Справочник Пользователя для PASCO Specialty & Mfg. ENERGY SOLAR TRANSFER ET-8593

®

a) Find the slope of the line tangent to the curve at outside ambient air temperature.  Do not 
use the Slope Tool.  Highlight a small section at outside ambient temperature.  At ambient 
temperature, the heating is only being caused by the sunlight.  Below the ambient 
temperature, the surrounding air is cooling the container.  Above the ambient temperature, the 
surrounding air is heating the container.

  

 = change in temperature/change in time

b) Theory for heat flow

c)Using your slope and the other measured quantities, calculate the intensity of the sun's light.  

The intensity (solar constant) at the top of the Earth's atmosphere is about 1400 Watts/m

2

.  On 

a good clear day with the sun high in the sky, you can get over 1000 Watts/m

2

 on the surface.

a) Compare the intensity at noon to later in the day.

b) Compare a clear day to a slightly overcast day. 

c) Compare summer to winter.

∆T

∆t

--------

=

 where Q =heat, c=specific heat, and 

 = change in temperature

∆T

=

∆T

∆

∆

∆

∆

∆

where 

 is the slope of the graph.

∆

∆

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