Meadville Space Center
Welcome, Guest. Please login or register.
October 31, 2020, 06:04:48 PM

Login with username, password and session length
Search:     Advanced search
Gemini 060615 released!
25068 Posts in 2094 Topics by 2266 Members
Latest Member: twa517
* Home Help Search Login Register
+  Meadville Space Center
|-+  Project Apollo - NASSP
| |-+  Project Apollo - NASSP News & Discussion
| | |-+  Support & Bugs (Moderators: movieman, Tschachim, Swatch, lassombra)
| | | |-+  Fuel cell restart
« previous next »
Pages: [1] Print
Author Topic: Fuel cell restart  (Read 1607 times)
ATC_yul
Full Member
***
Posts: 19


View Profile
« on: February 17, 2009, 04:22:25 PM »

Hi everyone!

I had read somewere (a long time ago) that if you shut down a working fuel cell on the apollo spacecaft it was not possible to start it up again (I think it has something to do with the ability to rise the fuel cell temperature to it's working temperature).  Is this true?

If not, what is the procedure to get one fuel cell back online
Logged
Tschachim
Project Apollo - NASSP
Administrator
Hero Member
****
Posts: 3700


nassp.sf.net


View Profile WWW
« Reply #1 on: February 17, 2009, 05:24:32 PM »

Yes, it's true. When you close a fuel cell reactants valve, it can't be reopened. But in Project Apollo - NASSP you can reopen these valves, also you can't damage a fuel cell by overheating or freezing: http://nassp.sourceforge.net/wiki/Electrical_Power_System_(CSM)#Fuel_cell_shutdown_and_restart

Cheers
Tschachim
Logged

jalexb88
Sr. Member
****
Posts: 328


View Profile
« Reply #2 on: February 17, 2009, 07:12:56 PM »

Are there any plans to make these valves impossible to reopen in NASSP, for more realism? And also simulate the heat or cold damage?

Alex
Logged
ATC_yul
Full Member
***
Posts: 19


View Profile
« Reply #3 on: February 17, 2009, 09:02:33 PM »

Ok, but in real apollo flight, is it because of the loss of temperature inside the cell that it cannot be reopen or what?   I mean, what are the mechanics behind the FC reactant valves that makes them impossible to reopen.

Thanks!
« Last Edit: February 17, 2009, 09:07:09 PM by ATC_yul » Logged
bluespace88
Project Team Member
Full Member
****
Posts: 241



View Profile
« Reply #4 on: February 17, 2009, 09:07:41 PM »

it is because each valve is a very delicate piece that needs a team of engineers to reopen it on the ground, something that they couldn't do in space.
Logged
ATC_yul
Full Member
***
Posts: 19


View Profile
« Reply #5 on: February 17, 2009, 09:13:44 PM »

Ok...  so it's not intended to be use (open and close) but just for emergency.

Thank you all
Logged
bluespace88
Project Team Member
Full Member
****
Posts: 241



View Profile
« Reply #6 on: February 17, 2009, 09:26:24 PM »

Like in Apollo 13's case, where they thought shutting the valves would isolate the leak areas and stop the leak.
Logged
Pages: [1] Print 
« previous next »
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.10 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!