3.4A
Creating Steady-State Heat Flow Conditions
Name:
Observations and Data Collection
1. Complete the following Data Table
Data Table 1
Power Supply Voltage: VS =
Power Supply Current: IS
Thermocouple Reading
Top of Cylinder
Time
(min)
T
Change
T
BOTTOM
(ºC)
V
A
Thermocouple Reading
Bottom of Cylinder
BOTTOM
T
TOP
(ºC)
Temperature
Difference
Change TTOP
4
8
12
16
20
24
28
32
36
2. Complete the following Data Table
Data Table 2
Top
Temperature
T
TOP
(ºC)
Bottom
Temperature
T
BOTTOM
(ºC)
Temperature
Difference
∆T (BOTTOM – TOP)
(ºC)
Input
Heat-Flow Rate
Q
(W)
Input
Heat-Flow Rate
Q
(cal/sec)
Section 3.4A
Questions and Interpretations
1. When the temperature reaches the steady-state condition, what is the relationship
between the heat flow into the cylinder and the heat flow out of the cylinder?
2. Does the heat conduction through the walls of the thermal container affect the
results of your experiment? How?
3. In your home, the thermostat cycles the furnace on and off to keep the temperature
at a preset value. How does the heat-flow rate from the furnace to your home relate
to the heat-flow rate from your home to the outside of the building?