Thermography and complementary method: a tool for cost-effective measures in retrofitting buildings: Fid-Bau Portal

Thermography and complementary method: a tool for cost-effective measures in retrofitting buildings

Lyberg, Mats D. / Ljungberg, Sven-Ake

Thermographic methods have a good accuracy in indicating damages and energy related conditions of building envelopes. Radiative temperature patterns indicate the extension and character of building anomalies, while radiative temperature differences indicate the severity of the anomaly. However, the usefulness of applying thermography increases substantially if combined with complementary methods. Photographic inspection, using fiber optics, of the interior of the building envelope confirms the indicated occurrence of air leak paths. The influence of air leaks may be quantified by measuring the air change rate using tracer gas techniques. The energy losses for various building components can be calculated using as input building design data and thermographic data. To retrofit or implement energy conservation measures of buildings, the most cost-effective measures must be identified. This requires the collection of relevant technical and economic data. Thermography and complementary methods provides data for making a priority between different possible measures. In this paper, we present the results from a detailed study of one building that was to be retrofitted. Before the retrofit, we analyzed the probable reduction in energy consumption for different measures proposed. Also, the highest investment cost compatible with the investment pay-ff criteria required by the building manager was calculated for each measure. This information was presented in the form of a priority list to the building manager and the contractor. Some measures were selected for implementation. After the retrofit, we have carried out an evaluation of the cost-benefit of the