Project

E2VENT: development of a ventilated façade module, embedding a air renewal system (SMHRU) and a energy storage system (LHTES), smartly piloted (BEMs), for the renovation of residential buildings,

Goal: The objective of the H2020 funded project E2VENT is the development of a facade module based on ventilated façade elements for the renovation of residential buildings. It embeds a air renewal system with a double flux heat exchanger (SMHRU) allowing to improve indoor air quality while limiting associated thermal losses. Another system based on PCM (LHTES) allows to store energy to cool the associated flat in summer and preheat it in winter.

Methods: Thermal System Design, experimental testings, thermal modeling

Date: 1 January 2015 - 30 June 2018

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Project log

Antoine Dugué
added a research item
This paper investigates the public and professional attitudes towards an innovative energy efficient façade refurbishment system, in Mediterranean countries, including Greece, Italy and Spain. Two types of multiple choice questionnaires were developed and addressed to two different target groups: building professionals and users. The survey questionnaire was created so as to elicit information on the interviewee's background and explore attitudes and perceptions towards the proposed system. Results signify that both potential users and professionals are generally positive towards the system's energy performance; however, the increased cost of acquisition, maintenance issues and the replacement of natural ventilation by mechanical means consist significant constraints that induce hesitations for the users. Professionals are willing to apply a ventilated façade in a future project but the lack of the corresponding knowledge may be an important obstacle to face.
Antoine Dugué
added an update
Context
Entering its final phase, the E2VENT project demonstration on pilots started with the renovation of the first pilot site in Burgos, Spain. The building is in the University of Burgos, partner of the project. It is composed of two rooms, one of which is a computer room for which there is a variable high rate of occupancy with high internal heat loads which imply a need of air renewal and cooling.
Design
The elements composing the design are:
- The SMHRU (Smart Heat Recovery Unit) allows air renewal to ensure better indoor air quality while limiting thermal losses thanks to the double flux heat exchanger.
- The LHTES is a latent heat storage system based on phase change materials that allows cooling in summer.
- The BEM (Building Energy Management) systems that allow the smart piloting of the HVAC systems were prepared and calibrated by CARTIF in their premises
- The ventilated façade. 257 m² of Etalbond panels, colour Anodised Look C32, fixed on vertical T-profiles on VARIO brackets ; with a specific detail for natural light increase.
The SMHRU, LHTES and ventilated façades were manufactured in Greece in ELVAL before being shipped respectively to TECNALIA in Spain, NOBATEK in France and onsite in Burgos. The SMHRU and LHTES were assembled and tested in laboratories before being shipped to Burgos.
The renovation design corresponds to the installation of 3 SMHRU units and 2 LHTES units for a total ventilated façade to be installed of 150 m².
Renovation
The first step of the renovation consisted in the installation of the HVAC systems on the façade and of the commissioning regarding their correct functioning. This phase started the 30th of October and lasted 3 days. The first day corresponded to the fixation to the wall, the second one to the settings and functioning tests especially regarding piloting, and the third one to commissioning when airflow and noise levels were measured.
Feedback and next steps
Now that the systems are installed, the BEMs allow to visualize their state and to pilot it. Both systems are now working and measured data is being continuously collected. The analysis of such data will allow to assess the in situ performance of the systems.
Some elements of feedback regarding the installation process were also integrated so that it is improved for the next installation in Gdansk, Poland in December.
Conclusion
The renovation went as planned, and allowed to collect more information in order to improve the design regarding the installation process. Now the E2VENT team is very much looking forward the measurements in order to assess the efficiency of the system.
 
Antoine Dugué
added a research item
The building sector is responsible for more than 40% of the EU’s total energy consumption. To reduce the energy consumption in buildings and to achieve the EU’s fossil fuel saving targets for 2020 and beyond 2050, the energy efficient retrofitting strategies are critically important and need to be implemented effectively. This paper presents a dynamic numerical investigation of the energy performance of an innovative façade integrate-able energy efficient ventilation system (E2VENT) that incorporates a smart modular heat recovery unit (SMHRU) and a latent heat thermal energy system (LHTES). A number of component simulation models, including SMHRU, LHTES, Cladding and Building Energy Management System (BEMS), were developed and then integrated using the TRNSYS software which is an advanced building energy performance simulation tool. On this basis, sizing, optimisation and characterisation of the system elements including the HVAC system and insulation layer thickness were carried out. The overall energy efficiency of the E2VENT system and its impact on the energy performance of a post-retrofit building were then investigated. In particular, the heating and cooling energy performance of the E2VENT façade module was numerically studied at five different climatic conditions in Europe. Furthermore, the innovative E2VENT retrofitting was compared with traditional retrofittings in terms of the energy efficiency and primary energy savings. It was found that the innovative E2VENT solution can achieve 16.5–23.5% building primary energy saving and compared to the traditional retrofitting, the E2VENT solution can achieve two times less primary energy consumption. Thanks to this efficiency the development of this solution for buildings retrofit is promising.
Antoine Dugué
added a research item
Within the existing European building stock, a large share of the suburban multi-storey residential building stock was built in the 60’s-70’s, when there were only few or no requirements for energy efficiency. These buildings are characterized by very high energy consumption, low air quality due to poor ventilation, and low architectural value. In this context, the European project E2VENT, that started in January 2015, aims at providing new solution of retrofitting of residential building. The proposal is a modular and adaptable ventilated façade retrofitting system that integrates an energy efficient HVAC system. This paper first presents the concept of the E2VENT module, its architecture and how it is currently designed aiming at the reduction of the energy consumption and the improvement of not only the indoor air quality but also of the aesthetic of the building. Then the presentation focuses on the LHTES system, presenting its working principle, its thermal model and how it is designed in order to allow a daily thermal storage for both cooling and heating to allow the peak shaving. Three different PCM encapsulations are presented and discussed based on their efficiency calculated with a simple model but also on more practical considerations. Finally, the first prototypes are shown and the experimental protocol to be carried out is detailed.
Antoine Dugué
added a project goal
The objective of the H2020 funded project E2VENT is the development of a facade module based on ventilated façade elements for the renovation of residential buildings. It embeds a air renewal system with a double flux heat exchanger (SMHRU) allowing to improve indoor air quality while limiting associated thermal losses. Another system based on PCM (LHTES) allows to store energy to cool the associated flat in summer and preheat it in winter.