Energy transfer can be considered for the special case of systems which are closed to transfers of matter.

Beyond the constraints of closed systems, open systems can gain or lose energy in association with matter transfer (both of these process are illustrated by fueling an auto, a system which gains in energy thereby, without addition of either work or heat).

Energy transformation, also known as energy conversion, is the process of changing energy from one form to another.

Movement of current energy supply systems to greener and more sustainable supply systems, usually from polluting or non sustainable sources to renewable and greener sources.

The energy value of coal, or fuel content, is the amount of potential energy it contains that can be converted into heat.

In open channel flow, specific energy (e) is the energy length, or head, relative to the channel bottom.

Energy-efficient landscaping is a type of landscaping designed for the purpose of conserving energy.

An energy-plus building produces more energy from renewable energy sources, over the course of a year, than it imports from external sources.

A computer system developed by Alfa Laval. The system optimizes the central cooling operations on board a ship. It monitors the seawater temperature and heat load conditions in order to adjust the pump output to the actual operating conditions.

A machine that converts one form of energy into another. A combustion engine connected to an electrical motor can produce electrical energy.

An engine control unit (ECU), also commonly called an engine control module (ECM) is a type of electronic control unit that controls a series of actuators on an internal combustion engine to ensure optimal engine performance.

When spark ignited combustion is not complete for the fuel/air mixture in a cylinder, unburnt mixture "explodes" due to compression creating a knokinging of pinging noise.

An engine margin, normally 10-15% of its maximum continuous rating (MCR), is recommended in order to lower fuel and maintenance costs and to have reserve power for increased speed.

An engine preheater is the device that preheats the engine at low temperatures before starting. It protects and warms up the engine by heating up the coolant and transferring the heat to the engine through the coolant.

The compartment on board a ship that includes the main propulsion machinery as well as the control room, the auxiliary machinery and other equipment.

To obtain good working conditions in the engine room, it is necessary to investigate its layout from a very beginning of any design.

An easily accessible room outside the machinery space with means of closing engine room ventilation, boiler blowers, fuel transfer pumps and fuel valves, as well as means of releasing of fire extinguishing system.

Special attention should be paid to the engine room ventilation in order to ensure trouble free operation of all equipment.

Various tests undertaken on main propulsion and auxiliary machinery during sea trials.

An officer who is qualified by training and examination to operate and maintain machinery.