JP2014114968A - Heat exchange element and heating element housing device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve cooling performance of a cooling unit mounted with a heat exchange element.SOLUTION: A heat exchange element 14 exchanges heat by making a primary air current and a secondary air current flow through every other stage of air ducts formed between a plurality of heat transfer plates laminated at predetermined intervals. The heat exchange element 14 includes counter-current portions in which the primary air current and the secondary air current oppose to each other across the heat transfer plates. The heat exchange element 14 further includes: blocking portions 18a, 18b for preventing leakage of the air currents from portions excluding first inlets 16a, second inlets 17a, first outlets 16b and second outlets 17b of the air ducts; and flow passage division portions 19a, 19b for dividing inside of the air ducts into a plurality of flow passages. Flow passage lengths of the plurality of flow passages divided by the flow passage division portions 19a, 19b are different from each other. In the heat exchange element 14, in either one or both of the air ducts through which the primary air current flows and through which the secondary air current flows, the outlet is made larger than the inlet.

Description

  The present invention relates to a heat exchange element and a heating element storage device using the same.

  Conventionally, this type of heat exchange element is known to apply corrugating (see, for example, Patent Document 1).

  The heat exchange element will be described below with reference to FIGS. 12 (a) and 12 (b).

  As shown in FIG. 12A, the heat exchanger 101 has a pair of plates 102 opposed to each other with a certain gap, and a corrugated cross section for forming a plurality of parallel flow paths 103 in the gaps between the plates 102. A plate-like fin 104 having a shape, and a spacer 105 that guides the primary airflow M and the secondary airflow N introduced every other stage of the plate 102, and downstream of the parallel flow path 103 formed by the fins 104. Has a space 106. The plate 102 and the fin 104, and the plate 102 and the spacer 105 are joined by an adhesive. In addition, the inlets of the primary airflow M and the secondary airflow N are arranged on opposite surfaces, and the outlets of the primary airflow M and the secondary airflow N are surfaces on which the inlets of the primary airflow M and the secondary airflow N are arranged. The surface opposite to the surface on which the outlets of the primary airflow M and the secondary airflow N are disposed is closed. As shown in FIG. 12B, the fins 104 are formed so that the pitch P is continuously reduced from one side to the surface side where the outlets are arranged, and the flow path cross-sectional area of the parallel flow path 103 is changed. Thus, the heat exchange efficiency is improved.

Japanese Patent No. 1640604

  In such a conventional heat exchanger 101, the space portion 106 is provided on the downstream side of the parallel flow path 103, and the space portion 106 does not have a member for controlling the airflow. A drift occurs. Further, since it is difficult to maintain the space between the upper and lower plates 102 in the space portion 106, the plate 102 is deformed due to a pressure difference when the primary air flow M and the secondary air flow N are blown. The deformation of the plate 102 causes further drift in the space 106 to reduce the heat exchange efficiency, and the pressure loss increases to reduce the air volume. In such a cooling unit using the conventional heat exchanger 101, there is a problem that the cooling performance is lowered due to a decrease in heat exchange efficiency and a reduction in the air volume due to an increase in pressure loss, thereby improving the heat exchange efficiency of the heat exchange element. At the same time, it is required to reduce pressure loss.

  In addition, in order to reduce the cross-sectional area of the parallel flow path 103 close to the surface on which the outlet is disposed, the number of joints between the plate 102 and the fins 104 is greater than the number necessary for maintaining the structure of the parallel flow path 103. In order to reduce the effective area of the heat transfer plate by the joint, and further, the adhesive used to join the plate 102 and the fin 104 protrudes from the joint to significantly reduce the effective area of the plate 102. There is a problem that the heat exchange efficiency is lowered and the pressure loss is increased, and it is required to improve the heat exchange efficiency of the heat exchange element and reduce the pressure loss.

  Even when the inside of the flow path is divided into a plurality of parallel flow paths 103 by disposing an independent member on the plate 102 instead of the fins 104, the flow path having the widest pitch P of the parallel flow paths 103 is parallel. Since the pitch P cannot be made larger than the maximum pitch P that can maintain the structure of the flow path 103 and the pitch P is continuously reduced, it is necessary for maintaining the structure of the parallel flow path 103. More than the number, the flow path becomes smaller and the pressure loss increases, and the effective area of the plate 102 is greatly reduced, so there is a problem that the heat exchange efficiency is lowered. There is a need to improve and reduce pressure loss.

  Further, since the fins 104 and the spacers 105 are inserted between the plates 102 and bonded with an adhesive, the thicknesses of the fins 104 and the spacers 105 need to be accurately aligned, but the pitch P is not uniform in actual manufacturing. It is difficult to align the thicknesses of the fins 104 and the spacers 105 with high accuracy, and the fins 104 having a large thickness are crushed when bonded, and the fins 104 having a small thickness cannot be joined well to the plate 102, thereby realizing the designed pitch P. In addition, because the accuracy in the thickness direction is low and the heat transfer plate is deflected and the stacking height of each step is different, drift occurs in the heat exchange element, increasing the pressure loss and reducing the heat exchange efficiency. There is a problem that it is required to improve the heat exchange efficiency of the heat exchange element and reduce the pressure loss. That.

  Therefore, the present invention solves such a conventional problem by eliminating the drift in the ventilation path while maintaining the strength, improving the heat exchange efficiency of the heat exchange element and reducing the pressure loss. The purpose is to improve the cooling performance of a cooling unit equipped with a heat exchange element.

  In order to achieve this object, the present invention is a heat exchanger for exchanging heat by circulating a primary air flow and a secondary air flow every other stage of a ventilation path formed between a plurality of heat transfer plates stacked at a predetermined interval. The heat exchange element has an opposing flow portion in which the primary airflow and the secondary airflow face each other across the heat transfer plate, and the heat exchange element is the primary airflow path. A shielding portion for preventing leakage of airflow from portions other than the airflow inlet and the outlet of the secondary airflow, and a flow path dividing portion for dividing the inside of the ventilation path into a plurality of flow paths, and In the heat exchange element in which the flow path lengths of the plurality of flow paths divided by the flow path dividing unit are different from each other, either the ventilation path for circulating the primary air flow or the ventilation path for circulating the secondary air flow Or in both the ventilation channels, And it made larger than the inlet, thereby is to achieve the intended purpose.

  Further, the other means increases the opening of the flow path as the flow path length increases in either one or both of the flow outlet and the flow inlet of the plurality of flow paths divided by the flow path dividing unit. In this way, the intended purpose is achieved.

  Further, the other means is that the flow passage dividing portion has a bent portion, and the plurality of flow passages divided by the flow passage dividing portion are bent closest to the outlet and the outlet. The width of the plurality of flow paths positioned between the portions is increased as the flow path length is increased, thereby achieving the intended purpose.

  Another means is that the auxiliary rib is provided in the flow path having a width larger than the average flow path width in the ventilation path located between the outlet and the bent portion. To achieve this goal.

  Further, the other means may include a part of a range from the outlet end portion to a position where the remaining flow path width provided with the auxiliary rib is larger than the width of the flow path positioned upstream of the bent portion, or All the above-mentioned auxiliary ribs are provided, thereby achieving the intended purpose.

  Further, the other means is equipped with the heat exchange element according to any one of claims 1 to 5 for blowing the secondary airflow upstream of the inlet of the secondary airflow of the heat exchange element. A cooling unit provided with a centrifugal blower, and a heating element built in, located upstream of the primary air flow inlet of the heat exchange element, provided with a centrifugal blower for blowing the primary air flow, and integrated with the cooling unit This is a heating element storage device configured as described above, thereby achieving the intended purpose.

  As described above, according to the present invention, the drift in the ventilation passage is eliminated while maintaining the strength, the heat exchange efficiency of the heat exchange element is improved and the pressure loss is reduced, so that the cooling unit equipped with the heat exchange element is improved. Cooling performance can be improved.

The perspective view which shows the example of installation of Embodiment 1 of this invention Schematic showing the cross section of the heating element storage device Exploded perspective view of heat exchange element Exploded plan view of the heat exchange element (A) Perspective view of a conventional example, (b) Schematic showing a cross section of the conventional example

  The invention according to claim 1 of the present invention is a heat exchange element for exchanging heat by circulating a primary air flow and a secondary air flow every other stage of a ventilation path formed between a plurality of heat transfer plates laminated at a predetermined interval. The heat exchange element has a counterflow portion where the primary airflow and the secondary airflow are opposed to each other across the heat transfer plate, and the heat exchange element is connected to the primary airflow in the ventilation path. A shielding portion for preventing leakage of airflow from portions other than the inlet and outlet of the secondary airflow, and a flow passage dividing portion for dividing the inside of the ventilation passage into a plurality of flow passages, and the flow passage In the heat exchange element in which the flow lengths of the plurality of flow paths divided by the dividing section are different from each other, either or both of the ventilation path through which the primary airflow is circulated and the ventilation path through which the secondary airflow is circulated In the ventilation path, the outlet is more than the inlet The heat exchange element is formed with a larger opening area at the outlet than the opening area at the inlet. The pressure loss of the element can be reduced, so that the air volume can be increased and the cooling performance of the cooling unit can be improved. In addition, since a mechanism member other than the cooling unit is located in the vicinity of the outlet, the airflow flowing out from the outlet collides with the mechanism member and causes a large pressure loss, but the opening area of the outlet is larger than the opening area of the inlet. By forming it large, the wind speed of the airflow flowing out from the outlet can be made relatively small, and the pressure loss caused by the airflow colliding with the mechanism member can be reduced, so the air volume can be increased. The cooling performance of the cooling unit can be improved.

  Further, in the invention according to claim 2 of the present invention, as the flow path length becomes longer at one or both of the outlet and / or the inlet of the plurality of flow paths divided by the flow path dividing portion. The opening of the channel is made larger, and the opening of the channel formed by the channel dividing part is formed so that the opening becomes larger as the channel length becomes longer, so that the channel having a shorter channel length is formed. The pressure loss difference between the flow path and the long flow path can be reduced, the drift in the flow path can be eliminated, the heat exchange efficiency of the heat exchange element can be improved, and the cooling with the heat exchange element mounted The cooling performance of the unit can be improved.

  Moreover, the invention according to claim 3 of the present invention is such that the flow path dividing portion has a bent portion, and in the plurality of flow paths divided by the flow path dividing portion, the outlet and the The width of the plurality of flow paths located between the bent portions closest to the outflow port is increased as the flow path length increases, and the heat exchange element has a short flow path length and a flow path length. Can reduce the pressure loss difference with the long flow path, eliminate the drift in the flow path, improve the heat exchange efficiency of the heat exchange element, and the cooling performance of the cooling unit equipped with the heat exchange element Can be improved.

  According to a fourth aspect of the present invention, in the ventilation passage located between the outlet and the bent portion, an auxiliary rib is provided in a flow passage having a width larger than an average flow passage width. Yes, because it has the effect of suppressing the deformation of the heat transfer plate due to the pressure difference between the primary air flow and the secondary air flow during ventilation, eliminating uneven flow in the ventilation path while maintaining strength and reducing pressure loss It is possible to improve the cooling performance of the cooling unit equipped with the heat exchange element.

  In the invention according to claim 5 of the present invention, from the outlet end portion to a position where the remaining flow path width provided with the auxiliary rib is larger than the width of the flow path located upstream of the bent portion. The above-mentioned auxiliary ribs are provided in part or all of the above range, and the deformation of the heat transfer plate due to the pressure difference between the primary air flow and secondary air flow during ventilation is suppressed without increasing the pressure loss as a structure. Therefore, it is possible to eliminate the drift in the ventilation passage while maintaining the strength, to reduce the pressure loss, and to improve the cooling performance of the cooling unit equipped with the heat exchange element.

  According to a sixth aspect of the present invention, the heat exchange element according to any one of the first to fifth aspects is mounted, and upstream of the inlet of the secondary airflow of the heat exchange element, two A cooling unit provided with a centrifugal blower for blowing a secondary air flow, and a heating element, and a centrifugal blower for blowing the primary air flow are provided upstream of the primary air flow inlet of the heat exchange element. The cooling unit is integrated with the cooling unit, and the cooling unit eliminates the drift in the air passage while maintaining the strength according to claims 1 to 5, improving the heat exchange efficiency and reducing the pressure loss. The cooling performance of the cooling unit can be improved by mounting the heat exchange element that can be used.

(Embodiment 1)
In FIG. 1, reference numeral 1 denotes a building, and a mobile phone base station 3 is provided on the rooftop 2 thereof. The base station 3 has a box-shaped heating element storage device 4, a heating element 5 formed of a substrate for sending and receiving provided in the heating element storage device 4, and a front opening of the heating element storage device 4. Is provided with an openable / closable door 7 to which a cooling unit 6 is attached.

  As shown in FIG. 2, the cooling unit 6 includes a second suction port 8 and a second air outlet 9 for the outside air (second environment) and the heating element storage device 4 (first environment, hereinafter referred to as “inside air”). A main body case 12 having a first suction port 10 and a first air outlet 11, a secondary air flow centrifugal blower 13 for blowing outside air provided in the main body case 12, and outside air in the main body case 12 And a heat exchange element 14 for exchanging heat between the inside air, that is, the primary air flow and the secondary air flow.

  The heating element storage device 4 includes a primary airflow centrifugal blower 15 that blows hot air generated from the heating element 5 to the first suction port 10 of the cooling unit 6.

  As shown in FIG. 3, the heat exchange element 14 is made of a substantially rectangular synthetic resin, and is welded in a state where a plurality of unit elements A16 and unit elements B17, which are heat transfer plates, are alternately stacked at predetermined intervals. In addition, a plurality of unit elements A and unit elements B are integrated.

  The unit element A16 and the unit element B17 will be described in more detail with reference to FIG.

  The unit element A includes a shielding portion 18a, a flow path dividing portion 19a, and an auxiliary rib 20a. The first inflow port 16a and the first outflow port 16b are formed by the shielding portion 18a, and the flow path dividing portion. The flow path through which the primary airflow circulates is divided into five flow paths by 19a, and a substantially U-shaped flow path is formed so as to connect the first inlet 16a and the first outlet 16b. In addition, the five flow paths divided by the flow path dividing unit 19a have different lengths, and the effect of rectifying the primary air flow while maintaining the shape of the heat exchange element 14 in the three flow paths having a long flow path length is provided. An auxiliary rib 20a is provided. The opening area of the first outlet 16b is formed larger than the opening area of the first inlet 16a, and the openings of the five channels formed by the channel dividing part 19a have a channel length. As the length increases, the opening becomes larger. Further, the width of the flow path located at the bent portion 21a close to the first outlet 16b is increased as the flow path length increases.

  The unit element B includes a shielding part 18b, a flow path dividing part 19b, and an auxiliary rib 20b. The second inflow port 17a and the second outflow port 17b are formed by the shielding part 18b, and the flow path dividing part. The flow path through which the secondary airflow circulates is divided into five flow paths by 19b, and a substantially L-shaped flow path is formed so as to connect the second inlet 17a and the second outlet 17b. Further, the five flow paths divided by the flow path dividing portion 19b have different lengths, and the effect of rectifying the primary air flow is maintained in the three flow paths having a long flow path length while maintaining the shape of the heat exchange element 14. An auxiliary rib 20b is provided. The opening area of the second outlet 17b is formed larger than the opening area of the second inlet 17a, and the openings of the five channels formed by the channel dividing portion 19b have a channel length. As the length increases, the opening becomes larger. Further, the width of the flow path located at the bent portion 21b close to the second outlet 17b is increased as the flow path length increases.

  With the above configuration, the primary airflow is generated in the first suction port 10 provided in the main body case 12 of the cooling unit 6 by the heat generated from the heating element 5 in the heating element storage device 4 being sucked by the centrifugal fan 15 for the primary airflow. The airflow that is blown and flows into the first suction port 10 flows into the heat exchange element 14 from the first inlet 16a provided in the heat exchange element 14, and again generates heat from the first outlet through the first outlet 16b. It flows out into the space where the body 5 is provided. Further, the secondary air flow sucks outside air from the second suction port 8 provided in the main body case 12 of the cooling unit 6 by the action of the centrifugal air blower 13 for the secondary air flow, and the second air flow provided in the heat exchange element 14. It flows into the heat exchange element 14 from the inlet 17a, and flows out from the heating element storage device 4 through the second outlet port 17b to the outside through the second outlet port 9b.

  Therefore, the primary airflow warmed by the heating element 5 and the secondary airflow having a temperature lower than the primary airflow flow into the heat exchange element 14, and the primary airflow and the secondary airflow are generated by the unit elements A16 and B17 which are heat transfer plates. Heat exchange can be performed without mixing the airflow, and the heating element 5 is cooled by the primary airflow being cooled by the secondary airflow.

  Next, the operation and effect of the configuration of the heat exchange element 14 will be described.

  The heat exchange element 14 is formed such that the opening area of the first outlet 16b is larger than the opening area of the first inlet 16a, so that the opening areas of the first outlet 16b and the first inlet 16a are equal. Compared with the case, the pressure loss of the heat exchange element 14 can be reduced, so that the air volume can be increased and the cooling performance of the cooling unit can be improved. In addition, since the heating element 5 is located in the vicinity of the first outlet 16b, the airflow flowing out from the first outlet 16b collides with the heating element 5 and causes a large pressure loss. However, the opening area of the first outlet 16b is large. By forming it larger than the opening area of the 1st inflow port 16a, the wind speed of the airflow which flows out out of the 1st outflow port 16b can be made relatively small, and the pressure resulting from an airflow colliding with the heat generating body 5 Since the loss can be reduced, the air volume can be increased, and the cooling performance of the cooling unit 6 can be improved.

  Further, the opening area of the second outlet 17b is formed larger than the opening area of the second inlet 17a, so that the opening areas of the second outlet 17b and the second inlet 17a are equal. The pressure loss of the heat exchange element 14 can be reduced, so that the air volume can be increased and the cooling performance of the cooling unit 6 can be improved.

  Further, the openings of the five channels formed by the channel dividing unit 19a are formed so that the openings become larger as the channel length becomes longer, so that the channel having the shorter channel length and the channel length are longer. The pressure loss difference with the flow path can be reduced, the drift in the flow path can be eliminated, the heat exchange efficiency of the heat exchange element 14 can be improved, and the cooling of the cooling unit 6 on which the heat exchange element 14 is mounted is cooled. The performance can be improved.

  Further, the openings of the five channels formed by the channel dividing part 19b are formed so that the openings become larger as the channel length becomes longer, so that the channel having the shorter channel length and the channel length are longer. The pressure loss difference with the flow path can be reduced, the drift in the flow path can be eliminated, the heat exchange efficiency of the heat exchange element 14 can be improved, and the cooling of the cooling unit 6 on which the heat exchange element 14 is mounted is cooled. The performance can be improved.

  In addition, since the heat exchange element 14 is obtained by increasing the width of the flow path located at the bent portion 21b close to the second outlet 17b as the flow path length increases, the flow path and the flow path having a short flow path length. The pressure loss difference with the long flow path can be reduced, the drift in the flow path can be eliminated, the heat exchange efficiency of the heat exchange element 14 can be improved, and the cooling unit equipped with the heat exchange element 14 6 cooling performance can be improved.

  In addition, since the heat exchange element 14 is obtained by increasing the width of the flow path located at the bent portion 21a close to the first outlet 16b as the flow path length increases, the flow path and the flow path having a short flow path length. The pressure loss difference with the long flow path can be reduced, the drift in the flow path can be eliminated, the heat exchange efficiency of the heat exchange element 14 can be improved, and the cooling unit equipped with the heat exchange element 14 6 cooling performance can be improved.

  In the unit element A16, the five flow paths divided by the flow path dividing portion 19a have different lengths, and the three flow paths having a width larger than the average flow path width and the long flow length are in the three flow paths. An auxiliary rib 20a having the effect of maintaining the shape of the exchange element 14 and rectifying the primary airflow is provided, and the auxiliary rib 20a is larger than the width of the flow path formed by the flow path dividing portion 19a located upstream of the bent portion 21a. Because it is equipped to form a large flow path width, it suppresses deformation of the heat transfer plate due to the pressure difference between the primary air flow and secondary air flow during ventilation without increasing the pressure loss of the structure. Therefore, it is possible to eliminate the drift in the ventilation path while maintaining the strength, to reduce the pressure loss, and to improve the cooling performance of the cooling unit 6 equipped with the heat exchange element 14. . Here, the average channel width in the unit element A16 is an arithmetic average of the opening widths of the five channels formed by the shielding part 18a and the channel dividing part 19a located at the first outlet 16b.

  Further, in the unit element B17, the five flow paths divided by the flow path dividing portion 19b have different lengths, and in the three flow paths having a longer flow length than the average flow path width, An auxiliary rib 20b having the effect of maintaining the shape of the exchange element 14 and rectifying the primary airflow is provided, and the auxiliary rib 20b is larger than the width of the flow path formed by the flow path dividing portion 19b located upstream of the bent portion 21b. Because it is equipped to form a large flow path width, it suppresses deformation of the heat transfer plate due to the pressure difference between the primary air flow and secondary air flow during ventilation without increasing the pressure loss of the structure. Therefore, it is possible to eliminate the drift in the ventilation path while maintaining the strength, to reduce the pressure loss, and to improve the cooling performance of the cooling unit 6 equipped with the heat exchange element 14. . Here, the average channel width in the unit element B17 is an arithmetic average of the opening widths of the five channels formed by the shielding part 18b and the channel dividing part 19b located at the second outlet 17b.

  In the present embodiment, the unit element A16 forms a substantially U-shaped flow path so as to connect the first inlet 16a and the first outlet 16b, and the unit element B17 has the second inlet 17a and the first inlet 16a. Although the substantially L-shaped flow path is formed so as to connect the two outlets 17b, the flow path of the unit element A16 is substantially L-shaped, the flow path of the unit element B17 is substantially L-shaped, and the unit element A16. Even if the flow path of the unit element B17 is substantially U-shaped, the flow path of the unit element A16 is substantially L-shaped, and the flow path of the unit element B17 is substantially U-shaped. The effect of this can be obtained.

  As described above, the heat exchanging element of the present invention is a heat exchanging element that exchanges heat by circulating a primary air flow and a secondary air flow every other stage of a ventilation path formed between a plurality of heat transfer plates stacked at a predetermined interval. The heat exchange element has a counterflow portion where the primary airflow and the secondary airflow are opposed to each other across the heat transfer plate, and the heat exchange element is connected to the primary airflow in the ventilation path. A shielding portion for preventing leakage of airflow from portions other than the inlet and outlet of the secondary airflow, and a flow passage dividing portion for dividing the inside of the ventilation passage into a plurality of flow passages, and the flow passage In the heat exchange element in which the flow lengths of the plurality of flow paths divided by the dividing section are different from each other, either or both of the ventilation path through which the primary airflow is circulated and the ventilation path through which the secondary airflow is circulated In the ventilation path, the outlet should be the inlet The cooling unit equipped with the heat exchange element is cooled by eliminating the drift in the ventilation path while maintaining the strength, improving the heat exchange efficiency of the heat exchange element and reducing the pressure loss. Performance can be improved.

DESCRIPTION OF SYMBOLS 1 Building 2 Rooftop 3 Base station 4 Heating element storage apparatus 5 Heating element 6 Cooling unit 7 Door 8 2nd inlet 9 Second outlet 10 First inlet 11 First outlet 12 Main body case 13 Centrifugal blower for secondary airflow 14 Heat exchange element 15 Centrifugal blower for primary air flow 16 Unit element A
16a 1st inflow port 16b 1st outflow port 17 Unit element B
17a 2nd inflow port 17b 2nd outflow port 18a Shielding part 18b Shielding part 19a Channel division part 19b Channel division part 20a Auxiliary rib 20b Auxiliary rib 21a Bending part 21b Bending part

Claims (6)

A heat exchange element that exchanges heat by circulating a primary air flow and a secondary air flow every other stage of a ventilation path formed between a plurality of heat transfer plates that are stacked with a predetermined interval, wherein the heat exchange element is the primary exchange The airflow and the secondary airflow have a counterflow portion facing each other across the heat transfer plate, and the heat exchange element is other than the primary airflow and the secondary airflow inlet and outlet of the air passage. A plurality of the flow paths divided by the flow path dividing section and having a shielding section for preventing airflow leakage from the portion and a flow path dividing section for dividing the inside of the ventilation path into a plurality of flow paths In the heat exchange elements having different flow path lengths, an outlet is provided as an inlet in one or both of the ventilation path for circulating the primary airflow and the ventilation path for circulating the secondary airflow. Heat exchange, characterized by a larger than Element. In one or both of the outlet and / or the inlet of the plurality of channels divided by the channel dividing section, the opening of the channel is increased as the channel length increases. Item 2. The heat exchange element according to Item 1. The flow path dividing section has a bent portion, and a plurality of the flow paths divided by the flow path dividing section are positioned between the outlet and the bent portion closest to the outlet. The heat exchange element according to claim 1 or 2, wherein the width of the flow path is increased as the flow path length increases. 4. The heat exchange element according to claim 3, wherein an auxiliary rib is provided in a flow path having a width larger than an average flow path width in the ventilation path positioned between the outlet and the bent portion. The auxiliary rib is provided in part or all of the range from the outlet end to the position where the remaining flow path width is larger than the width of the flow path located upstream of the bent portion. The heat exchange element according to claim 4, wherein Cooling which mounts the heat exchange element as described in any one of Claim 1 to 5, and provided the centrifugal air blower for ventilating a secondary airflow upstream of the inflow port of the secondary airflow of the said heat exchange element A unit and a heating element, a heating fan housing integrated with the cooling unit, provided with a centrifugal fan for blowing the primary airflow, located upstream of the primary airflow inlet of the heat exchange element apparatus.

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