[AR] Re: OT Nozzle shapes
- From: Uwe Klein <uwe@xxxxxxxxxxxxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Wed, 13 Nov 2013 15:43:48 +0100
Keith Henson wrote:
On Wed, Nov 13, 2013 at 12:49 AM, Uwe Klein <uwe@xxxxxxxxxxxxxxxxxxx> wrote:
Keith Henson wrote:
I have a fairly bizarre problem. Need to get rid of 3 GW of waste
heat from lasers in orbit. The pump diodes use a total flow of 60
cubic meters per second at 22 deg C inlet and 34 deg C outlet.
Take the working temperature further down ? ( increases efficiency )
The laser efficiency goes up as you take the working temperature down,
but not much.
300K to 100K can give you 50%.
Other effects work against it, though looking around
theres quite a bit of work around on cryogenically cooled laser diodes.
so it must make some sense. ( But I haven't kept current in that area )
look into other coolants that are lighter and have less viscosity?
It's hard to beat water
wild shot:
find a way to compress (centrifuge ? ) the evaporated coolant
to higher temperatures, radiate away the heat ...
this is a possibility. It gets tricky not just because of the extra
energy needed to pump the heat uphill, but because the radiator walls
must be thicker to take the higher pressure.
What about that heat exchanger from the Sabre project :-?
uwe
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