Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

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]

3
votes
2answers
37 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 ...
3
votes
2answers
100 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
votes
3answers
98 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
votes
1answer
38 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 ...
4
votes
1answer
131 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
121 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 ...
14
votes
2answers
91 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
votes
3answers
61 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
votes
3answers
90 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
votes
0answers
28 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 ...
7
votes
1answer
64 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
119 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
92 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
votes
2answers
137 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
votes
2answers
63 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
votes
1answer
81 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? ...
7
votes
1answer
186 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?
-5
votes
4answers
226 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 ...
10
votes
2answers
185 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, ...
6
votes
1answer
300 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
votes
2answers
147 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
votes
2answers
159 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
641 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
70 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
votes
1answer
96 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
votes
1answer
86 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
votes
1answer
111 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
votes
2answers
226 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
votes
1answer
372 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
votes
2answers
801 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
votes
2answers
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
votes
1answer
100 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
votes
2answers
133 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
votes
2answers
74 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
votes
4answers
948 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
votes
3answers
144 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
votes
2answers
147 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
votes
1answer
353 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
votes
3answers
2k 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
votes
1answer
172 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 ...
2
votes
0answers
63 views

How effective are “GreenUp” (opt-in utility company green energy) programs? [duplicate]

My local Seattle utility offers a "Green Up!" program where customers can pay extra on each bill to buy energy from more renewable sources. I'm signed up to contribute at the highest level ($12/month),...
3
votes
1answer
353 views

Should I leave water in a water boiler for prolonged periods?

When I fill my electric water boiler with water some time before boiling it, the water gets warmer, it's temperature get closer to the room's temperature, saving some energy. On the other hand, I've ...
2
votes
2answers
78 views

Is there a way to tell (or estimate) the electricity consumption of an arbitrary household item?

I often wonder how much energy a given item in my home is using. Examples include: the clock on my microwave my espresso maker an electric water kettle my phone charger (when no device is attached) ...
7
votes
3answers
2k views

Why the world is using non renewable resources?

According to Wiki, A renewable resource is an organic natural resource which can replenish to overcome usage and consumption, either through biological reproduction or other naturally recurring ...
3
votes
1answer
210 views

How much energy could we save if we all got up at sunrise

Just had a thought: How much energy could be saved if everyone got up at sunrise? Perhaps it would have a counteractive effect somehow but my thought is that if you're up less during hours that it's ...
26
votes
7answers
15k views

What to do with old, unused incandescent light bulbs

Over the years, my family has built up a small stockpile of incandescent light bulbs. More recently, we have been replacing our incandescent lights with more energy-efficient alternatives. ...
5
votes
1answer
67 views

Is there an “energy returned on materials invested” index for energy sources?

We already try to measure how much energy is invested (EROEI) in the production of energy, but I have a hard time finding numbers on the materials invested. For example: What is the total energy a ...
7
votes
1answer
75 views

What is the carbon footprint of energy transfer across power lines?

I've been doing some reading up on the full cycle carbon footprint of energy production and consumption, and realising there's a lot of aspects that are frequently overlooked. One of these I'm ...
2
votes
2answers
254 views

Less energy consumption when we stop using fossil fuels?

What's the best way to find out how much less energy we would use if we would quit fossil fuel usage altogether? What would be the percentage entailed? I know it's easy to find out with electrical ...
5
votes
2answers
107 views

When transporting high-end food stuff from Chita to Moscow, which method is more fuel efficient, by rail or by air?

Chita is a Russian city nestled between Mongolia and Manchuria. Although Chita is located on the trans-siberian railway, I wonder if it is more energy efficient to ship 100 tons of cut beef every day ...