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21 Cards in this Set

  • Front
  • Back
Active Solar Energy Collection
systems 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. It is stationary
mounted and does not need to track the sun. It is also a linearconcentrating collector, offering a greater collection
ratio than a flatplate collector.
Condensing Unit
In solar cooling operations, the
unit where refrigerant is condensed from a gas back into a liquid and gives up its heat.
The condenser is located outside
the refrigeration area and transfers heat out of the area to another environment.
Conduction
The transfer of heat from molecule to molecule, straight
through a material or group of
materials.
Convective Loop
whether inside a wall cavity or in another part of the building structure, occurs when air rises along a warm surface and falls along a cold surface, creating a circular movement of warm and cold air.
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
The pure liquid refrigerant
absorbs the heat from the surrounding atea and turns back into a gas
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. It has the
ability to collect heat from diffuse sunlight, even on cloudy days.
Indirect Gain Approach
A type of passice solar collection that makes use of a storage medium to store heat for later use. The storage medium may be rocks, concrete, or water.
Isolated Gain Approach
the solar
collector is isolated from the structure to be heated.
Linear-Concentrationg Parabolic Collection
must track the sun from east to
west in what is known as the azimuth path.
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. This type of collector tracks the height of the sun in the sky, as well as the azimuth path.
Passive Solar Energy Collection
System that do not make use of any externally powered, moving parts, such as circulation pumps, to move heated water or air.
Phase Change
occurs when a substance changes its state (liquid, solid, or gas) to another state.
Photoelectric Effect
The emission of free electrons
when 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
is often made of concrete or masonry material, but it can also be made of water stored in tubes or barrels.
Zenith Path
the height of the sun in the sky