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Questions tagged [energy]

the sustainable use of energy, through efficiency and renewables. Use this tag for questions on energy in general. For questions on a specific energy type see [electricity], [heating] or [light]. For questions specificially about efficiency, use [energy-efficiency]

2
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2answers
45 views

Using LEDs to generate electricity

I recently saw an article that said that LEDs can use electricity to produce light or they can turn light into electricity. If this is true, could the excess light that we have coming into our homes ...
2
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2answers
56 views

What is marginal energy?

I answered to a question and used the term "marginal energy". The answer wasn't understood by all, so I'm going to expand on the term to illustrate how it works. So, what is marginal energy?
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2answers
130 views

Is hydrogen a good way of storing energy from excess hydroelectric generation? [closed]

Referring to hydro electricity generation, a lot of what we produce is wasted as the buyer buys only the minimum generation. What would be the appropriate measure to use that excess energy? Is ...
1
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1answer
94 views

Is it possible to harvest energy from the storm?

My idea of a device for harvesting energy from wind, waves and especially storms is introduced in the manuscript below. If used in reality, this device will harvest significant amounts of energy from ...
3
votes
1answer
141 views

Is Tesla Powerwall a good investment?

I'm trying to determine if investing in a couple of Tesla Powerwall units to store solar energy is a wise financial decision. My energy cost is $0.1649/kWh. The installed price of the two Powerwall ...
3
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1answer
96 views

The least sustainable pathway of the IPCC SR15 report

Looking briefly at the recent IPCC report it presents a number of pathways for keeping global warming below 1.5 degrees celsius by 2100. These follow a spectrum from enormous reductions in consumption ...
2
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3answers
95 views

Energy use for monitor vs pc tower

I work in a few schools where children have been taught to turn off the monitors to save energy. Unfortunately, this is all that they turn off. Every Monday morning I find 30+ computers running with ...
-2
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1answer
93 views

Why does wind just track the economy

Whenever oil booms, wind booms too. Whenever oil production crashes wind crashes too. The US added about 5GW or 2 million barrels of oil equivalent this year of wind and 300 million barrels of oil in ...
3
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1answer
73 views

What is the energy and greenhouse gas footprint of Skysource/Skywater water generator?

The Water Abundance X-Prize was recently awarded to the Skysource/Skywater alliance for: ... developing an easily deployable high-volume water generator that can be used in any climate, meeting the ...
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0answers
96 views

What ecofriendly well paying jobs in deep learning are there?

I'm currently learning how to train and use neural networks, as I've heard getting into this field would be worthwhile from the people at https://80000hours.org/ Is there any application of this ...
3
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3answers
65 views

What sort of pellet mill can be used for biofuels?

I'm thinking that it would be useful to have a pellet mill at home to turn biowaste into fuel pellets. It would be nice to turn sawdust and wood shavings into fuel pellets as well but that I think is ...
4
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2answers
115 views

Differences in efficiency between oven, toaster oven, and stove?

Wondering how efficient different cooking methods are (for the sake of example, assume a dish in a cast iron pot heated by stovetop vs. oven). Stove seems to use less energy than an oven (as the ...
5
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3answers
107 views

Can the heat generated in a data center be used to heat households and offices?

I've just read the article Microsoft sinks a data center off the Scottish coast (The Verge, 6 June 2018) I understand that the cooling of a data center is a problem. Data centers produce huge amounts ...
5
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1answer
83 views

What are the Energy Return on Investment (EROI) values like for biogas?

Biogas seems to be a really great idea but I'm wondering how much energy you get out vs. what you need to put in. I know natural gas is around 10.0 and I was wondering how biogas stacks up by this ...
5
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1answer
155 views

Are crypto currencies sustainable?

Except generating a different kind of "money value", what is the sustainable value of crypto currencies compared to the energy consumed to generate them? Compared to currencies working with ...
5
votes
3answers
154 views

What capacity solar system is required for new homes under the California 2019 Building Energy Efficiency Standards (Title 24)?

From the press release (emphasis added): Moving to cut energy use in new homes by more than 50 percent, the California Energy Commission [CEC] today adopted building standards that require solar ...
15
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1answer
139 views

Does transporting plastic offset the benefits of recycling it?

Apparently China has been processing about half the world's waste until this year, and most of that waste is transported over the ocean in large container ships. Recycling plastic uses less energy and ...
5
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3answers
63 views

Cost benefit analysis of a PV array with racking to set optimal angle, vs a larger array

I'm thinking of installing some panels on the roof. It's unshaded but only pitched at 5 degrees on long run roofing iron. Would I be better off racking at an angle to optimize for winter sun, or just ...
4
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3answers
105 views

Could hotels charge guests for the utilities they use to encourage conservation?

I travel often for work and stay in hotels. I have observed that with no direct incentive, it's often hard to stay motivated to make such sustainable choices as taking shorter showers, running the A/C ...
3
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0answers
56 views

Are there any articles that describe to correlation between the forecast errors for renewable energy resources, depending on the distance?

In an article by Zhang et al., the authors describe how the (normalized) forecast errors of different renewable energy sources (like solar panels and wind mills) are correlated. To that end, they ...
8
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1answer
70 views

What should I do with coal that I have been given?

My wife and I recently moved from London to a lovely old cottage in the countryside with electricity, no gas and a wood-burning stove. We are incrementally improving insulation to make the house more ...
1
vote
3answers
131 views

Mindset change in developing countries

I've travelled a bit in Africa, Middle East, and Asia. What strikes me, in all of these places, is that often in the most poverty-striken areas, things that people look up to are big cars, and ...
4
votes
1answer
100 views

Energy saving “bonus” for apartment renters

I live in an apartment building with three units, but only one gas meter, one electric meter, and one water meter. As a result, there is no inherent incentive to save water and energy, and no fair way ...
4
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2answers
141 views

Being a sustainable Digital Nomad in a Van - First Steps

I am considering the purchase of a retrofitted Ford Transit with a Diesel motor to have a more flexible option for travel and accomodation. Since I aspire to reduce my footprint (and increase my ...
5
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2answers
66 views

Will customer preference drive adoption of energy storage the same way as EVs and solar power?

A recent blog post lampooned the fact that the International Energy Agency has under-estimated the growth of solar energy in every single one of their predictions from 1994 to 2016. In the electric ...
2
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1answer
97 views

How long will a 12V Koolatron compact cooler last with 12Ah battery?

I'm thinking of purchasing a Koolatron P20 compact cooler and this ExpertPower 12200 battery How long will cooler last with this battery at full charge? Is this the correct battery to use for this? ...
8
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1answer
191 views

Laptop nights: shutdown or sleep?

Assuming I use it all day long, should I shutdown my (recent) laptop every night and power it up every morning, or just let it sleep by closing it?
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4answers
230 views

Getting power from an innovative new mechanism

I am new to StackExchange and trying my best to stay within the rules. I have invented an efficient mechanism -- a rotating mass magnetically attached inside a closed loop (GB 2517244). I am ...
11
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2answers
201 views

Should I replace existing inefficient light bulbs?

Similar to this question (except that's about cars), if I can buy more efficient light bulbs than the ones I'm using right now, should I? Or is it better to wait until my current light bulbs expire, ...
7
votes
1answer
354 views

How much energy do wall outlets with USB waste when not actively charging?

In new buildings and homes I've noticed wall outlets with USB chargers popping up more and more: Answers at another question indicate that these outlets waste energy just like traditional chargers ("...
8
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2answers
214 views

How is per capita energy consumption related to increasing per capita wealth?

Has there been any global calculation of average increase in consumption of energy per increase of wealth per person? Has there been any such calculations/analyses. And could you perhaps tell us ...
7
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2answers
166 views

Is a pellet stove better than a wood stove?

When we found our house (we're not owners right now), there was already a pellet stove. I don't really appreciate it because it uses electricity (I don't know how much but we now depend on it) and I ...
3
votes
3answers
769 views

Is 3 phase electrical generation more efficient to utilize than single phase?

Is 3 phase power more efficient to generate/use? How difficult or complicated is it going to be to provide balanced single phase load(s) from a 3 phase service? (equipment & controls required) If ...
4
votes
1answer
71 views

How can I find out what a reasonable rate for installed solar is?

I'm looking to have a ~20kW grid-tied solar system installed at our property in Ontario, Canada. I've been searching and reading but am unable to find current (last year or two) data on how much such ...
4
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1answer
99 views

What is a good database containing wind speed and direction?

I am pursuing a science project involving wind power, and am looking for some data on wind speeds, directions, and ideally turbulence and shear. Do you know where I could find this? I would need to ...
6
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1answer
102 views

Does bio jet fuel have a positive energy balance?

This article which was recently trending got me thinking about biofuels: Alaska Airlines makes first flight using jet fuel made from trees. I am not familiar with the numbers for biodiesel, but I ...
7
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2answers
142 views

What are the incentives for energy companies promoting energy efficiency?

My hydro (electricity) bills always contain helpful hints on conserving energy: do laundry runs in the wee hours, favor LED over incandescent bulbs, etc. I'm sure many at the big-energy corporate ...
7
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2answers
266 views

Anything similar to GravityLight that can be readily purchased?

Ever since it was first mentioned in a popular news site, I've always been interested in GravityLight. But I've never been able to go to a store or a site and just buy it. Is there anything vaguely ...
3
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1answer
451 views

Can pumped water energy storage be combined with rainwater harvesting?

A recent question on what to do with harvested rainwater got me thinking about pumped energy storage systems. Since both systems require storage of water for later use, is there a cost-effective way ...
7
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2answers
887 views

Can I connect an inverter directly after an MPPT controller, with no battery?

Is it possible to connect a 12VDC to 220VAC inverter to the output of an MPPT solar charge controller, with no battery? This will be cheaper than having a full solar inverter, which can be really ...
12
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3answers
1k views

Is leaving the fridge door open for, say, 10 seconds a “big deal”?

To use an example, say I need to take out a carton of milk from the fridge, add some milk to my tea, then put the carton of milk back. There are two methods: Method A: Open fridge door. Take out ...
5
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1answer
102 views

Energy Efficiency vs. Reduced Consumption

Energy efficiency and reduced consumption are not exclusive. But is it possible that we focus too much on the former and not enough on the latter? To expand on my question, I live near a very ...
3
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2answers
137 views

Measure and compare energy consumption

does anyone know of a platform/forum where people measure and compare the energy consumption of their devices? I bought an energy metering plug, and now I can find out how much electricity my ...
3
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2answers
82 views

How to log wind statistics data

How can I log data from anemometers? Are there any anemometers with ability to log data for long periods of time? I want to collect data for about a year or two. What are the options? Which will be ...
12
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4answers
1k views

What is the most sustainable way of making coffee?

Which method of brewing coffee is the most sustainable? The criteria being: minimal waste, minimal energy (no matter where it's produced) I guess for the optimal solution it would be necessary to......
8
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3answers
149 views

Is pellet fuel a sustainable energy source in the way it's used now?

Pellet fuel is considered a sustainable energy source. But the way it's used now seems to produce air pollution which I think should not happen in case of sustainable energy source. So is pellet ...
8
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2answers
154 views

Would you save energy by heating the air in a shower stall so that you could use colder water?

It is refreshing to take a cool shower in hot weather. And for the sake of discussion, lets assume that one should be "comfortable" with temeratures when taking a shower. Considering that the vast ...
5
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1answer
365 views

Electrical usage data logging with wireless data transfer

Does anyone know of a wireless energy usage capture device, that one can attach to an appliance and find out the energy usage? I know that there are certain energy monitors that do the job to some ...
21
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3answers
3k views

Do USB outlets waste energy just like conventional wall warts?

It is widely known that most AC-DC converters (aka "wall warts") continually use electricity, even when no devices are plugged in to them. That wasted energy is often called "phantom electricity" or "...
3
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1answer
179 views

Can artificial lighting compete with horizontal agriculture?

Background In Professor Bugbee's presentation, he describes some drawbacks of vertical farming (VF) versus traditional horizontal agriculture. Most of Bugbee's arguments against VF hinge on grow lamp ...