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Unformatted text preview: ME112 – Energy
Fall 2010 - UCSB - E. Matthys
Homework Assignment #3 and Progress Report #2
1. (Team work)
a) Find the current retail cost of electricity, gasoline, and natural gas as
close to Santa Barbara as possible. Find also the average retail cost of coal
in the US and the average cost of retail gasoline in another (interesting)
country of your choosing. Be sure to use good sources. Present the results
in a well-organized table. Give all the costs you found in both the standard
units for those fuels as well as converted to kWhr. Include also the
references you used.
b) Identify 5 *interesting* energy-using devices in your households ranging
from small to big (including at least one electric and one natural gas one).
For each one, determine the rated nominal power of the specific devices in
Watts, your estimated use in hours over the year, the estimated energy usage
over the year in kWhr, and the corresponding yearly cost in US$ based on
your current electric and gas costs figures from a) above. (For gas devices
use both the customary units and convert also to W and kWhr.)
Present all the results in a clear table.
Include the full calculations for each device in a separate appendix. Be
specific about your sources of numbers – use full references.
(If you have no gas device in your household, come up with a typical device
from the commercial literature.)
c) Evaluate what fraction of energy used and costs –if any- you could
realistically save by either alternative usage or technology (identify and
describe the alternatives) for each of these devices. Discuss.
d) Discuss and explain the difference in retail cost between natural gas,
coal, and electricity
Hardcopy due November 9 at 2 p.m. in class. 2) (team work): Update your project progress chart. Turn in by November
9 at 2 pm in class. ...
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This note was uploaded on 12/22/2010 for the course ME ME 112 taught by Professor Matthys during the Fall '10 term at UCSB.
- Fall '10