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21 Cards in this Set
- Front
- Back
active solar energy collection
|
Systems
that use circulating pumps and fans to collect and distribute heat. |
|
azimuth path
|
The
sun's movement from east to west. |
|
closed loop solar collection
|
Systems
in which a collection medium is used to collect the heat and transfer it to water or air for end use. |
|
compound parabolic collector
|
A combination of a
flat-plate collector and a parabolic collectol, offering advantages of both types. |
|
condesing unit
|
In solar cooling
operations, the unit where refrigerant is condensed from a gas back into a liquid and gives up its heat. |
|
convective loop
|
The loop created
when convection carries heated air from an isolated gain solar collector up to a structure, and cold air return vents allow cooler air to return to the collector". |
|
direct gain approach
|
The
most common type of passive solar collection. In this type of system, there are no significant architectural provisions made to coilect solar energy, other than facing windows in the proper direction |
|
evaporator
|
A
freezing unit used in solar cooling operations. Pure liquid refrigerant absorbs the heat from the surrounding area and turns back into a gas in the evaporator. |
|
flat-plate collector
|
The most
common type of active solar collector. It is typically stationary, mounted on a rooftop, facing south in the northern hemisphere. |
|
indirect gain approach
|
a type of passive solar collection that makes use of a storage medium to store heat for later use.
|
|
isolated gain approach
|
A type
of passive solar collection in which the solar collector is isoiated from the structure to be heated. |
|
linear-concentrating parabolic collector
|
An active solar
collector that tracks the sun's movement, generating temperatures of hundreds of degrees Fahrenheit on a clear day. |
|
open loop solar collection
|
Systems
in which the heated water or air is directly distributed for use. |
|
parabolic dish collector
|
An active
solar collector that is point focusing. It has a tremendous collection ratio, permitting large point-focusing collectors to produce temperatures of thousands of degrees Fahrenheit. |
|
passive solar energy collection
|
Systems that do
not make use of any externally powered, moving parts, such as circulation pumps, to move heated water or air. |
|
phase change
|
a phase change in a substance state (liquid, solid, or gas)
|
|
photoelectric effect
|
The emission
of free electrons r.t hen photons strike certain metals. |
|
photovoltaic cell
|
A cell that converts
sunlight directly into electricity. This occurs when positively charged photons strike the cell and displace electrons from the valence shell of the material making up the cell. Sometimes referred to as a solar cell. |
|
trombe wall
|
a common application of the indirect gain approach is heated throughout the day.
|
|
zenith path
|
The
height of the sun in the sky. |
|
conduction
|
The
transfer of heat from molecule to molecule, straight through a material or group of materials. |