Study on Measurement of Heat Transfer Coefficient of New Type of Railway Insulated Car
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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