Eraikinen energia-jarrera modelatzeko simulazio dinamikoa. Energia-ziurtagirien balioztapena Trnsys softwarearen bidez

Abstract

The high energy consumption of cities underlines the need to improve energy efficiency in the building sector. In response to this need, European, state or local energy regulations are being promoted, such as the need for energy certification, which qualifies buildings from A to G, and assesses the consumption of non-renewable primary energy and CO2 emissions. On the other hand, the fundamental variables that condition energy performance are often not known and, in these cases, these data must be estimated or incorporated by default. This work aims to overcome this barrier and proposes a simple method to adjust unknown energy variables. As an example research case, a building with energy rating “C” called Gernika-30 is modelled using Trnsys software in order to subsequently optimise its centralised thermal installation. To calculate the heating demand, the balance equation between heat losses and heat gains is applied and easily known variables such as building geometry, orientation and heat transfer coefficients are defined. . The adjustments of the remaining variables, i.e. infiltration and ventilation losses as well as occupancy, lighting and equipment gains, are obtained from the results of six base stages of adjustment, following the BTC guidelines. The results show that internal gains reduce energy consumption by 72%, while ventilation losses increase it by 24%. These tests are taken as a reference to adjust the latest representative model of the building. Consequently, the dynamic simulation capability appears as a fundamental tool to optimise energy consumption and develop energy rehabilitation strategies, promoting the long-term sustainability and efficiency of buildings.