Register to reply

Unit conversion

by Young Learner
Tags: conversion, unit
Share this thread:
Young Learner
#1
Feb9-13, 11:30 PM
P: 41
Today I came across a statistical report of world energy consumption. There was a tab named energy generated and the values were given in TWh. There was a tab named Primary energy consumed and the values were given in Mtoe. I saw that the energy generated by the world is around 20000 TWh and the Primary consumption is around 12000 Mtoe.
My questions are:
1. Why is that the Energy generated and the energy consumed are expressed in two different terms?
2. I came to know that 1Mtoe=11.63TWh, the 12000Mtoe=139560TWh. How come the consumption is so high when the generation is only 20000TWh
Phys.Org News Partner Engineering news on Phys.org
Comfortable climate indoors with porous glass
Crash-testing rivets
Customized surface inspection
NascentOxygen
#2
Feb9-13, 11:41 PM
HW Helper
Thanks
P: 5,166
Would coal and oil be classified under "Energy Generated"?
Young Learner
#3
Feb10-13, 08:01 AM
P: 41
Does that mean 12000 Mtoe is burned to produce 20000 TWh of energy?

NascentOxygen
#4
Feb10-13, 08:17 AM
HW Helper
Thanks
P: 5,166
Unit conversion

Where would the fuel burnt in motor vehicles be categorized in these statistics?
Young Learner
#5
Feb10-13, 08:38 AM
P: 41
Do you mean that they have specified the primary fuel consumed which also includes the fuel used for transportation.
That was an electrical energy statistics report
NascentOxygen
#6
Feb10-13, 09:06 AM
HW Helper
Thanks
P: 5,166
That is my interpretation, though based on scant information. Otherwise, the conclusion is that only 1/7 th of the fuel is converted into electric energy. Maybe they take into account the energy used in mining and transporting the coal, including that as primary consumption?
Young Learner
#7
Feb10-13, 09:37 AM
P: 41
I was not able to upload the entire file. So, I just cropped it.
Just see whether you'd be able to come to a conclusion from the following data
Attached Files
File Type: xls stats.xls (27.0 KB, 1 views)
D H
#8
Feb10-13, 09:50 AM
Mentor
P: 15,067
Wikipedia indicates that world production of electrical power in 2008 was 20,261 TWh while world consumption of energy was 143,851 TWh (12,369 Mtoe). These numbers are consistent with the values specified in the opening post. A better label for that "energy production" tab would have been "electrical power production".

Does this mean that only 1/7 of the world's energy annual consumption is used for the purpose of generating electricity? No. Actually it's about 36%. Power plants aren't 100% efficient; the second law of thermodynamics gets in the way. A good chunk (61%) of the energy consumed in the production of electricity is turned into heat rather than electricity.
Young Learner
#9
Feb10-13, 10:03 AM
P: 41
Fine, I understand. Just one clarification, Does the consumption of energy includes renewable energies such as hydro and tidal or it is just confined to coal and oil.
NascentOxygen
#10
Feb10-13, 07:44 PM
HW Helper
Thanks
P: 5,166
Unless the document indicates they excluded some energies, I expect it would be an estimate of energy from all sources.
Young Learner
#11
Feb11-13, 07:20 AM
P: 41
Thank You all for the instant replies. :)
jim hardy
#12
Feb11-13, 12:35 PM
Sci Advisor
PF Gold
jim hardy's Avatar
P: 3,519
Since you're interested in the subject, here's a link i enjoyed.
It's from 2007 when world use was about a cubic mile of oil per year. They try to put that in some perspective.



http://www.theoildrum.com/node/2186

It leads to to other interesting links..
Young Learner
#13
Feb12-13, 08:10 AM
P: 41
Informative thread Jim.


Register to reply

Related Discussions
SI unit conversion HELP Introductory Physics Homework 5
Unit Conversion Introductory Physics Homework 1
Unit conversion Introductory Physics Homework 4
Unit conversion Introductory Physics Homework 2
Unit conversion help Introductory Physics Homework 4