Insights Blog
-- Browse All Articles --
Physics Articles
Physics Tutorials
Physics Guides
Physics FAQ
Math Articles
Math Tutorials
Math Guides
Math FAQ
Education Articles
Education Guides
Bio/Chem Articles
Technology Guides
Computer Science Tutorials
Forums
General Engineering
Mechanical Engineering
Electrical Engineering
Aerospace Engineering
Nuclear Engineering
Materials Engineering
Trending
Featured Threads
Log in
Register
What's new
Search
Search
Search titles only
By:
General Engineering
Mechanical Engineering
Electrical Engineering
Aerospace Engineering
Nuclear Engineering
Materials Engineering
Menu
Log in
Register
Navigation
More options
Contact us
Close Menu
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Forums
Engineering
General Engineering
As much steam as possible from engine exhaust gas + warm water?
Reply to thread
Message
[QUOTE="russ_watters, post: 6851077, member: 142"] Assuming the numbers in the OP are accurate, the energy available is m * C[sub]p[/sub] * ΔT. The energy required to boil water is m * C[sub]p[/sub] * ΔT to warm it up, then m * H[sub]vap[/sub] to boil it. That input heat is 6.1 MJ/s. That equates to about 500 gal/hour of diesel fuel (assuming a third is going out the tailpipe), which is pretty high -- is this a ship? Anyway, at 2.26 MJ/kg to boil from 100C and 4.186 kJ/kG-C and room temperature input water, that's 2.35 kg/sec of water to steam. In your OP you said .5 kg/sec (.0005 cu m/s) of water. So your efficiency is only around 20%. That's probably realistic. As for designing a heat exchanger, I'd start with figuring out what an exhaust pipe typically looks like for a 6 MW [s]steam[/s] diesel engine. Where did you get 5 cm? That seems small. Also, it's critically important how the water is injected into the pipe. If you spray it, your odds are pretty good of boiling it all off in a short time/distance. Beyond that, it's pretty difficult to do such a design analytically. Heat transfer is a bit of voodoo (it's very difficult to find the coefficients for convective heat transfer). [/QUOTE]
Insert quotes…
Post reply
Forums
Engineering
General Engineering
As much steam as possible from engine exhaust gas + warm water?
Back
Top