E2VENT main goal is the development of an Energy Efficient Ventilated Facades for Optimal Adaptability and Heat Exchange enabling low energy architectural concepts for the refurbishment of existing buildings.

The old buildings, which represents the vast majority of the building stock, are predominantly of low energy performance and subsequently in need of refurbishment work. Within the existing European building stock, a large share (approximately 34%) of the suburban multi-storey residential building stock is built in the 60’s 70’s, when there were only few or no requirements for energy eciency. Those buildings are characterized by:

  • high energy losses through the envelope and high energy consumption
  • poor aesthetics, and a need for maintenance
  • low indoor air quality mostly related to humidity that can lead to a deterioration of the end user's health

E2VENT will develop, demonstrate and validate a cost effective, high energy effcient, low CO2 emissions, replicable, low intrusive, systemic approach for retrofitting of residential buildings, able to achieve remarkable energy savings, through the integration of an innovative adaptive ventilated façade system, including:

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The developed technologies will be integrated in the ventilated facade, and a real time intelligent façade management system will control operation of the system based on meteorological prediction methods for forecasting in advance the decentralised electricity production and the energy (electrical and thermal) demand of the building enabling maximum RE usage. It will inter-operate with existing or latest state-of-the-art Building Energy Management System, to achieve optimum energy efficiency by reducing primary energy needs, CO2 emissions and peak loads, assuring at least the same comfort levels required by Member States Building Codes, at an affordable price.

Environmental objectives

green leaf  1 Combining energy efficiency and innovative technologies reduce by a factor 4 the primary energy consumption.
 2 Evaluating different parameters like amount of CO2, air age or indoor air temperature, improve The indoor air quality.
Increasing the thermal resistance value of the rehabilitated envelope, increase the inner air temperature and improve the thermal comfort of the end user.
 4 Life cycle analysis approach for the lowest possible impact of the new system.
 5 Ensure air quality and users’ comfort with minimum energy requirements.


Technical objectives

Develop an adaptable smart modular heat recovery unit (SMHRU) adjustable to work into the ventilated façade cavity, and able to recover heat from ventilation air, preheating the ventilation air in winter and precooling it in summer. 1 red cogs
Study the energy recovery potential of the SMHRU, as well as its use for free-cooling and thermal storage strategies.  2 
Develop a latent thermal heat energy storage system (LTHES) based on phase change materials fitting in the cavity and complementary to the SMHRU. 3
Allow effective photovoltaic technology adaptation for the ventilated façade system, ensuring adaptability of PV modules in the external cladding, analysing sun-tracking technologies and integration of PV inverters in the cavity of the ventilated façade, to improve the modularity of the system. 4
Efficiently control the components of the E2VENT system by a building energy management system using thermal and presence sensors and making it responsive to both the dynamic outdoor solicitations and progressive indoor needs. 5



Architectural objectives

blue house Fabricate the system as a modular ventilated façade system, from the point of view of an industrialized concept, avoiding onsite installation mistakes and loses of performance.
Produce the system with innovation criteria, analysing new products as perforated metal profiles for the substructure, new anchorage designs with thermal brake and new materials as low emissive superficial treatments for cladding components.
 3 Develop the system keeping in mind an easy and affordable access for maintenance jobs of all technologies and components.
In order to adapt to different scenarios or climate zones, develop the system with high adaptability degree.
 5 Design the system from a sustainable point of view allowing an energy efficient production and using materials and components with a high value of life cycle analysis.
 6 Improve the aesthetic of the rehabilitated building, increasing its economic and social value.
Increase the durability of the envelope and raise the life expectancy of the rehabilitated building.

Foreseen impact will be:

01 Energy savings of more than 40%, by the holistic use of the ventilated facade, the heat recovery of ventilation air
pic02 At least a reduction of 40% of CO2 emissions, as a consequence of the achieved primary energy savings
pic03 Reduced thermal and electrical peak loads
pic04 Typical performance target of less than 25 kWh/m2 year (excluding appliances) Use of heat recovery units, natural lighting strategies, and insulation thickness; are variable depending on the characteristics of the building to be retrofitted. Therefore E2VENT retrofitting system can be adaptable to different types of buildings and climates, which makes the system versatile.