Question 1
Avg. insolation
house roofs
one roof area
200 W/m^2
7.00E+07 number of roofs
169 m^2
total roof area
1.18E+10
avg roof insolation2.37E+12
10% eff.*insol.
2.37E+11
primary power
3.30E+12
% total US power 7.17E+00
electricity cons. 4.00E+11
% total elec
5.92E+01
•
•
•
Average Incoming solar radiation (insolation): 200 W/m2
2000 U.S. Primary Power Consumption: = 3.3 TW
1999 U.S. Electricity Consumption = 0.4 TW
•
•
7x107 detached single family homes in U.S.
≈13 m x 13 m roof
m^2
W
W
W
--->
7% of total US power consumption
--->
59% of total US electricity
Question 2
Generally speaking, higher urban density means less rooftop area/person,
so less opportunity to use solar panels on rooftops.
However, demand also declines with smaller home sizes, so there is some trade-off.
Question 3
Increase average efficiency (e.g. thin film cells, single crystalline Si, multi-layer, bulk heterojunction)
Patterned lines that could be deposited on window glass or other building materials besides roofs
Install above roads, parking lots, paved areas in addition to rooftops
Question 4a
outer envelope, tubular:
0.020045 height in m
0.021 width in m
1 length in m
0.000420945 volume in m^3
0.420945 volume in L
5.727908806 cathode circumference, cm
100 cathode length, cm
572.7908806 active area, cm^2
343.6745283 cell power, W
0.816435706 kW/L
Question 4b
outer envelope, planar:
11 cm
width
11 cm
length
0.505 cm
thickness
81 cathode area, cm^2
81 W/cell
61.105 volume of cell envelope, cm^3
0.061105 volume of cell envelope, L
1325.587 W/L
1.325587 kW/L