“The rapid development of new energy vehicles puts forward new requirements for automotive air-conditioning systems, and at the same time it will trigger new technological changes.” Professor Chen Jiangping of Shanghai Jiaotong University’s School of Machinery and Power has recently held a ninth Gleneagles technical seminar. Will be interviewed by reporters, said the impact of consumption upgrades and energy-saving emission reduction "entrance" will also force automotive air-conditioning technology to continuously improve efficiency to meet the market needs.
At present, high-efficiency air conditioning systems are the focus of work in the automotive air-conditioning industry. Entrusted by the Ministry of Industry and Information Technology, the Auto Air Conditioning Committee of the China Association of Automobile Manufacturers has been actively promoting the "Efficient Air Conditioning Reward Program" and hopes to encourage the use of advanced technology by the entire vehicle company through incentives. Recently, Xue Qingfeng, secretary-general of the Automotive Industry Air-Conditioning Committee of the China Association of Automobile Manufacturers, told reporters: “The relevant drafts are currently being revised and are yet to be released.” It can be seen that the development trend of China's auto air-conditioning technology will be in the future with high efficiency, light weight, and meeting the demand for new energy vehicles. .
■ The new solutions ready to come <br> <br> automotive air conditioner market changes taking place, it will affect the evolution of technology and performance. An expert in charge of air conditioning design for a vehicle company pointed out in an interview that the first is that consumer demand for personalization is increasing day by day, such as faster cooling in the summer and more comfortable and smarter air conditioning systems in winter. The second is to increase the attention to the air quality in the car and put forward new requirements for the design of the air conditioning system. Third, the pressure of energy conservation and emission reduction has prompted auto companies to develop and promote efficient air conditioning technology. Experts in the Air Conditioning Group at the Geely Automobile Research Institute also believe that with the increase in pressure for energy conservation and emission reduction, companies are gradually realizing a shift from improving performance to improving efficiency, that is, without increasing or even reducing power consumption and weight, they will Improve performance.
"New energy vehicles running, air conditioning not only to provide comfort, but also affect the distribution of mileage and power problems." Chen Jiangping told reporters that the automotive air conditioning system is facing new technological changes and challenges, which involves the key components For example, the structural optimization of compressors, condensers, etc., further improvement of process design, reliability of material applications, etc., all of which require companies to quickly adjust and actively respond. In the absence of an engine, the heating method changes, and the condenser required for a pure electric vehicle needs to be redesigned. The idea and concept are completely different. In addition, under the trend of lightweight and miniaturization, how the condenser process will be changed, how its performance will be guaranteed, and how the efficiency will be further improved are issues that companies are facing or will face.
Regardless of the realization of efficient air conditioning, light weight, or the application of electric vehicles, companies are constantly driven to change their existing technologies and processes or adopt new solutions. Xu Hang, chief engineer of Yuxin Automotive Air Conditioning Co., Ltd., an automotive air-conditioner manufacturer, said: “Efficiency is also a goal pursued by the automotive air-conditioning industry, and we are also investing more in efficient air-conditioning technology research and development.”
■ Condenser technology upgrade space "Condenser has a greater impact on the efficiency of automotive air conditioning, and its space for improvement through efficiency is also relatively large." Chen Jiangping thinks so.
Geely Automobile's air-conditioning experts explained: "The main energy consumption of automotive air conditioners is on compressors. Compressors have a lot of performance curves just like engines, and pressure ratios of 4 to 6 are usually the best (good performance and low power consumption). The condenser and the cooling fan are mainly responsible for determining the normal working pressure for the air conditioning system. If the condenser design is good, it will maintain the normal suction and exhaust pressure of the compressor, allowing the compressor to work in an efficient performance range, thereby reducing the Power consumption: The quality of the condenser directly affects its contribution to the energy saving and consumption reduction of automotive air conditioners."
Related personnel of Shanghai Aishidak Auto Air Conditioning System Co., Ltd. expressed that the key technologies currently involved in the condenser are mainly the design optimization of the flat tube and fin structure, the welding technology and the development of the material system to ensure the reliability and use of the welding process. The corrosion resistance. The key to judging the quality of the condenser depends mainly on its heat transfer performance per unit area, ventilation effect, reliability, durability, and corrosion resistance of the material system.
Relevant personages of John Ang Auto Parts (Shanghai) Co., Ltd. expressed that the greater the core size of the condenser, the larger the larger the heat exchange area of the core, the greater the impact on the performance of the air conditioning system. He explained that refrigerant pressure drop and air pressure drop are also the main parameters of the condenser, which is related to the angles of the refrigerant flow channels and the heat sinks of the various components of the condenser core. In addition, the quality of the material has a great influence on the heat exchange capacity and strength of the condenser. In the design of key technologies, the condenser is mainly based on the overcooling design. The advantage of this design is that the refrigerant in the imported gas is converted into liquid to the outlet after passing through the condenser heat exchange, which indirectly enhances the heat transfer of the evaporator. performance.
Although the condenser technology and manufacturing level are very mature, there is still much room for improvement. The first is to reduce costs. “The current technical difficulty is how to build high-performance cores at low cost. This requires companies to start with the details of materials, design processes, manufacturing, and other aspects,” said Zheng Jianshan, an engineer at Mulle Belle. The second is material weight loss. Under the premise of guaranteeing the performance requirements, the weight of the material is reduced as much as possible, so that it becomes possible to apply the composite multilayer material to the flat tube, and the reliability of the welding and the corrosion resistance of the condenser are improved. The third is the improvement of the manufacturing process. At present, the condenser design and manufacturing process is continuously improving and upgrading, such as folding tube forming and manufacturing technology, which will be a major technology trend in the future. In addition, the condenser design can be further compact, lightweight, optimize the internal structure of the flat tube, and optimize the window geometry of the fins.
Shenyang Zhongda Huanxin Refrigeration Technology Co., Ltd.
