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Retrofit of multi-family homes with central heat recovery ventilation, learnings from three case studies

: Coydon, F.; Herkel, S.; Henning, H.-M.

Fulltext urn:nbn:de:0011-n-4355415 (1.1 MByte PDF)
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Created on: 7.4.2017

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Heiselberg, Per Kvols ; Aalborg University, Department of Civil Engineering; Federation of European Heating, Ventilating and Air-conditioning Associations -REHVA-:
Clima 2016, 12th REHVA World Congress. Proceedings. Vol.1. Online resource : 22-25 May 2016, Aalborg, Denmark
Aalborg: Aalborg University, 2016
ISBN: 87-91606-26-8
ISBN: 87-91606-36-5
Paper 236, 11 pp.
CLIMA Congress <2016, Aalborg>
Federation of European Heating, Ventilation and Air-Conditioning Associations (REHVA World Congress) <12, 2016, Aalborg>
Conference Paper, Electronic Publication
Fraunhofer ISE ()
Thermische Anlagen und Gebäudetechnik; building retrofit; energy efficiency; heat recovery; ventilation; Gebäudeenergietechnik; Betriebsführung und Gesamtenergiekonzept

This paper addresses the implementation of ventilation systems within the context of energy retrofit of residential buildings. Indoor air quality is a parameter of crucial importance when the airtightness of the building envelope is increased. A mechanical ventilation system is required and may strongly influence the energy demand of the building and the user comfort. Three German multifamily homes have undergone deep energy retrofits and have been equipped with central ventilation systems with heat recovery. An analysis of their implementation and of the results provided by a long-time monitoring is proposed. A definition of the heat recovery efficiency taking the electricity demand and primary energy coefficients into account is proposed and implemented to evaluate the performance of the three analysed ventilation systems. It can be concluded that the implementation of central heat recovery ventilation systems in the energy retrofit of residential buildings provides a high thermal comfort as well as good energy performances despite the differences between these performances and the ones expected during the planning phase and despite the difficulties to operate these systems correctly.