The insulation performance is one of the important indices of thermal performance of the insulated car and the heat transfer coefficient is a main parameter to measure the insulation performance.To accurately measure the insulation performance of the insulated car,the article introduces two methods to measure the heat transfer coefficient K value which are the thermal stability method and the non-thermal stability method.A certain new type of railway insulated car has been studied by K value contrast test with the thermal stability method and the non-thermal stability method:the K value of the new railway insulated car measured with the thermal stability method is 0.193 4 W/(m2·K),the K value measured in laboratory with the non-thermal stability method is 0.193 2 W/(m2·K),with a relative error of 0.10%compared with the K value with the thermal stability method;the K value measured in workshop with the non-thermal stability method is 0.204 1 W/(m2·K),with a relative error of 5.53%compared with the K value with the thermal stability method.Therefore,compared with the thermal stability method,a relatively accurate test result can be obtained in a laboratory with constant temperature with the mon-thermal stability method.The K value of the new type of insulated car has been measured with different test methods,providing a reference for the future development of the new types of railway insulated cars of China.
insulated carthermal stability methodnon-thermal stability methodK valueheat transfer coefficient
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