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15 votes

Are plastic cups more environmental friendly than ceramic mugs?

It's correct that the production of 1 ceramic mug requires much more material and energy than the production of 1 plastic cup, but this isn't a fair comparison. Plastic cups are generally used once or ...
THelper's user avatar
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12 votes

Are plastic cups more environmental friendly than ceramic mugs?

You've pictured a disposable plastic cup. If you assume that you can use it a few times, then you might consider that you get through one a day. A ceramic cup lasts until you drop it. The cup in your ...
Chris H's user avatar
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8 votes
Accepted

How much energy would it cost to stabilize 2 tons of water at 70 degrees?

The stabilisation energy rate will be exactly exactly equal to the rate at which energy is lost. Assuming the tank is closed, so there are no evaporative losses, there are two other ways energy is ...
410 gone's user avatar
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8 votes
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Does transporting plastic offset the benefits of recycling it?

tl;dr: No, shipping plastic waste to China for recycling does not offset the benefits, as it reduces the net energy savings by 3% or less. Polyethylene, The most common plastic According to ...
LShaver's user avatar
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8 votes

How to ensure you are using efficient chargers for cell phones, laptop computers, and other electronic devices?

Power ratings -- choose level VI Take a look at any external power supply (EPS) you have lying around -- you should notice, along with all the regulatory markings, a roman numeral I through VI in a ...
LShaver's user avatar
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7 votes

How to choose between an electric, natural gas, or heat pump clothes dryer?

You need neither a tumble dryer nor a drying cabinet. I haven't used either for years, and we are a two person household in a 36m² studio apartment in England (so winters are rather humid). By far ...
gerrit's user avatar
  • 2,649
6 votes

Anything similar to GravityLight that can be readily purchased?

The big advantage of GravityLight is that you can pull the weight once and then you have electricity for a relatively long period (I read somewhere it's 30 minutes). This is ideal when you need to ...
THelper's user avatar
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6 votes
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How much, if any, does resolution effect the net power consumption of watching online video?

The Natural Resources Defense Council commissioned a study in late 2015 to understand the energy consumption from 4K TVs, titled The Big Picture: Ultra High-Definition Televisions Could Add $1 Billion ...
LShaver's user avatar
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6 votes
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For overnight heating, is it more efficient to use an electric space heater in a bedroom or a whole house natural gas furnace?

In terms of energy-efficiency within your own home (i.e. when we ignore energy losses outside the home), it will almost certainly be more efficient to use the electric space heater. It will be close ...
410 gone's user avatar
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6 votes
Accepted

Do solar panels generate more electricity in hot or cold climate?

If the amount of radiation stays the same, solar panels produce more energy when they are cooler. Heat causes efficiency to suffer. However, this is assuming the radiation amount is the same. Usually ...
juhist's user avatar
  • 5,089
5 votes

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

I'm going to assume you'e in the USA since you're using Imperial units. 1) Is 3 phase power more efficient to generate/use? In bulk, yes. Three phase (or sometimes 6 phase/3 phase 220V in low-...
Móż's user avatar
  • 3,934
5 votes

Most cost effective heated flooring?

It will depend on your local cost of fuels and of equipment. The most energy-efficient way to do it would be to have a ground-source or water-source heat-pump that fed your under-floor heating. ...
410 gone's user avatar
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5 votes

How much energy am I harvesting?

Energy in the pumped water 54 gallons is about 200 L, equivalent to 200 kg 30 feet is about 9 m Using the formula @JanDoggen mentioned: m ⨉ g ⨉ h = (200kg)(9.81m/s²)(9m) ≅ 18,000 kg*m²/s² This is ...
LShaver's user avatar
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5 votes
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Keep my hands warm while working on a laptop?

I use a pair of wool fingerless gloves. They don't impair dexterity and even though they leave fingers exposed they cover enough that my entire hands remain comfortable.
Jean-Paul Calderone's user avatar
4 votes

How much gas does it take to heat water from 15 to 60 degrees C?

The amount of energy needed From EnergyNumber's answer to the electricity version of this question: ...the energy needed is 180,000 x 45 x 4.2 = 34 MJ 1kWh = 1000W x 3600s = 3.6 MJ Hence,...
LShaver's user avatar
  • 11.9k
4 votes

Most cost effective heated flooring?

The most cost effective and energy efficient heat is the heat that you don't lose through the envelope of your house. Look at the whole house system and consider whether improving insulation (in the ...
Jean-Paul Calderone's user avatar
4 votes
Accepted

Is this discrepancy between energy label and measured values reasonable?

The discrepancy you find is about 30 %, and is probably in the range that you have to expect. The Report on a fair energy label for consumers "CLOSING THE ‘REALITY GAP’ – ENSURING A FAIR ENERGY ...
cbeleites unhappy with SX's user avatar
4 votes
Accepted

Lowest energy use per passenger-km, electric bicycle or electric unicycle?

A two-wheeled electric scooter / bicycle uses less energy. You can take a look at the specifications of two-wheeled electric scooters and electric unicycles. Look at the battery size and the claimed ...
juhist's user avatar
  • 5,089
4 votes
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What is the most efficient setting on my oil-filled radiator?

Efficiency of the heater Like most space heaters, an oil-filled radiator uses resistive heating, which is greater than 99% efficient at converting electric energy to heat. But there are a few other ...
LShaver's user avatar
  • 11.9k
4 votes
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Can I use a "normal" thermometer in a refrigerator?

A properly made normal thermometer will function perfectly well in a refrigerator, as you describe. As with all mercury based thermometers be careful not to break it. Cleaning up and then dealing with ...
Fred's user avatar
  • 3,507
4 votes
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Efficiently freezing an ice pack once per 48 hours

Some years ago I read of an off-grid farmstead in Australia that used a conventional chest freezer as a refrigerator. The way he did it was to use a probe and temperature controlled relay to turn the ...
Sherwood Botsford's user avatar
3 votes
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Cookware thermal isolation

There is cookware that uses insulation for cooking, not quite in the way you envision, but close enough. I'm referring to a cooker Thermos Shuttle Chef, popular in Japan (as シャトルシェフ). It's an ordinary ...
Earthliŋ's user avatar
  • 5,994
3 votes
Accepted

Are building certificates under EU Directive 2002/91/EC, such as EPC, Energieausweis, DPE, directly comparable between EU countries?

No. The letter rankings cannot be compared between nations in the EU, as each nation has a different number of grades (or no grades at all). From "A comparative analysis of the energy performance ...
LShaver's user avatar
  • 11.9k
3 votes
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How to regulate temperature at home with windows and blinds?

During summer, the first thing you would want to do is to limit the amount of sunlight entering the windows when the sun is shine on each side of the house. If you can put something on the outside of ...
Fred's user avatar
  • 3,507
3 votes
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Why isn't STES (Seasonal thermal energy storage) more popular?

Pretty much any and every energy system needs lots of storage - either real, or virtual in the form of demand-side response. The old energy system, the one we inherited, had absolutely vast amounts ...
410 gone's user avatar
  • 14.7k
3 votes

What exactly is Potential Induced Degradation in PV panels?

In very simple terms, current leaks from the solar cells to the structure of the panel. This happens when a combination of heat, water and the generated electricity cause the material the panel is ...
Móż's user avatar
  • 3,934
3 votes

What form of electrical lighting has the smallest energy-footprint?

There is a lot of efficiency variation that depends on the quality of the LEDs. Cheap LEDs are no better than CFLs. High quality LEDs from brands like Cree or Philips can be over double the ...
John Spence's user avatar
3 votes

What is the relationship between permaculture and sustainability?

I think this is a very good question which is quite a challenge to permaculture. The answer depends on what it is you are trying to sustain. My understanding of the aims of permaculture is that it ...
rowan eisner's user avatar
3 votes

More sustainable pick-me-up: can of coke or cup of tea/coffee?

TL;DR -- The best option, per liter, is tea. Soda is about twice as "bad," and coffee is two times worse than that. To compare the environmental impact of various beverages we need to perform a life-...
LShaver's user avatar
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