[et_pb_section fb_built=“1″ custom_padding_last_edited=“on|phone“ admin_label=“section“ _builder_version=“4.16″ custom_padding=“30px|0px|30px|0px“ custom_padding_tablet=““ custom_padding_phone=““ global_colors_info=“{}“][et_pb_row column_structure=“1_2,1_2″ _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“][et_pb_column type=“1_2″ _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“][et_pb_image src=“https:\/\/www.xenia-espresso.de\/wp-content\/uploads\/2018\/11\/aufheizen1.jpg“ title_text=“aufheizen1″ _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“][\/et_pb_image][\/et_pb_column][et_pb_column type=“1_2″ _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“][et_pb_image src=“https:\/\/www.xenia-espresso.de\/wp-content\/uploads\/2018\/11\/aufheizen3.jpg“ title_text=“aufheizen3″ _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“][\/et_pb_image][\/et_pb_column][\/et_pb_row][et_pb_row custom_padding_last_edited=“on|phone“ admin_label=“row“ _builder_version=“4.16″ background_size=“initial“ background_position=“top_left“ background_repeat=“repeat“ custom_padding=“30px|0px|0px|0px“ custom_padding_tablet=““ custom_padding_phone=“0px|0px|0px|0px“ global_colors_info=“{}“][et_pb_column type=“4_4″ _builder_version=“4.16″ custom_padding=“|||“ global_colors_info=“{}“ custom_padding__hover=“|||“][et_pb_text _builder_version=“4.16″ header_font_size=“18px“ background_size=“initial“ background_position=“top_left“ background_repeat=“repeat“ text_font_size_tablet=““ text_font_size_phone=““ text_font_size_last_edited=“on|phone“ header_font_size_tablet=““ header_font_size_phone=“14px“ header_font_size_last_edited=“on|phone“ border_style=“solid“ global_colors_info=“{}“]Bei der Xenia werden die Heizpatronen ja nur zum schnellen Anheizen genutzt, da eine Steuerung einer Br\u00fchgruppe \u00fcber Thermostat und Heizungen zu instabil ist.<\/p>\n
<\/p>\n
Once around 90 \u00b0C has been reached at the inner end of the brew group, the heaters can be switched off.<\/p>\n
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But then the rest of the machine is not yet warm enough and the thermal bridge does not transport enough heat to keep the brew group at the desired temperature. Since we can programme the control unit, we use a trick. We overheat the brew group with the fast heating cartridges, which in this phase supplies heat to the rest of the machine. After about 12\u201313 minutes this heat is distributed and the machine is really well heated through for a first good extraction. And from here on, the thermal bridge also supplies enough constant heat that the heating cartridges can be left out.<\/p>\n
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Without this overheating, the temperature would drop again to 90 \u00b0C or below for a longer period of time. In principle, you could also use heating cartridges with a lower output (approx. 2 x 50 watts) and then the brew group and machine would be ready at the same time\u2014but only after ~ 25 minutes.<\/p>\n
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The control unit signals this targeted overheating and transfer of heat to the machine by slowly flashing the brew group LED (2nd LED from the top). If the 2nd LED from above is off, the first espresso can be extracted without hesitation.<\/p>\n
\n[\/et_pb_text][et_pb_text _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“]<\/p>\n
When a machine is considered to be heated up is not really defined. In general, one can say: when the first extraction is essentially like the following. To this end, all relevant parts of the machine must (as far as possible) be at the correct temperature. Before developing the Xenia, we considered that we wanted a machine that would reach the right temperature quickly and that would also be heated through quickly - in other words, it would have a constant, steady temperature early on, which would hardly change afterwards.<\/p>\n
So the Xenia was developed accordingly.<\/p>\n
The following graphic shows the measurement curves of a Xenia for 2 measuring points in the brewing group\u2014which is certainly the most important element\u2014recorded over a longer period of time.
\nThe absolute numbers are less important in the following explanation because they are not particularly meaningful. And they always vary a little from machine to machine. Rather, it is about the development of the temperature over time and its meaning\/ relevance.<\/p>\n
One of the measuring points in the following diagram in the group is near the heat source (boiler) and one is more distant.
\n[\/et_pb_text][et_pb_image src=“https:\/\/www.xenia-espresso.de\/wp-content\/uploads\/2018\/11\/Aufheizen1.png“ title_text=“Aufheizen1″ _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“][\/et_pb_image][et_pb_text _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“]Wie man sehen kann, ist bei der Maschine (durch das \u00dcberheizen) nach 14 Minuten ziemlich genau die Temperatur in der Gruppe erreicht, die sie \u00fcber eine Stunde sp\u00e4ter immer noch hat. Diese Maschine liegt zu dem besagten Zeitpunkt sogar leicht \u00fcber dem Wert. Andere Maschinen k\u00f6nnen leicht darunter liegen.
\nViewed in this way, it can be said that the machine has almost exactly reached the operating temperature after 14 minutes without brewing. This is also shown by experience: after 13\u201315 minutes you can extract coffee with an output of 2 \u00d7 100 watts and will have a result that is very similar to the following extractions.<\/p>\n
In the case of an exposed brew group, however, there are parts that are very far away from the boiler as a heat source and, of course, do not heat up that quickly or do not get warm at all. Because of their small size, they are not as important as the 3.2 kg group. But you can check conditions at parts positioned further away. For example concerning the sieve or the shower screen. You can determine the temperature quite well on the shower screen. And this value is also a good comparison value with other machines, because this part is easily accessible on any machine in order to position a sensor. We placed a sensor at right angles from below on the metal of the bell near the centre for measurement.<\/p>\n
To assess the values of the Xenia, I determined the resting temperature for an E61-HX machine at the position of the shower screen. If we assume that a standard E61-HX machine is considered to have been heated through after 30 minutes, then at this point in time the shower strainer measured 77.5 \u00b0C. So this is the temperature for a fully heated E61-HX machine.
\n[\/et_pb_text][et_pb_image src=“https:\/\/www.xenia-espresso.de\/wp-content\/uploads\/2018\/11\/Aufheizen2.png“ title_text=“Aufheizen2″ _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“][\/et_pb_image][et_pb_text _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“]L\u00e4sst man die E61-Maschine noch l\u00e4nger aufheizen, pendelt sich die Ruhetemperatur am Duschsieb bei knapp 84\u00b0C ein. Es fehlen also nach 30 Minuten noch knapp 6\u00b0C zur Ruhetemperatur.<\/p>\n
If you look at the curve of the Xenia, you can see a different run of the curve:
\n[\/et_pb_text][et_pb_image src=“https:\/\/www.xenia-espresso.de\/wp-content\/uploads\/2018\/11\/Aufheizen3.png“ title_text=“Aufheizen3″ _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“][\/et_pb_image][et_pb_text _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“]Nach 14 Minuten ist die Temperatur am Duschsieb bei 79,2 \u00b0C \u2014 also ungef\u00e4hr bei dem Wert, bei dem die E61-Gruppe am Duschsieb nach 30 Minuten angekommen ist.<\/p>\n
Here is the video for the measurements as proof.
\n[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=“1_3,1_3,1_3″ _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“][et_pb_column type=“1_3″ _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“][\/et_pb_column][et_pb_column type=“1_3″ _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“][et_pb_video src=“https:\/\/www.youtube.com\/watch?v=PVysqUHiVec&t=1239s“ _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“][\/et_pb_video][\/et_pb_column][et_pb_column type=“1_3″ _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“][et_pb_column type=“4_4″ _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“][et_pb_text _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“]Das Ergebnis der Messungen entspricht dem was das Resultat der Entwicklung der Maschine war. Hier wurden \u00fcber einen l\u00e4ngeren Zeitraum viele Varianten\/ Parameter probiert, bis es zu dieser recht kurzen Aufheizzeit kam. Das wurde dann mit vielen Messungen an Maschinen \u00fcberpr\u00fcft. Auch wenn hier nur eine Messkurve einer Maschine dargestellt wird, wurden 8 Messungen an neuen Maschinen durchgef\u00fchrt und alle bringen \u2014 mit leichten Abweichungen \u2014 die gleichen Verl\u00e4ufe.
\nThe measurement on the E61-HX machine was repeated twice. However, it is conceivable that other E61-HX machines have different heat-up times. With empty extractions, you can certainly shorten the time with an E61-HX machine\u2014but possibly at the price of an unknown or deviating brewing temperature.<\/p>\n
So it is quite understandable and justified to say that the Xenia is completely operative after 14 minutes.
\n[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=“1_2,1_2″ _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“][et_pb_column type=“1_2″ _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“][et_pb_image src=“https:\/\/www.xenia-espresso.de\/wp-content\/uploads\/2018\/11\/aufheizen4.jpg“ title_text=“aufheizen4″ _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“][\/et_pb_image][\/et_pb_column][et_pb_column type=“1_2″ _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“][et_pb_image src=“https:\/\/www.xenia-espresso.de\/wp-content\/uploads\/2018\/11\/aufheizen2.jpg“ title_text=“aufheizen2″ _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“][\/et_pb_image][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>","protected":false},"excerpt":{"rendered":"
Bei der Xenia werden die Heizpatronen ja nur zum schnellen Anheizen genutzt, da eine Steuerung einer Br\u00fchgruppe \u00fcber Thermostat und Heizungen zu instabil ist. Sind rund 90 \u00b0C am inneren Ende der Br\u00fchgruppe erreicht, k\u00f6nnten die Heizungen also ausgeschaltet werden. Dann ist aber der Rest der Maschine noch nicht warm genug und die […]<\/p>","protected":false},"author":2,"featured_media":37608,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[338],"tags":[],"class_list":["post-63591","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-2-kreiser"],"_links":{"self":[{"href":"https:\/\/www.xenia-espresso.de\/en\/wp-json\/wp\/v2\/posts\/63591","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.xenia-espresso.de\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.xenia-espresso.de\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.xenia-espresso.de\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.xenia-espresso.de\/en\/wp-json\/wp\/v2\/comments?post=63591"}],"version-history":[{"count":1,"href":"https:\/\/www.xenia-espresso.de\/en\/wp-json\/wp\/v2\/posts\/63591\/revisions"}],"predecessor-version":[{"id":63593,"href":"https:\/\/www.xenia-espresso.de\/en\/wp-json\/wp\/v2\/posts\/63591\/revisions\/63593"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.xenia-espresso.de\/en\/wp-json\/wp\/v2\/media\/37608"}],"wp:attachment":[{"href":"https:\/\/www.xenia-espresso.de\/en\/wp-json\/wp\/v2\/media?parent=63591"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.xenia-espresso.de\/en\/wp-json\/wp\/v2\/categories?post=63591"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.xenia-espresso.de\/en\/wp-json\/wp\/v2\/tags?post=63591"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}