Questions tagged [energy-efficiency]
The percentage ratio of energy produced to energy supplied to a system; or a measure of minimum energy required relative to energy actually consumed; or a measure of relative energy consumed to provide the same energy service.
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Do smart meters raise privacy and radiation concerns?
Frankly, I have some concerns about my newly installed smart meter. There are two main issues:
Privacy: It collects data every minute. Will the power company know when anyone is home or when I'm ...
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How many solar panels should a beginner install?
I have been living in a fairly isolated house for about 7 years now and am seriously considering installing some solar panels. Recently I have also become interested in all the topics of ...
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Will 2 separate solar panels, identical except different solar-efficiencies, produce same output?
I can't figure this out to confirm, from definitions of solar-efficiency (examples there don't specify rated wattage):
Will two separate solar panels that are identical (including rated wattage), ...
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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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Measuring Home Heat Loss
I am interested in testing/measuring my house to see how leaky it is and how bad the insulation is. If my house is poorly sealed and insulated then I will know how to improve it and I can retest it ...
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For Electric vehicles, HOW are miles per gallon equivalent (or L/100 Km) calculated, accounting for different sources of energy in the grid?
Could someone giver a clear and authoritative answer on HOW miles per gallon equivalent (or L/100 Km) are calculated for Battery electric Vehicles like Tesla Model 3 AWD long range? On the Electric ...
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Is it inefficient to turn off the airconditioner for short durations of less than two hours?
I was recently recommended not to turn off the airconditioner (A/C) when leaving a room for two hours or less but instead to increase the temperature setting closer to the outside temperature. The ...
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Estimating real, overall efficiency of an air conditioning unit
I want to research into electrical consumption of air conditioning units. While trying to make a rough estimate of efficiency, found that the btu/h capacity of the specifications does not make sense ...
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What 'average' conditions are used to test the energy usage of freezers for a EU energy label?
I'm orienting myself on buying an extra (small) freezer on top of the limited amount of freezer space I already have in my fridge/freezer combination, so I can more easily cook and store fresh produce ...
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Are there toasters with a selector for one or two slices?
I noticed that all toasters I could find (even the ridiculously expensive ones, 300 Euro/dollars) toast both slots at the same time, instead of offering a selector one/two.
The closest I could find ...
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Why not use condensate from a split-unit air conditioner to improve cooling efficiency?
This is bugging me to the point that it almost enrages me.
A split-unit air conditioner would typically cause condensate to form in the indoor unit. This water can be simply drained with gravity ...
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Is it more energy efficient to ventilate a home with an HRV/ERV or “shock-ventilation”?
In a reasonably cold climate like Hamburg, Germany where the standard practice is to open all your windows in the winter for up to 20 minutes once a day to ventilate your home (Stoßlüften or “shock-...
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Is PEX piping more energy efficient than copper?
My house has two bathrooms, with roughly the same distance of pipe from the water heater to each (see diagram below). One was added during a renovation and has PEX piping from the point where they ...
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Meta-campaigns for sustainable building management?
(Sorry if this is the wrong place to ask this. I considered politics--maybe that is better.)
I have seen various groups that try to set up small campaigns targeted at individual organizations to ...
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Do solar panels generate more electricity in hot or cold climate?
Do solar panels generate more electricity in hot or cold climate? Who is right (sorry for the messiness, I currently don't know how to take a long screenshot)?
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