RT Journal Article T1 Estimation of the heat loss coefficient of two occupied residential buildings through an average method A1 Uriarte, Irati A1 Erkoreka, Aitor A1 Eguía Oller, Pablo A1 Granada Álvarez, Enrique A1 Martin Escudero, Koldo K1 1203.26 Simulación K1 3305.90 Transmisión de Calor en la Edificación K1 3322.04 Transmisión de Energía AB The existing performance gap between the design and the real energy consumption of a building could have three main origins: the occupants’ behaviour, the performance of the energy systems and the performance of the building envelope. Through the estimation of the in-use Heat Loss Coefficient (HLC), it is possible to characterise the building’s envelope energy performance under occupied conditions. In this research, the estimation of the HLC of two individual residential buildings located in Gainsborough and Loughborough (UK) was carried out using an average method. This average method was developed and successfully tested in previous research for an occupied four-story office building with very different characteristics to individual residential buildings. Furthermore, one of the analysed residential buildings is a new, well-insulated building, while the other represents the old, poorly insulated semidetached residential building typology. Thus, the monitored data provided were filtered in order to apply the abovementioned average method. Even without fulfilling all the average method requirements for these two residential buildings, the method provides reliable HLC values for both residential buildings. For the house in Gainsborough, the best estimated HLC value was 60.2 W/K, while the best approach for Loughborough was 366.6 W/K. Thus, despite the uncertainty sources found during the analysis, the method seems promising for its application to residential buildings. PB Energies SN 19961073 YR 2020 FD 2020-11-02 LK http://hdl.handle.net/11093/2264 UL http://hdl.handle.net/11093/2264 LA eng NO Energies, 13(21): 5724 (2020) NO Ministerio de Ciencia, Innovación y Universidades (España) | Ref. RTI2018-096296-B-C22 y -C21 (MCIU / AEI / FEDER, UE) DS Investigo RD 23-sep-2023