Trade data-driven portfolio management

New title: From air cooling to water cooling heat dissipation: the cooling process of automobile engines The Trade data-driven portfolio managementheat dissipation system of automobile engines is an important part of ensuring its normal operation and life.With the continuous development of technology, the heat dissipation mode of the engine has also changed differently. The two main methods are air cooling and water cooling heat dissipation. This article mainly describes the evolution of automobile engines from air cooling to water cooling and heat dissipation. I. Air-cooled engine Air-cooled engine, as the name implies, is an engine that dissipates heat through air. Air-cooled engines first appeared during World War II and were widely used in military and aviation fields. Its advantages are simple structure, high reliability, easy maintenance, and will improve the heat dissipation efficiency with the increase of the engine running speed. However, the air-cooled engine also has its shortcomings. The biggest problem is that the heat dissipation effect is not ideal. Air-cooled engines need to maintain normal working temperature when running at high speeds, and are prone to heat or even serious damage when running at low speed.In addition, because the engine temperature is difficult to control, it will lead to unstable emissions, which is not conducive to environmental protection. II. Water-cooled heat dissipation engine Water-cooled heat dissipation engine first appeared in the 1920s, but the technical level and material conditions at that time did not allow it to be widely used. With the progress of materials science and manufacturing technology, water-cooled engines have gradually become the mainstream. Nowadays, almost all car and motorcycle engines use water-cooled heat dissipation systems. The basic principle of the water-cooled heat dissipation engine is to use water to take away the heat inside the engine, and then return to the engine cycle after the radiator cools down to maintain the normal operating temperature of the engine. Compared with air-cooled engines, water-cooled heat dissipation engines can maintain a relatively stable working temperature in various working conditions, improving combustion efficiency and engine life. At the same time, the emissions of water-cooled engines are more stable and more environmentally friendly.III. Advantages of water-cooled heat-dissipation engines Compared with air-cooled engines, water-cooled heat-dissipation engines have the following advantages: 1. The water-cooled heat dissipation engine with higher heat dissipation efficiency adopts liquid circulation heat dissipation, which can more effectively take away the heat inside the engine, so that the engine can maintain a relatively stable working temperature in different working conditions and extend the service life of the engine. Two. The water-cooled engine is more environmentally friendly and has less impact on the environment. Compared with air-cooled engines, water-cooled engines can control the temperature more stably, making the engine burn more fully and the emissions more environmentally friendly. 3. Driving comfort is higher. The water-cooled engine has good heat dissipation effect, which can maintain the normal operation of the engine under high temperature conditions, and reduce engine noise, abnormal noise and other problems to improve the driver's comfort. IV. Summarize that the cooling mode of automobile engines has evolved from air cooling to water cooling and heat dissipation.With the progress of materials science and manufacturing technology, water-cooled heat dissipation engines have gradually become the mainstream. Compared with air-cooled engines, water-cooled heat-dissipation engines have superior characteristics in terms of heat dissipation efficiency, environmental protection and driving comfort, which is the future development direction of engines.

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