Heat Transfer of a Griddle

1
Heat Transfer of a Griddle

• Phil Kim
• Josh Zimmerman

2
The Project

• Test and Compare the Heat Transfer Rates for two
  Griddles.
• Time to Heat from (98F to 300F)
• Time to Cool from (300F to 98F)
• Verify Power Input (1500 W)

3
Testing Procedure

• Measure Current and Voltage Entering the Griddle.
  (Ammeter/Voltmeter)
• Measure the Temperature in the Center of the
  Griddle. (Thermocouple)
• Measure the Time
• to heat to 300F
• to cool to 98F
• (To avoid burning)
• Measure Volume
• and Surface Area

4
Heating Analysis

• Error in Heating Time
• Black Griddle 1
• Gray Griddle 28

• Error in Temperature
• Black Griddle 2 Hotter than Desired
• Gray Griddle 6.8 Cooler than Desired

5
Cooling Analysis
POWER ANALYSIS Black Griddle uses 1446 W Gray
Griddle uses 1410 W (both out of 1500 W)

• Error in Cooling Time
• Black Griddle 4.2
• Gray Griddle 5.3

6
Observations

• Time to heat is very sensitive to emissivity (?),
  and pan thickness (?).
• Roughly 20 of overall Heating/Cooling was caused
  by Radiation.

7
Conclusions

• Black Griddle is better than the Gray Griddle.
• It heats to the correct temperature
• It heats faster
• It utilizes power better