Environmental Engineering Reference
In-Depth Information
12.5 Exercises
Q1:
Repeat the analysis given in (12.2) and (12.3) for the case of methanol fuel,
CH
3
OH, in air. Given that the HHV for methanol is 22.7 kJ/g, calculate the
energy release for this exothermic reaction.
A1:
1,452.8 kJ
Q2:
Calculate the vehicle propulsion power that must be supplied by a CWT to a
PRT size vehicle at steady state cruise on a guideway for the case of intra-
city speed of 95 mph and inter-city speed of 150 mph. Use the same Excel
file developed for Q7 in Chapter 7, but with the following modifications:
M
v
¼
600
þ
2(75.5)
¼
751 kg,
C
d
¼
0.22,
A
f
¼
2.3 and all remaining
parameters the same.
A2:
P
(
V
¼
95)
¼
26.14 kW and
P
(
V
¼
150)
¼
97 kW
Q3:
For the CWT secondary voltages calculated in Example 1, make the fol-
lowing calculations based on a CWT power loss of 3% and the PRT
guideway power levels calculated in Q2:
a. Find the secondary current when
f
¼
15 kHz and
f
¼
50 kHz given
P
(
V
)
¼
26 kW.
b. Find the secondary current when
f
¼
15 kHz and
f
¼
50 kHz given
P
(
V
)
¼
97 kW.
A3:
a. 26 kW case:
I
s
(
f
¼
15 kHz)
¼
179.3 A
rms
and
I
s
(
f
¼
50 kHz)
¼
53.8
A
rms
b. 97 kW case:
I
s
(
f
¼
15 kHz)
¼
668.9 A
rms
and
I
s
(
f
¼
50 kHz)
¼
200.7
A
rms
Q4:
Cite some societal benefits of widespread automated highway system (AHS)
for intra-city and inter-city commuting and freight transport.
References
1. National Hydrogen Association.
The Energy Evolution: An Analysis of
Alternative Vehicles and Fuels to 2100
, National Hydrogen Association,
2009. Available from www.hydrogenassociation.org.
2. Fahimi B. 'On the efficiency of the fuel cell vehicle with on-board hydrogen
generation'.
IEEE Power Electronics Society, PELS Newsletter
, 2009, vol. 21,
no. 1, pp. 14-17.
3. Stephan C.H., Sullivan J. 'Environmental and energy implications of plug-in
hybrid-electric vehicles'.
Environmental Science and Technology
, 2006.
4. Anderson J.E. 'A Review of the State of the Art of Personal Rapid Transit.'
Journal of Advanced Transportation
, 2000, vol. 34, pp. 3-29.
5. Anderson J.E. 'How innovation can make transit self-supporting'.
Presented at the Conference of Georgist Organizations, Chicago, IL, 19-23
July 2006.
