No abstract

The use of vegetation for the energy efficiency of buildings is an increasingly widespread practice; therefore, the possibility of representing these systems correctly with the use of simulation software is essential. VGS performances have been widely studied, but currently, the lack of a unique simulation method to assess the efficiency of different types of VGS and the absence of studies evaluating the performances of all the systems available, proposing simulation models for each of them, leads to an incomplete energy representation. The aim of this study is to achieve a consistent and complete simulation method, comparing the different systems’ performances. The research is made up of five main steps. Firstly, a classification to group these systems into specific categories was proposed; secondly an in-depth analysis of existing literature was worked out to establish the methods used for different types of VGS. The study of plant physiology allowed the definition of an energy balance, which is valid for all vegetated surfaces; then, each category was associated to a mathematical formula and finally integrated into the EnergyPlus software. The results achieved for each model were compared evaluating two important parameters for the termohygrometric conditions control: outside walls face temperatures and operative temperatures.

Certainly, the issue of accessibility has, in addition to a well-known social value, obvious economic repercussions. However, these are not easily measurable, as they can be investigated only on the basis of indicators that are mainly qualitative and indirect. That said, this paper will highlight some aspects that can be considered a first approach, identifying the variables and key players in the economic field. The approach, according to the principles of Universal Design, already identifies economic implications related to the design of spaces, objects, and services. The socio-economic relevance has also been underlined within Sen’s economic theories based on the capability approach and is generally referable to the theme of corporate social responsibility. In recent years, all this has been finding a universalistic synthesis in the enunciation of the Sustainable Development Goals. The analysis is conducted according to an interdisciplinary qualitative approach from two main perspectives: the company and the public administration. The study highlights how accessibility—understood according to a broad meaning that considers material and immaterial factors—assumes significant economic value with different specificities, depending on the reference actor (company/public administration). In particular, it is evident that for the company, the issue of accessibility (both with regard to products and services and organizational profiles) is taking on an increasingly important dimension with reference to marketing and ratings. The present work defines with clear evidence the main areas in which the economic value of accessibility appears, although a more in-depth study is needed to define metrics useful for quantifying the phenomenon. The study can be useful in various public and private sectors that involve policy-makers, designers, managers, and companies that produce goods and services.

Straw is an organic material with hygroscopical properties. The high capacity it has of storing moisture from the surroundings can furthermore influence the performance and lead to the possible degradation of the material thereof. The aim of this study was to assess the conductance C-value of a complex material such as straw. A climatic chamber was used to study a sample, which reproduces a traditional plastered straw bale wall. Tests were conducted under different boundary conditions, setting constant values for temperatures and relative humidity. The revision of the assessment's results allowed the calculation of conductance and conductivity values under different conditions. A numerical model was then designed starting from the laboratory data, which was used to characterize material properties. The match between software simulations and laboratory analyses will be a starting point for further tests. Determining the straw conductance C-value is a difficult task to achieve, due to the complexity and the unique properties of the material. In spite of all this, laboratory tests have shown encouraging results, which reflect the great potential of straw as a building material.