The Research Of Heating Energy-saving Optimization Of Bridge Load Air Conditioning Based On Thermal Comfort

With the development of social science and technology and the improvement of people’s living standards,more people prefer to travel by plane.Under the premise of paying to its fast and safe,people put forward higher requirements on the thermal comfort of the aircraft cabin,energy saving and environmental protection.All airports in China actively responded to the requirements of CACC(the Civil Aviation Administration of China),that promote the use of bridge load air conditioning to replace airborne air conditioning when the aircraft stops at the corridor bridge,which not only improves the thermal comfort environment but also achieves the goal of energy-saving and emission-reduction.However,due to the complex and changeable external environment and the single control of bridge load air conditioning products,the effect of adjusting the environment is not good in practical operation.At present,there are few studies on airflow distribution inside cabin with bridge load air conditioning,and most of them focus on the cooling condition in summer.While there are few studies and analyses on the influence of thermal stratification,poor thermal comfort and low heating efficiency inside cabin under the heating condition of bridge load air conditioning in winter.Based on the economic cabin of Boeing 737 as the research object,the physical model and mathematical model of the cabin are established by using CFD method.The validation of model and CFD method are verified on the simulated cabin experiment platform that built as same as size of the real aircraft.Through three-dimensional transient numerical simulation of air flow inside cabin under the heating condition of bridge load air conditioning in winter,the influence of different air supply velocity on the distribution of velocity and temperature fields inside the cabin is obtained.According to the parameter values of the sampling points in the simulation results,the non-uniformity coefficient,PMV-PPD index and EUC index are used to evaluate and analyze the distribution of airflow organization,thermal comfort and efficiency of energy utilization in the cabin.The corresponding formula and the appropriate range of velocity is obtained through the curve fitting.Finally the new evaluation function is constructed based on PPD and EUC,the optimal air supply velocity with better thermal comfort and higher energy utilization efficiency is determined,which provide reference for the practical operation and energy-saving optimization control of bridge load air conditioning.