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Annex 75 Publications
Factsheet: Cost-effective Building Renovation at District Level Combining Energy Efficiency & Renewables
Author(s): Annex 75
Buildings are a major source of greenhouse gas emissions and cost-effectively reducing their energy use and associated emissions is particularly challenging for the existing building stock, mainly because of the existence of many architectural and technical hurdles. The transformation of existing buildings into low-emission and low-energy buildings is particularly challenging in cities, where many buildings continue to rely too much on heat supply by fossil fuels. However, at the same time, there are specific opportunities to develop and take advantage of district-level solutions at urban scale. In this context, the project aims to clarify the cost-effectiveness of various approaches combining both energy efficiency measures and renewable energy measures at the district level. At this level, finding the balance between renewable energy measures and energy efficiency measures for the existing building stock is a complex task and many research questions still need to be answered.
Annex 75 Newsletter - September 2021
Comparative Analysis between Dynamic and Quasi-Steady-State Methods at an Urban Scale on a Social-Housing District in Venice
Author(s): Tiziano Dalla Mora, Lorenzo Teso, Laura Carnieletto, Angelo Zarrella, Piercarlo Romagnoni
The residential building stock represents one of the major players in energy use and greenhouse gas emissions; thus, it is fundamental to reduce the energy used. Simulation tools are becoming more and more accurate in compliance with the new requirements both at the single-building and at the district scale, although they are not affordable by non-specialist users such as policymakers. The research concerns the evaluation of the energy demand for space heating for a historical district that is representative of the Italian building stock. The work compares dynamic and specialist-oriented urban scale tools such as Energy Urban Resistance Capacitance Approach (EUReCA) and City Energy Analyst (CEA)) as well as a quasi-steady-state calculation method (Excel spreadsheet), which is more affordable for non-specialist users. The work was carried out to assess the possible deviation of the results between the dynamic and quasi-steady-state calculation methods, as well as to identify any limits and opportunities in the application of the latter procedure, which is currently the official national calculation tool for the implementation of Directive 2010/31/EU. The study shows how the quasi-steady-state method predicts a reliable building energy demand, in line with the results obtained by the two dynamic tools, when considering only geometry and infiltrations as input. However, the limits of the quasi-steady-state method emerge when introducing internal loads, significantly underestimating the energy demand compared to CEA and EUReCA simulations. The results underline the potential application of the quasi-steady-state method to predict energy demand, although dynamics tools are more reliable but far more complex. Major findings through two methods concern the impact of solar heat gains on the overall heating demand at both the single building and the district scale. The different results between the tools provided evidence of a gap in the use of the simplest tool and demonstrated the accuracy and reliability of the proposed approach with a lower computational effort.
Building renovation at district level – Lessons learned from international case studies
Author(s): Jørgen Rose, Kirsten Engelund Thomsen, Silvia Domingo-Irigoyen, Roman Bolliger, David Venus, Thaleia Konstantinou, Erwin Mlecnik, Manuela Almeida, Ricardo Barbosa, Jon Terés-Zubiaga, Erik Johansson, Henrik Davidsson, Mira Conci, Tiziano Dalla Mora, Simone Ferrari, Federica Zagarella, Ana Sanchez Ostiz, Jorge San Miguel-Bellod, Aurora Monge-Barrio, Juan Maria Hidalgo-Betanzos
Neighbourhood consultancy centres for the adoption of low-carbon technologies by homeowners: experiences from Dutch initiatives
Author(s): Erwin Mlecnik,Oubbol Oung, Ariane Lelieveld, Marianne de Snoo, Coen Vos
Annex 75 Newsletter - December 2020
Success Story in Switzerland - Weggis
The document reports detailed information of a Sucess Story in Switzerland concerning neighbourhood renovation in Weggis
Success Story in Sweden - Hagalund
The document reports detailed information of a Sucess Story in Sweden, concerning neighbourhood renovation in Hagalund
Cost-effective building renovation at district level combining energy efficiency & renewables
Methodology assessment proposed in IEA-Annex 75 and a demonstration case study
Author(s): Jon Terés-Zubiaga, Roman Bolliger, Manuela G. Almeida, Ricardo Barbosa, Jørgen Rose, Kirsten E. Thomsen, Eduardo Montero, Raúl Briones-Llorente
Building renovation plays a key role in reducing greenhouse gas emissions and achieving the climate pro-tection goals. The district scale approach is one of the most effective approaches to accelerate this processof reducing the energy consumption in the building sector as increasing its renovation rates. In this con-text, the Energy in Buildings and Communities Programme of the IEA, IEA-EBC started in 2017 the project‘‘Annex 75: Cost-Effective Building renovation at District Level Combining Energy Efficiency andRenewables” aiming to explore optimal opportunities of district renovations from a cost-benefit perspec-tive. IEA Annex 75 is a co-operative effort of participants from 13 different countries: Austria, Belgium,China, Czech Republic, Denmark, Germany, Italy, The Netherlands, Norway, Portugal, Spain, Swedenand Switzerland. In this paper, key elements of the methodology developed in Annex 75 project are pre-sented. This methodology aims to facilitate the identification of optimal solutions in different Europeancountries, enabling to explore similarities and differences amongst them, with a particular focus on thebalance between energy efficiency measures and renewable energy measures. After a detailed descrip-tion of the developed methodology, it is also applied to a case study located in Portugal and resultsobtained are analysed in detail. The paper demonstrates the usefulness of the methodology for evaluatingand identifying optimal solutions in renovations at district scale, as well as for successfully addressing theresearch questions investigated by the Annex 75 project. They also provide some insights regarding thespecific case study, showing that, although district systems are not usual in the current Portuguese con-text, these centralised solutions in renovations at district level are cost-effective interventions that canlead to significant reductions of greenhouse gas emissions and non-renewable primary energy use.
Success Story in Portugal - Vila D´Este
The document reports detailed information of a Sucess Story in Portugal, concerning neighbourhood renovation in Vila Nova de Gaia.
Success Story in Portugal - Rainha Dona Leonor
The document reports detailed information of a Sucess Story in Portugal, concerning neighbourhood renovation in Porto.
Success Story in Portugal - Boavista
The document reports detailed information of a Sucess Story in Portugal, concerning neighbourhood renovation in Lisboa.
Tecnology Overview Report
Author(s): Ove C. Mørck, Jørgen Rose, Kirsten Engelund Thomsen, Tomas Matuska, Sergio Vega Sanchez
This report is the first of the deliverables from the IEA Annex 75 project. It documents the work of Subtask A – Technology Overview. As the title of the subtask indicates, the idea of this subtask was to create an overview of the available technologies for energy renovation and renewable energy supply at the district level.
The technical and economic characteristics of the technology options are also determined. This includes in particular information on their efficiency, cost elements such as investment costs and operational costs taking into account economies of scale. The interdependencies, obstacles and success factors for combining the technology options are also described.
The technology options are put into context with available potentials, and an outlook is made on their future developments.
Success Story in Spain - Vitoria-Gasteiz
The document reports detailed information of a Success Story in Spain, concerning district renovation in Vitoria-Gasteiz
Success Story in Spain - Tudela
The document reports detailed information of a Sucess Story in Spain, concerning district renovation in Tudela.
Success Story in Italy - Valdastico
The document reports detailed information of a Sucess Story in Italy, concerning district renovation in Valdastico.
Success Story in Italy- Venice Campus
The document reports detailed information of a Sucess Story in Italy, concerning district renovation in the Venice IUAV Campu
Success Story in Italy - Sangallo
The document reports detailed information of a Sucess Story in Italy, concerning district renovation in Sangallo.
Success Story in Italy - Turin
The document reports detailed information of a Sucess Story in Italy, concerning district renovation in Turin.
Success Story in Austria - Strubergrasse
The document reports detailed information of a Sucess Story in Austria, concerning district renovation in Strubergrasse.
Success Story in Italy - Modena
The document reports detailed information of a Sucess Story in Italy, concerning district renovation in Modena.
Success Story in Denmark - Aalborg
The document reports detailed information of a Sucess Story in Denmark, concerning district renovation in Aalborg
Potential of building renovation at district level for reducing CO2 emissions and fostering urban regeneration. IEA-EBC Annex 75
Author(s): Jon Terés-Zubiaga, Manuela G. Almeida , Ove Mørck, Roman Bolliger, David Venus
Publisher: Proceedings of 10th EUROPEAN CONFERENCE ON ENERGY EFFICIENCY AND SUSTAINABILITY IN ARCHITECTURE AND PLANNING, VITORIA-GASTEIZ, 2019
Workshop on upscaling energy renovation to the district level - Summary and Main Findings
Delft, September, 25th, 2019
Author(s): Erwin Mlecnik and Thaleia Konstantinou
Workshop on district renovation towards nZEB - Summary and Main Findings
Bilbao, March 27th, 2019
Author(s): Juan María Hidalgo-Betanzos
Success Story in Sweden - Lund
The document reports detailed information of a Sucess Story in Sweden, concerning district renovation in Lund.
ASHRAE Energy Efficiency for Existing Buildings Standard 100
Deep Energy Retrofit of Buildings Forum 2016 - Washington DC
Author(s): Wayne Stoppelmoor
Annex 75 Newsletter - March 2020
Annex 75 Newsletter - July 2019
Annex 75 Newsletter-November 2018
O potencial das intervenções de renovação a nível urbano para edifícios nZEB
Portuguese national journal article
Author(s): Manuela Almeida and Ricardo Barbosa
Publisher: Edifícios e Energia