JP2010181087A - Method of discharging latent heat storage material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of discharging a latent heat storage material for discharging the latent heat storage material within a heat storage tank in the reusable state. <P>SOLUTION: In the method of discharging the latent heat storage material 12 for discharging the latent heat storage material 12 performing heat storage and heat release by using heat absorbed/emitted during phase change between a solid phase and a liquid phase from the heat storage tank 4, the latent heat storage material 12 within the heat storage tank 4 is molten, and the molten latent heat storage material 12 is input to an input port 23 of a cooling kneading device 22 connected to the heat storage tank 4. The cooling kneading device 22 cools and kneads the latent heat storage material 12 while transferring it from the input port 23 side to a discharge port 24 side, and the latent heat storage material 12 which becomes a powdery state by the cooling and kneading is continuously discharged from the discharge port 24. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method of discharging from a heat storage tank a latent heat storage material that performs heat storage and heat dissipation using heat absorbed and released when a phase change occurs between a solid phase and a liquid phase.

  Waste heat generated in heat source facilities (for example, power plants, waste incinerators, steelworks, chemical plants) is effectively discarded in heat utilization facilities (for example, office buildings, hospitals, hotels, and Kurhaus). There is known a heat transfer system that stores heat in a heat storage tank, transports the heat storage tank to a heat utilization facility, and performs hot water supply, air conditioning, etc. using the heat storage tank as a heat source (Patent Document 1, 2).

  In such a heat transfer system, a latent heat storage material (for example, erythritol, mannitol, magnesium chloride hexahydrate, sodium acetate trihydrate, etc.) is accommodated in a heat storage tank, and the latent heat storage material is in a solid phase. Heat is stored and released using the heat absorbed and released when the phase changes between the liquid phases. Here, the latent heat storage material absorbs heat from the surroundings when the phase changes from the solid phase to the liquid phase, and releases heat when the phase changes from the liquid phase to the solid phase. Moreover, since the temperature of the latent heat storage material does not change when the phase changes between the solid phase and the liquid phase, it is possible to radiate heat at a constant temperature.

JP 2008-241107 A JP 2008-309344 A

  By the way, the heat storage tank needs to periodically maintain the piping and instruments provided therein, and at this time, in order to be able to perform work in the heat storage tank, the latent heat in the heat storage tank It is necessary to discharge the heat storage material once.

  Here, as a method of discharging the latent heat storage material from the heat storage tank, after the latent heat storage material in the heat storage tank is melted, the latent heat storage material is dissolved and discharged in the water charged into the heat storage tank, or Conventionally, a method of discharging the latent heat storage material melted in the heat storage tank as it is and receiving it in a container such as a drum can has been adopted.

  However, when the latent heat storage material in the heat storage tank is dissolved in water and discharged, the latent heat storage material once dissolved in water cannot be reused and must be discarded, and a large amount of latent heat storage material (10 ˜20t) is wasted. Moreover, there is a possibility that the temperature of the latent heat storage material in the heat storage tank exceeds the boiling point of water, and there is a risk that the added water will boil.

  In addition, when the latent heat storage material melted in the heat storage tank is discharged as it is and received in a container such as a drum can, the container and the latent heat storage material are integrated when the latent heat storage material solidifies in the container. It becomes difficult to take out the heat storage material. Even if the latent heat storage material was taken out from the container, the extracted latent heat storage material was in a large lump, and it was difficult to return the latent heat storage material into the heat storage tank.

  The problem to be solved by the present invention is to provide a method for discharging a latent heat storage material capable of discharging the latent heat storage material in the heat storage tank in a reusable state.

  In order to solve the above problems, the latent heat storage material in the heat storage tank is melted, and the molten latent heat storage material is charged into the inlet of the cooling kneading device connected to the heat storage tank. The latent heat storage material was cooled and kneaded while transferring the material from the inlet side to the outlet side, and the latent heat storage material in powder form by the cooling and kneading was continuously discharged from the outlet.

  If it does in this way, since it discharges without adding water to the latent heat storage material in a thermal storage tank, it is possible to reuse the discharged latent heat storage material. Moreover, since the latent heat storage material discharged from the heat storage tank is in a powder state, the operation of returning the latent heat storage material into the heat storage tank is easy.

  The cooling and kneading apparatus includes, for example, a casing having an inlet and an outlet for a latent heat storage material, and two screw shafts arranged horizontally in the casing. A jacket for forming a space through which a coolant for cooling flows is provided, and each of the screw shafts includes a rotating shaft that rotates in opposite directions and a helical screw blade provided on an outer periphery of the rotating shaft. The screw blades are formed so that the screw blades of each screw shaft mesh with the screw blades of the other screw shaft, and the screw blades knead while transferring the latent heat storage material in the casing from the inlet side to the outlet side. Can be used.

  This cooling and kneading apparatus can enhance the cooling performance of the latent heat storage material when the refrigerant passage is formed inside the screw blade. In addition, if a cutout part having a shape in which a part of the circumference is cut out is provided on the outer periphery of the screw blade, the latent heat storage material in the casing is fed and moved in the circumferential direction by the cutout part. The kneading performance can be improved.

  The cooling kneader includes, for example, a casing having an inlet and an outlet for a latent heat storage material, and two rotating shafts disposed horizontally in the casing, A jacket for forming a space through which a coolant for cooling the casing flows, and a screw for transferring the latent heat storage material in the casing from the inlet side to the outlet side on the outer periphery of each rotating shaft, and latent heat in the casing A large number of kneading paddles for kneading the heat storage material are assembled, and the kneading paddle is formed so that the outer periphery of the kneading paddle of each rotating shaft scrapes off the latent heat storage material attached to the outer periphery of the kneading paddle of the other rotating shaft. You can use what you have.

  In this cooling and kneading apparatus, a refrigerant passage may be formed inside the rotating shaft. If it does in this way, the cooling performance of the latent heat storage material in a casing can be raised more.

  When the method for discharging a latent heat storage material of the present invention is used, the latent heat storage material in the heat storage tank is discharged without adding water, so that the discharged latent heat storage material can be reused. Moreover, since the discharged latent heat storage material is in a powder state, it is easy to return the latent heat storage material into the heat storage tank.

Diagram showing heat transfer system using heat storage tank Sectional view of the heat storage tank shown in FIG. Sectional drawing which shows the process in which a latent heat storage material is discharged | emitted from the heat storage tank shown in FIG. 2 using the discharge method of the latent heat storage material of 1st Embodiment of this invention. Expanded sectional view along line IV-IV in FIG. FIG. 3 is an enlarged sectional view of the screw shaft shown in FIG. Sectional drawing which shows the process in which a latent heat storage material is discharged | emitted from the heat storage tank shown in FIG. 2 using the discharge method of the latent heat storage material of 2nd Embodiment of this invention. FIG. 6 is an enlarged sectional view taken along line VII-VII. FIG. 7 is an enlarged sectional view showing a modification of the cooling and kneading apparatus shown in FIG.

  Hereinafter, after explaining the heat transfer system shown in FIG. 1, a method for discharging a latent heat storage material according to an embodiment of the present invention will be described. The heat transfer system shown in FIG. 1 is a heat utilization facility 2 (for example, an office building) separated from the heat source facility 1 from waste heat generated in the heat source facility 1 (for example, a power plant, a waste incineration plant, a steel mill, or a chemical plant). , Hospitals, hotels, Kurhaus).

  This heat transfer system includes, on the heat source facility 1 side, a waste heat pipe 3 through which a waste heat medium (for example, hot water or steam) generated in the heat source facility 1 flows, a heat medium pipe 5 that is detachably connected to the heat storage tank 4, and waste A heat exchanger 6 for exchanging heat between the heat pipe 3 and the heat medium pipe 5 is provided. By operating the circulation pump 7 with the heat storage tank 4 connected to the heat medium pipe 5, the heat medium pipe The heat transfer oil in 5 can be circulated between the heat storage tank 4 and the heat exchanger 6. At this time, heat is transferred from the waste heat medium flowing through the waste heat pipe 3 to the heat medium oil flowing through the heat medium pipe 5, and the heat of the heat medium oil is stored in the heat storage tank 4.

  Moreover, this heat transfer system includes a heat utilization pipe 8 through which a heat utilization medium (for example, heating water or hot water supply water) flows on the heat utilization facility 2 side, and a heat medium pipe 9 detachably connected to the heat storage tank 4; A heat exchanger 10 for exchanging heat between the heat utilization pipe 8 and the heat medium pipe 9 is provided. By operating the circulation pump 11 with the heat storage tank 4 connected to the heat medium pipe 9, The heat transfer oil in the medium pipe 9 can be circulated between the heat storage tank 4 and the heat exchanger 10. At this time, heat is transmitted from the heat medium oil flowing through the heat medium pipe 9 to the hot water supply water and heating water flowing through the heat utilization pipe 8, and the heat utilization facility 2 performs hot water supply and air conditioning.

  As described above, this heat transfer system uses waste heat of the heat source facility 1 as heat energy of the heat utilization facility 2 by moving the heat storage tank 4 back and forth between the heat source facility 1 and the heat utilization facility 2.

  As shown in FIG. 2, a latent heat storage material 12 and a heat transfer oil 13 having a specific gravity smaller than that of the latent heat storage material 12 are accommodated in the heat storage tank 4. The latent heat storage material 12 and the heat medium oil 13 are separated into two upper and lower layers by the difference in specific gravity to form a heat medium oil layer 14 and a latent heat storage material layer 15.

  The latent heat storage material 12 absorbs heat from the surroundings when the phase changes from the solid phase to the liquid phase, and releases heat when the phase changes from the liquid phase to the solid phase. As such latent heat storage material 12, for example, erythritol, mannitol, magnesium chloride hexahydrate, sodium acetate trihydrate and the like can be used.

  The heat storage tank 4 is provided with a discharge pipe 16 for discharging the heat medium oil 13 into the latent heat storage material layer 15 and a recovery pipe 17 for recovering the heat medium oil 13 from the heat medium oil layer 14. The discharge pipe 16 is disposed so as to extend horizontally in the latent heat storage material layer 15, and a number of discharge ports 18 opening downward are formed at intervals in the longitudinal direction. The recovery pipes 17 are arranged so as to extend horizontally in the heat transfer oil layer 14, and a number of suction ports 19 that open upward are formed at intervals in the longitudinal direction.

  A discharge pipe 20 that communicates the inside and outside of the heat storage tank 4 is provided at the bottom of the heat storage tank 4, and the latent heat storage in the heat storage tank 4 is achieved by opening the discharge valve 21 attached to the discharge pipe 20. The material 12 can be discharged to the outside of the heat storage tank 4.

  When the heat storage tank 4 is radiated, the heat medium pipe 9 of the heat utilization facility 2 is connected to the discharge pipe 16 and the recovery pipe 17 as shown in the lower side of FIG. The heat transfer oil 13 is circulated between the heat storage tank 4 and the heat exchanger 10.

  At this time, the low-temperature heat medium oil 13 sent from the heat medium pipe 9 into the discharge pipe 16 is discharged from the discharge pipe 16 into the latent heat storage material layer 15, and the heat medium oil 13 is connected to the latent heat storage material 12. The latent heat storage material layer 15 is raised by the specific gravity difference. In this ascending process, the low-temperature heat transfer oil 13 is in direct contact with the latent heat storage material 12, so that the latent heat storage material 12 in the heat storage tank 4 changes its phase from a liquid phase to a solid phase and dissipates heat.

  On the other hand, when the heat storage tank 4 is subjected to a heat storage operation, as shown in the upper side of FIG. 1, the heat medium pipe 5 of the heat source facility 1 is connected to the discharge pipe 16 and the recovery pipe 17 and the circulation pump 7 is operated in this state. The heat transfer oil 13 is circulated between the heat storage tank 4 and the heat exchanger 6.

  At this time, the high-temperature heat medium oil 13 sent from the heat medium pipe 5 into the discharge pipe 16 is discharged from the discharge pipe 16 into the latent heat storage material layer 15, and the heat medium oil 13 is combined with the latent heat storage material 12. The latent heat storage material layer 15 is raised by the specific gravity difference. In this ascending process, the high-temperature heat transfer oil 13 directly contacts the latent heat storage material 12, so that the latent heat storage material 12 in the heat storage tank 4 changes phase from a solid phase to a liquid phase and stores heat.

  By the way, the heat storage tank 4 needs to periodically maintain the discharge pipe 16 and the recovery pipe 17 therein, and at this time, in order to be able to perform work in the heat storage tank 4, the heat storage tank 4 It is necessary to discharge the latent heat storage material 12 inside. Therefore, as a method for discharging the latent heat storage material 12 in the heat storage tank 4 in a reusable state, a method for discharging the latent heat storage material according to the first embodiment of the present invention will be described below.

  First, all the latent heat storage materials 12 in the heat storage tank 4 are melted by the heat storage operation. Next, as shown in FIG. 3, a cooling and kneading device 22 is connected to the discharge pipe 20 of the heat storage tank 4, and the latent heat storage material 12 in the heat storage tank 4 is continuously charged into the cooling and kneading device 22. At this time, if the exhaust pipe 20 is heated with a heater (not shown) provided so as to cover the outer periphery thereof, the latent heat storage material 12 can be prevented from solidifying on the inner surface of the exhaust pipe 20.

  The cooling and kneading device 22 cools and kneads the latent heat storage material 12 while transferring the latent heat storage material 12 from the input port 23 side to the discharge port 24 side, and the latent heat storage material 12 that has become a powder state by the cooling and kneading. It discharges continuously from the discharge port 24.

  As shown in FIGS. 3 and 4, the cooling and kneading apparatus 22 includes a casing 25 in which an inlet 23 and an outlet 24 of the latent heat storage material 12 are formed, and two parallelly arranged in the casing 25. Screw shafts 26, 26. Each screw shaft 26 includes a rotating shaft 27 that rotates in opposite directions and a helical screw blade 28 provided on the outer periphery of the rotating shaft 27.

  The screw blades 28 are formed so that the screw blades 28 of each screw shaft 26 mesh with the screw blades 28 of the other screw shaft 26, and the latent heat storage material 12 in the casing 25 is moved from the inlet 23 side to the outlet 24 side. The kneading is carried out while being transferred to the machine. A return screw blade 29 is provided on the outer periphery of the rotating shaft 27 to push the latent heat storage material 12 that has passed through the discharge port 24 back to the discharge port 24 side.

  As shown in FIG. 4, the outer periphery of the screw blade 28 is provided with a notch 30 having a shape in which a part of the circumference is notched, and the latent heat storage material 12 in the casing 25 is formed by the notch 30. Is moved in the circumferential direction to increase the kneading efficiency of the latent heat storage material 12. Further, a scraper projection 31 for scraping off the latent heat storage material 12 attached to the inner surface of the casing 25 is formed at the rear end of the cutout portion 30 in the rotation direction. Further, the gap between the screw blades 28 at the meshing position is very small, and the other screw blade 28 scrapes off the latent heat storage material 12 attached to the front and rear surfaces of each screw blade 28.

  A jacket 32 is integrally provided outside the casing 25, and the casing 25 is cooled by a refrigerant flowing in a space 33 formed between the jacket 32 and the casing 25.

  The rotating shaft 27 has a hollow structure. As shown in FIG. 3, an inner tube 35 of a rotary joint 34 connected to the end of the rotating shaft 27 is inserted into the rotating shaft 27. As shown in FIG. 5, the inner tube 35 and the inner tube The rotary shaft 27 is partitioned into a refrigerant supply path 37 and a refrigerant discharge path 38 by a flange 36 provided on the outer periphery of the cylinder 35. The refrigerant supply path 37 communicates with one end of a spiral refrigerant passage 39 formed inside the screw blade 28, and the refrigerant discharge path 38 communicates with the other end of the refrigerant passage 39. As a result, the refrigerant supplied to the refrigerant supply port 40 of the rotary joint 34 is discharged from the refrigerant discharge port 41 of the rotary joint 34 through the refrigerant supply passage 37, the refrigerant passage 39, and the refrigerant discharge passage 38 in this order. The screw blades 28 are cooled by the refrigerant flowing through the passage 39.

  The cooling and kneading device 22 kneads the latent heat storage material 12 in the casing 25 while being transferred by the screw shaft 26, and simultaneously circulates the latent heat storage material 12 in the jacket 32 and the refrigerant circulating in the jacket 32. Cool with refrigerant. By this cooling and kneading, the liquid-phase latent heat storage material 12 charged into the charging port 23 is in a powder state before being discharged from the discharge port 24.

  When the latent heat storage material 12 is discharged from the heat storage tank 4 by the method described above, the latent heat storage material 12 in the heat storage tank 4 is discharged without adding water, so that the latent heat storage material 12 can be reused. Moreover, since the discharged latent heat storage material 12 is in a powder state, the operation of returning the latent heat storage material 12 into the heat storage tank 4 is easy.

  Further, as the latent heat storage material 12, the latent heat storage material 12 having a melting point of 100 ° C. or higher (for example, erythritol having a melting point of about 119 ° C., mannitol having a melting point of about 166 ° C., magnesium chloride hexahydrate having a melting point of about 115 ° C. Etc.), since water is not added to the latent heat storage material 12 in the heat storage tank 4, there is no danger of boiling water in the heat storage tank 4, and it is safe.

  Next, a method for discharging a latent heat storage material according to a second embodiment of the present invention will be described.

  As in the first embodiment, all the latent heat storage material 12 in the heat storage tank 4 is melted by the heat storage operation. Next, as shown in FIG. 6, a cooling and kneading device 42 is connected to the discharge pipe 20 of the heat storage tank 4, and the latent heat storage material 12 in the heat storage tank 4 is continuously charged into the cooling and kneading device 42.

  The cooling and kneading device 42 cools and kneads the latent heat storage material 12 while transferring the latent heat storage material 12 from the input port 43 side to the discharge port 44 side, and the latent heat storage material 12 in a powder state by the cooling and kneading. It discharges continuously from the discharge port 44.

  As shown in FIGS. 6 and 7, the cooling and kneading device 42 includes a casing 45 in which an inlet 43 and an outlet 44 of the latent heat storage material 12 are formed, and two rotations arranged horizontally in the casing 45. And shafts 46, 46. As shown in FIG. 6, a screw 47 for transferring the latent heat storage material 12 in the casing 45 from the input port 43 side to the discharge port 44 side and the latent heat storage material 12 in the casing 45 are disposed on the outer periphery of each rotating shaft 46. A large number of kneading paddles 48 to be kneaded are assembled. Here, a large number of kneading paddles 48 are assembled at different angles.

  As shown in FIG. 7, the two rotating shafts 46 and 46 are arranged in parallel and rotate in the same direction. The kneading paddle 48 is formed so that a cross-sectional shape along a plane perpendicular to the rotation shaft 46 is a spindle shape, and the outer periphery of the kneading paddle 48 of each rotation shaft 46 is the outer periphery of the kneading paddle 48 of the other rotation shaft 46. The latent heat storage material 12 adhered to the surface is scraped off. A jacket 49 is provided outside the casing 45, and the casing 45 is cooled by a refrigerant flowing in a space 50 formed between the jacket 49 and the casing 45.

  The cooling and kneading device 42 transports the latent heat storage material 12 in the casing 45 with the screw 47 and kneads it with the kneading paddle 48, and cools the latent heat storage material 12 with the refrigerant circulating in the jacket 49. By this cooling and kneading, the liquid-phase latent heat storage material 12 charged into the charging port 43 is in a powder state before being discharged from the discharging port 44.

  When the latent heat storage material 12 is discharged from the heat storage tank 4 by the above-described method, the latent heat storage material 12 is discharged without adding water to the latent heat storage material 12 in the heat storage tank 4 as in the first embodiment. Is possible. Moreover, since the discharged latent heat storage material 12 is in a powder state, the operation of returning the latent heat storage material 12 into the heat storage tank 4 is easy. Even when the latent heat storage material 12 having a melting point of 100 ° C. or higher is used as the latent heat storage material 12, water is not added to the latent heat storage material 12 in the heat storage tank 4, so that water boils in the heat storage tank 4. There is no danger and it is safe.

  The rotation shaft 46 may be a solid shaft as shown in the figure, but a refrigerant passage (not shown) may be formed inside the rotation shaft 46 so that the refrigerant circulates in the refrigerant passage. If it does in this way, the cooling performance of the latent heat storage material 12 in the casing 45 can be improved more.

  In each of the above embodiments, the cooling and kneading device 42 in which the two rotating shafts 46 and 46 rotate in the same direction has been described as an example. However, as shown in FIG. , 46B can be applied to a cooling and kneading apparatus that rotates in opposite directions at different speeds.

  In FIG. 8, a kneading paddle 48A having a multi-leaf cross section is assembled to the outer periphery of one rotating shaft 46A, and a kneading paddle 48B having an elliptical cross section is assembled to the outer periphery of the other rotating shaft 46B. ing. The kneading paddle 48A and the kneading paddle 48B rotate while maintaining a slight clearance to knead the latent heat storage material 12 in the casing 45. At this time, the kneading paddle 48A and the kneading paddle 48B scrape the latent heat storage material 12 with the outer periphery of the kneading paddle 48A adhering to the outer periphery of the kneading paddle 48B due to the difference in peripheral speed, and the outer periphery of the kneading paddle 48B is kneaded with the kneading paddle 48A. The latent heat storage material 12 adhering to the outer periphery is scraped off.

  In each of the above embodiments, the heat storage operation of the heat storage tank 4 is described as an example as a method for melting the latent heat storage material 12 in the heat storage tank 4, but it passes through the latent heat storage material layer 15 in the heat storage tank 4. The latent heat storage material 12 may be melted by providing a steam pipe (not shown) and flowing steam through the steam pipe. Further, an electric heater (not shown) may be provided in the latent heat storage material layer 15 in the heat storage tank 4 and the latent heat storage material 12 may be melted by energizing the electric heater.

  When the molten latent heat storage material 12 was introduced into the inlet 43 of the cooling and kneading device 42, a test was conducted to confirm that the latent heat storage material 12 was discharged in powder form from the outlet 44.

The test conditions are as follows.
Type of latent heat storage material: Erythritol (melting point 118 ° C)
Temperature of latent heat storage material: 150 ° C
Refrigerant type: Industrial water refrigerant temperature: 28 ° C
Cooling and kneading equipment: S2KRC kneader (manufactured by Kurimoto Steel Works)
Number of rotations of rotating shaft: 53rpm

  Under this condition, a total of 4 tonnes of latent heat storage material 12 was charged into the charging port 43 of the cooling and kneading device 42. The charged latent heat storage material 12 was discharged from the discharge port 44 in a white powder state. At this time, the temperature of the latent heat storage material 12 in a powder state was about 114 ° C.

4 heat storage tank 12 latent heat storage material 22 cooling kneading device 23 inlet 24 outlet 25 casing 26 screw shaft 27 rotating shaft 28 screw blade 30 notch 32 jacket 33 space 39 refrigerant passage 42 cooling kneader 43 inlet 44 outlet 45 Casing 46, 46A, 46B Rotating shaft 47 Screw 48, 48A, 48B Kneading paddle 49 Jacket 50 Space

Claims (6)

In the method for discharging a latent heat storage material, the latent heat storage material (12) that stores and releases heat using heat absorbed and released when the phase changes between the solid phase and the liquid phase is discharged from the heat storage tank (4).
The latent heat storage material (12) in the heat storage tank (4) is melted, and the molten latent heat storage material (12) is connected to the inlet (23) of the cooling and kneading device (22) connected to the heat storage tank (4). The cooling and kneading device (22) cools and kneads the latent heat storage material (12) while transferring the latent heat storage material (12) from the input port (23) side to the discharge port (24) side. A method for discharging a latent heat storage material, wherein the latent heat storage material (12) in powder form by cooling and kneading is continuously discharged from a discharge port (24).   The cooling and kneading device (22) includes a casing (25) having the charging port (23) and a discharging port (24), and two screw shafts (26, 26) disposed horizontally in the casing (25). And a jacket (32) that forms a space (33) through which a coolant for cooling the casing (25) flows is provided outside the casing (25), and each screw shaft (26) The rotary shaft (27) rotates in opposite directions, and a helical screw blade (28) provided on the outer periphery of the rotary shaft (27). The screw blade (28) is connected to each screw shaft (26). ) Of the screw blade (28) of the other screw shaft (26) is engaged with the screw blade (28) of the other screw shaft (26). Method for discharging the latent heat storage material according to claim 1, kneaded while transported to the outlet (24) side grayed (25) in the latent heat storage material (12) from inlet (23) side.   The method for discharging a latent heat storage material according to claim 2, wherein a refrigerant passage (39) is formed inside the screw blade (28).   The discharge method of the latent heat storage material of Claim 2 or 3 which provided the notch part (30) of the shape which notched a part of circumference at the outer periphery of the said screw blade | wing (28).   The cooling and kneading device (42) includes a casing (45) having the charging port (43) and a discharging port (44), and two rotating shafts (46, 46) disposed horizontally in the casing (45). And a jacket (49) forming a space (50) through which a refrigerant for cooling the casing (45) flows is provided on the outer side of the casing (45), and an outer periphery of each rotating shaft (46). The screw (47) for transferring the latent heat storage material (12) in the casing (45) from the inlet (43) side to the outlet (44) side, and the latent heat storage material (12) in the casing (45) A large number of kneading paddles (48) for kneading are assembled, and the kneading paddles (48) of the kneading paddles (48) of each rotating shaft (46) are the kneading paddles (48) of the other rotating shaft (46). ) Latent heat storage attached to the outer periphery of Method for discharging the latent heat storage material according to claim 1 which is formed so as to scrape (12).   The method for discharging a latent heat storage material according to claim 5, wherein a refrigerant passage is formed inside the rotating shaft (46).

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