Heat Transfer from Water Bottles Daniel Carlson Daniel Ricks

Introduction Cyclists want their water to stay cold What water bottle will keep ice water cold the longest? Is it worth spending the extra money for a fancy water bottle?

Introduction 5 Bottles Tested –Traditional Bottle –Aquafina Bottle –Thermos –Insulated Bottle –Nalgene Bottle

Heat Transfer Problem Pour equal amounts of ice water in the bottles Measure the temperatures for 2 hours

Assumptions Assume the bottles are cylinders Neglect heat transfer through lids Assume all the bottles are roughly the same size

Heat Transfer Problem Bottles with small k values results in a small rate of heat transfer

Results The thermos performed the best The insulated bottle also performed well Traditional bottles are similar in results k values for bottles

Conclusion Buying an expensive bottle is worth it (if you like cold water) Using a thermos traditionally used for hot beverages is even better than an insulated water bottle A thermos keeps water cold twice as long as a plastic water bottle

Appendix Solving the equation for k gives: