and the third heat storage material has Each having a melting point of a low temperature range, the melting point of the high temperature range is a temperature suitable for strong heating, the middle temperature range is a temperature suitable for normal heating, and the low temperature range is a temperature suitable for cooling. The combined heat storage device according to claim 1. The composite heat storage according to claim 1, wherein the first heat storage material has a melting point of 41 to 39C, the second heat storage material has a melting point of 31 to 28C, and the third heat storage material has a melting point of 20 to 14C. apparatus. At least two types of latent heat type heat storage materials are filled in one container, the first heat storage material has a melting point in a high temperature range, the second heat storage material has a melting point in a medium temperature range, and the third heat storage material has The composite heat storage device according to claim 1, wherein each of the second and third heat storage materials has a melting point in a low temperature range and is formed in a capsule shape. At least two types of latent heat type heat storage materials are filled in one container, the first heat storage material has a melting point in a high temperature range, the second heat storage material has a melting point in a medium temperature range, and the third heat storage material has The composite heat storage device according to claim 1, wherein each of the second and third heat storage materials has a melting point in a low temperature range and is filled in a partition wall. The combined heat storage device according to claim 1, wherein the heat storage device is provided in addition to a heat radiation / heat absorption member in which a refrigerant to be heated and cooled is arranged.

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