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- Newsgroups: sci.space.shuttle
- Path: sparky!uunet!wupost!cs.utexas.edu!bcm!aio!gothamcity!kjenks
- From: kjenks@gothamcity.jsc.nasa.gov
- Subject: Re: Shuttle cooling systems
- Message-ID: <1992Dec13.231735.25630@aio.jsc.nasa.gov>
- Originator: kjenks@gothamcity
- Keywords: radiator panels
- Sender: kjenks@gothamcity.jsc.nasa.gov
- Organization: NASA/JSC/GM2, Space Shuttle Program Office
- References: <SDD.92Dec10104210@zip.larc.nasa.gov> <1992Dec10.233907.4549@titan.ksc.nasa.gov> <1992Dec11.162931.1@vf.jsc.nasa.gov>
- Date: Sun, 13 Dec 1992 23:17:35 GMT
- Lines: 42
-
- In article <1992Dec11.162931.1@vf.jsc.nasa.gov> oliver@vf.jsc.nasa.gov (Pat
- Oliver) writes:
- >Jim provided a good overview of the orbiter cooling. My comments expand on
- >what he said.
-
- Ken:
- And my comments expand on what Pat said. (We could go on like this for
- months.)
-
- Jim:
- >In article <1992Dec10.233907.4549@titan.ksc.nasa.gov>,
- >dumoulin@titan.ksc.nasa.gov (Jim Dumoulin) writes:
- >> When the payload bay doors are opened, radiator panels attached to
- >> the doors radiate heat. If this is insufficent during orbiter
- >> operations, the flash evaporator subsystem is automatically activated.
-
- Pat:
- >The radiators consist of four panels mounted on each of the payload bay
- >doors. The forward two panels on each door can be deployed to provide
- >four additional cooling surfaces. Very few missions have flown hot
- >enough attitudes to require the deployment of the radiators.
-
- Ken:
- We don't like to deploy the radiator panels. In their deployed
- position, they don't really give that much more radiative cooling
- capability than leaving them stowed flush against the payload bay doors
- (PLBD's), and if they stick open, the PLBD's won't close properly,
- causing what's known in MCC as "a bad day." After this happened often
- enough in simulations (sims), we wrote some flight rules which
- discourage the use of deployed radiator panels, as opposed to stowed
- radiator panels.
-
- Since this wasn't known early on in the Program, you'll still see
- "artist's conceptions" of the Orbiter from the '70's and '80's with
- the radiator panels deployed. By now, even the artists have
- figured out that we don't actually deploy these things any more.
-
- -- Ken Jenks, NASA/JSC/GM2, Space Shuttle Program Office
- kjenks@gothamcity.jsc.nasa.gov (713) 483-4368
-
- "...Development of the space station is as inevitable as
- the rising of the sun." -- Wernher von Braun
-