JP2017116195A - Evaporator with cold storage function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an evaporator with cold storage function, capable of extending a cooling time while suppressing reduction in a cooling performance at the time of normal cooling.SOLUTION: Cold storage material containers 15 are arranged in one gap 14A of whole gaps 14A, 14B and 14C between adjacent refrigerant flow pipes 12 in a heat exchange core part of an evaporator with cold storage function, and outer fins 16 and 17 are arranged in the remaining gaps 14B and 14C so that three or more outer fins 16 and 17 are provided between the adjacent cold storage material containers 15. All the gaps 14A, 14B and 14C comprise the first gap 14A arranged with the cold storage material container 15, the second gap 14B adjacent to both right and left sides of the first gap 14A, and arranged with the first outer fins 16, and the remaining third gap 14C arranged with the second outer fins 17. Fin pitches P1 and P2 of the first and second outer fins 16 and 17 are equalized in the whole in the vertical direction, and the fin pitch P1 between the first outer fins 16 is made wider than the fin pitch P2 between the second outer fins 17.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an evaporator with a cold storage function used in a car air conditioner of a vehicle that temporarily stops an engine that is a drive source of a compressor when the vehicle is stopped.

  In this specification and claims, the top and bottom, left and right (up and down, left and right in FIGS. 1 to 3) viewed from the upstream side in the ventilation direction indicated by the arrow X in FIG.

  In addition, in this specification and claims, the fin pitch of the outer fins means the interval between wave crest portions adjacent to each other in the vertical direction or the interval between wave bottom portions.

  In recent years, automobiles have been proposed that automatically stop the engine when the vehicle stops, such as when waiting for a signal, for the purpose of environmental protection or improvement in automobile fuel efficiency.

  However, in a normal car air conditioner, when the engine is stopped, the compressor using the engine as a driving source stops, so that there is a problem that the refrigerant is not supplied to the evaporator and the cooling capacity is rapidly reduced.

  Therefore, in order to solve such problems, the evaporator is provided with a cold storage function, and when the engine stops and the compressor stops, the cold stored in the evaporator is discharged to cool the vehicle interior. Is considered.

  As an evaporator with this kind of cool storage function, a plurality of flat refrigerant flow pipes whose longitudinal direction is directed vertically and the width direction is directed to the ventilation direction, a cool storage material container enclosing the cool storage material, and a wave extending in the ventilation direction A heat exchanging core portion having a top portion, a wave bottom portion extending in a ventilation direction, and a corrugated outer fin composed of a connecting portion connecting the wave top portion and the wave bottom portion. Are arranged at intervals in the left-right direction, so that a gap is formed between the refrigerant flow pipes adjacent in the left-right direction, and the cool storage material container is a part of the whole gap and a plurality of gaps. The outer fins are arranged so as to contact the refrigerant circulation pipe, and the outer fins are arranged so as to be in contact with the refrigerant circulation pipe in the plurality of gaps remaining in the entire gap, and the fin pitches of all the outer fins are equal. Kuna' in which the evaporator with a cool storage function has been proposed (see Patent Document 1).

  According to the evaporator with a cold storage function described in Patent Document 1, during normal cooling when the compressor is operating, the cold heat of the refrigerant flowing in the refrigerant flow pipe is transferred from both side walls of the cold storage material container to the cold storage material in the cold storage material container. The cold energy is stored in the cold storage material. On the other hand, when the compressor is stopped, the cold energy stored in the regenerator material in the regenerator material container is transmitted to the refrigerant distribution pipe via the both side walls of the regenerator material container, and the regenerator material container passes through the refrigerant distribution pipe. It is transmitted to the outer fins arranged in the gaps adjacent to the arranged gaps, and is cooled by the air flowing through the gaps from the outer fins.

  By the way, in the evaporator with a cool storage function described in Patent Document 1, it is effective to increase the heat transfer area of the outer fins by narrowing the fin pitch of all the outer fins in order to improve the cooling performance during normal cooling. However, in this case, there is a possibility that the ventilation resistance becomes high and the cooling rate to the air at the time of cooling is increased and the cooling time is shortened.

JP 2010-91250 A

  The objective of this invention is providing the evaporator with a cool storage function which can extend the cool-down time, solving the said problem and suppressing the fall of the cooling performance at the time of normal cooling.

  In order to achieve the above object, the present invention comprises the following aspects.

1) A plurality of flat refrigerant flow pipes with the longitudinal direction oriented in the vertical direction and the width direction directed in the ventilation direction, a cool storage material container enclosing the cool storage material, a wave top extending in the ventilation direction, and a wave extending in the ventilation direction A heat exchanging core portion having a corrugated outer fin composed of a bottom portion and a connecting portion that connects the wave crest portion and the wave bottom portion. In the heat exchange core portion, a plurality of refrigerant flow pipes are spaced apart in the left-right direction. And a plurality of gaps are formed between the refrigerant flow pipes adjacent in the left-right direction so that the cool storage material container is in contact with the refrigerant flow pipe at a part of the total gap and the plurality of gaps. An evaporator with a cold storage function that is disposed so that the outer fin is in contact with the refrigerant flow pipe in a plurality of gaps that are the remainder of the entire gap,
Three or more outer fins are disposed between the regenerator containers adjacent in the left-right direction, and the entire gap formed between the refrigerant flow pipes adjacent in the left-right direction is the first gap in which the regenerator container is disposed. A second gap that is adjacent to the left and right sides of the first gap and in which the first outer fin is disposed, and a remaining gap excluding the first and second gaps of the entire gap, and the second outer fin is The fin pitch of the second outer fins arranged in the third gap is uniform throughout the vertical direction, and at least one of the second gaps on both sides of the first gap. The cold storage in which the fin pitch of the portion located in the range of at least a constant height of the total height of the cold storage material container in the first outer fin arranged in the second gap is wider than the fin pitch of the second outer fin. Ability with the evaporator.

  In the evaporator with a cool storage function of 1) above, at least a constant height of the total height of the cool storage material container in the first outer fin disposed in at least one of the second gaps on both sides of the first gap. The reason why the fin pitch of the portion located within the range is made wider than the fin pitch of the second outer fin is as follows. That is, widening the fin pitch of the first outer fin disposed in at least one of the second gaps on both sides of the first gap means that the heat transfer area of the part is reduced. It is possible to extend the cooling time from the first outer fin to the air passing through the second gap during cooling. However, the cooling time can be extended without necessarily increasing the overall fin pitch of the first outer fin. Therefore, the portion located in the range of at least a constant height of the total height of the cool storage material container in the first outer fin disposed in at least one of the second gaps on both sides of the first gap is , A part that can effectively extend the cooling time, and preferably a part that is located within a range of at least 40% of the total height of the cool storage material container.

  2) The fin pitch of the first outer fin arranged in at least one of the second gaps on both sides of the first gap is uniform in the vertical direction and the fin pitch of the second outer fin. The heat storage area according to 1), wherein the heat transfer area of the first outer fin, which is wider than the fin pitch of the second outer fin, is smaller than the heat transfer area of the second outer fin. Evaporator with function.

  3) The first outer fin disposed in at least one of the second gaps on both sides of the first gap has a portion where the fin pitch is wider and narrower than the fin pitch of the second outer fin. The above 1), wherein a portion where the fin pitch of the first outer fin is wider than the fin pitch of the second outer fin is located within a range of at least a constant height of the total height of the cold storage material container. Evaporator with cold storage function.

  4) The heat transfer area of the first outer fin in which the fin pitch is wider and narrower than the fin pitch of the second outer fin is equal to the heat transfer area of the second outer fin. 3) Evaporator with cool storage function.

  According to the evaporator with a cool storage function of 1) to 4) above, three or more outer fins are arranged between the cool storage material containers adjacent in the left-right direction, and are formed between the refrigerant flow pipes adjacent in the left-right direction. The entire gap includes a first gap in which the cool storage material container is disposed, a second gap in which the first outer fin is disposed adjacent to the left and right sides of the first gap, and the first and second gaps among the entire gap. And the third gap in which the second outer fin is arranged, and the fin pitch of the second outer fin arranged in the third gap is uniform in the entire vertical direction. The fin pitch of the portion located within the range of at least a constant height of the total height of the cold storage material container in the first outer fin disposed in at least one of the second gaps on both sides of the one gap, 2nd outer Since it is wider than the fin pitch of the fin, the range of the constant height of the cold storage material container in the first outer fin disposed in at least one of the second gaps on both sides of the first gap. The heat transfer area of the part located inside becomes smaller than the heat transfer area of the 2nd outer fin in the same height range as the said part. Therefore, for example, when the fin pitch of the second outer fin is made equal to the fin pitch of the outer fin of the evaporator with the cool storage function described in Patent Document 1, the cool storage material container at the time of cooling from the cool storage material in the cool storage material container is arranged. The cool storage material container in the evaporator with the cool storage function described in Patent Document 1 arranges the cooling time from the first outer fin arranged in at least one of the second gaps on both sides of the first gap. The cooling time can be extended as compared with the cooling time from the outer fin arranged in the gap adjacent to the gap. Moreover, the cooling performance with respect to the air passing through the third gap is equivalent to the cooling performance with respect to the air passing through the gap in which the outer fin is arranged in the evaporator with the cold storage function described in Patent Document 1, so that cooling during normal cooling is performed. A decrease in performance can be suppressed.

  According to the evaporator with a cold storage function of 2) above, the fin pitch of the portion of the first outer fin located within a range of at least a constant height of the total height of the cold storage material container in the first outer fin is set to the second outer fin. It can be made wider than the fin pitch.

  According to the evaporator with the cold storage function of 3) above, the fin pitch of the portion located within a range of at least a constant height of the total height of the cold storage material container in the first outer fin is set with a simple configuration. It can be made wider than the fin pitch.

  According to the evaporator with a cool storage function of 4) above, the cooling performance for the air passing through the second gap is equal to the cooling performance for the air passing through the third gap, so that the cooling performance during normal cooling is reduced. Can be suppressed. In addition, the corrugated fin, which has the same fin pitch as a whole, is partially extended or contracted, so that the portion having a fin pitch wider than the fin pitch of the second outer fin and the portion having a narrow fin pitch are used. It becomes possible to make the 1st outer fin which becomes. For example, the second outer fin can be used as a semi-finished product for making the first outer fin, and the manufacturing cost can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway perspective view showing an overall configuration of an evaporator with a cold storage function of the present invention. It is a partial enlarged front view of the evaporator with a cool storage function of FIG. It is a figure equivalent to the partial expanded front view of the evaporator with a cool storage function of FIG. 1 which shows the modification of the 1st outer fin arrange | positioned in the 2nd clearance gap.

  Embodiments of the present invention will be described below with reference to the drawings.

  In the following description, the term “aluminum” includes aluminum alloys in addition to pure aluminum.

  FIG. 1 shows the overall configuration of an evaporator with a cold storage function according to the present invention, and FIG. 2 shows the configuration of the main part thereof.

  In FIG. 1 and FIG. 2, the evaporator with a cold storage function (1) is an aluminum upper header tank (with an interval in the vertical direction with the longitudinal direction facing the left and right direction and the width direction facing the ventilation direction) 2) and an aluminum lower header tank (3), and a heat exchange core section (4) provided between the header tanks (2) and (3).

  The upper header tank (2) includes a leeward upper header portion (5) located on the leeward side and an upwind header portion (6) located on the leeward side and integrated with the leeward upper header portion (5). And. A refrigerant inlet (7) is provided at the right end of the leeward upper header (5), and a refrigerant outlet (8) is provided at the right end of the leeward upper header (6). The lower header tank (3) includes a leeward lower header portion (9) located on the leeward side and an upwind lower header portion (11) located on the leeward side and integrated with the leeward lower header portion (9). And.

  In the heat exchange core section (4), between the windward upper header section (6) and the windward lower header section (11) and between the leeward upper header section (5) and the leeward lower header section (9). In between, a plurality of aluminum flat refrigerant flow pipes (12) each having a longitudinal direction directed in the up-down direction and a width direction directed in the wind direction are arranged at intervals in the left-right direction, and are arranged on the windward side. The upper end of the refrigerant flow pipe (12) is connected to the upwind header section (6), and the lower end is connected to the upwind lower header section (11), and the refrigerant flow pipe (12 ) Is connected to the leeward upper header (5), and the lower end is connected to the leeward lower header (9). The refrigerant flow pipe (12) between the leeward upper header part (5) and the leeward lower header part (9) is not shown. The refrigerant flow pipe (12) arranged on the leeward side and the refrigerant flow pipe (12) arranged on the leeward side are in the same position in the left-right direction, and the pipe assembly (2) is arranged by two refrigerant flow pipes (12) arranged in the ventilation direction ( 13) is formed, and gaps (14A), (14B), and (14C) are formed between the pipe assemblies (13) adjacent in the left-right direction.

  Aluminum regenerator container (15) in which a regenerator material is enclosed in a part of the total gap (14A) (14B) (14C) and a plurality of gaps (14A) in the heat exchange core part (4) Are arranged in contact with the refrigerant flow pipe (12), and a plurality of gaps (14B) (14C), which are the remainder of all the gaps (14A), (14B), (14C), are provided with corrugated aluminum first outer fins ( 16) or a corrugated aluminum second outer fin (17) is arranged in contact with the refrigerant flow pipe (12). Three or more outer fins, that is, two first outer fins (16) and one or more second outer fins (17) are arranged between the cold storage material containers (15) adjacent in the left-right direction. The total gaps (14A), (14B), and (14C) are adjacent to the first gap (14A) in which the cool storage material container (15) is disposed, the left and right sides of the first gap (14A), and the first outer fins (16 ) In which the first and second gaps (14A) and (14B) are removed from the total gaps (14A), (14B) and (14C), and the second gap (14B). And a third gap (14C) in which the second outer fin (17) is disposed. In addition, the second outer fin (17) is arranged outside the pipe assembly (13) at both the left and right ends so as to straddle the two refrigerant circulation pipes (12) constituting the pipe assembly (13). An aluminum side plate (18) is disposed outside the second outer fins (17) at the left and right ends and brazed to the second outer fins (17).

  The cool storage material container (15) is a flat and hollow shape having a substantially vertical rectangular shape with the longitudinal direction facing the vertical direction and the width direction facing the ventilation direction. The first gap (14A) has both the left and right sides of the first gap (14A). It arrange | positions so that two refrigerant | coolant flow pipes (12) which comprise this pipe | tube set (13) may be straddled, and it is brazed to both refrigerant | coolant flow pipes (12).

  The first outer fin (16) and the second outer fin (17) are respectively crests (16a) (17a) extending in the ventilation direction, crests (16b) (17b) extending in the ventilation direction, and crests (16a). (17a) and wave bottom portions (16b) and (17b) are connected to each other (16c) and (17c). The second gap (14B) and the third gap (14C) are connected to the second gap (14B) and the second gap (14B). It arrange | positions so that it may straddle the two refrigerant | coolant flow pipes (12) which comprise the pipe | tube set (13) of the right-and-left both sides of 3 gaps (14C), and is brazed to both refrigerant | coolant flow pipes (12).

  The fin pitch (P1) of the first outer fin (16) and the fin pitch (P2) of the second outer fin (17) are uniform in the entire vertical direction. Further, the portion of the first outer fin (16) located within the range of at least 40% of the total height of the cold storage container (15), here, the fin pitch (P1) of the entire first outer fin (16) is the second. It is wider than the fin pitch (P2) of the outer fin (17), and the heat transfer area of the first outer fin (16) is smaller than the heat transfer area of the second outer fin (17).

  In the case of the evaporator (1) of this embodiment, the refrigerant passes through the refrigerant inlet (7) and enters the leeward upper header portion (5) of the evaporator (1) and passes through the entire refrigerant circulation pipe (12). It flows out from the refrigerant outlet (8) of the upper upper header section (6).

  The evaporator with a cold storage function (1) described above includes a compressor that uses a vehicle engine as a drive source, a condenser that cools the refrigerant discharged from the compressor (refrigerant cooler), and an expansion valve that depressurizes the refrigerant that has passed through the condenser ( A refrigeration cycle is configured together with a decompressor, and is mounted as a car air conditioner on a vehicle, such as an automobile, that temporarily stops an engine that is a drive source of a compressor when the vehicle is stopped. When the compressor is operating, the low-pressure gas-liquid mixed-phase two-phase refrigerant compressed by the compressor and passed through the condenser and the expansion valve passes through the refrigerant inlet (7) and the evaporator with the cold storage function (1) Enters the leeward upper header portion (5) and flows out from the refrigerant outlet (8) of the leeward upper header portion (6) through the entire refrigerant flow pipe (12). And while a refrigerant | coolant flows through the inside of a refrigerant | coolant distribution pipe | tube (12), it heat-exchanges with the air which passes the evaporator (1) with a cool storage function, and a refrigerant | coolant flows out in a gaseous phase. That is, the air passing through the second gap (14B) and the third gap (14C) flows into the refrigerant flow pipes (12) of the left and right pipe sets (13) constituting the second gap (14B) and the third gap (14C). ), And the air is supplied to the passenger compartment for cooling. At this time, since the heat transfer area of the second outer fin (17) is larger than the heat transfer area of the first outer fin (16), the cooling performance for the air passing through the third gap (14C) is This is superior to the cooling performance for the air passing through the second gap (14B). Further, during operation of the compressor, the cold heat of the refrigerant flowing in the refrigerant flow pipe (12) of the left and right pipe assemblies (13) constituting the first gap (14A) is converted into the cold storage material in the cold storage material container (15). The cold energy is stored in the cold storage material.

   When the compressor is stopped, the cold energy stored in the cool storage material in the cool storage material container (15) is transmitted to the refrigerant flow pipes (12) of the left and right pipe assemblies (13) constituting the first gap (14A), and It passes through the refrigerant flow pipe (12) and is transmitted to the first outer fin (16) arranged in the second gap (14B). The cold heat transmitted to the first outer fin (16) is transmitted from the first outer fin (16) to the air passing through the second gap (14B) to cool the air. Therefore, even if the temperature of the air that has passed through the evaporator (1) with a cold storage function rises, the air is cooled, so that a rapid decrease in the cooling capacity is prevented. Here, since the heat transfer area of the first outer fin (16) is smaller than the heat transfer area of the second outer fin (17), the fin pitch (P1) of the first outer fin (16) is set to the second. Cooling time from the first outer fin (16) to the air flowing through the second gap (14B) is longer than when the heat transfer area is made equal to the fin pitch (P2) of the outer fin (17). Become.

  FIG. 3 shows a modification of the first outer fin arranged in the second gap (14B) of the evaporator (1) with a cold storage function of FIG.

  In FIG. 3, the first outer fin (20) has a first portion (21) having a fin pitch (P3) wider than the fin pitch (P2) of the second outer fin (17) and a fin pitch (P4). A second portion (22) narrower than the fin pitch (P2) of the second outer fin (17) is provided. The first part (21) and the second part (22) are respectively crests (21a) (22a) extending in the ventilation direction, crests (21b) (22b) extending in the ventilation direction, and crests (21a) (22a) ) And the wave bottom portions (21b) and (22b) are connected to each other (21c) and (22c). The first portion (21) in which the fin pitch (P3) in the first outer fin (20) is wider than the fin pitch (P2) in the second outer fin (17) is at least of the total height of the regenerator container (15). It is located within a certain height, preferably within 40%. Further, the heat transfer area of the first outer fin (20) and the heat transfer area of the second outer fin (17) are equal.

  The first outer fin (20) has a fin pitch (P3) wider than the fin pitch (P2) of the second outer fin (17) by extending or shrinking the corrugated fin having the same fin pitch throughout. It is created by providing a first part (21) and a second part (22) having a narrow fin pitch (P4). For example, the second outer fin (17) can be used as a semi-finished product for producing the first outer fin (20), and the manufacturing cost can be reduced.

  In the case of the evaporator (1) with the cold storage function in which the first outer fin (20) is used, the second gap (14B) is operated in the same manner as the evaporator (1) with the cold storage function of the above-described embodiment when the compressor is operated. The air passing through the third gap (14C) is cooled by the refrigerant flowing through the refrigerant flow pipe (12) of the left and right pipe assemblies (13) constituting the second gap (14B) and the third gap (14C). As a result, this air is used for cooling the passenger compartment. At this time, since the heat transfer area of the first outer fin (16) and the heat transfer area of the second outer fin (17) are equal, the cooling performance for the air passing through the third gap (14C) is The cooling performance for air passing through the two gaps (14B) is equivalent, and the entire air passing through the evaporator with a cold storage function is cooled uniformly.

  When the compressor is stopped, the cold energy stored in the cold storage material in the cold storage material container (15) is transferred from the first outer fin (20) to the second gap in the same manner as the evaporator (1) with the cold storage function of the embodiment described above. The air passing through (14B) is transmitted to cool the air. At this time, the first portion (21) in which the fin pitch (P3) in the first outer fin (20) is wider than the fin pitch (P2) in the second outer fin (17) is the total height of the regenerator container (15). Since it is located within the range of at least 40%, the fin of the first outer fin (20) is arranged by arranging the first portion (21) in the portion where the air easily passes through the second gap (14B). Compared with the case where the pitch is made equal to the fin pitch (P2) of the second outer fin (17) and the heat transfer area is made equal, the cooling time for the air flowing through the second gap (14B) becomes longer.

  In the above-described embodiment, the whole or part of the fin pitch of the first outer fin (16) disposed in the second gap (14B) on both sides of the first gap (14A) is the second outer fin (17). Although it is wider than the fin pitch, it is not limited to this, and at least one of the second gaps (14B) on both sides of the first gap (14A) is disposed. The whole or a part of the fin pitch of the first outer fin (16) may be wider than the fin pitch of the second outer fin (17).

  The evaporator with a cold storage function according to the present invention is suitably used in a refrigeration cycle constituting a car air conditioner for a vehicle that temporarily stops an engine that is a drive source of a compressor when the vehicle is stopped.

(1): Evaporator with cool storage function
(12): Refrigerant distribution pipe
(13): Tube assembly (13)
(14A): 1st gap
(14B): Second gap
(14C): Third gap
(15): Cold storage container
(16): First outer fin
(16a): Wave peak
(16b): Wave bottom
(16c): Connection part
(17): Second outer fin
(17a): Wave peak
(17b): Wave bottom
(17c): Connection part
(20): First outer fin
(21): The first portion where the fin pitch is wider than the fin pitch of the second outer fin
(21a): Wave peak
(21b): Wave bottom
(21c): Connection part
(22): The second portion where the fin pitch is narrower than the fin pitch of the second outer fin.
(22a): Wave peak
(22b): Wave bottom
(22c): Connection part

Claims (4)

A plurality of flat refrigerant flow pipes whose longitudinal direction is directed in the vertical direction and the width direction is directed in the ventilation direction, a cold storage material container in which the cold storage material is enclosed, a wave top portion extending in the ventilation direction, a wave bottom portion extending in the ventilation direction, And a heat exchange core part having a corrugated outer fin composed of a connecting part that connects the wave crest part and the wave bottom part. In the heat exchange core part, a plurality of refrigerant flow pipes are spaced apart in the left-right direction. By arranging, a gap is formed between the refrigerant circulation pipes adjacent in the left-right direction, and the cool storage material container is arranged so as to be in contact with the refrigerant circulation pipe at a part of the whole gap and a plurality of gaps. An evaporator with a cold storage function, wherein the outer fin is disposed so as to be in contact with the refrigerant flow pipe in a plurality of gaps that are the remainder of the entire gap,
Three or more outer fins are disposed between the regenerator containers adjacent in the left-right direction, and the entire gap formed between the refrigerant flow pipes adjacent in the left-right direction is the first gap in which the regenerator container is disposed. A second gap that is adjacent to the left and right sides of the first gap and in which the first outer fin is disposed, and a remaining gap excluding the first and second gaps of the entire gap, and the second outer fin is The fin pitch of the second outer fins arranged in the third gap is uniform throughout the vertical direction, and at least one of the second gaps on both sides of the first gap. The cold storage in which the fin pitch of the portion located in the range of at least a constant height of the total height of the cold storage material container in the first outer fin arranged in the second gap is wider than the fin pitch of the second outer fin. Ability with the evaporator. The fin pitch of the first outer fins arranged in at least one of the second gaps on both sides of the first gap is uniform in the entire vertical direction and is larger than the fin pitch of the second outer fins. The heat transfer area of the first outer fin, which is wider and has a fin pitch larger than the fin pitch of the second outer fin, is smaller than the heat transfer area of the second outer fin. Evaporator. The first outer fin disposed in at least one of the second gaps on both sides of the first gap is provided with a portion where the fin pitch is wider and narrower than the fin pitch of the second outer fin. 2. The cold storage according to claim 1, wherein a portion where the fin pitch of the first outer fin is wider than the fin pitch of the second outer fin is located within a range of at least a constant height of the total height of the cold storage material container. Evaporator with function. The heat transfer area of the 1st outer fin in which the part where the fin pitch is wider than the fin pitch of a 2nd outer fin, and a narrow part is provided, and the heat transfer area of a 2nd outer fin are equal. Evaporator with cold storage function described.

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