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  • Periodic Reporting for period 2 - E2VENT (Energy Efficient Ventilated Façades for Optimal Adaptability and Heat Exchange enabling low energy architectural concepts for the refurbishment of existing buildings)

E2VENT Report Summary

Project ID: 637261
Funded under: H2020-EU.

Periodic Reporting for period 2 - E2VENT (Energy Efficient Ventilated Façades for Optimal Adaptability and Heat Exchange enabling low energy architectural concepts for the refurbishment of existing buildings)

Reporting period: 2016-07-01 to 2017-06-30

Summary of the context and overall objectives of the project

The system directly targets a special typology that correspond to suburban multi-storey residential buildings built in the 60’s 70’s that are characterized by a high energy consumption, bad air quality due to the lack of air renewal motorized system, and with low architectural interest.
To tackle all those problems with one refurbishment strategy: we propose an innovative yet simple modular and adaptable system E2VENT. This new system improves the energy efficiency of the European residential buildings stock, reducing the energy consumption and increasing the indoor air quality but also improving the aesthetics of a building, increasing the value of the asset and providing healthier conditions for the occupants.

The E2VENT system is an external thermal building refurbishment solution with external cladding and air cavity that embeds different breakthrough technologies that will ensure its high efficiency:
• A Smart Modular Heat Recovery Unit (SMHRU) for the air renewal allows the heat recovery from the extracted air using a double flux exchanger. Indoor Air Quality is ensured while limiting the energy losses.
• A Latent Heat Thermal Energy Storage (LHTES) based on phase change materials provides a heat storage system for heating and cooling peak saving.
• A smart management that controls the system on a real time basis targeting optimal performances
• An efficient anchoring system that limits thermal bridges and allows an easy and durable installation.

Requirements and specifications of the technical solution will be defined considering European & National legislation and standards, current approaches for building retrofitting, social acceptance and behavioural aspects, and preliminary market assessment. Based on the design, the first prototypes will be manufactured and tested while working on the overall design of the module and especially its integration in the façade in parallel. Once fully developed and tested on the test bench in Anglet, France, the two buildings in Gdansk, Poland and Burgos, Spain will be retrofitted with the E2VENT module.
All along the project the exploitation and dissemination activities will respectively allow to prepare the module for the market and to maximize its impact.

Work performed from the beginning of the project to the end of the period covered by the report and main results achieved so far

Value chain requirements & specifications. The collection of value chain requirements and specifications was carried out during the first 6 months of the project and then discussed within the consortium It presents all the information collected and a synopsis of the main parameters that determine the performances of the E2VENT module. The information was presented with the following categories: hygrothermal performance, energy performance, fire performance, sound performance

Development of elements composing the system: Methodology and design
The E2VENT module embeds two distinct active systems. The SMHRU is the heat recovery unit that allows the air renewal while limiting the thermal losses; the LHTES is based on phase change materials provides a heat storage system that can be used for heating and cooling peak shaving. Those two systems are piloted by a Buildiing Energy Management System. The designs of SMHRU and LHTES as prototypes as they were are at M18 are visible in the following illustrations.
Fig1: Illustration of the SMHRU integration in the wall
Fig2: Illustration of the LHTEs integration in the wall and its functioning modes

Both of the heat exchangers are integrated in a box manufactured by ELVAL COLOR partner of the project. The efficiency of the systems rely on the convective thermal exchange obtained but also on the energy consumption of fans, actuators and the robustness of the system. The prices of each components are evaluated and an equilibrium between overall cost and obtained efficiency is discussed.

Prototypes, measurements and testings on a test bench
The first prototypes of the SMHRU and LHTES have been manufactured by ELVAL COLOR and then shipped to TECNALIA and NOBATEK where all the elements have been assembled and the first tests carried out. Baesed on the first feedbacks and improvements, a new set of prototypes were manufactured, an installation protocole defined, and the prototypes were installed on the test bench in Nobatek's premises. The correct functioning of the two piloted systems was tested. Then acoustic, IR measurements, piloting modes were assessed.
Fig 3: Pictures of the SMHRU i(left); LHTES partially assembled (center) and of the 3 types of PCM encapsulation (right)
Fig 4: Picture of the SMHRU, LHTES and BEMS just installed on the test bench.

The two buildings for the demonstration have been visited, and monitored in order to determine the baseline energy consumption and the internal comfort. Design of the renovation is finished at M30 and the preparation of the renovation is undergoing.
Fig5: Pictures of the building in Burgos (right), the energy meter (center) and of the building in Gdansk. (right)

Exploitation and dissemination
The Key Exploitation Results have been defined and assessed regarding their market potential. An IPR management guide has been defined collaboratively. For public dissemination, the E2VENT website and other communication materials have been prepared. Regarding scientific dissemination, 5 articles in peer reviewed journals have been published, and participation in conferences, fairs, workshops were numerous.

Progress beyond the state of the art and expected potential impact (including the socio-economic impact and the wider societal implications of the project so far)

In the second period, the developments are a follow up to the ones started in the period 1. The two main technical developments of the system went from a concept to a first prototype. For both, requirements and specifications were defined according to the WP1 analysis, then first designs were made and confronted. Based on feedbacks, new designs were produced and the prototypes were manufactured at the end of the 3rd semester of the project. During the 2nd period, another iteration allowed to improve the design especially taking into account easiness of installation, acoustic considerations so that the market and social acceptance are ensured.

The SMHRU is novel as it is a very thin double flux exchanger that can be integrated in a renovation module. The theoretical efficiency that has been calculated is over 90%, although we expect that the measured one will be lower (around 80%) due to practical reasons. This system allows to have a very efficient air renewal that ensures the indoor air quality. It will also be piloted with CO2 and RH sensors that will allow a functioning only when needed increasing its efficiency.
There are different reasons why the LHTES system can be considered as beyond the state of the art. First, with the industrial partner ELVAL manufactured some tubes made in aluminum in order to ensure the PCM encapsulation. This type of encapsulation does not exist in the market and if proved efficient it could be quickly inserted on the market. This encapsulation allows a better heat exchange between the air and the PCM as the surface is high and the conductivity very high, and thus a higher efficiency for the overall system. The patenting of the tubes is now analyzed, and under discussion. Although its performance is not as high as expected, and we are looking to transform it into a heating system that would have a higher efficiency.
For the overall system, the overall performance is now being assessed through the installation on the test bench which is monitored.

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