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A new design ship in the Philippines is partly powered by wave energy

bbc.com

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Re: A new design ship in the Philippines is partly powered by wave energy

#31

Post by abbe98 »

mehrdadn wrote: post #25
messo wrote: post #22

> The emissions from travel it took to report this story were 0kg CO2. The digital emissions from this story are an estimated 1.2g to 3.6g CO2 per page view. Maybe this is what finally could push companies towards making lighter and more efficient websites? At least an estimate of a webpages watt usage (server and client side).

> The digital emissions from this story are an estimated 1.2g to 3.6g CO2 per page view. Holy cow, that is a lot . 1-3 grams of CO2 per single load of a page? Makes me feel guilty about even clicking the article.

Sending a short email is estimated to release 4g CO2:

https://phys.org/news/2015-11-carbon-footprint-email.html

Re: A new design ship in the Philippines is partly powered by wave energy

#33

Post by Xylakant »

bigbluedots wrote: post #29

Aren't all ships partly powered by wave energy if they're facing the right way?

No, generally speaking, waves pass underneath a floating object in practically all circumstances. You may feel like there’s a forward surge when a wave comes in from behind, but all forward momentum gained while sliding down the wave is lost once the wave peak has overtaken you and you’re climbing back up the wave. Basically, waves will induce a circular motion on a floating object.

There’s ways to trick and gain forward speed from waves, by basically picking a wave that’s high enough and continually sliding down on the front - Surfers for example. But that only works if your object is substantially smaller than the wave in question - which is sort of impossible for ships.

Re: A new design ship in the Philippines is partly powered by wave energy

#34

Post by throwaway_pdp09 »

messo wrote: post #22

> The emissions from travel it took to report this story were 0kg CO2. The digital emissions from this story are an estimated 1.2g to 3.6g CO2 per page view. Maybe this is what finally could push companies towards making lighter and more efficient websites? At least an estimate of a webpages watt usage (server and client side).

Not the whole story. The link provides more details (https://www.bbc.com/future/article/20200131-why-and-how-does...)

It involves counting carbon from journalists' travel etc. So a full tally (which is good but isn't just about literal pages loaded)

I also wonder how much JS + adverts have to offer as part of that carbon load.

Re: A new design ship in the Philippines is partly powered by wave energy

#35

Post by akiselev »

dtech wrote: post #27
mehrdadn wrote: post #25

Earlier quoted context omitted.

> The digital emissions from this story are an estimated 1.2g to 3.6g CO2 per page view. Holy cow, that is a lot . 1-3 grams of CO2 per single load of a page? Makes me feel guilty about even clicking the article.

That is not a lot. it's about 4mWh for coal power. In comparison, leaving a 300W computer setup on for 10 hours each day with coal power is 3KWh or 2.5kg of CO2.

So it takes the computing power equivalent of a 300W PC running for 10 hours to serve a thousand page views? At 50 req/page view, that server is handling ~1.5 requests per second.

That kind of throughput can be handled by a RaspberryPi, so are we seriously wasting 95%+ of the power budget routing packets and idling servers?

Re: A new design ship in the Philippines is partly powered by wave energy

#36

Post by pjc50 »

mehrdadn wrote: post #25
messo wrote: post #22

> The emissions from travel it took to report this story were 0kg CO2. The digital emissions from this story are an estimated 1.2g to 3.6g CO2 per page view. Maybe this is what finally could push companies towards making lighter and more efficient websites? At least an estimate of a webpages watt usage (server and client side).

> The digital emissions from this story are an estimated 1.2g to 3.6g CO2 per page view. Holy cow, that is a lot . 1-3 grams of CO2 per single load of a page? Makes me feel guilty about even clicking the article.

The average human breathes out 1g of CO2 every minute and a half.

By comparison, average UK cars put out 124.5g for every km driven.

It's not nothing, but it's not a lot either. It probably is worth evaluating the electrical efficiency of the tech industry as a whole, both in terms of highly executed code hotspots and entire pieces of business of questionable utility (ad javascript, cryptocurrency proof-of-waste), but individual web pages are the plastic straws of the industry compared to the giant flare stacks of real problems.

Re: A new design ship in the Philippines is partly powered by wave energy

#37

Post by pjc50 »

duxup wrote: post #2

When I see a wave foil I wonder how that doesn't make more drag than power...is this similar or something different?

What sort of wave foil do you mean?

It's not clear from this article how the trimaran works, but you can see in the photos that there is a gap at the top of the outboard hulls. So I suspect it's the relative motion between the outboard hulls and the inboard one which is converted to hydraulic power - makes sense, it will be a short movement with a huge force behind it. That is then fed to a generator, electrical storage and propulsion unit.

Re: A new design ship in the Philippines is partly powered by wave energy

#38

Post by maelito »

messo wrote: post #22

> The emissions from travel it took to report this story were 0kg CO2. The digital emissions from this story are an estimated 1.2g to 3.6g CO2 per page view. Maybe this is what finally could push companies towards making lighter and more efficient websites? At least an estimate of a webpages watt usage (server and client side).

We need an open source model for estimating the CO2 emissions of a server, of the network (including CDNs, etc.), of a device.

Re: A new design ship in the Philippines is partly powered by wave energy

#39

Post by el_tone »

russfink wrote: post #14

Novice here - isn't there some static hull shape that would react to waves and result in motion, much like those plastic widgets that spin only in one direction?

You can capture wave motion in all directions with a pendulum based design like this:

https://www.witt-energy.com/howitworks.html

Re: A new design ship in the Philippines is partly powered by wave energy

#40

Post by barbegal »

Are there any technical details available for this system? The linked article doesn't do a good job of explaining how it works or how much impact it will have.

Assuming the boat can harness 10% of the wave's energy, wave power in the Philippines is more like 10kW per meter of wave length captured on average so that equates to ~1kW per metre of wave. Let's assume this boat can capture roughly 10m of wave then that is an average power generation of ~10kW or ~ 10hp. A boat of this size will probably have 500+ hp engines so a boost of 10hp won't have a huge amount of impact.

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