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Ch 8 on Internal Combustion

In: Science

Submitted By vaceves
Words 568
Pages 3
- Heat normally flows from a hotter object to a colder object
Fog
Occurs naturally when humid air experiences a sudden drop in temperature
Section 8.1 Air Conditioners
Removes some thermal energy but cant make it disappear.
It transfers thermal energy from the cooler room air to the warmer air outside
Moving Heat Around: Thermodynamics
An air conditioner transfers heat against its natural direction of flow.
Heat pump- a device that uses ordered energy to transfer heat from a colder object to a hotter object law of thermal equilibrium (zeroth law of thermodynamics) two objects that are each in thermal equilibrium with a third object also in thermal equilibrium with another.
To eliminate thermal energy, you must convert it to another form or transfer it elsewhere
Law of conservation of energy(first law of thermodynamics)
Two ways to transfer energy
The mechanical means – work
Thermal means – heat
Change in objects thermal energy=heat added to object – work done by object

Disorder and Entropy
Ordered energy and thermal energy aren’t equivalent
You can convert ordered energy into thermal but not the other way around.
Ex: when you burn a log you cant turn the smoke back into a log. The particles would have to move back to exactly how they were.
Disorder of an isolated system never decreases.
Entropy: measure of the total disorder in an object
Generally increases
Law of entropy- the entropy of a thermally isolated system of objects never decreases
Air Conditioners
It converts ordered energy into thermal energy and delivers it as heat to the outdoor air

How an Air Conditioner Cools the Indoor Air
Working fluid: this substance absorbs heat from the indoor air and releases that heat to the outdoor air
Heat exchanger- allows heat to flow from the warm air around it to the cool working fluid inside
Evaporator- allows the working

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