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ID:10788465
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时间:2018-07-08
《新双管计量供热系统平均比摩阻取值问题分析论文》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、新双管计量供热系统平均比摩阻取值问题分析论文.freel摘要本文分析了新双管系统与传统双管系统的不同,提出了确定新双管系统平均比摩阻联值的方法,并通过水力计算,确定并验证了新双管系统中立管与水平支路的平均比摩阻的取值,为新双管系统水力设计计算提供参考。关键词自然循环作用压力;水力平衡;恒温阀预设值;不平衡率AbstractThispaperanalyzesthedifferencebetandtraditionalheatingsystem,putsforiningmeanfrictionresistanceofne.Throughhydrauliccalcu
2、lation,determinesandtestsmeanfrictionresistanceofriserandhorizontalbranchcircuitofne,providesreferenceforitshydraulicdesigncalculation.Keyo-staticvalve;non-balanceratio一、引言新双管系统又称双-双管系统.freel;每层水平支路散热器5组;室内系统管材为铝复合管;(2)立管为下供下回式;室内系统为异程式;设计供回水温度95℃/70℃。通过设定不同的立管和各层水平支路的平均比摩阻,来比较不同取值对
3、系统平衡的影响程度,以确定合理的平均比摩阻。在计算过程中,两者分别按下面三种情况取值;(1)立管平均比摩阻R1=≤40,≤80,≤120(Pa/m)(2)各层水平支咱平均比摩阻Rsh=≤60,≤120,≤200(Pa/m)表1水力计算结果(R1≤40Pa/m,Rsh≤Pa/m)楼层数不考虑自然循环作用每层环路阻力(Pa)考虑自然循环作用每层环路阻力(Pa)每层环路的恒温阀需要消耗眒的压差(Pa)12345每层环路的恒温阀预设值H1H2H3H4H5不平衡率(%)一层997453222291,1310,1053,639,5964,5,6,7,7三层95085476
4、3224,2467,2312,1951,19122,4,4,5,53.1五层915757453224,2467,2312,1951,19122,4,4,5,47.8七层830955173265,2508,2353,1992,19532,4,4,5,5.8九层774055683317,2559,2404,2044,20052,4,4,5,55.0十一层707655253273,2516,2361,2000,19612,4,4,5,54.9十三层673758073555,2798,2643,2282,22432,4,4,5,48.9十五层626959593707,
5、2950,2795,2434,23952,4,4,5,411.6表2不同立管平均比摩阻的水力计算结果比较(Rsh≤120Pa/m)楼层数Rt≤40Pa/mRt≤80Pa/mRt≤120Pa/m恒温阀的预设值H1H2H3H4H5不平衡率(%)恒温阀的预设值H1H2H3H4H5不平衡率(%)恒温阀的预设值H1H2H3H4H5不平衡率(%)一层4,5,6,7,7-1,2,3,4,4-1,2,2,3,2-三层2,4,4,5,53.11,2,2,4,34.61,2,2,2,217.5五层2,4,4,5,47.81,2,2,4,31.31,2,2,3,2-2.1七层2,4
6、,4,5,53.81,2,3,4,43.81,2,2,4,2-7.3九层2,4,4,5,55.01,2,3,4,41.31,2,2,4,3-11.7十一层2,4,4,5,54.91,2,3,4,41.31,2,2,4,3-19.7十三层2,4,4,5,48.91,3,4,4,412.41,2,3,4,4-16.3十五层2,4,4,5,411.61,3,4,4,410.41,3,4,4,4-5.9表3不同立管平均比摩阻的水力计算结果比较(Rsh≤60Pa/m)楼层数Rt≤40Pa/mRt≤80Pa/mRt≤120Pa/m恒温阀的预设值H1H2H3H4H5不平衡率
7、(%)恒温阀的预设值H1H2H3H4H5不平衡率(%)恒温阀的预设值H1H2H3H4H5不平衡率(%)一层4,5,6,6,7-1,2,3,4,4-1,2,2,3,2-三层3,4,4,6,52.11,2,2,4,30.21,2,2,2,213.8五层2,4,4,6,57.61,2,3,4,45.51,2,2,3,2-2.2七层2,4,4,6,52.91,2,3,4,41.11,2,2,4,3-12.1九层2,4,4,6,53.21,3,4,4,416.21,2,2,4,3-16.7十一层2,4,4,6,53.01,3,4,4,415.61,2,3,4,4-14.
8、7十三层2,4,4,6,58.91,4
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