{"id":817,"date":"2024-04-21T23:04:28","date_gmt":"2024-04-21T21:04:28","guid":{"rendered":"https:\/\/invar.nl\/?p=817"},"modified":"2024-04-21T23:04:28","modified_gmt":"2024-04-21T21:04:28","slug":"ventilation-air-quality","status":"publish","type":"post","link":"https:\/\/invar.nl\/?p=817","title":{"rendered":"Ventilation &amp; air quality"},"content":{"rendered":"\n<p>I might need to ventilate more, but I would like to keep the heat in.<\/p>\n\n\n\n<p>Some ideas:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>CO<sub>2<\/sub> sensor &amp; humidity sensor to know when to ventilate. I must still have a breadboarded project somewhere based on <a href=\"https:\/\/operame.nl\/Operame\">Operame<\/a><\/li>\n\n\n\n<li>Automatic window opener, perhaps based on <a href=\"http:\/\/www.picbasic.nl\/frameload.htm?http:\/\/www.picbasic.nl\/raamopener.htm\">this<\/a> project?<\/li>\n\n\n\n<li>Heat recovery ventilation. The room I&#8217;d like to ventilate would require <a href=\"https:\/\/www.climaconstruct.be\/documents\/technische-info\/03-ventilatie-berekenen-van-lucht-debieten.pdf\">25-72 m\u00b3\/h<\/a>. Some ideas:\n<ul class=\"wp-block-list\">\n<li>Something like a used <a href=\"https:\/\/zehndernl.zendesk.com\/hc\/nl\/article_attachments\/115009949649\">Stork<\/a> <a href=\"https:\/\/www.marktplaats.nl\/q\/whr90\/#f:32|sortBy:PRICE|sortOrder:INCREASING\">WHR90<\/a> (\u20ac100) unit could work, but it&#8217;s very large. I could mount the outdoor inlet and exhaust on a panel behind the wooden folding &#8220;window&#8221; already in the room. Should probably duct one of the indoors connections of the unit to the other side of the room to prevent short circuiting.<\/li>\n\n\n\n<li>A smaller heat exchanger with separate fans would likely be sufficient, and would be much smaller and easier to mount. Also, perhaps can be quieter, especially if mounted in an<a href=\"https:\/\/www.cultureindoor.com\/nl-nl\/geluidwerende-behuizingen-voor-afzuigkappen\/3563-isobox-montagedoos-voor-luchtafzuiger-o125mm-3700688504476.html\"> insulated box<\/a>. However, it would likely be less efficient and probably more expensive.<\/li>\n\n\n\n<li>Something along the lines of <a href=\"https:\/\/www.youtube.com\/watch?v=FUhvuhItX30\">this<\/a> project or <a href=\"https:\/\/www.loudawson.com\/17884\/how-to-build-air-cross-flow-heat-exchanger\/\">this<\/a> one<\/li>\n\n\n\n<li>A heat recovery ventilation system using a single vent, with heat recovery material inside, blowing in\/out alternately. Sometimes called &#8220;recuperator ventilation&#8221;. Less efficient, but simplest solution. A new unit can be had for about \u20ac150 but should also be the easiest to DIY, because the core doesn&#8217;t have to exchange heat through space, only over time. Ventilation (in\/out) regime and thermal capacity should be matched carefully for highest efficiency, which means that throttling might not be possible. <a href=\"https:\/\/www.youtube.com\/watch?v=iT5zAw84s8o\">Commercial<\/a> <a href=\"https:\/\/www.youtube.com\/watch?v=sbsO8FbHUwU\">units<\/a> use a ceramic core and roughly 70+70 second cycles. I guess instead of throttling, I could control the amount of cycles it does per hour based on the ventilation requirement. And\/or use multiple temperature probes to control cycles? Ceramic cores are available: for instance <a href=\"https:\/\/www.aliexpress.com\/item\/1005006674115762.html\">this<\/a> hexagonal one, and I wonder if <a href=\"https:\/\/www.aliexpress.com\/item\/1005005980171917.html#nav-review\">this<\/a> ceramic catalytic converter core substrate is suitable but might clog up too fast.<\/li>\n\n\n\n<li>To keep in mind: outside-to-inside noise reduction by installing a noise filter on the vents? And or acoustic insulation on the wooden window to lower fan-to-outside noise?<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p>So far, the single fan &#8220;recuperator&#8221; seems the most viable option. Perhaps with a 12V case fan, and the whole thing encased in an insulated box mounted to the wooden window. And some filters. Or perhaps two units together in the box for a low\/high flow option. Can even set it to just blow into the room at night on very hot days.<\/p>\n\n\n\n<p>First, get a CO<sub>2<\/sub> sensor working.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I might need to ventilate more, but I would like to keep the heat in. Some ideas: So far, the single fan &#8220;recuperator&#8221; seems the most viable option. Perhaps with a 12V case fan, and the whole thing encased in an insulated box mounted to the wooden window. And some filters. Or perhaps two units [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,57],"tags":[],"class_list":["post-817","post","type-post","status-publish","format-standard","hentry","category-furniture","category-ventilation-air-quality"],"_links":{"self":[{"href":"https:\/\/invar.nl\/index.php?rest_route=\/wp\/v2\/posts\/817","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/invar.nl\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/invar.nl\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/invar.nl\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/invar.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=817"}],"version-history":[{"count":3,"href":"https:\/\/invar.nl\/index.php?rest_route=\/wp\/v2\/posts\/817\/revisions"}],"predecessor-version":[{"id":829,"href":"https:\/\/invar.nl\/index.php?rest_route=\/wp\/v2\/posts\/817\/revisions\/829"}],"wp:attachment":[{"href":"https:\/\/invar.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=817"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/invar.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=817"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/invar.nl\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=817"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}