AU2021202148A1 - A laundry treating appliance having a heat pump system - Google Patents

Abstract

The present invention is related to a laundry treating appliance (10) comprising: - a cabinet (20); - a drum (30), rotatably housed within the cabinet (20), in which laundry can be loaded; - a heat pump system (40), using one or more flammable refrigerants, configured for exchanging heat with an operating fluid (50); - a circulating system (60) configured for circulating the operating fluid (50) through the drum (30), wherein the heat pump system (40) comprises a heat exchanger (70a, 70b) comprising: - a plurality of metallic pipes (80) wherein the flammable refrigerant flows; - a plurality of fins (90), stacked spaced and parallel to one another, each provided with four or more through-holes (100) suitable for housing one of the metallic pipes (80), wherein each of at least two through-holes (101) of the four or more through-holes (100) of each one of the fins (90) houses one of the metallic pipes (80), wherein at least two through-holes (102) of the four or more through-holes (100) of each one of the fins (90) do not house any of the metallic pipes (80). (Figure 2) C14 0 0 0 0' '0' 0 0 0 0 ---- ---- --- -- t-- ---------------------- -- 0 0 :o: :0 0 0 0 0 I I ICI o 0 0' 101 0 00 0 0 0 '0' 0 0 0 0 0 -- oi 00 0 0 0 0 0 8/ 0 0 01 :0: 0 j)0 0 00 00 -QI 00 NN 000 NN Ntoc cn 00 000

Description

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A LAUNDRY TREATING APPLIANCE HAVING A HEAT PUMP SYSTEM DESCRIPTION

The present invention refers to a laundry treating appliance,

for example a laundry washing machine (called also washing

machine), a laundry washer-drier (called also washer-drier), a

tumble drier, having a heat pump system.

Traditional laundry treating appliances, for example washing

machines, washer-driers, tumble driers, typically comprise a

cabinet containing a rotatable drum wherein the laundry to be

treated (i.e. washed and/or dried) can be loaded.

An operating fluid (e.g., depending on the kind of laundry

treating appliance and on the treating process to be applied,

water, water mixed with a washing/rinsing additive, air), is

circulated through the drum by a circulating system

(comprising, for example pumps, valves, fans, etc., depending

on the kind of fluid to be circulated).

In some known laundry treating appliances, the operating fluid

is heated and/or cooled/dehumidified by a heat pump system,

typically comprising a compressor, an expansion valve, two

heat exchangers (one operating as a condenser, and the other

as an evaporator), and conduits fluidly connecting such

elements in a closed circuit.

A heat pump system has an improved energy efficiency with

respect to traditional heating systems using an electrical

heater as heat source.

Some refrigerant flows through the compressor, the condenser,

the expansion valve and the evaporator, and through the

conduits connecting these to one another. The refrigerant releases heat to the operating fluid by means

of the condenser, and extracts heat and humidity from the

operating fluid by means of the evaporator. The compressor converts electromechanical power to thermal power by compressing the refrigerant in the refrigerant circuit

Currently, the refrigerants mainly used in heat pump systems

of known laundry treating appliances are hydrofluorocarbon

(HFC) refrigerants, in particular the ones known as R134a and

R407C. Unfortunately, these refrigerants have a high Global

Warming Potential (GWP), so alternative refrigerants start to

be more and more used in different industries.

Possible alternative refrigerants used for replacing

hydrofluorocarbon (HFC) refrigerants in heat pump systems of

laundry treating appliances are hydrocarbons refrigerants,

such as propane (R290) and propylene (R1270).

These alternative refrigerants have a negligible impact on GWP

and their thermo-physical properties makes them very suitable

for the typical working conditions of heat pump systems of

laundry treating appliances, in particular tumble driers and

washer-driers.

The downside of these alternative refrigerants is that they

are flammable, and therefore, for limiting possible risks,

regulations (e.g. the IEC 60335-2-11 standard) limit the

amount of refrigerant that can be charged in the heat pump

system to 150 g (grams).

Inside the heat pump system, when the compressor is switched

ON, most of the refrigerant can be found inside the condenser,

since in this heat exchanger the refrigerant is at high

pressure and, for a portion thereof, in liquid state, so with

a very high density.

The evaporator, on the contrary, works at low pressure, and

the refrigerant contained therein is mainly a liquid-vapour

mixture and a superheated vapour, so its density is quite low.

It has been observed that limiting to 150 g the refrigerant

charge could negatively affect the performances of the heat

pump system, in particular its energy efficiency.

There is the need, therefore, to reduce the volume of the

components of the heat exchangers wherein the refrigerant

flows, so as to limit the refrigerant charge required by the

system. On the other hand, it's important not reducing too

much the external surface area, so as to keep a good heat

exchange performance.

A known kind of heat exchanger, widely used in heat pump

systems of laundry treating appliances, comprises a plurality

of fins, typically made of aluminum and having a rectangular

plane, stacked in spaced and parallel planes; the fins

comprise a plurality of through-holes wherein a plurality

straight pipes, made of copper or aluminum, parallel one

another and perpendicular to the fins, are fitted, with their

lateral surface into close contact with the border of the

through-holes, so as to obtain an effective heat-exchange.

The straight pipes are connected in twos, at one end, by a

curved pipe, to define as a whole a single duct wherein the

refrigerant flows; this single duct has an inlet portion and

an outlet portion protruding from the stack of fins, and

connectable to the rest of the heat pump system circuit.

During the functioning of the heat pump system, the operating

fluid flows through the gaps between the fins, exchanging heat

with the latter, and therefore with the refrigerant flowing in

the pipes, which are thermally connected to the fins.

The fins used for producing such heat exchangers are typically

produced and sold with standardized dimensions, and with a

fixed number of through-holes; the producers of laundry

treating appliances using such a kind of heat exchangers, in

order to keep reduced the production costs, typically purchase

the available fins having external dimensions (i.e. length and

width) suitable for their appliances, stack them in spaced and

parallel planes, and insert in all the through-holes the same

number of straight pipes; typically the pipes are fastened to

the through-holes by radially expanding such pipes by suitable tools. Then, the straight pipes are connected in twos, at one end, by a curved pipe, to define as a whole the single duct wherein the refrigerant flows.

Since the external dimensions of the fins and the number of

through-holes is fixed, the freedom of design is very small.

In particular, in order to reduce the overall volume of the

single duct wherein the refrigerant flows, there is the

possibility to reduce the number of stacked fins, and

therefore the length of the straight pipes composing the

single duct; unfortunately, reducing the number of fins

reduces also the overall thermal exchange surface of the heat

exchanger, which reduces the energy efficiency of the heat

pump system.

The aim of the present invention is therefore obtaining a

laundry treating appliance using a heat pump system, having a

reduced Global Warming Potential (GWP) and an improved

efficiency, and at the same time keeping reduced the

production costs.

Within this aim, a further object of the invention is

obtaining a laundry treating appliance fulfilling the safety

regulations related to the refrigerant of the heat pump

system, without reducing the overall energy efficiency, and

and at the same time keeping reduced the production costs.

Applicant has found that, by leaving empty (i.e. not inserting

pipes therein) two or more through-holes of the fins of a heat

exchanger of the heat pump system, it is possible reducing the

overall internal volume of the single duct of the heat

exchanger wherein the refrigerant flows without reducing the

length of the single pipes composing such a single duct nor

the number of fins, and therefore without reducing the overall

thermal exchange surface, also using standard fins available

in the market having a prefixed number of through-holes, and

so without using customized fins which could increase the

production costs.

This inventive solution allows using in the heat pump system a

flammable refrigerant, like for example propane (R290) or

propylene (R1270), which have a very low Global Warming

Potential (GWP), but that needs to be used in small

quantities, and therefore requires a reduced volume of the

single duct of the heat exchanger wherein the refrigerant

flows.

In particular, above aim is solved by a laundry treating

appliance comprising:

- a cabinet;

- a drum, rotatably housed within the cabinet, in which

laundry can be loaded;

- a heat pump system, using one or more flammable

refrigerants, configured for exchanging heat with an operating

fluid;

- a circulating system configured for circulating the

operating fluid through the drum;

wherein the heat pump system comprises a heat exchanger

comprising:

-a plurality of metallic pipes wherein the flammable

refrigerant flows;

- a plurality of fins, stacked spaced and parallel to one

another, each provided with four or more through-holes

suitable for housing one of the metallic pipes,

wherein each of at least two through-holes of the four or more

through-holes of each one of the fins houses one of the

metallic pipes,

wherein at least two through-holes of the four or more

through-holes of each one of the fins do not house any of the

metallic pipes (or, in other words, they are not crossed by

any metallic pipe, or are free, or empty, from metallic

pipes).

Advantageously, the four or more through-holes of any fin of

the plurality of fins are respectively aligned with the four

or more through-holes of the rest of the plurality of fins.

In an advantageous embodiment, the perimeter edges of the

stacked fins define as a whole an envelope surface (i.e. a

surface that is tangent to the perimeter edges of all the

stacked fins) comprising at least a plane portion, and wherein

the four or more through-holes of each of the fins are

positioned on the respective fin to define at least one first

row perpendicular to the plane portion and/or at least one

second row perpendicular to the first rows.

In a preferred embodiment, the at least two through-holes of

the four or more through-holes not housing any of the metallic

pipes belong to a same second row.

More preferably, in the same second row, between at least two

through-holes not housing any of the metallic pipes there is

at least one of the through-holes housing one of the metallic

pipes; this advantageous embodiment ensures that the

distribution of the metallic pipes with respect to the fins is

quite uniform, and therefore that the heat distribution within

the heat exchanger is quite uniform.

In a further advantageous embodiment, at least two through

holes of the four or more through-holes not housing any of the

metallic pipes belong to a same first row.

Preferably, in this case in this same first row, between the

at least two through-holes not housing any of the metallic

pipes there is at least one of the through-holes housing one

of the metallic pipes; also this advantageous embodiment

ensures that the distribution of the metallic pipes with

respect to the fins is quite uniform, and therefore that the

heat distribution within the heat exchanger is quite uniform.

In a further advantageous embodiment, the fins comprise at

least two second rows, and at least two through-holes of the four or more through-holes not housing any of the metallic pipes belong to two contiguous second rows.

In a further advantageous embodiment, the fins comprise at

least two perpendicular rows, and at least two through-holes

of the four or more through-holes not housing any of the

metallic pipes belong to two contiguous perpendicular rows.

It is underlined that stating that two rows are contiguous

means that there aren't other rows positioned between such two

rows.

In another advantageous embodiment, all the through-holes of

the at least one first row and/or of the at least one second

row do not house any of the metallic pipes.

In a preferred embodiment, the metallic pipes comprise two or

more straight pipes, parallel one another and perpendicular to

the fins, each one of the two or more straight pipes being

housed in one of the four or more through-holes of the fins,

the two or more straight pipes being connected in twos, at one

end, by a curved pipe, to define as a whole a single duct

wherein the flammable refrigerant flows.

Further preferably, the single duct comprises an inlet portion

and an outlet portion configured for allowing said flammable

refrigerant respectively to enter/exit said single duct.

More preferably, the inlet portion and the outlet portion

protrude both from a same terminal fin of the plurality of

fins.

Preferably, the flammable refrigerant is or comprises a

hydrocarbon.

More preferably, the flammable refrigerant is or comprises

propane (R290) or propylene (R1270).

In a preferred embodiment, the fins are made of metal.

More preferably, the fins and/or the metallic pipes are made

of, or comprise, aluminum or aluminum alloy, or copper, or

copper alloy.

In an advantageous embodiment, the laundry treating appliance

is a tumble drier or washer-drier, and the operating fluid is

air.

In another advantageous embodiment, the laundry treating

appliance is a laundry washing machine, and the operating

fluid is water, or water mixed with a washing/rinsing agent.

Other advantages and features of a laundry treating appliance

according to the present invention will be clear from the

following detailed description, provided only as a not

limitative example, in which:

Fig 1 is a schematic lateral cross section of a laundry

treating appliance, in particular a tumble drier, according to

the invention;

Fig. 2 is a perspective view of a first embodiment of heat

exchanger of a laundry treating appliance according to the

invention;

Fig. 3 is a schematic plan view of a fin of a laundry treating

appliance according to the invention;

Fig. 4 is a lateral view of the heat exchanger of Fig.2;

Fig. 5 is a plan view of the heat exchanger of Fig.2;

Fig. 6 is a frontal view of the heat exchanger of Fig.2;

Fig. 7 is a rear view of the heat exchanger of Fig.2;

Fig. 8 is a perspective view of a second embodiment of heat

exchanger of a laundry treating appliance according to the

invention;

Fig. 9 is a lateral view of the heat exchanger of Fig.8;

Fig. 10 is a plan view of the heat exchanger of Fig.8;

Fig. 11 is a frontal view of the heat exchanger of Fig.8;

Fig. 12 is a rear view of the heat exchanger of Fig.8;

Fig. 13 is a perspective view of a second embodiment of heat

exchanger of a laundry treating appliance according to the

invention;

Fig. 14 is a lateral view of the heat exchanger of Fig.13;

Fig. 15 is a plan view of the heat exchanger of Fig.13;

Fig. 16 is a frontal view of the heat exchanger of Fig.13;

Fig. 17 is a rear view of the heat exchanger of Fig.13

Fig. 18 is a lateral schematic view of the stacked fins of an

heat exchanger according to the invention;

Fig. 19 is a schematic view of four through-holes of a fin of

a heat exchanger according to the invention.

In the figures, same parts are indicated with the same

reference numbers.

Advantageously, the laundry treating appliance 10 illustrated

in figure 1 is a tumble drier of the "horizontal axis type";

it is however clear that the invention can be applied, without

any substantial modification, also to tumble driers of the

vertical axis" type, and to washing machines and washer

driers, both of the "horizontal axis" and of the "vertical

axis" type.

The laundry treating appliance (being it a tumble drier 10, or

a washing machine or washer-drier, not illustrated) comprises

a cabinet 20, or housing, preferably parallelepiped,

configured to be positioned on a horizontal surface 2, for

example the floor of a building, preferably by suitable feet

21, one or more of which can have, advantageously, an

adjustable height, so as to adapt to a possible not perfect

planarity of the horizontal surface 2.

Advantageously, in the frontal wall 20a of the cabinet 20 an

access opening, not illustrated, is preferably obtained,

advantageously selectively closable by a loading/unloading

door 4, preferably hinged to the frontal wall 20a.

The laundry treating appliance (being it a tumble drier 10, or

a washing machine or washer-drier) comprises a drum 30

rotatably housed within the cabinet 20, in which the laundry,

not illustrated, can be loaded.

If the laundry treating appliance is a washing machine or a

washer-drier, both not illustrated, the cabinet 20 also houses

a washing tub, not illustrated, preferably suspended to the cabinet through springs and dumpers, also not illustrated, in which the drum 30 is rotatably contained.

The laundry treating appliance 10 comprises a circulating

system 60 configured for circulating an operating fluid

through the drum 3.

It is underlined that the circulating system 60 can define a

closed circuit for the operating fluid (i.e. the operating

fluid remains within the closed circuit during the laundry

treating process, and the same fluid, opportunely treated,

passed repeatedly through the drum 30), or it can define an

opened circuit for the operating fluid (i.e. the operating

fluid is loaded within the laundry treating appliance 10 at a

certain point of the laundry treating process, and it is

drained from the laundry treating appliance 10 at another

point of the laundry treating process).

In the advantageous embodiment in which the laundry treating

appliance 10 is a tumble drier, like the advantageous example

of figure 1, or a washer drier, not illustrated, the operating

fluid is or comprises air (represented by arrows 50), and the

circulating system preferably comprises an air circuit 61 and

one or more fans 62 configured for circulating such air 50

through the drum 3 and the air circuit 61.

If the laundry treating appliance is a tumble drier 10, it can

also advantageously comprise a lint filter 63, arranged in the

air circuit 61 for trapping lint or fluff released from the

laundry.

If the laundry treating appliance is a washing machine or a

washer drier, both not illustrated, the operating fluid is or

comprises water, or water mixed with a washing/rinsing

additive, and the circulating system preferably comprises a

water inlet circuit, not illustrated, adapted to feed water

into the tub, also not illustrated, and a drain circuit, also

not illustrated, adapted for draining washing/rinsing liquid

from the machine.

The laundry treating appliance 10 advantageously comprises a

heat pump system 40, configured for heating the operating

fluid, for example, in case of a tumble drier, the air 50.

Advantageously, the heat pump system 40 can also be configured

for cooling and dehumidifying the operating fluid.

Preferably, the heat pump system 40 comprises a compressor,

not illustrated, an expansion valve, also not illustrated, two

heat exchangers 70a, 70b (one operating as a condenser, and

the other as an evaporator), and conduits, not illustrated,

fluidly connecting such elements in a closed circuit.

A flammable refrigerant flows through the compressor, the

condenser 70a, the expansion valve and the evaporator 70b, and

through the conduits connecting these to one another.

The flammable refrigerant releases heat to the operating fluid

by means of the condenser 70a and extracts heat and humidity

from the operating fluid by means of the evaporator 70b. The

compressor converts electromechanical power to thermal power

by compressing the flammable refrigerant in the refrigerant

circuit.

The flammable refrigerant is or comprises a hydrocarbon,

preferably propane (R290) or propylene (R1270).

Advantageously, the heat exchangers, for example the condenser

a and/or the evaporator 70b, comprise a plurality of

metallic pipes 80 (called also simply pipes) wherein the

flammable refrigerant flows, and a plurality of fins 90

(advantageously metallic), stacked spaced and parallel to one

another, each provided with four or more through-holes 100

suitable for housing one of the metallic pipes 80.

Advantageously, the through-holes 100 of any fin 90 are

respectively aligned with the through-holes 100 of the rest of

the fins 90.

Advantageously, the perimeter edges 99 of the stacked fins 90

define as a whole an envelope surface, illustrated in figures and 18 with a dotted line numbered 92, comprising at least a plane portion 93.

Preferably, the fins 90 have a rectangular or square plan, in

which case the envelope surface 92 comprises four plane

portions, corresponding to the four sides of the rectangle or

square.

Preferably, the width of the fins 90 is comprised between 65

mm and 145 mm, more preferably between 95 mm and 125 mm.

Preferably, the height of the fins 90 is comprised between 110

mm and 185 mm, more preferably between 145 mm and 165 mm.

Preferably, the overall length of the stacked fins 90 is

comprise between 330 mm and 370 mm, more preferably between

200 mm and 250 mm.

Advantageously, the fins 90 are made of, or comprise, aluminum

or aluminum alloy, or copper, or copper alloy.

Advantageously, the more metallic pipes 80 are made of, or

comprise, aluminum or aluminum alloy, or copper or copper

alloy.

Preferably, the metallic pipes 80 comprise two or more

straight pipes 81, parallel one another and perpendicular to

the fins 90, each one of the two or more straight pipes 81

being housed in one of the through-holes 100 of the fins 90.

Advantageously, the straight pipes 81 are fitted, with their

lateral surface into close contact with the border of the

respective through-holes 100, so as to obtain an effective

heat-exchange between them; this can be obtained by radially

expanding such straight pipes 81 by suitable tools, not

illustrated.

Advantageously, the two or more straight pipes 81 are

connected in twos, at one end thereof, by a curved pipe 82, to

define as a whole a single duct 83 wherein the flammable

refrigerant flows.

Such a single duct 83 advantageously comprises an inlet

portion 831 and an outlet portion 832, configured for allowing the flammable refrigerant respectively to enter/exit the single duct; advantageously, the inlet portion 831 and the outlet portion 832 are fluidly connected or connectable to the other elements of the heat pump system 40, so as to allow circulation of the flammable refrigerant through the respective heat exchanger 70a or 70b.

Advantageously, like in the examples of attached figures, the

inlet portion 831 and an outlet portion 832 protrude both from

a same terminal fin 91 of the plurality of fins 90, which

simplifies the connection of the single duct 83 to the other

conduits of the heat pump system 40.

Advantageously, at least two through-holes 101 of the four or

more through-holes 100 of each fin 90 houses one of the

metallic pipes 80.

Advantageously, at least two through-holes 102 of the four or

more through-holes 100 of each fin 90 do not house any of the

metallic pipes 80 (or in other words they are not crossed by

any metallic pipe 80, or are free, or empty, from metallic

pipes 80).

In this way, the number of metallic pipes 80, and therefore

the overall internal volume of the single duct 83 composed of

such metallic pipes 80, wherein the flammable refrigerant

flows, is reduced, while the number of fins 90, and therefore

the overall length of their stack, can be relatively high, so

as to obtain a desired overall thermal exchange surface.

In an advantageous embodiment, four or more through-holes 100

of each fin 90 are positioned on the respective fin 90 to

define at least one first row 160 perpendicular to the plane

portion 93 of the envelope surface 92 and/or at least one

second row 150 perpendicular to the first rows 160.

For example, in case four through-holes 10, they can be all

aligned along to a single first row 160, or they can be all

aligned along a single second row 150, or they can be

positioned, as illustrated for example in figure 19, each at a vertex of a rectangle or square, so as to define, as a whole, two first rows 160 and two second rows 150.

In advantageous embodiments, like for example the ones

illustrated in figures 6, 11 and 16, at least two through

holes of the four or more through-holes 100 not housing any of

the pipes 80 belong to a same second row 150.

In an advantageous embodiment, like for example the one

illustrated in figure 6, in a same second row 150, between at

least two through-holes 102 not housing any metallic pipes 80

there is at least one through-hole 101 housing one metallic

pipes 80.

In advantageous embodiments, like for example the one

illustrated in figure 6, at least two through-holes 102 of the

four or more through-holes 100 not housing any metallic pipe

belong to a same first row 160.

In a preferred embodiment, like for example the one

illustrated in figure 6, in a same first row 160, between two

through-holes 102 not housing any metallic pipes 80 there is

at least one through-hole 101 housing one metallic pipe 80.

Preferably, the fins 90 comprise at least two second rows 150,

and, like for example ion the advantageous embodiments of

figures 6 and 11, at least two through-holes 102 not housing

any metallic pipe 80 belong to two contiguous second rows 150.

In a further advantageous embodiment, the fins 90 comprise at

least two of first rows 160, and, like for example in the

advantageous embodiments of figure 11 and 16, at least two

through-holes 102 not housing any metallic pipe 80 belong to

two contiguous first rows 160.

In a further advantageous embodiment, not illustrated, all the

through-holes 100 of a first row 160 and/or of one second row

150 do not house any of metallic pipe 80.

Anyway, different positionings of the at least two through

holes 102 are possible.

It is seen therefore how the invention achieves the proposed

aim and objects, since it allows obtaining, using commercially

available fins (which have prefixed dimensions and numbers of

through-holes), an evaporator for the heat pump system of a

laundry treating appliance having a relatively small volume of

the single duct wherein the refrigerant flows, and a high

overall thermal exchange surface; this evaporator, which

production costs are therefore kept reduced (since it does not

use customized fins), allows using in the heat pump system a

flammable refrigerant, like for example propane (R290) or

propylene (R1270), which have a very low Global Warming

Potential (GWP), fulfilling the regulation requirements

related to flammable refrigerant charge, and keeping at the

same time a high energetic efficiency.

Claims (15)

Claims

1. A laundry treating appliance (10) comprising: - a cabinet (20);

- a drum (30), rotatably housed within said cabinet (20), in which laundry can be loaded; - a heat pump system (40), using one or more flammable refrigerants, configured for exchanging heat with an operating fluid (50); - a circulating system (60) configured for circulating said operating fluid (50) through said drum (30); wherein said heat pump system (40) comprises a heat exchanger (70a, 70b) comprising: - a plurality of metallic pipes (80) wherein said flammable refrigerant flows; - a plurality of fins (90), stacked spaced and parallel to one another, each provided with four or more through holes (100) suitable for housing one of said metallic pipes (80), wherein each of at least two through-holes (101) of said four or more through-holes (100) of each one of said fins (90) houses one of said metallic pipes (80), characterized in that at least two through-holes (102) of said four or more through holes (100) of each one of said fins (90) do not house any of said metallic pipes (80).

2. A laundry treating appliance (10) according to claim 1, wherein the perimeter edges (99) of said stacked fins (90) define as a whole an envelope surface (92) comprising at least a plane portion (93), and wherein said four or more through holes (100) of each of said fins (90) are positioned on the respective fin (90) to define at least one first row (160) perpendicular to said plane portion (93) and/or at least one second row (150) perpendicular to said first rows (160).

3. A laundry treating appliance (10) according to claim 2,

wherein at least two through-holes (102) of said four or more

through-holes (100) not housing any of said metallic pipes

(80) belong to a same second row (150).

4. A laundry treating appliance (10) according to claim 3,

wherein in said same second row (150), between said at least

two through-holes (102) not housing any of said metallic pipes

(80) there is at least one of said through-holes (101) housing

one of said metallic pipes (80).

5. A laundry treating appliance (10) according to claim 2 or 3

or 4, wherein at least two through-holes (102) of said four or

more through-holes (100) not housing any of said metallic

pipes (80) belong to a same first row (160).

6. A laundry treating appliance (10) according to claim 5,

wherein in said same first row (160), between said at least

two through-holes (102) not housing any of said metallic pipes

(80) there is at least one of said through-holes (101) housing

one of said metallic pipes (80).

7. A laundry treating appliance (10) according to one or more

of claims 2 to 6, wherein said fins (90) comprise at least two

of said second rows (150), and wherein at least two through

holes (102) of said four or more through-holes (100) not

housing any of said metallic pipes (80) belong to two

contiguous second rows (150).

8. A laundry treating appliance (10) according to one or more

of claims 2 to 7, wherein said fins (90) comprise at least two of said first rows (160), and wherein at least two through holes (102) of said four or more through-holes (100) not housing any of said metallic pipes (80) belong to two contiguous first rows (160).

9. A laundry treating appliance (10) according to claim 2,

wherein all the through-holes (100) of said at least one first

row (160) and/or of said at least one second row (150) do not

house any of said metallic pipes (80).

10. A laundry treating appliance (100) according to one or

more of the previous claims, wherein said metallic pipes (80)

comprise two or more straight pipes (81), parallel one another

and perpendicular to said fins (90), each one of said two or

more straight pipes (81) being housed in one of said four or

more through-holes (100) of said fins (90), said two or more

straight pipes (81) being connected in twos, at one end, by a

curved pipe (82), to define as a whole a single duct (83)

wherein said flammable refrigerant flows.

11. A laundry treating appliance (100) according to claim 10,

wherein said single duct (83) comprises an inlet portion (831)

and an outlet portion (832) configured for allowing said

flammable refrigerant respectively to enter/exit said single

duct (83).

12. A laundry treating appliance (100) according to claim 11,

wherein said inlet portion (831) and said outlet portion (832)

protrude both from a same terminal fin (91) of said plurality

of fins (90).

13. A laundry treating appliance (10) according to one or more

of the previous claims, wherein said flammable refrigerant is or comprises a hydrocarbon or is or comprises propane (R290) or propylene.

14. A laundry treating appliance (10) according to one or more

of the previous claims, wherein said fins (90) and/or said

metallic pipes (80) are made of, or comprise, aluminum or

aluminum alloy, or copper, or copper alloy.

15. A laundry treating appliance (10) according to one or more

of the previous claims, wherein said laundry treating

appliance (10) is a tumble drier (11) or a washer-drier, and

said operating fluid (50) is air or wherein said laundry

treating appliance (10) is a laundry washing machine, and said

operating fluid (50) is water, or water mixed with a

washing/rinsing agent.

20a 20 30

50 4 1/8

63 50

21 Fig. 1

2 21 70b 70a 62 60 61 40

831 70b 150 99 90 99 100

90

102 160 832 83 2/8

91 100 92

82

80 93 Fig. 2 102 Fig. 3

81 90 99 83 82 80 102 101 91 101 90 832 102 831 102 102 102 102 160 102 82 82

102 102 101 160 82 81 Fig. 4 3/8

Fig. 6 82 Fig. 7 101 81 831 90 90 90

82 832

81 Fig. 5 99 91

831 99 70b

90

102 832 83

91 4/8

82

102 80 Fig. 8

90 81 91 150 160 82 90 99 832 102 \ 80 102 83 831 102

102

82 5/8

82 Fig. 9 Fig. 11 81 Fig. 12 90 81 831 90 90

82 832

Fig. 10 99 81 91

831 99 70b

90

102 832 83 6/8

91

102 80 Fig. 13 102

81 90 99 90 102 80 102 91 83 832 831 102

101 82 102 101 82 82 7/8

81 Fig. 14 Fig. 16 150 81 Fig. 17 101 90 90 90 831

82 832

81 Fig. 15 99 91

93 99 150 150 101 160

102 160

102 8/8

101 93 Fig. 18 Fig. 19