Automotive Air Conditioning Anti - Conditioning Analysis

Now most cars have air conditioning systems, not only improves the comfort of the car, but also improves the safety performance of the car. When designing a car air conditioning system, many factors need to consider: The wind speed of the passenger head in the passenger cabin should be uniform, stable, and the airflow flow rate is generally stable between 0.15 to 0.40m / s; for the driver side of the instrument panel The amount of air volume should be slightly larger than the one-pilot side, about 52% of the total air volume; at the same time, the speed difference between the wind should not exceed 2m / s, otherwise the thermometer in the occupant will appear, the speed field is not Uniform, a vortex is not conducive to the vehicle's air update. Among them, the air-conditioning air-conditioning airway is one of the important components in the automotive air conditioning system, and its design level directly affects the rationality of air flow tissue in the car, which affects the hot comfort of the occupant. The air conditioning flap is analyzed, and the design is reasonable to evaluate the design of the air conditioning system, which is very important for improving the hot comfort of the occupant.

Currently, with the rapid development of computer and numerical technology, CFD simulation analysis is carried out by the flow of airflow in the air conditioning air, and improves improving measures are proposed. There are also many studies on the use of CFD methods to perform passenger comfort. In 2007, Hua Changhong, Jianghuai Motor Company, Liu Jiangbo et al 3 used CFD method to analyze the export flow distribution of a light card cab defendant, and improved the wind structure. In 2008, Wu Jinyu, Shanghai Jiaotong University, Chen Jiangping 4 In the case of the CFD analysis of HVAC (HVAC) and the inner field in the air, the influence of the internal structure of the wind turbine on the distribution and air supply volume, and proposed ways to improve. Document 5 analyzes the flow of the HVAC inner gas using CFD, and considers three modes: blowing surface mode, defrost mode, and blowing foot mode. In 2010, Jianghuai Auto Company's Tao Ming, Xu Yao, etc. It is reasonable for all air-speaking branches. In 2011, Yang Guoping, Shanghai University of Engineering 7 established a certain car airway model with the CFD method, and improved the uniformity of the exhaust port by improving the performance of the central airway. However, in the predecessors, most of the air-conditioning air-conditioning system is improved, most of which is structural improvements to the air-duct system, and do not consider the entire air conditioning system when simulating the thermal comfort of the passenger cabin. . Based on this, in the text, 40 sample points were selected by the experimental design of the DOE (Designofexperiment) method, and the three-order response surface model was established, and then the response surface model was optimized using the genetic algorithm. As a whole, the air conditioning system and the occupant are added, and the driver model is added, and consider the thermal comfort of the passenger compartment.