Term
| What is energy used for in homes? |
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Definition
*temperature control
*lighting
*hot water
*appliances
*entertainment |
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Term
| Define energy and its two types |
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Definition
Energy is a measurable quantity of heat, work, or light.
Potential energy is stored energy.
Kinetic energy is transitional energy. |
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Term
| First Law of Thermodynamics |
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Definition
| Energy is neither created nor destroyed, but moves from place to place and changes form. |
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Term
| Second Law of Thermodynamics |
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Definition
| Heat moves from high temperature regions to low temperature regions--never the reverse (without additional energy from an external source.) |
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Term
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Definition
British Thermal Unit
Amount of heat required to raise the temperature of 1 pound of water 1 degree Farenheit.
Approximately the amount of heat released by burning one kitchen match. |
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Term
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Definition
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Term
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Definition
| How much energy a material contains, given by the temperature of a given weight of the material |
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Term
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Definition
| Heat released or absorbed as a substance undergoes phase transition |
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Term
Sensible Heat
(and its limitations) |
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Definition
When one BTU is added to one pound of water, the Farenheight temperature increases by 1 degree.
This sensible relationship is not maintained during phase transition. |
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Term
| How many foot-pounds of work equate to 1 BTU? |
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Definition
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Term
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Definition
| A million BTUs (MMBTU) is approximately equals a gigajoule (billion joules.) |
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Term
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Definition
*Energy divided by time
*the rate work is done or heat is released
*the ability or capacity to work or heat |
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Term
| What conditions are necessary for flow? |
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Definition
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Term
| What direction do fluids flow? |
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Definition
| High pressure to Low pressure |
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Term
Materials may be classified as
Conductors
Resistors
Barriers
Define. |
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Definition
Conductor--allows medium to flow rapidly
Resistor--causes the medium to flow slowly
Barrier--stops flow or slows it down to a negligible rate |
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Term
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Definition
| Energy locked in a stable state that can be used for work or heat |
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Term
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Definition
| heat flow in solids via vibrations of stationary molecules |
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Term
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Definition
Heat transfer via fluid flow;
heat flow in fluids where molecules can move, resulting in currents transmitting heat from warmer to cooler areas |
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Term
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Definition
| heat flow through space without a medium of transport |
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Term
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Definition
Measure of conductance
The rate of heat conduction through a one-square-foot slab of any material 1 inch thick |
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Term
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Definition
The measured K-value of a specific material
1 BTU takes 1 hour to pass through 1 square foot of one-inch thick R-1 material with a one degree F temperature difference between the two surfaces. |
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Term
| Name 2 types of thermal radiation important to the study of residential energy efficiency. |
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Definition
*Solar energy
*Infrared radiation |
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