Study On The Simulation And Control Of Airflow In Passenger Compartment Based On Air-conditioning Parameters

Vehicles have become necessities in daily life. The requirements for the comfort aregradually improved, and it is expected to achieve this goal with less energy consumption.Flow field of passenger compartment and temperature distribution can determine the level ofcomfort and Air-conditioning energy consumption in different environments. Reasonabledesign on air parameters can effectively improve the vehicle interior flow field. Therefore, astudy of effects of air parameters on flow field in passenger compartment and air conditioningcontrol with the low power and high comfort has a very important significance.Current research methods for the vehicle interior flow field of passenger compartmentmainly include experiment and numerical simulation. Experiment is limited on environmentalconditions, whose implements are very difficult to give. Numerical simulation method can notonly achieve flow field information quickly, but also can simulate the velocity andtemperature distribution of passenger compartment under any environmental conditions,which further analyze effects of air parameters on the passenger compartment air flow field.In this paper, a car interior model with a ratio of1:1was simplified. Realizable k-eturbulence model and TCM human body heat regulation model were chosen with a reasonableset of solar radiation boundary, then air temperature, air velocity and air angle parameterswere simulated under twelve working conditions. Combined with the overall thermal comfortindex deviation AEQT, cooling load P, velocity field and temperature field distribution, effectlaw of different air parameters on car interior flow field was studied on a point of comfort andenergy efficiency.Under typical summer operating conditions, using an approximate optimization method,air parameters of air thermal comfort control and conventional temperature control with theequal comfort requirements were simulated and calculated. It can be seen that comfort controlwas a more energy-efficient method which made human body maintain a stable level of comfort in one day. Then comfort requirements were enhanced for optimum comfort controlsimulation. With the improvement of comfort requirements, energy consumption hasincreased, but which still were lower than the energy consumption of traditional temperaturecontrol, and thermal comfort has been improved greatly.This paper summarizes numerical simulation method of car interior flow field andthermal comfort evaluation, and studies effects of air parameters, which enriches the study ofcrew compartment flow field numerical simulation. In addition, air parameter controlstrategies on improving comfort effectively taking saving energy into account are proposed.