Rapid test method for evaluation of thermo-technical condition of non-traction rolling stock car bodies

Reduction of energy use and polluting emissions of engines and is one of the challenges for ecological balance.For achieving optimal power-to-weight ratio of railway transport, rapidly developing special vehicles (SVs) equipped with power generating systems are considered as ambitious ones. SVs include refrigerator, passenger, and multiple unit cars.Optimization of energy consumed by SVs’ heating and climatic installations helps minimize polluting emissions.Variable-speed drive, energy saving additives are commonly used to reduce energy consumption.However, expected results can be achieved only by compliance of SVs’ car bodies to the thermotechnical standards, regular checks of total heat transfer coefficient К (W/m۲ К) by thermo-technical tests.Equilibrium method is internationally used for that: SVs are placed into homoeothermic environment, and their car bodies are heated from the inside by thermal source of certain capacity to the moment when air temperature stops rising and remains stable. Obtained air derivative represents equilibrium thermal condition; then K value is calculated.However, tests for calculation of K value are labor and time consuming and imply more ۷۲ idle hours for tested SVs.A non-equilibrium method as faster process is proposed, which is calculation of K using the data obtained after first ۱۱ hours of tests.Air heating process comprises irregular and regular phases. Difference between the two is in the heating rate behavior.During the initial period, temperature ratio change pace dθ/dτ goes in accordance with equation:

کلیدواژه ها:

total heat transfer coefficient thermo-technical tests ، test facilites ، energy optimization