隨著建筑公用設施的(de)投放比例加大，使(shi)越(yue)來越(yue)多的(de)管(guan)道(dao)(dao)暴露在外(wai)。中(zhong)國(guo)北方大部分地區一(yi)到冬季，氣(qi)溫將(jiang)達到零度以下。在寒冷的(de)冬季，如果(guo)沒(mei)有(you)進行防凍保溫的(de)消(xiao)防管(guan)道(dao)(dao)常常被凍結(jie)，一(yi)旦產生(sheng)火警(jing)，消(xiao)防管(guan)道(dao)(dao)將(jiang)無法實(shi)時利用，這將(jiang)會對整個修建的(de)寧靜性構成(cheng)了極大的(de)隱患。消(xiao)防管(guan)道(dao)(dao)電伴熱技術在維持管(guan)道(dao)(dao)中(zhong)的(de)水(shui)不(bu)會在冬天產生(sheng)凍結(jie)中(zhong)發揮越(yue)來越(yue)重(zhong)要(yao)的(de)作用。
消(xiao)防管(guan)(guan)(guan)(guan)(guan)道中鋪(pu)設(she)電(dian)(dian)(dian)(dian)伴(ban)熱(re)(re)帶可以避免由于(yu)(yu)管(guan)(guan)(guan)(guan)(guan)道凍結而(er)影響(xiang)管(guan)(guan)(guan)(guan)(guan)網運行。鋪(pu)設(she)了電(dian)(dian)(dian)(dian)熱(re)(re)帶的(de)管(guan)(guan)(guan)(guan)(guan)材，規模尺寸結構(gou)完全(quan)與(yu)普通(tong)(tong)保溫(wen)(wen)管(guan)(guan)(guan)(guan)(guan)相同，利用電(dian)(dian)(dian)(dian)熱(re)(re)帶通(tong)(tong)過(guo)鋼管(guan)(guan)(guan)(guan)(guan)加熱(re)(re)介質。剛通(tong)(tong)電(dian)(dian)(dian)(dian)瞬(shun)間(jian)電(dian)(dian)(dian)(dian)伴(ban)熱(re)(re)帶發(fa)熱(re)(re)功率***大(da)隨著(zhu)溫(wen)(wen)度(du)升高，電(dian)(dian)(dian)(dian)纜中PTC記憶材料(liao)電(dian)(dian)(dian)(dian)阻逐漸增大(da)，所以工(gong)作電(dian)(dian)(dian)(dian)流和(he)電(dian)(dian)(dian)(dian)熱(re)(re)功率也(ye)會逐漸減小，直(zhi)至電(dian)(dian)(dian)(dian)伴(ban)熱(re)(re)發(fa)熱(re)(re)功率補(bu)(bu)償(chang)系統(tong)的(de)熱(re)(re)損失，使(shi)系統(tong)溫(wen)(wen)度(du)處于(yu)(yu)穩定狀(zhuang)態時停止。當(dang)環境溫(wen)(wen)度(du)降低(di)是系統(tong)溫(wen)(wen)度(du)又(you)降低(di)趨勢的(de)時候，電(dian)(dian)(dian)(dian)纜功率自(zi)動增大(da)，自(zi)動補(bu)(bu)償(chang)熱(re)(re)損失，使(shi)系統(tong)在新的(de)溫(wen)(wen)度(du)下處于(yu)(yu)平衡，這種補(bu)(bu)償(chang)加熱(re)(re)方式有效節能。
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