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class="back">返回列表</a> </div> <div class="ar_con"> <p> <span style="line-height:2;font-size:16px;">在我們風機有很多的數據，今天給大家說下風機幾個比較典型的數據，風機的、靜壓、動壓和全壓，下面<strong><a href="/product-1044.html" target="_blank">貴州風機廠家</a></strong>來給大家說下。</span> </p> <p> <span style="line-height:2;font-size:16px;">例如一個100m高的防煙樓梯間要設置正壓送風,(比如Rm取4.5Pa/m(磚砌,沒有抹灰))</span> </p> <span style="line-height:2;font-size:16px;">100m x 4.5pa/m = 450pa + 50pa(余壓) = 500pa</span><br /> <span style="line-height:2;font-size:16px;">靜壓、動壓、全壓</span><br /> <br /> <span style="line-height:2;font-size:16px;">在選擇空調或風機時，常常會遇到靜壓、動壓、全壓這三個概念。根據流體力學知識，流體作用在單位面積上所垂直力稱為壓力。當空氣沿風管內壁流動時，其壓力可分為靜壓、動壓和全壓，單位是 mmHg或 kg／m2或 Pa，我國的法定單位是 Pa。</span><br /> <br /> <span style="line-height:2;font-size:16px;">a. 靜壓(Pi)</span><br /> <br /> <span style="line-height:2;font-size:16px;">由于空氣分子不規則運動而撞擊于管壁上產生的壓力稱為靜壓。計算時，以絕對真空為計算零點的靜壓稱為絕對靜壓。以</span><span style="line-height:2;font-size:16px;">大氣壓力</span><span style="line-height:2;font-size:16px;">為零點的靜壓稱為相對靜壓?？照{中的空氣靜壓均指相對靜壓。靜壓高于大氣壓時為正值，低于大氣壓時為負值。</span><br /> <img src="http://img01.fuhai360.com/gyjzx/201704/201704171720365669.png" title="貴州風機廠家" alt="貴州風機廠家" /><br /> <span style="line-height:2;font-size:16px;">b. 動壓(Pb)</span><br /> <br /> <span style="line-height:2;font-size:16px;">指空氣流動時產生的壓力，只要風管內空氣流動就具有一定的動壓，其值永遠是正的。</span><br /> <br /> <span style="line-height:2;font-size:16px;">c. 全壓(Pq)</span><br /> <br /> <span style="line-height:2;font-size:16px;">全壓是靜壓和動壓的代數和： Pq＝Pi十Pb 全壓代表 l m3氣體所具有的總能量。若以大氣壓為計算的起點，它可以是正值，亦可以是負值。</span><span style="line-height:2;font-size:16px;"></span> </div> <div class="record"> <span class="prevrecord">上一條：<a href="/content/527.html"> 空壓機和鼓風機?在結構、原理和用途上的區別講解</a></span> <span class="prevrecord">下一條：<a href="/content/525.html"> 消除風機在工作時候產生的噪音的三種辦法</a></span> </div> <h4 class="related"> <span>相關文章</span></h4> <div class='relatedlist'> <ul class="relate_news"> <li><a href='/content/94.html' 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