{"id":100090,"date":"2026-02-15T20:17:44","date_gmt":"2026-02-15T20:17:44","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100090"},"modified":"2026-07-12T03:29:04","modified_gmt":"2026-07-12T03:29:04","slug":"fan-shaft-power","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/sl\/calculators\/fan-shaft-power\/","title":{"rendered":"Ocena mo\u010di na gredi ventilatorja | Usklajen tlak in izkoristek"},"content":{"rendered":"\r\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"Fan Shaft Power Estimate from Matched Pressure and Efficiency\",\"description\":\"Estimate air power and fan shaft power from airflow,pressure rise and a matching total or static fan efficiency;does not size a motor.\",\"url\":\"https:\/\/vibromera.eu\/calculators\/fan-shaft-power\/\",\"applicationCategory\":\"Engineering 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class=\"vc-calculator\" id=\"vc-fan-power\"><header class=\"vc-header\"><p class=\"vc-header-eyebrow\">Matched pressure and efficiency required<\/p><h1 class=\"vc-header-title\">Fan Shaft Power Estimate<\/h1><p class=\"vc-header-subtitle\">Estimate air power and fan shaft power at one documented operating point. The selected pressure basis must match the efficiency basis; motor electrical input and motor selection are not calculated.<\/p><div class=\"vc-badges\"><span class=\"vc-badge\">Pair total with total<\/span><span class=\"vc-badge\">Pair static with static<\/span><span class=\"vc-badge\">Not an ISO test<\/span><\/div><\/header>\r\n<div class=\"vc-card\"><form class=\"vc-form\" id=\"vc-form\" autocomplete=\"off\"><div class=\"vc-form-grid\"><div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-flow\">Volume flow rate at operating point <span class=\"vc-label-hint\">(m\u00b3\/s)<\/span><\/label><input class=\"vc-input\" id=\"vc-flow\" inputmode=\"decimal\" type=\"text\"><\/div><div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-dp\">Fan pressure rise at same point <span class=\"vc-label-hint\">(Pa)<\/span><\/label><input class=\"vc-input\" id=\"vc-dp\" inputmode=\"decimal\" type=\"text\"><\/div><div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-pbasis\">Pressure basis<\/label><select class=\"vc-select\" id=\"vc-pbasis\"><option value=\"\">Select\u2026<\/option><option value=\"total\">Fan total pressure rise<\/option><option value=\"static\">Fan static pressure rise<\/option><\/select><\/div><div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-eff\">Fan efficiency at same operating point <span class=\"vc-label-hint\">(decimal,0&lt;\u03b7\u22641)<\/span><\/label><input class=\"vc-input\" id=\"vc-eff\" inputmode=\"decimal\" type=\"text\"><\/div><div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-ebasis\">Efficiency basis<\/label><select class=\"vc-select\" id=\"vc-ebasis\"><option value=\"\">Select\u2026<\/option><option value=\"total\">Fan total efficiency<\/option><option value=\"static\">Fan static efficiency<\/option><\/select><\/div><div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-source\">Test report \/ fan curve \/ operating-point source<\/label><input class=\"vc-input\" id=\"vc-source\" type=\"text\" maxlength=\"500\"><\/div><\/div><p id=\"vc-error\" role=\"alert\" style=\"margin:.75rem 0 0;color:#b42318\"><\/p><div class=\"vc-warning-box\"><p style=\"margin:0\"><strong>Boundary:<\/strong> use Q,\u0394p and \u03b7 from the same operating point,gas\/test basis and fan configuration. Do not combine static pressure with total efficiency or total pressure with static efficiency. System effects,air density\/test conversion,drive losses,motor efficiency and off-curve operation require separate treatment.<\/p><\/div><\/form><div class=\"vc-results\" id=\"vc-results\"><div class=\"vc-results-head\"><h2 class=\"vc-results-title\">Operating-point power estimate<\/h2><button type=\"button\" class=\"vc-copy-btn\" id=\"vc-copy-btn\">Copy<\/button><\/div><div class=\"vc-result-grid\"><div class=\"vc-rcard vc-rcard-primary\"><div class=\"vc-rcard-label\">Estimated fan shaft power<\/div><div class=\"vc-rcard-value\" id=\"vc-r-shaft\">\u2014<\/div><\/div><div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Air power on selected basis<\/div><div class=\"vc-rcard-value\" id=\"vc-r-air\">\u2014<\/div><\/div><div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Mechanical horsepower<\/div><div class=\"vc-rcard-value\" id=\"vc-r-hp\">\u2014<\/div><\/div><div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Flow conversion<\/div><div class=\"vc-rcard-value\" id=\"vc-r-flowh\">\u2014<\/div><\/div><div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Motor input\/size<\/div><div class=\"vc-rcard-value\" id=\"vc-r-motor\">Not calculated<\/div><\/div><div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Basis<\/div><div class=\"vc-rcard-value\" id=\"vc-r-basis\">\u2014<\/div><\/div><\/div><p id=\"vc-r-note\" style=\"margin:0;color:var(--vc-ink-secondary)\"><\/p><\/div><\/div>\r\n<div class=\"vc-section vc-open\"><button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"true\"><span class=\"vc-section-toggle-text\"><span class=\"vc-section-icon\">\ud83d\udcd8<\/span><span class=\"vc-section-title\">Formula,standard status and exclusions<\/span><\/span><\/button><div class=\"vc-section-body\"><div class=\"vc-section-inner vc-theory\"><p>For a matched pressure\/efficiency basis,the air-power magnitude is <strong>P<sub>air<\/sub>=Q\u0394p<\/strong> W and the estimated fan shaft power is <strong>P<sub>shaft<\/sub>=Q\u0394p\/\u03b7<\/strong> W. Thus with Q in m\u00b3\/s and \u0394p in Pa,the result is watts because Pa\u00b7m\u00b3\/s=N\u00b7m\/s=W.<\/p><p>The U.S. Department of Energy fan test-procedure material distinguishes static air power for relevant unducted configurations from total air power for ducted configurations. Mixing pressure and efficiency definitions creates a physically inconsistent estimate.<\/p><p>The official ISO catalogue lists <a href=\"https:\/\/www.iso.org\/standard\/56517.html\" target=\"_blank\" rel=\"noopener\">ISO5801:2017,edition3<\/a> as Published but to be revised,with Amendment1:2025 and a replacement project under development. It governs fan performance testing using standardized airways;this simple calculation is not an ISO5801 test or certified conversion.<\/p><p>Mechanical horsepower uses the NIST SP811 value 1hp(550ft\u00b7lbf\/s)=745.6999W. \u201chp\u201d here is not metric horsepower or electrical horsepower.<\/p><div class=\"vc-warning-box\"><p style=\"margin:0\"><strong>No universal efficiency or motor factor:<\/strong> the removed fan-type efficiency ranges and 1.15\u20131.25 motor multiplier were not adequate for selection. Use the certified fan curve\/test point,drive and motor efficiencies,service factor,duty,starting\/overload behavior,ambient\/temperature,applicable electrical code and manufacturer data.<\/p><\/div><p>Sources:<a href=\"https:\/\/www.energy.gov\/sites\/default\/files\/2022-06\/fanblower-nopr-tp.pdf\" target=\"_blank\" rel=\"noopener\">DOE fan\/blower test-procedure material<\/a>;<a href=\"https:\/\/www.iso.org\/standard\/56517.html\" target=\"_blank\" rel=\"noopener\">ISO5801 status\/scope<\/a>;<a href=\"https:\/\/www.nist.gov\/pml\/special-publication-811\/nist-guide-si-appendix-b-conversion-factors\/nist-guide-si-appendix-b9\" target=\"_blank\" rel=\"noopener\">NIST power conversions<\/a>.<\/p><\/div><\/div><\/div><footer class=\"vc-footer\"><p>\u00a92024\u20132026 <a href=\"https:\/\/vibromera.eu\/\">Vibromera<\/a><\/p><p>Reference operating-point estimate only;not a fan performance test,motor selection or compliance approval. Scientific review:July2026.<\/p><\/footer><\/div>\r\n<script>(function(){'use strict';var HPW=745.6999;function $(i){return document.getElementById(i)}function pnum(s){s=s.trim().replace(',','.');return \/^[+]?(?:\\d+(?:\\.\\d*)?|\\.\\d+)$\/.test(s)?Number(s):NaN}function clear(){['vc-r-shaft','vc-r-air','vc-r-hp','vc-r-flowh','vc-r-basis'].forEach(function(id){$(id).textContent='\u2014'});$('vc-r-motor').textContent='Not calculated';$('vc-r-note').textContent='';$('vc-results').classList.remove('vc-visible')}function calc(){var q=pnum($('vc-flow').value),dp=pnum($('vc-dp').value),eta=pnum($('vc-eff').value),pb=$('vc-pbasis').value,eb=$('vc-ebasis').value,source=$('vc-source').value.trim(),raw=[$('vc-flow').value.trim(),$('vc-dp').value.trim(),$('vc-eff').value.trim(),pb,eb,source],any=raw.some(Boolean);if(!raw.every(Boolean)){clear();$('vc-error').textContent=any?'Complete all six operating-point fields.':'';return}if(!Number.isFinite(q)||q<=0||!Number.isFinite(dp)||dp<=0||!Number.isFinite(eta)||eta<=0||eta>1){clear();$('vc-error').textContent='Use strict positive finite Q and pressure;efficiency must satisfy 0<\u03b7\u22641.';return}if(pb!==eb){clear();$('vc-error').textContent='Pressure and efficiency bases must match:total with total,or static with static.';return}var air=q*dp,shaft=air\/eta;$('vc-error').textContent='';$('vc-r-shaft').textContent=(shaft\/1000).toFixed(9)+' kW ('+shaft.toFixed(6)+' W)';$('vc-r-air').textContent=(air\/1000).toFixed(9)+' kW';$('vc-r-hp').textContent=(shaft\/HPW).toFixed(9)+' hp (mechanical)';$('vc-r-flowh').textContent=(q*3600).toFixed(6)+' m\u00b3\/h';$('vc-r-motor').textContent='Not calculated \u2014 drive\/motor data required';$('vc-r-basis').textContent=pb+' pressure + '+eb+' efficiency';$('vc-r-note').textContent='Operating-point source:'+source+' | No motor margin or electrical input has been inferred.';$('vc-results').classList.add('vc-visible');var u=new URL(location),vals=[q,dp,pb,eta,eb,source],keys=['flow_m3s','pressure_pa','pressure_basis','fan_efficiency','efficiency_basis','source'];keys.forEach(function(k,i){u.searchParams.set(k,String(vals[i]))});history.replaceState(null,'',u.toString())}$('vc-form').addEventListener('input',calc);$('vc-form').addEventListener('change',calc);$('vc-copy-btn').addEventListener('click',function(){if(navigator.clipboard)navigator.clipboard.writeText($('vc-results').innerText)});document.querySelectorAll('.vc-section-toggle').forEach(function(b){b.addEventListener('click',function(){var s=this.closest('.vc-section');s.classList.toggle('vc-open');this.setAttribute('aria-expanded',s.classList.contains('vc-open'))})});var p=new URLSearchParams(location.search),keys=['flow_m3s','pressure_pa','pressure_basis','fan_efficiency','efficiency_basis','source'],ids=['vc-flow','vc-dp','vc-pbasis','vc-eff','vc-ebasis','vc-source'];keys.forEach(function(k,i){if(p.has(k))$(ids[i]).value=p.get(k)});calc()})();<\/script>\r\n","protected":false},"excerpt":{"rendered":"<p>Estimate fan air and shaft power from one operating point using matched total or static pressure and efficiency;motor sizing is not performed.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[],"tags":[],"class_list":["post-100090","calculator","type-calculator","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/sl\/wp-json\/wp\/v2\/calculator\/100090","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/sl\/wp-json\/wp\/v2\/calculator"}],"about":[{"href":"https:\/\/vibromera.eu\/sl\/wp-json\/wp\/v2\/types\/calculator"}],"version-history":[{"count":2,"href":"https:\/\/vibromera.eu\/sl\/wp-json\/wp\/v2\/calculator\/100090\/revisions"}],"predecessor-version":[{"id":102391,"href":"https:\/\/vibromera.eu\/sl\/wp-json\/wp\/v2\/calculator\/100090\/revisions\/102391"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/sl\/wp-json\/wp\/v2\/media?parent=100090"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/sl\/wp-json\/wp\/v2\/categories?post=100090"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/sl\/wp-json\/wp\/v2\/tags?post=100090"}],"curies":[{"name":"delovni list","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}