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introduction
Energy use by ventilation losses and fans accounts for almost 10% of total energy use in EU. When using hybrid ventilation systems, the expected energy saving on long term within EU is approximately 64 PJ/year for residential buildings, giving a reduction of 3.6 Mton CO2-eq./year. In order to implement hybrid ventilation more knowledge of the working principals and the techniques of these systems are vital.
Hybrid Ventilation
The most promising ventilation systems are based on demand-controlled hybrid technologies. A Demand Controlled Hybrid Ventilation System is a two-mode system using natural forces as long as possible and electric fans only if necessary. Sensor technologies are used to establish the exact required air flow for indoor air quality and thermal comfort to a minimal energy demand.
Reshyvent research project
Within the Fifth Framework Programme of the European Commission a research project RESHYVENT has been started since january 2002.

The aim of the RESHYVENT project is to research, develop, and construct demand controlled hybrid ventilation concepts for residential buildings. The objectives are:

  • to integrate renewables and hybrid technologies in ventilation concepts
  • to determine the impact on GHG mitigation, energy use, IAQ, thermal comfort, noise, further application of renewables and use of low valued energy for heating and cooling
  • to define the parameters for controlling indoor air quality and thermal comfort
  • to give recommendations and proposals for national and international (CEN) standardisation of (advanced) ventilation systems
  • to develop measurement and control strategies for hybrid ventilation systems for different relevant EU climates (severe, cold, moderate, mild and warm)
  • to give specifications, guidelines and terms of references to develop demand controlled hybrid ventilation system including practical application guide and descriptions, suitable to be implemented in EU industries, easy accessible by ICT networks
  • to develop and construct four complete demand controlled hybrid ventilation systems covering four (severe, cold, moderate and mild/warm) European climates
  • to identify market chances, threats and barriers
Saving resources

The expected energy saving by hybrid ventilation systems on a long term within EU is approximately 64 PJ a year for residential buildings. The estimated CO2 reduction will be 3.6 Mton CO2-eq. a year. The expected payback time is 6 (in a cold climate), 9 (moderate climate) to 20 (warm climate) years. An extra energy saving in Eastern Europe at longer term is expected of 1.5 PJ/y (paybacktime 5 years) with an extra CO2 reduction of 0.1 Mton CO2-eq. a year.
Organisation
The project is a clustering of four industrial consortia with a multi-disciplinary scientific consortium. The industrial consortia are served and supported by scientific Support Units corresponding with the defined tasks in the work packages. In total 23 European partners are involved in the project.

The goal of RESHYVENT is to develop, construct and evaluate four complete hybrid ventilation systems for four different EU climate zones. As a result of this the research project will deliver a generic output to companies and industries in terms of technical specifications and guidelines including market economical and social aspects.

Workpackages
The goal of RESHYVENT is to develop, construct and evaluate four complete hybrid ventilation systems for four different EU climate zones. As a result of this we will deliver a generic output to companies and industries (specially addressed to SME’s) in terms of technical specifications and guidelines including market economical and social aspects.

The key elements of the RESHYVENT project are reflected in the work packages:

  1. State of art review of ventilation techniques in residential buildings, available simulation and calculation models, other related EC and IEA work.
  2. Making of a market survey and SWOT analyses and give description of market chances/prospects, restrictions and boundary conditions for the application of hybrid ventilation and study the social aspects of advanced ventilation systems.
  3. Integration of renewables (as well as active as passive application of renewables) and integration of hybrid ventilation in heating and cooling concepts
  4. Give an overview and analyses of the meaning of current standards and regulations including solutions for equivalent functional requirements, improvement and modifications of regulations with special attention for CEN.
  5. Compile design parameters and constraints, making sensitivity analyses.
  6. Development of a calculation model for designing hybrid ventilation and for predicting the performance
  7. Development of control and ventilation strategies for hybrid ventilation
  8. Specifications and terms of references for the development of components for hybrid ventilation systems
  9. Development, with active participation of four industrial consortia, of four complete hybrid ventilation concepts (as demonstration-ready products) for different European climates (severe, cold, moderate and mild/warm conditions)
  10. Asses the impact of urban environments in EU on hybrid ventilation and its potential solutions 
  11. Continuous dissemination, exploitation and monitoring of project results
Milestones and expected results
  • Four complete tested and evaluated hybrid ventilation systems (prototypes, as physical products) for different applications and different European climates
  • A generic report on specifications, design guidelines and boundary conditions for the development of systems and components, addressed to industries in order to use for further developments of commercial products.
  • Dissemination by a final report – Handbook, national and international conferences, seminars/workshops and a website.

Dissemination to Eastern European candidate EU-memberstates by seminar and implementation plan.

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