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Assessing thermal performance: Dataset from an experimental study on U-value variability.

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  • 1School of Mechanical Engineering, Technological University Dublin, Ireland.

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This summary is machine-generated.

Accurate building energy audits require U-value measurements. This study measured U-values of windows and walls in a Dublin building, finding significant variations in thermal performance between similar components.

Keywords:
Building efficiencyEnergy auditInsulationThermal performanceU-value

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Area of Science:

  • Building Science
  • Thermal Performance Evaluation
  • Energy Efficiency

Background:

  • Energy savings in existing buildings necessitate thorough energy audits and performance assessments.
  • Accurate estimation of a building's U-value is a critical component of these evaluations.
  • In situ measurement using heat flow meters offers a direct method for determining U-values.

Purpose of the Study:

  • To evaluate the insulation and thermal performance of building fabric elements.
  • To measure the U-value of various windows and walls in a specific building.
  • To identify variations in thermal performance within similar building components.

Main Methods:

  • Conducted an experimental campaign on "Block F" building in Dublin, Ireland.
  • Utilized heat flow meters for in situ U-value measurements.
  • Collected data on windows and walls across different locations and floors.

Main Results:

  • Average heat loss coefficient for windows was ~1.74 W/(m²K) before cleaning and ~1.99 W/(m²K) after cleaning.
  • Average heat loss coefficient for walls was ~0.90 W/(m²K) before cleaning and ~1.07 W/(m²K) after cleaning.
  • Significant differences in U-values were observed for similar types of windows and wall components.

Conclusions:

  • The study highlights the variability in thermal performance even within ostensibly identical building elements.
  • Accurate U-value assessment is crucial for effective energy audits and retrofitting strategies.
  • In situ measurements provide valuable data for understanding real-world building thermal performance.