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THE
POWER OF SOLAR ENERGY
Glossary
of Renewable Energy
Terms and Phrases
(Source: U.S. Department
of Energy Solar Now Project)
A
B C D E
F G H I
J K L M
N O P Q R
S T U V W X Y
Z
A
AC
Electrical energy which alternates cyclically
between positive and negative in polarity. In many
countries, including the U.S., the polarity reversal is
made to occur 60 times per second (60 hertz).
Acid Rain
Rain mixed with sulphuric, nitric and other acids which
arise from emissions released during the burning of fossil
fuels.
Ampere (amp)
The measure of the number of electrons flowing past a
given point in an electrical conductor in a given amount of
time; this is the electrical current.
B
Ballast
A charging device in fluorescent lights which give a
"jump start" to the gas inside the tube to
make it start glowing steadily.
Biomass
Living materials (wood, vegetation, etc.) grown or
produced expressly for use as fuel.
Biomass fuels
Wood and forest residues, animal manure and waste,
grains, crops and aquatic plants are some common biomass
fuels.
BTU
British Thermal Unit—A measure of heat energy; the
amount needed to raise the temperature of one pound of water
by one degree Fahrenheit.
C
Calorie
Calorie
Metric thermal unit: a measure of heat energy; the
amount needed to raise the temperature of one kilogram
of water by one degree Centigrade. This is the large
Calorie (used relating to food energy content)
definition. The "small" calorie of fuel
research is the amount of energy needed to raise the
temperature of one gram of water by one degree
Centigrade.
Concentrator
A tool that uses lenses and/or mirrors to focus and
enhance the sun's rays onto the photovoltaic surface.
Conservation
Achieving the use of less energy, either by using more
efficient technologies or by changing wasteful habits.
D
DC
DC
Electrical energy that does not cyclically alternate
in polarity: e.g. electrical energy from a battery or
solar cell.
E
Efficiency
Efficiency
The ration of desired work-type output to the
necessary energy input, in any given energy
transformation device. An efficient LIGHT bulb for
example uses most of the input electrical energy to
produce light, not heat. An efficient HEAT bulb uses
most of its input to produce heat, not light.
Energy
The capacity to do work.
Energy-efficient
Electrical lighting devices which produce the same
amount of light (lumens) using less electrical energy than
incandescent electric light bulbs. Such devices are usually
of the fluorescent type, which produce little heat, and may
have reflectors to concentrate or direct the light output.
Energy sources
Energy sources are: 1. fossil fuels (coal, oil, gas); 2.
nuclear (fission and fusion); 3. renewables (solar, wind,
geothermal, biomass, hydro).
F
Flat Plate
Flat Plate
A photovoltaic surface installed to face south at a
tilt angle equal to the latitude.
Flat-plate tracker
A device mounted under a photovoltaic panel that moves
the panel to follow the path of the sun.
Fluorescent light
A device that uses the glow discharge of an electrified
gas for the illuminating element rather than an electrically
heated glowing conductive filament.
Fossil fuels
Fuels formed eons ago from decayed plants and animals.
Oil, coal and natural gas are such fuels.
Fuel
A material that is consumed, giving up its molecularly
stored energy which is then used for other purposes, e.g.,
to do work (run a machine).
Fuel cell
A device that produces electricity with high efficiency
(little heat) by using a fuel and a chemical which reacts
with it (an oxidizer) at two separate electrical terminals.
An electric current is thereby produced.
Fuel efficiency
The amount of work obtained for the amount of fuel
consumed. In cars, an efficient fuels allows more miles per
gallon of gas than an inefficient fuel.
G
Gaia Hypothesis
The idea that Earth is a living system. Life helps
create the environment it needs in order to live. Gaia
is the ancient Greek word for "Mother Earth."
Geothermal
Pertaining to heat energy extracted from reservoirs in
the earth's interior, as is the use of geysers, molten rock
and steam spouts.
Geothermal energy
Heat generated by natural processes within the earth.
Chief energy resources are hot dry rock, magma (molten
rock), hydrothermal (water/steam from geysers and fissures)
and geopressure (water saturated with methane under
tremendous pressure at great depths).
Global warming
The gradual warming of the earth due to the
"greenhouse effect."
Greenhouse effect
The trapping of the sun's radiant energy, so that it
cannot be reradiated. In cars and buildings the radiant
energy is trapped by glass: in the earth's atmosphere the
radiant energy is trapped by gasses such as
chlorofluorocarbons (CFCs) and carbon dioxide.
H
Hydro
A prefix meaning produced by or derived from water
or the movement of water, as in hydroelectricity.
Hydro power
Power obtained from the natural movement of masses
of water.
Incandescent light
A bulb that uses the ohmic resistance in a conductor
to produce light upon the passage of an electrical
current through it. The conductor is usually in the form
of a wire or filament.
I
Insolation
Insolation
The solar radiant energy impinging on the earth.
Inverter
A device that changes direct current (DC) into
alternating current (AC). Direct current is created by
photovoltaic modules or batteries and converted to AC
through the use of an inverter.
N
Nuclear fission
Nuclear fission
Atomic nuclear processes which involve the splitting
of nuclei with the accompanying release of energy.
Nuclear fuel
Energy derived from atomic nuclear processes during
fission or fusion.
Nuclear fusion
Atomic nuclear processes which involve the fusing of
nuclei with an accompanying release of energy.
O
OTEC
OTEC
Ocean thermal energy conversion technology, which
uses the temperature differential between warm surface
water and cold deep water to run heat engines to produce
electrical power.
Ocean energy
The vast amount of potential energy within the oceans.
P
PV
PV
Photovoltaic; pertaining to the production of
electricity from light.
Photovoltaic cell
(see Solar cell)
R
Renewable energy
Renewable energy
Energy from sources that cannot be used up:
sunshine, water flow, wind and vegetation.
Renewable energy devices
Solar collectors, woodburning stoves, wind machines,
hydroelectric turbines, etc. are typical examples.
S
Solar cell
Solar cell
Device made of semiconductor materials that produces
a voltage when exposed to light.
Solar cooling
The use of devices that absorb sunlight to operate
systems similar to gas-fired refrigerators.
Solar electricity
Electricity produced directly by action of sunlight;
photovoltaics
Solar greenhouse
A conventional greenhouse in which mass is added for
heat storage, double glazing is used, and the north side is
attached to a house or berm.
Solar heating
Processes, active or passive, that derive and control
heat directly from the sun.
Solar process heat
The use of sunlight to drive industrial processes
directly.
Solar thermal energy systems
Systems using concentrating collectors to focus the
sun's radiant energy onto or into receiver to produce heat.
Stand-Alone system
A PV installation not connected to a utility power line.
A 'direct system' uses the PV-produced electricity as it is
produced, e.g., a solar-powered water-pumping station. A
'battery storage system' stores the PV-produced electricity
for use a later time, e.g. at night or on cloudy days.
U
Utility-Intertied system
Utility-Intertied system
A PV installation connected to a utility power line.
W
Weather
Weather
The result of unequal heating of the earth's
atmosphere, as a function of terrain, latitude,
time-of-year and other secondary factors.
Wind machines
Devices powered by the wind that produce mechanical or
electrical power.
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