JP2020128852A - Heat storage device and heat storage heating device - Google Patents

Abstract

To provide a heat storage device and a heat storage heating device capable of finely maintaining both of heat exchange characteristics and heat storage performance by a simple structure.SOLUTION: A heat storage device includes piping 10 that forms a channel of cooling water W, and a heat storage body 2 that is formed by high elastic solid and solid phase transition heat storage material as compared with the piping 10, and is formed with a plurality of channels 3 of the cooling water W. The heat storage body 2 is pressed in the piping 10. The piping 10 is formed with a recessed portion 11 engaging with the heat storage body 2 at an inner wall part in which the storage body 2 is inserted. Furthermore, in the heat storage body 2, the solid and solid phase transition heat storage material is mixed in a resinous base material. A heat conductive member is mixed in the heat storage body 2.SELECTED DRAWING: Figure 1

Description

The present invention relates to a heat storage device and a heat storage heating device having heat exchange characteristics and heat storage performance.

Many heat storage heating devices use latent heat stored by a heat storage material (solid-liquid phase change heat storage material) that causes a phase change between a solid phase and a liquid phase in a heat storage temperature range. Patent Documents 1 and 2 describe a heat storage system or a heat storage heating device in which the solid-liquid phase change heat storage material is combined with a solid heat storage material using sensible heat.

JP, 2011-144961, A JP, 2016-011787, A

However, since the solid-liquid phase change heat storage material is in a liquid phase state, a casing enclosing the solid-liquid phase change heat storage material is required. On the other hand, in order to improve the heat exchange characteristics with the solid-liquid phase change heat storage material, it is necessary to increase the surface area of the solid-liquid phase change heat storage material. Must be formed.

If it is attempted to satisfy both the necessity of this casing and the improvement of heat exchange characteristics, the structure of the solid-liquid phase change heat storage material becomes complicated and the volume of the solid-liquid phase change heat storage material decreases, so the heat storage performance deteriorates. There was a problem. Particularly, when the structure of the casing becomes complicated, it becomes difficult to secure a seal when the solid-liquid phase change heat storage material in the casing is in a liquid phase state.

The present invention has been made in view of the above, and an object thereof is to provide a heat storage device and a heat storage heating device that have a simple configuration and can favorably maintain both heat exchange characteristics and heat storage performance. ..

In order to solve the above-mentioned problems and achieve the object, a heat storage device according to the present invention is formed by a pipe forming a flow path of a heat medium and a solid-solid phase transition heat storage material having a higher elasticity than the pipe. And a heat storage body having a plurality of flow paths for the heat medium formed therein, the heat storage body being press-fitted into the pipe.

Further, the heat storage device according to the present invention is characterized in that, in the above-mentioned invention, the pipe is formed with a concave portion for engaging the heat storage body in an inner wall portion into which the heat storage body is inserted.

Further, the heat storage device according to the present invention is characterized in that, in the above-mentioned invention, an end portion of the heat storage body has at least a connection pipe abutting the end portion of the heat storage body inserted from both end sides of the pipe. To do.

Further, the heat storage device according to the present invention is characterized in that, in the above-mentioned invention, the heat storage body is a resin base material mixed with a solid-solid phase transition heat storage material.

Further, the heat storage device according to the present invention is characterized in that, in the above-mentioned invention, a heat conductive member is mixed in the heat storage body.

Further, in the heat storage device according to the present invention, in the above invention, the heat medium is cooling water, and the phase transition temperature of the solid-solid phase transition heat storage material is higher than the predetermined temperature from the predetermined temperature. It is characterized by being up to the boiling point.

Further, the heat storage heating apparatus according to the present invention is a heat storage heating apparatus that warms the inside of the moving body with a heater by utilizing the heat of the heat medium, and sends out the heat medium from at least the engine of the moving body to the heater. The heat storage device according to any one of the above inventions is interposed in a part of the pipe.

According to the present invention, both the heat exchange characteristics and the heat storage performance can be favorably maintained with a simple configuration.

FIG. 1 is a cross-sectional view that schematically shows the configuration of a heat storage device that is an embodiment of the present invention. FIG. 2 is a cross-sectional view of the heat storage device shown in FIG. 1 taken along the line AA. FIG. 3 is a diagram showing heat absorption characteristics and heat radiation characteristics associated with the phase transition of the solid-solid phase transition heat storage material. FIG. 4 is a sectional view schematically showing the configuration of the heat storage device of Modification 1 of the embodiment of the present invention. FIG. 5: is a schematic diagram which shows the general|schematic structure of the thermal storage heating apparatus of this modification 2. As shown in FIG.

Embodiments for carrying out the present invention will be described below with reference to the accompanying drawings.

<Structure of heat storage device>
FIG. 1 is a sectional view schematically showing a configuration of a heat storage device 1 according to an embodiment of the present invention. 2 is a cross-sectional view taken along the line AA of the heat storage device 1 shown in FIG. As shown in FIGS. 1 and 2, in the heat storage device 1, a heat storage body 2 is arranged in a pipe 10. A flow path of cooling water W as a heat medium is formed in the pipe 10, and the cooling water W flows in from the inlet pipe 10a and flows out from the outlet pipe 10b. The heat storage body 2 is formed of a solid-solid phase transition heat storage material having a higher elasticity than the pipe 10, and a plurality of flow paths of the cooling water W are formed. Here, the pipe 10 has a cylindrical shape, the heat storage body 2 has a cylindrical shape, and a plurality of flow paths 3 are formed therein. The flow path 3 is a cylindrical space. The shapes of the pipe 10 and the heat storage body 2 are not limited to this, and the pipe 10 may be tubular and the heat storage body 2 may be tubular.

The heat storage body 2 is press-fitted into the pipe 10. The pipe 10 is provided with a concave portion 11 in which a cylindrical side surface of the heat storage body 2 is engaged with an inner wall portion into which the heat storage body 2 is inserted. Since the heat storage body 2 has higher elasticity than the pipe 10, the heat storage body 2 side is elastically deformed at the time of press fitting and is easily inserted into the pipe 10. The recess 11 may not be provided, and the heat storage body 2 may be fixedly arranged in the pipe 10 only by press fitting.

The heat storage body 2 may be formed of only the solid-solid phase transition heat storage material, but the solid-solid phase transition heat storage material is mixed into the resin base material that elastically deforms.

Further, the heat storage member 2 may be mixed with a heat conductive member. In this case, the solid-solid phase transition heat storage material and the heat conductive member are mixed in the resin base material as fillers (fillers), respectively.

The solid-solid phase transition heat storage material changes to a solid first phase state when the temperature is equal to or lower than the phase transition temperature, and changes to a solid second phase state when the temperature exceeds the phase transition temperature. Then, as shown in FIG. 3, the solid-solid phase-transition heat storage material absorbs heat during a phase change at a phase transition temperature (eg, around 65° C.) when heated, and conversely, when cooled, the phase transition. Dissipates heat when the phase changes with temperature.

The solid-solid phase transition heat storage material is a strong interphase electron-based compound, and is, for example, vanadium dioxide (VO ₂ ) or vanadium oxide obtained by doping VO ₂ with W, Re, Ru, Nb, Ta or the like.

The resin base material is a polymer alloy having excellent weather resistance, cooling liquid resistance, and heat resistance. The polymer alloy is silicone, urethane, epoxy, acrylic, olefin, phenol, polyimide, rubber-based EPDM, 1-4 trans polybutanediene, or the like.

The heat conductive member is provided to ensure the heat conductivity between the cooling water W and the scattered solid-solid phase transition heat storage material, and for example, aluminum oxide, aluminum hydroxide, magnesium oxide, Examples thereof include silicon oxide, silicon carbide, zinc oxide, boron nitride, aluminum nitride, silicon nitride, silicon carbide and diamond.

In the present embodiment, the phase transition temperature of the solid-solid phase transition heat storage material is 65° C., but the phase transition may be at a predetermined temperature, for example, 40° C. to the boiling point of the cooling water W. The phase transition temperature can be changed by the mixing ratio of the solid/solid phase transition heat storage material, the heat conductive member, and the resin base material.

A specific resin base material is a silicone-based polymer alloy, and is 70% by weight with respect to the heat storage body 2. The solid-solid phase transition heat storage material is VO ₂ , and is 25% by weight with respect to the heat storage body 2. The heat conductive member is boron nitride, and is 5% by weight with respect to the heat storage body 2. With such a composition, the heat storage body 2 has a heat storage density of 65 J/cc, a heat storage temperature of 65° C., a thermal conductivity of 1.6 W/mK, a specific heat of 1.4 J/gK, and a density of 1.9 g/cm ^3. Exhibit the characteristics of.

In the heat storage device 1, when the temperature of the cooling water W flowing into the pipe 10 is higher than the phase transition temperature, the solid-solid phase transition heat storage material in the heat storage body 2 absorbs heat from the cooling water W and stores heat. On the other hand, when the temperature of the cooling water W flowing into the pipe 10 becomes lower than the phase transition temperature, the solid-solid phase transition heat storage material in the heat storage body 2 radiates heat to the cooling water W.

In the present embodiment, the heat storage body 2 in which a plurality of flow paths are formed has the heat storage performance of the solid/solid phase transition heat storage material, and the solid/solid phase transition heat storage material is mixed in the resin base material. It can be easily manufactured by injection molding or the like, and it is not necessary to provide sealing performance when using a solid-liquid phase change heat storage material. Further, since the heat storage body 2 has a higher elasticity than the pipe 10, the heat storage body 2 can be easily attached to the pipe 10 and the heat storage device 1 can be easily manufactured.

<Modification 1>
FIG. 4 is a sectional view schematically showing the configuration of the heat storage device 1 according to the first modification. As shown in FIG. 4, in the heat storage device 1 of the present modified example, the connection pipes 30 and 31 in which the end of the heat storage body 2 abuts at least the end of the heat storage body 2 are inserted from both end sides of the pipe 20. .. That is, the pipe 20 does not have the concave portion 11 on the inner wall thereof, and the inner diameter of the end portions 20a and 20b where the heat storage body 2 is not arranged is made larger than the outer diameter of the heat storage body 2, and the connection pipes are connected to the end portions 20a and 20b, respectively. The end portions of 30 and 31 are inserted inside so that they come into contact with the end portions of the heat storage body 2.

Thereby, the arrangement position of the heat storage body 2 in the pipe 20 is fixed by the connection pipes 30 and 31. Although the inner diameters of the end portions 20a and 20b are larger than the outer diameter of the heat storage body 2 in FIG. 4, the inner diameters of the end portions 20a and 20b may be the same as the outer diameter of the heat storage body 2. That is, the inner diameters of the pipes 20 may all be the same. Even in this case, the ends of the connection pipes 30 and 31 need to contact the ends of the heat storage body 2.

In the configuration of the first modification, the heat storage body 2 is not press-fitted into the pipe 10 but simply inserted, and the arrangement position of the heat storage body 2 is positioned and fixed by the connection pipes 30 and 31. The manufacture of the device 1 is facilitated.

<Modification 2>
Next, the heat storage heating device 101 of the second modification will be described. FIG. 5: is a schematic diagram which shows the schematic structure of the thermal storage heating apparatus 101 of this modification 2. As shown in FIG. The heat storage heating device 101 is a device that heats the exhaust heat of the engine 103 to heat the inside of the vehicle, and shows an example applied to an idling stop vehicle, a hybrid vehicle, and the like.

As shown in FIG. 5, the heat storage heating device 101 includes a radiator 102, an engine 103, a heater 104, and a piping system L. A vehicle equipped with the engine 103 uses the cooling water W to cool the engine 103. Further, the vehicle equipped with the engine 103 includes a heater 104 that heats the inside of the vehicle by using the cooling water W heated by the heat generation of the engine 103. Here, the heat storage device 1 is arranged in a part of the pipe L4 (the delivery pipe for delivering the cooling water W) that forms the flow path of the cooling water W led out from the engine 103, and the heated cooling water W is stored in the heat storage body. When the temperature exceeds the phase transition temperature of 2, the heat energy is stored in the heat storage body 2 by absorbing heat from the cooling water W, and when the cooling water W is cooled and becomes equal to or lower than the phase transition temperature of the heat storage body 2, the heat storage body The heat energy stored in 2 is released to the cooling water W, and the heated cooling water W is used to warm the interior of the vehicle by the heater 104. As a result, the heat storage device 1 on the pipe L4 stores heat when the engine 103 is operating in steady operation, and radiates heat when the engine is not operating due to idling stop or the like to warm the interior of the vehicle by the heater 104. it can.

The radiator 102 cools the cooling water W that has flowed in via the pipe L12, and guides it to the flow rate flow control valve 105 via the pipe L1. The flow passage adjustment valve 105 guides the introduced cooling water W to the pump 106 side via the pipe L2. A pipe L11 that bypasses the returned cooling water W without passing through the radiator 102 is also connected to the flow rate flow control valve 105. The flow passage control valve 105 is, for example, a thermostat valve. When the introduced cooling water W exceeds a certain temperature, the pipe L1 side is opened, the cooling water W is cooled by the radiator 102, and the introduced cooling water is supplied. When W is equal to or lower than a certain temperature, the pipe L11 side is closed, the cooling water W is led to the pump 106 side without cooling the cooling water W by the radiator 102, and the warm-up operation is performed. Strictly speaking, the flow rate flow control valve 105 adjusts the opening of the pipe on the radiator 102 side and the opening of the pipe bypassing the radiator 102 according to the temperature. The cooling water W is an example of a heat medium that is a fluid for moving heat to cool the engine that is the heat source.

The pump 106 pumps the introduced cooling water W to the engine 103 side via the pipe L3. The cooling water W heated by the engine 103 is led out to the heater 104 side via the pipe L4. In addition, the cooling water W heated by the engine 103 is returned to the radiator 102 side or the flow rate flow control valve 105 side via the pipe L10 branched from the pipe L4. The pipe L10 is branched and connected to a pipe L12 and a pipe L11.

The pipe L4 is connected to the pipe L7 via the opening/closing valve 107. The heat storage device 1 is inserted into the pipe L4. The cooling water W passing through the pipe L7 is introduced into the heater 104 which is a heat exchanger. Further, the heat of the cooling water W introduced into the heater 104 is heat-exchanged by the heater 104 and is released into the vehicle. The cooling water W that has undergone heat exchange by the heater 104 is led to the pipe L2 via the pipe L8, the on-off valve 108, and the pipe L6. A pipe L5 that bypasses the cooling water W is provided between the on-off valves 107 and 108. When heating the heater 104, the opening/closing valve 107 opens the pipe L7 side, and the opening/closing valve 108 opens the pipe L8 side to guide the cooling water W to the heater 104. On the other hand, when the heat storage device 1 maintains heat storage without heating the heater 104, the opening/closing valve 107 opens the pipe L5 side and the opening/closing valve 108 opens the pipe L5 side. By doing so, the cooling water W is bypassed to the pipe L5 without being led to the heater 104 side.

The controller 110 controls opening/closing of the opening/closing valves 107 and 108. Under the control of the controller 110, the normal heating mode and the heat storage circulation mode are switched. In the normal heating mode, the cooling water W flows through the heating circulation flow path RB via the heater 104 without passing through the pipe L5. In the heat storage circulation mode, the cooling water flows through the heat storage circulation flow path RA via the pipe L5 without passing through the heater 104. In particular, when the engine 103 shifts to the steady operation after the warm-up operation, the controller 110 opens the pipe L5 side of the on-off valves 107 and 108, and the pipe L4 is supplied with the heated cooling water W. A heat storage circulation mode for storing heat in the pipe L4 by absorbing heat is executed.

In addition, when the pipe L5 is provided, it is preferable to insert the heat storage device 1 also in the pipe L6. As a result, the heat storage amount can be further increased. Moreover, the cooling water W is an example of a thermal refrigerant, and the cooling water W may contain an antifreezing agent. The cooling water W containing the antifreezing agent has a boiling point higher than that of water. Further, the heater 104 is provided with a blower fan (not shown), and the blower fan is driven during heating so that warm air flows in the vehicle.

In the configuration of the second modification, the heat storage device 1 stores heat when the engine 103 is operating in steady operation, and radiates heat when the engine 103 is not operating due to idling stop or the like to warm the interior of the vehicle by the heater 104. Therefore, the exhaust heat of the engine 103 can be effectively utilized in a timely manner to improve energy efficiency.

Although the embodiment and the modified example to which the invention made by the present inventors is applied have been described above, the present invention is not limited by the description and the drawings which form part of the disclosure of the present invention according to the present embodiment. Absent. That is, all other embodiments, examples, operation techniques and the like made by those skilled in the art based on the present embodiment are included in the scope of the present invention.

1 Heat Storage Device 2 Heat Storage Body 3 Flow Paths 10, 20, L1 to L8, L10 to L12 Piping 10a Inlet Piping 10b Outlet Piping 11 Recesses 20a, 20b Ends 30, 31 Connection Piping 101 Heat Storage Heating Device 102 Radiator 103 Engine 104 Heater 105 Flow rate control valve 106 Pumps 107, 108 Open/close valve 110 Controller L Piping system RA Heat storage circulation flow path RB Heating circulation flow path W Cooling water

Claims (7)

Piping for forming the flow path of the heat medium,
A heat storage body formed of a solid-solid phase transition heat storage material having a higher elasticity than the pipe, and a plurality of flow paths of the heat medium are formed,
The heat storage device is characterized in that the heat storage body is press-fitted into the pipe. The heat storage device according to claim 1, wherein the pipe has a recess formed in an inner wall portion in which the heat storage body is inserted, the recess being engaged with the heat storage body. The heat storage device according to claim 1, wherein at least an end portion of the heat storage body has a connection pipe that is in contact with at least an end portion of the heat storage body and is inserted from both end sides of the pipe. The heat storage device according to any one of claims 1 to 3, wherein the heat storage body has a resin-made base material mixed with a solid-solid phase transition heat storage material. The heat storage device according to any one of claims 1 to 4, wherein the heat storage member is mixed with a heat conductive member. The heat medium is cooling water,
The phase transition temperature of the solid-solid phase transition heat storage material is between a predetermined temperature and a boiling point of the cooling water that is higher than the predetermined temperature, according to any one of claims 1 to 5. Heat storage device. A heat storage heating device for warming the inside of a moving body by a heater using the heat of the heat medium,
A heat storage heating device, wherein the heat storage device according to any one of claims 1 to 6 is interposed in at least a part of a delivery pipe that delivers the heat medium from the engine of the moving body to the heater. ..

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