车载局域环境温控装置的热分析及热测试方法

Thermal analysis and test methods for local environment temperature control in-vehicle apparatus

针对车载局域环境温控系统的个性化设计及评估调试问题,结合一种基于密闭风冷换热方式的车载局域温控装置的物理结构及内部温度测点分布,对其传热过程进行了分析,并建立了系统的热阻网络分析模型。推导了系统内部温度节点在稳态导热和非稳态导热情况下的变化规律。通过选择不同的加热功率及加热方式对车载局域温控装置进行实验测试,结合推导出的变化规律对测试数据进行拟合处理,获得了系统温度节点之间的传热系数及热容参数。所测参数之间的相对误差约在0.6%～6%,表明所建立的系统数学模型及测试方法可用于指导车载仪器温控系统的设计及快速调试。

Abstract： Aiming at the problem of individual design, evaluation and commissioning in local environment temperature con- trol in-vehicle system,and considering the physical structure and temperature sensor distribution of a sealed air cooling constant temperature control in-vehicle apparatus, the heat transfer property of the apparatus was analyzed, and the system thermal resistance network model was established. The changing laws of the system temperature nodes were derived under steady-state and unsteady-state heat conductions. The local temperature control in-vehicle apparatus was tested when dif- ferent heating powers and heating styles were selected,the test data was fitted according to the derived laws,and the heat transfer coefficients and heat capacity parameters among the system temperature nodes were obtained. The relative errors of the measured parameters are about 0.6% to 6% ,which indicates that the established mathematical model and test method can be used to guide the design and fast commissioning of the in-vehicle instrument temperature control system.