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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 circle. Here are four that I just dug up in my house: These indicate energy efficiency standards for EPS starting with the California Energy Commission in 2004 (...


5

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 it isn't. If you consider a place that's very cold, so cold that there's snow, usually there's a reason for that. The reason being that it's winter season and ...


3

Human is quite an energy-efficient, kinda. if I remember correctly - pro bicycle riding on a closed track exercise about 0.5kwatt for about an hour - those are pro guys (there was some video on youtube about that) and not pro guys they will have a hard time being even close to that. if one is just in a good shape it is not enough. the electric car spends ...


3

This is simply a fancily designed chain of cities based on the about 40 years old idea of the "compact city". The idea is to reduce urban sprawl, reduce traffic and improve living conditions. Each link of the chain in itself will be not self-sufficient, but provide all necessary (daily) needs to its inhabitants, including doctors and if not a ...


2

10 CFR 430.32 - Energy and water conservation standards and their effective dates is the U.S. government standard defining (among other things) how energy consumption of refrigerators is to be tested. The standard references the test procedure AHAM HRF-1-2008, developed by the Association of Home Appliance Manufacturers, an association which "is an ANSI ...


2

According to the manual, the Kill-A-Watt is calibrated to accuracy within 2%, with 0.5% being typical. In contrast, any conventional electrical load which you might have in your house won't be calibrated at all. It will have some maximum current limit, but beyond that, even for the same product, the actual load might vary by as much as 10% -- there's simply ...


2

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 the released mercury would be problematic. If that were to happen contact the waste disposal department of your local municipal council and get advise because ...


2

A "city" implies people. Lots of people. Those people need to eat. Food generally is purchased at (super)markets and grocery stores. It usually is delivered by trucks. No roads means no trucks means no markets means no food means no people means no city. I see a teeny, tiny problem with the plan, don't you? Of course, one can transport and ...


2

Put the broccoli in a microwave safe bowl with a few tablespoons of water, cover the bowl with a microwave safe top (ideally maybe a glass lid, but if plastic, don't let it touch the food!). Then microwave it. Guaranteed less energy, and you don't lose significant nutrients into the water you'd be boiling it with either of the other two ways.


1

Since I ate a lot of food, I asked to myself if maybe a train (dividing cost between all passenger) was more green than me! A train typically uses electricity. The emissions of electricity on the greenest grids are typically around 50 g / kWh produced. In the near future I think we can even reach zero with hydrogen energy storage and renewables. However, a ...


1

If we compare the cost of solar/wind renewables vs fossil fuels, both Without subsidies, what is cheaper? You have to understand the different roles of different power sources. Coal is old-fashioned and dying. Traditional coal power plants have poor thermal efficiency, and alternatives such as integrated gasification combined cycle are expensive. Coal has ...


1

@jmk yes the Seasonal energy efficiency ratio or SEER a high number is better. The system won’t let me comment must be because I am new on this page of the SE . There are similar questions asked on DIY home improvement. Basically the outside unit is the compressor and condenser coil. The inside unit could be a very basic coil and orifice and your system ...


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The environmental impact potentials were evaluated based on the metal contents and masses of the drives and environmental impact characterization factors used in life cycle impact assessments. The SSD had 86% to 94% lower resource depletion potentials than the HDD, due primarily to the lower contents of Au, Cu, Pd, Ru, and Pt, whereas the SSD had 33% higher ...


1

Since the water heater is not on an exterior wall, it is likely that the pipes you mention which do pass through the exterior wall would freeze before pipes inside the heater do. This would cause damage, of course, but might spare the heater. Addressing the issue with pipes freezing, there's an interesting discussion over on HomeImprovement.SE: "What is ...


1

tl;dr: heat pumps are widely used for swimming pools, can probably be used for hot tubs, and should work reasonably well in your climate. Swimming pool with cover I couldn't find good information on hot tubs, but I did find that the U.S. Department of Energy has this page on heat pump water heaters for swimming pools. Then, a quick search suggests that ...


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