Examinando por Autor "Siddique, Muhammad Talha"

Mostrando 1 - 2 de 2
  • Miniatura
    Ítem
    Model-based outlier detection in district heating systems
    (Elsevier B.V., 2024) Garay Martínez, Roberto; Siddique, Muhammad Talha; López Garde, Juan Manuel
    Data-driven methods are increasingly popular for building energy performance assessment. For these to be useful, it is required that good quality data is created through the filtering of outliers and imputation of missing information. In the field of energy use in buildings, there is a clear sensitivity of heat load to outdoor climate, which needs to be considered when identifying outliers and developing imputation methods. We propose to use a well-known changepoint model to define the sensitivity of the data to climate, further segmented by time of the week. Then we use the residuals of the model to identify outliers, where those observation with residuals substantially out of the normality expectations are identified as outliers. Then missing data is repaired by means of linear imputation techniques, considering the patterns for same times of the week in the dataset. As a result of the full process, we were able to identify 5% of outliers, which resulted in the improvement of model metrics in the range of 20% mean absolute error (MAE) and slightly better R2 values.
  • Miniatura
    Ítem
    Optical and thermal modeling of a transparent BIPV system for dynamic performance in buildings
    (Elsevier B.V., 2024) Garay Martínez, Roberto; Siddique, Muhammad Talha
    In developed countries, the building sector accounts for up to 40% of the consumed energy. During the past centuries, fossil fuels have been the main energy source to heat, cool, or provide electric power to buildings, but with the increasing energy prices in the beginning of the 21st century, an increasing number of products and systems have been developed for the integration of renewable energy systems in the building sector. One of the most commonly used technologies involves the integration of photo-voltaic (PV) systems in the building fabric. Several technical solutions are available for this integration, although most common ones are related to PV integration in roofs. However, an increasing interest has been shown in semi-transparent PV systems for integration in windows and curtain-wall systems.