JP2000180082A - Cold storage heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cold storage heat exchanger excellent in cold radiation efficiency. SOLUTION: One or more tube member 1a-1d, a heat exchanging plate 2, and a cold storage member 6 containing a cold storage material in a bag member 5 are stacked sequentially while directing the longitudinal direction of the tube member in parallel with the plane direction of the heat exchanging plate thus constituting a cold storage heat exchanger 10. The heat exchanging plate is provided at at least one position in the heat exchanging plate, on the side facing the tube member or on the side facing the cold storage member with a channel 3 formed such that the air flows along the plane direction of the heat exchanging plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a regenerative heat exchanger provided with a regenerative material.

[0002]

2. Description of the Related Art In recent years, in order to suppress power demand peaks,
There is a power rate system in which daytime and nighttime power rates differ. Therefore, it is possible to effectively use inexpensive power at night to cool the space to be cooled in the daytime (for example, in a freezer or refrigerator).
A regenerative cooling system that cools air is generally widely used. The regenerative cooling system generally includes a refrigerator and a regenerative heat exchanger. The refrigerator is configured by connecting an expansion valve, an evaporator, and the like, such as a compressor and a condenser, in order by refrigerant piping. A regenerative heat exchanger generally includes a regenerative material and a pipeline connected to a refrigerator.

In the regenerative cooling system, a regenerative operation and a cooling operation are performed in addition to a normal operation performed using only a refrigerator. Cold storage operation means that during the night when the electricity charge is cheaper, the refrigerant cooled from the refrigerator flows through the pipeline constituting the cold storage heat exchanger, and cools and solidifies the cold storage material provided in the cold storage heat exchanger. Means to store cold heat in the cold storage material. Cooling operation means that during the daytime when the electricity charge is expensive, air is sent to the regenerative heat exchanger with a blower or the like, and heat is exchanged between the air and the regenerator material to take out the stored cold heat. This refers to an operation of cooling the inside of a cooled space such as a freezer using cold heat.

[0004] Since the performance of the regenerative cooling system is largely dependent on the regenerative heat exchanger, various regenerative heat exchangers have been proposed. FIG. 4 is a diagram showing an example of a conventional regenerative heat exchanger, showing only a part. As shown in the example of FIG. 4, the regenerative heat exchanger 40 includes a pipe 41 and a regenerative member 44. The pipe 41 is formed by connecting a plurality of pipe members 42 with a U-shaped connecting pipe 43. The plurality of pipe members 42 are arranged in rows in the horizontal direction and the vertical direction. The cold storage member 44 is configured by storing a cold storage material in a wrapping member. Cold storage member 44
Are placed on the pipe members 42 forming a horizontal row, and are in direct contact with the pipe members 42. Reference numeral 45 denotes a blower, which sends cold heat stored in the cold storage material to a space to be cooled (not shown). This regenerative heat exchanger is characterized in that the regenerative member 44 is in direct contact with the pipe 41, so that it has excellent cooling efficiency.

[0005]

However, in the regenerative heat exchanger shown in FIG. 4, since the pipeline 41 is disposed between the regenerative members 44, the air is blown from the blower. There is a problem that it is difficult to secure the air flow path and the cooling efficiency is low. Further, improvement of the cooling efficiency is an important issue for the regenerative heat exchanger in order to reduce the power consumption of the regenerative cooling system.

An object of the present invention is to solve the above-mentioned problems and to provide a regenerative heat exchanger excellent in cooling efficiency.

[0007]

The regenerative heat exchanger of the present invention has the following features. (1) One or more pipe members, a heat exchange plate, and a cold storage member formed by storing a cold storage material in a wrapper member with the longitudinal direction of the pipe member parallel to the surface direction of the heat exchange plate. At least one of the inside of the heat exchange plate, the side facing the pipe member, and the side facing the cold storage member, along the surface direction of the heat exchange plate A regenerative heat exchanger having a flow path formed so that air flows.

(2) The regenerative heat exchanger according to (1), wherein the heat exchange plate is a corrugated plate having a wavy shape, and the flow path is provided between the wavy portions.

(3) The heat exchange plate has a configuration in which a plurality of protrusions extending along the surface direction are arranged in parallel with each other, and the flow path is provided between adjacent protrusions. The regenerative heat exchanger according to the above (1).

(4) The regenerative heat exchanger according to (1), wherein one or more pipe members, a heat exchange plate, and a regenerative member are sequentially stacked.

(5) The regenerative heat exchanger according to (4), wherein a plurality of pipe members are further arranged on a side of the regenerative member opposite the side facing the heat exchange plate.

(6) The regenerative heat exchanger according to (4), wherein the heat exchange plate and the regenerative member are further superposed in order on the opposite side of the regenerative member facing the heat exchange plate. .

(7) A part of the plurality of tube members forms a cooling pipe for cooling the regenerative member, and the other tube member exchanges heat with the cooled regenerative member to cool and cool. (1) The regenerative heat exchanger according to the above (1), wherein the heat exchanger is provided with a cooling line for taking out the heat.

(8) The regenerative heat exchanger according to the above (1), further comprising a blowing means for allowing air to flow through the flow path of the heat exchange plate.

[0015]

As described above, the regenerative heat exchanger of the present invention is provided with a heat exchange plate provided with a flow path for flowing air for cooling. Therefore, a sufficient amount of cooling air can be secured, and the heat exchange rate between the cooling air and the cold storage material can be increased. That is, according to the present invention, it is possible to improve the cooling efficiency of the regenerative heat exchanger.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a view showing an example of the regenerative heat exchanger of the present invention, wherein FIG. 1 (a) is a plan view and FIG. 1 (b) is a side view. As shown in the example of FIG. 1, the regenerative heat exchanger 1 of the present invention
0 denotes one or more pipe members (1a to 1d) and the heat exchange plate 2
And a cold storage member 6 containing a cold storage material (not shown) in the wrapping member 5 at least.
The longitudinal direction of the pipe members (1a to 1d) is parallel to the surface direction of the heat exchange plate 2. The heat exchange plate 2 is configured to allow air to flow along the surface direction of the heat exchange plate 2 to at least one of the inside of the heat exchange plate 2, the side facing the pipe member, and the side facing the cold storage member. It has a formed flow path 3. In the present invention, the surface direction of the heat exchange plate 2 is defined as the heat exchange plate 2.
The direction of spread.

In the example of FIG. 1, the tube members (1a to 1d), the heat exchange plate 2, and the cold storage member 6 are stacked in this order, and are in contact with each other. In addition, the structure in which the pipe member, the heat exchanger, and the cold storage member according to the present invention are stacked,
It is not limited to such an aspect in which they are in contact with each other. Also, the order of stacking is not limited, and a structure in which a tube member, a cold storage member, and a heat exchange plate are stacked in this order, or a tube member, a cold storage member, a heat exchange plate, and a cold storage member as shown in FIG. And a pipe member may be stacked in this order.

In the example shown in FIG. 1, the heat exchange plate 2 is a corrugated plate having a corrugated form, and is provided between the corrugated portions 4a and 4a in contact with the cold storage member 6 and between the pipe members (1a to 1d). The flow path 3 is formed between the corrugated portions 4b and 4b in contact with each other. The air sent by the blowing means (not shown) flows as shown by the arrows, and the cold stored in the cold storage member 6 is efficiently sent to the space to be cooled.

The cross section of the wavy portion (4a, 4b) has a rectangular shape, and the wavy portion (4a, 4b) comes into contact with the cold storage member 6 and the pipe members (1a to 1d) at the top formed flat. I have. The shape (ie, waveform) of the wavy portion (4a, 4b)
Is not particularly limited in the present invention, and may be any shape as long as the flow path 3 for sending necessary air can be formed.
For example, a shape that draws a sine curve or a cosine curve, a semicircular shape, and the like can be given. In setting the pitch of the wavy portion, it is necessary to consider that the flow path 3 is blocked by frost if it is too narrow, and that the heat exchange rate decreases if it is too wide. Further, each wavy portion may have a different shape and size (excluding height).

In a mode in which the cold storage member 6 is cooled via the heat exchange plate 2 as in the cold storage type heat exchanger 10, the shape of the heat exchange plate 2 (shape of the corrugated portion, pitch thereof, etc.)
The area of the portion of the heat exchange plate 2 that is in contact with the cold storage member 6 (the sum of the areas of the tops of the corrugated portions 4a that are in contact with the cold storage member 6) is equal to the area of the portion of the cold storage member 6 that faces the heat exchange plate 2. The area is set to be 50% to 100%, preferably 80% to 100%. In this case, the temperature distribution of the cold storage member during cold storage can be made uniform, and output fluctuations of the cold storage and cooling system can be suppressed.

The height of the corrugated portions (4a, 4b) may be appropriately determined in consideration of the pitch between the pipe members, the thickness of the cold storage member 6, and the like. Specifically, the inner diameter of the pipe member is 6 mm to 15 mm.
mm, the pitch between the pipe members is 20 mm to 30 mm, and the thickness of the cold storage member is 5 mm to 10 mm, the height of the wavy portion (the distance between the top of the wavy portion 4a and the top of the wavy portion 4b in FIG. 1). Is preferably 5 mm to 15 mm.

In the example of FIG. 1, each pipe member (1a to 1d)
Is installed such that its longitudinal direction is parallel to the traveling direction of the wavy portion. In the case of such installation, it is possible to avoid a situation in which air from the blowing means interferes with a member for supporting the pipe members (1a to 1d).

The pipe members 1 a and 1 c of the plurality of pipe members (1 a to 1 d) form a cooling pipe for cooling the cold storage member 6. The cooling pipeline branches from a refrigerant pipe that connects the condenser and the expansion valve that constitute the refrigerator, and joins the refrigerant pipe that connects the evaporator and the compressor. Therefore, the pipe member 1a
And 1c, a cooled refrigerant is flown to cool and solidify (cool storage) the cold storage member. In addition, a refrigerator, a condenser, an expansion valve,
The evaporator, compressor and refrigerant piping are not shown.

The pipe members 1b and 1d form a cooling discharge pipe for taking out cold heat by exchanging heat with the cooled regenerative member. The cooling passage is branched from a refrigerant pipe connecting the condenser constituting the refrigerator and the expansion valve, and joins the refrigerant pipe connecting the expansion valve and the evaporator. Accordingly, the refrigerant having a higher temperature than the cold storage member that has stored cold flows through the pipe members 1b and 1d, and the cold heat stored by the refrigerant supercooling method is extracted.

Further, in the example shown in FIG. 1, a plurality of pipe members (7a to 7a) are also provided on the side of the cold storage member 6 opposite to the side facing the heat exchange plate 2.
7d) is arranged. Multiple pipe members (7a to 7d)
Among them, the pipe members 7a and 7c form a cooling pipe like the pipe members 1a and 1c. The pipe members 7b and 7d form a cooling passage like the pipe members 1b and 1d.

As described above, the regenerative heat exchanger 10 shown in FIG.
Then, the cold heat stored by cooling and solidifying the cold storage member is sent to the space to be cooled by the air sent from the blower.
Further, the stored cold heat is carried to the evaporator of the refrigerator by the refrigerant flowing through the cooling passage, and is also sent from the evaporator to the space to be cooled. That is, in the regenerative cooling system using the regenerative heat exchanger 10, it is also possible to perform cooling by a refrigerant supercooling method for cooling the space to be cooled by improving the capacity of the evaporator. Cooling by the refrigerant supercooling method is excellent in rapid cooling capacity, and is effective when it is desired to minimize the temperature rise of the object to be cooled.

FIGS. 2A and 2B show another example of the regenerative heat exchanger of the present invention. FIG. 2A is a plan view and FIG. 2B is a side view. In the example of FIG. 2, the regenerative heat exchanger 20 has a structure in which tube members (1a to 1d), a regenerative member 6, a heat exchange plate 2, a regenerative member 16, and a tube member (7a to 7d) are sequentially stacked. ing. The heat exchange plate 2 has a form in which a plurality of convex portions 8 extending along the surface direction are arranged in parallel with each other. The flow path 3 formed so that air flows along the surface direction of the heat exchange plate 2 between the adjacent protrusions 8. Further, a through-hole 13 is provided inside the projection 8 from one end to the other end,
This through-hole 13 is also a channel similar to the channel 3.

Therefore, the air sent by the blower (not shown) flows as shown by the arrow, and the cold stored in the cold storage member 6 can be efficiently sent to the space to be cooled.
In FIG. 2, the convex portion 8 has a shape that draws a straight line connecting one end of the heat exchange plate 2 to the opposite end.
The present invention is not limited to this, and may have a shape that draws a curve.

Further, in the example of FIG. 2, the cross section perpendicular to the longitudinal direction of the projection 8 has a rectangular shape. The convex portion is in contact with the cold storage member 16 at the top formed in a planar shape. Convex part 8
The shape of the cross section perpendicular to the longitudinal direction is not particularly limited, and may be any shape as long as the flow path 3 for sending necessary air can be formed. For example, a shape formed by combining a semicircular shape, a trapezoidal shape, and a bow shape into a rectangle at a straight line portion, and the like. Convex part 8
As in the example of FIG. 1, it is necessary to take into consideration that the flow path 3 is blocked by frost if it is too narrow, and that the heat exchange rate decreases if it is too wide.

The height of the projection 8 may be determined as appropriate in consideration of the pitch between the pipe members, the thickness of the cold storage member 6, and the like. Specifically, the inner diameter of the tube member is 6 mm to 15 mm, the pitch between the tube members is 20 mm to 30 mm, and the thickness of the cold storage member is 5 mm.
In the case of 10 mm to 10 mm, the height of the convex portion (corresponding to the depth of the flow path 3 in FIG. 2) is 5 mm to 15 mm, preferably 7 mm.
mm to 12 mm.

Thus, the two cold storage members (6, 16)
Between the heat exchange plate 2 in which the flow path 3 and the through hole 13 are formed
Is arranged, the use of the regenerative heat exchanger 20 can also improve the cooling efficiency as compared with the related art. In the example of FIG. 2, all the pipe members (1a to 1a)
d and 7a to 7d) form a cooling conduit.

The heat exchange plate used in the present invention is shown in FIGS.
However, the present invention is not particularly limited as long as it has a flow path formed so that air flows along the surface direction. Examples of the material constituting the heat exchange plate include aluminum, copper, copper alloy, and steel. Of these, aluminum is preferably used because of its excellent thermal conductivity and light weight.

FIG. 3 is a perspective view showing another example of the heat exchange plate used in the regenerative heat exchanger of the present invention. In the example of FIG. 3, the flow path 31 for flowing the air is provided only inside the heat exchange plate 30. Heat exchange plate 30
Are formed in a planar shape. Therefore, if the heat exchange plate 30 is used in the example of FIG. 1, the contact area between the heat exchange plate 30 and the cold storage member can be made close to 100% of the area of the portion of the cold storage member facing the heat exchange plate 30. Therefore, the temperature distribution of the cold storage member can be made more uniform.

The tube member used in the regenerative heat exchanger of the present invention is not particularly limited as long as it can send a refrigerant. The plurality of pipe members referred to in the present invention is not limited to the case where there are a plurality of independent members as shown in the example of FIG. 1. For example, a single long tube is bent at one or two or more locations to meander. In this case, the portion other than the bent portion is also referred to. Specifications such as the number, inner diameter, and length of pipe members
What is necessary is just to determine suitably according to various conditions, such as the capacity | capacitance required for the regenerative heat exchanger of this invention, a cold storage time, and a cooling time.
Examples of the material constituting the pipe member include metal materials such as copper, copper alloy, aluminum and steel, and polymer materials such as polyethylene. Among them, it is preferable to use copper from the viewpoint of excellent workability and thermal conductivity.

In the present invention, as shown in FIG. 1, the pipe member is used not only as a cooling pipe for cooling the regenerative member, but also as a cooling pipe for exchanging heat with the cooled regenerative member and extracting cold heat. It can also be used as a pipeline. In addition, all the pipe members are connected in series to form one pipe, and a valve for switching the flow path is provided at the inlet and the outlet of the pipe, and the pipe is opened or closed to cool or discharge the pipe. It may be used for cooling. The pipe member may have a form in which a plurality of pipes are branched from one pipe.

The cold storage member used in the present invention may be any one in which a cold storage material is contained in a wrapping member. The shape of the cold storage member is such that the shape change due to expansion or the like of the cold storage material does not have a physical (mechanical) adverse effect on the wrapping member or the tube member, and therefore, the heat storage member has a heat-like shape such as a plate shape shown in FIGS. It is preferable that the shape be such that it can be placed vertically above the exchange plate. The cold storage material may be any material that can store cold, and those that have been conventionally used and those that will be developed in the future can be used. Specific examples include water, inorganic hydrate salts, salt water, and organic substances such as ethylene glycol.

The wrapping member is not particularly limited as long as it can accommodate the cold storage material without leaking, but is preferably formed of a flexible material. As a material for forming the wrapping member, for example, polyethylene, nylon, polypropylene, polyvinyl chloride,
Examples thereof include polystyrene, polyvinyl alcohol, and composite materials of these polymer materials and metals such as aluminum. Among them, a composite material is preferable because of its excellent cold resistance, water resistance and thermal conductivity. Specific examples of the composite material include those formed by laminating a nylon or polyethylene terephthalate film, an aluminum foil, a nylon film, and a polyethylene film in this order. Although the shape of the wrapping member is not particularly limited, it is preferable that the shape of the regenerative member be a plate as described above when the regenerative member is formed.

[0038] The regenerative heat exchanger of the present invention is preferably provided with a blowing means. The blower is not particularly limited as long as it can flow air through the flow path of the heat exchange plate, and a conventionally used blower can be used.
Specific examples include a centrifugal blower such as a multiblade blower and a tube flow blower, a propeller-type or tube-type axial flow blower, a mixed flow blower, and a cross flow blower. The capacity required for the blowing means is not particularly limited, and may be appropriately determined according to the size of the space to be cooled.

The regenerative heat exchanger of the present invention may be used for any purpose. Specifically, a regenerative cooling system used for refrigerators, freezers, cool storages, and the like can be mainly used.

[0040]

EXAMPLES The present invention will be specifically described below with reference to examples. Actually, a regenerative heat exchanger similar to that shown in FIG. 1 was manufactured.

Example 1 [Preparation of a regenerative heat exchanger] A heat exchange plate was formed by bending a flat plate of aluminum having a thickness of 1 mm, a size of 375 mm × 400 mm and a material similar to that of FIG. The wavy portion was set to a height of 5 mm, a width of 25 mm, and a pitch of 25 mm.

As a cooling pipe, a copper pipe member having an outer diameter of 15.9 mm, an inner diameter of 13.5 mm and a length of 1250 mm was used.
0 were prepared. As a cooling line arranged in parallel with the cooling line, an outer diameter of 9.5 mm, an inner diameter of 7.9 mm, and a length of 12 are provided.
Seventy 50 mm copper tube members were prepared. The pipe member to be a cooling pipe and the pipe member to be a cooling line are:
They are arranged parallel to each other and alternately.

The cold storage member is a rectangular wrapping member (size: 405 mm × 2) made of an aluminum foil composite material having a thickness of 0.9 mm.
30 mm) with a cold storage material. The size of the cold storage member was 405 mm × 230 mm and the thickness was 7 mm.
Met. The total weight of the cold storage material used was 140 kg.

The tube member, heat exchange plate and regenerative member obtained above were overlaid as shown in FIG. 1 to complete the regenerative heat exchanger of the present invention. The area (448 cm ² ) of the portion where the heat exchange plate is in contact with the cold storage member is 5 times the area (840 cm ² ) of the portion where the cold storage member faces the heat exchange plate.
It was 3.3%. Further, this regenerative heat exchanger was connected to a refrigerator (compressor capacity: displacement 15.8 m ³ / h,
(Refrigeration capacity per day: 6308 Kcal / h (1.9 legal tons)) to configure a regenerative cooling system.

[Evaluation] The obtained regenerative heat exchanger was placed in a refrigerator having a volume of 35.4 m ³ and a temperature of −20 ° C.
A refrigerant at −30 ° C. was passed through the cooling pipe to completely solidify the cold storage material. Next, the refrigerant was supercooled by flowing the refrigerant through the cooling line, and the inside of the freezer was cooled by flowing the refrigerant into the evaporator. As a result, it took about 1.5 hours to reduce the temperature in the refrigerator to −20 ° C. On the other hand, when the inside of the freezer was cooled using the regenerative heat exchanger shown in FIG. 4 having the same weight and the same kind of cold storage material, it was necessary to lower the temperature in the freezer to −20 ° C. The time was about 1.7 hours.

Example 2 Outer diameter 12.7 mm, inner diameter 10.7 mm, length 1350 m
A regenerative heat exchanger was produced in the same manner as in Example 1 except that a copper pipe member (96 pieces) of m was used as a cooling pipe and a cooling pipe was not provided. Further, this regenerative heat exchanger was connected to a refrigerator and installed in a freezer as in Example 1, and a refrigerant at −30 ° C. was passed through a cooling pipe to completely solidify the regenerator material. Next, a blower (blower output 0.1 k
When a propeller axial flow blower with an air flow rate of 30 m ³ / min) was operated, the time required for maintaining the inside of the freezer at a temperature of −20 ° C. at the set temperature range of 4 ° C. was about 3.5 hours. Was.

From Examples 1 and 2, it can be confirmed that the use of the regenerative heat exchanger of the present invention can increase the cooling efficiency.

[0048]

As described above, according to the present invention, the cooling efficiency of the regenerative heat exchanger can be improved. Therefore, the regenerative cooling system using the regenerative heat exchanger of the present invention can reduce the power consumption during the cooling operation, and can further contribute to suppressing the peak power demand.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a regenerative heat exchanger of the present invention.

FIG. 2 is a diagram showing another example of the regenerative heat exchanger of the present invention.

FIG. 3 is a view showing another example of the heat exchange plate used in the regenerative heat exchanger of the present invention.

FIG. 4 is a view showing a conventional regenerative heat exchanger.

[Explanation of symbols]

 1a to 1d tube member 2 heat exchange plate 3 flow path 4a, 4b wavy portion 5 wrapping member 6 cold storage member 10 cold storage type heat exchanger

Claims (8)

[Claims] 1. A method according to claim 1, wherein one or more pipe members, a heat exchange plate, and a cold storage member having a wrapping member containing a cold storage material have a longitudinal direction of said pipe member parallel to a surface direction of said heat exchange plate. At least one of the inside of the heat exchange plate, the side facing the tube member, and the side facing the cold storage member, in the surface direction of the heat exchange plate. A regenerative heat exchanger having a flow path formed so that air flows along the heat exchanger. 2. The regenerative heat exchanger according to claim 1, wherein the heat exchange plate is a corrugated plate having a wavy shape, and the flow path is provided between the wavy portions. 3. The heat exchange plate has a configuration in which a plurality of protrusions extending along a surface direction thereof are arranged in parallel with each other, and a space between adjacent protrusions is defined by the flow path. The regenerative heat exchanger according to claim 1, wherein 4. The regenerative heat exchanger according to claim 1, wherein one or more pipe members, a heat exchange plate, and a regenerative member are sequentially stacked. 5. The regenerative heat exchanger according to claim 4, further comprising a plurality of pipe members disposed on a side of the regenerative member opposite to a side facing the heat exchange plate. 6. The regenerative heat exchanger according to claim 4, wherein the heat exchange plate and the regenerative member are sequentially superimposed on a side of the regenerative member opposite to a side facing the heat exchange plate. 7. A part of the plurality of pipe members forms a cooling pipe for cooling the cold storage member, and the other pipe members exchange heat with the cooled cold storage member to generate cold heat. The regenerative heat exchanger according to claim 1, wherein a cooling passage is formed for taking out the heat. 8. The regenerative heat exchanger according to claim 1, further comprising a blowing means for allowing air to flow through the flow path of the heat exchange plate.