Appendix 1 - Reidar Conradi (Ed.):
Some Common Energy Terms - per Oct. 27, 2007
Energy Units, American Physical Society (APS), 2011 (.cfm).
Introduction: first, we define some basic units to measure general
properties of any energy carrier or source
(like fuel and electricity). Then come a few more specific units
for specific energy sources, like nuclear energy and oil.
The International System of Units
(SI) is used whenever appropriate, e.g. joule == Ws for energy.
Ultimately, the SI units are based on
three core ones - meter (length), kilogram (mass), and second (time).
List of energy units:
Volume vs. mass measures of natural gas:
This file: http://www.idi.ntnu.no~conradi/klima/energy-units.html.
- Volume of a CF == (0.3048m)**3 == 0.02832 m3 == 28.32 liter.
- Volume of a CCF == 100 that of the CF == 2832 liter.
- The average mass (i.e. "weight") of a corresponding CCF energy carrier,
here natural gas, is calculated from its constituents, typically:
75 % methane (w/ specific weight 0.717 kg/m3),
15 % ethane (1.28),
5 % propane/butane etc. (ca. 1.5),
5 % other gases such as CO2, H2O, sulfor etc. (ca. 1.3).
We shall assume an average specific weight of 0.8 kg/m3,
cf. air weighing 1.3 kg/m3.
- The volume of a therm-US or CCF == 2832 liter, and
weighing 2.832 m3 * (0.8 kg/m3) == 2.0xx kg.
- Energy per volume or weight:
Burning an average CCF gives a thermic energy of 29.31 kWh,
i.e. 10.8?? kWh/m3 or 13.5 kWh/kg.
- 25 000 therm/day is an effect unit much used in UK = 30 538 KW.
Last modified: Fri Aug 5 16:07:45 MEST 2011