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双螺旋循环流体换热系统及其结构参数分析
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Abstract:
针对循环流体换热系统的温度场不均匀和融雪效果不佳等问题，提出一种新型的布管形式——双螺旋布管。基于典型工程案例，构建循环流体换热系统的精细化三维有限元数值分析模型，揭示其温度场分布特征和融雪化冰过程特征，验证双螺旋循环流体换热系统的优越性，确定其主要结构参数对运行性能的影响。结果显示：相对于常用的曲流式布管和蛇式布管，双螺旋循环流体换热系统的温度场更均匀、能耗更低、效率更高、效果更佳，其换热功率分别降低3.21%和12.35%，融雪面积比分别提升2.16%和22.91%；随着布管深度的增加和换热管尺寸的减小，其能耗、效果和效率等都显著提升；随着布管间距的增大，能耗、效果和效率都是先提升后降低。结果表明，双螺旋循环流体换热系统是一种更加高效的换热系统。
A new tube arrangement pattern—double spiral tube arrangement was proposed to overcome problems such as temperature field non-uniformity and bad snow melting performance in circulating fluid heat exchange system (CFHEX). Fine 3-dimensional finite element numerical simulation models of CFHEX were built based on typical engineering case, temperature field distribution characteristics and snow-ice melting course were analyzed, superiority of double spiral CFHEX was verified, influence of its primary structure parameters to operating performance was ascertained. Results shown: compared with traditional mender flow tube arrangement and snail tube arrangement pattern, temperature field of new double spiral CFHEX is more uniform, energy consumption is lower, efficiency is higher, effectiveness is better; its heat exchange power reduces 3.21% and 12.35 respectively, melting-snow ratio raises by 2.16% and 22.91% respectively; with decrease of tube depth and size of heat exchange tube, its energy consumption, effectiveness and efficiency all raise; with increase of tube spacing, energy consumption, effectiveness and efficiency raise firstly and then reduce. Findings indicate that new double spiral CFHEX is a more efficient heat exchange system.
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