{"id":335,"date":"2020-08-04T10:37:23","date_gmt":"2020-08-04T09:37:23","guid":{"rendered":"https:\/\/mango-projects.co.uk\/?page_id=335"},"modified":"2020-08-04T10:59:36","modified_gmt":"2020-08-04T09:59:36","slug":"the-passivhaus-definition","status":"publish","type":"page","link":"https:\/\/mango-projects.co.uk\/the-passivhaus-definition\/","title":{"rendered":"The Passivhaus Definition"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"335\" class=\"elementor elementor-335\">\n\t\t\t\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-6807dc08 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"6807dc08\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-541ba031\" data-id=\"541ba031\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-1ba6b901 elementor-widget elementor-widget-text-editor\" data-id=\"1ba6b901\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.18.0 - 29-11-2023 *\/\n.elementor-widget-text-editor.elementor-drop-cap-view-stacked .elementor-drop-cap{background-color:#69727d;color:#fff}.elementor-widget-text-editor.elementor-drop-cap-view-framed .elementor-drop-cap{color:#69727d;border:3px solid;background-color:transparent}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap{margin-top:8px}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap-letter{width:1em;height:1em}.elementor-widget-text-editor .elementor-drop-cap{float:left;text-align:center;line-height:1;font-size:50px}.elementor-widget-text-editor .elementor-drop-cap-letter{display:inline-block}<\/style>\t\t\t\t<!-- wp:heading -->\n<h1>The Passivhaus Definition<\/h1>\n<!-- \/wp:heading --><!-- wp:paragraph -->\n<p>Passivhaus is a standard for housing design developed by Professor Wolfgang Feist of the Passivhaus Institute in Germany. The passivhaus standard sets out a way to reduce energy use for space heating and cooling by 90% compared to a traditional build house.<\/p>\n<!-- \/wp:paragraph --><!-- wp:image {\"id\":76,\"sizeSlug\":\"large\"} -->\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"683\" class=\"wp-image-76\" src=\"https:\/\/mango-projects.co.uk\/wp-content\/uploads\/2020\/05\/AdobeStock_60533635-1024x683.jpeg\" alt=\"\" srcset=\"https:\/\/mango-projects.co.uk\/wp-content\/uploads\/2020\/05\/AdobeStock_60533635-1024x683.jpeg 1024w, https:\/\/mango-projects.co.uk\/wp-content\/uploads\/2020\/05\/AdobeStock_60533635-300x200.jpeg 300w, https:\/\/mango-projects.co.uk\/wp-content\/uploads\/2020\/05\/AdobeStock_60533635-768x512.jpeg 768w, https:\/\/mango-projects.co.uk\/wp-content\/uploads\/2020\/05\/AdobeStock_60533635-1536x1024.jpeg 1536w, https:\/\/mango-projects.co.uk\/wp-content\/uploads\/2020\/05\/AdobeStock_60533635-2048x1365.jpeg 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<!-- \/wp:image --><!-- wp:paragraph -->\n<p>To meet Passivhaus standard we use software called the Passivhaus Planning Package (PHPP) to enter data specific to the project in question, \u00a0such as U-values of walls, cold bridging detail and solar gain.\u00a0 Our own PHPP expert, working with our structural designers, can then model the design and give a figure for the energy demand. If this figure is too high to meet the standard, then various scenarios will be suggested to alter the design which would bring it to the standard \u2013 for clients wishing for a certified building.\u00a0<\/p>\n<!-- \/wp:paragraph --><!-- wp:paragraph -->\n<p>Formally the principle is defined as the total energy demand for space heating and cooling must be less than 15kWh\/m2\/yr of treated floor area. A standard house uses around 110kWh\/m2\/yr. As well as this, the total primary energy use for all appliances, domestic hot water and space heating and cooling is less than 120 kWh\/m2\/yr.<\/p>\n<!-- \/wp:paragraph --><!-- wp:heading {\"level\":4} -->\n<h4>The ways in which the passivhaus principle minimises heat loss<\/h4>\n<!-- \/wp:heading --><!-- wp:list -->\n<ul>\n<li>\u00a0Super air-tight envelope (&lt;0.6 ach &#8211; we typically achieve 0.3 ach)<\/li>\n<li>Minimal cold bridging in the external frame<\/li>\n<li>Controlled internal air quality by mechanical ventilation system<\/li>\n<li>Clever design of solar gain and summer shading to maximise winter heat gain from the sun.<\/li>\n<li>Use of low energy household appliances and lighting<\/li>\n<\/ul>\n<!-- \/wp:list --><!-- wp:image {\"id\":170,\"sizeSlug\":\"large\"} -->\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"606\" height=\"405\" class=\"wp-image-170\" src=\"https:\/\/mango-projects.co.uk\/wp-content\/uploads\/2020\/06\/ben_elle_ribbans.png\" alt=\"\" srcset=\"https:\/\/mango-projects.co.uk\/wp-content\/uploads\/2020\/06\/ben_elle_ribbans.png 606w, https:\/\/mango-projects.co.uk\/wp-content\/uploads\/2020\/06\/ben_elle_ribbans-300x200.png 300w\" sizes=\"(max-width: 606px) 100vw, 606px\" \/>\n<figcaption>Of the very small number of homes built in the UK that have achieved formal\u00a0Passivhaus + certification, our own\u00a0<a href=\"https:\/\/www.touchwoodhomes.co.uk\/?p=161\">Weyhill project\u00a0in<\/a>\u00a0Hampshire is among them!<\/figcaption>\n<\/figure>\n<!-- \/wp:image --><!-- wp:heading {\"level\":4} -->\n<h4>In 2015 the Passivhaus institute introduced two further levels of passivhaus certification for build efficiency:<\/h4>\n<!-- \/wp:heading --><!-- wp:paragraph -->\n<p><strong>A Passivhaus plus\u00a0<\/strong>home (PH+)\u00a0must not require more than 45 kWh \/ (m\u00b2a) of renewable primary energy.\u00a0In addition, it must generate at least 60 kWh \/ (m\u00b2a) of energy, based on the surface area,\u00a0and<strong>\u00a0Passivhaus premium<\/strong>\u00a0where by the energy requirement is further limited to 30 kWh \/ (m\u00b2a), the energy generation must be at least 120 kWh \/ (m\u00b2a).\u00a0<\/p>\n<!-- \/wp:paragraph -->\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-60a2560 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"60a2560\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-63bc76a\" data-id=\"63bc76a\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap 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The passivhaus standard sets out a way to reduce energy use for space heating and cooling by 90% compared to a traditional build house. To meet Passivhaus standard we use software called the Passivhaus [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"inline_featured_image":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/mango-projects.co.uk\/wp-json\/wp\/v2\/pages\/335"}],"collection":[{"href":"https:\/\/mango-projects.co.uk\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/mango-projects.co.uk\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/mango-projects.co.uk\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mango-projects.co.uk\/wp-json\/wp\/v2\/comments?post=335"}],"version-history":[{"count":0,"href":"https:\/\/mango-projects.co.uk\/wp-json\/wp\/v2\/pages\/335\/revisions"}],"wp:attachment":[{"href":"https:\/\/mango-projects.co.uk\/wp-json\/wp\/v2\/media?parent=335"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}