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]

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7
votes
2answers
172 views

Is canned fish more sustainable than fresh?

I read this beauty-oriented article claiming that canned fish is more sustainable than fresh fish. Is this true? Listed below is a brief energy/sustainability brain dump on the subject. Canned fish: ...
7
votes
4answers
1k views

Gas/cooling strategies for reducing fuel consumption while driving: air conditioner vs windows

Looking at gas milage and air conditioner use, it seems to me I get a significantly better gas milage when I don't use the air conditioner. However, if I roll down the windows, I assume this ...
10
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1answer
798 views

Is opening windows wide or opening them slightly more efficient for exchanging air in a room on a cold day?

For those who wish to replace the air in a room during a cold day with active heating: Given that the purpose of opening the windows is to exchange as much of the air in the room as possible with the ...
9
votes
4answers
171 views

Retrofitting insulation in a 4-storey home. Top down or bottom up?

I'm faced with the prospect of wanting to improve the insulation of a 4-storey Victorian (c1890) house in the UK that has solid stone walls and a top floor that is within the non-insulated roof space. ...
25
votes
5answers
4k views

Does a dishwasher save water in the long term?

I've been considering a dishwasher, but there are a range of different opinions on if they save water (or even energy) or not. Do we have any sources one way or the other?
11
votes
1answer
151 views

Independent retirement vs moving in with the kids

Living in Indonesia at the moment and under long-term discussions regarding whether to move back to the US. One issue is retirement and one aspect of that is sustainability. In Indonesia, multi-...
19
votes
2answers
3k views

Meat or fish, which requires more energy to produce?

In general it is assumed that the energy that is required to produce a certain type of food is a good surrogate for the total environmental burden of food products. I scanned some studies to compare ...
4
votes
2answers
188 views

Challenges of providing sustainable energy sources to meet future demand in Ireland

what are the main challenges Ireland faces as regards providing sustainable energy sources to meet future energy demand?
1
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2answers
480 views

Can an enclosed Pelton Turbine be used as a pump?

Can an enclosed Pelton Turbine be used as a pump, perhaps through the centrifugal forces created in a enclosed Pelton Turbine when it rotates at speed? The water striking out of the buckets of a ...
10
votes
2answers
2k views

How much energy does it take to create a single light bulb?

This question is a part of this question. Perhaps it is better suited on the physics SE, but here goes. I would like to know how much energy it takes, in the modern world, to construct an ordinary, ...
6
votes
1answer
198 views

Should payback periods take the time value of money into account?

I am currently reviewing a paper estimating the payback period for different building renovation strategies. The calculations I see typically go something like this: you pay (say) USD 3000 today, ...
12
votes
4answers
317 views

Water heating / electricity production by using earth's warmth?

I'm very curious, why hasn't anyone done this? In most places on earth, the temperature gets 25 degrees higher (celsius) for every kilometer in depth. How hard would it be to drill 4-5km, put a U-...
13
votes
2answers
465 views

Tea in the microwave

I occasionally need exactly a cup of water boiled for tea. Whenever I boil the kettle to do so, I wonder if it would be more energy efficient to use the microwave, as then I would have exactly the ...
5
votes
1answer
108 views

What are the sustainability impacts of requiring more and more years of education?

As time has gone on, education requirements to meaningfully have a career has increased incrementally over time. This is true across virtually all fields. This means that we start careers later, are ...
5
votes
2answers
435 views

How to monitor energy use in existing office building without submetering?

Our office occupies one floor of a 4-story hundred year old building. We are making tenant improvements to our space, and are interested in lowering and monitoring our energy use, but are unable to ...
11
votes
3answers
267 views

Are there projects that use renewable energy sources to create renewable energy sources?

I recently fantasized about a project that starts from a small solar furnace (small, but can melt steel), and a small solar farm (that control the electronics). Then all the energy is used to build ...
6
votes
2answers
453 views

Would we come to a period of no oil within our lifetime? If so, should we prepare, and how? [closed]

I mean to ask, in order to know, for example, whether someone today should be learning/preparing to lead a post-oil life? i.e no new plastic products, gas-powered vehicles, petrol-generated ...
22
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2answers
177 views

Do “100% renewable” electricity plans increase renewable electricity production?

In the advertising for this year's earth hour in Sydney, Australia, it encourages people to switch from conventional electricity to renewable energy. A number of electricity providers offer "100% ...
18
votes
3answers
7k views

Storing food without refrigerator during the winter

I am unplugging my refrigerator for the winter months, I live in the northern United States so the temperature is sub freezing most of the time during winter. I have a semi-insulated garage that is ...
7
votes
1answer
139 views

How “clean” is this Ohio State clean coal technology?

Much is being made of the clean coal breakthrough announced at Ohio State this week. The effort utilizes an innovative process called "chemical looping." Typical coal-fired power plants burn coal ...
20
votes
1answer
2k views

What's the typical energy usage of automatic light switches?

A good way to cope with forgetting to turn of the lights is automatic light switches. But they must be using some energy to do their job. What's the rate of energy use for a typical automatic/sensor ...