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onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="yxurjvs" 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(guān)鍵詞：</span>浙江高效制冷劑,制冷劑</p><p><span>***更新：</span>2020-12-24 01:19:07</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="yn2x2cs" 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(shè)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(dāng)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="ba48jwt" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="crwdkrt" class="box"><p><p style="text-indent:25px">根據(jù)對國內(nèi)外大中型冷庫制冷劑使用情況的調(diào)研，分析了大中型冷庫制冷劑的現(xiàn)狀。根據(jù)國際上較新的文獻(xiàn)，評論了冷庫制冷劑應(yīng)用的發(fā)展新動向。結(jié)果表明：在國內(nèi)外大中型冷庫中，浙江高效制冷劑，目前采用氨制冷劑是主流，浙江高效制冷劑，今后氨仍然將是主要制冷劑。在蒸發(fā)溫度-35℃以上，壓縮式制冷采用氨制冷劑是較節(jié)能的。采用氨制冷劑的關(guān)鍵問題是安全問題，浙江高效制冷劑。在制冷劑的發(fā)展動向中，CO2系統(tǒng)成為新一代制冷劑關(guān)注的重點，CO2/NH3復(fù)疊式制冷系統(tǒng)具有較大的發(fā)展?jié)摿ΑＴ陂g接制冷系統(tǒng)中，采用氨水替代乙二醇作為載冷劑，可以使系統(tǒng)能耗明顯降低。如氟利昂，共沸混合工質(zhì)、碳?xì)浠衔铩钡榷际侵评鋭?；浙江高效制冷?/p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="浙江高效制冷劑,制冷劑" src="https://tyunfile.71360.com/UploadFile/bingpu/637401017212290390/4707099.png"></div><p style="text-indent:25px">制冷劑飽和蒸氣的溫度與壓力呈對應(yīng)關(guān)系，若已知制冷劑的蒸發(fā)溫度即可查出相對應(yīng)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(yīng)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(yīng)相對壓力值為0.53Mpa(5.3kg/cm2)和54.5℃時的相應(yīng)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(fù)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(zhǔn)確度不高。浙江高效制冷劑混合共沸制冷劑在空氣冷凝的前提下，蒸發(fā)溫度可以達(dá)到-150度左右。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="浙江高效制冷劑,制冷劑" src="https://tyunfile.71360.com/UploadFile/bingpu/637401016165923170/7418519.png"></div><p style="text-indent:25px">R142b制冷劑，沸點較高-9.25℃.凝固點-130.8℃較大特點是在很高的冷凝溫度下，冷凝壓力并不高。如80℃時只有1.35Mpa，因此它適合在熱泵裝置和高環(huán)境溫度下使用。對大氣臭氧層有微弱的破壞作用，也將在2040年禁用。R134a，沸點-26.5℃，凝固點-101℃，無色，無味，不燃，不爆，但與礦物性潤滑油不相溶，必須采用聚脂類合成油（如聚烯烴乙二醇），與丁腈橡膠不相溶，故密封件須改為聚丁腈橡膠，吸水性較強，易與水反映生成酸，腐蝕管絡(luò)及壓縮機，對系統(tǒng)干燥度要求更高，系統(tǒng)中的干燥劑要換成XH-7或XH-9分子篩。壓縮機電機線圈絕緣材料必須加強絕緣等級，是一種不太成熟的制冷劑。</p><p style="text-indent:25px">R12為烷烴的鹵代物，學(xué)名二氟二氯甲烷，分子式為CF2Cl2。它是我國中小型制冷裝置中使用較為較廣的中壓中溫制冷劑。R12的標(biāo)準(zhǔn)蒸發(fā)溫度為－29.8℃，冷凝壓力一般為0.78～0.98MPa，凝固溫度為-155℃，單位容積標(biāo)準(zhǔn)制冷量約為288kcal/m3。R12是一種無色、透明、沒有氣味，幾乎無毒性、不燃燒、不，很安全的制冷劑。只有在空氣中容積濃度超過80%時才會使人窒息。但與明火接觸或溫度達(dá)400℃以上時，則分解出對人體有害的氣體。R12能與任意比例的潤滑油互溶且能溶解各種有機物，但其吸水性極弱。幾種制冷劑在空調(diào)中變得很普遍。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="浙江高效制冷劑,制冷劑" src="https://tyunfile.71360.com/UploadFile/bingpu/637401017472749367/5818643.png"></div><p style="text-indent:25px">認(rèn)為較有前途的R22潛代品為R407c和R410A。R407c是R32R125R134a以23：25：52的質(zhì)量百分比組成的三元非共沸制冷劑，蒸發(fā)壓力和制冷壓力與R22非常接近。但在制熱工況下單位容積制冷量和COP都小于R22。在相同設(shè)計運行能力的熱泵熱水系統(tǒng)中，采用R407c熱水加熱系統(tǒng)耗功明顯高于R22系統(tǒng)。使得在高水溫時COP低于R22系統(tǒng)。R410A是R32和R125按照50：50的質(zhì)量百分比組成的近共沸混合制冷劑。其溫度滑移不超過0.2℃，這給制冷劑充灌，設(shè)備更換提供了方便。但是R410A制熱工況下的COP比R22約小9%，其蒸發(fā)壓力，冷凝壓力以及容積制冷量都比R22大的多，同溫度下它的壓力值比R22約高60%，傳熱性能及流動性較好。不能直接用于R22系統(tǒng)。必須重新設(shè)計壓縮機，換熱器，管路和系統(tǒng)。R134a 是目前國際公認(rèn)的替代 CFC-12 的主要制冷工質(zhì)之一。低溫制冷劑多少錢</p><p style="text-indent:25px">制冷劑需較高的傳熱系數(shù)、較低的粘度及較小的密度。浙江高效制冷劑</p><p style="text-indent:25px">制冷劑需有良好的電氣絕緣性。經(jīng)濟(jì)性，要求工質(zhì)低廉，易于獲得。環(huán)保性，要求工質(zhì)的臭氧消耗潛能值（ODP）與全球變暖潛能值（GWP）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。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，在氣化或液化過程中，蒸汽成分與溶液成分始終保持相同；在既定壓力下，發(fā)生相變時對應(yīng)的溫度保持不變。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。在定壓下氣化或液化過程中，蒸汽成分與溶液成分不斷變化，對應(yīng)的溫度也不斷變化。浙江高效制冷劑</p><p style="text-indent:25px">上海冰仆冷暖設(shè)備有限公司主要經(jīng)營范圍是化工，擁有一支專業(yè)技術(shù)團(tuán)隊和良好的市場口碑。公司自成立以來，以質(zhì)量為發(fā)展，讓匠心彌散在每個細(xì)節(jié)，公司旗下制冷劑廠家直銷，冷凍油廠家直銷，壓縮機批發(fā)銷售，制冷配件批發(fā)銷售深受客戶的喜愛。公司將不斷增強企業(yè)重點競爭力，努力學(xué)習(xí)行業(yè)知識，遵守行業(yè)規(guī)范，植根于化工行業(yè)的發(fā)展。在社會各界的鼎力支持下，持續(xù)創(chuàng)新，不斷鑄造***服務(wù)體驗，為客戶成功提供堅實有力的支持。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/2533504.html</p></div></div></div></div></div><div id="g339vcz" class="page-right twoColRt"><div id="gf4h4mj" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="wvp73i2" 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(yīng)" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></div><p>福建ZF配件哪家強信息推薦自業(yè)物資供應(yīng)</p></a></div><div id="pd44df7" class="recomPic likePro"><a 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