U.S. patent application number 16/579948 was filed with the patent office on 2020-01-16 for method for preparing a fresh brewed cold coffee beverage and coffee machine for conducting such method.
The applicant listed for this patent is Schaerer AG. Invention is credited to Steven Eckenhausen, Rudi Truninger.
Application Number | 20200015622 16/579948 |
Document ID | / |
Family ID | 50774596 |
Filed Date | 2020-01-16 |
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United States Patent
Application |
20200015622 |
Kind Code |
A1 |
Truninger; Rudi ; et
al. |
January 16, 2020 |
METHOD FOR PREPARING A FRESH BREWED COLD COFFEE BEVERAGE AND COFFEE
MACHINE FOR CONDUCTING SUCH METHOD
Abstract
An energy-saving method for preparing a fresh brewed cold coffee
beverage including the steps of: a. filling a brewing means (13)
with a predetermined quantity of coffee powder; b. brewing a hot
coffee beverage by pushing hot water and/or hot steam through the
predetermined quantity of coffee powder in the brewing means (13);
c. cooling down the hot coffee beverage by exclusively bringing it
in thermal contact with a stream of cold water; and d. dispensing
the cooled-down coffee beverage at a coffee outlet (17).
Inventors: |
Truninger; Rudi; (Long
Beach, CA) ; Eckenhausen; Steven; (Long Beach,
CA) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Schaerer AG |
Zuchwil |
|
CH |
|
|
Family ID: |
50774596 |
Appl. No.: |
16/579948 |
Filed: |
September 24, 2019 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
14505738 |
Oct 3, 2014 |
10478011 |
|
|
16579948 |
|
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
A47J 31/56 20130101;
A47J 31/42 20130101; A47J 31/469 20180801; A47J 31/4403
20130101 |
International
Class: |
A47J 31/56 20060101
A47J031/56; A47J 31/42 20060101 A47J031/42 |
Foreign Application Data
Date |
Code |
Application Number |
Apr 1, 2014 |
CH |
00498/14 |
Claims
1. A coffee machine (10) for preparing a fresh brewed cold coffee
beverage, said coffee machine comprising a brewing means (13) for
brewing a coffee beverage with an inlet for hot water and an outlet
for a brewed coffee beverage, and a coffee outlet (17) which is
connected to the outlet of said brewing means (13) by outlet piping
means (27, 24, 29, 24'), wherein the brewing means (13) is filled
with a predetermined quantity of coffee power and a hot coffee
beverage is brewed by pushing hot water and/or hot steam through
said predetermined quantity of coffee power in said brewing means
(13); and at least one heat exchanger (14, 14') with a primary and
a secondary side for cooling down said hot coffee beverage by
exclusively bringing said hot coffee beverage in thermal contact
with a stream of cold water, the at least one heat exchanger (14,
14') inserted with said primary side into said outlet piping means
(27, 24, 29, 24') leading from the outlet of said brewing means
(13) to said coffee outlet (17), and the secondary side of which is
connected with a cold water inlet (15), wherein the fresh brewed
cold coffee beverage is dispensed from the coffee outlet (17).
2. The coffee machine as claimed in claim 1, wherein said coffee
machine (10) comprises a boiler (11) with an inlet and an outlet,
whereby said inlet of said boiler (11) is connected to said cold
water inlet (15) by means of a first cold water feed pipe (15a) and
said outlet of said boiler (11) dispenses hot water and/or hot
steam for brewing said coffee beverage to said inlet of said
brewing means (13), and that said at least one heat exchanger (14)
is inserted with its secondary side into said first cold water feed
pipe (15a).
3. The coffee machine as claimed in claim 1, wherein said secondary
side of said at least one heat exchanger (14') is further connected
with a cooling water discharge pipe (31) such that cooling water
flowing through said secondary side from said cold water inlet (15)
is discharged through said cooling water discharge pipe (31).
4. The coffee machine as claimed in claim 2, wherein a further heat
exchanger (14') is provided, having a primary side and a secondary
side, that said further heat exchanger (14') is inserted with its
primary side into said outlet piping means (27, 24, 29, 24')
leading from the outlet of said brewing means (13) to said coffee
outlet (17), that said further heat exchanger (14') is connected on
its secondary side with said cold water inlet (15) and with a
cooling water discharge pipe (31) such that cooling water flowing
through said secondary side from said cold water inlet (15) is
discharged through said cooling water discharge pipe (31).
5. The coffee machine as claimed in claim 4, wherein said primary
sides of said at least one heat exchanger (14) and said further
heat exchanger (14') are arranged in series within said outlet
piping means (27, 24, 29, 24') leading from the outlet of said
brewing means (13) to said coffee outlet (17).
6. The coffee machine as claimed in claim 4, wherein said primary
sides of said at least one heat exchanger (14) and said further
heat exchanger (14') are arranged in parallel within said outlet
piping means (27, 24, 29, 24') leading from the outlet of said
brewing means (13) to said coffee outlet (17).
7. The coffee machine as claimed in claim 1, wherein cold water
adding means (15b, 19, 22) are provided for adding cold water to
the coffee beverage flowing out of said at least one heat exchanger
(14) to said coffee outlet (17).
8. The coffee machine as claimed in claim 7, wherein said cold
water adding means comprises a second cold water feed pipe (15b)
which connects said outlet piping means (27, 24, 29, 24') after
said at least one heat exchanger (14) to said cold water inlet
(15).
9. The coffee machine as claimed in claim 8, wherein a controllable
valve (22) is inserted into said second cold water feed pipe (15b)
and is connected to a controller (16) of said coffee machine (10)
for controlling the quantity of cold water added.
10. The coffee machine as claimed in claim 1, wherein the primary
side of said at least one heat exchanger (14) can be bridged by a
hot beverage pipe (25) to which the outlet of said brewing means
(13) can be switched over from said outlet piping means (27, 24,
29, 24').
11. The coffee machine as claimed in claim 1, wherein said brewing
means comprise a brewing unit (13) with a closable brewing chamber
(23) into which freshly ground coffee powder can be fed from a
grinder (12) and through which pressurized hot water from a boiler
(11) flows during brewing of the coffee beverage.
12. The coffee machine as claimed in claim 11, wherein said grinder
(12) is integrated into said coffee machine (10).
13. The coffee machine as claimed in claim 11, wherein said brewing
unit (13) is opened and closed automatically.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a divisional of and claims benefit of
U.S. patent application Ser. No. 14/505,738 filed on Oct. 3, 2014,
and Swiss Application No. 00498/14 filed on Apr. 1, 2014, the
entire disclosures of which are hereby incorporated herein by
reference.
BACKGROUND OF THE INVENTION
[0002] The present invention relates to the field of preparation of
beverages. It refers to a method for preparing a fresh brewed cold
coffee beverage according to the preamble to Claim 1.
[0003] The invention further refers to a coffee machine for
conducting such method.
PRIOR ART
[0004] Document EP 2 130 466 A1 describes a machine for the
preparation of beverages, which comprises a device for the
preparation of coffee or tea to which water heated in a heat
exchanger is delivered. The brewed beverage can then be dispensed
as required either directly at a first outlet or is sent through a
cooling arrangement equipped with a Peltier element and is then
dispensed in cooled form at a second outlet.
[0005] The document EP 2 238 876 B1 discloses a method for
producing a fresh cold coffee beverage from a predetermined
quantity of ground coffee, comprising the following method steps:
(S1) delivering the predetermined quantity of ground coffee into a
brewing chamber; (S2) producing a coffee concentrate from the
delivered predetermined quantity of ground coffee by means of a
brewing process in the brewing chamber, wherein the coffee
concentrate thus produced has a predeterminable multiple of a
concentration (KN) of a normal drinking quality of filter coffee
with approximately 1.2 to 1.4% dry substance; (S3) producing a
fresh cold coffee beverage by mixing the coffee concentrate thus
produced with a quantity of water which corresponds to a
predeterminable multiple (VM) of the quantity of fresh coffee
concentrate produced. A heat exchanger is not provided here.
[0006] The document EP 2 268 175 B1 describes a method for
producing a beverage, wherein a cold beverage, in particular iced
coffee, is produced continuously from a hot beverage, in particular
coffee/espresso, produced in a beverage preparation appliance by
means of a hot beverage preparation device, in particular
coffee/espresso, immediately following the hot beverage preparation
without direct addition of cooling agents, in particular ice, iced
water or cooling elements, in the same beverage preparation
appliance by means of a cooling device. Downstream of the cooling
device in terms of flow, water, in particular cooled water, from a
water source can be admixed with the cooled hot beverage. The
cooling device comprises at least one first heat exchanger having
at least one first flow channel arrangement for a beverage to be
cooled, said arrangement being fluidically connected at the outlet
end to a (cold) beverage outlet of the beverage preparation device,
and a cooling assembly connected to the heat exchanger. In all
cases active cooling means are employed.
[0007] The document EP 2 478 803 A1 discloses a machine for
dispensing hot and cold beverages with a brewing chamber which is
supplied with hot water for brewing the beverage. The brewed
beverage can either be directly dispensed hot or for cooling can be
sent through a heat exchanger which is connected to a cooling unit.
Here too active cooling is employed.
[0008] The document U.S. Pat. No. 4,550,651 describes a coffee
machine in which hot brewing water is delivered to a brewing
basket. The brewed coffee flows into a holding and cooling tank and
is then heated in portions as required in a heat exchanger which
takes heat from a brewing water reservoir. The freshly brewed
coffee can be cooled in the holding and cooling tank, as it gives
off heat in a heat exchanger to fresh water which is delivered to
the brewing water reservoir.
[0009] The document U.S. Pat. No. 5,724,883 discloses a coffee
machine for brewing hot and cold beverages. For production of a
cold coffee beverage the freshly brewed hot filter coffee is
subjected to a three-stage cooling process which provides air
cooling in a first stage, a heat exchange with freshly delivered
water in the second stage and a heat exchange with a cooling
cartridge in a third stage.
[0010] The document WO 2007/072374 A2 describes a coffee machine in
which the cooling of the brewed beverage takes place by external
addition of ice.
[0011] In the solution given in WO 2009/081299 A1 as well as the
addition of ice the temperature of the water required for the
brewing process is also lowered.
[0012] WO 2012/036635 A1 discloses a coffee machine in which, as
required, before dispensing, the hot brewed beverage is led through
a cooling chamber operating with Peltier elements for cooling.
[0013] All known coffee machines which provide for dispensing of a
cold or significantly cooled coffee beverage are either of
complicated construction or require additional energy for cooling,
which is necessary for special active cooling arrangements such as
Peltier elements or cooling circuits operating with a
compressor.
[0014] In this case it should also be taken into consideration that
a cooling of the coffee beverage must take place only in so far as
subsequently added ice cubes do not melt immediately and
excessively dilute the beverage from the outset.
SUMMARY OF THE INVENTION
[0015] It is therefore an object of the invention to create a
coffee machine which in a simple and energy-saving manner enables
the selective dispensing of hot or cooled coffee.
[0016] A further object of the invention is to provide a method for
operating such a coffee machine.
[0017] This and other objects are achieved by the features of
Claims 1 and 14.
[0018] Method for preparing a fresh brewed cold coffee beverage
according to the invention comprises the steps of. [0019] a)
filling a brewing means with a predetermined quantity of coffee
powder; [0020] b) brewing a hot coffee beverage by pushing hot
water and/or hot steam through said predetermined quantity of
coffee powder in said brewing means; [0021] c) cooling down said
hot coffee beverage by exclusively bringing it in thermal contact
with a stream of cold water; and [0022] d) dispensing said
cooled-down coffee beverage at a coffee outlet.
[0023] An embodiment of the inventive method is characterized in
that said thermal contact preferably comprises a heat exchange
between said hot coffee and a first stream of cold water in at
least one heat exchanger.
[0024] Another embodiment of the inventive method is characterized
in that said thermal contact further comprises admixing a
predetermined quantity of cold water in a second stream with the
coffee beverage coming from said at least one heat exchanger before
the coffee beverage is dispensed at said coffee outlet.
[0025] Another embodiment of the inventive method is characterized
in that said hot water and/or hot steam used for said brewing step
is prepared in a boiler, and that said first stream of cold water
is fed into said boiler after said heat exchange in said at least
one heat exchanger.
[0026] A further embodiment of the inventive method is
characterized in that said first stream of cold water is discharged
after said heat exchange in said at least one heat exchanger.
[0027] Just another embodiment of the inventive method is
characterized in that said thermal contact comprises a first heat
exchange between said hot coffee and a first stream of cold water
in a first heat exchanger and a second heat exchange between said
hot coffee and a second stream of cold water in a second heat
exchanger.
[0028] Specifically, said first and second heat exchanges are
conducted one after the other.
[0029] Specifically, said first and second heat exchanges are
conducted in parallel.
[0030] Specifically, said first and second heat exchanges are
conducted alternatively.
[0031] Specifically, said hot water and/or hot steam used for said
brewing step is prepared in a boiler, and said first stream of cold
water is fed into said boiler after said heat exchange in said
first heat exchanger, and said second stream of cold water is
discharged after said heat exchange in said at second heat
exchanger.
[0032] A further embodiment of the inventive method is
characterized in that for the production of a preselected coffee
beverage a specific total amount of cold water is associated with a
specific quantity of coffee powder, and that when cold water is
admixed the quantity of hot water used for brewing is
correspondingly reduced.
[0033] Specifically, the quantities of hot water used for brewing
and of admixed cold water are controlled by a controller by means
of corresponding valves.
[0034] Another embodiment of the inventive method is characterized
in that said coffee powder provided for brewing is automatically
ground and fed into said brewing means.
[0035] The coffee machine for conducting said method according to
the invention comprises a means for brewing a coffee beverage with
an inlet for hot water and an outlet for the brewed coffee
beverage, and a coffee outlet which is connected to the outlet of
said brewing means by outlet piping means
[0036] It is characterized in that for cooling of the brewed coffee
at least one heat exchanger with a primary and a secondary side is
provided, which is inserted with its primary side into said outlet
piping means leading from the outlet of said brewing means to said
coffee outlet, and the secondary side of which is connected with a
cold water inlet.
[0037] An embodiment of the inventive coffee machine is
characterized in that said coffee machine comprises a boiler with
an inlet and an outlet, whereby said inlet of said boiler is
connected to said cold water inlet by means of a first cold water
feed pipe and said outlet of said boiler dispenses hot water and/or
hot steam for brewing said coffee beverage to said inlet of said
brewing means, and that said at least one heat exchanger is
inserted with its secondary side into said first cold water feed
pipe.
[0038] Another embodiment of the inventive coffee machine is
characterized in that said secondary side of said at least one heat
exchanger is further connected with a cooling water discharge pipe
such that cooling water flowing through said secondary side from
said cold water inlet is discharged through said cooling water
discharge pipe.
[0039] Specifically, a further heat exchanger is provided, having a
primary side and a secondary side, that said further heat exchanger
is inserted with its primary side into said outlet piping means
leading from the outlet of said brewing means to said coffee
outlet, that said further heat exchanger is connected on its
secondary side with said cold water inlet and with a cooling water
discharge pipe such that cooling water flowing through said
secondary side from said cold water inlet is discharged through
said cooling water discharge pipe.
[0040] More specifically, said primary sides of said first and
second heat exchangers are arranged in series within said outlet
piping means leading from the outlet of said brewing means to said
coffee outlet.
[0041] Alternatively, said primary sides of said first and second
heat exchangers may be arranged in parallel within said outlet
piping means leading from the outlet of said brewing means to said
coffee outlet.
[0042] A further embodiment of the inventive coffee machine is
characterized in that means are provided for adding cold water to
the coffee beverage flowing out of said at least one heat exchanger
to said coffee outlet.
[0043] Specifically, said cold water adding means comprises a
second cold water feed pipe which connects said outlet piping means
after said at least one heat exchanger to said cold water
inlet.
[0044] More specifically, a controllable valve is inserted into
said second cold water feed pipe and is connected to a controller
of said coffee machine for controlling the quantity of cold water
added.
[0045] Just another embodiment of the inventive coffee machine is
characterized in that the primary side of said at least one heat
exchanger can be bridged by a hot beverage pipe to which the outlet
of said brewing means can be switched over from said outlet piping
means.
[0046] A further embodiment of the inventive coffee machine is
characterized in that said brewing means comprise a brewing unit
with a closable brewing chamber into which freshly ground coffee
powder can be fed from a grinder and through which pressurized hot
water from a boiler flows during brewing of the coffee
beverage.
[0047] Specifically, said grinder is integrated into said coffee
machine.
[0048] Specifically, said brewing unit is opened and closed
automatically.
BRIEF DESCRIPTION OF THE DRAWINGS
[0049] The present invention is now to be explained more closely by
means of different embodiments and with reference to the attached
drawings.
[0050] The invention is explained in greater detail below with
reference to embodiments in connection with the drawings. In the
drawings:
[0051] FIG. 1 shows a highly simplified schematic view of a coffee
machine with cooling devices comprising a single heat exchanger
according to an embodiment of the invention;
[0052] FIG. 2 shows another embodiment of the inventive coffee
machine with two heat exchangers in series connection; and
[0053] FIG. 3 shows a further embodiment of the inventive coffee
machine with two heat exchangers in series connection.
DETAILED DESCRIPTION OF DIFFERENT EMBODIMENTS OF THE INVENTION
[0054] FIG. 1 shows the highly simplified construction and
operating diagram of an automatic coffee machine according to an
embodiment of the invention.
[0055] The coffee machine 10 comprises as central component a
brewing unit 13 which may be of different construction depending
upon the type of brewing process used. In the illustrated example a
brewing method is indicated, wherein freshly ground coffee powder
is fed into a brewing chamber 23 delimited by two pistons movable
relative to one another and there hot brewing water flows from the
bottom upwards through the coffee powder. Such a brewing unit is
described for example in the document EP 2 036 466 A1 in the name
of the applicant.
[0056] The hot water necessary for the brewing process is produced
in an (electrically heated) boiler 11 which is connected at the
outlet end to the inlet of the brewing unit 13 and at the inlet end
receives cold fresh water from a cold water inlet 15 via a cold
water feed pipe 15a. The cold water inlet 15 can be connected
directly to an external water supply or to an internal storage tank
for fresh water.
[0057] The coffee beverage coming out of the brewing unit 13 at the
top is delivered by means of a switchover valve 21 selectively via
a first hot beverage pipe 27 and a cold beverage pipe 24 or a
second hot beverage pipe 25 to a coffee outlet 17, and there it is
dispensed into a container 18, a cup, a mug or the like. The
switchover valve 21 is actuated by a central controller 16 which
controls the outflow of the preparation depending upon the input
beverage selection.
[0058] The first hot beverage pipe 27 and cold beverage pipe 24 are
connected to the primary side of a heat exchanger 14, whilst the
cold water inlet 15 and cold water feed pipe 15a are connected to
the secondary side heat exchanger 14 with cold water feed pipe 15a
leading to boiler 11. The heat exchanger 14 transfers heat from the
hot coffee beverage flowing through the primary side to the fresh
cold water flowing through the secondary side on its way to boiler
11. In this way the brewed beverage is significantly cooled in a
first step, whilst the fresh water flowing to the boiler 11 is
preheated in an energy-saving manner. On the other hand, if
switchover valve 21 is switched over, hot brewed beverage is
conveyed via bypassing hot beverage pipe 25 to the outlet 17, and
the heat exchange does not occur and the usual hot beverage is
dispensed.
[0059] Thus as a result there is a possibility that both hot and
also cooled coffee can be dispensed directly from the machine. A
central element in this idea is the heat exchanger 14 just before
the coffee outlet 17, through which on the one hand the hot coffee
and on the other hand the cold water, which preferably goes into
the boiler 11, run. With this heat exchanger 14 the coffee is
cooled to a certain degree.
[0060] In addition, a second element is that cold water can be
added directly to the coffee already cooled in heat exchanger 14
and thus the coffee beverage is cooled further. For this purpose a
second cold water feed pipe 15b which opens into the pipe leading
to the coffee outlet 17 branches off from the cold water inlet 15
and can be opened by actuating valve 22. By adding cold fresh water
a direct heat exchange takes place between the two liquids.
[0061] The result of the two-stage cooling process is a coffee
which is warm at approximately 30-35.degree. C. and is dispensed
into a mug with ice (if on the other hand the hot coffee at
90.degree. C. were dispensed into the mug with ice, the ice would
immediately melt completely; on the other hand with the warm coffee
at 35.degree. C. the quantity of ice is sufficient in order to cool
the coffee to almost 0.degree. C. and there is still some ice
remaining).
[0062] However, the possibility also exists of bypassing the heat
exchanger 14, by sending the hot brewed beverage via the hot
beverage pipe 25, and subsequently effecting cooling by the
addition of cold water via the cold water feed pipe 15b. In this
way in principle three different types of cooling are available,
namely (1) cooling only by means of heat exchanger 14, (2) cooling
only by the addition of cold water and (3) two-stage cooling by
heat exchanger 14 and the addition of cold water.
[0063] The addition of cold water in the second cooling step
changes the concentration of the brewed beverage by dilution. It is
therefore advantageous that for the production of a preselected
coffee beverage a specific total amount of cold water is associated
with a specific quantity of coffee powder and that when cold water
is admixed the quantity of hot water used for brewing is
correspondingly reduced, so that the total quantity of water
remains unchanged. However, it is also conceivable to provide other
recipes for the cold coffee beverage than for a hot beverage.
[0064] In order that the quantities of hot water used for brewing
and of added cold water can be controlled precisely by the
controller 16, in the illustrated embodiment of FIG. 1
corresponding controllable valves 20 and 22 are disposed in the
associated pipes from the boiler 11 to the brewing unit 13 and in
the cold water feed pipe 15b and connected to the controller 16. In
addition the cold water feed pipes 15a and 15b can be provided with
flow meters 19 and 26 which measure the quantity of water flowing
through and transmit the values to the controller 16.
[0065] FIG. 1 shows an embodiment as a fully automatic coffee
machine which has an integrated grinder 12 in which coffee is
freshly ground and fed automatically into the (then opened) brewing
chamber 23.
[0066] However, the invention can also be employed in other coffee
machines with individual preparation, such as for example the
hand-filled portafilter machines or so-called 3/4 automatic
machines (see the document WO 2013/117362 A1), or machines in which
the coffee powder for brewing is provided in capsules or sachets
and introduced into the brewing unit.
[0067] FIG. 2 shows in a detail another embodiment of the inventive
coffee machine. In this embodiment two different heat exchangers 14
and 14' are used to cool down the brewed coffee beverage. The first
heat exchanger 14 plays the same roll as in the embodiment of FIG.
1 and cools the hot coffee beverage by means of a heat exchange
with the cold fresh water flowing through cold water feed pipe
15a.
[0068] A second cooling step can be initiated by switching over a
switchover valve 28, which is arranged in cold beverage pipe 24.
The coffee beverage cooled down in heat exchanger 14 then flows to
the primary side of second heat exchanger 14' via a connecting pipe
29. In heat exchanger 14' a second heat transfer takes place
between the coffee beverage and cold fresh water, which flows
through the secondary side of heat exchanger 14' from cold water
inlet 15 to a cooling water discharge pipe 31 to be discharged
there. The flow of cold water through the secondary side of heat
exchanger 14' can be controlled by a valve 30 and is independent of
the fresh water requirements of boiler 11. In this way, by
combining the two cooling steps within the two heat exchangers 14
and 14', the cooling process can be optimized. When the cooled
coffee beverage leaves second heat exchanger 14' through second
cold beverage pipe 24' there is still the possibility to add a
third cooling step by admixing cold water, as described in
connection with the embodiment in FIG. 1.
[0069] In the embodiment of FIG. 2 the two heat exchangers 14 and
14' are arranged in a series arrangement. However, heat exchangers
14 and 14' may be arranged in a parallel arrangement, as shown in
FIG. 3. Here, switchover valves 32 and 33 are used to elect one of
the heat exchangers 14 and 14' to cool down the brewed coffee
beverage by heat exchange with fresh cold water, which is either
supplied to boiler 11 (when heat exchanger 14 is used) or
discharged through cooling water discharge pipe 31 (when heat
exchanger 14' is used). Instead of an alternative use of heat
exchangers 14 and 14', both may be used in parallel, so that part
of the heat of the hot coffee beverage is transferred to boiler 11,
and part of the heat is discharged through cooling water discharge
pipe 31. It is clear that both scenarios can be combined with the
subsequent admixture of cold fresh water, as described in
connection with the embodiment in FIG. 1.
LIST OF REFERENCE NUMERALS
[0070] 10 coffee machine [0071] 11 boiler [0072] 12 grinder [0073]
13 brewing unit [0074] 14,14' heat exchanger [0075] 15 cold water
inlet [0076] 15a,b cold water feed pipe [0077] 16 controller [0078]
17 coffee outlet [0079] 18 container (mug, cup etc.) [0080] 19,26
flow meter [0081] 20 valve [0082] 21,22 switchover valve [0083] 23
brewing chamber [0084] 24,24' cold beverage pipe [0085] 25,27 hot
beverage pipe [0086] 30 valve [0087] 29 connecting pipe [0088] 31
cooling water discharge pipe [0089] 28,32,33 switchover valve
* * * * *