JP2015137807A - Cold storage heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cold storage heat exchanger capable of suppressing generation of smell at an air temperature of a wide range, and further keeping a cold storage function.SOLUTION: A cold storage material 50 includes a material in which two kinds or more of ester compounds different in carbon numbers are mixed. The ester compound has a carbon number of 10-40, and is composed of one ester bond held between an alkyl group and a methyl group. In a case of one ester bond held by two alkyl groups, its melting point is 0°C or less, but by using the methyl group, the melting point can be increased to be higher than 0°C. Accordingly, a temperature range for freezing and melting the cold storage material 50 can be widened within a proper range.

Description

  The present invention relates to a cold storage heat exchanger used in a refrigeration cycle apparatus.

  In the vehicle air conditioner, the refrigeration cycle apparatus is driven by the traveling engine. For this reason, if the engine is stopped while the vehicle is temporarily stopped, the refrigeration cycle apparatus is stopped. In order to improve fuel efficiency, so-called idle stop vehicles that stop the engine while the vehicle is stopped, such as waiting for a signal, are increasing. In such an idle stop vehicle, there is a problem that the refrigeration cycle apparatus stops while the vehicle is stopped (the engine is stopped), thereby impairing the comfort in the passenger compartment. In addition, there is also a problem that if the engine is restarted even when the vehicle is stopped in order to maintain a feeling of air conditioning, improvement in fuel efficiency is hindered.

  A technique for solving such a problem is disclosed in Patent Document 1. In Patent Document 1, in order to maintain the air conditioning feeling even when the engine is stopped, the indoor heat exchanger has a cold storage function. Specifically, Patent Document 1 describes a cool storage container in which a cool storage material is enclosed and disposed behind the air flow of a conventional evaporator. Thus, cold energy is stored while the vehicle is running, and this cold air is used while the vehicle is stopped.

  Japanese Patent Application Laid-Open No. H10-228707 describes a small-capacity cold storage container provided adjacent to a tube constituting the refrigerant flow path of the evaporator, and encloses the cold storage material therein. Patent Document 3 discloses that normal paraffin having a stable solidification and melting characteristic for a long time and having a high latent heat is used as the cold storage material.

Special table 2009-526194 JP 2002-274165 A JP 2002-337537 A

  As a problem of the air conditioner at the time of idling stop, in addition to deterioration of the thermal feeling in the passenger compartment, generation of odor accompanying evaporation of condensed water adhering to the evaporator can be mentioned. This odor occurs when the temperature of the evaporator rises as the compressor stops during idle stop, and the temperature rises above the wet bulb temperature of the intake air. Therefore, if a regenerator material with a melting point lower than the wet bulb temperature of the intake air is used, the evaporator temperature can be maintained below the wet air bulb temperature of the intake air while the regenerator material is melting. it can.

  However, in the prior art, considering the maintenance of cooling feeling during idle stop, a cold storage material having a high melting point is used so that the cooling feeling can be maintained for a long time. Therefore, when the outside air temperature is below the melting point, for example, from the middle to winter, the temperature around the evaporator is below the melting point of the regenerator material, so the regenerator material is always solidified and cannot be melted, so the odor cannot be suppressed. .

  Accordingly, the present invention has been made in view of the above-described problems, and an object thereof is to provide a cold storage heat exchanger that can suppress the generation of odors in a wide range of air temperatures and can maintain the cold storage function. To do.

  The present invention employs the following technical means in order to achieve the aforementioned object.

  The present invention relates to a regenerative heat exchanger (40) for exchanging heat with air flowing around, a refrigerant passage (45a) through which refrigerant flows, and heat exchange with refrigerant flowing through the refrigerant passage from the refrigerant. A regenerator (47) that houses therein a regenerator (50, 50a, 50b) that retains heat, and the regenerator includes a material in which two or more ester compounds having different carbon numbers are mixed, The compound has a carbon number of 10 or more and 40 or less, and is composed of one ester bond sandwiched between an alkyl group and a methyl group.

  According to such this invention, a cool storage material contains the material with which 2 or more types of ester compounds from which carbon number differs were mixed. The ester compound has 10 to 40 carbon atoms and is composed of one ester bond sandwiched between an alkyl group and a methyl group. In the case of one ester bond sandwiched between two alkyl groups, the melting point becomes 0 ° C. or lower, but the melting point can be made higher than 0 ° C. by using a methyl group as described above. Therefore, the temperature range in which the regenerator material solidifies and melts can be widened in an appropriate range. Thereby, even if the temperature of air is low, the cool storage material can be melted and allowed to cool. Therefore, even when the temperature of the air is low, it is possible to maintain the temperature below the wet bulb temperature of the passing air, and the generation of odor accompanying the evaporation of the condensed water can be suppressed. Further, since the temperature range in which the cold storage material can store and cool is wide, the cold storage function can be maintained in a wider range of air temperatures.

  In addition, the code | symbol in the bracket | parenthesis of each above-mentioned means is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

It is a front view which shows the evaporator 40 of 1st Embodiment. It is a side view which shows the evaporator 40. FIG. It is an expanded sectional view which shows a part of III-III cross section of FIG. It is sectional drawing which expands and shows a part of evaporator 40B of 2nd Embodiment. It is sectional drawing which expands and shows a part of evaporator 40C of 3rd Embodiment.

  Hereinafter, a plurality of embodiments for carrying out the present invention will be described with reference to the drawings. In some embodiments, portions corresponding to the matters described in the preceding embodiments may be given the same reference numerals, or one letter may be added to the preceding reference numerals, and overlapping descriptions may be omitted. In addition, when a part of the configuration is described in each embodiment, the other parts of the configuration are the same as those of the embodiment described in advance. In addition to the combination of parts specifically described in each embodiment, the embodiments may be partially combined as long as the combination does not hinder the combination.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. The evaporator 40 constitutes a refrigeration cycle apparatus (not shown). The refrigeration cycle apparatus is used for, for example, a vehicle air conditioner. Although not shown, the refrigeration cycle apparatus includes a compressor, a radiator, a decompressor, and an evaporator 40. These components are connected in an annular shape by piping and constitute a refrigerant circulation path. The compressor is driven by a power source for running the vehicle. For this reason, when the power source stops, the compressor also stops. The compressor sucks the refrigerant from the evaporator 40, compresses it, and discharges it to the radiator. The radiator cools the high-temperature refrigerant. The radiator is also called a condenser. The decompressor decompresses the refrigerant cooled by the radiator. The decompressor can be provided by a fixed throttle, a temperature expansion valve, or an ejector. The evaporator 40 evaporates the refrigerant decompressed by the decompressor and cools the medium. The evaporator 40 cools the air supplied to the passenger compartment.

  The refrigeration cycle apparatus can further include an internal heat exchange for exchanging heat between the high-pressure side liquid refrigerant and the low-pressure side gas refrigerant, and a receiver or accumulator tank element that stores excess refrigerant. The power source can be provided by an internal combustion engine or an electric motor.

  The evaporator 40 is a cold storage heat exchanger and has a refrigerant passage member branched into a plurality. The refrigerant passage member is provided by a metal passage member such as aluminum. The refrigerant passage member is provided by headers 41 to 44 positioned in pairs and a plurality of refrigerant pipes 45 connecting the headers 41 to 44.

  As shown in FIGS. 1 and 2, the first header 41 and the second header 42 form a pair, and are arranged in parallel at a predetermined distance from each other. The third header 43 and the fourth header 44 also form a set and are arranged in parallel with a predetermined distance from each other. A plurality of refrigerant tubes 45 are arranged at equal intervals between the first header 41 and the second header 42. A plurality of refrigerant tubes 45 are arranged at equal intervals between the third header 43 and the fourth header 44. Each refrigerant pipe 45 communicates with the corresponding header at its end.

  As shown in FIG. 2, the first heat exchange section 48 is formed by the first header 41, the second header 42, and the plurality of refrigerant tubes 45 arranged therebetween. Similarly, the 2nd heat exchange part 49 is formed of the 3rd header 43, the 4th header 44, and the some refrigerant | coolant pipe | tube 45 arrange | positioned among them. As a result, the evaporator 40 has a first heat exchange unit 48 and a second heat exchange unit 49 arranged in two layers. With respect to the air flow direction, the second heat exchange unit 49 is arranged on the upstream side, and the first heat exchange unit 48 is arranged on the downstream side.

  A joint (not shown) as a refrigerant inlet is provided at the end of the first header 41. The inside of the first header 41 is partitioned into a first partition and a second partition by a partition plate (not shown) provided approximately at the center in the length direction. Correspondingly, the plurality of refrigerant tubes 45 are divided into a first group and a second group. The refrigerant is supplied to the first section of the first header 41. The refrigerant is distributed from the first section to a plurality of refrigerant tubes 45 belonging to the first group. The refrigerant flows into the second header 42 through the first group and is collected. The refrigerant is distributed again from the second header 42 to the plurality of refrigerant tubes 45 belonging to the second group. The refrigerant flows into the second section of the first header 41 through the second group. Thus, in the 1st heat exchange part 48, the flow path which flows a refrigerant | coolant in a U shape is formed.

  A joint (not shown) as a refrigerant outlet is provided at the end of the third header 43. The inside of the third header 43 is partitioned into a first partition and a second partition by a partition plate (not shown) provided substantially at the center in the length direction. Correspondingly, the plurality of refrigerant tubes 45 are divided into a first group and a second group. The first section of the third header 43 is adjacent to the second section of the first header 41. The first section of the third header 43 and the second section of the first header 41 are in communication.

  The refrigerant flows from the second section of the first header 41 into the first section of the third header 43. The refrigerant is distributed from the first section to a plurality of refrigerant tubes 45 belonging to the first group. The refrigerant flows into the fourth header 44 through the first group and is collected. The refrigerant is distributed again from the fourth header 44 to the plurality of refrigerant tubes 45 belonging to the second group. The refrigerant flows into the second section of the third header 43 through the second group. Thus, in the 2nd heat exchange part 49, the flow path which flows a refrigerant | coolant in a U shape is formed. The refrigerant in the second section of the third header 43 flows out from the refrigerant outlet and flows toward the compressor.

  Next, a specific configuration of the refrigerant pipe 45 and the like will be described. In FIG. 3, the thickness of the cold storage container 47 is omitted, and the cold storage material 50 is hatched. The refrigerant pipe 45 is a multi-hole pipe having a plurality of refrigerant passages 45a through which the refrigerant flows. The refrigerant tube 45 is also called a flat tube. This multi-hole tube can be obtained by an extrusion manufacturing method. The plurality of refrigerant passages 45 a extend along the longitudinal direction of the refrigerant pipe 45 and open at both ends of the refrigerant pipe 45. The plurality of refrigerant tubes 45 are arranged in a row. In each row, the plurality of refrigerant tubes 45 are arranged so that their main surfaces face each other. The plurality of refrigerant tubes 45 partition an air passage 460 for exchanging heat with air between two adjacent refrigerant tubes 45 and an accommodating portion 461 for accommodating a cold storage container 47 described later. .

  The evaporator 40 includes outer fins 46 for increasing the contact area with the air supplied to the passenger compartment. The outer fins 46 are provided by a plurality of corrugated outer fins 46. The outer fin 46 is disposed in an air passage 460 defined between two adjacent refrigerant tubes 45. The outer fin 46 is thermally coupled to two adjacent refrigerant tubes 45. The outer fin 46 is joined to the two adjacent refrigerant pipes 45 by a joining material excellent in heat transfer. A brazing material can be used as the bonding material. The outer fin 46 has a shape in which a metal plate such as thin aluminum is bent in a wave shape, and includes an air passage 460 called a louver.

  Next, the cold storage container 47 will be described. The cold storage container 47 is a cold storage body and divides a room for accommodating the cold storage material 50 therein. The cold storage container 47 has a flat cylindrical shape. The cold storage container 47 is closed by crushing the cylinder in the thickness direction at both ends in the longitudinal direction, and a space for accommodating the cold storage material 50 is formed inside. The cold storage container 47 has a wide main surface on both surfaces. The two main walls that provide these two main surfaces are each arranged in parallel with the refrigerant pipe 45. And it arrange | positions so that the refrigerant | coolant pipe | tube 45 may contact at least one surface, and this embodiment both surfaces.

  The cold storage container 47 is thermally coupled to two refrigerant tubes 45 disposed on both sides thereof. The cold storage container 47 is joined to the two adjacent refrigerant pipes 45 by a joining material excellent in heat transfer. As the bonding material, a resin material such as a brazing material or an adhesive can be used. The cold storage container 47 is brazed to the refrigerant pipe 45. A large amount of brazing material is disposed between the cold storage container 47 and the refrigerant pipe 45 in order to connect them with a wide cross-sectional area. This brazing material can be provided by placing a brazing foil between the cold storage container 47 and the refrigerant pipe 45. As a result, the cold storage container 47 exhibits good heat conduction with the refrigerant pipe 45.

  The thickness of each cold storage container 47 is substantially equal to the thickness of the air passage 460. Therefore, the thickness of the cold storage container 47 is substantially equal to the thickness of the outer fin 46. The outer fin 46 and the cold storage container 47 are interchangeable. As a result, the arrangement pattern of the plurality of outer fins 46 and the plurality of cold storage containers 47 can be set with a high degree of freedom.

  The length of the cold storage container 47 is substantially the same as that of the outer fin 46. As a result, the cold storage container 47 occupies substantially the entire longitudinal direction of the accommodating portion 461 defined between the two adjacent refrigerant tubes 45. The gap between the cold storage container 47 and the headers 41 to 44 is preferably filled with a section of the outer fin 46 or a filler such as resin.

  The plurality of refrigerant tubes 45 are arranged at substantially constant intervals. A plurality of gaps are formed between the plurality of refrigerant tubes 45. In the plurality of gaps, a plurality of outer fins 46 and a plurality of cold storage containers 47 are arranged with a predetermined regularity. A part of the gap is an air passage 460. The remaining part of the gap is the accommodating part 461 of the cold storage container 47. Of the total interval formed between the plurality of refrigerant tubes 45, for example, 10% or more and 50% or less is the accommodating portion 461. A cool storage container 47 is disposed in the housing portion 461.

  The cold storage containers 47 are arranged almost uniformly distributed throughout the evaporator 40. The two refrigerant tubes 45 located on both sides of the cold storage container 47 define an air passage 460 for exchanging heat with air on the side opposite to the cold storage container 47. From another point of view, two refrigerant tubes 45 are disposed between the two outer fins 46, and a pair of cold storage containers 47 including two cold storage vessels 47 are disposed between the two refrigerant tubes 45. ing.

  The cold storage container 47 is made of metal such as aluminum and aluminum alloy. Further, as the material other than aluminum for the cold storage container 47, for example, a material containing a metal whose ionization tendency is lower than that of hydrogen as a main material or a component is used.

  Next, the cold storage material 50 will be described. The cold storage material 50 is a material that exchanges heat with the refrigerant flowing through the refrigerant passage 45a to keep the amount of heat from the refrigerant. The cold storage material 50 is retained by solidifying the heat from the refrigerant, and is released to the outside by melting the retained heat.

  The regenerator material 50 of the present embodiment includes a material in which two or more types of ester compounds having different carbon numbers are mixed. As a comparative example, an ester compound having a molecular structure in which two types of alkyl groups sandwich an ester bond has a high latent heat of fusion and may be applied to a vehicle heat exchanger. However, most of them have melting points of 0 ° C. or lower or 15 ° C. or higher, and cannot be stored because they are outside the operating temperature range of the vehicle air conditioner. Furthermore, since the ester bond contains a double bond, there are two problems that it is more susceptible to oxidative degradation than paraffin.

  The vehicle air conditioner prevents the refrigerant from becoming below 0 ° C. in order to prevent performance degradation due to condensation of condensed water during operation and blocking the air flow in the evaporator 40. Therefore, an ester compound in which two alkyl groups having a melting point at 0 ° C. or lower both have 2 or more carbon atoms cannot be used, and one alkyl group needs to have 1 carbon atom (= methyl group).

Therefore, the ester compound of the present embodiment has 10 to 40 carbon atoms and is composed of one ester bond (double bond) sandwiched between an alkyl group and a methyl group. The ester compound is R1-CO-O-R2. Here, R1 is, for example, CH _{3 to} C ₁₈ C ₃₇ . R2 is, for example, C ₈ H _{17 to} C ₂₂ H ₄₅ .

  In order to maintain a cooling feeling, it is preferable to select one having a low melting point. For example, as shown in Table 1, R1 is C1 and R2 is C12 ester compound A (first ester compound), and R1 is C1 and R2 is C14 ester compound B (second It is preferable to use a mixture of ester compounds) as the cold storage material 50. The ester compound A has 14 carbon atoms. The ester compound B has 16 carbon atoms.

In other words, the cold storage material 50 is based on two ester compounds having a structure in which an ester bond is sandwiched between two alkyl groups (a functional group composed of carbon and hydrogen). In the ester compound A, two alkyl groups having a single melting point of 5 ° C. are a methyl group having 1 carbon atom and an alkyl group having 12 carbon atoms. In the ester compound B, two alkyl groups having a melting point of 18 ° C. are a methyl group having 1 carbon atom and an alkyl group having 14 carbon atoms.

  Furthermore, as a compounding ratio, the mass percentage concentration of the ester compound A in the regenerator 50 is 5 mass percent concentration or more and 20 mass percent concentration or less, and the ester compound B is 80 mass percent concentration or more and 95 mass percent concentration or less. Further preferred. Numbers 2 to 4 in Table 1 correspond to preferable combinations. By setting it as this compounding ratio, melting | fusing point can be made into temperature required for maintenance of cooling, ensuring high latent heat. Further, as shown in number 6 in Table 1, the number 2 to number 4 regenerator material 50 has the same amount of latent heat (= per volume) as that of paraffin. Therefore, the enlargement of the cold storage container 47 can be suppressed.

  Further, when the evaporator 40 uses aluminum as a material, the container is punctured due to corrosion of aluminum by contact with moisture, and the inside of the container is pressurized with hydrogen gas, which is a product of the corrosion reaction, so that the container expands. There is a risk of deformation. Therefore, it is preferable to add a hydrogen generation inhibitor to the cold storage material 50. The hydrogen generation inhibitor is preferably selected from at least one selected from the group consisting of, for example, amine salts, carboxylic acid esters, benzotriazoles, sulfonates, phosphate esters, and mixtures thereof.

  Further, the ester compound forms a double bond with carbon and oxygen atoms in the ester bond, and is easily oxidized and deteriorated. Therefore, it is preferable to add an antioxidant to the cold storage material 50. For example, a phenol-based antioxidant is used as the antioxidant.

  Next, the operation of this embodiment will be described. When there is an air conditioning request from the passenger, for example, a cooling request, the compressor is driven by a power source. The compressor sucks the refrigerant from the evaporator 40, compresses it, and discharges it. The refrigerant discharged from the compressor is radiated by the radiator. The refrigerant discharged from the radiator is decompressed by the decompressor and supplied to the evaporator 40. The refrigerant evaporates in the evaporator 40, cools the cold storage container 47, and cools surrounding air through the outer fins 46. When the vehicle is temporarily stopped, the power source is stopped to reduce energy consumption, and the compressor is stopped. Thereafter, the refrigerant in the evaporator 40 gradually loses its cooling capacity. In this process, the cool storage material 50 gradually cools and cools the air. At this time, the heat of the air is conducted to the cold storage material 50 through the outer fin 46, the refrigerant pipe 45, and the cold storage container 47. As a result, even if the refrigeration cycle apparatus is temporarily stopped, the cool storage material 50 can cool the air. Eventually, when the vehicle starts running again, the power source drives the compressor again. For this reason, the refrigeration cycle apparatus cools the cold storage material 50 again, and the cold storage material 50 stores cold.

  As described above, the regenerator material 50 of this embodiment includes a material in which two or more types of ester compounds having different carbon numbers are mixed. The ester compound has 10 to 40 carbon atoms and is composed of one ester bond sandwiched between an alkyl group and a methyl group. In the case of one ester bond sandwiched between two alkyl groups, the melting point becomes 0 ° C. or lower, but the melting point can be made higher than 0 ° C. by using a methyl group as described above. Therefore, the temperature range in which the cold storage material 50 is solidified and melted can be widened in an appropriate range. Thereby, even if the temperature of air is low, the cool storage material 50 can be melted and allowed to cool. Therefore, even when the temperature of the air is low, it is possible to maintain the temperature below the wet bulb temperature of the passing air, and the generation of odor accompanying the evaporation of the condensed water can be suppressed. Moreover, since the temperature range in which the cool storage material 50 can store and cool is wide, the cool storage function can be maintained in a wider range of air temperatures.

  In other words, the cold storage material 50 of this embodiment can store cold in a wide temperature range. As a result, the idle stop time can be ensured not only in summer but also in winter (10 ° C. or lower environment) as in the prior art.

  In this embodiment, since the ester compound has 14 to 18 carbon atoms, the latent heat can be equivalent to that of paraffin as shown in Table 1. Thus, it is possible to realize the cold storage material 50 that can store latent heat in a temperature range with a wide melting point.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. This embodiment is characterized by the arrangement of the cold storage container 47B. A plurality of cool storage containers 47B are disposed between two adjacent refrigerant tubes 45, two in the present embodiment. Each cool storage container 47B is arranged along the flow direction of the intake air. Moreover, in the same accommodating part 461, each cool storage container 47B accommodates the different cool storage materials 50a and 50b, respectively.

  For each of the cold storage materials 50a and 50b, for example, two different numbers 2 to 4 in Table 1 are selected. As a result, cold storage can be performed in a wider temperature range than when one type of cold storage material 50 is used.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. This embodiment is characterized by the arrangement of the cold storage container 47C. A plurality of cool storage containers 47C are disposed between two adjacent refrigerant tubes 45, two in the present embodiment. Each cool storage container 47C is arranged along a direction orthogonal to the flow direction of the intake air. In other words, each of the cold storage containers 47C is stacked in the direction in which the refrigerant tubes 45 are arranged at intervals. Moreover, in the same accommodating part 461, each cool storage container 47C accommodates the different cool storage materials 50a and 50b.

  For each of the cold storage materials 50a and 50b, for example, two different numbers 2 to 4 in Table 1 are selected. As a result, cold storage can be performed in a wider temperature range than when one type of cold storage material 50 is used.

(Other embodiments)
The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  The structure of the said embodiment is an illustration to the last, Comprising: The scope of the present invention is not limited to the range of these description. The scope of the present invention is indicated by the description of the scope of claims, and further includes meanings equivalent to the description of the scope of claims and all modifications within the scope.

  In the first embodiment described above, the cold storage materials 50 sealed in the respective cold storage containers 47 are equal to each other, but are not limited to the same configuration. For example, in the cool storage containers 47 adjacent to each other, different cool storage materials 50 may be enclosed as in the second and third embodiments described above. Also by this, the same operation and effect as those of the second and third embodiments can be achieved.

  In the first embodiment described above, the cool storage body is realized by the cool storage container 47, but is not limited to the cool storage container 47 containing only the cool storage material 50 therein. Therefore, the cool storage body may be a member that divides a room in which a cool storage material is housed by combining a plurality of members, for example. In other words, for example, the cold storage body is formed by deforming one plate into an S shape, and the opening is made up of other members, one space is accommodated in the cold storage material, and the refrigerant is accommodated in the other space. Good.

  The refrigerant pipe 45 can be provided by a multi-hole extruded pipe or a pipe formed by bending a plate material on which dimples are formed. Further, the outer fin 46 can be omitted. Such a heat exchanger is also called a finless type. Instead of the outer fins 46, protrusions or the like extending from the refrigerant pipe may be provided to promote heat exchange with air.

  The present invention can be applied to an evaporator having various flow paths. For example, instead of the left and right U-turn type as in the first embodiment, the present invention may be applied to an evaporator such as a one-way type or a front and rear U-turn type.

  Furthermore, the present invention may be applied to refrigeration cycle apparatuses such as refrigeration, heating, and hot water supply. Furthermore, the present invention may be applied to a refrigeration cycle apparatus including an ejector.

DESCRIPTION OF SYMBOLS 40 ... Evaporator (cold storage heat exchanger) 41 ... 1st header 42 ... 2nd header 43 ... 3rd header 44 ... 4th header 45 ... Refrigerant pipe 45a ... Refrigerant passage 46 ... Outer fin 47 ... Cold storage container (cold storage body) 48 ... 1st heat exchange part 49 ... 2nd heat exchange part 50, 50a, 50b ... Cold storage material 70 ... Inner fin 460 ... Air passage 461 ... Accommodating part

Claims (3)

A regenerative heat exchanger (40) for exchanging heat with air flowing around it,
A refrigerant passage (45a) through which the refrigerant flows;
A regenerator (47) that houses therein a regenerator material (50, 50a, 50b) that exchanges heat with the refrigerant flowing through the refrigerant passage and retains the amount of heat from the refrigerant,
The regenerator material includes a material in which two or more ester compounds having different carbon numbers are mixed,
The said ester compound is C10 or more and 40 or less, and is comprised from one ester bond pinched | interposed by the alkyl group and the methyl group, The cool storage heat exchanger characterized by the above-mentioned.   The regenerative heat exchanger according to claim 1, wherein the ester compound has 14 to 18 carbon atoms. The cold storage material includes a material in which a first ester compound having 14 carbon atoms and a second ester compound having 16 carbon atoms are mixed,
The first ester compound has a mass percent concentration in the cold storage material of 5 mass percent concentration or more and 20 mass percent concentration or less,
The cold storage heat exchanger according to claim 2, wherein the second ester compound has a mass percent concentration in the cold storage material of not less than 80 mass percent and not more than 95 mass percent.

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