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class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價格要求：</span>面議</p><p><span>所在地：</span>上海市</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關鍵詞：</span>冰龍R22價錢,制冷劑</p><p><span>***更新：</span>2021-02-04 00:26:28</p><p><span id="click" >瀏覽次數(shù)：2次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="qzh3i3u" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">上海冰仆冷暖設備有限公司</a></p><p><span>聯(lián)系人：</span>徐佳華</p><p><span>郵箱: </span>444054147@qq.com</p><p><span>電話: </span>13761656620</p><p><span>傳真: </span>1_1</p><p><span>網(wǎng)址: </span>https://www.shbpln.com</p><p><span>手機: </span>1-1</p><p><span>地址: </span>美丹路222號629室</p><p>[當前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="ihotkrd" class="page-proshow02"><p class="title">詳細說明</p><div id="u8xmt7f" class="box"><p><p style="text-indent:25px">二十世紀初，制冷系統(tǒng)開始作為大型建筑的空氣調(diào)節(jié)手段。位于德克薩斯圣安東尼奧的梅蘭大廈是首先個全空調(diào)高層辦公樓，冰龍R22價錢，冰龍R22價錢。1926年，托馬斯.米奇尼（Thomas Midgely）開發(fā)了首臺CFC（氯氟碳）機器，使用R-12，冰龍R22價錢. CFC族（氯氟碳）不可燃、無毒（和二氧化硫相比時）并且能效高。該機器于1931年開始商業(yè)生產(chǎn)并很快進入家用。威利斯.開利（Willis Carrier）開發(fā)了首先臺商用離心式制冷機，開創(chuàng)了制冷和空調(diào)的紀元。20世紀30年代，一系列鹵代烴制冷劑相繼出現(xiàn)，杜邦公司將其命名為氟利昂（Freon）。要求制冷劑的臭氧消耗潛能值與全球變暖潛能值盡可能小，以減小對大氣臭氧層的破壞及引起全球氣候變暖。冰龍R22價錢</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="冰龍R22價錢,制冷劑" src="https://tyunfile.71360.com/UploadFile/bingpu/637401016739995559/6821260.png"></div><p style="text-indent:25px">空調(diào)制冷劑過去選用R12，目前大多選用R134a?？紤]制冷劑的性質(zhì)。根據(jù)制冷劑的熱力性質(zhì)、物理性質(zhì)和化學性質(zhì)，選用那些無毒、不、不燃燒的制冷劑；選用制冷劑應傳熱好、阻力小、與制冷系統(tǒng)用材料相容性好?？紤]壓縮機的類型。不同的制冷壓縮機的工作原理有所不同。體積式壓縮機是通過縮小制冷劑蒸氣的體積提高其壓力的，一般選用單位體積制冷量大的制冷劑，如R134a,R22等。制冷劑的種類很多，隨著科學技術的進步．新工質(zhì)不斷出現(xiàn)，以適宜于不同的制冷裝置。冰龍R22價錢制冷劑需具有優(yōu)良的熱力學特性，以便能在給定的溫度區(qū)域內(nèi)運行時有較高的循環(huán)效率。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="冰龍R22價錢,制冷劑" src="https://tyunfile.71360.com/UploadFile/bingpu/637401016697905704/2303191.png"></div><p style="text-indent:25px">制冷劑飽和蒸氣的溫度與壓力呈對應關系，若已知制冷劑的蒸發(fā)溫度即可查出相對應的蒸發(fā)壓力。此壓力的表壓值由高、低壓壓力表顯示出來。因此，根據(jù)安裝在系統(tǒng)上壓力表的壓力值即可判斷制冷劑的充注量是否宜適。例如：空調(diào)器的蒸發(fā)溫度為7.2℃，冷凝溫度為54.5℃使用R22。查R22的飽和溫度與飽和壓力對應表，以確定其蒸發(fā)壓力值和冷凝壓力值。查表可知：R22在7.2℃時相應相對壓力值為0.53Mpa(5.3kg/cm2)和54.5℃時的相應相對壓力值為2.11Mpa(21.1kg/cm2)，將此壓力換算為表壓值即可。用高、低壓壓力表或復合式壓力表測試充氟中的制冷系統(tǒng)，若高、低壓力表表壓值符合上述范圍即表明制冷劑的充注量合適;若高、低壓壓力均低則表明充入量不夠;若高、低壓壓力均高，則表明充入量過多。壓力測定法較為簡便，在維修時經(jīng)常作用，但是缺點是比較粗，準確度不高。</p><p style="text-indent:25px">氨的比重和粘度小，放熱系數(shù)高，價格便宜，易于獲得。但是，氨有較強的毒性和可燃性。若以容積計，當空氣中氨的含量達到0.5%～0.6%時，人在其中停留半個小時即可中毒，達到11%～13%時即可點燃，達到16%時遇明火就會。因此，氨制冷機房必須注意通風排氣，并需經(jīng)常冰箱排除系統(tǒng)中的空氣及其它不凝性氣體。總上所述，氨作為制冷劑的優(yōu)點是：易于獲得、價格低廉、壓力適中、單位制冷量大、放熱系數(shù)高、幾乎不溶解于油、流動阻力小，泄漏時易發(fā)現(xiàn)。其缺點是：有刺激性臭味、有毒、可以燃燒和，對銅及銅合金有腐蝕作用。制冷劑在冷凝器中將熱量傳遞給周圍空氣或水而冷凝。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="冰龍R22價錢,制冷劑" src="https://tyunfile.71360.com/UploadFile/bingpu/637401017496743481/4527677.png"></div><p style="text-indent:25px">制冷劑性質(zhì)要求：（1）具有優(yōu)良的熱力學特性，以便能在給定的溫度區(qū)域內(nèi)運行時有較高的循環(huán)效率。具體要求為：臨界溫度高于冷凝溫度、與冷凝溫度對應的飽和壓力不要太高、標準沸點較低、流體比熱容小、制冷劑絕熱指數(shù)低、單位容積制熱量較大等。（2）具有優(yōu)良的熱物理性能具體要求為：較高的傳熱系數(shù)、較低的粘度及較小的密度。（3）具有良好的化學穩(wěn)定性要求工質(zhì)在高溫下具有良好的化學穩(wěn)定性，保證在較高工作溫度下工質(zhì)不發(fā)生分解。（4）與潤滑油有良好互溶性。（5）安全性工質(zhì)應無毒、無刺激性、無燃燒性及性。制冷劑需有良好的電氣絕緣性。冰龍R22價錢</p><p style="text-indent:25px">非共沸制冷劑由兩種或兩種以上的制冷劑按一定的比例混合而成。冰龍R22價錢</p><p style="text-indent:25px">R-134a(代號：R134a）分子式： CH 2 FCF 3 （四氟乙烷），分子量：102.03，沸點：-26.26℃ ，凝固點：-96.6°C ，臨界溫度：101.1 ℃ ，臨界壓力：4067kpa，飽和液體密度：25℃ ， 1.207g/cm 3 ，液體比熱：25℃ ， 1.51KJ/(Kg·℃)，溶解度( 水中， 25℃ ) ：0.15% ，臨界密度：0.512g/cm3，破壞臭氧潛能值（ ODP ）：0 ，全球變暖系數(shù)值（ GWP ）：0.29，沸點下蒸發(fā)潛能 :215 kJ/kg，質(zhì)量指標：純度 ≥ 99.9 % ，水份PPm≤ 0.0010，酸度 PPm≤ 0.00001 ，蒸發(fā)殘留物PPm≤ 0.01，R134a作為R12的替代制冷劑，它的許多特性與R12很相像。R134a的毒性非常低，在空氣中不可燃，安全類別為A1，是很安全的制冷劑。冰龍R22價錢</p><p style="text-indent:25px">上海冰仆冷暖設備有限公司是一家銷售:制拎設備、化工產(chǎn)品(除危險化學品、監(jiān)控化學品、煙花爆竹、民用物品、易制毒化學品)、儀器儀表、汽車配件，機械配件、五金電器、焊接工具。銷售:制拎設備、化工產(chǎn)品(除危險化學品、監(jiān)控化學品、煙花爆竹、民用物品、易制毒化學品)、儀器儀表、汽車配件，機械配件、五金電器、焊接工具。的公司，致力于發(fā)展為創(chuàng)新務實、誠實可信的企業(yè)。公司自創(chuàng)立以來，投身于制冷劑廠家直銷，冷凍油廠家直銷，壓縮機批發(fā)銷售，制冷配件批發(fā)銷售，是化工的主力軍。冰仆冷暖設備繼續(xù)堅定不移地走高質(zhì)量發(fā)展道路，既要實現(xiàn)基本面穩(wěn)定增長，又要聚焦關鍵領域，實現(xiàn)轉(zhuǎn)型再突破。冰仆冷暖設備始終關注化工市場，以敏銳的市場洞察力，實現(xiàn)與客戶的成長共贏。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/3146518.html</p></div></div></div></div></div><div id="8n4giar" class="page-right twoColRt"><div id="i8d3ue8" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="wace8x9" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img src="http://tyunfile.71360.com/UpLoadFile/2019/11/1/14/637082168864691056_lgpj_5374157.jpg" alt="福建ZF配件哪家強信息推薦自業(yè)物資供應" class="vcenter" 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