{"id":7624,"date":"2022-10-07T10:56:49","date_gmt":"2022-10-07T08:56:49","guid":{"rendered":"https:\/\/era.archi\/?p=7624"},"modified":"2024-11-07T14:03:51","modified_gmt":"2024-11-07T13:03:51","slug":"why-have-energy-recovery-ventilation-in-a-positive-house","status":"publish","type":"post","link":"https:\/\/era.archi\/en\/why-have-energy-recovery-ventilation-in-a-positive-house\/","title":{"rendered":"Why have energy recovery ventilation in a positive house?"},"content":{"rendered":"<p class=\"entry-title fusion-post-title fusion-responsive-typography-calculated\" data-fontsize=\"18\" data-lineheight=\"27px\">Why have energy recovery ventilation in a positive house?<\/p>\n<div class=\"post-content\">\n<p>How to recover heat from inside your positive house?<\/p>\n<h2>The air you breathe<\/h2>\n<p>Did you know that the the 3 most polluted Spanish cities are Catalan? And none of them is Barcelona, \u200b\u200bhowever they all are in the metropolitan area.<br \/>\nThe top 3 of the most polluted cities in Spain in 2023 is led by Mollet del Vall\u00e9s followed by Santa Perpetua de Mogoda and Granollers.<br \/>\nIn this ranking for 2023, we also find the following cities in these positions:<\/p>\n<ul>\n<li>26 Barcelona<\/li>\n<li>86 Madrid<\/li>\n<li>100 Palma de Mallorca<\/li>\n<li>103 Valencia<\/li>\n<\/ul>\n<p>Did you expect these results? Well, neither did I (source <a href=\"https:\/\/www.iqair.com\/world-most-polluted-cities?continent=59af92ac3e70001c1bd78e52&amp;country=qQfkagtcDQxqsukSY&amp;state=&amp;sort=-rank&amp;page=1&amp;perPage=50&amp;cities=\" target=\"_blank\" rel=\"noopener\">Qair<\/a>).<\/p>\n<p>And since we&#8217;re talking about me, let\u2019s have a quick introduction&#8211;&gt; May you don\u2019t know us yet, we are ERA architects.<br \/>\nActually, I&#8217;m Esther Rovira, architect and passive house designer in Barcelona and Mallorca for either passive houses, efficient houses and positive houses.<br \/>\nIn this post\u00a0<em>\u2018Why have energy recovery ventilation in a positive house\u2019?<\/em>, you will find our professional recommendation for breathing filtered and renewed air inside your home to avoid humidity, allergies and pollution in your city.<br \/>\nI hope it helps you!<br \/>\nLet&#8217;s go!<\/p>\n<\/div>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Positive houses and passive houses use energy recovery ventilation systems for two main reasons:<\/span><\/p>\n<h2><strong>REASON 1) To renovate the air<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">First, in order to secure the air renovation inside.<br \/>\n<\/span><span style=\"font-weight: 400;\">Which means that the air inside has CO2 levels lower than 1.000 ppm (parts of carbon dioxide in one million parts of air).<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Fun Fact: <\/span><span style=\"font-weight: 400;\">To give you an idea, the CO2 particles in a forest are lower than 300ppm during the day.<br \/>\nIn a school classroom of 30m2 with no ventilation and 25 teenagers inside (with their active hormones); will be easily above 1.500ppm within the first 10 minutes of class.<\/span><\/p>\n<h2><strong>REASON 2) To recover heat<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Second, to recover the heat inside during winter with a double vent tube system.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">On the side, there is a set of ventilation tubes taking out the foul air inside.<br \/>\nThese tubes take away the air from the kitchen and bathrooms since it\u2019s where the air is getting wet and smelly.<br \/>\n<\/span><span style=\"font-weight: 400;\">So this unhealthy, used air also happens to be at the inside temperature (20\u00ba-25\u00baC). Then, during winter, this temperature is recovered to heat the fresh air that comes from outside without mixing them to each other.<br \/>\n<\/span><span style=\"font-weight: 400;\">So, on the other side, before pushing fresh air into the rest of the rooms, the outside air goes into a heat exchanger box. This box puts the different air flows into small tunnels in a specific order.<br \/>\n<\/span><span style=\"font-weight: 400;\">That order forces the different airs to be neighbors on the other side of the tunnel.<br \/>\n<\/span><span style=\"font-weight: 400;\">Then the fresh air from outside (at 10\u00ba) is the neighbor of the air at 20-25\u00baC.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">Since the only thing dividing these neighbors is a thin aluminum wall, and aluminum has a very high thermal conductivity value. Then the airs exchange their temperatures.<br \/>\n<\/span><span style=\"font-weight: 400;\">This causes the fresh air to get almost the inside temperature even before it&#8217;s been pushed into the living room and bedrooms.\u00a0\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The magic of this system is that it uses the inertia of the heat inside to create more heat. Resulting to be a very efficient system running at a very low energy during winter.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p>You may be asking yourself:<\/p>\n<h2><strong>What about when it\u2019s -15\u00ba outside?<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">You&#8217;re right!, then you may preheat the air before it\u2019s being pushed into the bedrooms.<br \/>\n<\/span><span style=\"font-weight: 400;\">However these systems are like an electrical toaster and consume lots of energy.<br \/>\n<\/span><span style=\"font-weight: 400;\">So, we usually use other systems that are more efficient to heat the air inside and give that difference of temperature we need.<br \/>\nUsually an efficient heat pump for the cooler days.<\/span><\/p>\n<h2><strong>How about summer?<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">This system has a bypass during summer not to pre-heat the air.<br \/>\n<\/span><span style=\"font-weight: 400;\">Meaning it takes a detour to go around the box exchanger, so the air comes at an outside temperature directly.<\/span><\/p>\n<h2><strong>What if the outside temperature is 35\u00baC?<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Then, there are other systems to pre-cool the air before it\u2019s pushed into the rooms. <\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">However it forces you to insulate the fresh ventilation tubes to avoid water condensation.<br \/>\n<\/span><span style=\"font-weight: 400;\">And if you have 35\u00baC outside, the passive simulator will force you to have a cooling system apart from the ventilation system.<br \/>\nSo, considering there are more efficient systems to cool the air, why spend money and energy insulating the pushing in ventilation tubes?<\/span><\/p>\n<p>&nbsp;<\/p>\n<h2><strong>Our professional recommendation:<\/strong><\/h2>\n<p>Energy recovery ventilation system work best if you have an airtight house.<br \/>\nAirtightness is better achieved in CLT wood houses.<\/p>\n<p><strong>You may also be interested in:<br \/>\n<\/strong>Our other posts:<br \/>\n<strong><em>&#8211; <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/era.archi\/en\/airtightness-in-the-passive-house\/\" target=\"_blank\" rel=\"noopener\">Airtighness in a passive house<\/a><\/span><br \/>\n&#8211; <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/era.archi\/en\/clt-wooden-house\/\" target=\"_blank\" rel=\"noopener\">CLT wood house price<\/a><\/span><\/em><\/strong><\/p>\n<p>&nbsp;<\/p>\n<p>Hope this post <em>&#8216;Why have energy recovery ventilation in a positive house?&#8217;<\/em> is helpful!<\/p>\n<p>Best of luck on this adventure.<br \/>\nSee you on the next post,<\/p>\n<p>&nbsp;<\/p>\n<div><strong><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"https:\/\/www.linkedin.com\/in\/estherrovira\/\" rel=\"noopener noreferrer\">Esther Rovira Raurell<\/a><\/span><\/strong><\/div>\n<div><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"https:\/\/era.archi\/estudio\/\">Architect in Barcelona<\/a>\u00a0#<a style=\"color: #000000;\" href=\"https:\/\/www.arquitectes.cat\/\" rel=\"noopener noreferrer\">COAC 44234-8<\/a><\/span><\/div>\n<div><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"https:\/\/www.passivhausplaner.eu\/index.php?lang=en-GB\" rel=\"noopener noreferrer\">Passive House Designer<\/a><\/span><\/div>\n<div><span style=\"color: #000000;\">Affiliated to the\u00a0<a style=\"color: #000000;\" href=\"https:\/\/passivehouse-international.org\/memberSearchDetails.php?member_id=9577\" rel=\"noopener noreferrer\">International Passive House Association<\/a><\/span><\/div>\n<div><span style=\"color: #000000;\">Founder of\u00a0<a style=\"color: #000000;\" href=\"https:\/\/era.archi\/es\" rel=\"noopener noreferrer\">ERA architects<\/a>\u00a0<\/span><\/div>\n<div><\/div>\n<p>P.S. Wanna get FREE tips for your project weekly?<strong>\u00a0<span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/mailchi.mp\/70756c2ddba1\/barcelona-green-architect-tips\" target=\"_blank\" rel=\"noopener\">Yas!<\/a><\/span>\u00a0<\/strong>or follow us\u00a0on<span style=\"color: #000000;\">\u00a0<a style=\"color: #000000;\" href=\"https:\/\/www.instagram.com\/era.archi\/\" target=\"_blank\" rel=\"noopener noreferrer\">Instagram<\/a>,\u00a0<a style=\"color: #000000;\" href=\"https:\/\/pin.it\/3Du3dBr\" target=\"_blank\" rel=\"noopener\">Pinterest<\/a>,\u00a0<a style=\"color: #000000;\" href=\"https:\/\/twitter.com\/ERAarchi\" target=\"_blank\" rel=\"noopener noreferrer\">Twitter<\/a>\u00a0y\u00a0<a style=\"color: #000000;\" href=\"https:\/\/www.facebook.com\/ERAarchis\/\" target=\"_blank\" rel=\"noopener noreferrer\">Facebook<\/a><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Why have energy recovery ventilation in a positive house? How [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":7939,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[355,138,629,664,142,868,630,628,165],"class_list":["post-7624","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","tag-architect-barcelona","tag-architect-passive-house-barcelona","tag-clt-house","tag-energy-recovery-ventilation","tag-english-speaking-architect-barcelona","tag-passive-house-en-3","tag-passive-house-barcelona","tag-positive-house","tag-wood-house"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Why have energy recovery ventilation in a positive house? - ERA architects<\/title>\n<meta name=\"description\" content=\"In&#039; Why have energy recovery ventilation in a positive house?&#039; I give you 2 reasons 3 answers for energy recovery ventilation in your house\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/era.archi\/en\/why-have-energy-recovery-ventilation-in-a-positive-house\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Why have energy recovery ventilation in a positive house? - ERA architects\" \/>\n<meta property=\"og:description\" content=\"In&#039; Why have energy recovery ventilation in a positive house?&#039; I give you 2 reasons 3 answers for energy recovery ventilation in your house\" \/>\n<meta property=\"og:url\" content=\"https:\/\/era.archi\/en\/why-have-energy-recovery-ventilation-in-a-positive-house\/\" \/>\n<meta property=\"og:site_name\" content=\"ERA architects\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/ERAarchis\" \/>\n<meta property=\"article:published_time\" content=\"2022-10-07T08:56:49+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-11-07T13:03:51+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/era.archi\/wp-content\/uploads\/2022\/10\/Why-have-energy-recovery-ventilation-in-a-positive-house.-1.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1290\" \/>\n\t<meta property=\"og:image:height\" content=\"430\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"ERA\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@ERAarchi\" \/>\n<meta name=\"twitter:site\" content=\"@ERAarchi\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"ERA\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/era.archi\/en\/why-have-energy-recovery-ventilation-in-a-positive-house\/\",\"url\":\"https:\/\/era.archi\/en\/why-have-energy-recovery-ventilation-in-a-positive-house\/\",\"name\":\"Why have energy recovery ventilation in a positive house? - ERA architects\",\"isPartOf\":{\"@id\":\"https:\/\/era.archi\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/era.archi\/en\/why-have-energy-recovery-ventilation-in-a-positive-house\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/era.archi\/en\/why-have-energy-recovery-ventilation-in-a-positive-house\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/era.archi\/wp-content\/uploads\/2022\/10\/Why-have-energy-recovery-ventilation-in-a-positive-house.-1.jpg\",\"datePublished\":\"2022-10-07T08:56:49+00:00\",\"dateModified\":\"2024-11-07T13:03:51+00:00\",\"author\":{\"@id\":\"https:\/\/era.archi\/#\/schema\/person\/eabaeddf58e0d5ac5fc021e7fbcf207e\"},\"description\":\"In' Why have energy recovery ventilation in a positive house?' 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