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Q
= heat required to raise the temperature of
m
pounds of material by
deltaT
1.
Once you know how many gallons of water you need to heat (
w
), you’ll know
how many pounds of water you need to heat (
w
m
*
345
.
8
=
).
2.
Once you know the current temperature of the water (
T
), you’ll know how much
you need to
increase
the temperature of the water to make it boil
(
T
deltaT
−
=
212
).
a.
Now that you now
m
and
deltaT
, you can calculate
Q
(since you are given
the value of water’s specific heat (
c
) in the problem facts.
3.
In step (2a), you compute how much heat you need to generate. Now you need to
figure out how big the solar panels have to be to produce that much heat. The
problem facts tell you how much solar heat reaches the solar panels: how much
total heat is received by the panels (
R
) depends on how square feet of panels you
have (
A
= panel area)
and
how many hours they are exposed to the sun. Input 3 is
H
= the number of hours of exposure. (
H
A
R
*
*
340
=
)
4.
Efficiency is the percentage of the heat radiation received by the solar panels that
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This note was uploaded on 03/27/2008 for the course ENGR 101 taught by Professor Ringenberg during the Fall '07 term at University of Michigan.
 Fall '07
 Ringenberg

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