JP2006256512A - Cold and heat accumulator, cold and heat accumulation capsule, and vehicular air-conditioner using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lightweight and compact cold and heat accumulator capable of storing a sufficient amount of a cold-and-heat accumulating agent, and promoting its dissolution (the latent heat travel speed), and superior in cooling capacity. <P>SOLUTION: The cold-and-heat accumulating agent stored in the cold-and-heat accumulator is stored with the shortest distance of ≤ 3 mm from a heat transfer surface on which ≥ 95% of its volume is brought into contact with the cold-and-heat accumulating agent. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a regenerator used in an air conditioner, a regenerator heat capsule, and a vehicle air conditioner using the regenerator.

Recently, from the viewpoint of environmental protection, various industrial products have been undertaken to save energy. In particular, a vehicular engine such as an automobile is remarkably developed in a technology for automatically stopping the vehicular engine when the vehicle is stopped such as waiting for a signal. In the future, there will be an increase in the number of vehicles that temporarily stop such vehicle engines, including hybrid vehicles.
By the way, in the vehicle air conditioner, since the compressor of the refrigeration cycle is driven by the vehicle engine, the vehicle is stopped by waiting for a signal such as a vehicle in which the engine is temporarily stopped, particularly a hybrid vehicle, and the vehicle engine is stopped. Each time the compressor stops, the temperature of the cooling evaporator rises, causing a problem that the air conditioning in the vehicle does not work. Therefore, at present, the compressor is operated by the battery of the vehicle, and the air conditioning cycle is operated even when the vehicle is temporarily stopped.

However, the above-mentioned technology is possible to some extent because a hybrid vehicle having a relatively large battery capacity has a margin in the battery capacity, but even in a vehicle equipped with a general lead battery having a relatively small battery capacity, Given the widespread use of idling stop vehicles in the future, it is difficult to have battery capacity to operate the compressor when the vehicle engine is stopped.
In a conventional vehicle air conditioner that is not a regenerative type, the condensed liquid refrigerant becomes low-pressure refrigerant by a decompression means such as an expansion valve and is sent to the evaporator. The liquid refrigerant is heated and exchanged by air sent to the vehicle interior to become a gas phase refrigerant, and at the same time, the air is cooled to air-condition the vehicle interior. The gas-phase refrigerant is sent again to the compressor and compressed to form a cycle for performing vehicle air conditioning.

In view of this, a cold storage means for storing cold during operation of the vehicle engine (compressor) is provided, and when the vehicle engine (compressor) stops and the cooling action of the evaporator stops, the cold storage heat amount of the cold storage means is used to enter the vehicle interior. There is an increasing need for a regenerative vehicle air conditioner that can cool the blown air.
As this type of regenerative vehicle air conditioner, there is a technology that comfortably holds the interior of a vehicle by operating a vehicle air conditioner that has a regenerator, especially when the engine is temporarily stopped waiting for a car signal. It is disclosed (for example, see Patent Document 1).

  In the cycle of the cold storage type vehicle air conditioner disclosed in Patent Document 1, a high-pressure refrigerant compressed by the compressor is sent to a condenser to be condensed. The high-pressure liquid refrigerant is provided with a regenerator and a liquid refrigerant tank in front of the evaporator after the pressure reducing means such as a pressure reducing valve is provided. The vehicle engine (compressor) stops when the vehicle is temporarily stopped, such as waiting for a signal, and at the same time the refrigerant is sent from the liquid refrigerant tank to the evaporator by a separate electric centrifugal pump. Perform indoor air conditioning.

On the other hand, Patent Document 1 described above describes an example of a capsule system as an example of the structure of a regenerator. For example, Patent Document 2 discloses a known example of improving the shape of the cold storage capsule itself for the purpose of solidifying or melting the cold storage agent (improving the latent heat transfer rate).
Here, an example in which fins are provided on the inner wall of a capsule to improve heat exchange characteristics for a cylindrical storage (cold) heat capsule is described, and this capsule is used in a cold storage type vehicle air conditioner. It seems to be effective for promoting the dissolution and solidification of the regenerator (the latent heat transfer rate of the regenerator).
JP 2003-285634 A Japanese Patent Laid-Open No. 11-270975

  As described above, in the regenerative vehicle air conditioner, in order for the refrigerant to condense in the regenerator when the vehicle engine (compressor) is stopped, it is important to stabilize the condensing capacity in the regenerator. Furthermore, since it is necessary to newly add a refrigerant circulation device such as a regenerator, a liquid refrigerant tank, and an electric centrifugal pump, it is necessary to consider restrictions on mounting the vehicle, and it must be compact. .

In addition, the heat transfer medium with fins has an effect of accelerating the dissolution of the regenerator (latent heat transfer speed) as compared with the heat transfer medium without fins. However, even if the number of fins is simply increased to further promote the melting of the regenerative heat agent (latent heat transfer rate), the melting of the regenerative heat agent (latent heat transfer rate) is increased even if the number of fins is increased when the number of fins exceeds a certain number. Turned out to be almost unchanged. And in the case of a cold storage heat capsule, the amount of cold storage heat agent held in the cold storage heat capsule decreases due to an increase in the number of fins, and the base material of the cold storage heat capsule is a metal such as aluminum This increases the weight of the fin portion more than necessary, which causes a problem that causes an increase in fuel consumption due to an increase in vehicle weight.
Accordingly, an object of the present invention is to provide a lightweight and compact regenerator that retains sufficient regenerator and promotes its dissolution (latent heat transfer rate) and has an excellent cooling capacity. To do.

In the present invention, such a problem has been solved by the following means.
(1) About the regenerator heat agent retained in the regenerator heat exchanger, 95% or more of the volume is retained within the shortest distance of 3 mm from the heat transfer surface in contact with the regenerator heat agent,
(2) A shell-and-tube type regenerator that uses a tubular heat transfer member for heat exchange between the regenerator and the regenerator agent, wherein the refrigerant fluid is circulated inside the tubular member, The regenerative heat generator according to (1), wherein the regenerator heat agent is held outside the body,
(3) A tubular capsule in which the regenerator agent is held inside the both ends of the tubular body, and 95% or more of the regenerator agent volume is within a shortest distance of 3 mm from the heat transfer surface of the capsule Cold storage heat capsule, characterized by being held in
(4) A regenerative heat generator using the regenerative heat capsule according to (3),
(5) A vehicle air conditioner using the regenerator of any one of (1), (2) or (4), and
(6) A vehicular air conditioner, wherein the regenerator according to any one of (1), (2), and (4) is installed in a refrigerant cycle.

  The regenerative heat storage device according to the present invention has a high latent heat transfer speed of the regenerative heat storage agent and is excellent in cooling capacity. And if this cool storage heat exchanger is used for a cool storage type vehicle air conditioner, it is possible to improve the condensing capacity of the gas phase refrigerant in the cool storage heat exchanger in the cooling cooling mode when the vehicle engine (compressor) is stopped. In addition, it is possible to provide a regenerator that is compact and suitable for practical use by designing for vehicle mounting.

Various examples of embodiments of a regenerator and a regenerator capsule according to the present invention will be described with reference to the accompanying drawings. In addition, in each figure, the same code | symbol is attached | subjected to the same element and the overlapping description is abbreviate | omitted.
First, a shell and tube type regenerator will be described as an example of a regenerator.
As shown in a perspective view of an example in FIG. 1A, a shell-and-tube regenerator 1 has a plurality of parallel tubular bodies 3 that are media for exchanging heat in a container (shell) 2. As shown in FIG. 1 (b), a cold storage heat agent 4 such as paraffin is filled in a container (shell) 2 corresponding to the outside of the tubular body 3. Inside the tubular body 3, a refrigerant fluid 5 for dissolving and solidifying the cold storage heat agent 4, for example, chlorofluorocarbon (R134a) or the like is circulated. In the case of a vehicle air conditioner, the refrigerant fluid 5 enters the regenerator in the gas phase, condenses, and is sent to the evaporator as a liquid phase.

The distance of the cold storage heat agent 4 filled in the container (shell) 2 from the heat transfer surface of the tubular body 3 which is a heat exchange medium in the present invention will be described.
In the case of a smooth tube in which the tubular bodies are arranged at equal intervals, the smooth tube 3a which is a heat exchange medium in the cold storage heat agent 4 (of the tubular body 3, the smooth tube is 3a, and the finned tube described later is 3b. ) Is the most distant from the heat transfer surface shown in FIG. 1 (c). In the present invention, the value of the shortest distance x from the point ● to the heat transfer surface of the tubular body, which is a heat exchange medium. Is set to 3 mm or less. When the value of x is 3 mm or less, the dissolution rate of the regenerative heat storage agent (that is, the latent heat transfer rate) is hardly changed, but when the value is larger than 3 mm, the dissolution rate gradually decreases. Therefore, the value of x needs to be 3 mm or less, and is practically preferably 1 mm or more and 2.5 mm or less. This is because if the volume is too small, the volume for storing the regenerator heat agent is reduced, and the desired amount of regenerator heat cannot be ensured, and in order to reliably set x to 3 mm or less, including manufacturing errors. Even if it thinks, it is enough if x is designed with 2.5 mm.

  Similarly, when the tubular body used for the shell-and-tube regenerator is a finned tube 3b in which fins 6 parallel to the axial direction of the tube are provided on the outer surface of the tube as shown in FIG. 1 (d). The minimum distance x to the point ● of the regenerator that is farthest from the heat transfer surface of the heat exchange medium can be designed with the distance to the fins, not the outer surface of the tube. The effect is that the number can be reduced. Further, if fins or grooves are provided inside the pipe through which the refrigerant fluid that exchanges heat with the cold storage heat agent flows, an effect of further improving the condensation of the refrigerant can be obtained.

If the value of x is reduced, it is necessary to increase in the height direction if the amount of the regenerative heat storage agent is the same, and as a result, the total regenerative heat exchanger tends to increase in volume. When the mountability is important for practical use as in a vehicle air conditioner, it is necessary to maximize the dissolution rate of the regenerator and reduce the space required for installing the regenerator. In such a case, when an appropriate number of fin portions, such as a tube with 8 fins on the outer surface shown in FIG. 1 (d), are provided, the value of x from the ● portion of the regenerator agent to the heat transfer surface is It is possible to maximize the dissolution rate of the regenerative heat storage agent by increasing the distance to the portion slightly larger by the increase in volume due to the fin portion formation in the height direction of the shell. As a result, the volume of the shell-and-tube regenerator can be made sufficiently smaller than when a smooth tube is used, and this is effective for ensuring mountability on a vehicle. Even when a finned tube is used, even if the value of x is smaller than 3 mm, it has little effect on maximizing the dissolution rate of the regenerative heat storage agent.
In FIG. 1A, the container (shell) 2 has a rectangular shape, but it is needless to say that a cylindrical shape or a rectangular tube shape can be used.

Next, as a regenerator of the present invention, a capsule regenerator will be described as an example with reference to FIG.
As shown in FIG. 2A and FIG. 2B with a perspective view and an explanatory cross-sectional view of an example thereof, in the capsule regenerator, a large number of capsules 7 are provided inside the container 2, and the regenerator agent 4 is provided inside the capsule 7. Is sealed, and the refrigerant fluid 5 is caused to flow through the gap between the capsules.
When the capsule 7 is a cylindrical capsule 7a as shown in FIG. 2 (c), the farthest part of the cold storage heat agent from the inner wall of the capsule which is the heat transfer surface of the heat exchange medium is the center of the cross-sectional circle. The shortest distance x from there to the heat transfer surface is the same value as the radius of the capsule cross-section circle (see FIG. 2D). In the present invention, the value of x is set to 3 mm or less. As described above, when x is 3 mm or less, the dissolution rate of the regenerative heat agent, that is, the latent heat transfer rate, hardly changes, but when it exceeds 3 mm, the dissolution rate gradually decreases. Practically, the value of x is preferably 1 mm or more and 2.5 mm or less. This is because if the volume is too small, the volume for enclosing the regenerative heat agent will be small, so that the desired amount of regenerative heat can not be secured, and in order to set the value of x to 3 mm or less, there is a manufacturing error. Even if it considers including it, it is enough if x is designed with 2.5 mm.

FIGS. 2E and 2F are examples of the capsule 7b with fins in which the fin 6 parallel to the axial direction is provided on the inner surface of the regenerative heat capsule. Of course, there is no problem even if the fin 6 is formed in a spiral shape, but the value of the shortest distance x to the inner wall surface of the capsule or the fin surface, which is the heat transfer surface of the heat exchange medium, is 3 mm in any part of the regenerator agent. Must be set to: By providing fins on the inner surface, the shortest distance x to the inner wall surface or fin surface of the capsule, which is the heat transfer surface of the heat exchange medium, is set to 3 mm or less even if the inner diameter of the capsule is increased. This makes it possible to increase the amount of the cold storage heat agent per capsule, so that the number of capsules used can be reduced. However, even if the value of x is made too small, the amount (volume) of the regenerative heat agent that can be enclosed becomes small, and not only the desired amount of regenerative heat (latent heat) cannot be secured, but also unnecessary fins As a result, it causes a problem that the weight of the portion increases, resulting in deterioration of fuel consumption for vehicles. Therefore, the value of x is preferably 1.5 mm or more.
Moreover, although the refrigerant | coolant fluid which heat-exchanges with a cool storage heat agent distribute | circulates the outer side of a capsule, in order to accelerate | stimulate condensation of a refrigerant | coolant fluid, it is also effective to provide a fin and a groove | channel on the capsule outer surface.

  In addition to a cylindrical capsule, the capsule may have a polygonal cylindrical shape, a spherical shape, or an elliptical spherical shape. If the shortest distance x from the inner surface of the capsule, which is the heat transfer surface of the heat exchange medium, is 3 mm or less at any part of the regenerator agent enclosed in the capsule, the dissolution rate of the regenerator agent can be used effectively. Not too long. However, spherical or oval spherical capsules have a lower efficiency of holding the regenerator agent than cylindrical capsules. Further, when a capsule is encapsulated in the regenerator, if there is a gap between the capsules, noise may be generated due to vibration during vehicle travel, which may impair the comfort in the vehicle. Therefore, it is necessary to fix the capsule, but fixing the spherical or oval spherical capsule is more time-consuming than the cylindrical capsule, which increases the manufacturing cost of the regenerator. Therefore, a cylindrical capsule is desirable as the capsule shape. Further, since the refrigerant fluid normally operates at a high pressure, a cylindrical shape is desirable from the viewpoint of pressure resistance. Here, “cylindrical” means that the cross section perpendicular to the longitudinal direction is a circle. Moreover, if it considers for the purpose of using it for a vehicle air conditioner, the length of the capsule is about 50 to 300 mm and the diameter is about 4 to 30 mm in consideration of enclosing the mountability and the desired amount of the regenerative heat storage agent. Are preferred.

  Further, when describing a tubular body or capsule used in a regenerator, there is a star tubular body or star capsule 8 having a star-shaped cross section as shown in FIG. If it is this shape, even if the uneven | corrugated | grooved part of a pipe part replaces a fin and encloses a cool storage heat agent inside as a capsule, for example, the value of x can be easily set to 3 mm or less. Further, even on the side where the refrigerant on the outside of the capsule is condensed, the concavo-convex portion can promote it and improve the efficiency of the entire regenerator. Moreover, the same effect can be acquired also when using the tubular body of this shape for a shell and tube type regenerator.

4 to 6 are examples intended to obtain an effect of promoting the condensation of the refrigerant on the side in contact with the refrigerant. In the case of a capsule-type regenerative regenerator, the outer surface of the capsule comes into contact with the refrigerant. As shown in FIG. 4, fins 6 are provided on the outer surface of the capsule 7, or knurled grooves 9 are formed in the capsule 7 by knurling as shown in FIG. It is also preferable to apply it, and since the contact area with the refrigerant that is the fluid to be cooled (heated) is increased, the phase change of refrigerant condensation or evaporation is promoted. In addition, since the refrigerant condenses into a liquid in the regenerator, the knurling process is performed on the outer surface of the capsule, so that the knurled groove becomes a passage for the condensed liquid and quickly leaves the outer surface of the capsule. Further, there is an effect that the condensation of the fluid to be cooled can be promoted.
FIG. 6 shows an example in which a groove 10 is provided inside the outer surface 8-fin tube 3b shown in FIG. If this tubular body is used in a shell-and-tube regenerator, the condensation of the refrigerant flowing inside the tube is promoted by the grooves. In addition, in the case shown in FIGS. 3-6, it cannot be overemphasized that the effect of this invention is not acquired unless the value of x is set to 3 mm or less as a constraint condition of the side which contact | connects a cool storage heat agent.
In both the shell-and-tube and capsule-type regenerators, the important factor that determines the dissolution rate of the regenerator is the shortest distance to the heat transfer surface of the heat transfer medium that contacts the regenerator and the regenerator. The value of the distance x.

Now, in either case of the shell-and-tube type or the capsule type, the value of the shortest distance x from the cold storage heat agent most distant from the heat transfer surface described in the present invention to the heat transfer surface of the heat exchange medium is practically used. It is assumed that there may be exceptions that do not fit below the designed dimensions. For example, when the shell and tube type regenerator 1 shown in FIG. 7 uses a tube 3b with external fins for the tubular body, in order to attach the tubular body to the container (shell) 2, it is better to remove the fins at the attachment portion. It becomes easy to fix the tubular body to the (shell), and as a result, there is an advantage of lowering the manufacturing cost of the regenerator. In practice, as shown in FIG. 7, there are some locations A in the regenerator that cause the value of x to be larger than the design value (3 mm or less in the present invention).
Also, as shown in FIG. 8, in the case of the capsule type, for example, when the cap 11 is provided at the end of the capsule, the cap part does not correspond to the heat transfer surface, so that x is larger than 3 mm as described above. The location A which becomes may exist in a cool storage heat agent. However, if the portion of 95 (volume)% or more of the stored regenerative heat agent is within the range set to x = 3 mm or less, the influence on the promotion of the dissolution rate of the regenerative heat agent is small. More desirably, as a result of the experiment, if 98 (volume)% or more of the cold storage heat agent is x = 3 mm or less, the dissolution of the cold storage heat agent is hardly affected.

  In addition, although the cool storage heater, cool storage heat capsule, or tubular body used for an air conditioner can be produced by a well-known method and the material can be selected suitably, it is preferable that it is metal. In particular, when used in an air conditioner for automobiles, plastics and the like cannot withstand this because of the large fluctuations in temperature during use and the need to use parts that can withstand vibration during travel. Therefore, it is preferably made of metal. Specifically, iron, copper, aluminum, or an alloy thereof such as stainless steel can be applied, but aluminum or an aluminum alloy is preferable from the viewpoint of material cost, workability, and lightness.

Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited thereto.
Example 1 (Example of shell-and-tube regenerator)
In this experiment, paraffin C14 was used as a cold storage heat agent. Paraffin C14 is a substance having a freezing point of 5.9 ° C., and becomes solid at 5.9 ° C. or lower and becomes liquid at higher temperature. The latent heat of phase change is 229 kJ / kg.
First, a shell-and-tube regenerative heat storage device shown in FIG. Table 1 shows the dimensions of the shell 2 of the shell-and-tube regenerator that was tested. As the heat transfer tube serving as the heat transfer medium, 225 smooth tubes (15 × 15) made of aluminum and having an outer diameter of 5 mm and a thickness of 0.5 mm (the inner diameter of the tube was 4 mm) were used. Moreover, the outer surface 8 finned tube shown in FIG. 1 (d) (similar to the above-mentioned smooth tube, and further having 8 fins with a height of 2 mm equally attached in the circumferential direction) is also made of aluminum and has 225 pieces similarly. Were used to manufacture a regenerator (three types shown in Table 1) and an experiment was conducted.

In this experiment, it experimented about the influence of the shortest distance x from the cool storage heat agent which is the most distant from the heat transfer surface which touches among the stored cool storage heat agents. Accordingly, since the regenerator agent of the portion marked with ● shown in FIGS. 1 (c) and 1 (d) exists in the most distant place from the heat transfer surface, this distance x is set to the value shown in Table 1 Experimented. All of the regenerative heat storage agent is held within the range of the value of x or less.
As for the size of the shell, the dimensions in the shell are set so that 550 g of the regenerative heat agent (paraffin C14) can be held. Therefore, the manufactured regenerator has a cooling amount of 0.55 kg × 229 kJ / kg≈126 kJ (note that the sensible heat is negligible because it is sufficiently smaller than the latent heat).

  The experiment method was as follows. First, the entire regenerator was cooled to 3.0 ° C., attached to the experimental device equipped with the thermometer and flow meter shown in FIG. 12 circulates inside the tube. The flow rate was 17 liters / minute. And the temperature of the water in the exit of the regenerator 1 is measured with progress of the distribution | circulation time of water. At this time, since the regenerative heat agent is solid at 3.0 ° C. in the initial state, heat exchange with 10.0 ° C. water is gradually dissolved to release the regenerative heat. The temperature at the temperature gradually rises to 10 ° C. The purpose of this experiment is to measure the dissolution rate of the regenerator, so if the water temperature at the outlet of the regenerator is 7.0 ° C, the regenerator (paraffin C14 with a melting point of 5.9 ° C) ) Was completely liquid, and the time from the start of water flow until the temperature at the outlet of the regenerator was 7.0 ° C. was measured. The obtained results are shown in Table 1.

  As apparent from Table 1, when the value of x is small, there is a tendency that the time until the water regenerator outlet temperature reaches 7 ° C. can be shortened, but even if x is smaller than 3 mm, the time Is hardly shortened. In other words, if the shape of the regenerator is set so that the value of x is 3 mm or less, the dissolution rate of the regenerator is maximized (the dissolution efficiency of the regenerator is maximized). I understood that I can do it.

Example 2 (Example of a capsule regenerator)
The capsule type regenerator as shown in FIG. 2 (a), the container 2 having the same cubic shape as in FIG. 1 (a) was manufactured and tested.
In this experiment, an aluminum cylindrical capsule 7a having a smooth inner surface, an outer diameter of 4 to 10.6 mm (five types), a thickness of 0.5 mm, and a length of 200 mm in the longitudinal direction was used as shown in FIG. The regenerator 1 was manufactured by arranging a predetermined number of capsules as shown in the table in a container 2 having a vertical and horizontal inner dimension of 68.5 mm and a height of 200 mm evenly in the vertical and horizontal directions. In addition, the same regenerator agent (paraffin C14) 4 as in Example 1 was enclosed inside the capsule, and the encapsulated regenerator agent was set to the same amount of 272 g in each example. Therefore, the amount of latent heat to be held is 0.272 kg × 229 kJ / kg≈62 kJ (sensible heat is negligible because it is sufficiently smaller than latent heat).
In this experiment, the value of the distance x from the stored heat storage heat agent and the heat transfer surface of the heat medium in contact with the heat storage heat agent is equal to the inner radius of the capsule because it is a cylindrical capsule (FIG. 2D). (See the part marked with ●). Table 2 lists the value of x.

  In the experiment method, the entire regenerator 1 encapsulated in the capsule is first cooled to 3 ° C. and attached to the experimental apparatus shown in FIG. It circulates through the gap between capsules. The flow rate was 17 liters / minute. And the temperature of the water in the exit of the cool storage heat | heater 1 was measured with progress of the distribution | circulation time of water. And the result obtained by measuring the time until the temperature at the cool storage heat | heater exit from the time of a water distribution start to 7.0 degreeC similarly to Example 1, and judging this as the completion | finish of melt | dissolution of a cool storage heat agent. Table 2 shows the evaluation.

  Examining the experimental results of the five capsule-type regenerators shown in Table 2, as in the case of the shell-and-tube regenerator, when the value of x is 3 mm or less, the dissolution rate of the regenerator is almost the same. However, if it is larger than 3 mm, the time required for dissolving the regenerator agent is greatly increased in proportion to the distance.

Example 3 (Example of Capsule Type Regenerator with Fins)
Next, an experiment was also conducted in the case of applying an aluminum capsule 7b having an outer diameter of 10.6 mm and a wall thickness of 0.5 mm provided with fins on the inner surface as shown in FIG. The regenerator is the same as in Example 2 except that a capsule with an internal fin is used.
In this experiment, the amount of the regenerative heat agent that can be held inside the capsule is reduced by the amount of fins provided inside the capsule, so that the length of the capsule is 210 mm, and the container that encloses the capsule has vertical and horizontal internal dimensions. Was 68.5 mm, the same as in Example 2, and the height was increased to 210 mm to produce an experimental capsule regenerator. The number of capsules is 25 (5 × 5) at regular intervals, and the number of fins and fin height are as shown in Table 3. Other regenerative heat storage agents, their holding amounts, experimental methods, etc. are the same as in Example 2.
In the case of a capsule provided with fins on the inner surface, the position considering the shortest distance x between the cold storage heat agent and the heat transfer surface of the heat transfer medium varies depending on the height and shape of the fins. For example, in the case of FIG. 2F, an intermediate position surrounded by two fins and the capsule inner wall must be considered.
Table 3 shows the results obtained.

As can be seen from Table 3, the tendency to accelerate the dissolution rate of the regenerative heat storage agent (paraffin 4C) by providing fins is observed compared to the case without fins, but the tendency is that the value of x is less than 3 mm. It was found that it was limited to small cases.
In addition, as an advantage of the capsule regenerator as in this embodiment, the shell and tube regenerator requires a cost for the manufacturing process of attaching the tube to the shell, whereas the capsule enclosing the regenerator is used. It can arrange | position in a container and can use the container as refrigerant | coolant piping, and can simplify a manufacturing process.
In the vehicle air conditioner, reduction of the manufacturing cost of equipment is also a big problem, and in this respect, the capsule regenerator is more preferable than the shell-and-tube regenerator.

Example 4 (Example in which there is an exceptional part (end processing) of the value of x)
Next, in practice, there may be some exceptional portions where the value of x is 3 mm or more.
In this example, for a capsule having a length of 210 mm, an outer diameter of 10.6 mm, a wall thickness of 0.5 mm, and an inner surface with four fin heights of 2 mm evenly in the circumferential direction, portions where fins are not formed at both ends thereof. Provided (see FIG. 8), an exceptional part A having a value of x larger than 3 mm was intentionally created, and the influence thereof was examined. The number of capsules provided in the container was 25 at regular intervals, as in Example 3.
Other regenerative heat storage agents, their holding amounts, experimental methods, etc. are the same as in Example 3.
The experimental results obtained are shown in Table 4.

  As is apparent from the results in Table 4, when 95% or more of the volume of the regenerative heat agent held in the capsule and x value is 3 mm or less, the 7 ° C. arrival time is excellent. However, when the volume of the portion where the value of x is larger than 3 mm is 10% or more, it has been found that the 7 ° C. arrival time becomes slow and the heat transfer rate is slow.

1 is an example of a shell-and-tube regenerator according to the present invention, where (a) is a perspective view thereof, (b) is a cross-sectional explanatory diagram thereof, and (c) is a shortest distance to a heat transfer surface when a smooth tube is used. The figure explaining x, (d) is a figure explaining the shortest distance x to the heat-transfer surface at the time of using a pipe | tube with a fin. 1 is an example of a capsule regenerator according to the present invention, (a) is a perspective view thereof, (b) is a cross-sectional explanatory view thereof, (c) is an external view of a regenerator capsule, and (d) is a case where a regenerator capsule is used. The figure explaining the shortest distance x to the heat-transfer surface of (a) is a perspective view of the cold storage capsule with an internal fin, (f) is the shortest distance x to the heat transfer surface when using the cold-storage capsule with an internal fin. It is a figure explaining. It is an example of the tubular body or capsule as one embodiment which can be preferably used in the present invention. It is an example of the capsule as one embodiment which can be preferably used in the present invention. It is an example of the capsule as one embodiment which can be preferably used in the present invention. It is an example of the tubular body as one embodiment which can be preferably used in the present invention. It is explanatory drawing of the shell and tube type cool storage heat | fever which the part from which the value of x becomes 3 mm or more exists. It is explanatory drawing of the capsule in which the part from which the value of x becomes 3 mm or more exists. It is the schematic of the experimental apparatus used in the Example.

Explanation of symbols

1 Regenerator 2 Container (shell)
DESCRIPTION OF SYMBOLS 3 Tubular body 4 Cold storage heat agent 5 Refrigerant fluid 6 Fin 7 Capsule 8 Star tubular body or star capsule 9 Knurled groove 10 Groove 11 Cap 12 Pump

Claims (6)

  About 95% or more of the volume of the regenerative heat agent retained in the regenerator, the regenerator is characterized by being retained within a shortest distance of 3 mm from the heat transfer surface in contact with the regenerator.   The regenerator is a shell-and-tube regenerator that uses a tubular heat transfer member to exchange heat with a regenerator agent, wherein a refrigerant fluid is circulated inside the tubular body, and the outside of the tubular body The regenerator of claim 1, wherein a regenerator is stored.   A tubular capsule in which a cold storage heat agent is held in the inside of which both ends of the tubular body are closed, and 95% or more of the volume of the cold storage heat agent is held within a minimum distance of 3 mm from the heat transfer surface of the capsule. Cold storage heat capsule characterized by that.   A regenerative heat storage device using the regenerative heat storage capsule according to claim 3.   An air conditioner for a vehicle using the regenerator according to any one of claims 1, 2, or 4. The vehicle air conditioner, wherein the regenerator according to any one of claims 1, 2, and 4 is attached in a refrigerant cycle.

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