Comparison among Detailed and Simplified Calculation Methods for Thermal and Energy Assessment of the Building Envelope and the Shadings of a New Wooden nZEB House

Abstract

This paper deals with research carried out by the University of Florence on the thermal and energy performances of a recently built nZEB in Mediterranean Italian area. Heterogeneous component and thermal bridges performances have been analysed and critically evaluated with different calculation methods, and the results in terms of energy consumptions for heating and cooling have been compared. Some solar shading devices have been evaluated to reduce the building energy need for cooling. Main results of the research are presented for the components and thermal bridges properties and for the energy balance of the building implemented with different solar shadings.

Are Design Strategies for High-Performance Buildings Really Effective? Results from One Year of Monitoring of Indoor Microclimate and Envelope Performance of a Newly Built nZEB House in Central Italy

“…The case study building, which is extensively described in [15], is a detached singlestory dwelling located in central Italy (in Arezzo, Tuscany). According to the Italian regulation [26], the city of Arezzo is located in climate zone E (Italy is divided in six climate zones from A to F) and is characterized by 2014 HDD (Heating Degree Days).…”

“…In [15], the thermal performance properties of the envelope were partially analyzed. It was highlighted that all over the building envelope there are very small thermal bridges due to the heterogeneity of the materials.…”

“…It is extremely important not only to design a suitable monitoring of the building in the occupational phase to underline these critical issues but also a careful analysis of the collected data. However, currently, a few examples of nZEBs have been monitored in the Mediterranean climate context [15]. In these regions, the cooling energy demand in summer is comparable to or sometimes higher than the one for winter heating and it can be the most challenging issue due to the high external temperature and solar radiation.…”

Analysis of thermal performance of wood and exposed stone-walled buildings in mountainous areas with building envelop variations

“…A building's ability in anticipating the environmental thermal condition is known as building thermal performance. Building thermal performance is signifi cantly infl uenced by building envelope be it in terms of its shape, materials, ornament or color [1][2][3]. Many studies on building envelope have been conducted and they have also found the building envelope design variations they believe capable of creating thermal comfort and energy saving [4,5].…”

Análisis de la influencia, en la demanda de climatización, de estrategias pasivas en viviendas con grandes superficies acristaladas, mediante un código de simulación. La casa Farnsworth = Analysis of the influence, in climate control demand, of passive strategies in houses with large glazed surfaces, by means of a simulation code. The Farnsworth house

“…La primera vivienda unifamiliar diseñada en España con certificación Passivhaus Plus, dispone tan solo en planta baja de un 80% de superficie acristalada (Daniel, Diedrich y Talia, 2017). Cada vez es más habitual y necesario el uso de grandes acristalamientos, (Larrumbide & Bedoya, 2015) incrementándose considerablemente la relación hueco-macizo y siendo esto un punto crítico para el correcto diseño de la climatización (Carletti, Pierangioli, Sciurpi, & Salvietti, 2018).…”