Mechanical engineering including mechanical and chemical engineering. At its simplest, thermodynamics is the study of energy, its use and transformation through a system. Typically, engineering thermodynamics is concerned with changing energy from one form to another. As an example, automotive engines convert chemical energy (enthalpy) from the fuel into heat, and then into mechanical work that eventually turns the wheels. Thermodynamics principles are used by mechanical engineers in the fields of heat transfer, thermofluids, and energy conversion. Mechanical engineers use thermo-science to design engines and power plants, heating, ventilation, and air-conditioning (HVAC) systems, heat exchangers, heat sinks, radiators, refrigeration, insulation, and others.
Dalian Dalian Happy Snow World in Ganjingzi District near the airport. Not many people ride bicycles in Dalian because of the hilly roads. Dalian is also one of the many cities in China where there are few motorcycles, because motorcycle riding on most roads is banned by law. The city has a comprehensive bus system and an efficient metro system. As of November 2015, the Dalian Metro consists of the underground Line 1, Line 2, and the overground Line 12 (Formerly called line R2) and Line 3. New lines and expansion of the metro system are under way. The Dalian Tram