# A New Method of Pixel-level In-situ U-value Measurement for Building Envelopes Based on Infrared Thermography

arXiv: https://arxiv.org/abs/2401.07163 · HTML: https://mlsanity.com/paper/2401.07163/

## Key facts

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- First posted on arXiv 13 Jan 2024.

## Abstract (arXiv)

The potential energy loss of aging buildings traps building owners in a cycle of underfunding operations and overpaying maintenance costs. Energy auditors intending to generate an energy model of a target building for performance assessment may struggle to obtain accurate results as the spatial distribution of temperatures is not considered when calculating the U-value of the building envelope. This paper proposes a pixel-level method based on infrared thermography (IRT) that considers two-dimensional (2D) spatial temperature distributions of the outdoor and indoor surfaces of the target wall to generate a 2D U-value map of the wall. The result supports that the proposed method can better reflect the actual thermal insulation performance of the target wall compared to the current IRT-based methods that use a single-point room temperature as input.