Using Heat Ch 13 Heat Sec 3 Page 435 87 First Law of Thermodynamics Energy that is transferred as a...
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Transcript of Using Heat Ch 13 Heat Sec 3 Page 435 87 First Law of Thermodynamics Energy that is transferred as a...
First Law of Thermodynamics
• Energy that is transferred as a result of work, heat, or both is conserved
This is also known as the
Law of Conservation of Energy87
Second Law of Thermodynamics
• Heat is always transferred from the warmer object to the colder one
87
Heating Systems
• Our body is a heating system– Some of the food we eat is transferred as
heat to blood moving throughout the human body
• We are Endothermic organisms• Normal body temp is 98.6° F• (Or 37 ° C)
88
Solar Heating
• Used by reptiles and other ectotherms
• Ectotherms take on the temperature of their surrounding, use basking
88
Central Heating
• Furnace burns coal, fuel oil or natural gas
• Energy released is transferred to water, steam, or air
• Then, the steam, air or hot water is moved to each room through pipes
89
Active Solar Heating
• Solar heating systems use the same principle
• Solar panels collect sun's rays to heat water,
• The water moves through tubes in the house like the other water heating method
• This may require the use of electricity to move the water through the pipes
89
Passive Solar Heating
• Requires no external source to move the energy
• Depends upon radiation and convection currents in fluids
• Extra Credit possibility :Research a method of passive solar heating and make a presentation to the class
Insulation reduces undesirable energy transfers
• R-value measures the ability to reduce unwanted energy transfers
• See chart on page439– Which is the best
insulator?– Worst?
90
Internal Combustion EngineComponents of a typical,
four stroke cycle piston engine
(E) Exhaust camshaft(I) Intake camshaft(S) Spark plug(V) Valves(P) Piston(R) Connecting rod (C) Crankshaft (W) Water jacket for coolant
flow 91