单相泵驱流体回路不同拓扑结构的散热性能分析

Analysis of heat dissipation performance in different topologies of mechanically pumped single-phase fluid loop

基于单相泵驱流体回路,研究了系统在不同拓扑结构下的控温性能。采用集总参数法建立了流量计算及分配模型、流体与设备换热模型、混合点温度计算模型以及热流计算模型,并运用Openmodelica仿真平台,开展了不同拓扑结构对设备温度、系统流量和系统出口工质温度的影响分析,探究了不同载荷占空下设备散热效果、系统峰值损耗和内能变化等的动态特性。结果表明,一方面,并联拓扑体系设备散热及均温效果较好;另一方面,热惯性对系统内能变化影响较大,在系统热惯性一定的条件下,载荷占空比越大工质冷却响应时间越大,系统能量损失越小。

Based on the pump drive single-phase fluid loop,the heat dissipation performances of different topologies were studied.The flow calculating and distribution model,heat transfer model,mixing point temperature model and heat flow calculating model werc cstablished using the lumped parameter method.The influence of different topologies on the system flow,outlet temperature and equipment temperature were analyzed,and the dynamic characteristics of system heat dissipation,peak loss and internal energy variation were discussed.The results indicate that the parallel topological system has a better temperature control capability compared with the system in series or in mixing connection.The thermal inertia has great effect on the system inner energy,and with the same system thermal inertia,the cooling response time becomes longer and the energy loss gets less when the heat load duty ratio increases.