news:c77ci7tet93oksm2g...@4ax.com...
> "Jonathan" <
Calli...@gmail.com> wrote:
>>
>
> I saw lots of hand waving numbers, but no serious numbers. $16
> billion for the first SPS? Really? I don't find that number at all
> credible and certainly not without some backing.
>
> Have you actually read the DoD paper they point to during that
> presentation? I have. Let me give you a few cogent points from it.
All that you say below is true, but you still miss the point.
The pre-requisites for SPS are things like low cost to orbit
and a greatly expanded commercial launch industry and
even using the surface of the Moon eventually in the longer
terms. And so on.
Well...aren't all things things, those prerequisites, exactly the kind
of things space activity needs to truly become a large and important
aspect of our future???
Isn't that what we all want?
Space Solar Power as the ultimate goal gives a /reason/ to do
all those prerequisites. You can't have low cost to orbit as ...the goal.
You have to have a ...reason to build low cost to orbit.
NASA's problem has been the notion of just build the thing
and some use will be found later. It has to be the other way
around for the commercial sector to jump in.
You have to have a worthy goal to do all those things.
With Apollo everyone could easily see all kinds of good
reasons, tangible and inspiring, that made it click.
Anyone can easily understand the potential of a new and
clean energy source. As energy effects just about everything
one way or another. The larger the basin of attraction, the
larger the fitness peak. The goal has to make as many
connections as possible, like Apollo did by appealing
far and wide for many different reasons.
What better way than connecting NASA and space activity
to a direct solution to both the future of energy and
climate change?
Giving SPS Apollo-like scope and sense of urgency.
Kennedy proved thinking big is the way to start something
special.
>
> 1) It assumes that the power produced would be at a price of $1/kWHr
> for use at forward military bases. Electricity costs in advanced
> countries (where most of the market is) are an order of magnitude
> below that (including nuclear).
>
> 2) The report found that "SBSP cannot be constructed without safe,
> frequent (daily/weekly), cheap, and reliable access to space and
> ubiquitous in-space operations". We don't have that.
>
> 3) "The SBSP Study Group found that individual SBSP technologies are
> sufficiently mature to fly a basic proof-of-concept demonstration
> within 4-6 years and a substantial power demonstration as early as
> 2017-2020, though these are likely to cost between $5B-$10B in total."
> Note the cost for the 'proof of concept' demonstrator. Kind of calls
> that whole $16 billion for the first operational SPS into question,
> doesn't it?
>
> 4) "The SBSP Study Group universally acknowledged that a necessary
> pre-requisite for the technical and economic viability of SBSP was
> inexpensive and reliable access to orbit." Access to orbit is
> anything but inexpensive.
>
> 5) "The SBSP Study Group found that the nation's existing EELV-based
> space logistics infrastructure could not handle the volume or reach
> the necessary cost efficiencies to support a cost-effective SBSP
> system." Keep in mind that that is assuming a cost for electricity an
> order of magnitude higher than what most of us currently pay. Now, I
> can afford for my electricity bill to go up by 10x, although it would
> make me pretty unhappy. Most people can't. Can you?
>
> 6) "In order to cost-effectively build, operate, maintain and repair
> much larger SBSP systems, America needs to develop ubiquitous on-orbit
> space operations, including on-orbit assembly, highly-efficient
> orbital transfer systems, and on-orbit repair, maintenance and
> refueling capabilities." We've got none of that. It also pretty much
> explodes the whole idea that once you put these things up you can just
> ignore them. Read the last part of that last sentence again. "...
> and on-orbit repair, maintenance and refueling capabilities."
>
> 7) "The SBSP Study Group found that growth past a certain (perhaps
> even initial) stage is likely to require or make attractive the use of
> off-Earth materials because of their abundance and significantly lower
> energy costs." I think I've been saying for years that the only way
> an SPS system makes sense is if you have sufficiently ubiquitous space
> access and industrialization that the use of space-based resources
> makes sense.
>
> 8) "The SBSP Study Group found that even with the DoD as an anchor
> tenant customer at a price of $1-2 per kilowatt hour for 5-50
> megawatts continuous power for the warfighter, when considering the
> risks of implementing a new unproven space technology and other major
> business risks, the business case for SBSP still does not appear to
> close in 2007 with current capabilities (primarily launch costs)."
> Launch costs to GEO for significant SV masses have not gone down to
> speak of since 2007, when this study was done. And note that we're
> now allowing the cost of power to float clear up to $2/kWHr before
> this starts to become economically viable. Typical home usage of
> electricity in the US is somewhere around 10-12 MWHrs per year. At
> the $2 that is the upper limit of the cost of SPS power, that amounts
> to an electricity bill of around $2,000 per month. Can YOU afford
> that? Do you think most people can?
>
> 9) "The SBSP Study Group found that America's aerospace industry alone
> does not have all of the necessary skills, knowledge, resources,
> systems or procedures necessary to effectively and economically
> develop SBSP in 2007." That seems to say it all, really.
>
>>
>>>
>>>>
>>>>Once Solar Satellites are up, then 24/7 power can be
>>>>accessed far easier and cheaper, and in far more places
>>>>than ANY other energy source, especially terrestrial
>>>>solar. Since thinly populated areas could justify a rectenna
>>>>when a nuclear or conventional power plant is out of
>>>>the question.
>>>>
>>>
>>> Just what sort of location do you think "a nuclear or conventional
>>> power plant is out of the question" in?
>>
>>Rural areas around the world that can't justify a power plant.
>>
>
> I hope they're rich rural areas, at $2/kWHr.
>
>>
>>Poor areas that can't afford them.
>>
>
> Then they sure can't afford to by power from an SPS at $2/kWHr.
>
>>
>>Disaster areas like Japan that can't wait five or ten years
>>to rebuild.
>>
>
> Cheaper to rebuild.
>
>>
>>Wars where troops are on the move, or in distant places
>>so our troops won't have to be followed around by
>>exploding gas tankers everywhere they go.
>>
>
> They still need gas, so there are still those tankers. Note that the
> military doesn't need to make an economic case.
>
>>
>>Power much larger satellites in orbit.
>>Power spacecraft in orbit or in route.
>>
>
> How's that work, again?
>
>>
>>Power colonies someday.
>>And NASA has proposed that rectennas could
>>be as small as 3 meters...about the size of a car.
>>So...someday maybe each and every car could be
>>powered directly from space.
>>
>
> Ok, so you have a 3 meter rectenna. I assume you mean 3 meters on a
> side, which is sort of bigger than a car, giving 9 square meters of
> area. Assume the power density is around 600 watts/square meter,
> which is a little high, but let's be generous. That gives you about
> 5.5 kW of power, if we assume that the SPS is directly above your car.
> That's less than 7.5 horsepower. Not much of a car.
>
>>
>>Just to name a few...
>>
>
> And none of them are workable. You understand that you're posting
> into the 'science' hierarchy, right?
>
>>
>>>
>>>>
>>>>As once the satellites are up, you only have to roll out
>>>>a great big chicken wire fence to have power.
>>>>
>>>
>>> Bullshit.
>>>
>>
>>A rectenna is little more than chicken wire fence connected
>>to a grid. Far cheaper than building a new power plant.
>>Not even close.
>>
>
> If you assume that the SPS is free. And it IS quite a bit more than
> "chicken wire fence connected into a grid". The fact that you have
> apparently seriously made this statement demonstrates the level of
> ignorance you have achieved about how this stuff all works.
>
>>
>>>
>>>>
>>>>Not build
>>>>multi-billion dollar plants and hundreds of miles of roads
>>>>and railroads or shipping to continuously supply some
>>>>power plant with coal, oil or gas. Or cover hundreds of
>>>>miles of very expensive property with solar panels.
>>>>
>>>
>>> Uninhabited hinterlands (what you describe above) seldom have a large
>>> need for electrical power.
>>>
>>
>>Really! Tell that to India where a fourth of all the food
>>they grow spoils for lack of refrigeration.
>>
>
> Not 'uninhabited hinterlands'. If it costs you $2/kWHr, you can't
> afford to refrigerate the stuff.
>
>>
>>The UN claims rural electrification is the best way to raise
>>poverty levels around the world.
>>
>
> But not at ruinously expensive rates for power.
>
>>
>>>
>>>>
>>>>The point is that Space Solar can travel so much better,
>>>>analogous to the huge improvement that AC power made
>>>>over DC.
>>>>
>>>
>>> Your business case assumes the huge investment required to loft and
>>> maintain a massive array of Solar Power Satellites doesn't exist and
>>> that they are free. They're not.
> <>
>>
>>The cost doesn't matter in the business world, the ability
>>to make a profit matters.
>>
>
> And you don't think costs affect profit? REALLY?????
>
>>
>>Once that is demonstrated
>>a bottomless pit of financing becomes available from
>>the commercial sector. $10 billion dollar financing is
>>a weekly event in the energy sector.
>>
>
> But not for 'investments' that don't have a prayer of showing a profit
> in competition with ANY other power source.
>
>>
>>NASA or the government couldn't hope to finance it
>>directly. The commercial sector can float all the loans
>>it wants once a profit is shown.
>>
>>And if the only thing holding it back is a marginal business case
>>then SSP is far closer to practical and far more beneficial
>>than any other long range goal NASA has proposed.
>>
>
> But that's not the only thing holding it back. Get back to me when
> you can put a pound in geosynch orbit for less than $100.
>
> Frankly, I wish your uninformed view was correct. But it isn't.
>
> --
> "Ignorance is preferable to error, and he is less remote from the
> truth who believes nothing than he who believes what is wrong."
> -- Thomas Jefferson