JP2009097746A - Heat storage device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve heat exchanging performance by increasing the contact area of a heat storage means and a heat transferring wall while improving pressure resisting performance of the heat transferring wall. <P>SOLUTION: This heat storage device comprises:the heat storage means 4 constituted by shaping a latent-heat heat storage agent which is solid in non-heat storage and a liquid in heat storage, into the flat plate shape and packing it in vacuum; and the heat transferring wall 5 retaining the heat storage means 4 in a state of holding it therebetween and having a concave and convex surface to transfer and receive heat to the latent heat-heat storage agent, and the heat storage means 4 also has a concave and convex surface oppositely to the concavity and convexity of the heat transferring wall 5. Thus the contact area of the latent heat-heat storage agent and the heat transferring wall 5 is increased, and the pressure-resisting performance of a path of the fluid exchanging heat with the heat storage means 4 through the heat transferring wall 5 is improved. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a heat storage device equipped with a latent heat storage agent.

  As a method of performing heat storage, a heat storage device that uses a phase change of a latent heat storage agent that becomes a solid when not storing heat and becomes a liquid when storing heat is well known, and a heat storage capsule in which this latent heat storage agent is filled in a capsule-like container and An apparatus for storing and releasing heat by exchanging heat of a fluid to be heated has already been put into practical use.

  Here, when the capsule-shaped container is filled with the latent heat storage agent, there is a possibility that the thermal resistance between the heat transfer surface that performs heat exchange may increase, and the volume occupied by the container tends to increase. The filling amount of the latent heat storage agent per volume will decrease.

In order to solve this problem, an attempt has been shown to fill a bag formed of a thin aluminum laminate film with a latent heat storage agent and vacuum pack it (for example, see Patent Document 1).
Utility Model Registration No. 3115086

  Here, in order to heat and cool the heat storage device described in Patent Document 1, a heat transfer wall that directly contacts the heat storage device and a fluid passage for exchanging heat with a heat source such as water through the heat transfer wall are necessary. . Normally, the heat transfer wall and the fluid passage are integrally molded, but in order to improve pressure resistance, the heat transfer wall is provided with irregularities to prevent the heat transfer wall from being deformed by the pressure of water or the like flowing in the fluid passage. ing.

  However, by adopting this structure, the contact area between the heat storage means and the heat transfer wall is reduced, and it is expected that extra time will be spent when heating and cooling.

  This invention solves the said conventional subject, and it aims at expanding the contact area of a thermal storage means and a heat-transfer wall, improving heat exchange performance, improving the pressure | voltage resistant performance of a heat-transfer wall.

  In order to solve the above-mentioned conventional problems, a heat storage device of the present invention includes a latent heat storage agent that is solid when not storing heat and becomes liquid when storing heat, and a heat storage unit that forms the latent heat storage agent into a flat plate shape and applies a vacuum pack. A heat transfer wall provided with unevenness on the surface for holding the heat storage means and transferring heat to the latent heat storage agent, and facing the unevenness provided on the heat transfer wall, The surface of the heat storage means is provided with irregularities so that the contact area between the heat storage means and the heat transfer wall can be expanded, and heat can be effectively exchanged with the heat transfer wall. It will be.

  ADVANTAGE OF THE INVENTION According to this invention, the contact area of a heat storage means and a heat transfer wall can be expanded, improving the pressure | voltage resistant performance of a heat transfer wall, and the heat storage apparatus which improved the heat exchange performance can be provided.

The first invention comprises a latent heat storage agent that becomes a solid when not storing heat and becomes a liquid when storing heat, a heat storage means that forms the flat plate shape of the latent heat storage agent and applies a vacuum pack, and holds the heat storage means so as to sandwich the heat storage means. A heat transfer wall provided with unevenness on the surface for transferring heat to the latent heat storage agent, and provided with unevenness on the surface of the heat storage means so as to face the unevenness provided on the heat transfer wall. It is characterized by increasing the contact area between the latent heat storage agent and the heat transfer wall and improving the pressure resistance performance of the fluid passage that exchanges heat with the heat storage means through the heat transfer wall.

  In particular, the second invention has a heat transfer promoting material made of a material having a higher thermal conductivity than the latent heat storage agent inside the heat storage means of the first invention. The rate can be improved and the heat transfer performance can be improved.

  In the third invention, in particular, the main component of the latent heat storage agent of the first invention or the second invention is sodium acetate trihydrate, so that highly efficient heat storage performance and heat dissipation performance can be realized. it can.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.

(Embodiment 1)
FIG. 1 is a front cross-sectional view of a heat storage device in Embodiment 1 of the present invention, FIG. 2 is a side cross-sectional view of the heat storage device in Embodiment 1 of the present invention, and FIG. 3 shows the heat storage device in Embodiment 1 of the present invention. FIG. 4 is a perspective view of the heat storage means in the first embodiment of the present invention.

  The heat storage device 1 is largely held in the heat storage means 4 by holding the heat storage means 4 in which the latent heat storage agent 3 sealed in a flat plate shape is sealed in a bag 2 made of an aluminum laminate film and sandwiching the heat storage means 4 from both sides. A heat transfer wall 5 for transferring heat to and from the two heat transfer walls 5 and a fluid passage 6 through which a fluid (here, water) for heating or cooling the heat storage means 4 flows. Heating means for heating the hot water for storing heat in the heat storage means 4 and the heat insulating means 7 constituted by urethane foam or urethane slab to prevent heat leakage from the means 4, the heat transfer wall 5 and the fluid passage 6 to the outside. 8.

  The heat transfer wall 5 has a structure in which two copper plates are bonded together and is bonded by soldering or brazing. A fluid passage 6 through which water or hot water flows is formed between two copper plates, but the copper plate has a thickness of about 0.3 to 0.5 mm in order to increase the heat storage agent filling amount per unit volume. The pressure resistance is improved by providing irregularities at regular intervals and bonding the concave portions by soldering or brazing.

  Hot water flows through the fluid passage 6 when storing heat, and water flows when radiating heat. The heat storage means 4 is shaped to have a width of 200 mm, a height of 200 mm, and a thickness of 20 mm, which is easy to handle and carry. The latent heat storage agent 3 enclosed in the heat storage means 4 is currently used in general households. The main component having a melting point of about 60 ° C., which is the same temperature as the hot water storage temperature of a water heater having a hot water storage tank, is composed of sodium acetate trihydrate.

  Sodium acetate trihydrate has a low thermal conductivity of about 0.7 W / mK, and it is expected that heat transferred from the heat transfer wall 5 will not be sufficiently transferred to the entire latent heat storage agent 3 as it is. For this reason, the thermal conductivity is improved by filling the inside of the latent heat storage agent 3 with the heat transfer promoting material 9 having a thermal conductivity higher than that of sodium acetate trihydrate. The heat transfer facilitator 9 can be used as long as it has a higher thermal conductivity than sodium acetate trihydrate, but it is filled with a copper wire mesh that has high thermal conductivity and is easily available and relatively inexpensive. Thus, the thermal conductivity of the heat storage means 4 can be improved 10 times or more.

The surface of the heat storage means 4 is provided with unevenness so as to correspond to the unevenness provided on the surface of the heat transfer wall 5, and the protrusion of the heat storage means 4 and the protrusion of the heat transfer wall 5 are formed in the recess of the heat transfer wall 5. The recess of the heat storage means 4 is accommodated. With this structure, it is possible to increase the chargeable amount of the latent heat storage agent 3 and to increase the contact area with the heat transfer wall 5, thereby improving the heat exchange performance.

  A 1 mm thick rubber plate is cut into a width of 20 mm for the purpose of protection so that the aluminum laminate film is not damaged at the end face of the wire mesh around the heat transfer promoting material 9 and used as a protective material 10 on both sides and bottom. . Hot water used at the time of heat storage is heated from room temperature water to about 65 to 80 ° C. by the heating means 8. Of course, the heating means 8 may be a boiler, an electric heater, or the like, but considering the recent trend of energy saving, heating by a heat pump is preferable because of its excellent energy efficiency.

  Since the heat storage means 4, the heat transfer wall 5, and the fluid passage 6 have a large temperature difference from the outside and the heat storage performance is expected to deteriorate due to heat leakage to the outside, the heat storage means 4, the heat transfer wall 5, and the fluid passage 6 are configured by glass wool, polystyrene foam, rigid urethane slab, etc. The heat insulating means 7 is used to block heat from entering and exiting the outside.

  When this heat storage device 1 is used for hot water supply in a general household, although the required amount of the latent heat storage agent 3 is about 100 to 300 kg depending on the home environment, installation space, etc., the heat storage means 4 with the above dimensions is 90 to 90 kg. About 270 are required. In order to install this quantity of the heat storage means 4 in a certain space, the heat storage means 4, the heat insulation wall 5 and the fluid passage 6 are stacked in the thickness direction to save space.

  First, a heat transfer wall 5 having a fluid passage 6 therein is installed at the end, and a certain number of heat storage means 4 are arranged next to the heat transfer wall 5. With the structure of the heat transfer wall 5 on the side and the heat storage means 4 on the side, the latent heat storage agent 3 can be filled up to a certain volume to the maximum without having a useless space.

  The operation of the water heater using the heat storage device 1 will be described. When the heat storage operation is performed, hot water heated by the heating means 8 is passed through the fluid passage 6 through the circulation pump 11 to store heat in the latent heat storage agent 3. When the temperature of the latent heat storage agent 3 is lower than the temperature of hot water, the heat of the hot water moves to the latent heat storage agent 3 through the heat transfer wall 5. The latent heat storage agent 3 undergoes a phase change from solid to liquid as the temperature rises and stores heat in the latent heat region. However, since the volume expands when melted, the liquefied latent heat storage agent 3 is placed in the extra space in the bag 2. Move.

  At this time, when the movement in the thickness direction is restricted from the outside by the heat insulating means 7 or the like, a load is applied in the direction of pushing the heat transfer wall 5 by the weight of the latent heat storage agent 3, and latent heat is applied to the uneven portion of the heat transfer wall 5. When the heat storage agent 3 further moves, the adhesion between the heat transfer wall 5 and the heat storage means 4 can be improved, and the thermal conductivity can be further improved. When this operation is continuously performed, in the case of the sodium acetate trihydrate-based latent heat storage agent 3, since the melting point is about 60 ° C., the heat storage is completed when the temperature is exceeded.

  When the heat storage is completed, hot water having a predetermined temperature can be used when necessary. When a faucet or the like is opened to use hot water, the water supplied from the water supply is heated by exchanging heat with the latent heat storage agent 3 in the heat storage means 4 through the heat transfer wall 5 and then mixed with the water by the mixing valve 12. After being mixed and adjusted to a predetermined temperature, it is sent to a use system and used for a bath, a shower and the like. When the heat of the latent heat storage agent 3 is fully utilized and radiated, the phase changes from liquid to solid. Since the volume of the latent heat storage agent 3 decreases when it solidifies due to the phase change, the latent heat storage agent 3 in the heat storage means 4 undergoes a phase change to a solid while maintaining close contact with the heat transfer wall 5 while leaving a space above. Do.

  Note that the various materials and numerical values shown in this embodiment are not necessarily limited to these, and there is no problem with other materials and numerical values as long as they can play a predetermined role.

  As described above, the heat storage device according to the present invention can improve the heat transfer performance between the latent heat storage agent and the heat transfer wall while improving the pressure resistance performance of the heat transfer wall. It can be used in general heat exchange equipment using materials with

The perspective view of the thermal storage means which comprises the thermal storage apparatus in Embodiment 1 of this invention Internal structure diagram of heat storage means constituting the heat storage device Side sectional view of the heat storage device Top sectional view of the heat storage device Configuration diagram of a water heater using the heat storage device Schematic of the heat transfer wall and fluid passage

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat storage apparatus 2 Bag 3 Latent heat storage agent 4 Heat storage means 5 Heat transfer wall 6 Fluid path 9 Heat transfer promotion material

Claims (3)

A latent heat storage agent that becomes solid when not storing heat and becomes liquid when storing heat, a heat storage means that forms the flat plate shape of the latent heat storage agent and that is vacuum packed, and holds the heat storage means so as to sandwich the latent heat storage agent against the latent heat storage agent A heat storage device comprising a heat transfer wall provided with unevenness on a surface for transferring heat, and provided with unevenness on the surface of the heat storage means so as to face the unevenness provided on the heat transfer wall. The heat storage device according to claim 1, further comprising a heat transfer promoting material made of a material having a higher thermal conductivity than the latent heat storage agent inside the heat storage means. The heat storage device according to claim 1 or 2, wherein the main component of the latent heat storage agent is sodium acetate trihydrate.

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