UO Solar Radiation Monitoring Laboratory

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SRML Glossary — "D"

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


Dewpoint
 
  The temperature at which the water in the atmosphere will condense as drops on a surface.
Diffuse Horizontal Irradiance
 
  Synonym for diffuse sky radiation.


Diffuse Sky Radiation
 
  The radiation component that strikes a point from the sky, excluding circumsolar radiation. In the absence of atmosphere, there should be almost no diffuse sky radiation. High values are produced by an unclear atmosphere or reflections from clouds.

Click Shining On (Figure 3) to see solar components


Direct Normal Irradiance
 
  Synonym for beam radiation, the amount of solar radiation from the direction of the sun.

Click Shining On (Figure 3) to see solar components


Diurnal
 
  Daily, or the daily cycle. A diurnal plot is usually a representative midnight-to-midnight graph of values measured at a smaller time interval (e.g., hourly or 5-minute values).
DOE
 
  In this context, always refers to the United States Department of Energy, although other departments may have the same acronym.
Dry-bulb Temperature
 
  Air temperature measured with a thermometer, similar to ambient temperature. The term "dry-bulb" distinguishes it from the wet-bulb temperature measured by a psychrometer to determine relative humidity.
   
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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© 2000, UO Solar Radiation Monitoring Laboratory.
Last revised: December 11, 2000.


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