BUILDING ENERGY RENOVATION THROUGH TIMBER PREFABRICATED MODULES

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The group of tasks dedicated to the Intelligent Modelling Based methodology for the holistic building renovation process with prefabricated modules focuses on the definition of the requirements, the specifications and the methodology to develop the prefabricated modules and the decision supporting tool. The work is divided into five tasks.

The first task goes through the building stock in Sweden, Germany, France and Spain. It describes living area, building typologies, energy performance, ownership variations, as well as structures. From this information, the suitable buildings for prefabricated wood based refurbishment modules have been selected. In Sweden, it is decided that buildings built between 1955 and 1970 are suitable due to their low insulation levels (if energy retrofitting has not been done previously) and lack of air recovery systems. For Germany, more recent buildings are identified such as those built between 1970 and 2000, especially large housing estates, which constitute about 20 % of the building stock. For Spain, the multi-family blocks built between 1940 and 1980 are considered particularly interesting.

The existing refurbishment practices and processes throughout Europe have been subject to very little innovation the last decades. It is characterized by a lack of inconsistency and a high level of errors in installations (often due to mismatch between drawings and reality). This opens for emerging markets and business opportunities for prefabricated modules with a consistent methodology for data handling and communication. The results are presented in deliverable 2.1 (BERTIM holistic renovation process), which is publically available.

The next task deals with the legislative and regulatory requirements for these types of projects. A list of where the different nations have made national choices, made no choice or left the description of the Eurocodes unchanged are provided. The road towards lowering the energy consumption over Europe has been identified and it is vital that manufacturers and software developers are up to date with recent goals and road maps since these are goals set on a national level. A description about the fire regulations concerning combustible facades in the different countries is also provided and published in the deliverable 2.2 (Legislative and regulatory requirements for the building renovation project).

This task will define the requirements of the prefabricated modules, the connection among the included HVAC systems and the location in the building.

In the third task, an analysis of the selected building typologies in each country will be done. In this task building typologies (apartment block, multi-family houses, single family houses, etc), geometries (flat roof, pitched roof, etc), building structure (timber, brick, concrete), installations (central or individual systems, gas or electric), presence of elevator, cellars, etc, will be defined on detail. This information will be provided for the first version of business plan definition.

The fourth task is devoted to the renovation decision making procedure. It will describe how to assess the existing building in order to avoid duplicate work. A multi-criteria assessment procedure is being developed which will take into account the reduction of primary energy consumption, the economic indicators for the renovation product, the installation and commissioning phase as well as the durability of the materials and the maintenance plan. The task will also define how this information feeds into the RenoBIM supporting tool. The task will deliver a document describing these actions by the end of February 2016.

The last task of this WP is focused in the development of a methodology to implement efficient mass manufacturing processes in the timber industry. The methodology should be applicable to most of the wood companies, and if possible, to most of the building typologies. The concept of customized manufacturing will be put into practice. The final prefab component will be based on a general massive product, adaptable to any kind of situation.

The method’s main objective is to look for improvement and efficiency of several steps on the process, which are, manufacturing process and the assembly on site. The conception and design of the component has to be coordinated with the manufacturing and assembly process.

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