Weather Definitions

300BN17191 AHTEENIV .K

WEATHER DEFINITIONS ASSIGNMENT 03

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DRY BULB TEMPERATURE:

The dry-bulb temperature (DBT) is the temperature of air measured by a thermometer freely exposed to the air, but shielded from radiation and moisture. The dry-bulb or ‘true air temperature' is a value taken in the shade.

The dewpoint temperature is the temperature at which the air can no longer "hold" all of the water vapor which is mixed with it, and some of the water vapor must condense into liquid water. The dew point is always lower than (or equal to) the air temperature.

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DEW POINT TEMPERATURE:

20 TO 22 °C (UN) 23°C TO 25°C (GRIHA)

12 °C TO 16 °C (LIVE SCIENCE)

RELATIVE HUMIDITY:

Relative humidity is the ratio of the actual amount of moisture present, to the amount of moisture the air could hold at the given temperature & it is expressed in percentage.

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30% TO 60% (MANUAL OF TROPICAL HOUSING)

Wind speed, or wind flow speed, is a fundamental atmospheric quantity caused by air moving from high to low pressure, usually due to changes in temperature.

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WIND SPEED:

3 M/S TO 7 M/S (MANUAL OF TROPICAL HOUSING)

WIND DIRECTION:

Wind direction is the direction from which the wind is blowing. It is not the direction the wind is blowing toward. Wind direction is measured with reference to 360 degrees on the compass (true North), and expressed to the nearest degree, going in a clockwise direction, or to any one of the 16 points on a compass (N, S, SE, WSE, etc...).

HTTPS://ARCOS.DISL.ORG/MAIN/WHATISWINDDIR HTTPS://WWW.NATIONALGEOGRAPHIC.ORG/ENCYCLOPEDIA/WIND/

DIRECT NORMAL RADIATION:

Direct Normal Irradiance (DNI) is the amount of solar radiation received per unit area by a surface that is always held perpendicular (or normal) to the rays that come in a straight line from the direction of the sun at its current position in the sky.

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WWW.3TIER.COM/EN/SUPPORT/SOLAR-PROSPECTING-TOOLS/WHAT-DIRECT-NORMAL-IRRADIANCE-SOLAR-PROSPECTING/ HTTPS://EN.WIKIPEDIA.ORG/WIKI/SOLAR_IRRADIANCE

DIFFUSE HORIZONTAL RADIATION:

It is the amount of radiation received per unit area by a surface that does not arrive on a direct path from the sun, but has been scattered by molecules and particles in the atmosphere. Basically, it is the illumination that comes from clouds and the blue sky.

WWW.3TIER.COM/EN/SUPPORT/SOLAR-ONLINE-TOOLS/WHAT-DIFFUSE-HORIZONTAL-IRRADIANCESOLAR-PROSPECTING WWW.SCIELO.BR

GLOBAL HORIZONTAL RADIATION:

The radiation reaching the earth's surface can be represented in a number of different ways. Global Horizontal Irradiance (GHI) is the total amount of shortwave radiation received from above by a surface horizontal to the ground.

HTTPS://WWW.3TIER.COM/ HTTPS://EN.WIKIPEDIA.ORG/WIKI/SOLAR_IRRADIANCE

HORIZONTAL INFRARED RADIATION:

Also known as atmospheric radiation, it is defined as the total amount of infrared radiative energy reaching a horizontal plane per unit area. The component of infrared radiation emitted from the earth's surface into the sky is referred to as upward infrared radiation.

04 HTTPS://WWW.JMA-NET.GO.JP/KOUSOU/OBS_THIRD_DIV/RAD/RAD_IR-E.HTML

DIRECT NORMAL ILLUMINANCE:

The illuminance provided by a light source on a surface perpendicular to the direction to the source is a measure of the strength of that source as perceived from that location.

HTTPS://EN.WIKIPEDIA.ORG/WIKI/LUX HTTPS://SENSING.KONICAMINOLTA.ASIA/UNDERSTANDING-PHOTOMETRY/

DIFFUSE HORIZONTAL ILLUMINANCE:

EXTERNAL DIFFUSE AND GLOBAL HORIZONTAL ILLUMINANCE VALUES (A) AND INTERNAL DAYLIGHT ILLUMINANCE VALUES (B), BOTH ACQUIRED ON 18TH JUNE AT ROME, ITALY..

Illuminance produced by the visible part of the diffused solar radiation on a horizontal surface on the earth.

WWW.RESEARCHGATE.NET/FIGURE/EXTERNAL-DIFFUSE-AND-GLOBAL-HORIZONTAL-ILLUMINANCE

GLOBAL HORIZONTAL ILLUMINANCE:

"DIFFUSE AND GLOBAL HORIZONTAL ILLUMINANCE TAKEN FROM THE EPW CLIMATE FILE FOR SEVILLE [15]"

illuminance produced by daylight on a horizontal surface on the Earth.

05 HTTPS://WWW.RESEARCHGATE.NET/FIGURE/DIFFUSE-AND-GLOBAL-HORIZONTAL-ILLUMINANCE