{"id":38195,"date":"2019-02-02T05:53:54","date_gmt":"2019-02-02T04:53:54","guid":{"rendered":"https:\/\/www.xenia-espresso.de\/?p=38195"},"modified":"2022-10-22T16:54:52","modified_gmt":"2022-10-22T14:54:52","slug":"preinfusion","status":"publish","type":"post","link":"https:\/\/www.xenia-espresso.de\/en\/preinfusion\/","title":{"rendered":"Pre-Infusion"},"content":{"rendered":"

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We did not use a pre-infusion chamber when designing the brew group for various reasons.<\/p>\n

Pre-infusion is a sensible measure to obtain extractions of more or less constant quality, although this also depends on other factors. Espresso extractions with light types of coffee\u2014with and without pre-infusion\u2014will always flow more unevenly than extractions with classically roasted beans. You can see this very nicely when using a bottomless portafilter.<\/p>\n

Many machines use a chamber for pre-infusion in which, in principle, the water first collects in order to soak the ground coffee (puck), which then swells and is therefore less susceptible to the formation of channels (so-called channeling).<\/p>\n

However, we have designed the Xenia in such a way that there is a very slow and even pressure build-up (approx. 10 seconds until the full pressure is applied). This gives the coffee grounds time to swell and the pre-infusion chamber can be completely omitted.<\/p>\n

This is achieved through the choice of the pump and a flow reduction in the water circuit for the espresso extraction. This prevents the water from penetrating the ground coffee unhindered at full pressure, causing channels that result in a thin and poorly extracted espresso.<\/p>\n

The diffuser has a supporting effect, dividing the water into 16 channels in front of the shower screen, which are arranged according to a carefully thought-out pattern.<\/p>\n

[\/et_pb_text][et_pb_text _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“]<\/p>\n

Explained in more detail<\/h2>\n

 <\/p>\n

[1] Pump \u2014> Brew Group<\/h3>\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_image src=“https:\/\/www.xenia-espresso.de\/wp-content\/uploads\/2019\/02\/pre1.png“ title_text=“pre1″ _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“][\/et_pb_image][et_pb_image src=“https:\/\/www.xenia-espresso.de\/wp-content\/uploads\/2019\/02\/pre2.png“ title_text=“pre2″ _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“][\/et_pb_image][et_pb_image src=“https:\/\/www.xenia-espresso.de\/wp-content\/uploads\/2019\/02\/pre3.png“ title_text=“pre3″ _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“][\/et_pb_image][\/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=“{}“]<\/p>\n

In principle, this section only consists of pipes and hoses with an inner diameter of 4 mm. The only special features are: A valve that clears the way to the group and an expansion valve that limits the pressure to 10 bar (the pump delivers up to 19 bar).<\/p>\n

[\/et_pb_text][et_pb_text _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“]<\/p>\n

[2] Brew Group \u2014> Ground Coffee<\/h3>\n

Here we have given some thought to how we manage the water in the brew group.<\/p>\n

In the group there is a channel with a diameter of 5 mm which, after approx. 80 mm, bends down into the round portafilter holder.<\/p>\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_image src=“https:\/\/www.xenia-espresso.de\/wp-content\/uploads\/2019\/02\/pre4.png“ title_text=“pre4″ _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“][\/et_pb_image][\/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=“{}“]<\/p>\n

So that the water cannot rush through this channel unchecked, the cross-section of this waterway has been reduced from 5 mm to 1 mm. This is what the so-called turbulator (a spiral) does.<\/p>\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_image src=“https:\/\/www.xenia-espresso.de\/wp-content\/uploads\/2019\/02\/pre5.png“ title_text=“pre5″ _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“][\/et_pb_image][\/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=“{}“]<\/p>\n

In addition, the turbulator stabilises the temperature in the brewing water. We determined this in tests and measurements and this technology has proven itself well.<\/p>\n

The water comes out in the middle:<\/p>\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_image src=“https:\/\/www.xenia-espresso.de\/wp-content\/uploads\/2019\/02\/pre6.png“ title_text=“pre6″ _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“][\/et_pb_image][\/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=“{}“]<\/p>\n

... and merges with the portafilter holder. It has a small recess with 4 channels leading down to which the water is divided.<\/p>\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_image src=“https:\/\/www.xenia-espresso.de\/wp-content\/uploads\/2019\/02\/pre7.png“ title_text=“pre7″ _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“][\/et_pb_image][et_pb_image src=“https:\/\/www.xenia-espresso.de\/wp-content\/uploads\/2019\/02\/pre8.png“ title_text=“pre8″ _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“][\/et_pb_image][\/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=“{}“]<\/p>\n

This is how it looks from below:<\/p>\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_image src=“https:\/\/www.xenia-espresso.de\/wp-content\/uploads\/2019\/02\/pre9.png“ title_text=“pre9″ _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“][\/et_pb_image][\/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=“{}“]<\/p>\n

The water from these 4 holes is absorbed by the diffuser.<\/p>\n

The diffuser is a stainless steel plate that is shaped on one side to match the curvature of the shower screen. Our tests have shown that this is the ideal shape.<\/p>\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_image src=“https:\/\/www.xenia-espresso.de\/wp-content\/uploads\/2019\/02\/pre10.png“ title_text=“pre10″ _builder_version=“4.16″ _module_preset=“default“ global_colors_info=“{}“][\/et_pb_image][\/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_section]<\/p>","protected":false},"excerpt":{"rendered":"

Wir haben bei der Konstruktion der Br\u00fchgruppe auf eine Preinfusionskammer aus verschiedenen Gr\u00fcnden verzichtet. Preinfusion ist eine durchaus sinnvolle Ma\u00dfnahme, um Bez\u00fcge etwas konstanter zu gestalten, wobei das aber auch von anderen Faktoren abh\u00e4ngt. Bez\u00fcge mit hellen Sorten werden \u2014 mit und ohne Preinfusion \u2014 immer deutlich unruhiger laufen als Bez\u00fcge mit klassisch ger\u00f6steten Bohnen. […]<\/p>","protected":false},"author":2,"featured_media":56356,"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":[339],"tags":[],"class_list":["post-38195","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technik"],"_links":{"self":[{"href":"https:\/\/www.xenia-espresso.de\/en\/wp-json\/wp\/v2\/posts\/38195","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=38195"}],"version-history":[{"count":13,"href":"https:\/\/www.xenia-espresso.de\/en\/wp-json\/wp\/v2\/posts\/38195\/revisions"}],"predecessor-version":[{"id":56357,"href":"https:\/\/www.xenia-espresso.de\/en\/wp-json\/wp\/v2\/posts\/38195\/revisions\/56357"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.xenia-espresso.de\/en\/wp-json\/wp\/v2\/media\/56356"}],"wp:attachment":[{"href":"https:\/\/www.xenia-espresso.de\/en\/wp-json\/wp\/v2\/media?parent=38195"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.xenia-espresso.de\/en\/wp-json\/wp\/v2\/categories?post=38195"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.xenia-espresso.de\/en\/wp-json\/wp\/v2\/tags?post=38195"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}