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White roofs have the double effect of significantly reducing the air conditioning load within the building. This reduction in power consumption will probably reduce global warming by avoiding CO2 emissions as much if not more than the direct reflection effect... The peak power demand days in California are during the summer because of all the air conditioning.
One study found that there was between a 15% and 60% reduction in cooling power use just by applying a white roofing compound.
One problem with this is that high albeido (white-ish) pavement doesn't stay that way for very long because concrete ages and gets dirty.
You can read more about this here.
If this is heat rejected from a server farm, it'll be too low grade to do much with it other than heating. You might be able to heat the premise hot water a tiny bit...
Absorption chillers, the common way to do waste heat to cooling, want medium grade waste heat a lot hotter than what's coming from a server farm and steam generation is totally out of the question.
As with anything written by a reporter, engineering details are all f'ed up.
"The project is expected to produce up to nine megawatts of power for the local community."
No, the project will probably pipe 9MW of heat from the server farm over to the housing complex. Hopefully they can use 9MW of heat continuously, summer and winter.
âoeThe energy savings will equate to boiling 3,000 kettles continuously,â
Um - that's a really funny way of thinking about saving energy. 9Mw/3000= 3kw/kettle. That's a hell of a kettle.
For anyone who thinks that running a computer in their house to heat it is clever, you would do a lot better (price AND CO2 wise) just running a furnace or your heat pump. Resistance heating is the WORST way to heat a house.
If you're going to be producing the heat anyway and can find a use for it like this, please do! Don't think that because you CAN use a computer for a heater means that it makes sense.
How is a mac mini different from what you want?
Not sure where you got the 50~60k battery replacement, because it's simply not true
The state of charge of the battery in a prius is carefully kept between 45% and 75% in order to give the battery pack a long life. And by long I mean that the prius taxis used up in Vancouver with 200k+ miles on the clock still haven't failed a pack.
The only packs that have failed in service are those that have been damaged in accidents or those that have been tampered with by "tuners".
It was on June 16th, 1987 that the SDF-1 received its first caller at
300bps. This little Apple ][e BBS of the late 80s turned into a Public
Access UNIX System with the demise of "killer.dallas.tx.us" during the
"Operation Sundevil" raids. Since then it has grown to become the oldest
and largest continually operating PUBNIX on the planet."
Link to Original Source
Full press release text:
The SDF Public Access UNIX System Celebrates 20 Years!
It was on June 16th, 1987 that the SDF-1 received its first caller at 300bps. This little Apple ][e BBS of the late 80s turned into a Public Access UNIX System with the demise of "killer.dallas.tx.us" during the "Operation Sundevil" raids. Since then it has grown to become the oldest and largest continually operating PUBNIX on the planet.
Over the years SDF has been a home to 2+ million people from all over the world and has been supported by donations and membership dues. SDFers pride themselves on the fact that theirs is one of the last bastions of "the real INTERNET", out of the reach and scope of the commercialism and advertising of the DOT COM entities. It is a proponent of SMTP greylisting as opposed to content filtering and offers that as an option to its members.
While access to basic services are free to everyone, lifetime membership can be obtained for a mere onetime donation of $36. And it is the members who decide which programs and features are available. The members communicate via a web free, google inaccessible, text bulletin board ('bboard') as well as an interactive chat ('com') where users battle each other in the integrated netris matches. The interface of these programs harks back to the days when TOPS-20 CMD J-SYS ruled the ARPANET.
SDF has also become home to well known hackers such as Bill Gosper, Tom Ellard (Severed Heads), Geoff Goodfellow, Carolyn Meinel and Ezra Buchla, son of the father of the Synthesizer. From this pool of talent you might expect more than just computing, and you'd be correct. An annual music compilation is published featuring original music ranging from electronic noise to improvised piano sonatinas. Gosper's puzzles which he has cut at his favorite laser shop are frequently given away as membership perks or through fundraising raffles.
There are always classes being taught on SDF as well, where instructors and students enjoy free access to the latest teaching and programming tools. Instructors manage their own classes in such a way as not to be encumbered by their own school's outdated utilities or computer security restrictions, which can hamper the learning process.
And where else would you expect to be able to locally dialup at 1200bps from just about anywhere in the USA and Canada with a Commodore 64 and get a login prompt? SDF! As well as direct login, SDF offers PPP and PPPoE via analogue dialup (1200bps — 56kbps), ISDN and DSL. Members also have access to the SDF VPN (Virtual Private Network) and Dynamic Domain Name Service.
One of the many interesting and esoteric aspects of life on the SDF-1 is GOPHER. All users have access to their own GOPHER space and a number of them continue to find it a useful way to share text and data. And if you don't want to relive that past, SDF's 'motd.org' project offers a collaboration amongst members to share source and security tweaks for the latest wikis, web forums, photo galleries and blogs.
SDF runs NetBSD on a cluster of 12 DEC alphas with 3 BGP'ed T1s linking it to the INTERNET. It is an annual supporter of the NetBSD foundation and the Computer History Museum (CA). One of its original incarnations, an AT&T 3B2/500, is displayed annually at the Vintage Computer Festival."
Link to Original Source
For crying out loud, all users have access to their own GOPHER space as well as more modern technologies like blogs, wikis and so forth. What more could you want?"This little Apple ][e BBS of the late 80s turned into a Public Access UNIX System with the demise of "killer.dallas.tx.us" during the "Operation Sundevil" raids. Since then it has grown to become the oldest and largest continually operating PUBNIX on the planet.
Link to Original Source
Link to Original Source