EP4660546A1

EP4660546A1 - Refrigeration apparatus

Info

Publication number: EP4660546A1
Application number: EP25173883.7A
Authority: EP
Inventors: Hai TIAN; Linhui Chen; Fei Xie
Original assignee: Carrier Corp
Current assignee: Carrier Corp
Priority date: 2024-06-03
Filing date: 2025-05-01
Publication date: 2025-12-10
Also published as: US20250369678A1; CN121067396A

Abstract

This application provides a refrigeration apparatus using a main fan (3) to cool an electronic control device (5) while meeting heat exchange requirements of a heat exchanger (1). By arranging a first air duct (2) and a second air duct (4) in parallel, and controlling a relationship between a cross-sectional area of a first air duct inlet (21) and a cross-sectional area of a second air duct outlet (42), and a relationship between a cross-sectional area of a second air duct inlet (41) and the cross-sectional area of the second air duct outlet (42), air flowing into the first air duct (2) after heat exchange with a refrigerant in the heat exchanger (1) and air in the second air duct (4) after heat exchange with the electronic control device (5) are merged in the first air duct (2), and are discharged from the refrigeration apparatus through a first air duct outlet (22).

Description

PRIORITY CLAIM

This application claims benefit of Chinese Patent Application No. 202410710920.6, filed June 3, 2024 , the contents of which in their entirety are herein incorporated by reference.

BACKGROUND

This application relates to the field of refrigeration/cooling apparatus, and specifically to a refrigeration apparatus that utilizes a main fan to cool an electronic control device.
When a refrigeration apparatus works, an electronic control device controls components in the refrigeration apparatus to operate. However, in the process of delivering high-power electric energy, electrical components generate a large amount of heat. If the electronic control device is not cooled in time, the efficiency and reliability of the electronic control device will be reduced, and even the electronic components inside the electronic control device will be damaged. The term "refrigeration apparatus" as used in this application includes "apparatus that provides cooling, such as HVAC equipment".
A traditional solution is to use a self-controlled fan to dissipate heat for an electronic control device, but the fan is susceptible to dust and dirt and is sensitive to dust. Another traditional solution is to add liquid coolant to cool the electronic control device, but this solution requires higher cost and more space to install a cooling system.

SUMMARY

This application aims to provide a refrigeration apparatus to at least solve or alleviate some of the problems existing in the prior art.
According to a first aspect of the invention there is provided a refrigeration apparatus for cooling an electronic control device by using a main fan, the refrigeration apparatus including: a heat exchanger; a first air duct with an air inlet disposed corresponding to the heat exchanger; a fan disposed at an air outlet of the first air duct, corresponding to the heat exchanger across the first air duct; a second air duct with an air outlet opened on a side of the first air duct and an air inlet open to an atmosphere; and an electronic control device disposed in the second air duct.
In one or more embodiments, the first air duct and the second air duct are perpendicular to each other.
In one or more embodiments, the air outlet of the second air duct is opened on the side of the first air duct while being immediately adjacent to the heat exchanger.
In one or more embodiments, the electronic control device includes an electronic control unit and heat dissipation fins disposed around the electronic control unit.
In one or more embodiments, the heat dissipation fins include air duct-parallel heat dissipation fins disposed parallel to an airflow direction in the second air duct, and air duct flow-guiding heat dissipation fins disposed at a predetermined angle relative to the airflow direction in the second air duct.
In one or more embodiments, the air duct flow-guiding heat dissipation fins are disposed on a side of the electronic control unit closer to the air inlet of the second air duct.
In one or more embodiments, a cross-sectional area X of the air inlet of the first air duct and a cross-sectional area Y of the air outlet of the second air duct satisfy a mathematical relationship of Y < 0.05X.
In one or more embodiments, a cross-sectional area C of the air inlet of the second air duct and a cross-sectional area D of the air outlet of the second air duct satisfy a mathematical relationship of C > D.
In one or more embodiments, the refrigeration apparatus further includes: a filter screen disposed at the air inlet of the second air duct.
In one or more embodiments, the refrigeration apparatus further includes: a flow guide plate disposed at the air outlet of the second air duct while being close to a side of the heat exchanger and configured to guide air from the second air duct and air from the first air duct.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

Certain exemplary embodiments will now be described in greater detail by way of example only and with reference to the accompanying drawings in which:

Fig. 1 is a diagram of a structure and an airflow pattern of a refrigeration apparatus;
Fig. 2 is a schematic diagram of a partial structure of the refrigeration apparatus;
Fig. 3 is a cross-sectional view taken along a line A-A of the refrigeration apparatus in Fig. 2;
Fig. 4 is a diagram of a structure and an airflow pattern of the refrigeration apparatus;
Fig. 5 is a schematic diagram of a partial structure of the refrigeration apparatus;
Fig. 6 is a cross-sectional view taken along a line B-B of the refrigeration apparatus in Fig. 2;
Fig. 7 is a schematic diagram of a partial structure of the refrigeration apparatus in Fig. 2; and
Fig. 8 is a diagram of a structure and an airflow pattern of a refrigeration apparatus.

List of Reference Numerals: Heat exchanger 1, first air duct 2, first air duct inlet 21, first air duct outlet 22, fan 3, second air duct 4, second air duct inlet 41, second air duct outlet 42, second air duct extension 43, electronic control device 5, electronic control unit 51, air duct-parallel heat dissipation fin 52, filter screen 6, and flow guide plate 7.

DETAILED DESCRIPTION OF THE DISCLOSURE

It should be noted that working principles, features, advantages, and the like of a refrigeration apparatus according to this application will be explained below by way of embodiments. However, it should be understood that all descriptions are only given for exemplification and therefore these embodiments should not be understood as forming any limitation on the present application.
In addition, for any single technical feature described or implicit in the embodiments mentioned herein, or any single technical feature illustrated or implicit in the drawings, this application still allows any combination or deletion between these technical features (or equivalents thereof) without any technical obstacles, thereby obtaining more other embodiments of this application that may not be directly mentioned herein.
Fig. 1 is a diagram of a partial structure and an airflow pattern of a refrigeration apparatus according to one or more embodiments of this application, and Fig. 2 is a schematic diagram of a partial structure of the refrigeration apparatus according to one or more embodiments of this application. Referring to Fig. 1 and Fig. 2, the refrigeration apparatus according to one or more embodiments includes: a heat exchanger 1, a first air duct 2, a first air duct inlet 21, a first air duct outlet 22, a fan 3, a second air duct 4, a second air duct inlet 41, a second air duct outlet 42, and an electronic control device 5.
As illustrated in Fig. 1, the heat exchanger 1 is disposed corresponding to the first air duct inlet 21, and the fan 3 is disposed at the first air duct outlet 22, corresponding to the heat exchanger 1 across the first air duct 2, thereby forming an air path by sequentially connecting the heat exchanger 1, the first air duct inlet 21, the first air duct 2, the first air duct outlet 22, and the fan 3. That is, when the fan 3 operates, air in the atmosphere flows through the air path formed by the heat exchanger 1, the first air duct inlet 21, the first air duct 2, the first air duct outlet 22, and the fan 3 in sequence, and then is discharged from the refrigeration apparatus.
Fig. 2 is a schematic diagram of a partial structure viewed from a side where the heat exchanger 1 of the refrigeration apparatus is located in some embodiments, but due to obstructions such as equipment in a viewing direction, the first air duct outlet 22, the fan 3, the second air duct 4, the second air duct inlet 41, the second air duct outlet 42 and connectivity relationships thereof involved in some embodiments cannot be completely illustrated in Fig. 2. Therefore, one or more embodiments of this application are further described through cross-sectional views taken along lines A-A and B-B of the refrigeration apparatus in Fig. 2. Fig. 3 is a cross-sectional view taken along the line A-A of the refrigeration apparatus in Fig. 2 according to one or more embodiments of this application, and Fig. 6 is a cross-sectional view taken along the line B-B of the refrigeration apparatus in Fig. 2 according to one or more embodiments of this application. Fig. 7 is a schematic diagram of a partial structure of the refrigeration apparatus in Fig. 2 according to one or more embodiments of this application.
Referring to Fig. 3, Fig. 6, and Fig. 7, the second air duct 4 is disposed on the side of the first air duct 2 while being substantially perpendicular to the first air duct 2. The second air duct 4 has the second air duct inlet 41 and the second air duct outlet 42, and the electronic control device 5 is further provided in the second air duct 4. Specifically, the second air duct outlet 42 is preferably opened on a side of the first air duct 2 while being immediately adjacent to the heat exchanger 1. When the fan 3 operates, a negative pressure is formed in the first air duct 2, and air in the atmosphere enters the second air duct 4 from the second air duct inlet 41, flows out of the second air duct outlet 42, and then merges, in the first air duct 2, with the air in the first air duct 2. The merged air flows through the fan 3 and then is discharged from the refrigeration apparatus.
In some embodiments, since the heat exchanger 1 and the fan 3 are disposed correspondingly while being relatively close to each other, the first air duct 2 is relatively short in an airflow direction. However, this application is not limited thereto. When the heat exchanger 1 and the fan 3 are far away from each other, the heat exchanger 1 and the fan 3 may also be connected by increasing a length of the first air duct 2 in the airflow direction. Any configuration in which air that exchanges heat with a refrigerant in the heat exchanger 1, can merge with air that exchanges heat with heat dissipation fins of the electronic control device 5 after passing through the electronic control device 5 and the merged air can be controlled to be discharged from the refrigeration apparatus through the fan 3 and the first air duct outlet 22, shall fall within the protection scope of this application as defined by the appended claims.
In addition, the first air duct 2 illustrated in Fig. 3 in some embodiments is shorter in the airflow direction and wider in a direction substantially perpendicular to the airflow direction, which still conforms to the feature that "the second air duct 4 is disposed substantially perpendicular to the first air duct 2" in this application. The expression "the second air duct 4 is disposed substantially perpendicular to the first air duct 2" in this application means that a direction of air flowing in the second air duct 4 is substantially perpendicular to a direction of air flowing in the first air duct 2, which is particularly clarified herein.
In addition, as illustrated in Fig. 3, in some embodiments, a plane on which the fan 3 is located and a plane on which the heat exchanger 1 is located are not parallel to each other. Regardless of whether the fan 3 and the heat exchanger 1 are disposed in parallel, any configuration where the fan 3 provides the heat exchanger 1 with airflow required for cooling shall belong to the situation where "the fan 3 is disposed corresponding to the heat exchanger 1 across the first air duct 2" as defined in this application.
In addition, in some embodiments, since the heat exchanger 1, the fan 3 and the electronic control device 5 are all correspondingly disposed while being relatively close to each other, the second air duct 4 is disposed corresponding to the electronic control device 5. However, this application is not limited thereto. When the heat exchanger 1, the fan 3, and the electronic control device 5 are far away from each other, the second air duct 4 may also be connected to the first air duct 2 by extending a pipeline of the second air duct 4. Any configuration in which air that exchanges heat with a refrigerant in the heat exchanger 1 can merge with air that exchanges heat with heat dissipation fins of the electronic control device 5 after passing through the electronic control device 5 and the merged air can be controlled to be discharged from the refrigeration apparatus through the fan 3 and the first air duct outlet 22, shall fall within the protection scope of this application as defined by the appended claims.
In addition, a partial structure of the electronic control device 5 is used to form a part of the second air duct 4, which also falls within the protection scope of this application as defined by the appended claims.
Specifically, as a preferred embodiment, Fig. 4 is a diagram of a structure and an airflow pattern of the refrigeration apparatus according to one or more embodiments of this application. Referring to Fig. 4, when the heat exchanger 1 and the electronic control device 5 are disposed at a relatively far distance from each other, a second air duct extension 43 may be further disposed between the heat exchanger 1 and the electronic control device 5, and the second air duct extension 43 allows the second air duct 4 to communicate with the second air duct outlet 42. The second air duct outlet 42 is opened on the side of the first air duct 2 while being immediately adjacent to the heat exchanger 1. An air path is constructed by sequentially connecting the second air duct inlet 41, the second air duct 4, the second air duct extension 43, the second air duct outlet 42, and the first air duct 2. That is, when the fan 3 operates, a negative pressure is formed in the first air duct 2 and the second air duct extension 43, air in the atmosphere enters the second air duct 4 from the second air duct inlet 41 and exchanges heat with the electronic control device 5. The air after heat exchange flows through the second air duct extension 43, enters the first air duct 2 through the second air duct outlet 42, and then merges, in the first air duct 2, with the air in the first air duct 2. The merged air flows through the fan 3 and then is discharged from the refrigeration apparatus.
According to the refrigeration apparatus in one or more embodiments of this application, when the fan 3 operates, due to a pressure difference caused by the operation of the fan 3, air in the atmosphere flows through the heat exchanger 1, exchanges heat with the refrigerant in the heat exchanger 1, takes away heat released by the refrigerant during a condensation process, and then flows into the first air duct 2. At this time, the second air duct outlet 42 is opened on the side of the first air duct 2 and the second air duct inlet 41 is open to the atmosphere, and therefore, dues to the pressure difference caused by the operation of the fan 3, air in the atmosphere also enters from the second air duct inlet 41, flows through the second air duct 4, exchanges heat with the electronic control device 5 disposed in the second air duct 4, takes away heat generated by electrical components of the electronic control device 5 during operation, merges to the first air duct 2 through the second air duct outlet 42, and then is discharged from the refrigeration apparatus. Alternatively, when the second air duct extension 43 is provided, the air flows into the second air duct extension 43 after passing through the second air duct, and then merges to the first air duct 2 through the second air duct outlet 42.
Meanwhile, the second air duct outlet 42 is opened on the side of the first air duct 2. Although the air flowing through the electronic control device 5 exchanges heat with the electronic control device 5 and then enters the first air duct 2, a heat exchange efficiency of the heat exchanger 1 is not affected because the second air duct outlet 42 is located downstream of an air path of the heat exchanger 1.
Fig. 5 is a schematic diagram of a partial structure of the refrigeration apparatus according to one or more embodiments of this application. Referring to Fig. 5, the electronic control device 5 of the refrigeration apparatus in some embodiments further includes an electronic control unit 51, air duct-parallel heat dissipation fins 52, and air duct flow-guiding heat dissipation fins (not illustrated). The air duct-parallel heat dissipation fins 52 are disposed on both sides of the electronic control unit 51 while being substantially parallel to an airflow direction in the second air duct 4, thereby maximizing a heat exchange area between the fins and flowing air and reducing pressure drop caused by friction with surfaces of the heat dissipation fins during air circulation.
Although not illustrated in Fig. 5, preferably, the air duct flow-guiding heat dissipation fins may be provided between the electronic control unit 51 and the second air duct inlet 41 at a predetermined angle relative to the airflow direction in the second air duct 4, so as to adjust and control the air entering from the second air duct inlet 41 to flow to both sides of the electronic control unit 51 at a predetermined angle and perform heat exchange with the air duct-parallel heat dissipation fins 52 disposed on both sides of the electronic control unit 51, thereby reducing airflow resistance caused by the electronic control unit 51 blocking the air entering from the second air duct inlet 41. Therefore, even if a self-controlled fan directly assigned to the electronic control unit is not driven, the flow of the air in the second air duct 4 can be ensured to better exchange heat with the air duct-parallel heat dissipation fins 52, thereby improving a heat dissipation efficiency of the electronic control unit 51.
With the arrangement of the first air duct 2 and the second air duct 4 provided in some embodiments, through the operation of one fan 3, a cooling air path can be established separately for the heat exchanger 1 and the electronic control device 5 to simultaneously cool the heat exchanger 1 and the electronic control device 5 without requiring a dedicated self-controlled cooling fan for the electronic control unit 51, thereby saving the cost and avoiding the possibility that the electronic control device 5 is overheated due to a failure of the self-controlled cooling fan and an operation of the refrigeration apparatus becomes abnormal.
Meanwhile, through the parallel arrangement of respective air paths of the first air duct 2 and the second air duct 4, the air flowing through the heat exchanger 1 flows into the first air duct 2 after completing heat exchange with the heat exchanger 1, merges with the air flowing through the electronic control device 5 through the second air duct 4 and completing heat exchange with the electronic control device 5, and is discharged to the outside of the refrigeration apparatus. This avoids the problem in the prior art that in some refrigeration equipment units, the heat exchanger 1 and the electronic control device 5 are disposed in series, and thus the air first exchanges heat with the heat exchanger 1 (or the electronic control device 5), causing the air temperature to rise, and then exchanges heat with the electronic control device 5 (or the heat exchanger 1), thereby reducing a heat exchange effect.
In some embodiments, the air duct-parallel heat dissipation fins 52 and the air duct flow-guiding heat dissipation fins are disposed around the electronic control unit 51, but this application is not limited thereto. Any heat dissipation fins that facilitate heat transfer from the electronic component of the electronic control unit 51 to the air flowing in the second air duct 4 and can improve the heat dissipation efficiency of the electronic control unit 51 shall fall within the protection scope of this application as defined by the appended claims. In addition, in some embodiments, the air duct-parallel heat dissipation fins 52 and the air duct flow-guiding heat dissipation fins are disposed densely. However, this application is not limited thereto. The arrangement number of the heat dissipation fins can also be considered according to a model of the electronic control unit 51, a model of the fan 3, an operating condition of the electronic control unit 51, an operating condition of the fan 3, a size of the heat dissipation fin, and the like.
In addition, in some embodiments, the air duct flow-guiding heat dissipation fins are disposed between the electronic control unit 51 and the second air duct inlet 41, but this application is not limited thereto. The air duct flow-guiding heat dissipation fins may be disposed at other positions, for example, between the electronic control unit 51 and the second air duct outlet 42. Any configuration that can reduce airflow resistance in the second air duct 4 and improve the heat exchange efficiency of the heat dissipation fins shall fall within the protection scope of this application as defined by the appended claims.
The second embodiment of the present application is described using the same reference numerals as the first embodiment. A refrigeration apparatus provided in the second embodiment is different from the refrigeration apparatus of the first embodiment in that a cross-sectional area X of the first air duct inlet 21 and a cross-sectional area Y of the second air duct outlet 42 satisfy a mathematical relationship of Y < 0.05X.
In this way, according to heat exchange requirements of the heat exchanger 1 and the electronic control device 5, the mathematical relationship between the cross-sectional area of the second air duct outlet 42 and the cross-sectional area of the first air duct inlet 21 may be set to adjust and distribute an amount of air that flows through the heat exchanger 1 and enters the first air duct 2 through the first air duct inlet 21 and an amount of air that flows through the second air duct 4 and enters the first air duct 2 from the second air duct outlet 42, thereby matching and satisfy the heat exchange requirements of the heat exchanger 1 and the electronic control device 5.
In addition, preferably, a cross-sectional area C of the second air duct inlet 41 and a cross-sectional area D of the second air duct outlet 42 satisfy a mathematical relationship of C > D.
The cross-sectional area of the second air duct inlet 41 is greater than the cross-sectional area of the second air duct outlet 42, which is more conducive to airflow intake in the second air duct 4, and can also ensure the amount of air flowing in the second air duct 4 when a self-controlled fan directly assigned to the electronic control device 5 is not driven. Meanwhile, a throttling effect of the second air duct outlet 42 is conducive to making an air pressure before an outlet of the second air duct 4 to be greater than an air pressure after the outlet of the second air duct 4, thereby facilitating the air in the second air duct 4 to flow into the first air duct 2.
It should be noted that the specific values of X, Y, C and D may be set according to the model of the heat exchanger 1, the model of the electronic control unit 51, the model of the fan 3, the operating conditions of the heat exchanger 1, the electronic control unit 51 and the fan 3, and the like, and are not particularly limited.
According to the refrigeration apparatus provided in one or more embodiments, a driving force generated when the fan 3 operates enables external air to exchange heat with the refrigerant in the heat exchange process of the heat exchanger 1, take away the heat released by the refrigerant in the condensation process, and then enter the first air duct 2 from the first air duct inlet 21. Meanwhile, by setting the cross-sectional area X of the first air duct inlet 21 and the cross-sectional area Y of the second air duct outlet 42 to satisfy the mathematical relationship, the amount of air that flows through the heat exchanger 1 and enters the first air duct 2 through the first air duct inlet 21 and the amount of air that flows through the second air duct 4 and enters the first air duct 2 through the second air duct outlet 42 are adjusted and distributed, so that the heat exchange requirement of the heat exchanger 1 can be fully satisfied, and the amount of air flowing through the second air duct 4 can be ensured to be sufficient to meet a heat dissipation requirement of the electronic control device 5 disposed in the second air duct 4 and take away the heat generated by the electrical components in the electronic control unit 51 during operation.
The third embodiment of the present application is described using the same reference numerals as the first embodiment. As illustrated in Fig. 8, a refrigeration apparatus provided in the third embodiment is different from the first embodiment in that the refrigeration apparatus further includes a filter screen 6 and a flow guide plate 7.
Fig. 8 is a diagram of a structure and an airflow pattern of the refrigeration apparatus according to the third embodiment of this application. The filter screen 6 is disposed at the second air duct inlet 41, and the flow guide plate 7 is disposed at the second air duct outlet 42 while deflecting toward the fan 3, providing guidance for air from the second air duct 4 and air from the first air duct 2, and further guiding the air from the second air duct 4 and the air from the first air duct 2 to be discharged from the refrigeration apparatus. That is, the flow guide plate 7 guides the air from the second air duct 4 to the fan 3, and the flow guide plate 7 guides the air from the first air duct 2 to the fan 3.
In this way, the filter screen 6 is disposed at the second air duct inlet 41 to reduce a possibility that foreign matters enter with the air from the second air duct inlet 41 and adhere to the air duct-parallel heat dissipation fins 52 or the air duct flow-guiding heat dissipation fins, resulting in a decrease in the heat dissipation efficiency of the electronic control device 5. Meanwhile, a possibility is reduced that foreign matters enter the first air duct 2 through the second air duct outlet 42 and adhere to blades of the fan 3, resulting in an increase in energy consumption of the fan 3.
A mesh density of the filter screen 6 in some embodiments is not particularly limited. As long as grilles, baffles, and the like can block larger foreign objects, the same technical effects can be achieved, and the grilles, the baffles, and the like are all within the protection scope of this application as defined by the appended claims.
The flow guide plate 7 is disposed at the second air duct outlet 42 while being close to a side of the heat exchanger 1, and the flow guide plate 7 is used to block air in a localized portion of the first air duct 2, that is, near the second air duct outlet 42 and change a flowing direction of the air, thereby reducing a pressure in the localized portion of the first air duct 2, that is, near the second air duct outlet 42, and further guiding the air from the second air duct 4 to enter the first air duct 2.
A specific structure in an angle and a length of the flow guide plate 7 may be appropriately set as required, and any structure capable of appropriately reducing an air pressure near the second air duct outlet 42 to facilitate the guidance of the air from the second air duct 4 into the first air duct 2 shall fall within the scope of this application as defined by the appended claims.
The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the principles of this application shall be included in the protection scope of this application as defined by the appended claims.

Claims

A refrigeration apparatus comprising:
a heat exchanger (1);

a first air duct (2) with an air inlet (21) disposed corresponding to the heat exchanger;

a fan (3) disposed at an air outlet (22) of the first air duct, corresponding to the heat exchanger across the first air duct;

a second air duct (4) with an air outlet (42) opened on a side of the first air duct and an air inlet open (41) to an atmosphere; and

an electronic control device (5) disposed in the second air duct.
The refrigeration apparatus according to claim 1, wherein
the first air duct (2) and the second air duct (4) are perpendicular to each other.
The refrigeration apparatus according to claim 1 or 2, wherein
the air outlet (42) of the second air duct (4) is opened on the side of the first air duct (2) while being immediately adjacent to the heat exchanger (1).
The refrigeration apparatus according to claim 1, 2 or 3, wherein the electronic control device (5) further includes
an electronic control unit (51) and heat dissipation fins disposed around the electronic control unit.
The refrigeration apparatus according to claim 4, wherein the heat dissipation fins include
air duct-parallel heat dissipation fins (52) disposed parallel to an airflow direction in the second air duct (4), and

air duct flow-guiding heat dissipation fins disposed at a predetermined angle relative to the airflow direction in the second air duct.
The refrigeration apparatus according to claim 5, wherein the air duct flow-guiding heat dissipation fins are disposed on a side of the electronic control unit (51) closer to the air inlet (41) of the second air duct (4).
The refrigeration apparatus according to any preceding claim, wherein a cross-sectional area X of the air inlet (21) of the first air duct (2) and a cross-sectional area Y of the air outlet (42) of the second air duct (4) satisfy a mathematical relationship of Y < 0.05X.
The refrigeration apparatus according to any preceding claim, wherein a cross-sectional area C of the air inlet (41) of the second air duct (4) and a cross-sectional area D of the air outlet (42) of the second air duct satisfy a mathematical relationship of C > D.
The refrigeration apparatus according to any preceding claim, further comprising:
a filter screen (6) disposed at the air inlet (41) of the second air duct (4).
The refrigeration apparatus according to any preceding claim, further comprising:
a flow guide plate (7) disposed at the air outlet (42) of the second air duct (4) while deflecting toward the fan (3) and configured to guide air from the second air duct and air from the first air duct (2).