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更新時(shí)間：2025.05.31
多層住宅太陽能熱水管敷設(shè)方式探討

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分析了規(guī)范住宅太陽能熱水器管道與建筑一體化設(shè)計(jì)和安裝的重要性,探討了多層住宅太陽能熱水管敷設(shè)方式,指出集中穿管敷設(shè)具有經(jīng)濟(jì)、美觀、安全、易施工和維修方便等許多優(yōu)點(diǎn),值得推廣。

熱水管材用乙烯-丙烯無規(guī)共聚樹脂的結(jié)構(gòu)表征

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Two commercial ethylene-propylene random copolymers(A and B) for hot water piping of which A has better long term heat stability and slow crack growth resistance performance than B were fractionated with respect to the isotactity distribution by preparative temperature-rising elution fractionation(TREF).The molecular weight and distribution of fractions and the original resins were investigated by gel permeation chromatography.The results indicated that both A and B had broad isotacticity distribution and A had fewer portions of high isotacticity than B.At the same time A had broader and more typical double-peak molecular weight distribution.The fractions of A had higher molecular weight and broader molecular weight distribution than those of B's.All of these results implied the differences between the catalysts or the polymerization processes for the two copolymers.

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