Thank you again to the group that replied to the questions I had and I am grateful for your insight.
I am now investigating how to determine the efficiency of a drive over time.
Does anyone know how to check the efficiency claims of the manufacturer? ...and more so, what parameters to check if...
Thank you all for your comments and wise insight.
I went back to the books, reviewed your collective intelligence, and I think I have a better understanding of where I was wrong.
I have more questions on efficiency now... but I will need to hit the books for that.
I see also that cyclos need...
Thank you Gunnar for your excellent reply. I feel I am making progress. Your assumption is right, they are synchronous motors.
You said: "instead, what you should worry about is the energy (equals oil consumed) consumption of the propulsion system. And that is quite low when you are running a...
Thank you all for your comments and help.
Yes, I have 2x10MW propulsion motors driven by a Cycloconverter and the pf going in is bad, specially at low RPM. There is not much I can do there.
Nevertheless, for future builds... I will also have 2x20MW propulsion motors and yes, I will opt for a...
Thank you LionelHutz for your insight. I share your thought. Do we know by how much? I have a 20MW load driven by VFDs so a small difference may end up to be a big difference.
www.MarineEngineeringManagement.com
Thank you DickDV for your prompt reply. I understand the use of VFD for load reduction, or rather adjustable load rather than static. However, different types of VFDs operate across a range of pf. VSI type drives usually being the one closest to unity.
Hence, does anyone know why and by how...
There are a number of variable speed drive technologies out there. While some have a uniform power factor close to unity across the operational range (such as the VSIs), others go from anywhere around 0.4 to 0.8 (such as the Cyclos).
So, is any one type of electrical variable speed drive...
Hello CHSARANT,
I am curious why not simply measure or evaluate the engine performance as per their fuel consumption. After all, aren't we all looking to get the biggest bang for the lowest buck?
We evaluate performance as per the fuel consumption.
All the best...
Hello EricFrance:
Section 4 for Submersible Handling Cranes in Chapter 3 reads:
"4.4 Dynamic forces
4.4.1. The hoisting factor, Fh, to be used for submersible handling systems incorporates the effects of the submersible passing through the water/air interface and is to be taken as 1,7. "
Let...
I used to work for Lloyd's (comparable to ABS, DNV, RINA, etc.) What you'll need to do is build (develop) the light raft light as per the IMO Standard and then have a lab or testing house test a sample unit while it is witness by an IACS member Classification Society (Lloyd's, DNV, ABS, etc.)
As...
I certainly did forget about it.
Do you have any good references on what is the cost/MW for these renewable energy sources. Not only asset installation, but also life cycle cost. I think that the incinerator/generators need "costly" garbage, no? (Meaning that they do not burn just anything)...
I think the group may also enjoy this visualization of losses... slightly outdated but the current numbers are not far from this.
Eric W. Schreiber, BSc(EE), MBA
www.ericwschreiber.com
http://www.linkedin.com/in/eschreiberhttps://eed.llnl.gov/flow/images/LLNL_Energy_Chart300.jpg
Thank you for the comments and contributions. I certainly learned something...and makes me wonder further on the pros and cons of the popular renewable energy technologies (tidal, wave, wind, solar, hydro, etc.) Personally I think that solar power has big disadvantages (asset that works only...
Pelamis Wave Energy Converter generating electricity into the Portuguese grid off the coast of Aguçadoura, Portugal, October 2008. Can anyone tell me why we do not do more of these projects?
http://www.youtube.com/watch?v=JYzocwUfpNg
http://www.youtube.com/watch?v=F0mzrbfzUpM...
