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Project Apollo Beta 7.0 released!
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| | |-+  Fuel cell reactant valves
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Author Topic: Fuel cell reactant valves  (Read 18092 times)
Vinny003
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« on: March 10, 2014, 02:55:08 PM »

Hi, guys!

Question for you, I'm not 100% sure, how do I close the fuel cell reactant valves? When I click on one of the three fuel cell reactant valves, the fuel cell reactant valves won't close, am I missing a step on how to shut down the fuel cells? Thanks!

                   Cheers,
                  Vincent
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Northlight
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« Reply #1 on: March 12, 2014, 02:36:24 AM »

This is what the CSM Systems Checklist says:

8   FUEL CELL SHUTDOWN (APPLICABLE FC)

    cb FC RAD - close
    cb FC REAC - close
    FC REAC - OFF 3
    FC HTRS - OFF
    FC PUMPS - OFF
    cb FC PUMPS AC - open

    At Tskin < 200F
      H2 PURGE LINE HTR - ON (for 20 min)
      FC PURGE - O2 (TIL O2 PRESS = N2 PRESS)
      FC PURGE - H2 (TIL PRESS STABILIZES)
      FC PURGE - OFF
      H2 PURGE LINE HTR - OFF
      cb FC RAD/REACS - open
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Vinny003
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« Reply #2 on: March 12, 2014, 02:27:13 PM »

Hi, Northlight!

Thanks! I'll give it a try!

             Cheers,
        Vincent
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Vinny003
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« Reply #3 on: March 17, 2014, 02:18:57 PM »

Hi, Northlight!

Where are the FC cb's located? Thanks!

            Cheers,
         Vincent
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almostfm
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« Reply #4 on: March 17, 2014, 03:46:08 PM »

The breakers are on Panel 226.  Go right to Panel 5, and then down.
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Vinny003
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« Reply #5 on: March 17, 2014, 04:02:35 PM »

Hi, almostfm!

Okay, got it! Thanks!

            Cheers,
         Vincent
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Vinny003
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« Reply #6 on: March 18, 2014, 01:59:14 PM »

Hi, guys!

Now that I know how to shutdown the fuel cells, how do I get the fuel cells up and running again? Thanks!

               Cheers,
            Vincent
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eddievhfan1984
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« Reply #7 on: March 19, 2014, 05:07:58 AM »

Once the reactant valves are shut, you can't re-open them; only ground servicing will reopen them. Your fuel cells will have to stay off if you close the valves.
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Vinny003
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« Reply #8 on: March 19, 2014, 05:10:00 PM »

Hi, eddievhfan1984!

Question for you, how long the fuel cells is opened before launch. I would like to see the fuel cells open up in nassp-project apollo! Thanks!

            Cheers,
          Vincent
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meik84
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« Reply #9 on: March 20, 2014, 06:15:14 AM »

Quote
Once the reactant valves are shut, you can't re-open them
Oh, you can reopen them; in NASSP, this will also restart the FC. In reality, the start-up process was a lot more difficult and required (among others) preheating of the electrolyte and a lot of H2 and O2, none of which is available in space. So once they closed the RC valves and the electrolyte temp dropped under a certain value, the FC was gone forever.
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eddievhfan1984
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« Reply #10 on: March 21, 2014, 04:11:51 PM »

Oh, OK. I just had the film on the mind, but I see your point. Tongue

So because of that limitation, the fuel cells have to be running at scenario load; no manual startup?
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Vinny003
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« Reply #11 on: March 21, 2014, 04:24:23 PM »

Hi, meik84!

I got a couple of questions for you, how do i restart the fuel cells in NASSP? The fuel cell module temp and the fuel cell t skin temp gauge is pegged to maximum. How do I get the fuel cell module temp and the fuel cell t skin temp down? Thanks!
.        
.          cheers,        
.      Vincent
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meik84
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« Reply #12 on: March 21, 2014, 04:56:24 PM »

Quote
Oh, OK. I just had the film on the mind, but I see your point.
The movie simplifies a lot. In reality, EECOM suspected (hoped?) that the leak was in the internal plumbing of the FCs that showed unnormal O2 flow; closing the RC valves would have stopped the leaking. For them, that was the last thing to try -most of the instrumentation of the cryo/EPS-plant was gone and that was the last resort.
Quote
So because of that limitation, the fuel cells have to be running at scenario load; no manual startup?
Uh...I guess in NASSP you can restart them anytime, assuming that the temps are in the green band. I haven't looked in the code, though.

@Vinny: Uh...out of my mind:
- insure that the FC pumps are running (FC PUMPS switches on panel 5 up/down and resp. FC PUMPS-AC cbs on panel 226 closed)
- FC RADIATORS (panel 3) in NORMAL (indicator grey)
- you can also try to switch off the heaters. Don't know if that helps.
- it may take some time till the temp drops; I've never done something like that to my FCs...
Anyway, are you on BATs only? Not that you kill your batteries and/or their voltage is already too low for the inverters.
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Vinny003
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« Reply #13 on: March 21, 2014, 06:14:09 PM »

Hi, meik84!

I'm running the all 3 FCs. Do you know how long does it take for the FC module temp and the FC t skin temp will start to go down or become unpegged? Thanks!
.   
.       cheers,
.     Vincent
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meik84
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« Reply #14 on: March 21, 2014, 06:48:17 PM »

Should depend on how long you've roasted them. When I tried it 5 minutes ago, they recovered quite fast with the pumps running, radiators in normal and heaters off. Maybe you'll also have to open the reacs valves; don't forget that you'll have to close the resp. cb on 226 to open them.
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