Did you know ? Questions answers ecology and energy.

[pluesy]

ps: another question "did you know?"

"When you use a liter of fuel in your vehicle, it is as if you had heated the atmosphere with this liter of fuel because all the energy resulting from combustion ends up transforming into heat. A vehicle which advances heats up l 'air."

Your opinions ?

my opinion the vouallaa !!!

if the people eat 5 l to 100 with a liter it will run 20km if we assimilate it to a parallapipede of 5m x 2m x 1m ca about 30 m2 which rubs in the air! (10m2 above, 10m2 below and 10m2 on the sides) therefore over 20 km the car will have rubbed about 120 m000 of air and it will have distilled in air via this surface in friction about 2 kwh (engine efficiency 2% ) and 20kwh in pure thermal especially concentrated on the underside (extraction of air from the radiator plus exhaust)

if we could recover this waste heat via a steam turbine or a stirling efficiency 50% mounted on the rear wheels the efficiency will be tripled and the consumption divided by three

in conclusion, the car over 20 km provided 10 kWh of heat in 12 min (if it travels at 100 km / h) on a surface 40 m000 (2 x 20 or 000 ha ...) on the same surface 2 min from full sun will give 4 kwh or 12 times more !!!

so on a road that has a speed of more than 800 cars per hour (1 car every 4.5 seconds) it heats up more than the sun ...

conclusion (re) if you want to be warm in winter build your house over a highway and above all be careful to insulate the floor !!! free underfloor heating guaranteed !!!

[denis]

of course it warms the atmosphere !! we are having trouble with the water and oil radiators on all the heat engines !! without taking into account the heating of the tires and the friction of air
for torpedoes it smells like MHD , view on the jpp site

[Philippe Schutt]

another "did you know"

The energy lost during the production of electricity in France is more important than the consumption of oil!

[denis]

not surprising! considering the considerable heat that the nuclear power plants evacuate, just that is a big%

[innuend0]

Would it be complicated to install propellers in the towers of a power plant to recover energy ???

I do not understand why this is not done ... if the energy lost in the form of heat is so important, recovering it should be profitable ...

(ps: I don't know anything about nuclear power plants)

[Christophe]

Here I started to integrate some Question / Answer to the site:
https://www.econologie.com/c-est-quoi-l- ... -3226.html

[einstein30]

Hello, the output of a nuclear power plant corresponds to the activity rate at nominal power for 263 days per year, (on average) the rest of the year is reserved for maintenance and refueling; the yield = 72%; Regarding the refrigeration towers, there is not one per reactor; first, the 16 reactors built by the sea do not have one (discharge into the sea 500 m from the coast); some reactors operate in open circuit, therefore discharge into the river (6 reactors); 2 reactors operate with 2 towers each; one site operates with 4 reactors and 2 cooling towers; the others operate in a closed circuit, recovery of water after condensation in the towers; therefore the information mentioned above is erroneous and fanciful. SLT

[Christophe]

Fanciful do you say? For me it is above all what is:

the yield = 72%

Apparently you confuse performance and load factor ...

More info here: https://www.econologie.com/forums/equivalenc ... t5501.html

[dirk pitt]

christophe, you did not do EDF in second language!

load factor, that means efficiency for them !!

That said, there are a thousand ways to define efficiency: do we count it, compared to PCI, PCS, input energy, primary energy, etc ...

[bobono]

Did you know .

The cost per kw of energy produced and returned to housing.

For example . 1 liter of fuel with a boiler) 80% efficiency cannot be compared with an oil stove or 100% of the heat remains in the room.

It is the pellet that comes out of this comparison.