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Effect of temperature settings on energy efficiency of a hair dryer

Effect of temperature settings on energy efficiency of a hair dryer. Angela Taylor Bellwood-Antis High School Grade 11. Problem. I wanted to find out if a hair dryer is more energy efficient on the hot or cold temperature setting. How a Hair Dryer Works.

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Effect of temperature settings on energy efficiency of a hair dryer

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  1. Effect of temperature settings on energy efficiency of a hair dryer Angela Taylor Bellwood-Antis High School Grade 11

  2. Problem • I wanted to find out if a hair dryer is more energy efficient on the hot or cold temperature setting.

  3. How a Hair Dryer Works http://www.petervaldivia.com/technology/electricity/electrical-power.php

  4. Power of Hair Dryers • Wattage=power setting • Hair dryers range from 600 to 2500 watts • Mine is rated at 1875 watts • Higher wattage uses energy faster • Higher fan speed=more watts • Higher heat setting=more watts

  5. Evaporation • Process in which atoms/molecules in liquid state gain enough kinetic energy to become a gas http://www.tonywhiddon.org

  6. Temperature vs. Speed • Cold setting=lower wattage • Less energy=more efficient • Evaporation happens faster at higher temps-less time needed • Higher temperature=more efficient

  7. Hypothesis • I think the hair dryer will be less energy efficient on the cold setting because it will take much longer to evaporate all the water.

  8. General Procedure • Measure energy used to dry 15mL of water in a Petri dish for 15 minutes on both the hot and cold setting as well as high and low fan speed • Weigh dish before and after to find amount evaporated

  9. Procedure: Set up

  10. Procedure: Set up

  11. Experimental Design • Experimental Variables: • Different temperature settings • Experimental Groups: • Hot Temp/High Fan settings, Hot/Low settings, Cold/High settings, Cold/Low settings • Control Group: • Petri dish of water allowed to dry for 15 minutes without the hair dryer

  12. Control Variables • Hair dryer at set length from water • 15mL of water • Same hair dryer • 15 minutes of drying time • Always inside (same location in the room)

  13. Humidity and Evaporation • More humidity=less evaporation • Important because if the room I tested in is too humid, the tests won’t accurately reflect the amount of water that could be evaporated in 15 minutes.

  14. Procedure: Analyze Data • Find the amount of evaporated water

  15. Comparing Data using Ratio

  16. Standardizing Data • Set up a proportion to find out how much energy is needed to completely dry the water • Ex: High/Hot: • 15g * 0.092kWh= 1.38 kWh for 15 g 1 g • You wouldn’t just dry 15 minutes worth of water

  17. Total kWh needed- all trials

  18. Averages Adjusted to Evaporate all 15g of water

  19. Average energy needed to evaporate 15g

  20. Petri dish is not realistic Tried hair. Further Trials

  21. Hair

  22. Hair Trials

  23. Averages Adjusted to Evaporate all water

  24. Conclusion • In a Petri dish, the low/cool settings are the most energy efficient. • On real hair, high/hot was least efficient, but the other three weren’t statistically different • I reject my hypothesis that cold would be the least efficient

  25. Improvements • Hair had a high standard deviation • Hard to standardize/weigh • Shorten distance • Not realistic

  26. Sources • http://atoc.colorado.edu/~englishj/Humidity.htm 1-31-11 • http://tlc.howstuffworks.com/style/hair-dryer.htm 1-2-11 • http://www.petervaldivia.com/technology/electricity/electrical-power.php 2-1-11 • http://www.sciencedaily.com/articles/e/evaporation.htm 12-28-10 • http://www.ehow.com/how-does_4564927_blow-dryer-work.html 1-2-11 • http://www.webchem.net/notes/how_far/kinetics/maxwell_boltzmann.htm 12-28-10

  27. Standard Deviation •  =Sum • Xav=Average • Xi= Trial • N =# of Trials • (Xav-Xi)2 • N-1 

  28. Materials • Hair Dryer • Ring stand • Petri dish • Graduated cylinder • Pitcher • Force meter • Hair sample • Physics books • Kill-a-watt meter

  29. Data • Petri Dish • Hot air • High setting • 1: hair dryer wasn’t steady or lined up; water spilled • 2: hair dryer wasn’t lined up; water spilled • Decided to measure masking tape square to align dryer with dish • 3: With masking tape square; water did not spill; evaporated 1.7g, used .12kwh in 5 minutes

  30. Evaporative Cooling • As evaporation occurs, temp of liquid decreases • As faster-moving molecules escape, remaining molecules have lower kinetic energy • This is why sweat cools the human body • Explains why the water in my experiment was cooler, even after having hot air blown on it for 15 minutes.

  31. Hair Data Analysis

  32. Averages Adjusted to evaporate all water

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