Edit post

Edit your reply below.

Post Body
Enter your post below.
[quote user="Paul Milenkovic"] Yes, I was assuming a 100% efficient boiler in calculating the theoretical thermodynamic efficiency of the cycle. 30 percent is perhaps a little low for the combustion efficiency, but combustion efficiency as low as 50 percent when a locomotive is "working hard" may not have been unreasonable (and sending a lot of the thermal content of the coal skyward as black smoke containing carbon particles).  There was some kind of statement that a Big Boy went through 40 tons coal/hour climbing this one hill.  The coal they were using was low-BTU coal (kind of like the PRB coal -- low BTU yes, but also low sulfer), but even allowing for that, I think I once did a rough calculation that the overall coal-to-drawbar efficiency was something like 2 percent under those conditions. [/quote]    Dear Paul, if you do not have Kratvilles Big Boy book, the test-results show a coal/water ratio from 4,5% to 4,7% efficiency, while the 3 runs reached an avarage of 20 mp/h. If you mean boiler efficiency of BB, I read somewhere they were round about 60%. If you need exact numbers of this book, I will look up for you. Kind Regards lars
Tags (Optional)
Tags are keywords that get attached to your post. They are used to categorize your submission and make it easier to search for. To add tags to your post type a tag into the box below and click the "Add Tag" button.
Add Tag