Analysis on the unsteady heat transfer of the compartment enclosure of the air-conditioned train in qinghai-tibet railway

作者：Wang Ye^*; Wang Liangbi; Lin Zhimin; Dong Meirong

来源：China Railway Science, 2009, 30(4): 81-85.

• Air temperature
• Airconditioning systems
• Calculation methods
• Climate condition
• Compartment enclosure
• Control precision
• Cooling load
• Energy consumption
• Environmental parameter
• Heat transfer calculations
• Heating energy consumption
• Highest temperature
• Original design
• Outer surface
• Qinghai-Tibet Railway
• Refrigeration system
• Running conditions
• Running train
• Thermal stability
• Unsteady heat transfer
• Unsteady heat transfer analysis

Based on the special climate conditions of Qinghai-Tibet Railway and the thermal stability of the enclosure of running train compartment, unsteady theory in program compiled for the study was adopted to calculate the inner and outer parameters and the heat transfer through the enclosure of train compartment. Moreover, the quantity of unsteady heat transfer was compared with that using steady method based on different outer calculating temperatures. In Qinghai-Tibet Railway, the outer surface synthesis air temperature of the compartment enclosure is affected remarkably by solar radiation. But also, there are very distinct characteristics for outer surface synthesis air temperature curves of the compartment enclosure of different trains which run towards opposite direction, which is mainly resulted from different intensity of solar radiation accepted by different parts of the train at different times. In most sections of Qinghai-Tibet Railway, in terms of heat transfer quantity of compartment enclosure, values obtained by unsteady heat transfer calculation method are higher than those by steady heat transfer calculation method under the same calculation condition. It shows that the cooling load of the compartment enclosure using steady method based on the highest temperature of the designing day in the original design is relatively lower. Although it is beneficial to energy conservation of air-conditioning, the heating energy consumption is therefore increased. Analysis on the heat transfer of compartment enclosure using unsteady calculation method can provide more concrete and accurate data for adjusting the running condition of air-conditioning and refrigeration systems, modifying the cooperation modes between the oxygen system and the air-conditioning system, improving the control precision of the inner environmental parameters and reasonably evaluating the energy consumption of the train in Qinghai-Tibet Railway.

• 出版日期2009