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Details

E Tech II: Active_Solar
n/a
16
Architecture
Undergraduate 3
10/29/2011

Additional Architecture Flashcards

 


 

Cards

Term
cloudiness and PV-output rules of thumb
Definition

about 80% output on partly cloudy days

about 50% output on hazy humid days

about 30% output on extremely overcast days

Term
photovoltaics
Definition
direct conversion of light into electricity at the atomic level
Term
photoelectric effect
Definition
causes some materials to absorb photons of light and release electrons
Term
most productive hours of sunlight
Definition
9am to 3pm
Term
pv arrays that tract the sun across the sky can increase the power production of the array by_____
Definition
35-50%
Term
only ________ of solar radiation striking a pv module is converted into electricty
Definition
10-20%
Term
three basic types of pv modules:
Definition

1. crystalline

2. thin film

3. solar ink

Term
traditional solar cells made from silicon, usually flat-plate, generally the most efficient
Definition
crystalline
Term
second-gen. solar cells made from amorphous silicon or non-silicon materials such as cadmium telluride
Definition
thin film
Term
third-gen solar cells made from variety of new materials besides silicon, including solar inks using conventional printing press tech, solar dyes, and conductive plastics
Definition
solar ink
Term
four types of solar collectors
Definition

batch collectors (hot water)

flat plate collector (hot water)

evacuated tube collector (hot water)

transpired collectors + solar furnace (hot air)

Term
batch collectors
Definition
consist of one or more storage tanks placed in insulated boxes with their glazed, heat-absorbing sides facing the sun
Term
flat plate collector
Definition
most common collector type; thin rectangular box with a transparent or translucent cover, usually installed on a building's roof
Term
how a flat plate collector works
Definition
small tubes run through the box carrying either water or an antifreeze solution to a black absorbed plate -- absorber plate absorbs radiation and quickly heats up; heat is transferred to the circulating fluid
Term
evacuated tube collectors
Definition
consist of parallel rows of transparent glass tubes each containing an absorber tube with a selective surface coating; solar radiation enters the tube, strikes the absorber, heats a freeze protected liquid flowing through the absorber
Term
transpired collectors
Definition
south-facing exterior wall covered by a dark sheet metal collector which heats indoor air which is drawn into the building through perforations in the collector
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