JP2014126281A - Thermal storage unit, and heating and cooling system comprising the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermal storage unit capable of maintaining high heat exchangeability even without installation of a complicated device, and a heating and cooling system comprising the same.SOLUTION: A thermal storage unit 4 includes: a case 41; a tubular heat transfer part 42 that is arranged inside the case 41 and through which a heat medium is circulated; a plurality of granules of granular gelled paraffin 43, which are housed within the case 41 and which cover the periphery of the heat transfer part 42; and an antifreezing solution 44 that is infilled between the granules of gelled paraffin 43 and the case 41.

Description

  The present invention relates to a heat storage unit and an air conditioning system including the same.

  Thermal storage units are used in buildings such as houses and other fields. In the heat storage unit, a latent heat storage material is stored inside the case, a pipe through which a heat medium such as antifreeze liquid is circulated is placed inside the case, and the latent heat storage material is solidified or melted around the pipe, And heat exchange between the heat storage material and the latent heat storage material. In the solidification process (cold storage process) of the latent heat storage material in such a heat storage unit, since the solidified latent heat storage material is fixed around the pipe, the fixed latent heat storage material becomes a thermal resistance and hinders the progress of the cold storage. . On the other hand, in the melting process of the latent heat storage material (cooling process), it starts to melt from the latent heat storage material fixed to the surface portion of the tube, so that the solidified latent heat storage material remains at the portion away from the tube, and the thermal refrigerant in the tube However, it does not cool sufficiently, which hinders the progress of cooling.

In view of this, for the purpose of improving heat exchange, conventionally, a heat transfer section in which a medium flows is arranged in a heat storage tank filled with a refrigerant body, and a bubble blowing hole is formed in the lower part of the heat storage tank. There is a heat storage unit that disposes the bubble blowing portion and causes a forced flow or disturbance in the refrigerant body near the outer periphery of the heat transfer portion by the bubbles blown out from the bubble blowing hole (Patent Document 1).
In the heat storage unit shown in Patent Document 1, one end of the bubble blowing portion is connected to a pressurized air supply device arranged outside the heat storage tank.

JP 2001-33069 A

However, in the heat storage unit shown in Patent Document 1, the pressurized air supply device requires at least a pump that supplies pressurized air, a motor that drives the pump, a pump and a motor control device, and a filter that filters air. , The structure becomes complicated. That is, unless a pressurized air supply device having a complicated structure is provided, there is a problem that it is difficult to maintain high heat exchange in the heat storage unit.
The objective of this invention is providing the heat storage unit which can maintain high heat exchange property, and an air conditioning system provided with the same, without providing a complicated apparatus.

  The heat storage unit 4 of the present invention will be described with reference to the drawings. A case 41, a tubular heat transfer portion 42 that is disposed inside the case 41 and through which a heat medium flows, and an inside of the case A plurality of granular latent heat storage materials that are housed and cover the periphery of the heat transfer section, and an antifreeze liquid 44 that is filled between the latent heat storage materials and the case are provided.

  In the present invention having this configuration, the heat storage unit includes a plurality of granular latent heat storage materials covering the periphery of the heat transfer section, and an antifreeze liquid filled between the latent heat storage material and the case. Since the granular latent heat storage material maintains its shape when solidified and melted, the antifreeze liquid always convects naturally around the heat transfer section. As a result, an effect of promoting heat transfer such as convection heat transfer caused by natural convection of the antifreeze acts on the outer peripheral surface of the heat transfer section. Therefore, high heat exchange can be maintained in the heat storage unit without providing a complicated device for promoting heat transfer as in the prior art.

In the present invention, the latent heat storage material is preferably formed from gelled paraffin 43, and the melting point of the latent heat storage material is preferably set by adjusting the components of the gelled paraffin.
In this invention of this structure, it can utilize, when cooling and heating the heat storage unit provided with such a gelled paraffin.

In this invention, it is preferable that melting | fusing point of the said latent heat storage material is set to 4 to 12 degreeC.
In this invention of this structure, when cooling, the heat storage unit provided with such a gelled paraffin can be utilized.

In this invention, it is preferable that melting | fusing point of the said latent heat storage material is set to 40 to 60 degreeC.
In this invention of this structure, when heating, the heat storage unit provided with such a gelled paraffin can be utilized.

The cooling / heating system 1 of the present invention includes a heat storage unit having the above-described configuration, a heat source 2 connected to one end of a heat transfer unit of the heat storage unit, and heat disposed in a room connected to the other end of the heat transfer unit. An exchange panel is provided.
In the present invention having this configuration, since the heat storage unit can maintain high heat exchange and no complicated device is provided for promoting heat transfer, which increases the cost, the cost for maintaining the cooling and heating as a whole increases. Can be prevented.

The figure which shows the air conditioning system concerning one Embodiment of this invention. The perspective view which shows the thermal storage unit concerning one Embodiment of this invention. The schematic diagram which shows the inside of a thermal storage unit.

An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows an air conditioning system 1 according to the present embodiment.
In FIG. 1, an air conditioning system 1 is disposed between a heat pump 21 and a heat exchange unit 22, a panel louver 3 as a heat exchange panel connected to the heat exchange unit 22, and the panel louver 3 and the heat exchange unit 22. The heat storage unit 4 is provided. The heat pump 21 and the heat exchange unit 22 constitute the heat source 2.

The heat pump 21 includes a compressor, an expansion valve (both not shown), and the like. When the refrigerant such as alternative chlorofluorocarbon or CO ₂ gas is compressed by the compressor, and when the refrigerant is expanded by the expansion valve The water as a heat medium returning to the heat exchange unit 22 from the second connection pipe 72 described later through the heat exchange unit 22 is heated or cooled using the heat absorption phenomenon. The heat pump 21 heats the water returning to the heat exchange unit 22 when, for example, the outside air temperature is a predetermined temperature, and returns to the heat exchange unit 22 when the outside air temperature exceeds the predetermined temperature. Cool down.

The heat exchange unit 22 flows hot water heated by the action of the heat pump 21 or cooled cooling water toward the panel louver 3.
The panel louver 3 is used, for example, when the room louver 3 is disposed in the room of the house 10 to cool or heat the room. The panel louver 3 is made of, for example, aluminum, and both upper and lower ends thereof are closed. The tube louver 3 is attached to a plurality of tube members 31 that extend along the vertical direction and are arranged in parallel with each other at a predetermined interval. And an installation stand (not shown). In the present embodiment, a plurality of, for example, six tube members 31 are provided.

The upper parts of the plurality of pipe members 31 are joined and joined by an upper joining member 32A made of, for example, aluminum. A communication path (not shown) is formed at a joint portion between the upper portion of the pipe member 31 and the upper joint member 32A. A weir (not shown) that prevents water flowing in the pipe member 31 from flowing out of the predetermined flow path is provided at a predetermined position inside the upper bonding member 32A.
Moreover, the lower part of the some pipe member 31 is joined and connected by the lower joining member 32B formed, for example with aluminum. A communication path (not shown) is formed at a joint portion between the lower portion of the pipe member 31 and the lower joint member 32B. However, the joint part between the lower part of the pipe member 31 arranged at the leftmost side in FIG. 1 and the lower joint member 32B, and the joint part between the lower part of the pipe member 31 arranged at the rightmost side in FIG. There is no communication path formed in. A weir (not shown) is provided at a predetermined position inside the lower joint member 32B to prevent water flowing in the pipe member 31 from flowing out of the predetermined flow path.

Such a panel louver 3 is connected to the heat exchange unit 22 via a first pipe 51, a second pipe 52, and the like. Specifically, the lower part of the pipe member 31 arranged on the leftmost side in FIG. 1 and the heat exchange unit 22 are connected via the first pipe 51, and the first pipe 51 includes the heat exchange unit 22. An on-off valve 61 arranged on the front side, a switching valve 62 arranged outside the room, and a two-way valve 63 arranged indoors are provided.
Moreover, the 2nd piping 52 is connected to the lower part of the pipe member 31 arrange | positioned at the rightmost side in FIG. 1, and the 3-way valve 64 arrange | positioned outdoors is provided in the 2nd piping 52. As shown in FIG. In FIG. 1, the portion of the second pipe 52 that connects the three-way valve 64 and the switching valve 66 is not used when indoor air conditioning is performed.

  A first branch pipe 53 branches from a portion of the first pipe 51 where the switching valve 62 is provided, and a second branch pipe 54 branches from a portion of the second pipe 52 where the three-way valve 64 is provided. The first branch pipe 53 and the second branch pipe 54 are joined by a three-way valve 65. A first connection pipe 71 is connected to the three-way valve 65.

2 and 3 show the heat storage unit 4 of the present embodiment.
The heat storage unit 4 is made of an acrylic, cube-shaped case 41, a copper-made tubular heat transfer portion 42 that is disposed inside the case 41 and through which water flows, and a heat transfer portion that is housed inside the case 41. 42 includes a gelled paraffin 43 serving as a latent heat storage material covering the periphery of 42, and an antifreeze liquid 44 filled between the case 41 and the gelled paraffin 43.

The case 41 has a size that can be installed, for example, under the floor of the house 10. In the present embodiment, the case 41 has a width of 500 mm, a depth of 500 mm, and a height of 300 mm.
The heat transfer section 42 is bent and formed on the upper side heat transfer section 421 disposed in the upper part inside the case 41, and the lower side formed on the lower section formed inside the case 41 and bent. The heat transfer part 422 and the connection heat transfer part 423 which connects the upper heat transfer part 421 and the lower heat transfer part 422 are provided. However, the shape of the heat transfer portion 42 is not limited to the shape shown in FIG. 2, and may be any shape as long as the water flowing in the heat transfer portion 42 flows from the upper side to the lower side inside the case 41. It may be a mold, a sheet mold, a multistage serpentine tube, or the like.

The gelled paraffin 43 is formed from a plurality of particles. The individual shapes of the gelled paraffin 43 are prismatic or other shapes, and the gelled paraffin 43 has a size of about 20 mm square. The gelled paraffin 43 is, for example, CALGRIP (registered trademark) manufactured by JSR Corporation, and the melting point of the gelled paraffin 43 is set by adjusting the components of the gelled paraffin 43. The gelled paraffin 43 maintains its shape when solidified and melted. Such a gelled paraffin 43 is accommodated in the case 41 so as not to convect in the vertical direction.
The antifreeze liquid 44 is made of ethylene glycol or the like, and is a liquid that does not freeze even when cooled.

  In such a heat storage unit 4, as shown in FIG. 1, the upper heat transfer section 421 is connected to the first connection pipe 71, and the lower heat transfer section 422 is disposed on the front side of the heat exchange unit 22. The second connection pipe 72 connected to the switching valve 66 is connected. As a result, the heat exchange unit 22 and the heat pump 21 are connected to one end side of the heat transfer section 42, and the panel louver 3 is connected to the other end side of the heat transfer section 42.

As shown in FIG. 3, in the heat storage unit 4, the individual gelled paraffin 43 maintains the shape, and the heat transfer section is formed inside the antifreeze liquid 44 by the cooling water or hot water flowing in the heat transfer section 42. Since there is a temperature difference between the periphery of the heat transfer part 42 and the part away from the heat transfer part 42, the antifreeze liquid 44 always convects naturally around the heat transfer part 42.
And if a cooling water is poured in the heat-transfer part 42, the gelatinized paraffin 43 will solidify and it will be in the state of cold storage. At this time, the heat of solidification released from the gelled paraffin 43 is transmitted to the antifreeze liquid 44 and is transmitted to the cooling water in the heat transfer section 42 via the antifreeze liquid 44.
On the other hand, when warm water having a predetermined temperature is passed through the heat transfer section 42, the heat released from the warm water is transmitted to the antifreeze liquid 44 and is transmitted to the gelled paraffin 43 via the antifreeze liquid 44, and the gelled paraffin 43 is melted. It is allowed to cool.

Next, returning to FIG. 1, indoor cooling using the panel louver 3 will be described.
When the panel louver 3 is used for cooling, a gelled paraffin 43 having a melting point adjusted to 4 ° C. or higher and 12 ° C. or lower is used.
First, for example, the gelled paraffin 43 is solidified at night when the temperature is low, and the heat storage unit 4 is in a cold storage state in advance.

  Specifically, as indicated by a broken line arrow in FIG. 1, the cooling water cooled by the action of the heat pump 21 is caused to flow from the heat exchange unit 22 into the first pipe 51, and the first branch pipe is passed through the switching valve 62. Flow in 53. Then, the cooling water is caused to flow into the first connection pipe 71 via the three-way valve 65 and flow into the heat transfer section 42 of the heat storage unit 4. The gelled paraffin 43 is solidified by the cooling water flowing in the heat transfer section 42 and is in a cold storage state. At this time, the solidification heat released from the gelled paraffin 43 is transferred to the cooling water in the heat transfer section 42 via the antifreeze liquid 44, and heat is added to the water in the heat transfer section 42. The water to which this heat has been applied returns to the heat exchange unit 22 through the second connection pipe 72. In the present embodiment, the cooling water flowing in the heat transfer section 42 is about 5 to 10 ° C.

Next, the switching valve 62 is switched, for example, during the daytime so that the water in the first pipe 51 does not flow into the first branch pipe 53. And as shown by the solid line arrow of FIG. 1, the cooling water cooled by the effect | action of the heat pump 21 is poured in the 1st piping 51 from the heat exchange unit 22 in the state by which the heat storage unit 4 was cold-stored previously.
The cooling water flows from the lower side into the pipe member 31 arranged on the leftmost side in FIG. 1 via the on-off valve 61, the switching valve 62, and the two-way valve 63. The cooling water meanders and flows in the adjacent pipe members 31 so as to be opposite to each other through the communication path. At this time, the cooling water flowing through the pipe member 31 absorbs heat, and the room is cooled.

  Thereafter, the water heated by absorbing heat flows out from the lower portion of the pipe member 31 arranged on the rightmost side in FIG. 1 to the second pipe 52 and flows into the second branch pipe 54 via the three-way valve 64, It flows into the first connecting pipe 71 via the three-way valve 65. The warmed water flows in the heat transfer section 42 of the heat storage unit 4, and the heat released from the water flowing in the heat transfer section 42 is transferred to the gelled paraffin 43 via the antifreeze liquid 44 and solidifies. The gelled paraffin 43 melts. As a result, water whose heat has been released and whose temperature has decreased returns to the heat exchange unit 22 through the second connection pipe 72.

And the water which returned to the heat exchange unit 22 is cooled again by the effect | action of the heat pump 21, and the cooling water cooled by the effect | action of the heat pump 21 is again sent to the panel louver 3 via the 1st piping 51 from the heat exchange unit 22. Supplied.
By such cooling water circulation, cooling using the panel louver 3 is performed.

Next, the heat storage unit 4 is also used when heating is performed using the panel louver 3. Below, the indoor heating using the panel louver 3 is demonstrated.
When heating is performed using the panel louver 3, a gelled paraffin 43 having a melting point adjusted to 40 ° C. or higher and 60 ° C. or lower is used.
First, the gelled paraffin 43 is melted, for example, during the daytime when the temperature is high, so that the heat storage unit 4 is in a heat storage state in advance.

  Specifically, as indicated by the broken-line arrows in FIG. 1, hot water having a predetermined temperature heated by the action of the heat pump 21 is caused to flow from the heat exchange unit 22 into the first pipe 51, and then passed through the switching valve 62. Flow in one branch pipe 53. Then, the warm water is caused to flow into the first connection pipe 71 via the three-way valve 65 and flow into the heat transfer section 42 of the heat storage unit 4. The heat released from the hot water (40 to 60 ° C.) flowing through the heat transfer section 42 is transmitted to the gelled paraffin 43 via the antifreeze liquid 44, and the gelled paraffin 43 is melted to be in a heat storage state. The water whose temperature has decreased due to the release of heat returns to the heat exchange unit 22 through the second connection pipe 72.

  Next, for example, the switching valve 62 is switched at night when the temperature is lowered, so that the water in the first pipe 51 does not flow into the first branch pipe 53. Then, as indicated by the solid line arrows in FIG. 1, hot water having a predetermined temperature that is heated by the action of the heat pump 21 is caused to flow from the heat exchange unit 22 into the first pipe 51 in a state in which the heat storage unit 4 is preheated. The hot water flows from the lower side into the pipe member 31 arranged on the leftmost side in FIG. 1 via the on-off valve 61, the switching valve 62, and the two-way valve 63. The hot water meanders and flows in the adjacent pipe members 31 so as to be opposite to each other through the communication path. At this time, heat is radiated from the hot water flowing in the pipe member 31, and the room is heated.

  Thereafter, the water whose temperature has been reduced due to the release of heat flows out from the lower part of the pipe member 31 arranged on the rightmost side in FIG. 1 to the second pipe 52 and passes through the three-way valve 64 in the second branch pipe 54. And flows into the first connection pipe 71 via the three-way valve 65. Then, the water whose temperature has decreased flows in the heat transfer section 42 of the heat storage unit 4, heat is released from the gelled paraffin 43 in the heat storage state, and the heat released from the gelled paraffin 43 passes through the antifreeze liquid 44. Then, the heat is transferred to the water in the heat transfer section 42 and heat is added to the water in the heat transfer section 42. The water to which this heat has been applied returns to the heat exchange unit 22 through the second connection pipe 72.

And the water which returned to the heat exchange unit 22 is heated again by the effect | action of the heat pump 21, and the warm water heated by the effect | action of the heat pump 21 is again supplied to the panel louver 3 from the heat exchange unit 22 via the 1st piping 51. Is done.
Heating using the panel louver 3 is performed by circulating such heated hot water.

Therefore, in the present embodiment, the following operational effects can be achieved.
(1) The heat storage unit 4 includes a plurality of granular gelled paraffins 43 that cover the periphery of the heat transfer section 42, and an antifreeze liquid 44 that is filled between the gelled paraffin 43 and the case 41. The granular gelled paraffin 43 maintains its shape when it is solidified and melted, so that the antifreeze liquid 44 always naturally convects around the heat transfer section 42. As a result, an effect of promoting heat transfer such as convection heat transfer due to natural convection of the antifreeze liquid 44 acts on the outer peripheral surface of the heat transfer section 42. Therefore, it is possible to maintain high heat exchange in the heat storage unit 4 without providing a complicated device for promoting heat transfer as in the past.

(2) Since the melting point of the gelled paraffin 43 is set by adjusting the components of the gelled paraffin 43, when the heat storage unit 4 including such a gelled paraffin 43 is cooled using the panel louver 3 It can also be used when heating.

(3) When the melting point of the gelled paraffin 43 is set to 4 ° C. or higher and 12 ° C. or lower, when the panel louver 3 is used for cooling, the heat storage unit 4 including such a gelled paraffin 43 is used. it can.

(4) When the melting point of the gelled paraffin 43 is set to 40 ° C. or higher and 60 ° C. or lower, when the panel louver 3 is used for heating, the heat storage unit 4 including such a gelled paraffin 43 is used. it can.

(5) The air conditioning system 1 includes the heat storage unit 4, the heat pump 21 and the heat exchange unit 22 connected to one end of the heat transfer unit 42 of the heat storage unit 4, and the panel louver 3 connected to the other end of the heat transfer unit 42. With. In such an air conditioning system 1, since the heat storage unit 4 can maintain high heat exchange and no complicated device is provided to promote heat transfer, which increases the cost, the overall cost of maintaining the air conditioning is low. It can be prevented from becoming high.

Note that the present invention is not limited to the above-described embodiment, and includes the following modifications as long as the object of the present invention can be achieved.
For example, in the above embodiment, water is used as the heat medium. However, the present invention is not limited to this, and any fluid other than water may be used as long as the fluid can move heat.
In the said embodiment, although the gelatinized paraffin 43 was used as a granular latent heat storage material, it is not limited to this, A capsule-type paraffin may be sufficient. Further, the size and shape of the gelled paraffin 43 are not limited to 20 mm square, and may be any size or shape that allows the antifreeze liquid 44 to pass through the gap between the gelled paraffin 43. That is, the size of the gelled paraffin 43 can be selected from about 5 to 50 mm, and the shape of the gelled paraffin 43 can be selected from a spherical shape, a triangular pyramid shape, a cylindrical shape, and the like.

  In the above-described embodiment, the antifreeze liquid 44 is made of ethylene glycol. However, the antifreeze liquid 44 is not limited to this, and any liquid that does not freeze even when cooled during use may be used. Water may be used.

In the embodiment, the panel louver 3 is used when heating is performed. However, when heating is performed, a plurality of radiation panels may be used as a heat exchange panel.
Moreover, in the said embodiment, although the six pipe members 31 of the panel louver 3 were provided, it is not limited to this, It is provided so that the water which flowed in from the 1st piping 51 may flow into the 2nd piping 52. As long as it is, it may be fewer than six or more than six.

  INDUSTRIAL APPLICABILITY The present invention can be used as a heat storage unit and an air conditioning system including the same in buildings such as houses and other fields.

  DESCRIPTION OF SYMBOLS 1 ... Air-conditioning system, 2 ... Heat source, 3 ... Panel louver which is a heat exchange panel, 4 ... Thermal storage unit, 41 ... Case, 42 ... Heat-transfer part, 43 ... Gelatin paraffin which is a latent heat storage material, 44 ... Antifreeze

Claims (5)

  A case, a tubular heat transfer portion disposed inside the case and through which a heat medium flows, and a plurality of granular latent heat storage materials housed in the case and covering the periphery of the heat transfer portion And a non-freezing liquid filled between the latent heat storage material and the case. In the heat storage unit according to claim 1,
The latent heat storage material is formed from gelled paraffin, and the melting point of the latent heat storage material is set by adjusting the components of the gelled paraffin. In the heat storage unit according to claim 2,
The melting point of the latent heat storage material is set to 4 ° C. or more and 12 ° C. or less. In the heat storage unit according to claim 2,
The melting point of the latent heat storage material is set to 40 ° C. or more and 60 ° C. or less.   The heat storage unit according to any one of claims 1 to 4, a heat source connected to one end of a heat transfer unit of the heat storage unit, and connected to the other end of the heat transfer unit and arranged indoors. An air conditioning system comprising a heat exchange panel.