Non-Intrusive Measurements to Incorporate the Air Renovations in Dynamic Models Assessing the In-Situ Thermal Performance of Buildings

María José Jiménez, José Alberto Díaz, Antonio Javier Alonso, Sergio Castaño and Manuel Pérez
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María José Jiménez: Energy Efficiency in Buildings R&D Unit, CIEMAT, 28040 Madrid, Spain
José Alberto Díaz: Energy Efficiency in Buildings R&D Unit, CIEMAT, 28040 Madrid, Spain
Antonio Javier Alonso: CIESOL Research Center on Solar Energy, Joint Center University of Almería-CIEMAT, 04120 Almería, Spain
Sergio Castaño: Energy Efficiency in Buildings R&D Unit, CIEMAT, 28040 Madrid, Spain
Manuel Pérez: CIESOL Research Center on Solar Energy, Joint Center University of Almería-CIEMAT, 04120 Almería, Spain

Energies, 2020, vol. 14, issue 1, 1-15

Abstract: This paper reports the analysis of the feasibility to characterise the air leakage and the mechanical ventilation avoiding the intrusiveness of the traditional measurement techniques of the corresponding indicators in buildings. The viability of obtaining the air renovation rate itself from measurements of the concentration of the metabolic CO 2 , and the possibilities to express this rate as function of other climatic variables, are studied. N 2 O tracer gas measurements have been taken as reference. A Test Cell and two full size buildings, with and without mechanical ventilation and with different levels of air leakage, are considered as case studies. One-month test campaigns have been used for the reference N 2 O tracer gas experiments. Longer periods are available for the analysis based on CO 2 concentration. When the mechanical ventilation is not active, the results indicate significant correlation between the air renovation rate and the wind speed. The agreement between the N 2 O reference values and the evolution of the metabolic CO 2 is larger for larger initial values of the CO 2 concentration. When the mechanical ventilation is active, relevant variations have been observed among the N 2 O reference values along the test campaigns, without evidencing any correlation with the considered boundary variables.

Keywords: building energy; building envelope; performance assessment; air renovation; non-intrusive measurements; on-board monitoring (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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