{"id":4669,"date":"2021-06-05T15:44:31","date_gmt":"2021-06-05T13:44:31","guid":{"rendered":"https:\/\/horti-generation.com\/?p=4669"},"modified":"2026-03-28T23:32:04","modified_gmt":"2026-03-28T22:32:04","slug":"comment-lire-un-diagramme-psychrometrique","status":"publish","type":"post","link":"https:\/\/horti-generation.com\/fr\/comment-lire-un-diagramme-psychrometrique\/","title":{"rendered":"Humidit\u00e9 de l&#8217;air &#8211; Comment lire un diagramme psychrom\u00e9trique ?"},"content":{"rendered":"\n<p><span style=\"box-sizing: border-box; margin: 0px; padding: 0px;\">Le \u00ab\u00a0<strong>diagramme psychrom\u00e9trique<\/strong>\u00a0\u00bb de l&#8217;air humide est un outil qui facilit<\/span>e la repr\u00e9sentation des transformations de l&#8217;air. Cet outil repr\u00e9sente, sur un graphique, les principales caract\u00e9ristiques physiques et thermodynamiques de l&#8217;air humide.<\/p>\n\n\n\n<p><span style=\"box-sizing: border-box; margin: 0px; padding: 0px;\">Pour une\u00a0<strong>pression atmosph\u00e9rique P donn\u00e9e<\/strong>, le diagramme psychrom\u00e9trique permet de lire toutes les caract\u00e9ristiques utilis\u00e9es dans une \u00e9tude du traitement de l&#8217;air.<\/span><\/p>\n\n\n\n<p>Dans une serre commerciale, la gestion de l&#8217;humidit\u00e9 de l&#8217;air est l&#8217;un des leviers les plus importants pour pr\u00e9venir les maladies fongiques, optimiser la photosynth\u00e8se et maintenir la qualit\u00e9 des cultures. Le diagramme psychrom\u00e9trique est l&#8217;outil de r\u00e9f\u00e9rence pour comprendre et ma\u00eetriser ces param\u00e8tres climatiques.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2><strong>Explications rapides<\/strong><\/h2>\n\n\n\n<p><\/p>\n\n\n\n<p>Voici une m\u00e9thodologie simplifi\u00e9e pour le lire :<\/p>\n\n\n\n<p><\/p>\n\n\n\n<ul>\n<li>L&#8217;<strong>axe des temp\u00e9ratures<\/strong> (abscisse &#8211; axe horizontal) indique la <strong>temp\u00e9rature s\u00e8che<\/strong> de l&#8217;air . Gradu\u00e9e de -15\u00b0C \u00e0 55\u00b0C.<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n\n\n\n<ul>\n<li>L&#8217;<strong>axe de l&#8217;humidit\u00e9 absolue<\/strong> (ordonn\u00e9e &#8211; axe vertical) ou la <strong>teneur en humidit\u00e9<\/strong> indique la teneur en humidit\u00e9 de l&#8217;air. C&#8217;est la quantit\u00e9 de vapeur pr\u00e9sente dans 1 kilogramme d&#8217;air sec. Il est exprim\u00e9 en grammes de vapeur d&#8217;eau par kilogramme d&#8217;air sec et il est not\u00e9 &#8220;r&#8221; [g vapeur\/kg air sec] (en abr\u00e9g\u00e9 : g\/kg. Gradu\u00e9 de 0g\/kg \u00e0 30g\/kg)<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n\n\n\n<ul>\n<li>La <strong>saturation de l&#8217;air en vapeur d&#8217;eau<\/strong> limite la courbe du graphique de gauche. Correspond \u00e0 la quantit\u00e9 maximale de vapeur d&#8217;eau que l&#8217;air peut contenir sans se condenser. En effet, lorsque l&#8217;air contient cette quantit\u00e9 de vapeur, il est satur\u00e9 d&#8217;humidit\u00e9 (hygrom\u00e9trie = 100%).<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n\n\n\n<blockquote class=\"wp-block-quote\">\n<p>\u00ab Le <strong>concept de base <\/strong>est qu&#8217;il existe une relation entre la temp\u00e9rature et l&#8217;humidit\u00e9 de saturation. La teneur en vapeur saturante augmente fortement avec la temp\u00e9rature de l&#8217;air. <strong>L&#8217;air chaud est capable de retenir beaucoup de vapeur d&#8217;eau.<\/strong> \u00bb<\/p>\n<\/blockquote>\n\n\n\n<p><\/p>\n\n\n\n<h3>&#8211; <strong>Relative Humidity (RH %<\/strong>)<\/h3>\n\n\n\n<p><\/p>\n\n\n\n<p>L&#8217;<strong>humidit\u00e9 relative<\/strong> RH (ou hygrom\u00e9trie) repr\u00e9sente pour une temp\u00e9rature donn\u00e9e le rapport entre l&#8217;humidit\u00e9 absolue de l&#8217;air \u00e9tudi\u00e9 et l&#8217;humidit\u00e9 maximale qu&#8217;il pourrait atteindre s&#8217;il \u00e9tait satur\u00e9 en vapeur (humidit\u00e9 de saturation absolue).<\/p>\n\n\n\n<p>L&#8217;HR est not\u00e9e <strong>\u03c6<\/strong> et est exprim\u00e9e en pourcentage. Une hygrom\u00e9trie de 100 % correspond \u00e0 la saturation. Si on divise la teneur en vapeur d&#8217;eau par deux, l&#8217;air est sur une droite \u00e0 moiti\u00e9 satur\u00e9e, c&#8217;est-\u00e0-dire \u00e0 <strong>Hr = 50%<\/strong> (on peut aussi \u00e9crire : \u03d5 = 50%)<\/p>\n\n\n\n<p><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/horti-generation.com\/wp-content\/uploads\/2020\/12\/image.png\" alt=\"Diagramme psychrom\u00e9trique en horticulture\" class=\"wp-image-3658\" width=\"568\" height=\"396\" srcset=\"https:\/\/horti-generation.com\/wp-content\/uploads\/2020\/12\/image.png 442w, https:\/\/horti-generation.com\/wp-content\/uploads\/2020\/12\/image-300x209.png 300w\" sizes=\"(max-width: 568px) 100vw, 568px\" \/><\/figure><\/div>\n\n\n<p><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/horti-generation.com\/wp-content\/uploads\/2020\/12\/image-1.png\" alt=\"Diagramme psychrom\u00e9trique \u00e9tude du point de ros\u00e9e et saturation en humidit\u00e9 \" class=\"wp-image-3661\" width=\"549\" height=\"368\" srcset=\"https:\/\/horti-generation.com\/wp-content\/uploads\/2020\/12\/image-1.png 605w, https:\/\/horti-generation.com\/wp-content\/uploads\/2020\/12\/image-1-300x201.png 300w\" sizes=\"(max-width: 549px) 100vw, 549px\" \/><\/figure><\/div>\n\n\n<p><\/p>\n\n\n\n<p>.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h3><strong>\u2013 Temp\u00e9rature de ros\u00e9e, temp\u00e9rature humide et temp\u00e9rature s\u00e8che<\/strong><\/h3>\n\n\n\n<p><\/p>\n\n\n\n<h4><strong><span class=\"has-inline-color has-thr-acc-color\">Temp\u00e9rature du point de ros\u00e9e en \u00b0C<\/span><\/strong><\/h4>\n\n\n\n<p><\/p>\n\n\n\n<p>C&#8217;est la temp\u00e9rature \u00e0 laquelle la vapeur d&#8217;eau dans l&#8217;<strong>air commence \u00e0 se condenser lorsque l&#8217;air se refroidit<\/strong>. En d&#8217;autres termes, c&#8217;est la temp\u00e9rature (pour un taux d&#8217;humidit\u00e9 donn\u00e9 : w) \u00e0 laquelle la vapeur atteint la pression de vapeur saturante.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/horti-generation.com\/wp-content\/uploads\/2020\/12\/image-4.png\" alt=\"Dew temperature to control in your greenhouse\" class=\"wp-image-3670\" width=\"552\" height=\"378\" srcset=\"https:\/\/horti-generation.com\/wp-content\/uploads\/2020\/12\/image-4.png 606w, https:\/\/horti-generation.com\/wp-content\/uploads\/2020\/12\/image-4-300x205.png 300w\" sizes=\"(max-width: 552px) 100vw, 552px\" \/><\/figure><\/div>\n\n\n<p><\/p>\n\n\n\n<h4><strong><span class=\"has-inline-color has-thr-acc-color\">Temp\u00e9rature du bulbe humide en \u00b0C<\/span><\/strong><\/h4>\n\n\n\n<p><\/p>\n\n\n\n<p>La <strong>temp\u00e9rature de bulbe humide<\/strong> th est la temp\u00e9rature lue sur un thermom\u00e8tre (appel\u00e9 thermom\u00e8tre psychrom\u00e9trique) dont le bulbe est recouvert de coton satur\u00e9 d&#8217;eau et plac\u00e9 dans un flux d&#8217;air.<\/p>\n\n\n\n<p>En effet, l&#8217;air en contact avec le bulbe produit une<strong> \u00e9vaporation<\/strong> qui fait baisser la temp\u00e9rature du bulbe, qui se stabilise lorsque l&#8217;air devient satur\u00e9.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/horti-generation.com\/wp-content\/uploads\/2020\/12\/image-6.png\" alt=\"Wet bulb temperature \" class=\"wp-image-3676\" width=\"532\" height=\"366\" srcset=\"https:\/\/horti-generation.com\/wp-content\/uploads\/2020\/12\/image-6.png 604w, https:\/\/horti-generation.com\/wp-content\/uploads\/2020\/12\/image-6-300x207.png 300w\" sizes=\"(max-width: 532px) 100vw, 532px\" \/><\/figure><\/div>\n\n\n<p><\/p>\n\n\n\n<h4><strong><span class=\"has-inline-color has-thr-acc-color\">Temp\u00e9rature de bulbe sec en \u00b0C<\/span><\/strong><\/h4>\n\n\n\n<p><\/p>\n\n\n\n<p>La <strong>temp\u00e9rature s\u00e9che de l&#8217;air<\/strong> ts est la temp\u00e9rature relev\u00e9e et lue sur un thermom\u00e8tre plac\u00e9 dans un courant d&#8217;air, \u00e0 l&#8217;abri de tout rayonnement.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/horti-generation.com\/wp-content\/uploads\/2020\/12\/image-3.png\" alt=\"temp\u00e9rature s\u00e8che Diagramme psychrom\u00e9trique \" class=\"wp-image-3667\" width=\"491\" height=\"339\" srcset=\"https:\/\/horti-generation.com\/wp-content\/uploads\/2020\/12\/image-3.png 567w, https:\/\/horti-generation.com\/wp-content\/uploads\/2020\/12\/image-3-300x207.png 300w\" sizes=\"(max-width: 491px) 100vw, 491px\" \/><\/figure><\/div>\n\n\n<p><\/p>\n\n\n\n<p>Pour conclure, d&#8217;autres <strong>caract\u00e9ristiques physiques de l&#8217;air <\/strong>peuvent \u00eatre analys\u00e9es et doivent \u00eatre prises en compte dans le diagramme psychrom\u00e9trique.<\/p>\n\n\n\n<p><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/www.abcclim.net\/images\/stories\/imagesite\/diagramme%20psychrometrique.jpg\" alt=\"Le diagramme psychrom\u00e9trique c'est quoi ?\" width=\"546\" height=\"483\"\/><figcaption class=\"wp-element-caption\">Source : ABC Clim (<em><a href=\"https:\/\/www.abcclim.net\/le-diagramme-carrier.html\" target=\"_blank\" rel=\"noreferrer noopener\">lien<\/a><\/em>)<\/figcaption><\/figure><\/div>\n\n\n<p><\/p>\n\n\n\n<p>Sources :<\/p>\n\n\n\n<p>Diagramme psychrom\u00e9trique : <a href=\"https:\/\/abitor2.files.wordpress.com\/2013\/11\/diagramme_20psychrom_c3_a9trique_201-3.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/abitor2.files.wordpress.com\/2013\/11\/diagramme_20psychrom_c3_a9trique_201-3.pdf<\/a><\/p>\n\n\n\n<p>Psychrometric Chart Use (en anglais) : <a href=\"https:\/\/extension.psu.edu\/psychrometric-chart-use\">https:\/\/extension.psu.edu\/psychrometric-chart-use<\/a><\/p>\n\n\n\n<p>The Psychrometric chart and greenhouse climate control (en anglais) : <a href=\"https:\/\/hortamericas.com\/wp-content\/uploads\/2016\/05\/JBWhitepaper.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/hortamericas.com\/wp-content\/uploads\/2016\/05\/JBWhitepaper.pdf<\/a> <\/p>\n\n\n\n<p><a href=\"https:\/\/www.sciencedirect.com\/topics\/engineering\/psychrometric-chart\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.sciencedirect.com\/topics\/engineering\/psychrometric-chart<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Le diagramme psychrom\u00e9trique est l&#8217;outil de r\u00e9f\u00e9rence pour comprendre et ma\u00eetriser l&#8217;humidit\u00e9 de l&#8217;air dans une serre commerciale. Temp\u00e9rature s\u00e8che, humidit\u00e9 relative, point de ros\u00e9e, bulbe humide : ce guide vous explique comment lire et utiliser ce graphique pour pr\u00e9venir les maladies fongiques, optimiser la ventilation et am\u00e9liorer vos conditions de culture.<\/p>\n","protected":false},"author":2,"featured_media":3682,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0},"categories":[263,265],"tags":[609,602,606,603,604,605,610],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Humidit\u00e9 de l&#039;air - Comment lire un diagramme psychrom\u00e9trique ? - Horti Generation<\/title>\n<meta name=\"description\" content=\"Comment lire un diagramme psychrom\u00e9trique pour g\u00e9rer l&#039;humidit\u00e9, la temp\u00e9rature et le point de ros\u00e9e dans votre serre commerciale.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/horti-generation.com\/fr\/comment-lire-un-diagramme-psychrometrique\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Humidit\u00e9 de l&#039;air - Comment lire un diagramme psychrom\u00e9trique ? 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