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PLC企業(yè)資訊
    6EP1332-1SH52
    發(fā)布者:gw0002  發(fā)布時(shí)間:2018-08-29 15:05:45

    6EP1332-1SH52

    6EP1332-1SH52

    6EP1332-1SH52

    _________________________________________ 
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    在中央空調(diào)系統(tǒng)設(shè)計(jì)中,冷凍泵、冷卻泵的裝機(jī)容量是取系統(tǒng)最大負(fù)荷再增加10%—20%余量作為設(shè)計(jì)系數(shù)。根據(jù)計(jì)算中央空調(diào)系統(tǒng)中,冷凍水、冷卻水循環(huán)用電約占夏季酒店總用電的25%—30%,冷卻塔的用電占8%—10%。因此,實(shí)施對(duì)冷凍水和冷卻水循環(huán)系統(tǒng)以及冷卻塔的能量自動(dòng)控制是中央空調(diào)系統(tǒng)節(jié)能改造及自動(dòng)控制的重要組成部分。
     2、泵的轉(zhuǎn)速調(diào)節(jié)
    根據(jù)異步電動(dòng)機(jī)原理n=60f/p(1-s)式中:n:轉(zhuǎn)速 f:頻率 p:電機(jī)磁極對(duì)數(shù) s:轉(zhuǎn)差率
    由上式可見(jiàn),調(diào)節(jié)轉(zhuǎn)速有3種方法,改變頻率、改變電機(jī)磁極對(duì)數(shù)、改變轉(zhuǎn)差率。在以上調(diào)速方法中,變頻調(diào)速性能最好,調(diào)速范圍大,靜態(tài)穩(wěn)定性好,運(yùn)行效率高。因此改變頻率而改變轉(zhuǎn)速的方法最方便有效。
     3、冷卻塔的控制
    以前的冷卻塔是人為的根據(jù)冷卻水溫度選擇冷卻塔開(kāi)啟的臺(tái)數(shù),非常容易造成能源的浪費(fèi)現(xiàn)象,現(xiàn)在根據(jù)冷卻水的溫度,由溫度傳感器傳送信號(hào)至PLC,由PLC經(jīng)計(jì)算后對(duì)冷卻塔風(fēng)機(jī)依次開(kāi)啟,以28℃為基數(shù),溫度每上升2℃,開(kāi)啟兩臺(tái)散熱風(fēng)機(jī),每下降2℃,延時(shí)5分鐘后停止2臺(tái)風(fēng)機(jī),以達(dá)到節(jié)能效果。

    節(jié)能改造的具體方案
      1、主電路的控制設(shè)計(jì)
      根據(jù)具體情況,同時(shí)考慮到成本控制,原有的電器設(shè)備盡可能的利用。冷凍水泵及冷卻水泵均采用一用一備的方式運(yùn)行,使用一臺(tái)變頻器控制拖動(dòng)兩臺(tái)水泵交替運(yùn)行。將一臺(tái)揚(yáng)程較高的冷水泵作為備用。
    以下為冷凍水泵與冷卻水泵一次接線圖:
     2、功能控制方式
    工作流程:
      開(kāi)機(jī):開(kāi)啟冷水及冷卻水泵,由PLC控制冷水及冷卻水泵的啟停,由冷水及冷卻水泵的接觸器向制冷機(jī)發(fā)出聯(lián)鎖信號(hào),開(kāi)啟制冷機(jī),由變頻器、溫度傳感器、溫度模塊組成的溫差閉環(huán)控制電路對(duì)水泵進(jìn)行調(diào)速以控制工作流量,同時(shí)PLC控制冷卻塔根據(jù)溫度傳感器信號(hào)自動(dòng)選擇開(kāi)啟臺(tái)數(shù)。
      停機(jī):關(guān)閉制冷機(jī),冷水及冷卻水泵以及冷卻塔延時(shí)十分鐘后自動(dòng)關(guān)閉。
      保護(hù):由壓力傳感器控制冷水及冷卻水的缺水保護(hù),壓力偏低時(shí)自動(dòng)開(kāi)啟補(bǔ)水泵補(bǔ)水。

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