{"id":799,"date":"2014-01-21T16:28:22","date_gmt":"2014-01-21T14:28:22","guid":{"rendered":"http:\/\/cadredidactice.ub.ro\/gavrilalucian\/?p=799"},"modified":"2014-01-21T16:28:22","modified_gmt":"2014-01-21T14:28:22","slug":"examen-operatii-unitare-1-gr-1031","status":"publish","type":"post","link":"https:\/\/cadredidactice.ub.ro\/gavrilalucian\/2014\/01\/21\/examen-operatii-unitare-1-gr-1031\/","title":{"rendered":"Examen Operatii Unitare 1 gr. 1031"},"content":{"rendered":"<ol start=\"1\">\n<li>Dac\u0103 era\u0163i mai aten\u0163i, v-a\u0163i fi dat seama c\u0103 bilan\u0163ul termic al condensatorului de suprafa\u0163\u0103 (cerut la examen) este pu\u0163in diferit fa\u0163\u0103 de cel al condensatorului de amestec (f\u0103cut la clas\u0103).<\/li>\n<li>La instala\u0163iile de evaporare cu efect multiplu cu circula\u0163ie \u00een echicurent lichidul trece dintr-un corp \u00een altul datorit\u0103 diferen\u0163elor de presiune; nu este necesar\u0103 o pomp\u0103 pentru transvazarea sa.<\/li>\n<li>\u00cen condensatorul de suprafa\u0163\u0103 aburul condenseaz\u0103 la T constant (80\u00b0C), iar apa de r\u0103cire se \u00eenc\u0103lze\u015fte de la Ti = 20\u00b0C la Tf = 40\u00b0C. Ca urmare, diferen\u0163a medie de temperatur\u0103 (aceea\u015fi \u015fi la circula\u0163ie \u00een echicurent \u015fi la circula\u0163ie \u00een contracurent) este:<\/li>\n<\/ol>\n<p>\u0394Tm = [(Tc \u2013 Tf) \u2013 (Tc \u2013 Ti)]\/ln[(Tc \u2013 Tf)\/(Tc \u2013 Ti)] = [(80 \u2013 40) \u2013 (80 \u2013 20)\/ln[(80 \u2013 40)\/(80 \u2013 20)] = (40 \u2013 60)\/ln(40\/60) = -20\/ln 0,66 = -20\/-0,4 = 49,3 K<\/p>\n<p>Cam asta ar fi trebuit s\u0103 face\u0163i la punctele 4, 5 \u015fi 6. La punctele 1 \u2013 3 v-a\u0163i descurcat onorabil marea majoritate.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Dac\u0103 era\u0163i mai aten\u0163i, v-a\u0163i fi dat seama c\u0103 bilan\u0163ul termic al condensatorului de suprafa\u0163\u0103 (cerut la examen) este pu\u0163in diferit fa\u0163\u0103 de cel al condensatorului de amestec (f\u0103cut la clas\u0103). La instala\u0163iile de evaporare cu efect multiplu cu circula\u0163ie \u00een echicurent lichidul trece dintr-un corp \u00een altul datorit\u0103 diferen\u0163elor de presiune; nu este necesar\u0103 &hellip; <a href=\"https:\/\/cadredidactice.ub.ro\/gavrilalucian\/2014\/01\/21\/examen-operatii-unitare-1-gr-1031\/\" class=\"more-link\">Continu\u0103 lectura <span class=\"screen-reader-text\">Examen Operatii Unitare 1 gr. 1031<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":271,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"gallery","meta":{"footnotes":""},"categories":[103],"tags":[],"class_list":["post-799","post","type-post","status-publish","format-gallery","hentry","category-actualizari","post_format-post-format-gallery"],"views":611,"_links":{"self":[{"href":"https:\/\/cadredidactice.ub.ro\/gavrilalucian\/wp-json\/wp\/v2\/posts\/799","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cadredidactice.ub.ro\/gavrilalucian\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cadredidactice.ub.ro\/gavrilalucian\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cadredidactice.ub.ro\/gavrilalucian\/wp-json\/wp\/v2\/users\/271"}],"replies":[{"embeddable":true,"href":"https:\/\/cadredidactice.ub.ro\/gavrilalucian\/wp-json\/wp\/v2\/comments?post=799"}],"version-history":[{"count":0,"href":"https:\/\/cadredidactice.ub.ro\/gavrilalucian\/wp-json\/wp\/v2\/posts\/799\/revisions"}],"wp:attachment":[{"href":"https:\/\/cadredidactice.ub.ro\/gavrilalucian\/wp-json\/wp\/v2\/media?parent=799"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cadredidactice.ub.ro\/gavrilalucian\/wp-json\/wp\/v2\/categories?post=799"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cadredidactice.ub.ro\/gavrilalucian\/wp-json\/wp\/v2\/tags?post=799"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}