{"id":2110,"date":"2026-10-14T20:35:55","date_gmt":"2026-10-14T19:35:55","guid":{"rendered":"https:\/\/wpcalc.com\/pt\/engenharia\/leis-de-afinidade-ventilador\/"},"modified":"2026-10-14T20:35:55","modified_gmt":"2026-10-14T19:35:55","slug":"leis-de-afinidade-ventilador","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/pt\/engenharia\/leis-de-afinidade-ventilador\/","title":{"rendered":"Leis de afinidade de ventiladores"},"content":{"rendered":"<section class=\"not-prose calculator-box\" aria-labelledby=\"calculator-title\"><div class=\"flex items-baseline sm:items-center justify-between gap-2 sm:gap-3\"><div class=\"flex flex-col sm:flex-row sm:items-center gap-2\"><span class=\"icon icon-calculator text-primary-700! text-base! dark:text-primary-300!\" aria-hidden=\"true\"><\/span><h2 id=\"calculator-title\" class=\"text-lg font-display font-bold\">Estime o desempenho do ventilador em uma nova velocidade<\/h2><\/div><div class=\"calcdash-favorite group\">\n  <button type=\"button\" class=\"favorite\" id=\"favorite\" data-favorite-id=\"2110\" data-favorite-title=\"Leis de afinidade de ventiladores\" data-favorite-url=\"https:\/\/wpcalc.com\/pt\/engenharia\/leis-de-afinidade-ventilador\/\" data-favorite-excerpt=\"Calcule a vaz\u00e3o, a press\u00e3o e a pot\u00eancia de um ventilador em uma nova rota\u00e7\u00e3o usando as leis de afinidade. Informe a rota\u00e7\u00e3o, a vaz\u00e3o, a press\u00e3o e a pot\u00eancia originais, al\u00e9m da nova rota\u00e7\u00e3o em rpm.\" aria-label=\"Adicionar aos favoritos\" data-favorite-icon=\"icon icon-ventilation\">\n    <span class=\"icon icon-shape-star-empty\" aria-hidden=\"true\"><\/span>\n  <\/button>\n  <div class=\"calcdash-favorite__tip\" aria-hidden=\"true\">\n   <span class=\"favorite-tooltip\" id=\"favorite-tooltip\"><\/span>\n  <\/div>\n  <span class=\"sr-only\" role=\"status\" id=\"favorite-status\"><\/span>\n<\/div><\/div><form action=\"https:\/\/wpcalc.com\/pt\/engenharia\/leis-de-afinidade-ventilador\/\" method=\"POST\" class=\"calculator\" id=\"calculator-2110\" data-post=\"2110\"><fieldset class=\"fieldset-input is-2\"><legend class=\"sr-only\">Campos de entrada<\/legend><div class=\"field has-term\" id=\"input-1\"><label for=\"field-1\">Velocidade original do ventilador (N\u2081)<\/label><div class=\"term\">N\u2081<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"velocidade_original_do_ventilador_n\" id=\"field-1\" aria-describedby=\"calc-unit-1\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" placeholder=\"Velocidade\" min=\"1\" value=\"1450\"\/><div class=\"unit\" id=\"calc-unit-1\">rpm<\/div><\/div><div class=\"field has-term\" id=\"input-2\"><label for=\"field-2\">Nova velocidade do ventilador (N\u2082)<\/label><div class=\"term\">N\u2082<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"nova_velocidade_do_ventilador_n\" id=\"field-2\" aria-describedby=\"calc-unit-2\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" placeholder=\"Velocidade\" min=\"1\" value=\"950\"\/><div class=\"unit\" id=\"calc-unit-2\">rpm<\/div><\/div><div class=\"field has-term\" id=\"input-3\"><label for=\"field-3\">Vaz\u00e3o de ar original (Q\u2081)<\/label><div class=\"term\">Q\u2081<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"text\" name=\"vazo_de_ar_original_q\" id=\"field-3\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" placeholder=\"Vaz\u00e3o\" min=\"0\" value=\"5000\"\/><div class=\"grid grid-cols-1\"><select id=\"field-4\" name=\"unidade\" aria-label=\"Unidade\"><option value=\"m3h\" selected>m\u00b3\/h<\/option><option value=\"cfm\">CFM<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><\/div><div class=\"field has-term\" id=\"input-4\"><label for=\"field-5\">Press\u00e3o original (P\u2081)<\/label><div class=\"term\">P\u2081<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"text\" name=\"presso_original_p\" id=\"field-5\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" placeholder=\"Press\u00e3o\" min=\"0\" value=\"300\"\/><div class=\"grid grid-cols-1\"><select id=\"field-6\" name=\"unidade\" aria-label=\"Unidade\"><option value=\"pa\" selected>Pa<\/option><option value=\"inh2o\">inH\u2082O<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><\/div><div class=\"field has-term\" id=\"input-5\"><label for=\"field-7\">Pot\u00eancia original (W\u2081)<\/label><div class=\"term\">W\u2081<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"text\" name=\"potncia_original_w\" id=\"field-7\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" placeholder=\"Pot\u00eancia\" min=\"0\" value=\"2.5\"\/><div class=\"grid grid-cols-1\"><select id=\"field-8\" name=\"unidade\" aria-label=\"Unidade\"><option value=\"kw\" selected>kW<\/option><option value=\"hp\">hp<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><\/div><div class=\"field is-checkbox is-single\" id=\"input-6\"><input type=\"checkbox\" id=\"field-9\" value=\"1\" checked=\"checked\"\/><label for=\"field-9\">Raz\u00e3o de velocidades (N\u2082 \/ N\u2081)<\/label><\/div><\/fieldset><div class=\"buttons\"><button type=\"submit\" data-text=\"Recalcular\" id=\"calculate-button\" data-post=\"2110\">Calcular<\/button><button type=\"reset\">Redefinir<\/button><\/div><div class=\"field is-checkbox hidden!\" id=\"field-auto-calc\"><input type=\"checkbox\" id=\"auto-calc\"><label for=\"auto-calc\">Calcular automaticamente<\/label><small>Se ativado, o resultado \u00e9 atualizado automaticamente quando voc\u00ea altera qualquer valor.<\/small><\/div><div class=\"fieldset-result is-hidden\" aria-labelledby=\"result-title\" aria-live=\"polite\" role=\"region\"> <h3 class=\"result-title bg-gradient-to-r from-primary-50 to-gray-50 dark:from-primary-900 dark:to-gray-800\" id=\"result-title\"><span class=\"icon icon-s-pulse\" aria-hidden=\"true\"><\/span> Desempenho estimado na nova velocidade<\/h3><div class=\"result-box\"><div class=\"field-result\" id=\"output-1\"><span class=\"field-title\"><span>Nova vaz\u00e3o de ar (Q\u2082)<\/span><span class=\"result-term\">Q\u2082<\/span><\/span><span class=\"field-value\" id=\"result-1\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-2\"><span class=\"field-title\"><span>Nova press\u00e3o (P\u2082)<\/span><span class=\"result-term\">P\u2082<\/span><\/span><span class=\"field-value\" id=\"result-2\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-3\"><span class=\"field-title\"><span>Nova pot\u00eancia (W\u2082)<\/span><span class=\"result-term\">W\u2082<\/span><\/span><span class=\"field-value\" id=\"result-3\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-4\"><span class=\"field-title\"><span>Raz\u00e3o de velocidades<\/span><span class=\"result-term\">N\u2082\/N\u2081<\/span><\/span><span class=\"field-value\" id=\"result-4\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><\/div><div class=\"result-actions\"><button type=\"button\" class=\"copy-link\"><svg viewBox=\"0 0 20 20\" fill=\"currentColor\" aria-hidden=\"true\"><path d=\"M12.232 4.232a2.5 2.5 0 0 1 3.536 3.536l-1.225 1.224a.75.75 0 0 0 1.061 1.06l1.224-1.224a4 4 0 0 0-5.656-5.656l-3 3a4 4 0 0 0 .225 5.865.75.75 0 0 0 .977-1.138 2.5 2.5 0 0 1-.142-3.667l3-3Z\"\/><path d=\"M11.603 7.963a.75.75 0 0 0-.977 1.138 2.5 2.5 0 0 1 .142 3.667l-3 3a2.5 2.5 0 0 1-3.536-3.536l1.225-1.224a.75.75 0 0 0-1.061-1.06l-1.224 1.224a4 4 0 1 0 5.656 5.656l3-3a4 4 0 0 0-.225-5.865Z\"\/><\/svg><span class=\"copy-link__text\">Copiar link para este c\u00e1lculo<\/span><\/button><span class=\"sr-only\" role=\"status\" id=\"copy-link-status\"><\/span><\/div><\/div><a href=\"#respond\" class=\"hidden transition-opacity duration-300 opacity-0 w-50 text-sm justify-center items-center gap-2 px-4 py-2 rounded bg-gray-200 text-gray-700 hover:bg-gray-300\" id=\"leave-comment\"><span class=\"icon icon-comments\" aria-hidden=\"true\"><\/span>Deixar um coment\u00e1rio<\/a><\/form><\/section><section id=\"calc-reactions\" class=\"not-prose hidden my-12 bg-gradient-to-r from-primary-50 to-gray-50 border border-indigo-100 rounded-xl px-6 py-4 shadow-sm\" data-post=\"2110\" aria-live=\"polite\" aria-labelledby=\"calc-reactions-title\"><p id=\"calc-reactions-title\" class=\"text-sm text-gray-500 text-center mb-2\">O que voc\u00ea achou deste resultado?<\/p><div role=\"group\" aria-labelledby=\"calc-reactions-title\" class=\"grid grid-cols-3 sm:flex sm:flex-row sm:justify-around gap-4 sm:items-center sm:flex-wrap\"><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"like\"><span class=\"reaction-count\" data-reaction-count=\"like\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude00 <\/span><span class=\"reaction-description font-medium\">Curti <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"helpful\"><span class=\"reaction-count\" data-reaction-count=\"helpful\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\udca1 <\/span><span class=\"reaction-description font-medium\">\u00datil <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"confused\"><span class=\"reaction-count\" data-reaction-count=\"confused\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude15 <\/span><span class=\"reaction-description font-medium\">Confuso <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"disappointed\"><span class=\"reaction-count\" data-reaction-count=\"disappointed\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude1e <\/span><span class=\"reaction-description font-medium\">Decepcionado <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"inaccurate\"><span class=\"reaction-count\" data-reaction-count=\"inaccurate\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\u274c <\/span><span class=\"reaction-description font-medium\">Impreciso <\/span><\/button><\/div><div id=\"reaction-message\" class=\"hidden mt-8 rounded-md border border-primary-100 bg-white\/50 backdrop-blur-sm px-4 py-2 text-sm text-center shadow-sm\"><\/div><\/section><div class=\"calcdash-ad not-prose calcdash-ad--calc_result calcdash-ad--in-article\"><ins class=\"adsbygoogle\" style=\"display:block\" data-ad-client=\"ca-pub-1721569815777345\" data-ad-slot=\"6317458308\" data-ad-layout=\"in-article\" data-ad-format=\"fluid\"><\/ins><script>(adsbygoogle = window.adsbygoogle || []).push({});<\/script><\/div>\n<style id=\"wpcoderpro-inline-1\">.formula-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section class=\"formula-box\" aria-labelledby=\"formula-title\">\r\n\t<div id=\"formula-title\" class=\"not-prose font-display mb-4\"><span class=\"icon icon-formula\" aria-hidden=\"true\"><\/span><h2>F\u00f3rmula das leis de afinidade de ventiladores<\/h2><\/div>\r\n\t<figure class=\"not-prose formula\">\r\n\t\t<figcaption class=\"formula-title\">F\u00f3rmula<\/figcaption>\r\n\t\t<div class=\"text-base text-gray-800\" id=\"formula\">\n\\[ r = \\frac{N_2}{N_1}, \\qquad Q_2 = Q_1 \\left( \\frac{N_2}{N_1} \\right)^1, \\qquad P_2 = P_1 \\left( \\frac{N_2}{N_1} \\right)^2, \\qquad W_2 = W_1 \\left( \\frac{N_2}{N_1} \\right)^3 \\]\n<\/div>\r\n\t<\/figure>\r\n\t<\/p>\n<p><strong>Onde:<\/strong><\/p>\n<ul>\n<li>\\(N_1\\), \\(N_2\\) \u2014 rota\u00e7\u00f5es original e nova do ventilador (rpm)<\/li>\n<li>\\(Q_1\\), \\(Q_2\\) \u2014 vaz\u00f5es original e nova (m\u00b3\/h ou CFM)<\/li>\n<li>\\(P_1\\), \\(P_2\\) \u2014 press\u00f5es original e nova (Pa ou inH\u2082O)<\/li>\n<li>\\(W_1\\), \\(W_2\\) \u2014 pot\u00eancias original e nova no eixo (kW ou cv)<\/li>\n<li>\\(r\\) \u2014 rela\u00e7\u00e3o de rota\u00e7\u00e3o \\(N_2 \/ N_1\\)<\/li>\n<\/ul>\n<p>As tr\u00eas leis de afinidade de ventiladores estabelecem que, para o mesmo ventilador operando no mesmo ponto da sua curva caracter\u00edstica, a vaz\u00e3o varia linearmente com a rota\u00e7\u00e3o, a press\u00e3o com o quadrado da rota\u00e7\u00e3o e a pot\u00eancia com o cubo da rota\u00e7\u00e3o.<\/p>\n<p>\r\n<\/section>\n<style id=\"wpcoderpro-inline-2\">.calculation-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section id=\"calculation\" class=\"calculation-box\" aria-labelledby=\"calculation-title\">\r\n\t<div id=\"calculation-title\" class=\"not-prose font-display\"><span class=\"icon icon-unordered-list\" aria-hidden=\"true\"><\/span><h2>Leis de afinidade de ventiladores \u2013 Exemplo de c\u00e1lculo<\/h2><\/div>\r\n\r\n<\/p>\n<p><strong>Exemplo:<\/strong> um ventilador entrega 5000 m\u00b3\/h a 300 Pa e consome 2,5 kW a 1450 rpm. Estime seu desempenho se a rota\u00e7\u00e3o for reduzida para 950 rpm.<\/p>\n<p>\\[ r = \\frac{N_2}{N_1} = \\frac{950}{1450} = 0.6552 \\]<\/p>\n<p>\\[ Q_2 = 5000 \\times 0.6552 = 3275.9 \\ \\text{m}^3\/\\text{h} \\]<\/p>\n<p>\\[ P_2 = 300 \\times 0.6552^2 = 300 \\times 0.4293 = 128.8 \\ \\text{Pa} \\]<\/p>\n<p>\\[ W_2 = 2.5 \\times 0.6552^3 = 2.5 \\times 0.2812 = 0.703 \\ \\text{kW} \\]<\/p>\n<p><strong>Resultado:<\/strong> a 950 rpm o ventilador desloca cerca de 3275,9 m\u00b3\/h, desenvolve 128,8 Pa de press\u00e3o e consome apenas 0,703 kW \u2014 uma redu\u00e7\u00e3o de 72% na pot\u00eancia a partir de uma redu\u00e7\u00e3o de 34% na rota\u00e7\u00e3o.<\/p>\n<p>\n\r\n<\/section>\n<h2>Como usar a calculadora<\/h2>\n<ol>\n<li>Informe a <strong>Rota\u00e7\u00e3o original do ventilador (N\u2081)<\/strong> em rpm \u2014 a rota\u00e7\u00e3o na qual voc\u00ea conhece o desempenho do ventilador.<\/li>\n<li>Informe a <strong>Nova rota\u00e7\u00e3o do ventilador (N\u2082)<\/strong> em rpm \u2014 a rota\u00e7\u00e3o que voc\u00ea deseja avaliar.<\/li>\n<li>Informe a <strong>Vaz\u00e3o original (Q\u2081)<\/strong> e selecione sua unidade, m\u00b3\/h ou CFM.<\/li>\n<li>Informe a <strong>Press\u00e3o original (P\u2081)<\/strong> e selecione Pa ou inH\u2082O.<\/li>\n<li>Informe a <strong>Pot\u00eancia original (W\u2081)<\/strong> e selecione kW ou cv.<\/li>\n<li>Deixe a caixa <strong>Rela\u00e7\u00e3o de rota\u00e7\u00e3o (N\u2082 \/ N\u2081)<\/strong> marcada se quiser ver a raz\u00e3o usada nos c\u00e1lculos e, em seguida, leia a nova vaz\u00e3o, press\u00e3o e pot\u00eancia nos resultados.<\/li>\n<\/ol>\n<h2>O que s\u00e3o as leis de afinidade de ventiladores<\/h2>\n<p>As leis de afinidade (tamb\u00e9m chamadas de leis dos ventiladores) s\u00e3o um conjunto de rela\u00e7\u00f5es de escala que descrevem como o desempenho de um ventilador muda quando sua rota\u00e7\u00e3o \u00e9 alterada. Elas valem para o mesmo ventilador, com o mesmo di\u00e2metro de rotor, trabalhando com a mesma densidade de g\u00e1s. As leis decorrem diretamente da an\u00e1lise dimensional da geometria do ventilador e da f\u00edsica do escoamento de ar atrav\u00e9s dele.<\/p>\n<p>As tr\u00eas rela\u00e7\u00f5es s\u00e3o simples, mas poderosas. A vaz\u00e3o \u00e9 diretamente proporcional \u00e0 rota\u00e7\u00e3o: reduza a metade das rpm e voc\u00ea move metade do volume de ar. A press\u00e3o cresce com o quadrado da rota\u00e7\u00e3o: reduza a metade das rpm e a press\u00e3o desenvolvida cai a um quarto. A pot\u00eancia cresce com o cubo da rota\u00e7\u00e3o: reduza a metade das rpm e a pot\u00eancia consumida cai a um oitavo. Essa rela\u00e7\u00e3o c\u00fabica \u00e9 a raz\u00e3o pela qual os acionamentos de velocidade vari\u00e1vel (inversores de frequ\u00eancia) s\u00e3o uma medida de economia de energia t\u00e3o eficaz em sistemas de HVAC.<\/p>\n<p>Interpretar os resultados \u00e9 simples. Se a nova rota\u00e7\u00e3o for menor que a original, espere menos vaz\u00e3o, bem menos press\u00e3o e dramaticamente menos pot\u00eancia. Se a nova rota\u00e7\u00e3o for maior, vale o contr\u00e1rio \u2014 e a lei c\u00fabica faz a pot\u00eancia subir r\u00e1pido, portanto verifique sempre se o motor e os limites estruturais do ventilador suportam o aumento. Observe que os resultados s\u00f3 s\u00e3o v\u00e1lidos nas proximidades do mesmo ponto de opera\u00e7\u00e3o; deslocar-se ao longo da curva do ventilador a rota\u00e7\u00e3o fixa \u00e9 um c\u00e1lculo diferente.<\/p>\n<h2>Premissas, limita\u00e7\u00f5es e dicas pr\u00e1ticas<\/h2>\n<ul>\n<li><strong>Mesmo ventilador, mesmo sistema:<\/strong> as leis assumem o mesmo rotor, a mesma rede de dutos e o mesmo ponto de opera\u00e7\u00e3o escalado ao longo da curva do sistema. Se voc\u00ea alterar os dutos ou os dampers, o ponto de opera\u00e7\u00e3o se move de outra forma.<\/li>\n<li><strong>Densidade do ar constante:<\/strong> os resultados assumem que a densidade do g\u00e1s n\u00e3o muda entre as duas rota\u00e7\u00f5es. Varia\u00e7\u00f5es significativas de temperatura ou altitude introduzem erros.<\/li>\n<li><strong>Comportamento ideal do ventilador:<\/strong> ventiladores reais se desviam um pouco das leis ideais, especialmente em rota\u00e7\u00f5es muito baixas ou distantes do ponto de melhor rendimento, onde a efici\u00eancia cai.<\/li>\n<li><strong>A pot\u00eancia \u00e9 a do eixo:<\/strong> a \\(W_2\\) calculada \u00e9 a pot\u00eancia entregue ao eixo do ventilador. Para estimar a entrada el\u00e9trica, divida pela efici\u00eancia do motor e do acionamento, que tamb\u00e9m varia com a carga.<\/li>\n<li><strong>Limites do motor ao acelerar:<\/strong> antes de aumentar a rota\u00e7\u00e3o do ventilador, verifique a pot\u00eancia nominal do motor, a resist\u00eancia das correias e a rota\u00e7\u00e3o m\u00e1xima recomendada pelo fabricante. Um pequeno aumento de rota\u00e7\u00e3o pode exigir uma quantidade desproporcional de pot\u00eancia extra.<\/li>\n<li><strong>Regra pr\u00e1tica \u00fatil:<\/strong> por causa da lei c\u00fabica, uma redu\u00e7\u00e3o de apenas 10% na rota\u00e7\u00e3o economiza cerca de 27% da pot\u00eancia \u2014 uma das medidas de efici\u00eancia energ\u00e9tica mais baratas dispon\u00edveis em ventila\u00e7\u00e3o.<\/li>\n<\/ul>\n<p>Se voc\u00ea estiver dimensionando o pr\u00f3prio sistema de transmiss\u00e3o, a calculadora de <a href=\"https:\/\/wpcalc.com\/pt\/engenharia\/comprimento-da-correia\/\">Comprimento de correia<\/a> ajuda com ventiladores acionados por polias, enquanto a calculadora de <a href=\"https:\/\/wpcalc.com\/en\/engineering\/pump-power\/\">Pot\u00eancia de bomba<\/a> cobre o caso hidr\u00e1ulico an\u00e1logo. Para entender o regime de escoamento dentro dos dutos, a calculadora de <a href=\"https:\/\/wpcalc.com\/en\/engineering\/reynolds-number\/\">N\u00famero de Reynolds<\/a> e a de <a href=\"https:\/\/wpcalc.com\/en\/engineering\/pipe-pressure-drop\/\">Queda de press\u00e3o em tubula\u00e7\u00e3o<\/a> s\u00e3o boas companheiras.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Calcule a vaz\u00e3o, a press\u00e3o e a pot\u00eancia de um ventilador em uma nova rota\u00e7\u00e3o usando as leis de afinidade. Informe a rota\u00e7\u00e3o, a vaz\u00e3o, a press\u00e3o e a pot\u00eancia originais, al\u00e9m da nova rota\u00e7\u00e3o em rpm.<\/p>\n","protected":false},"author":3168,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[6],"tags":[75],"class_list":["post-2110","post","type-post","status-publish","format-standard","hentry","category-engenharia","tag-ventilacao"],"acf":[],"_links":{"self":[{"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/posts\/2110","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/users\/3168"}],"replies":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/comments?post=2110"}],"version-history":[{"count":0,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/posts\/2110\/revisions"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/media?parent=2110"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/categories?post=2110"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/tags?post=2110"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}