Learning Solar Engineering fundamentals and light measurement 方煒台大生機系教授 Wei Fang, Ph.D., Professor Dept. of Bio-Industrial Mechatronics Engineering National.

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Presentation transcript:

Learning Solar Engineering fundamentals and light measurement 方煒台大生機系教授 Wei Fang, Ph.D., Professor Dept. of Bio-Industrial Mechatronics Engineering National Taiwan University

Various sensitivity curves Spectral irradiation vs. sensitivity curve of Plants PlantHuman Receiving light

Absorption peaks of chlorophylla a and b are at red 600~700 nm and blue 400~500 nm region Receiving light

Insects Sensitivity curves chicken Receiving light

Sensitivity curve of plants Light source

Light sensor PhotometerIllumination, in Lux Quantum SensorPhotosynthesis, in μmol/m 2 /s Pyranometer Solar energy, in W /m 2

Sensitivity curves of sensors

Limitation of Quantum sensor Quantum Sensor can not be used to measure red or blue LEDs

Other solar related sensors Portable device Suitable for 3 different units LI-190: Quantum LI-200: Pyranometer LI-210: Photometric meter

About Sun track

Solar declination

Altitude vs. Azimuth angle

Cylindrical Diagram 9:00am on the 1st of April Southern Lat. 32 deg.

Total=direct + diffuse

Sun track of a day

Top view Northern Lat. 30 deg. 0 Latitute

Northern hemisphere Latitude 51 o Latitude 23.5 o

Full Diagram Southern Lat. 32 deg. Learn about: 1.Date line 2.Hour line 3.Azimuth angle 4.Altitude angle Hour line Date line Altitude angle Azimuth angle

Date Lines Southern Lat. 32 deg.

Hour Lines Southern Lat. 32 deg.

Azimuth Angle Southern Lat. 32 deg.

Altitude Angles Southern Lat. 32 deg.

3 D View

Northern Latitude 51 o 12/21 3/21, 9/21 6/21 n=299

Northern Latitude 51 o n=235

Equation of Time

The Analemma

Keatsley, G., 1996

Sun rise/set hour

About Radiation

E.T. solar radiation on a horizontal plane

Spectral irradiance of Sun

PAR Fraction of ET irradiance

Hourly ratio

More about Solar Engineering Fundamentals Following contents, created by the author, are available from DSpace at UVM. Tutorial for MATLAB based solar engineering fundamentalsTutorial for MATLAB based solar engineering fundamentals MATLAB based software for the teaching of Solar Engineering FundamentalsMATLAB based software for the teaching of Solar Engineering Fundamentals

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