JP7168166B2 - Heat accumulator and hot water production device equipped with the same - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heat accumulator using a phase change material and a hot water producing apparatus including the same.

2. Description of the Related Art Conventionally, hot water producing apparatuses using waste heat, residual heat, geothermal heat, solar heat, thermal power, electric heat, etc. as heat sources have been used to produce hot water.

In the hot water producing apparatus described above, a method of directly heating the piping and the hot water container by a heat source has been adopted in order to produce hot water. Therefore, when the power source of the heat source is turned off, there is a problem that the temperature inside the hot water producing apparatus decreases due to the heat radiation.

In recent years, in order to solve such problems, development of a heat storage device for hot water production using a phase change material called PCM (Phase Change Material) as a heat storage material is progressing.

A phase change material is a material that stores thermal energy by utilizing the absorption and release of heat that occurs in the process of phase change between a solid phase and a liquid phase. That is, the phase-change material can repeatedly absorb and release heat depending on the ambient temperature, and when it melts due to heat accumulation, it changes to a liquid, and when the temperature drops below the melting point due to heat dissipation, it changes to a solid.

For example, Patent Literature 1 describes a heat storage device using a heat storage material containing a phase change material.
This heat storage device includes a housing, a heat storage material housed inside the housing, flow path pipes through which a heat medium flows and is arranged to penetrate the housing, and heat storage material inside and outside the housing. and a transfer device for transferring between. In addition, the transfer device collects graphite particles and SiC particles contained in the heat storage material outside the housing at a temperature near the melting point of the heat storage material.
With such a configuration, it is possible to suppress events such as voltage fluctuations and frequency fluctuations in the solar thermal power generation system even if weather changes such as changes in the amount of sunlight occur, so that stable supply of thermal energy is possible. Become.

JP 2017-48265 A

Here, the phase change material has the property of being excellent in heat storage, but low in thermal conductivity. For this reason, if the housing that accommodates the phase change material is large, it will take a long time to completely dissolve the central portion of the phase change material.

Further, for example, when the power of the heat storage device is turned off and left for a long time, the temperature inside the housing decreases, and the phase change material as a whole becomes solid. Therefore, it takes a long time again to re-melt the phase-change material after restarting the heat storage device.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to provide a heat accumulator with improved heat storage efficiency by efficiently dissolving a phase change material, and a hot water producing apparatus equipped with the same. do.

In order to solve the above problems, the present invention includes a phase change material container for accommodating a phase change material therein, a heater section, and a pump section,
The heater unit is provided on the outer peripheral surface of the phase change material container,
The pump unit includes a pump body provided with a driving source, a suction port connected to the pump body for sucking the phase change material, and a discharge port connected to the pump body for discharging the phase change material. , has
The phase change material is in contact with the outer peripheral surface of the pump section.

According to the present invention, since the phase change material is in contact with the outer peripheral surface of the pump section, the pump section can suck and discharge the phase change material heated and melted by the heater section. . Then, the ejected phase change material contacts the undissolved phase change material, and the undissolved phase change material dissolves. That is, by increasing the heat exchange area between the melted phase-change material and the unmelted phase-change material, it is possible to melt the entire phase-change material efficiently.

A preferred embodiment of the present invention is characterized in that the suction port is provided near the bottom surface of the phase-change material container.

Since the heated and melted phase-change material accumulates at the bottom due to gravity, such a configuration increases the amount of the melted phase-change material sucked into the suction port, thereby dissolving the entire phase-change material. Improve efficiency.

Further, the present invention provides a hot water producing apparatus comprising the heat accumulator, a water reservoir containing water therein, and a piping section for transporting the water,
The piping part is arranged inside the phase-change material container and the water reservoir,
The phase change material is characterized in that it is in contact with the outer peripheral surface of the pipe portion.

With such a configuration, the water passing through the pipe portion is heated by the dissolved phase-change material, so that hot water can be efficiently produced.

A preferred embodiment of the present invention is characterized in that the phase-change material container and the water reservoir are provided adjacent to each other.

With such a configuration, the phase-change material container and the water reservoir can exchange heat with each other, and high heat retention in the water reservoir can be maintained.

A preferred embodiment of the present invention is characterized in that the piping section is arranged so as to surround the outer periphery of the pump section.

By adopting such a configuration, the undissolved phase change material inside the pump can be dissolved by the hot water passing through the piping, and the driving source of the pump can be quickly driven, thereby allowing the suction and suction of the pump. It becomes possible to start the discharge operation smoothly.

ADVANTAGE OF THE INVENTION According to this invention, the heat accumulator which improved heat storage efficiency by melt|dissolving a phase change material efficiently, and a warm water production apparatus provided with the same can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the heat storage device which concerns on embodiment of this invention, Comprising: (a) Schematic perspective view, (b) It is an internal structure drawing. It is a figure which shows the inner container in the heat storage device which concerns on embodiment of this invention, Comprising: (a) It is a schematic perspective view, (b) It is a bottom view. FIG. 4 is a schematic perspective view showing a pump section in the heat accumulator according to the embodiment of the present invention; FIG. 4 is an internal structural diagram of the heat accumulator according to the embodiment of the present invention, showing a process of melting of the phase change material. 1 is a schematic perspective view of a hot water producing apparatus according to an embodiment of the present invention; FIG. 1 is an internal structural diagram of a hot water producing apparatus according to an embodiment of the present invention; FIG.

Hereinafter, a heat accumulator and a hot water producing apparatus including the same according to an embodiment of the present invention will be described with reference to FIGS. 1 to 6. FIG.
In addition, the embodiment shown below is an example of the present invention, and the present invention is not limited to the following embodiments. Further, in these figures, reference numeral 1 indicates the heat accumulator of the present embodiment, and reference numeral A indicates the hot water producing apparatus of the present embodiment.

As shown in FIG. 1, the heat accumulator 1 includes a phase change material container CM containing a phase change material M, a heater section H1, and a pump section P. As shown in FIG.
The phase-change material M has two states depending on its heat storage temperature: a solid undissolved phase-change material MS and a liquid dissolved phase-change material ML.

As shown in FIG. 1A, the phase-change material container CM is composed of a substantially rectangular parallelepiped cylindrical container body CM1 with a bottom, and a lid body CM2 covering the container body CM1 from above. . Further, the lid body CM2 is provided with a controller X that performs ON/OFF control of the heater unit H1 and operation control of the pump unit P. As shown in FIG.
Here, the user of the heat accumulator 1 can freely set the heat storage temperature of the dissolved phase change material ML in advance by the control unit X, and the heater unit H1 turns on the phase change material M is melted, and the melted phase change material ML is heated to this set temperature. Then, when the melted phase change material ML reaches the set temperature, the heater part H1 is turned off. A temperature detector (not shown) for detecting a set temperature is provided inside the phase change material M and is electrically connected to the controller X.

As shown in FIG. 1(b), the container body CM1 has a double-layered structure, with an outer container CM11 formed on the outside and an inner container formed on the inside to accommodate the undissolved phase-change material MS. The CM 12 and CM 12 are configured by integrating their open ends so as to form a space RM in the gap. Water W can also be stored in the space RM.

The heating heater portion H1 is formed in a cord shape and provided on the outer peripheral surface of the inner container CM12. One end of the heater portion H1 is inserted through an insertion hole p provided in the container body CM1 and the lid CM2, and is electrically connected to the control portion X. As shown in FIG.
It should be noted that the heater portion H does not necessarily have to be cord-shaped, and a plate-shaped one may be used.

The pump part P is mounted on the bottom surface of the inner container CM12 and embedded inside the undissolved phase change material MS. That is, the undissolved phase-change material MS is in contact with the outer peripheral surface of the pump portion P. As shown in FIG.

In FIG. 1B, the undissolved phase-change material MS, the phase-change material container CM, and the heater portion H1 in contact with the outer peripheral surface of the phase-change material container CM are shown in cross section.

As shown in FIG. 2A, the heater portions H1 are provided on the side and bottom surfaces of the inner container CM12.
More specifically, the heater portion H1 is spirally wound on the side surface of the inner container CM12, and is provided on the bottom surface by adhering it in a serpentine manner.
As the means for adhering to the bottom surface of the heater portion H1, an adhesive member such as an aluminum tape or a known adhesive can be used. Moreover, it is preferable that the heater portion H1 wound around the side surface is also adhered with an adhesive member such as an aluminum tape or a known adhesive. Further, a plurality of heater portions H may be provided on the outer peripheral surface of the inner container CM12.

As shown in FIG. 3, the pump part P is entirely made of a heat-resistant material, and includes a pump main body P1 provided with a drive source (not shown) and a dissolution phase change liquid connected to the pump main body P1. It has a suction port P2 for sucking the material ML, a discharge port P3 for discharging the phase change material from the pump main body P1, and a base P4 on which the pump main body P1 is placed.
In addition, a DC24V or DC12V motor or the like can be used as the drive source.

Specifically, the pump part P has a substantially cylindrical suction pipe Pi in which a suction path Ri communicating with the suction port P2 is formed.
In addition, in FIG. 3, hidden lines of the suction path Ri are indicated by dotted lines.

Further, the pump part P is fixed to the bottom surface of the inner container CM12 via fixing tools such as bolts (not shown) inserted through mounting holes z provided at the four corners of the base P4. Furthermore, the pump section P is electrically connected to the control section X by a connection line (not shown) extending from the pump main body P1.

The process of dissolving the undissolved phase-change material MS will be described below with reference to FIG.

First, the user of the heat accumulator 1 operates the control section X to raise the temperature of the heater section H1.

As a result, as shown in FIG. 4A, the undissolved phase-change material MS in contact with the inner peripheral surface of the inner container CM12 is heated by the heater unit H1 via the inner container CM12 and melted. It becomes the phase change material ML.

Then, the volume of the dissolved phase change material ML that exists near the side surface of the inner container CM12 accumulates at the bottom due to gravity, so that the volume of the dissolved phase change material ML reaches the position of the suction port P2.

Then, the user of the heat accumulator 1 operates the control unit X to operate the pump main body P1 and start the suction/discharge operation by the pump unit P, thereby causing the pump unit P to operate the dissolved phase change material ML is aspirated (arrow a).

Next, as shown in FIG. 4B, the sucked dissolved phase change material ML is ejected from the ejection port P3 (arrow b). As a result, the undissolved phase-change material MS in contact with the ejection port P3 is melted by exchanging heat with the dissolved phase-change material ML to become the dissolved phase-change material ML.

In this manner, the entire undissolved phase-change material MS is efficiently melted as shown in FIG. It can be a phase change material ML.

A hot water producing apparatus A including the heat accumulator 1 will be described below with reference to FIGS. 5 and 6. FIG.
Note that in FIG. 6, the phase change material M, the phase change material container CM, the hot water container CW, the housing E, the outer peripheral surface of the phase change material container CM and the outer peripheral surface of the hot water container CW are in contact with the heating element. Heater portions H1 and H2 are shown in cross section. Also, in FIG. 6, the phase change material M is shown as a dissolved phase change material ML.

As shown in FIGS. 5 and 6, the hot water production apparatus A includes a heat accumulator 1, a water reservoir 2 for containing water W, a piping section 3 for sucking, transporting and discharging water W, and these. and a housing E for housing.
For convenience of explanation, the housing E is omitted in FIG.

The water reservoir 2 has a hot water container CW containing water W therein, and a heater section H2.

As with the phase-change material container CM, the hot water container CW is composed of a substantially rectangular parallelepiped cylindrical container body CW1 with a bottom, and a lid CW2 covering the container body CW1 from above.
Further, the container body CW1 has a double structure like the container body CM1. It is configured by integrating the respective open ends so as to form a space RW in the gap.

The heater portion H2 of the water reservoir 2 is formed in a cord shape, similarly to the heater portion H2 of the heat accumulator 1, is spirally wound on the side surface of the inner container CW12, and is spirally wound on the bottom surface of the inner container CW12. , are provided by adhering them in a serpentine manner.

The phase-change material container CM and the water reservoir 2 are provided adjacent to each other, and the pipe section 3 penetrates the respective lids CM2 and CW2 and is arranged inside the inner container CM12 and the inner container CW12. It is

Specifically, the piping section 3 includes a first piping 31 that is arranged in a substantially serpentine curve inside the inner container CM12, and a pump section P that extends along the side and bottom surfaces of the inner container CM12. It is composed of a second pipe 32 arranged in a curved manner so as to surround the periphery, and a third pipe 33 arranged only inside the inner container CW12.
Note that the number of pipes is not limited to three, and may be any number.

The dissolved phase change material ML is in contact with the outer peripheral surfaces of the first pipe 31 and the second pipe 32 arranged inside the inner container CM12.

Piping pumps 31P, 32P and 33P for sucking the water W contained in the inner container CW12 and the water W supplied from the outside are provided in the pipes 31, 32 and 33, respectively.
The pipe pumps 31P, 32P, and 33P are provided with drive sources in the same manner as the pump section P, and are electrically connected to the control section X by connection lines (not shown) extending from each of them.

As shown in FIG. 6, the housing E is composed of a substantially rectangular parallelepiped cylindrical housing body E1 with a bottom, and a lid E2 that covers the housing body E1 from above.
A control section X for controlling the temperature of the heater sections H1 and H2 and the operation control of the pump section P is provided on the inner wall of the housing body E1.
Note that the position of the control unit X is not limited to this, and may be provided outside the housing E.

One end of the heater portion H1 of the heat accumulator 1 is inserted through the insertion hole p provided in the container body CM1 and the lid CM2, and is electrically connected to the control portion X.
The heater part H2 of the water reservoir 2 is electrically connected to the control part X by inserting one end of the heater part H2 into the insertion hole p provided in the container body CW1 and the lid body CW2.

Here, the user of the hot water production apparatus A can freely set the temperature of the hot water in advance using the control section X, and when the heater sections H1 and H2 are turned on, the water reaches the set temperature. Heat W. When the water W reaches the set temperature, the heaters H1 and H2 are turned off. A temperature detector (not shown) for detecting a set temperature is provided inside the water W and is electrically connected to the controller X.

One end 31a of the first pipe 31 is exposed to the outside by penetrating the hot water container CW and the housing body E1, and the other end 31b is arranged in the water W contained in the inner container CW12. A valve V is provided at a portion of the first pipe 31 exposed to the outside. Furthermore, an open end 31c for sucking the water W is provided in a portion of the first pipe 31 disposed inside the inner container CW12.
One end 31a is connected to, for example, a water pipe that supplies tap water.

Both ends 32a and 32b of the second pipe 32 are placed in the water W contained in the inner container CW12.

One end 33a of the third pipe 33 is exposed to the outside by penetrating the housing main body E1, and the other end 33b is arranged in the water W contained in the inner container CW12.

A user of the hot water producing apparatus A uses the controller X to operate the pipe pump 31P when producing hot water. As a result, the first pipe 31 sucks the water W contained in the inner container CW12 from the open end 31c (arrow c).
Then, the sucked water W is heated by the dissolved phase-change material ML to become hot water when passing through the first pipe 31 arranged inside the inner container CM12, and is discharged from the other end 31b into the inner container CW12. and supplied (arrow d).

In addition, for example, when the power supply of the hot water production apparatus A is turned off for a long time and the entire phase change material M is in the state of the undissolved phase change material MS, the user quickly operates the pump part P. Therefore, the controller X is used to operate the pipe pump 32P. As a result, the second pipe 32 sucks the water W contained in the inner container CW12 from one end 32a (arrow e), and the portion of the second pipe 32 arranged so as to surround the outer periphery of the pump part P is drawn. Then, the water W is discharged from the other end 32b (arrow f).
At this time, if the water W contained in the inner container CW12 is warmed by the first pipe 31, the inside of the pump unit P is The undissolved phase-change material MS can be dissolved and the driving source of the pump section P can be driven early.

Further, when the user supplies the water W supplied inside the water reservoir 2 to the outside, the user uses the controller X to operate the pipe pump 33P. As a result, the third pipe 33 sucks the heated water W from the other end 33b (arrow g), and discharges and supplies the water W from the one end 33a to the outside (arrow h).

Further, when the user supplies water W into the water reservoir 2, the user uses the valve V to open the flow path of the pipe 31 and uses the controller X to operate the pipe pump 31P. Thereby, the first pipe 31 sucks the external water W from the one end 31a (arrow i).
Then, the sucked water W is heated by the dissolved phase-change material ML to become hot water when passing through the first pipe 31 arranged inside the inner container CM12, and is discharged from the other end 31b into the inner container CW12. and supplied (arrow d).

In this way, even while the water W is being sucked and discharged by the piping section 3, the user can, of course, H1 can be left running. As a result, when the phase-change material M is in the state of the undissolved phase-change material MS, the dissolution efficiency is improved, and when it is in the state of the dissolved phase-change material ML, the heat storage state is maintained. .

Further, when the phase-change material M is in the state of the undissolved phase-change material MS, the heat storage state is maintained for a predetermined time without operating the heater unit H1 of the pump unit P and the heat accumulator 1. Hot water can be supplied to the outside for a predetermined time only by operating the piping section 3 . That is, according to the hot water production apparatus A, the energy efficiency is improved when hot water is supplied to the outside.

According to the present embodiment, the suction port P2 is provided near the bottom surface of the phase-change material container CM. The dissolution efficiency of the entire phase change material MS is improved.

In addition, the pump unit P discharges and stirs the dissolved phase-change material ML from the discharge port P3, thereby enabling heat exchange and improving the efficiency of dissolving the entire undissolved phase-change material MS.

Further, since the dissolved phase change material ML is in contact with the outer peripheral surface of the pipe portion 3, the water W passing through the pipe portion 3 is heated by the dissolved phase change material ML, so hot water is efficiently produced. It becomes possible to

In addition, since the phase-change material container CM and the water reservoir 2 are provided adjacent to each other, the phase-change material container CM and the water reservoir 2 exchange heat with each other. It becomes possible to maintain heat retention.

In addition, since the second pipe 32 is arranged so as to surround the outer periphery of the pump part P, the hot water passing through the second pipe 32 dissolves the undissolved phase-change material MS inside the pump part P, The driving source of the portion P can be driven early, and the suction/discharge operation of the pump portion P can be started smoothly.

It should be noted that the shapes, dimensions, etc., of the constituent members shown in the above-described embodiment are merely examples, and can be changed in various ways based on design requirements and the like.

A hot water production device 1 heat accumulator CM phase change material container CM1 container main body CM11 outer container CM12 inner container CM2 lid RM space P pump section P1 pump main body P2 suction port P3 discharge port P4 base z mounting hole 2 water reservoir CW hot water Container CW1 Container body CW11 Outer container CW12 Inner container CW2 Lid RW Space H1, H2 Heater portion p Insertion hole 3 Piping portion 31 First pipe 32 Second pipe 33 Third pipe 31P, 32P, 33P Piping pump V Valve E housing E1 housing main body E2 lid X control unit W water M phase change material MS undissolved phase change material ML dissolved phase change material

Claims (3)

A hot water producing apparatus comprising a heat accumulator, a water reservoir containing water therein, and a piping section for transporting the water,
The heat accumulator includes a phase change material container for containing a phase change material therein, a heater section, and a pump section,
The heater unit is provided on the outer peripheral surface of the phase change material container,
The pump unit includes a pump body provided with a driving source, a suction port connected to the pump body for sucking the phase change material, and a discharge port connected to the pump body for discharging the phase change material. , has
the phase change material is in contact with the outer peripheral surface of the pump section ;
The piping part is arranged inside the phase-change material container and the water reservoir,
the phase change material is in contact with the outer peripheral surface of the pipe portion;
The hot water producing apparatus , wherein the piping section is arranged so as to surround the outer periphery of the pump section . 2. The hot water producing apparatus according to claim 1, wherein the suction port is provided near the bottom surface of the phase change material container. 2. The hot water producing apparatus according to claim 1 , wherein said phase change material container and said water reservoir are provided adjacent to each other.

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