WO2012056165A1

WO2012056165A1 - System for heat exchange between the air inside a space and the air outside said space

Info

Publication number: WO2012056165A1
Application number: PCT/FR2011/052490
Authority: WO
Inventors: Cédric TEUILLIERES; Bernard Horber
Original assignee: Electricite De France
Priority date: 2010-10-29
Filing date: 2011-10-26
Publication date: 2012-05-03
Also published as: FR2966914A1; EP2633242A1; FR2966914B1; EP2633242B1

Abstract

The heat exchange system (1) comprises: a chamber having a horizontal plane (P); a condenser and an evaporator, at least one of which forms a finned heat exchanger (10, 20) including an exchange channel (40) substantially parallel to the horizontal plane (P) and a plurality of fins (45) perpendicular to said exchange channel (40); a heat-transfer fluid circuit connected to the condenser and the evaporator; and air circuits associated with the condenser and the evaporator respectively, at least one, which is associated with the finned heat exchanger (10, 20), being designed to circulate air vertically (Z) close to the finned heat exchanger (10, 20). According to the invention, each of the fins (45) of the finned heat exchanger (10, 20) includes a lower edge (50a) having at least one flow zone (53a) and at least one flow slope (54a) extending to the flow zone (53a), such as to guide the condensation water that forms on the evaporator along the lower edge (50a).

Description

Heat exchange system between air inside a space and air outside the space

The invention relates to a heat exchange system between air located inside a space and air located outside the space.

The invention applies in particular to the conditioning of the air located inside the space and, in particular, to the heating and cooling of the space. In such an application, a reversible air / air heat pump constituting the heat exchange system allows, in a heat pump mode, to take heat from the air located outside the space for the transfer to the air inside the space, and thus heat the space, or, in an air conditioner mode, to take heat from the air inside the space to transfer it to the air located outside the space, and thus cool the space. Such a heat exchange system uses two heat exchangers in which circulates a heat transfer fluid. The heat exchangers alternately form an evaporator, adapted to draw heat, and a condenser, adapted to transfer the heat.

In a known heat exchange system, to promote heat exchange, at least one of the heat exchangers comprises a plurality of fins perpendicular to a horizontally arranged exchange line.

During operation, because of the temperature differences between the heat transfer fluid in the evaporator and the air surrounding the evaporator, condensates consisting of drops of condensation water form on the evaporator. Condensate production can reach 0.5 l / h at 0.8 l / h per cooling kW.

The production and condition of the condensates in the heat exchange system is a function of the temperature of the air passing through the evaporator and its hygrometry. In air conditioner mode and heat pump mode, for an outside air temperature generally above 7 ° C, the condensates are maintained in the liquid state. Condensate production is continuous. In heat pump mode, for an outside air temperature generally below 7 ° C, the condensates freeze on the evaporator. The evaporator is then defrosted by cycle inversion, so that the condensates are liquefied. The production of condensates on the evaporator becomes instantaneous.

Whatever the mode of operation, a quantity of condensates remains accumulated on the fins. In heat pump mode, during icing, this accumulation of droplets on the evaporator accelerates the ice setting of the condensates. Condensate build-up and icing / defrosting phenomena affect the performance of the heat exchange system. EP 1 780 492 discloses an exchange system in which the heat exchanger has a plurality of fins, a lower edge of which has a flow slope towards a flow edge for discharging the condensates.

The invention aims to improve the evacuation of condensates in the heat exchange system.

For this purpose, the invention proposes a heat exchange system between air located inside a space and air located outside the space, said space having a floor, said heat exchange system comprising:

at least one enclosure delimiting a housing and comprising a base intended to be placed facing the floor of the space, said enclosure having a horizontal plane,

first and second heat exchangers forming one a condenser and the other an evaporator, at least one of said first and second heat exchangers forming a finned heat exchanger disposed in the housing of the enclosure, distance from the base in a vertical direction perpendicular to the horizontal plane, said finned heat exchanger having a central axis parallel to the horizontal plane and comprising an exchange line which extends substantially parallel to the horizontal plane, and a plurality of fins which extend transversely to the central axis from the exchange pipe, perpendicular to said exchange pipe, the exchange pipe comprising at least one row of pipes, said row of pipes comprising at least two pipes s extending in the same plane parallel to the horizontal plane, axially with respect to the central axis, each of the fins comprising at least two holes of passage through which said tubings extend, each of the fins of the finned heat exchanger having a bottom edge facing the base, said lower edge having at least one flow area placed near the base and at least one flow slope extending towards the base to said flow zone, so as to guide along the lower edge the flow of condensation water which forms on the evaporator,

a heat transfer fluid circuit connected to the first and second heat exchangers and adapted to circulate a heat transfer fluid in said first and second heat exchangers,

a first air circuit associated with the first heat exchanger for performing a heat exchange between the heat transfer fluid and the air located inside the space via the first heat exchanger, and a second heat circuit; associated with the second heat exchanger to achieve a heat exchange between the coolant and the air outside the space through the second heat exchanger, wherein at least one of said first and second air circuits associated with the finned heat exchanger is adapted to circulate the air in the vertical direction in the vicinity of the finned heat exchanger.

Thus, the flow area and the flow slope allow the edge effect to be eliminated at the lower edges of the fins. The invention makes it possible, in particular, to avoid the accumulation of condensates by improving the drainage control of the condensates by guiding them along the flow slope and their concentration at a point, the flow zone, where they flow then. The performance of the heat exchange system is improved.

These arrangements combined with the horizontal arrangement of the finned heat exchanger relative to the vertical air flow further promote the concentration and flow of condensates, thus improving the drainage of condensates. Indeed, the air circulating between the fins parallel to the gravitational flow of the water of condensation leads to an algebraic addition of the two forces that apply to the condensates for their elimination.

According to particular provisions, the heat exchange system according to the invention offers a specific arrangement allowing a dimensioning performed in a concern to reduce congestion and improve performance and modularity. These provisions simplify the architectural integration of the heat exchange system in order to allow commercial development.

In one embodiment, the flow slope may be provided on the lower edge of each of the fins, the flow slope deviating from the exchange line.

In particular, each of the vanes may further have an upper edge opposed to the lower edge and two lateral edges extending between the lower and upper edges. It can then be provided that the flow slope connects one of the side edges to the other side edge at which the flow area is arranged. Alternatively, it can be provided that the lower edge has at least two flow slopes respectively extending from the side edges and converging towards the flow area.

In a complementary or alternative manner to forming a slope on the lower edge of each of the fins, the finned heat exchanger can be inclined relative to the horizontal plane by an angle of less than 45 °, preferably less than 30 °. °, in particular less than 15 °.

The exchange conduit may comprise a plurality of rows of parallel pipes between them. In addition, the exchange pipe may have two ends between which the plurality of fins is disposed, the air circuit associated with the finned heat exchanger comprising an air inlet and an air outlet placed on the enclosure, and a fan placed in the housing of the enclosure substantially opposite one of the ends of the exchange pipe, the fan being adapted to circulate the air between the air inlet and the air outlet through the finned heat exchanger.

The heat exchange system may further comprise a drain pan arranged to collect the condensation water.

Other objects and advantages of the invention will appear on reading the following description of particular embodiments of the invention given by way of non-limiting example, the description being made with reference to the appended drawings in which:

FIG. 1 is a schematic representation of a heat exchange system according to one embodiment of the invention,

FIG. 2 is a diagrammatic representation in perspective of a heat exchanger of the heat exchange system of FIG. 1,

FIG. 3 is a representation of a fan-exchanger unit of the heat exchange system of FIG. 1, the fan-exchanger unit comprising a fan and the heat exchanger,

FIGS. 4 and 5 are diagrammatic perspective representations of variants of the heat exchanger of the heat exchange system of FIG.

In the figures, the same references designate identical or similar elements.

FIG. 1 represents a heat exchange system 1 in the form of an air / air heat pump for heating a space 2, such as a part of a dwelling, a technical room or other, delimited by a floor, generally horizontal, vertical walls and a roof. The heat pump is expected to be reversible so that the space 2 can also be cooled.

Thus, the heat exchange system 1 allows either to heat the space 2 by taking heat from the outside air located outside the space 2 (cold source) and by transferring to the indoor air located inside space 2 (hot source) the heat taken, or to cool the space 2 by taking heat from the indoor air (cold source) and transferring to the outside air (hot source) the heat taken.

In the embodiment shown, the heat exchange system 1 comprises an enclosure 3 delimiting a housing 4 in which all the components of the heat exchange system 1 is placed. Such an exchange system thermal 1 is said monobloc. The enclosure 3 is placed inside the space 2 to be conditioned, the heat exchange with the indoor air and the outside air being ensured through air inlets 5 and air outlets 6 formed. on the enclosure 3, and holes 7 formed in the walls or the roof of the space 2.

Although described in relation with a heat exchange system 1 monobloc, the invention also applies to a heat exchange system 1 said split comprising a first chamber disposed within the space 2 to be conditioned and receiving components intended to perform the heat exchange with the indoor air, and a second chamber disposed outside the space 2 to condition and receiving the components for performing the heat exchange with the outside air.

The enclosure 3 comprises a base placed facing the floor of the space 2. It is also expected that the enclosure 3 has a horizontal plane P, shown in FIG. 2, serving as a reference for the positioning of the heat exchange system. 1 when installed in the space 2. The horizontal plane P may be arranged in any appropriate manner in the enclosure 3. It may in particular be an outer surface of the enclosure 3 on a wall or on a fixing element of the enclosure 3, or on an edge of the enclosure 3, for example an edge of the base. It may also be an inner surface of the enclosure 3 intended to be covered by a removable wall. The horizontal plane P is placed parallel to the ground of the space 2 when it is horizontal.

The components of the heat exchange system 1 mentioned above are:

a first heat exchanger having first and second ends;

a second heat exchanger 20 having first 21 and second 22 ends,

- A coolant circuit connected to the first 10 and second 20 heat exchangers is adapted to circulate a coolant, such as a refrigerant, in the first 10 and second 20 heat exchangers.

The heat transfer fluid circuit comprises:

a compressor 30 connecting, via one or more pipes, the first end 1 1 of the first heat exchanger 10 to the second end 22 of the second heat exchanger 20,

an expander 31 connecting, via one or more conduits, the second end 12 of the first heat exchanger 10 to the first end 21 of the second heat exchanger 20, and a distribution circuit making it possible to circulate the heat-transfer fluid from the compressor to the first heat exchanger or from the compressor to the second heat exchanger in order to ensure the reversibility or invertibility of the heat transfer system; heat exchange 1.

In particular, the distribution circuit comprises a compression loop 32 in which the compressor 30 is placed, and a four-way valve 33 connecting the compression loop 32 to the first 10 and second 20 heat exchangers. The four-way valve 33 is adapted to circulate the heat transfer fluid from one of the first 10 and second 20 heat exchangers and entering the compression loop 32 to an inlet 34 of the compressor 30, and to distribute the heat transfer fluid from an outlet 35 of the compressor 30 to the other heat exchanger. In Figure 1, the circulation of the coolant in the compression loop 32 is shown by arrows.

Depending on the direction of circulation of the coolant, the heat exchange system 1 can operate in a heat pump mode or in an air conditioner mode.

In the heat pump mode shown in FIG. 1 with a circulation of the heat-transfer fluid represented by arrows referenced C, the coolant circulates in a closed loop from the compressor 30 to the first heat exchanger 10, via the valve. four channels 33, then through the expander 31 to the second heat exchanger 20 before returning to the compressor 30, through the four-way valve 33. The second heat exchanger 20 forms an evaporator collecting heat to the outside air and the first heat exchanger 10 forms a condenser transferring the heat to the indoor air, so as to heat the space 2.

In the air conditioner mode shown in FIG. 1 with a circulation of the heat-transfer fluid represented by arrows referenced F, the coolant circulates in a closed loop from the compressor 30 to the second heat exchanger 20, via the four-way valve. 33, then through the expander 31 to the first heat exchanger 10 before returning to the compressor 30, via the four-way valve 33. The first heat exchanger 10 forms the evaporator collecting heat to the indoor air and the second heat exchanger 20 form the condenser transferring the heat to the outside air, so as to cool the space 2.

The heat exchange system 1 also comprises a first air circuit associated with the first heat exchanger 10 to achieve a heat exchange between the heat transfer fluid and the air located inside the space 2 through the first heat exchanger 10. In particular, the first air circuit comprises ducts connected to the air inlet 5 and the air outlet 6 opening into the space 2, and a fan 15 placed in the housing 4 of the chamber 3 and adapted to circulate the air between the air inlet 5 and the air outlet 6 through the first heat exchanger 10. In Figure 1, the circulation of the indoor air through the first heat exchanger 10 is embodied by the arrows Al.

In the same way, a second air circuit is associated with the second heat exchanger 20 to achieve a heat exchange between the coolant and the air located outside the space 2 via the second heat exchanger. heat 20. In particular, the second air circuit comprises ducts connected to the air inlet 5 and the air outlet 6 opening out of the space 2, and a fan 25 placed in the housing 4 of the chamber 3 and adapted to circulate the air between the air inlet 5 and the air outlet 6 through the second heat exchanger 20. In Figure 1, the air flow outside through the second heat exchanger 20 is shown by the arrows AE.

To promote heat exchange, at least one of the first 10 and second 20 heat exchangers is a finned heat exchanger.

FIG. 2 shows the second heat exchanger 20 made in the form of a finned heat exchanger, it being understood that the arrangements described in connection with such an embodiment can be transposed to the production of the first heat exchanger 10 under the form of finned heat exchanger.

The second heat exchanger 20 extends generally along a central axis A and comprises an exchange pipe 40 of material adapted to conduct heat, such as metal. The exchange line 40, shown schematically by a mixed line in Figure 2, extends generally along the central axis A between two ends. The exchange pipe 40 comprises several rows 41 of pipes parallel to each other. In Figure 2, it is expected that the exchange pipe 40 comprises four rows 41 of tubing, only one is shown. Each row 41 of tubings comprises at least two tubings 42, for example six tubings in FIG. 2, extending in the same plane, axially with respect to the central axis A. The tubes 42 adjacent to each row 41 of tubings may to be interconnected by curved sections 43, U-shaped, arranged alternately at the ends of the exchange pipe 40. Alternatively, the exchange pipe 40 may have only one row 41 of tubings. The second heat exchanger 20 further comprises fins 45 parallel to each other, succeeding one another along the central axis A between the ends of the exchange pipe 40. The fins 45 comprise through holes 47 each adapted to allow the passage of one of the pipes 42 of the exchange pipe 40 through the fins 45. In particular, each fin 45 comprises several rows 46 of passage openings, four in Figure 2, each comprising at least two holes passage 47, six orifices of passage in Figure 2, aligned. The fins 45 are arranged transversely with respect to the central axis A and extend from the exchange pipe 40, perpendicularly thereto.

The fins 45 are formed by plates of material adapted to conduct heat, such as metal, each having a lower edge 50, an upper edge 51 opposite the lower edge 50 and two lateral edges 52 extending between the lower edges. 50 and above 51.

In FIG. 2, the fins 45 are rectangular, the lower 50 and upper 51 edges of each fin 45 being parallel to each other and the lateral edges 52 being perpendicular to the lower 50 and upper 51 edges.

The second heat exchanger 20 is disposed in the housing 4 of the enclosure 3, at a distance from the base in a vertical direction Z perpendicular to the horizontal plane P, with the central axis A extending parallel to a longitudinal direction of the horizontal plane P. Furthermore, the second heat exchanger 20 is disposed in the housing 4 of the enclosure 3 in such a way that the planes of the rows 41 of pipes of the exchange pipe 40 extend substantially parallel to the horizontal plane P, and that the lower edges of the fins 45 are placed facing the base of the enclosure 3. The exchange pipe 40 is said to be substantially parallel to the horizontal plane P in that it may be parallel to the horizontal plane P or inclined at an angle less than 45 ° with respect to the plane P.

In FIG. 2, the second heat exchanger 20 is inclined with respect to the horizontal plane P by an angle a less than 45 °, preferably less than 30 °, in particular less than 15 °, for example of the order of 10 °.

The second air circuit associated with the second heat exchanger 20 is then adapted to circulate the outside air in the vertical direction Z through the second heat exchanger 20.

In particular, as can be seen in FIG. 3, the second heat exchanger and the fan 25 of the second air circuit, for example a fan of centrifugal technology, can be placed in a housing 61, itself placed in the enclosure 3. The second heat exchanger 20 and the fan 25 thus form a fan block exchanger 60. Inside the housing 61, the fan 25 is placed substantially opposite one of the ends of the exchange pipe 40 of the second heat exchanger 20. As indicated above, such provisions concerning the second heat exchanger 20 and the second associated air circuit are transposable to the first heat exchanger 10 and the first associated air circuit.

The second heat exchanger 20 and the second air circuit make it possible to effectively drain the condensates consisting of drops of condensation water which form on the second heat exchanger 20 acting as an evaporator. Indeed, the air circulates between the fins 45 parallel to the gravitational flow of the condensates. This results in an algebraic addition of the two forces that apply to drops of condensation water for their removal at the lower edge 50.

In addition, because of the inclination of the second heat exchanger 20 relative to the horizontal plane P, the lower edges 50 of the fins 45 each have a flow zone 53, formed by a lower corner of the plate, placed in the vicinity of the base of the enclosure 3, and a flow slope 54 extending towards the base to the flow zone 53. The condensates reaching the lower edges 50 of the fins 45 are then guided along the slope 54 and discharged at a single point constituted by the flow zone 53.

It can then be provided to use a drain pan 70 placed under the second heat exchanger 20 to collect the condensation water and allow the evacuation by any suitable device. In particular, it is possible to provide an evacuation of the condensation water in the liquid state by a pipe, or the like, or by evacuation by misting, a high frequency vibration device, such as an ultrasound device being placed in a the drain pan 70.

In FIG. 3, the drainage tank 70 is integral with a bottom wall 62 of the casing 61, which lower wall 62 is inclined towards an inlet opening placed in correspondence with the drainage tank 70 to allow the flow of the condensation water dripping from the flow zones 53 of the fins 45 in the drain pan 70.

The invention is not limited to the arrangement of the second heat exchanger 20 and to the shape of the vanes 45 previously described for producing the flow zone 53 and the flow slope 54.

In particular, in variants illustrated in FIGS. 4 and 5, the flow zone 53a, 53b and the flow slope 54a, 54b are formed on the lower edge 50a, 50b of each of the fins 45a, 45b, the slope 54a deviating from the exchange line 40. The flow zone 53a, 53b and the flow slope 54a, 54b then result from the only particular conformation of the lower edge 50a, 50b. The exchange line 40 is parallel to the horizontal plane P, the upper edges 51a, 51b are parallel to the horizontal plane P and the lateral edges 52a, 52b are perpendicular to the horizontal plane P.

In the variant of FIG. 4, the lower edge 50a is inclined, the flow slope 54a connecting one of the lateral edges 52a to the other lateral edge 52a at which the flow zone 53a formed by a wedge is arranged.

In the variant of FIG. 5, the lower edge 50b has at least two flow slopes 53b respectively extending from the lateral edges 52b and converging towards the centrally arranged flow zone 53b.

The conformation of the lower edge 51 to form the flow zone 53 and the flow slope 54 makes it possible to reduce the space requirement in a transverse direction, perpendicular to the vertical Z and longitudinal directions, of the second heat exchanger 20.

The invention is however not limited to the forms described above and illustrated in FIGS. 4 and 5 of the lower edge 50. In particular, the flow slopes 54 represented as being rectilinear can be curved, likewise the flow zones 53 represented as being angular may be rounded or flat with a reduced dimension. In addition, the flow zones 53 are not necessarily placed at the ends or at the center of the lower edges 50. More than one flow zone 53 and more than two flow slopes 54 may also be provided. provide a lower edge 50 provided with a toothing or a corrugation. Furthermore, the fins 45 may have any polygonal contour other than rectangular. One can also provide a circular or elliptical contour.

On the other hand, although illustrated as an alternative to the inclination of the second heat exchanger 20 with respect to the horizontal plane P, it is possible to combine the conformation of the lower edge 50 so that the flow slope 54 away from the exchange line 40 at the inclination of the second heat exchanger 20.

The provisions relating to the second heat exchanger 20 and to the second air circuit, which have been described previously and which can be applied to the first heat exchanger 10 and to the first air circuit, make it possible to obtain a better distribution of heat. the air over the entire exchange surface of the second heat exchanger 20 so that the entire exchange surface is exploited (no dead zone). This makes it possible to optimize the dimensioning of the fan-exchanger unit 60 and thus reduce the bulk of the heat exchange system 1. The increase in the number of rows 41 of tubings allows the second heat exchanger 20 to approach a real heat exchanger against the current. The heat exchange is only more favorable and increases the performance of the heat exchange system 1. The use of the fan-exchanger unit 60 with a slip-type heat transfer fluid would, because of the existence of a sliding, reduce the nip, that is to say the minimum distance between the two fluids exchanging.

Claims

1. A heat exchange system (1) between air within a space (2) and air outside the space (2), said space (2) having a soil, said heat exchange system (1) comprising:

at least one enclosure (3) delimiting a housing (4) and comprising a base intended to be placed facing the floor of the space (2), said enclosure (3) having a horizontal plane (P),

- first (10) and second (20) heat exchangers forming one a condenser and the other an evaporator, at least one of said first (10) and second (20) heat exchangers forming a heat exchanger vane disposed in the housing (4) of the enclosure (3), away from the base in a vertical direction (Z) perpendicular to the horizontal plane (P), said finned heat exchanger (10, 20) having a central axis (A) parallel to the horizontal plane (P) and comprising an exchange line (40) which extends substantially parallel to the horizontal plane (P), and a plurality of fins (45) which extend transversely through with respect to the central axis (A), from the exchange pipe (40), perpendicular to said exchange pipe (40), the exchange pipe (40) comprising at least one row (41) of pipes, said row (41) of pipes comprising at least two pipes (42) extending in the same plane parallel to the horizon plane tal (P), axially with respect to the central axis (A), each of the fins (45) comprising at least two through-holes (47) through which said tubings (42) extend, each of the fins (45) ) of the finned heat exchanger (10, 20) having a lower edge (50; 50a; 50b) positioned opposite the base, said lower edge (50; 50a; 50b) having at least one flow area (53; 53a; 53b) located near the base and at least one flow slope (54; 54a; 54b) extending downwardly to said flow region (53; 53a; 53b) so as to guide the water flow of the water along the bottom edge (50; 50a; 50b); condensation that forms on the evaporator,

a heat transfer fluid circuit connected to the first (10) and second (20) heat exchangers and adapted to circulate a heat transfer fluid in said first (10) and second (20) heat exchangers,

a first air circuit associated with the first heat exchanger (10) for performing a heat exchange between the heat transfer fluid and the air located inside the space (2) via the first heat exchanger (10), and a second air circuit associated with the second heat exchanger (20) to perform an exchange between the heat transfer fluid and the air outside the space (2) via the second heat exchanger (20),

said heat exchange system (1) being characterized in that at least one of said first and second air circuits associated with the finned heat exchanger (10, 20) is adapted to circulate the air according to the vertical direction (Z) in the vicinity of the finned heat exchanger (10, 20).

The heat exchange system (1) according to claim 1, wherein the flow slope (54a; 54b) is provided on the lower edge (50a; 50b) of each of the vanes (45a; flow (54a; 54b) away from the exchange line (40).

The heat exchange system (1) according to claim 2, wherein each of the fins (45a) further has an upper edge (51a) opposite the lower edge (50a) and two lateral edges (52a) extending between the lower (50a) and upper (51a) edges, the flow slope (54a) connecting one of the side edges (52a) to the other side edge (52a) at which the flow area ( 53a) is arranged.

The heat exchange system (1) according to claim 2, wherein each of the fins (45b) further has an upper edge (51b) opposite the lower edge (50b) and two lateral edges (52b) extending between the lower (50b) and upper (51b) edges, the lower edge (50b) having at least two flow slopes (54b) extending respectively from the side edges (52b) and converging towards the flow region (53b).

5. Heat exchange system (1) according to any one of claims 1 to 4, wherein the finned heat exchanger (10, 20) is inclined relative to the horizontal plane (P) of a lower angle at 45 °, preferably less than 30 °, especially less than 15 °.

6. heat exchange system (1) according to any one of claims 1 to 5, wherein the exchange pipe (40) comprises a plurality of rows (41) of parallel pipes between them.

7. heat exchange system (1) according to any one of claims 1 to 6, wherein the exchange pipe (40) has two ends between which the plurality of fins (45) is disposed, the circuit d air associated with the finned heat exchanger (10, 20) comprising an air inlet (5) and an air outlet (6) placed on the enclosure (3), and a fan (15, 25) ) placed in the housing (4) of the enclosure (3) substantially opposite one of the ends of the exchange pipe (40), the fan (15, 25) being adapted to circulate the air between the air inlet (5) and the air outlet (6) through the finned heat exchanger (10, 20).

8. heat exchange system (1) according to any one of claims 1 to 7, further comprising a drain pan (70) arranged to collect the condensation water.