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A regenerative thermal oxidizer (RTO) is an example of a waste heat recovery unit that utilizes a regenerative process.. A waste heat recovery unit (WHRU) is an energy recovery heat exchanger that transfers heat from process outputs at high temperature to another part of the process for some purpose, usually increased efficiency.
[23] [24] [25] On modern diesel-powered ships, this vacuum can instead be produced by an ejector, usually worked by the output from the brine pump. Working under vacuum also reduces the temperature required to boil seawater and thus permits evaporators to be used with lower-temperature waste heat from the diesel cooling system.
When certain systems such as waste heat recovery (using waste heat to do work rather than dissipate) are added to the power plant, significant savings can be observed. One study shows that an LNG engine with a WHR system saves money compared to a diesel engine with WHR.
For example, global forcing from waste heat in 2005 was 0.028 W/m 2, but was +0.39 and +0.68 W/m 2 for the continental United States and western Europe, respectively. [21] Although waste heat has been shown to have influence on regional climates, [22] climate forcing from waste heat is not normally calculated in state-of-the-art global climate ...
The engines have waste heat recovery (WHR) systems; these are also used in 20 other Mærsk vessels including the eight E-class ships. The name "Triple E class" refers to three design principles: " Economies of scale, energy efficiency, and environmental impact improvement ".
The WR-21 is the first aeroderivative gas turbine to incorporate gas compressor intercooler and exhaust heat recovery system technologies that deliver low specific fuel consumption across the engine's operating range. [3] It offers a reduction in fuel burn of 30% across the typical ship operating profile. [5]
A series of heat exchangers are used to regasify the LNG. These may include submerged combustion vaporisers, [15] or an intermediate fluid exchanger (using propane or other fluids), [16] or the use of waste heat from a nearby plant such as a power station. [17] Final heating of the gas may use air or seawater heat exchangers.
Heat recovery systems in private homes can have an efficiency as low as 30% or less. It may be more realistic to use energy conservation like thermal insulation or improved buildings. Many areas are more dependent on forced cooling and a system for extracting heat from dwellings to be used for other uses are not widely available.