JP2020056534A - Heat accumulator and hot water production device comprising the same - Google Patents

Abstract

To provide a heat accumulator that enhances heat accumulation efficiency by efficiently dissolving a phase-change material, and a hot water production device that comprises the same.SOLUTION: A heat accumulator comprises a phase-change material container CM internally housing a phase-change material M, a heating heater part H1, and a pump part P. The heating heater part H1 is provided on an outer peripheral surface of the phase-change material container CM. The pump part P comprises: a pump body P1 provided with a driving source; a suction port P2 connected to the pump body P1, and for sucking the phase-change material M; and a discharge port P3 connected to the pump body P1, and for discharging the phase-change material M. The phase-change material M is in contact with an outer peripheral surface of the pump part P.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat storage device using a phase change material and a hot water production device including the same.

  Conventionally, in order to produce hot water, a hot water production apparatus using waste heat, residual heat, geothermal heat, solar heat, thermal power, electric heat, or the like as a heat source has been used.

  In the above-described hot water producing apparatus, a method of directly heating a pipe or a hot water container by a heat source has been adopted in order to produce hot water. For this reason, when the power supply of the heat source is turned off, there is a problem that the temperature inside the hot water production device decreases due to heat radiation.

  In recent years, in order to solve such problems, a heat storage device for producing hot water using a phase change material called PCM (Phase Change Material) as a heat storage material has been developed.

  A phase change material is a material that stores thermal energy by utilizing the absorption and release of heat generated 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, changes into a liquid when melted by storing heat, and changes into a solid when the temperature falls below the melting point by releasing heat.

For example, Patent Literature 1 discloses a heat storage device using a heat storage material including a phase change material.
The heat storage device includes a housing, a heat storage material housed inside the housing, a flow path pipe through which the heat medium flows and is arranged so as to penetrate the housing, and a heat storage material inside and outside the housing. And a transfer device for transferring between them. Further, at a temperature near the melting point of the heat storage material, the transfer device collects graphite particles and SiC particles contained in the heat storage material outside the housing.
With such a configuration, even if a weather change such as a change in the amount of sunshine occurs, it is possible to suppress events such as voltage fluctuations and frequency fluctuations of the solar thermal power generation system, thereby enabling stable heat energy to be supplied. Become.

JP 2017-48265 A

  Here, the phase change material has a property of having a low thermal conductivity while having excellent heat storage properties. For this reason, when the size of the housing accommodating the phase change material is increased, it takes a long time until the central portion of the phase change material is completely dissolved.

  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 entire phase change material becomes solid. Therefore, it takes a long time again to re-dissolve the phase change material after restarting the heat storage device.

  The present invention has been made in view of the above situation, and an object of the present invention is to provide a heat storage device having improved heat storage efficiency by efficiently dissolving a phase change material, and a hot water production device including the same. I do.

In order to solve the above-described problems, the present invention includes a phase-change material container housing a phase-change material therein, a heater unit, and a pump unit,
The heater unit is provided on an outer peripheral surface of the phase change material container,
The pump unit, a pump body provided with a drive source, a suction port connected to the pump body to suction the phase change material, and a discharge port connected to the pump body to discharge the phase change material. , And
The phase change material is in contact with an 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 unit, the pump unit can suck and discharge the phase change material heated and melted by the heater unit. . Then, the discharged phase change material comes into contact with the undissolved phase change material, and the undissolved phase change material is dissolved. That is, by increasing the heat exchange area between the dissolved phase change material and the undissolved phase change material, the entire phase change material can be efficiently dissolved.

  In a preferred aspect of the present invention, the suction port is provided near a 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, and dissolves the entire phase change material. Efficiency is improved.

Further, the present invention provides a hot water production device including the heat storage device, a water storage device for storing water therein, and a pipe portion for transporting the water,
The piping unit is disposed inside the phase change material container and the water reservoir,
The phase change material is in contact with an outer peripheral surface of the pipe portion.

  With such a configuration, since the water passing through the pipe is heated by the dissolved phase change material, it is possible to efficiently produce hot water.

  In a preferred aspect of the present invention, the container for the phase change material and the water reservoir are provided adjacent to each other.

  With this configuration, the phase-change material container and the water reservoir exchange heat with each other, and it is possible to maintain high heat retention inside the water reservoir.

  In a preferred aspect of the present invention, the piping section is arranged so as to surround an outer periphery of the pump section.

  With such a configuration, the undissolved phase-change material inside the pump unit is dissolved by the warm water passing through the piping unit, and the driving source of the pump unit can be driven at an early stage. The discharge operation can be started smoothly.

  Advantageous Effects of Invention According to the present invention, it is possible to provide a heat storage device having an improved heat storage efficiency by efficiently dissolving a phase change material, and a hot water production device including the heat storage device.

It is a figure which shows the heat storage device which concerns on embodiment of this invention, Comprising: (a) It is a schematic perspective view, (b) It is an internal structure figure. 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. It is an outline perspective view showing the pump part in the regenerator concerning the embodiment of the present invention. FIG. 4 is an internal structural diagram of the heat storage device according to the embodiment of the present invention, showing a process in which the phase change material is dissolved. It is an outline perspective view of a warm water manufacturing device concerning an embodiment of the present invention. It is an internal structure figure of a warm water manufacturing device concerning an embodiment of the present invention.

Hereinafter, a heat storage device according to an embodiment of the present invention and a hot water production device including the same will be described with reference to FIGS.
The embodiment described below is an example of the present invention, and the present invention is not limited to the following embodiment. In these figures, reference numeral 1 denotes a heat storage device of the present embodiment, and reference numeral A denotes a hot water production device of the present embodiment.

As shown in FIG. 1, the heat storage device 1 includes a phase change material container CM in which a phase change material M is stored, a heater unit H1, and a pump unit P.
The phase change material M has two states, a solid undissolved phase change material MS and a liquid dissolved phase change material ML, depending on the heat storage temperature.

As shown in FIG. 1A, the phase change material container CM includes a substantially rectangular parallelepiped, bottomed cylindrical container body CM1, and a lid CM2 that covers the container body CM1 from above. . Further, the lid CM2 is provided with a control unit X for performing ON / OFF control for the heater unit H1 and operation control for the pump unit P.
Here, the user of the heat storage unit 1 can freely set the heat storage temperature of the melted phase change material ML in advance by the control unit X. When the heater unit H1 is turned on, the phase change material M Is melted, and the melted phase change material ML is heated to the set temperature. When the temperature of the melted phase change material ML reaches the set temperature, the heater unit 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 control unit X.

  As shown in FIG. 1B, the container body CM1 has a double structure, and includes an outer container CM11 formed on the outside and an inner container formed on the inside and containing the undissolved phase change material MS. The CM 12 is configured by forming a space RM in the gap and integrating the respective open ends. Then, the water W can be stored in the space RM.

The heater section H1 is formed in a cord shape, and is provided on the outer peripheral surface of the inner container CM12. The heater H1 has one end inserted into an insertion hole p provided in the container body CM1 and the lid CM2, and is electrically connected to the control unit X.
Note that the heater section H does not necessarily need to be in a cord shape, but may be in a plate shape or the like.

  The pump section P is mounted on the bottom surface of the inner container CM12, and is embedded inside the undissolved phase change material MS. That is, the undissolved phase change material MS is configured to be in contact with the outer peripheral surface of the pump section P.

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

As shown in FIG. 2A, the heater section H1 is provided on the side surface and the bottom surface of the inner container CM12.
More specifically, the heater portion H1 is spirally wound on the side surface of the inner container CM12, and provided on the bottom surface in a snake-like manner and adhered.
In addition, an adhesive member such as an aluminum tape or a known adhesive can be used as an adhesive means to the bottom surface of the heater section H1. Further, it is preferable that the heater portion H1 wound around the side surface is also adhered by an adhesive member such as an aluminum tape or a known adhesive. Further, a plurality of heater units H may be provided on the outer peripheral surface of the inner container CM12.

As shown in FIG. 3, the pump section P is entirely formed of a material having heat resistance, and includes a pump body P1 provided with a drive source (not shown) and a melting phase change connected to the pump 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 body P1, and a base P4 on which the pump body P1 is placed.
In addition, as a drive source, a DC24V or DC12V motor or the like is used.

More specifically, the pump section P has a substantially cylindrical suction pipe Pi in which a suction path Ri communicating with the suction port P2 is formed.
In FIG. 3, the hidden line of the suction path Ri is indicated by a dotted line.

  The pump unit P has bolts and other fixing devices (not shown) inserted through mounting holes z provided at four corners of the base P4, and is fixed to the bottom surface of the inner container CM12 via these fixing devices. Further, the pump section P is electrically connected to the control section X by a connection line (not shown) extending from the pump body P1.

  Hereinafter, a process in which the undissolved phase change material MS is dissolved will be described with reference to FIG.

  First, the user of the heat storage unit 1 operates the control unit X to increase the temperature of the heater unit H1.

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

  Then, as the dissolved phase change material ML existing near the side surface of the inner container CM12 accumulates at the bottom due to gravity, the bulk of the dissolved phase change material ML reaches the position of the suction port P2.

  Then, the user of the heat storage unit 1 operates the control unit X to operate the pump body P1 and start the suction / discharge operation by the pump unit P, thereby dissolving the phase change material ML by the pump unit P. Is performed (arrow a).

  Next, as shown in FIG. 4B, the sucked dissolved phase change material ML is discharged from the discharge port P3 (arrow b). As a result, the undissolved phase change material MS abutting on the discharge port P3 is dissolved by performing heat exchange with the dissolved phase change material ML, and becomes the dissolved phase change material ML.

  In this way, by dissolving from outside using the heater unit H1 and dissolving from inside using the pump unit P, as shown in FIG. 4C, the entire undissolved phase change material MS is efficiently dissolved. It can be a phase change material ML.

Hereinafter, the hot water manufacturing apparatus A including the heat storage device 1 will be described with reference to FIGS. 5 and 6.
In FIG. 6, the phase change material M, the phase change material container CM, the hot water container CW, the housing E, and the heating contacting the outer peripheral surface of the phase change material container CM and the outer peripheral surface of the hot water container CW. The heater sections H1 and H2 are shown in cross section. In FIG. 6, the phase change material M is shown as a state of the dissolved phase change material ML.

As shown in FIGS. 5 and 6, the hot water producing apparatus A includes a heat storage unit 1, a water storage unit 2 for storing water W therein, a piping unit 3 for suctioning, transporting, and discharging water W, and And a housing E for housing.
In addition, the housing E is omitted in FIG. 5 for convenience of explanation.

  The water reservoir 2 has a warm water container CW in which water W is stored, and a heater portion H2.

The hot water container CW, like the phase change material container CM, includes a substantially rectangular parallelepiped and bottomed cylindrical container body CW1, and a lid CW2 that covers the container body CW1 from above.
The container body CW1 has a double structure like the container body CM1, and includes an outer container CW11 formed on the outside and an inner container CW12 formed on the inside and containing water W. It is configured by forming the space RW in the gap and integrating the respective open ends.

  The heater portion H2 of the water reservoir 2 is formed in a cord shape, like the heater portion H2 of the regenerator 1, is spirally wound on the side surface of the inner container CW12, and has a bottom surface. , And are adhered by being laid in a snake shape.

  The phase change material container CM and the water reservoir 2 are provided adjacent to each other, and the piping unit 3 penetrates the respective lids CM2 and CW2 to be disposed inside the inner containers CM12 and CW12. Have been.

More specifically, the pipe section 3 includes a first pipe 31 that is disposed in a substantially serpentine shape inside the inner container CM12, a side wall and a bottom surface inside the inner container CM12, and the pump section P. It is constituted by a second pipe 32 arranged to be curved so as to surround the periphery, and a third pipe 33 arranged only inside the inner container CW12.
The number of pipes is not limited to three, but may be any number.

  The outer peripheral surfaces of the first pipe 31 and the second pipe 32 arranged inside the inner container CM12 are configured to be in contact with the melted phase change material ML.

Each of the pipes 31, 32, and 33 is provided with a pipe pump 31P, 32P, and 33P for sucking the water W contained in the inner container CW12 and the water W supplied from the outside.
The pumps 31P, 32P, and 33P are provided with a drive source similarly to the pump unit P, and are electrically connected to the control unit X by connection lines (not shown) extending therefrom.

As illustrated in FIG. 6, the housing E includes a substantially rectangular parallelepiped, bottomed cylindrical housing body E1 and a lid E2 that covers the housing body E1 from above.
Further, on the inner wall of the housing body E1, a control unit X for controlling the temperature of the heater units H1 and H2 and controlling the operation of the pump unit P is provided.
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 storage unit 1 is inserted into an insertion hole p provided in the container body CM1 and the lid CM2, and is electrically connected to the control unit X.
One end of the heater portion H2 of the water reservoir 2 is inserted into an insertion hole p provided in the container body CW1 and the lid CW2, and is electrically connected to the control portion X.

  Here, the user of the hot water producing apparatus A can freely set the temperature of the hot water in advance by the control unit X. When the heaters H1 and H2 are turned ON, the temperature of the hot water is reduced to 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 control unit 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 accommodated in the inner container CW12. Further, a valve V is provided in a portion exposed to the outside of the first pipe 31. Further, an opening end 31c for sucking water W is provided in a portion of the first pipe 31 arranged inside the inner container CW12.
One end 31a is connected to, for example, a water pipe for supplying tap water.

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

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

When producing the hot water, the user of the hot water producing apparatus A operates the piping pump 31P using the control unit X. Thereby, the first pipe 31 sucks the water W stored in the inner container CW12 from the open end 31c (arrow c).
Then, when the sucked water W passes through the first pipe 31 arranged inside the inner container CM12, it is heated by the dissolved phase change material ML to become hot water, and is discharged from the other end 31b into the inner container CW12. And supplied (arrow d).

Further, for example, when the user turns off the power of the hot water producing apparatus A for a long time and the entire phase change material M is in the state of the undissolved phase change material MS, the pump unit P is quickly operated. To this end, the control unit X is used to operate the piping pump 32P. As a result, the second pipe 32 sucks the water W stored in the inner container CW12 from one end 32a (arrow e), and moves the portion of the second pipe 32 that is arranged to surround the outer periphery of the pump portion P. Then, the water W is discharged from the other end 32b (arrow f).
At this time, if the water W stored in the inner container CW12 is warm water through the first pipe 31, when the water W passes through a portion arranged to surround the outer periphery of the pump portion P, The undissolved phase change material MS can be dissolved, and the drive source of the pump unit P can be driven early.

  When supplying the water W supplied into the water reservoir 2 to the outside, the user operates the piping pump 33P using the control unit X. Thereby, the third pipe 33 sucks the heated water W which has become hot water from the other end 33b (arrow g), discharges it from the one end 33a to the outside, and supplies it (arrow h).

When supplying the water W into the water reservoir 2, the user opens the flow path of the pipe 31 using the valve V, and operates the pipe pump 31 </ b> P using the control unit X. Thereby, the first pipe 31 sucks the external water W from one end 31a (arrow i).
Then, when the sucked water W passes through the first pipe 31 arranged inside the inner container CM12, it is heated by the dissolved phase change material ML to become hot water, and is discharged from the other end 31b into the inner container CW12. And supplied (arrow d).

  In this way, even while the suction / discharge operation of the water W is being performed by the pipe unit 3, the user can naturally control the heater unit of the pump unit P and the heat storage unit 1 by the control unit X. H1 can be operated. Thereby, when the phase change material M is in the state of the undissolved phase change material MS, the dissolution efficiency is improved, and when the phase change material M 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 even if the pump unit P and the heater unit H1 of the heat storage unit 1 are not operated. Only by operating the pipe section 3, it is possible to supply hot water to the outside for a predetermined time. That is, according to the hot water production device A, the energy efficiency when supplying the hot water to the outside is improved.

  According to this embodiment, since the suction port P2 is provided near the bottom surface of the phase change material container CM, the amount of the dissolved phase change material ML sucked into the suction port P2 increases, and the undissolved phase change material ML is undissolved. The dissolution efficiency of the entire phase change material MS is improved.

  In addition, the pump section P discharges and stirs the dissolved phase change material ML from the discharge port P3, whereby heat exchange can be performed, and the dissolving efficiency of the entire undissolved phase change material MS is improved.

  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 that hot water is efficiently produced. It is possible to do.

  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 perform heat exchange with each other, and the inside of the water reservoir 2 is high. Heat retention can be maintained.

  Further, since the second pipe 32 is disposed so as to surround the outer periphery of the pump section P, the undissolved phase change material MS inside the pump section P is dissolved by hot water passing through the second pipe 32, The drive source of the unit P can be driven at an early stage, and the suction / discharge operation of the pump unit P can be started smoothly.

  Note that the shapes, dimensions, and the like of each component shown in the above-described embodiment are merely examples, and can be variously changed based on design requirements and the like.

A Hot water production device 1 Regenerator CM Phase change material container CM1 Container body CM11 Outer container CM12 Inner vessel CM2 Lid RM Space P Pump unit P1 Pump body P2 Suction port P3 Discharge port P4 Base z Mounting hole 2 Water reservoir CW Hot water Container CW1 Container main body CW11 Outer container CW12 Inner container CW2 Cover RW Space H1, H2 Heater unit p Insertion hole 3 Piping unit 31 First piping 32 Second piping 33 Third piping 31P, 32P, 33P Piping pump V valve E housing E1 housing body E2 lid X control unit W water M phase change material MS undissolved phase change material ML dissolved phase change material

Claims (5)

A phase-change material container that contains a phase-change material inside, a heater unit, and a pump unit,
The heater unit is provided on an outer peripheral surface of the phase change material container,
The pump unit, a pump body provided with a drive source, a suction port connected to the pump body to suction the phase change material, and a discharge port connected to the pump body to discharge the phase change material. , And
The heat storage device, wherein the phase change material is in contact with an outer peripheral surface of the pump unit.   The heat accumulator according to claim 1, wherein the suction port is provided near a bottom surface of the phase change material container. A hot water production device comprising: the heat storage device according to claim 1 or 2; a water storage device that stores water therein; and a piping unit that transports the water.
The piping unit is disposed inside the phase change material container and the water reservoir,
The hot water producing apparatus according to claim 1, wherein the phase change material is in contact with an outer peripheral surface of the pipe.   The hot water production apparatus according to claim 3, wherein the phase change material container and the water reservoir are provided adjacent to each other. 5. The hot water production device according to claim 3, wherein the piping unit is disposed so as to surround an outer periphery of the pump unit. 6.