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 LABEL
FOR CONSUMERS" by CLASP, ECOS, EEB and Topten, 2017 says:
Fridge energy consumption is tested and reported according to a norm (EN
62552:2013) that basically ...
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 range. An electric bicycle uses less watt-hours per kilometer.
The reason for electric unicycle using more energy is that it needs to continuously stay balanced....
tl;dr: fans are cheap and already pretty efficient, so an ENERGY STAR certification wouldn't do much to reduce energy usage.
ENERGY STAR provides a list of scoping reports with details of products that are not certified, but have been studied for certification. Portable fans are not on the list. However, we can look at the six "guiding principles" for ...
Others have already suggested low flow fixtures and reducing water usage, but here are a few other ideas, from least to most expensive:
Turn down your water heater. The U.S. Department of Energy recommends a setting of ~120 F / 50 C. Many water heaters are set at the factory to 140 F / 60 C, which can increase the standby losses (energy spent keeping the ...
To reduce the effect of the 2 cm gap under the door you could attach a door sweep.
Any gaps around the air conditioning unit in the window can be sealed with silicone sealant.
To reduce electricity consumption, ensure the air conditioner is the correct size/capacity for the room it is supposed to cool. An undersized unit will continuously operate and under ...
Here's a few things to try:
Increase the temperature setting on the Air con
Air conditioning units typically do two things: lower the ambient temperature, and remove humidity from the air. Depending on where you live the humidity can be a bigger factor in getting a good night's sleep than the temperature itself, as it exacerbates sweating and makes the air ...
TL;DR: power saving with a lid comes from the fact that you can use a lower power-mode on
your cookstove. Energy used to bring the water to the boiling point is roughly the same with or without the lid, energy saving occur after that point.
I'm afraid that the question and the current discussions are quite ambiguous on one capital point.
We can try to make back-of-the-envelope calculations here, or try to find research but I suggest you do your own because it is quite straightforward.
Just maintain a simple table with
volume brought to the boil
time required to bring to the boil
My guess it that after approximately 10+10 measurements you can calculate the answer.
If it is not ...
Efficiency numbers are, unfortunately, misused/abused by companies that manufacture and sell wood heaters.
"Combustion Efficiency" is not actually a direct measure of how much heat is produced by burning wood. It's a direct measure of "how completely (or cleanly) the wood has burned". A stove that has an 89.1% combustion efficiency burns 89.1% of all the ...
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 considerations to determine the best setting for your space.
How long will the space need heat?
The principal benefit of an oil-filled radiator compared to ...
To save water get a low flow shower head and when using the sink use the lowest flow rate of water. If possible, spend less time in the shower.
To use less water in the laundry, consider using the bath towels for a few days instead of using clean one daily.
For energy savings, if possible do not use a ventilation fan, instead, open the window whilst having ...
Stick a water meter on your shower and bath taps. This one looks adequate
I don't know what the optimal time to spend in the shower is, or whether a long hot deep bath is more satisfying than a long hot shower, its personal taste. But with a meter you can track how much water each uses and then weigh that against how much satisfaction or washing you get ...
You might be able to use some of the data from https://en.wikipedia.org/wiki/Energy_efficiency_in_transport — which includes figures for typical per-passenger efficiency, but not for freight. There are also over a hundred footnotes, which might get you to better numbers or approaches.
Also I'd check to see if the IEA has done anything in this area: they ...