Many buses use cryogenic container to store the LNG as fuel. The heat insulated performance is an important parameter that reflected with daily evaporation rate or heat leakage of cryogenic container. In bus running process, the LNG container is affected by many factors and difficult to assess and analyze the heat insulated performance. In order to solve this problem, firstly, according to the LNG container heat leakage transfer process in bus running, the energy equations of the LNG were established. Secondly, the factors were analyzed that affected the heat insulated of the LNG cryogenic container. Then, the heat leakage was calculated depending on the test data of the LNG container in the bus running to estimate the heat insulated performance. At the same time, the LNG container heat insulated performance was also measured at the local inspection agency. We found that there were great differences between the two results, and the reasons for the great differences were further analyzed.

许多公共汽车使用低温容器来存储液化天然气作为燃料。绝热性能是一个重要的参数，它反映了低温容器的日蒸发率或热泄漏。在公交车运行过程中，LNG集装箱受多种因素影响，难以评估和分析其隔热性能。为了解决这个问题，首先，根据公交车运行中LNG容器的热泄漏传递过程，建立了LNG的能量方程。其次，分析了影响LNG低温容器隔热的因素。然后，根据公共汽车行驶中的LNG容器的测试数据计算出热泄漏，以估计隔热性能。同时，LNG容器的隔热性能也在当地检查机构进行了测量。我们发现这两个结果之间存在很大的差异，并且进一步分析了产生巨大差异的原因。