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COOKING STOVE FOR KENYA EDSGN 100 TEAM 2. Ethan Cook Meshal Alenezi Faris Al Lawati. Table of Contents/Overview. Recognition of Need Problem Description Goals Kenya background Current Stoves used Stakeholders Needs Brainstorm Solution. Recognition of the Need.

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Presentation Transcript
slide2

GPS:

SP3. Students will evaluate the forms and transformations of energy.

  • Analyze, evaluate, and apply the principle of conservation of energy and measure the components of work-energy theorem by
  • describing total energy in a closed system.
  • relating transformations of potential energy to kinetic energy.
  • Analyze the relationship between temperature, internal energy, and work done in a physical system.

ESSENTIAL QUESTION?

Why does society spend a lot of resources on controlling thermal energy?

temperature and the phases of matter1
Temperature and the Phases of Matter
  • In the Fahrenheit scale, water freezes at 32 degrees and boils at 212 degrees
  • The Celsius scale divides the difference between the freezing and boiling points of water into 100 degrees (instead of 180).
converting temperatures
Converting temperatures
  • A friend in Paris sends you a recipe for a cake.
  • The French recipe says to bake the cake at a temperature of 200°C for 45 minutes.
  • At what temperature should you set your oven, which reads temperature in Fahrenheit?
temperature and the phases of matter2
Temperature and the Phases of Matter
  • Temperature measures the kinetic energy per atom due to random motion.
slide7

SUBLIMATION

EVAPORATION

MELTING

GAS

SOLID

LIQUID

FREEZING

CONDENSATION

DEPOSITION

3 PHASES OF MATTER

phase changes
Phase changes
  • When thermal energy is added or subtracted from a material, either the temperature changes, or the phase changes, but usually not both at the same time.
heat and thermal energy
Key Question:

What is the relationship between heat, temperature, and energy?

Heat and Thermal Energy
heat and thermal energy1
Heat and Thermal Energy
  • Temperature is NOT the same as thermal energy.
  • Thermal energy is energy stored in materials because of differences in temperature.
  • The thermal energy of an object is the total amount of random kinetic energy for all the atoms in the object.
  • Remember, temperature measures the random kinetic energy of each atom.
heat and thermal energy2
Heat and Thermal Energy
  • Imagine heating a cup of coffee to a temperature of 100°C.
  • Next think about heating up 1,000 cups of coffee to 100°C.
  • The final temperature is the same in both cases but the amount of energy needed is very different.
heat and thermal energy3
Heat and Thermal Energy
  • Heat is what we call thermal energy that is moving.
  • The joule (J) is the unit of heat (or thermal energy) used for physics and engineering.
  • The calorie is a unit of heat often used in chemistry.

Heat flows from the hot coffee to the cooler air in the room.

specific heat
Specific Heat
  • The specific heat is the quantity of heat it takes to raise the temperature of one kilogram of material by one degree Celsius.
specific heat1
Specific Heat
  • The temperature of gold rises quickly compared with water because its specific heat is much less than the specific heat of water.
heat equation
Heat Equation

Specific heat (J/kgoC)

Heat energy (J)

E = mcp(T2-T1)

Change in

Temperature

(oC)

Mass (kg)

calculate heat
Calculate Heat
  • One kilogram of water is heated in a microwave oven that delivers 500 watts of heat to the water.
  • One watt is a flow of energy of one joule per second.
  • If the water starts at 10°C, how much time does it take to heat up to 100°C?
first law of thermodynamics
First Law of Thermodynamics
  • Energy loss is equal to energy gain.