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.
Xinggong Subdistrict, Dalian Xinggong Subdistrict, Dalian Xinggong Subdistrict () is a township-level division of the north of the Shahekou District of Dalian, Liaoning, China. Xinggong Subdistrict is first and always well known as Xinggong Street or Xinggong Jie () because of the important and famous street which Dalian people always call by "Xinggong Street" instead of "Xinggong Subdistrict" where Xi'an Road Commercial Zone is. Xinggong Subdistrict was also an important Japanese (Kwantung Leased Territory) machi called by where was. The area of Xinggong Subdistrict is 4 km. It has 16 villages/communities like Xingxin Community, and 256 neighborhoods/community groups. Until 2016, the population of