Term
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Definition
| The reverse of cold, something that feels warm. Heat is a form of energy, often defined as energy transfer. |
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Term
| Heat always move from a ________ body to a _______ body. |
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Definition
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Term
| Heat is created _________. |
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Definition
| By the transformation of other types of heat |
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Term
| Give an example on how heat is created. |
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Definition
| Mechanical energy turning a wheel, which causes friction creating heat. |
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Term
| Heat exists at any temperature above _____. |
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Definition
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Term
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Definition
| Fahrenheit, Celsius, Kelvin |
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Term
| Boiling and Freezing Points of the Fahrenheit scale |
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Definition
Boiling = 212 deg F
Freezing = 32 deg F |
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Term
| Boiling and Freezing Points of the Celsius scale |
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Definition
Boiling = 100 deg C
Freezing = 0 deg C |
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Term
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Definition
| The intensity of heat (measured in degrees) |
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Term
| Formula to convert between Fahrenheit and Celsius. |
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Definition
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Term
| Changes that take place when heat is added to H2O. |
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Definition
1. Rise in temperature (Sensible Heat)
2. May melt/vaporize (Latent Heat)
3. May change color or size |
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Term
| Show how H2O changes when heated or cooled. |
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Definition
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Term
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Definition
| Amount of heat necessary to raise 1 # of H20 1 deg F |
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Term
| How does a BTU differ from Heat Intensity? |
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Definition
| Heat intensity is the temperature of the substance and is measured in degrees while the BTU is the amount of heat. |
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Term
| Define Specific Heat of a substance |
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Definition
| Amount of energy per unit of mass required to raise the temperature by 1 deg C |
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Term
| Formula for Quantity of Heat |
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Definition
| BTU = Weight (lbs) x Specific Heat X Temperature Difference |
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Term
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Definition
| Transfer of heat from one place to another |
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Term
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Definition
| transfer of heat from molecule to molecule |
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Term
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Definition
| transfer of heat through a medium |
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Term
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Definition
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Term
| What's Natural Convection? |
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Definition
| Heat transferred through a fluid medium, such as air or water, by currents that result from the rising of less dense, warm fluid and the sinking of heavier, cooler fluid. |
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Term
| What's Forced Convection? |
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Definition
| Heat transferred through a medium such as air or water by currents caused by a device powered by an external energy source. |
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Term
| What are the factors that effect heat transfer? |
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Definition
| Temperature, area of the coil, depth of the coil, and water flow rates |
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Term
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Definition
| Study of heat transfer, how to measure heat transfer, and how temperature affects the operation of everything inside and outside the HVAC/R system |
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Term
| As a substance is heated the molecules _______. |
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Definition
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Term
| Heat exists in all substances down to a temperature of ______. |
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Definition
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Term
| Heat energy can not be ____. |
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Definition
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Term
| The human body gives off heat by ______. |
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Definition
| Convection, Conduction, and Radiation |
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Term
| How many Btu's are required to change 1 # of ice at 20 deg F to steam at 220 deg F? |
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Definition
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Term
| How many Btu's must be removed from 1 # of H20 at 200 deg F for it to end up as ice at 30 deg F? |
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Definition
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Term
| The temperature on the Fahrenheit scale where all molecular biology activity stops is ____. |
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Definition
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Term
| True or False: When water boils at 212 deg F, it's only absorbing latent heat. |
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Definition
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Term
| True or False: Both sensible heat and latent heat transfers can be read by a thermometer. |
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Definition
| False, only sensible heat can be measured. |
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Term
| True or False: Water at 0 deg F has no heat energy or molecular activity. |
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Definition
| False, activity stops at absolute zero |
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Term
| True or False: Temperature difference doesn't affect heat transfer rate. |
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Definition
| False, temperature difference is the main factor |
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