An economiser, as the name suggests increases the overall economy of the main propulsion plant.
The heat from burning fuel in main engine is mostly used to move the piston and thereby create the main propulsion onboard. Some of this heat energy cannot be used in the process, as the process is never isothermal. This heat energy is used to produce steam onboard, using economisers.
The process is simple. The unused heat from the main engine exhaust is transferred to water in the economiser, which produces the necessery steam for the propulsion plant. When economiser is absent, this head energy need to be provided by burning extra fuel in boilers, which costs $$$. So economiser in the end, increases the overall heat efficency or the ECONOMY of the propulsion plant.
The heat from burning fuel in main engine is mostly used to move the piston and thereby create the main propulsion onboard. Some of this heat energy cannot be used in the process, as the process is never isothermal. This heat energy is used to produce steam onboard, using economisers.
The process is simple. The unused heat from the main engine exhaust is transferred to water in the economiser, which produces the necessery steam for the propulsion plant. When economiser is absent, this head energy need to be provided by burning extra fuel in boilers, which costs $$$. So economiser in the end, increases the overall heat efficency or the ECONOMY of the propulsion plant.
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