Conference Agenda

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Session Overview
Session
TOOLS4
Time:
Tuesday, 05/July/2022:
11:00am - 12:30pm

Session Chair: Thomas Paul LÜTZKENDORF
Location: Hall A


Tools for existing buildings

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Presentations
11:00am - 11:15am

Options of Modelling Refurbishment in LCA: Continuous Improvement Strategy and Next Life Approach

Maria BALOUKTSI, Thomas LÜTZKENDORF

Karlsruhe Institute of Technology (KIT), Centre for Real Estate, Germany

Compared to other goods, buildings have a long lifespan. It is therefore the norm and not the exception that adaptation will be needed at some point in their life cycle to changing environmental conditions, technical progress and new/additional user requirements. The adaptation of existing buildings to future challenges in the form of refurbishment contributes to sustainable development. The proportion of refurbishments is increasing in both absolute and relative terms in the building sector in Europe. It is therefore surprising that the modelling particularities of refurbishment in the context of a life cycle-based environmental performance assessment are still neglected in the EN-standards. The paper deals with these particularities. Specifically, it presents a typology of approaches starting with a distinction between planned refurbishment as B5 and unforeseen refurbishment as an independent design and construction task/ next life cycle, as well as the status of the discussion in selected countries. Recommendations for action for the life cycle assessment are given for specific decision-making situations.



11:15am - 11:30am

European Environmental Databases. OpenDAP, Spanish context.

Sheila OTERO1, Soledad MONTILLA1, Teresa GARNICA2, Belén ABAD3, Marta CONDE2, José Antonio TENORIO1, Guillermo SOTORRIO1

1Eduardo Torroja Institute for Construction Science. CSIC, Spain; 2ETSIAM. Córdoba University. Spain; 3Inditecma, S. L. Spain

With the aim of facilitating the evaluation of sustainability through Life Cycle Analysis, the Eduardo Torroja Institute of Construction Sciences. CSIC) is developing a public database on environmental information: OpenDAP. One of the objectives of this database is to be compatible with other European databases but being totally open, public and free. In this regard, CSIC is a member of the WG InData (Open Data-Network for Sustainable Building), which began its activities in March 2015 and whose main objective is the implementation of a European data network structure using the format of ILCD + EPD data, enhancing and allowing data exchange.

In its beginnings, OpenDAP in the beginning collected Carbon Footprint data in buildings, roads and railways, from different research projects by an agreement with the Spanish Office for Climate Change (OECC). As our work progresses, OpenDAP will offer both generic and specific EPDs from various companies or associations. For this purpose, it was part of the "Sustainable Construction Wood Operational Group" project, coordinated by the University of Córdoba, wich developed environmental information on the main wood products for construction, based on field studies from various manufacturers and obtaining its own national generic data. Generic data will be the main objective of the database, fostering sustainability in construction focused in the early phases of modeling (in the project phase, design phase, etc.).



11:30am - 11:45am

Decision-support Tool for Prioritizing Retrofitting Actions on Social Housing Stock in Italy

Jacopo GASPARI, Ernesto ANTONINI, Lia MARCHI

University of Bologna, Department of Architecture, Italy

According to UNEP and IEA estimations, the residential sector represents one of the main environmental impacts (62%) generator of the entire built environment to which a 40% potential for reduction is, at the same time, approximately associated, playing thus a key role in the world’s path to sustainable development.

Despite the huge efforts spent in the last decades, the social housing stock is still critical within the housing segment, due to the recurrent budget limitations and the serious interrelated implications at environmental, social, and economic levels. In Italy, the social housing stock is held by a small number of agencies constantly facing resource constraints for both maintenance and retrofitting actions which are furtherly limited by a diffuse lack of information regarding the conditions and performance levels of the involved buildings. A research developed in cooperation with a Social Housing Agency of Bologna (Italy) was aimed to develop a speedy tool for comparing the technical and economic effects of alternative or progressive refurbishment scenarios on a case-by-case basis against the investment required. This is not intended as an additional retrofitting tool – among the ones already available – but rather as a way for large housing managers to overcome the intention-action gap that frequently limits the operational capacity due to impossibility of properly prioritizing interventions according to reliable information, survey and diagnostic activities.

The paper focuses on the validation phase of the developed tool, by considering a significant sample of buildings owned by a relevant Italian social housing manager.



11:45am - 12:00pm

Towards An Automatized And Objective Assessment Of Data From Visual Inspections Of Building Envelopes

Jan MANDINEC, Pär JOHANSSON

Chalmers University of Technology, Sweden

The renovation planning process is filled with uncertainties and subjective decisions. These make the decisions upon what and when to renovate a complex and ambiguous problem. Selection of renovation measures related to building envelope are often far from optimal as decisions are usually made based on visual inspections. These are manned and thus prone to subjective assessment and the knowhow of individual inspectors. Furthermore, objective criteria which could indicate non-structural failures are often missing. The objective based planning process allowing the estimation of the current damage status of the building envelope by only using non-destructive measurements is still in its infancy. The first step requires establishing reliable and objective based data collection. These could be efficiently collected by Unmanned Aerial Vehicles (UAV) with subsequent image recognition algorithms allowing the identification of imperfections and store the position and extent of such deviations into the building’s digital assessment database. Such tools do not exist. The aim of this study is to investigate the current objectivization possibilities in the domain of building inspections. The first part provides a literature review describing how an autonomous UAV survey of a building envelope may be planned and what computer vision techniques may be used for automatic damage recognition and classification. Subsequently, an objective detection model based on the YOLO-tiny (You Only Look Once) computer vision framework is employed in a case study investigating a building envelope of historical Tjolöholm castle in Sweden. This study contributes to developing a methodology for an objective based visual inspection process.



12:00pm - 12:15pm

Sustainability Aspects in Real Estate Management – Basics and Opportunities for an Indicator-Based Target and Reporting System in Real Estate Companies

Matthias BUCHHOLZ, Thomas LÜTZKENDORF

Karlsruher Institute of Technology, Germany

Real estate companies face manifold challenges and tasks when it comes to the implementation of sustainability principles. Respective principles refer to sustainability aspects in the design, construction, operation & maintenance and deconstruction phase of single-buildings as well as to the ensuring of future proofness in the whole institutional building stock. Moreover, companies must realign their corporate strategy and rethink their sustainability reporting conventions in order to fulfil legal requirements and to stay competitive. For all the various tasks indicators can help to manifest goals on specific decision levels of Real Estate Management (REM) while they also play a relevant role in sustainability reporting and assessment. The question arises if and to which extent synergies exist in the gathering of information as well as in the development, use and interpretation of indicators for the different tasks in REM. This contribution presents a system of information flows that is able to support a horizontal and vertical integration of information and that takes in count system boundaries and reference units to illustrate the characteristics of specific action and decision levels. Results from a research that reflects the situation in Germany and considers current developments in the EU will be presented.



 
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