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Retrofitting refers to the addition of new technology or features to older systems.Principally retrofitting describes the measures taken in the manufacturing industry to allow new or updated parts to be fitted to old or outdated assemblies (like blades to wind turbines).The term is also used in the field of environmental engineering, particularly to describe construction or renovation projects on previously built sites, to improve water quality in nearby streams, rivers or lakes. The concept has also been applied to changing the output mix of energy from power plants to cogeneration in urban areas with a potential for district heating.Many naval vessels have undergone retrofitting and refitting, sometimes entire classes at once. For instance, the New Threat Upgrade program of the US Navy saw many vessels retrofitted for improved anti-air capability. Naval vessels are often retrofit for one of three reasons: to incorporate new technology, to compensate for performance gaps or weaknesses in design, or to change the ship's classification.

[ "Ecology", "Hydrology", "Structural engineering", "Forensic engineering", "Waste management", "Green retrofit" ]
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