D3.1​: Validation report of reduced use of net primary energy

Summary​

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One of the main targets of the P2ENDURE research consists in the achievement of a cut in the energy demand of the buildings higher than 60% through the adoption of specific plug and play systems and/or solutions, possibly to be chosen within the basket of options offered by the P2ENDURE Consortium. This document presents the methodology to assess the targeted energy saving and the packages of PnP solutions that can guarantee such objective.

To this end, there is the necessity to define specific instruments to perform the energy analyses and to confirm the attainment of the 60% threshold of the energy savings.

In terms of the methodology that should be used, it is important to underline which are the normative references that should be used in the research and in the calculations: the Description of Action (DoA) states that all the energy analyses shall be performed in a full compliance with European Directive 2010/31/EU and its national secondary derived regulations.

Results as well must be presented in terms of primary energy, that is, scientifically, the more correct approach.

Chapter 1, Introduction, presents the Deliverable, its Topics and the storytelling of its development.

Chapter 2 illustrates the Methodology adopted to perform the analyses and to verify the achievement of the expected targets in terms of savings.

The DoA leaves to the stakeholders that are in charge of the case studies the freedom to choose the preferred tool and/or instrument to make the energy analyses and to test the effect of the retrofit interventions with the only three constraints: i) compliance to the EU 2010/31/EU, ii) results in terms of primary energy ["This tool will validate the 60% threshold in primary energy saving in compliance with European Directive 2010/31/EU"] iii) clear definition of the benefits coming from each single action ["Every single phase of the renovation process will be assessed in terms of the energy balance"].

Nevertheless, a considerable effort had been put to define a common framework for all these activities in order to give a clear overview of the energy analyses and to help in the acknowledgment of the effect of specific retrofit strategy even when applied in different contexts.

Theoretically, the energy analyses could be developed also not considering the support of a BIM (Building Information Model), however since the potential of these instruments and of the correlated patches and tools, BEM (Building Energy Model), a specific input was given to the partners asking them to implement the BIM models prepared in Work Package (WP) 2 and WP4.

In the development of this part of the research, the literature review has not provided evidence of any standardized method in the BIM-BEM implementation. A survey of the available possibilities was hence executed finding two preferred approaches: the freeware approach and not freeware approach.

Both are presented in Chapter 2, Methodology illustrating all the passages that are necessary in this implementation in a flow chart.

A further possibility to keep the standard methodologies of calculations in the performing of the energy analyse, was left to all the partners that were not in the condition of developing such a composite digital suite.

Chapter 3 reports the energy demands of the case studies in the pre-renovation scenarios for all the case studies. Together with the figures of the energy requirements associated to the major end uses (electricity, heating, cooling), collected though energy bills and other input, this chapter provides a short report on the methodology adopted to prepare a clear set of data for each case study. These data helped in the finishing of the BIM models (WP4, D 4.3), matching the output of the energy analyses of the simulations with the energy data collected from the bills and other data sources

Chapter 4, Energy simulations and validation results, is a report of all the renovation strategies adopted in each selected case studies.

Partners that oversee the case studies present the selected interventions, illustrating the expected benefits coming from "every single phase of the renovation process will be assessed in terms of the energy balance, investigating embodied energy as well."

The retrofit interventions are presented in terms of their technical specifications and the operations that should put in force to install them. The last are very important in order to demonstrate that these actions are possibly plug and play and lead to lower impacts in terms of both the primary energy associated to the satisfaction of the building end uses and the embodied energy characterizing their materials and their installation.

An omni comprehensive overview of the activities is given also foreseeing the possible "further improvement of the energy performance of the buildings."

Chapter 5, finally, presents the Handbook of solutions, presenting "recommendations on how to achieve the 60% reduction of net primary energy, compared to the pre-renovation scenario". These advices are given basing on the results of the energy analyses reported in previous chapters.