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SRML Glossary — "T"
Special thanks to NREL
We'd like to thank the National Renewable Energy Laboratory for
making available to us their glossary, which is the basis of ours. We've
edited and reformatted it, and linked it to our Web pages, and we'll continue
to add our own specialized terms, illustrations, and examples. Please note that
the Solar Radiation Monitoring Laboratory takes full responsibility for any
inaccuracies that may occur.
Links to other glossary sections:
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
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Pertaining to time, such as temporal variation (variation over time).
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Electromagnetic
radiation that is emitted by the Earth, as opposed to solar
radiation emitted by the sun.
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A set of thermocouple junctions connected in series in order to boost the voltage to a meaningful
amount (usually measured in millivolts). A thermocouple is a metallic strip or wire that
produces an electromagnetic potential (voltage) when the two ends (junctions) are at different
temperatures. The "cold" junctions of thermopile radiometers are painted white to reflect radiation,
and the "hot" junctions are painted black to absorb radiation.
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Typical Meteorological Year, a "typical" year of hourly solar
and meteorological values which is designed to produce the expected climate of a location throughout
a year.
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Solar
radiation that is the sum of direct,
diffuse, and ground-reflected
radiation; however, because ground reflected radiation is usually insignificant
compared to direct and diffuse, for all practical purposes global radiation
is said to be the sum of direct and diffuse radiation only.
Shining On (Figure 3) to see solar components.
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Any collector
that changes its orientation throughout the day in order to follow the path
of the sun in the sky. Two-axis trackers continually face the sun,
while one-axis trackers rotate on one axis so that collectors receive
the maximum amount of circumsolar
radiation that strikes the axis.
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The short-term response of an instrument caused by a change of status of the instrument's
environment. For example, the switching of a power supply on and off will send very short-term
power spikes that can be detected by a volt meter with sufficiently rapid response time.
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The fraction
or percent of a particular frequency or wavelength of electromagnetic
radiation that passes through a substance without being absorbed or
reflected.
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The transfer
of water from the leaves of plants to water
vapor in the atmosphere.
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TRNSYS is computer
software that is used for designing buildings and systems that utilize solar energy.
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The lowest region of the atmosphere between the surface of the earth and the stratosphere.
In the troposphere the temperature usually decreases with increasing altitude.
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A colloquial and descriptive name of the parabolic cylinder (surface of constant parabolic
cross-section) used for collecting solar radiation along the focal length.
Trough systems follow the path of the sun by pivoting on one axis (typically East-West or
North-South), using shiny parabolic troughs to heat the collector fluid that passes through
a tube at the focus. Below is an illustration from the
Solar Radiation Data Manual for Flat Plate and Concentrating
Collectors.
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A measure
of the opacity of the atmosphere. A perfectly clear sky has a turbidity
of 0, and a perfectly opaque sky has a turbidity of 1. Turbidity is affected
by air molecules and aerosols.
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Links to other glossary sections:
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
© 2022, UO Solar Radiation Monitoring
Laboratory.
Last
revised: April 6, 2022.
Home page URL: solardata.uoregon.edu |
