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 Metro Dalian Metro The Dalian Metro or Dalian Subway is a rapid transit system in the city of Dalian, Liaoning, China. The metro opened on 1 May 2003. The system currently in operation consists of 4 lines: Line 1, Line 2, Line 3, and Line 12. Line 1, opened in 2015 currently in operation, connects east southeast central Dalian with north Dalian. The total length is 28.34 kilometers, with 22 underground stations. Line 2, opened in 2015 currently in operation, connects east central Dalian with west central Dalian. The total length is 42.56 kilometers, with 29 underground stations. The line is