8 votes

Domestic flywheel energy storage: how close are we?

Lets check the pros and cons on flywheel energy storage and whether those apply to domestic use (source): Compared with other ways to store electricity, FES systems have long lifetimes (lasting ...
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  • 456
8 votes

Lowering the heating thermostat at night: is it really worth it?

tl;dr: Yes, lowering the room thermostat at night will generally help save energy, assuming we are in the heating season (winter), rather than the cooling season (summer). Let's take two points in ...
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  • 14.6k
7 votes

Electrical usage data logging with wireless data transfer

It sounds like the Kill A Watt wireless might be what you are after. For more alternatives keep reading. There is another product line called the Watts-Up that has USB connections to computers on ...
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7 votes
Accepted

What is the impact of switching to smart metering?

There is very large uncertainty on this, and one should not attach much credibility to reports that do put a specific number on it. Early work suggested that easy availability of real-time energy-use ...
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  • 14.6k
7 votes

Domestic flywheel energy storage: how close are we?

Domestic flywheels are unlikely to happen for 3 reasons: They must be heavy to store significant energy. If you need a crane to install one at your house it’s never going to be super cheap, even with ...
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  • 71
5 votes

Domestic flywheel energy storage: how close are we?

We were looking into flywheel UPSes for my company and I read up on this a bit. Of note in recent developments: Instead of traditional bearings, they're using magnetic bearings to mostly eliminate ...
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  • 51
5 votes

What is the impact of switching to smart metering?

There is a very detailed and interesting document of the British Government (Impact Assessment DECC0009: "Smart meter roll-out for the domestic and small and medium non-domestic sectors") where the ...
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  • 1,482
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-...
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  • 3,745
5 votes

How can I use my own body as an energy source for greater environmental sustainability?

"Is there no significant consequence to how we use our bodies' own generated energy - from a resources sustainability point of view - or are there considerations one can put into use in terms of ...
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4 votes

How can I use my own body as an energy source for greater environmental sustainability?

To answer this portion of your question: "But what other ways can one use one's own body energy wisely, and in general what principles / themes can one explore to put it into practice? " You made ...
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3 votes

How would keystone pipeline affect nature?

The problem is not the pipeline itself. Large pipelines are standard engineering. The disruption is fairly short term. The problem is that it would make a ready market for Canadian Oilsand oil to ...
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3 votes

How to stop paint deterioration of inner side of roof

Moss takes a while to grow, but when it fills in it makes a beautiful interior or exterior wall covering. If the concrete has moisture that will actually help the moss grow without need of misting ...
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3 votes

Producing my own energy options in urban area with windows but no roof access?

Others have touched on this too, but if it's purely about economic or environmental concerns, then saving energy is better than creating new energy just to turn around and waste it. If you spend ...
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  • 321
3 votes

Lowering the heating thermostat at night: is it really worth it?

A long-term consideration is increased condensation from cooler air in the far corners of rooms, which encourages fungal colonies. These are bad for health and eventually expensive to treat. Keeping ...
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3 votes
Accepted

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 ...
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2 votes

Lowering the heating thermostat at night: is it really worth it?

is it really worth it.. can mean something else as well: During the wintertime: Lowering the temperature has (sometimes) a nice side effect - you will lose weight. The amount of heat given from the ...
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  • 39
2 votes

Lowering the heating thermostat at night: is it really worth it?

You should find the best time to lower/raise the thermostat. The more thermal inertia your house has (the better it is thermally isolated), the earlier you should lower the thermostat. The faster the ...
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2 votes

How can I use my own body as an energy source for greater environmental sustainability?

Foregon, I don't know where you are, but where I live, conserving body heat (especially at night) can be a big contributor towards reduced fossil fuel consumption. Many homes are heated with fossil ...
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2 votes

How can I use my own body as an energy source for greater environmental sustainability?

I see the human body as an energy consumer rather than producer. I would agree that controlling your diet (quantity and quality) will have energy benefit on the overall system by making him run ...
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  • 213
2 votes

Domestic flywheel energy storage: how close are we?

My knee jerk reaction: From what I know of mechanical systems, anything mechanical introduces losses due to friction in the form of heat, sound, and vibration. How would you even begin to use the ...
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2 votes

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

Another option: Generate single phase. Run your house on this. Wiring your electrical system is much simpler, and can be done by anyone who can read and understand the equivalent of "Alberta ...
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2 votes

Energy storage idea: Pumped hydroelectric storage in ocean using difference in salt content

It may be technically feasible. But in reality, for places that do desalination, it's never going to be economical, because there's already an easier way to do things. Storage on the grid is useful ...
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  • 14.6k
2 votes

What level of light intensity (lumens) do you need across a solar panel in order to obtain 15% energy efficiency?

What level of light intensity (lumens) do you need across a solar panel in order to obtain an energy-output to incident-light efficiency of 15%? This depends on the varying characteristics of ...
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1 vote

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

No, it is too tricky to handle for the general public. When it leaks ( not -if it leaks) , it will rise in a storage area and may reach explosive conditions. I once saw a brick wall blown out of a ...
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1 vote

Energy storage idea: Pumped hydroelectric storage in ocean using difference in salt content

The article you linked says that the salt content of the seawater released by the desalinization plant is increased by 20%, not that the effluent is 20% salt. This means that normal 3.5% salt seawater ...
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  • 1,027
1 vote

Energy storage idea: Pumped hydroelectric storage in ocean using difference in salt content

This all seems highly inefficient. Your one calculation based om m*g*h is meaningless, g is not 9.8 here. You have to displace the sea water which is almost as dense as the saltier water you want to ...
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1 vote

Domestic flywheel energy storage: how close are we?

TL:DR: They extend the life of expensive UPS batteries by absorbing the transients. Example: Hosptial with an MRI Engery surge on start up with UPS graciously assisting. The MRI fires up 10 times a ...
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  • 11
1 vote

Domestic flywheel energy storage: how close are we?

TL;DR - Because of how flywheel energy storage scales it is unlikely that significant efforts will be made to develop the technology for home use. This is similar to the case for windmills, where ...
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  • 11.2k
1 vote

What are the incentives for energy companies promoting energy efficiency?

They're mandated and/or sponsored by government. The companies are slightly motivated to use this money well to appear as friendly, neighbourhood, we-have-your-interests-at-heart companies, i.e. ...
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  • 159

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