SHI Site Assessment & Solar Resource Evaluation 3

Question 1

What minimum percentage of unobstructed solar access during the peak solar window is typically required for a site to be considered viable for solar thermal installation?

Accepted Answer

75%

Answer

A minimum of 75% unobstructed solar access during peak hours (9 AM to 3 PM) is the commonly accepted industry threshold for a viable solar thermal installation site.

Question 2

Which free software tool developed by NREL is widely used for solar thermal system performance modeling and includes shading analysis capabilities?

Accepted Answer

SAM (System Advisor Model)

Answer

SAM (System Advisor Model), developed by NREL, is widely used for solar thermal system performance modeling including integrated shading analysis and annual energy output projections.

Question 3

What does 'azimuth angle' refer to in the context of solar site assessment and collector orientation?

Accepted Answer

The horizontal compass direction of the sun or collector measured from true north

Answer

Azimuth angle refers to the horizontal compass bearing measured from true north, used to describe both the sun's directional position and the orientation of a solar collector.

Question 4

When a site assessment reveals significant unremovable shading during the solar window, what is the most professionally appropriate recommendation?

Accepted Answer

Document the shading impact and advise against installation if losses exceed acceptable thresholds

Answer

When shading losses exceed acceptable thresholds and obstructions cannot be removed, professional practice requires documenting findings and advising the client against installation to protect their investment.

Question 5

Which factor most significantly degrades solar thermal collector performance on an otherwise sunny, clear day?

Accepted Answer

Partial shading from a nearby obstruction

Answer

Even partial shading dramatically reduces collector output by directly blocking the solar radiation the collector requires, while small orientation deviations and temperature variations have comparatively minor effects.

(SHI) Solar Heating Installer Certification Practice Test

(SHI) Solar Heating Installer Certification Practice Test

SHI Site Assessment & Solar Resource Evaluation 3