Can you provide a value for the absolute efficiency of this chart?
Which propulsion unit reached 50 gl%efficiency in the 79 th?? I don't see that information anywhere in your postings.
With 20 g load yoyr dorn to 50 g of the peak efficiency acvording to your chart, that were you will end up.with system which needs to operate in a vide power range and this is in line with ship generators.
BTW Diesel generators are cheap standart systems and you can easily use 1,2 ,3 or.more of them for this kind of job, which will keep the partvload efficiency even higher (even when a minimum number of two are operating in parallel .
So smaller your system is, so earlier you need to switch tio a big gas turbine which than operates uneconomically at part load.
The given example of 51 % efficiency of the MAN and Waertsilae is also not the end of the line, when truck Diesels can even reach almost 54 %.
Most important, it's not about building the.most efficient part load system for a cruiser, but finding a practical solution which brings a giant step in energy savings. It almost doesn't matter if a system is 2 percent more efficient in a very narrow load range or not. You can choose between a standart modular solution of Dieselgenerators or a high end mega advanced hyphothetical waste heat steam system with multiple reaheating, staged feedwater preheating and so on. Gues who wins?
As said, so more sophisticated the steam system is, so more sensitive it gets to changing parameters. When the turbine exhaust temperature drops at part load, the whole multiple reheating doesn't work anymore.
Which propulsion unit reached 50 gl%efficiency in the 79 th?? I don't see that information anywhere in your postings.
With 20 g load yoyr dorn to 50 g of the peak efficiency acvording to your chart, that were you will end up.with system which needs to operate in a vide power range and this is in line with ship generators.
BTW Diesel generators are cheap standart systems and you can easily use 1,2 ,3 or.more of them for this kind of job, which will keep the partvload efficiency even higher (even when a minimum number of two are operating in parallel .
So smaller your system is, so earlier you need to switch tio a big gas turbine which than operates uneconomically at part load.
The given example of 51 % efficiency of the MAN and Waertsilae is also not the end of the line, when truck Diesels can even reach almost 54 %.
Most important, it's not about building the.most efficient part load system for a cruiser, but finding a practical solution which brings a giant step in energy savings. It almost doesn't matter if a system is 2 percent more efficient in a very narrow load range or not. You can choose between a standart modular solution of Dieselgenerators or a high end mega advanced hyphothetical waste heat steam system with multiple reaheating, staged feedwater preheating and so on. Gues who wins?
As said, so more sophisticated the steam system is, so more sensitive it gets to changing parameters. When the turbine exhaust temperature drops at part load, the whole multiple reheating doesn't work anymore.
