SHI Research Methods & Evidence-Based Practice 3

Question 1

A solar installer is evaluating a research paper on drain-back system performance. Which section of the paper should be reviewed first to quickly assess overall quality and relevance?

Accepted Answer

Abstract

Answer

The abstract summarizes the study's purpose, methods, findings, and conclusions, enabling rapid assessment of relevance and quality.

Question 2

When using Solar Fraction (SF) as a performance metric, an SF value of 0.70 means:

Accepted Answer

70% of the annual load is met by solar energy

Answer

Solar Fraction represents the proportion of total annual energy demand supplied by the solar system, with 0.70 meaning 70% solar coverage.

Question 3

In a field study comparing evacuated tube vs. flat-plate collectors in a cold climate, which confounding variable must be controlled to ensure valid comparison?

Accepted Answer

Collector tilt angle and azimuth

Answer

Tilt angle and azimuth directly affect irradiance received, so they must be held constant or accounted for when comparing collector types.

Question 4

An evidence-based installer uses the Solar Energy Factor (SEF) from an ENERGY STAR rating to compare water heaters. A higher SEF indicates:

Accepted Answer

Greater combined solar and backup energy efficiency

Answer

SEF accounts for total energy input including backup, so a higher SEF means the combined system delivers more hot water per unit of total energy consumed.

Question 5

A researcher measures collector stagnation temperature under zero-flow conditions. Why is this data important for evidence-based installer practice?

Accepted Answer

It identifies material and fluid degradation risks during power outages or pump failures

Answer

Stagnation temperature defines the maximum thermal stress the system experiences without fluid flow, informing fluid and material selection to prevent degradation.

(SHI) Solar Heating Installer Certification Practice Test

(SHI) Solar Heating Installer Certification Practice Test

SHI Research Methods & Evidence-Based Practice 3