Heat Saver Contest: Container Due Jan 23

Heat Saver Contest

 

Purpose:    

Design and build acontainer which will:

1      Make your sampleof water have the smallest possible drop in temperature

2      Make your samplehave the lowest rate of heat loss (in watts)

3      Have the smallestmass

4       Prepareyour lab write up beforehand. Write down your formulas so you can plug in numbers in class.

 

Rules:

1.   Your container may be built of heatinsulating materials – but it must be constructed.  You cannot use a manufactured thermosbottle etc.  Foam materials, cups,cozies, packing materials, etc may all be used.  You can’t use your soup or hot chocolate thermos, etc.

 

2.   Your container must be built outside ofclass, no construction allowed during class.

 

3.   Your container must not be larger than 50cmon any side, including internal and external diagonals.  Your container must pass through a 50cmhoop unabated no matter which way it is oriented.

 

4.   Your container must hold 250 ml of waterwithout overflowing.

 

5.   Your container must provide for quick andsimple insertion and removal of a glass thermometer into the middle of yoursample.  The middle of your samplemust be no more than 25cm from the insertion spot.

 

6.   Your entire container must be at roomtemperature when the water is placed into it.

 

7.   The starting temperature of your sample willbe read and recorded at a specified time. The final temperature will be read 15 minutes later.  During this time, the container mustnot be disturbed in any way.  Itmust not be in contact with nor contain anything which might serve as a sourceof heat energy. 

 

8.   Your container must be supported only by thelab bench.  Any item touching thecontainer will be considered part of the container and added to the mass of thecontainer.

 

9.   Temperature will be measured at the bottomcenter of container.

 

Report

Your report is due15 minutes before the end of class in order to get a score and must include:

1)   Title

2)   Standards

3)   Group number

4)   Member names

5)   Date

6)   Period

7)   All data and calculations (heat loss inwatts)

8)   A briefstatement about how your design minimizes heat lost by each of thefollowing mechanisms: CONDUCTION,CONVECTION, and RADIATION

 

Judging –Equal weight will be assigned to 4 categories and highest points will beawarded for:

1)   Minimum temperature drop of water

2)   Minimum mass of container   

3)   Minimum rate of heat loss in watts

4)   Maximum Neatness, completeness, and accuracyof report