Unanswered Questions
156 questions with no upvoted or accepted answers
6
votes
1
answer
48
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Is thermal heating of soil contaminated by coal gasification plant safe in a built-up zone?
Where I stay, theres a site (see intro here) nearby that used to be a coal gasification plant (produces coal gas for lightning etc.). The plant contaminated the soil with PAHs and heavy metals with ...
CommunityBot
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5
votes
0
answers
34
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Which part of the process of estimating wind resource has the potential greatest benefit from further research?
Estimations of the potential generation resource of wind power happens at all scales from very coarse global estimates, to detailed estimates at individual sites based on specific locations and ...
- 14.8k
5
votes
0
answers
258
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What are the advantages and disadvantages of using lidars over sodars for wind resource assessment?
The process of wind resource assessment has used a variety of methods over the years; more recently, lidar - radar-style sensing using lasers; and sodar (similar, but using sound) have come to ...
- 14.8k
4
votes
0
answers
48
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Why hasn't the percentage of renewable electricity grown in Germany this year?
A large German newspaper, Die Zeit, has been showing a daily-updated energy infographic on its front page for a few years now. Today, in the summer of 2024, the graphic looks like this:
see * if you ...
- 14.6k
4
votes
3
answers
232
views
Does the 15 minute city concept have an answer to the two body problem?
The 15 minute city is defined by wikipedia as:
The 15-minute city (15mC) is an urban planning concept in which most daily necessities and services, such as work, shopping, education, healthcare, and ...
CommunityBot
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4
votes
0
answers
69
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How "eco" is the (3hr+) Eco mode on dishwashers
Our domestic dishwasher has an "Eco" mode that takes around 3.5 hours to run. I presume that the time includes lots of resting time to allow the contents to soak.
However, I find it very ...
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4
votes
0
answers
96
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Radiative Cooling for Residential
I've seen a lot of references to films which radiate heat from an underlying surface out into space. For example:
http://radi-cool.com/
https://arpa-e.energy.gov/technologies/projects/passive-...
- 91
4
votes
0
answers
52
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Can mealworms form part of a healthy diet in the UK?
Mealworms for birds are a cheap form of nutrition. Could they be processed at home in a way to make them healthy?
Dried mealworms are sold as bird food for just under £8/Kg in the UK or $3/Kg from ...
- 141
4
votes
0
answers
74
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How much CO2 is currently captured in the EU per year with CCS technologies?
I wonder how much carbon dioxide is captured per annum in the EU at the moment. In this article (p. 5), one can read that the two largest CCS facilities in Europe currently capture around 1,55 Mt/y. ...
- 191
4
votes
0
answers
166
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Are talcum powder tins more sustainable than the ones that come in plastic boxes?
I was shopping and as a trial, I bought a talcum powder in a tin container instead of the usual ones that comes packaged in a plastic box. The material looks like a tin, although one cannot tell from ...
- 741
4
votes
0
answers
75
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Any sustainability difference between anionic/cationic/nonionic detergents?
Are any of these three types of detergents more or less damaging to manufacture and/or use or dispose of than the others?
I realise these are rather broad classes, but this is usually the only detail ...
- 1,082
4
votes
0
answers
47
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Pond for largemouth bass / perch
In NE Ohio (Zone 5 - 6) how large of a pond would I need to raise largemouth bass or perch for food production.
What is the minimal depth and diameter required for 100 fish?
- 14.6k
4
votes
1
answer
161
views
Is using multiple MPPT controllers with a solar panels array, to mitigate effect of shadows a myth?
So my installation is for a sail boat. There's a lot things like rigging sails etc, that can create shadows on part of the array and this is constantly moving around. Some panels in the array will ...
- 12k
4
votes
1
answer
53
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Large-scale test data on LED, CFL, and incandescent brightness and longevity
A google search for "comparing LED, CFL, and, incandescent brightness" returns hundreds of charts showing what equivalent wattage of LEDs and CFLs are to match an incandescent bulb. This is fine for ...
3
votes
1
answer
111
views
CO2 emissions for a satellite
How much CO2 emissions would producing an LEO satellite (e.g. Starlink satellite) release? I imagine there are various factors that go into this (aluminum body, electronics, battery, solar cells, etc.)...
CommunityBot
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