Retrofit Europe! Deep renovation tour

On the first day of the conference a deep renovation tour will be organized. During this tour we will visit four locations which represent four different deep-renovation approaches. These four deep-renovation approaches are discussed in more detail below. The main aim of this tour is to provide the conference attendees with project-based insights into different deep-renovation approaches. The key question emerging from these four site visits: how suitable are these approaches to renovate 250 million dwellings across Europe? This question will be addressed during the plenary debate at the end of day 1 of the conference. The second aim of this tour is a meet & greet between researchers and professionals and exchange experiences and/or plan future (research) projects in the field of deep-renovation inspired by the four site visits.
 

Project 1: Zero-ready deep-renovation
General project information

Project Social housing project 't Ven (2017)
Typology 43 single family dwellings
Address Struyckenstraat, Eindhoven
Link https://www.zuid.ballast-nedam.nl/projecten/t-ven/

Short project description

Although several research projects, including MORE-CONNECT, showed that zero-on-the-meter renovation approaches, which significantly improve the energy efficiency of the building envelope with prefabricated panels are based on a sound business case, it still requires a large investment. While most social housing associations lack the financial resources to renovate their housing stock according this standards as stepwise approach is preferred. This includes a “no-regret” approach in which the energy efficiency is significantly improved but not yet toward net-zero., i.e. the balance between energy production and reduction a yearly basis does not yet equals zero. The investments are selected is such a way that they do not hinder future investments towards zero energy (no regret). One of the key measures, and one of the first steps, of this approach is to improve the energy efficiency of the building envelope (by installing highly insulated, prefabricated building envelope modules). This project shows how this solution is applied in the (typical) single family housing market.

On Wednesday an excursion is planned to a state-of-the-art factory which produces this kind of modular façade elements.

 

Project 2: Component based deep-renovation
General project information

Project (1) Eckhart district (2016) and (2) Gerardus square (2018)
Typology Single family housing (private homeowners)
Address Eindhoven
Link http://www.bouwhulp.nl/actueel/de-eerste-proef-alliantie-in-eindhoven-is-geslaagd

Short project description

Component based deep-renovation builds upon the concept of modularity. It attempts to bridge the gap between the advantages of industrialization and customization addressed by a ‘series of one’ approach. This deep-renovation solution is not solely driven by energy efficiency but takes into account the problems of the limited replication potential of project based solutions and the limited level of customization respectively for which modularity offers a conceptual approach. Therefore dwellings are decomposed in seven core components (foundation, façade, roof structure, layout floorplan, extensions, built-in structures (kitchen, bathroom, toilet, staircase, meter cabinet) and energy installation (heat pump, photovoltaics). By decomposing housing into different modules, the existing housing stock could be structured in a different way. In contrast to structuring the building stock into typologies based on layout and year of construction, housing could also be structured based on the modules it is composed of. For example, a roof can be the same module for different types of dwellings at different geographic locations. The challenge will be not to view a dwelling as a 'off' product, but much more as a composition of various components which change over time. Various suppliers offer product solutions linked to one of the core modules of the dwelling. The traditional role of the general contractor has changed from a capacity or craftsman provider to system integrator. This project shows how this deep-renovation approach is applied in the urban district ‘Eckhart’ in the city of Eindhoven.

 

 

Project 3: Zero energy apartment building
General project information

Project De Willem de Zwijger (2018)
Typology Apartment building (social housing)
Address Willem de Zwijgerstraat, Best
Link

http://www.nbarchitecten.nl/de-willem-en-de-zwijger/

https://www.bam.com/nl/pers/persberichten/uniek-in-nederland-nul-op-de-meter-appartementen-in-best3

 

Short project description

To improve the energy efficiency of apartment buildings social housing associations face several alternative approaches. Housing association could consider deep-renovation towards (near) zero energy of new built quality. In this particular project it turned out that new built quality could not be achieved with respect to building acoustics and therefore it was decided to demolish and replace both structures by zero-on-the-meter, 5-storey apartment buildings including in total 48 apartments.

 

Examples of zero-on-the-meter apartment buildings in the Netherlands are scarce in contrast to zero energy single family housing. Photovoltaics integrated in the roof in combination with heat pumps are the key technologies with respect to zero energy housing. However, in contrast to single family housing, photovoltaics on top of apartment buildings is not sufficient to cover the energy consumption of the apartments. For the replacement of the 5-storey apartment buildings photovoltaics have been integrated in the façade on all four sides of the building to compensate for the insufficient energy production, i.e. PV replaces the outer layer (masonry) of the cavity wall. To reduce the construction costs, the façade was designed in such a way that standard CIGS panels could be used. As a result the façade is characterized by a zigzag shape. About 750 m2 CIGS panels are integrated in the façade and another 500m2 CIGS panels are integrated in the balconies. On top of the apartment buildings additional PV panels are installed. The panels are mounted with aluminium frames developed by Energywall (http://www.energywall.nl/). In combination with an installed heat pump in every single apartment, the energy system provides an “energy budget” which covers the energy consumption of each apartment.

 

Project 4: HomeBoss zero energy housing
General project information

Project Single family housing Jan Juffermans
Typology Single family housing (private homeowner)
Address Boxtel
Link

https://www.thuisbaas.nl/jan-marianne/

http://www.janjuffermans.nl/index.html

Short project description

HomeBoss follows a different approach to renovate a dwelling towards zero energy and focus on private homeowners. HomeBoss does not start from a particular technological solution but build upon a business case including the boundary condition to renovate an privately owned single family dwelling towards energy zero for a budget of no more than € 35,000 including VAT. This represents the spending of an average family living in a single family dwelling on energy costs over a period of fifteen years. Therefore the HomeBoss approach builds upon two key principles.

First, HomeBoss aims at improving the energy efficiency of the property so that it no longer consumes fossil fuels. As a result, gas condensed boilers are no longer allowed and include for example (electric) heat pumps or infrared heating system for HVAC, and thermal photovoltaics for domestic hot water.

Second, the renovation budget is limited to a budget of no more than € 35,000. As a result the so-called 'Trias Energetica' is not applied strictly. The insulation of a dwelling is only improved insofar it is required to increase the indoor climate and in particular focus on overcoming thermal bridges found in the building envelope. In contrast to the previous project HomeBoss attempts to avoid replacing the entire building envelope, because it is considered unaffordable. Therefore the deep-renovation approach primarily focus on energy-saving measures such as micro energy efficiency technologies in combination with energy efficient behaviour of the occupants.

 

     

  

 

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