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Assumption
Assumption
Sites at Kuala Lumpur, Malaysia
Local solar time (LST) is 1000 on 20 Apr
Determine solar altitude and azimuth angles
Determine solar azimuth at sunrise and sunset on 20 Apr
Concept
Concept
Sunpath can be used to determine coordinate of sun (Altitude and Azimuth).
PVsyst ( https://www.pvsyst.com/en/) is one of the tools to determine solar path.
Shanghai, China
Northern Hemisphere
Kuala Lumpur, Malaysia
Near Equator
Sydney, Australia
Southern Hemisphere
Step 2.3.1 Generate Sunpath
Step 2.3.1 Generate Sunpath
Open PVsyst
Click Databases >> Geographical sites >> Search sites then click the sites name
If the site is not in the list, click +New >> Key in sites and click Search >> Accept selected point
Rename sites name if needed
Click Sun paths >> Change to Solar Time >> Change to Rect. coord.
Step 1 Generate Sunpath.mp4Step 2.3.2 Mark local solar time on graph
Step 2.3.2 Mark local solar time on graph
Step 2.3.3 Determine Azimuth
Step 2.3.3 Determine Azimuth
Use opposite hemisphere as reference
If site at South Hemisphere, use North as reference.
Azimuth = x-coordinate of the mark
If Azimuth is negative --> East
If Azimuth is positive --> West
Solar azimuth approximates [Angle on x-coordinate of the mark] ([East/West] of [Reference])
Kuala Lumpur at northern hemisphere, so use South as reference.
Solar azimuth approximates -110° (East of South)
Step 2.3.4 Determine Altitude
Step 2.3.4 Determine Altitude
Altitude = y-coordinate of the mark
Solar altitude approximate [Angle on y-coordinate of the mark] from horizontal.
Solar altitude approximates 59° from horizon.
Step 2.3.5 Determine solar azimuth at sunrise and sunset
Step 2.3.5 Determine solar azimuth at sunrise and sunset
Solar Aziumth at Sunrise = Date Line Interception on x-axis (Negative Angle)
Solar Aziumth at Sunset = Date Line Interception on x-axis (Positive Angle)
Reference
Reference
SEDA GCPV Tutorial Fundamental - 28 Nov 2024
Basic Solar Engineering - Question 10
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