{"id":4503,"date":"2021-06-05T15:51:57","date_gmt":"2021-06-05T12:51:57","guid":{"rendered":"http:\/\/vahamartti.fi\/blog\/?p=4503"},"modified":"2024-01-14T20:59:50","modified_gmt":"2024-01-14T17:59:50","slug":"veden-lammittamiseen-tarvittava-teho","status":"publish","type":"post","link":"http:\/\/vahamartti.fi\/blog\/?p=4503","title":{"rendered":"Veden l\u00e4mmitt\u00e4miseen tarvittava teho"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Hyv\u00e4 nyrkkis\u00e4\u00e4nt\u00f6 on, ett\u00e4 1000 litran l\u00e4mm\u00f6n nostaminen yhdell\u00e4 asteella kuluttaa energiaa 1kWh. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Energiam\u00e4\u00e4r\u00e4 saadaan laskettua kaavalla Q = c * m * \u0394t, jossa\u00a0Q on l\u00e4mp\u00f6m\u00e4\u00e4r\u00e4, <em>c<\/em>\u00a0on ominaisl\u00e4mp\u00f6kapasiteetti,\u00a0<em>m<\/em>\u00a0kappaleen massa ja\u00a0<em>\u0394t<\/em>\u00a0kappaleen l\u00e4mp\u00f6tilan muutos.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ominaisl\u00e4mp\u00f6kapasiteetti on riippuvainen kappaleesta, jota l\u00e4mmitet\u00e4\u00e4n. Vedell\u00e4 t\u00e4m\u00e4 arvo on 4,1876 kJ\/kg\u00b0C. Yksi litra vett\u00e4 painaa 1000g (4 \u00b0C l\u00e4mp\u00f6tilassa). <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1000 litran l\u00e4mmitt\u00e4miseen yhdell\u00e4 asteella tarvittava energiam\u00e4\u00e4r\u00e4 saadaan laskettua seuraavasti: 4,1876 kJ\/kg\u00b0C  * 1000 kg * 1\u00b0C = 4187,6 kJ. Kun saadun tuloksen jakaa 3600 sekunnilla (=1h), saadaan tehoksi 1,16 kW. Vastaava energiam\u00e4\u00e4r\u00e4 on 1,16 kWh.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Mutta, kuinka suurella teholla kylm\u00e4\u00e4 vett\u00e4 pit\u00e4\u00e4 l\u00e4mmitt\u00e4\u00e4, jotta hanasta tullessaan se on kuumaa?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Katselin kaukol\u00e4mm\u00f6n tehomittaria, ja ihmettelin todella suurta tehonkulutusta. Kokeilin laskea 10 litran \u00e4mp\u00e4rin t\u00e4yteen kuumaa vett\u00e4, ottoteho kasvoi suurimmillaan 50kW:ia. Ehdin jo ep\u00e4ill\u00e4 vikaa, sill\u00e4 eih\u00e4n veden l\u00e4mmitt\u00e4minen voi tuollaisia tehoja ottaa, vai voiko?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tarkat l\u00e4mp\u00f6tilat ja virtausm\u00e4\u00e4r\u00e4t eiv\u00e4t ole tiedossa, joten tein laskelman arvioiduilla luvuilla. K\u00e4ytt\u00e4m\u00e4ni arvioluvut ovat seuraavat: hanasta tulee 12 litraa \/ min, tuloveden l\u00e4mp\u00f6 8 \u00b0C ja l\u00e4htev\u00e4n 60 \u00b0C (=&gt; l\u00e4mp\u00f6tilaero 52 \u00b0C).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">N\u00e4ill\u00e4 arvoilla energiaa kuluu:  4,1876 kJ\/kg\u00b0C * 12 kg * 52 \u00b0C = 2613 kJ.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tulos saadaan muutettua l\u00e4mmitystehoksi jakamalla se ajalla, jolla ko. energiam\u00e4\u00e4r\u00e4 otetaan ulos: 2613 kJ \/ 60 s = 43,5 kW. Laskettu tulos on pienempi kuin tehomittarin n\u00e4ytt\u00e4m\u00e4, t\u00e4m\u00e4 selittyy v\u00e4\u00e4rist\u00e4 l\u00e4ht\u00f6arvoista, eli virtaus on voinut olla suurempi, tuloveden l\u00e4mp\u00f6 matalampi ja l\u00e4ht\u00f6veden l\u00e4mp\u00f6 suurempi.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Kukaan ei tietenk\u00e4\u00e4n laske tulikuumaa vett\u00e4 suihkussa p\u00e4\u00e4lleen. Esimerkin oli tarkoitus osoittaa, ett\u00e4 veden l\u00e4mmitt\u00e4minen todella vaatii suurta tehoa ja ett\u00e4 kaukol\u00e4mp\u00f6mittarissa n\u00e4kyv\u00e4t luvut pitiv\u00e4t todellakin paikkansa.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Hyv\u00e4 nyrkkis\u00e4\u00e4nt\u00f6 on, ett\u00e4 1000 litran l\u00e4mm\u00f6n nostaminen yhdell\u00e4 asteella kuluttaa energiaa 1kWh. Energiam\u00e4\u00e4r\u00e4 saadaan laskettua kaavalla Q = c * m * \u0394t, jossa\u00a0Q on l\u00e4mp\u00f6m\u00e4\u00e4r\u00e4, c\u00a0on ominaisl\u00e4mp\u00f6kapasiteetti,\u00a0m\u00a0kappaleen massa ja\u00a0\u0394t\u00a0kappaleen l\u00e4mp\u00f6tilan muutos. Ominaisl\u00e4mp\u00f6kapasiteetti on riippuvainen kappaleesta, jota l\u00e4mmitet\u00e4\u00e4n. Vedell\u00e4 t\u00e4m\u00e4 arvo on 4,1876 kJ\/kg\u00b0C. Yksi litra vett\u00e4 painaa 1000g (4 \u00b0C l\u00e4mp\u00f6tilassa). 1000 litran &hellip; <a href=\"http:\/\/vahamartti.fi\/blog\/?p=4503\" class=\"more-link\">Jatka lukemista <span class=\"screen-reader-text\">Veden l\u00e4mmitt\u00e4miseen tarvittava teho<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[1],"tags":[160,1085,162,1086],"class_list":["post-4503","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-energia","tag-lammittaminen","tag-teho","tag-vesi"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p1fteB-1aD","jetpack_sharing_enabled":true,"jetpack-related-posts":[],"_links":{"self":[{"href":"http:\/\/vahamartti.fi\/blog\/index.php?rest_route=\/wp\/v2\/posts\/4503","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/vahamartti.fi\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/vahamartti.fi\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/vahamartti.fi\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/vahamartti.fi\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4503"}],"version-history":[{"count":4,"href":"http:\/\/vahamartti.fi\/blog\/index.php?rest_route=\/wp\/v2\/posts\/4503\/revisions"}],"predecessor-version":[{"id":5069,"href":"http:\/\/vahamartti.fi\/blog\/index.php?rest_route=\/wp\/v2\/posts\/4503\/revisions\/5069"}],"wp:attachment":[{"href":"http:\/\/vahamartti.fi\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4503"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/vahamartti.fi\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4503"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/vahamartti.fi\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4503"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}