| With the rapid development of China’s high-speed railway and subway, train service throughout the entire process of EMU service, including the use and storage procedure is to protect the safe operation of the train. By Subway Train Maintenance and repair database repository site investigation found that due to the worker cooling, cooling equipment, cooling and maintenance of the vehicle itself, plus the library the safe side is not set mechanical ventilation, when higher temperatures in summer, workers jobs environment is more severe, affecting workers’ job security and service quality. Train maintenance base larger, fewer and dispersed workers, the use of the whole air-conditioning system, the system large, high energy consumption; less for mobile air-conditioning maintenance library research, with its large air-conditioned office stations gap; and common air conditioning is generally in accordance with the standard test conditions for the design, maintenance library mobile air-conditioning condensing unit inlet air temperature and the evaporation temperature of the inlet air temperatures are in the library, so the need to design the actual usage of the air conditioner according to overhaul library.By railway and subway maintenance overhaul library library site investigation, and existing thermal comfort index PMV-PPD comparative selection as thermal comfort standard library maintenance workers, obtained by calculating the area of air operations to meet the requirements of the PMV-PPD parameter factors analysis PMV-PPD and found that the maximum wind speed of PMV, followed by temperature, and relative humidity on the PMV minimum. Comparison of different thermal comfort levels, combined with local air supply parameters ultimately determine air parameters worker operation area.EnergyPlus software to establish the use of the library over the maintenance model, obtained by the simulation of different regions of the country overhaul library of natural ventilation air temperature, namely mobile air-conditioning inlet air parameters. Combined with field survey results, the platform operations and ground handling unit designed separately, based around the inlet parameters binned for mobile air conditioning unit, the unit is divided into two kinds of 28℃,31℃,33℃,35℃ fourth gear design. According to natural ventilation around the library maintenance and operation area air temperature parameter calculated using the formula of the local air jet thrust reversers to give mobile air supply parameters, and calculates the stall unit load.Design 33℃ categories ground handling mobile air-conditioning units, and the use of LMS AMESim software to build mobile air conditioning and refrigeration systems model to analyze the inlet air temperature, air volume change, the capillary length change, evaporator size changes, condenser size change on mobile the impact of air conditioning evaporator air temperature, cooling capacity and COP of the unit.Use LMS AMESim software integrated influence of each parameter change on the performance of mobile air-conditioning, refrigeration units and integrated coefficient COP and factory production costs were on the ground and work platforms work units were optimized to obtain various types of unit parameters. Completed using the optimized parameter 33℃ category of mobile air-conditioning design and production, as well as the unit found in the Guangzhou area. Numerical simulation and experimental results comparison unit, the error is within 5%, again verify the accuracy of the LMS AMESim air conditioning and refrigeration system model parameters to guide the design of other units available optimized. |
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