Thermal Comfort Assessment For An Air-conditioning Train Compartment

The study on the thermal comfort comprehensive evaluate in the air-conditioning train is one important part of the modern air-conditioning train technology. It is very importment for the improvement of the living condition of the passengers and HVAC technology.Because of the solar radiation outside of the windows, the local supply of the air inlet, the hinder of the human body and the seats, makes the non-uniform of thermal environment in the train. in the non-uniform environment human's thermal comfort not only to the overall thermal sensation, but also with the local body of the thermal sensation. In summing up the impact of human factors in thermal comfort and thermal comfort evaluation methods, for the non-uniform thermal environment to take PMV method which combines the principal component analysis. From a physiological point of view, according to human skin temperature distribution of receptors, we distribute human body's model into nine parts including the face head left arm left leg left foot right ram right leg right foot and trunk. According to the flow field we can calculated various parts of the body's PMV. As part of the human body are interrelated between thermal sensations, and then use the principal component analysis method to analyze the local thermal sensation on the overall thermal sensation.Taking CRH2 train compartment as a model, using CFD software airpak to build up the mathematical physical model in accounting of solar radiation, the body's heat, the body of bulk wet breathing, the field of air temperature, velocity and relative humidity in train are offered. Then the PMV method is to evaluate the parts of the human. Through the principal component analysis method, the weight of different parts of the body is determined. So the human's thermal comfort state of each passenger is able to be investigated.The numerical method and the Comprehensive Evaluation can provide theory basis for human's thermal comfort in the non-uniform thermal environment. In addition, it can also provide the guiding significance for the designing of airflow organization in the air-conditioned room, evaluating of air quality in the room, and directing the energy-saving in construction...