COMPARE RENOVE: energy retrofit of multifamily buildings, from a catalog of solutions to actual performance of energy retrofit

Pierre Hollmuller Head of Systèmes Energétiques Group

Abstract
This study focuses on energy retrofit of post-war multifamily residential buildings, in view of characterizing and improving of current practices. The first part concerns the energy, economic and environmental assessment of 26 retrofit operations, totalizing 3’000 flats and 285’000 m2 heated area. The space heating demand in real conditions of use is compared to the project value, calculated in standard conditions of use. The performance gap is analyzed by way of numeric simulation. At economic level, the retrofit operations are analyzed in terms of costs with energy added value. As a complement, the second part of the study concern specific energy efficiency solutions, which are analyzed on the basis of cases studies operated in real condition of use. The first solution concerns closing of existing balconies in the form of loggias. The second solution concerns heat recovery on exhaust air for preheating of domestic hot water, by way of a heat pump. We finally elaborate recommendations and guidelines for the pre-design of such systems.

Full report: https://archive-ouverte.unige.ch/unige:101940

Authors: Khoury, Jad; Hollmuller, Pierre; Lachal, Bernard Marie; Schneider, Stefan; Lehmann, Ursula.

Note: This result was developed outside of the Renowave project.