Influence of the Thermal Inertia in the European Simplified Procedures for the Assessment of Buildings’ Energy Performance

Sustainability

Luca Evangelisti²  Gabriele Battista¹  Claudia Guattari²  Carmine Basilicata² 

[1] Department of Engineering, University of Roma TRE, via Vito Volterra 62, Rome 00146, Italy;

关键词: thermal inertia;    TRNSYS;    building energy saving;    surface temperatures;    thermal lag;   

DOI  :  10.3390/su6074514

来源: mdpi

【 摘 要 】

This study aims to highlight the importance of thermal inertia in buildings. Nowadays, it is possible to use energy analysis software to simulate the building energy performance. Considering Italian standards, these analyses are based on the UNI TS 11300 that defines the procedures for the national implementation of the UNI EN ISO 13790. These standards require an energy analysis under steady-state condition, underestimating the thermal inertia of the building. In order to understand the inertial behavior of walls, a cubic Test-Cell was modelled through the dynamic calculation code TRNSYS and three different wall types were tested. Different stratigraphies, characterized by the same thermal transmittance value, composed by massive elements and insulating layers in different order, were simulated. Through TRNSYS, it was possible to define maximum surface temperatures and to calculate thermal lag between maximum values, both external and internal. Moreover, the attenuation between external surface temperatures and internal ones during summer (July) was calculated. Finally, the comparison between Test-Cell’s annual energy demands, performed by using a commercial code based on the Italian standard UNITS 11300 and the dynamic code, TRNSYS, was carried out.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.