Can Areawide Building Retrofitting Affect the Urban Microclimate? An LES Study for Berlin, Germany

verfasst von

Björn Maronga, Matthias Winkler, Dan Li

Abstract

In this work, we investigate the effect of areawide building retrofitting on summertime, street-level outdoor temperatures in an urban district in Berlin, Germany. We perform two building-resolving, weeklong large-eddy simula-tions: one with nonretrofitted buildings and the other with retrofitted buildings in the entire domain to meet today’s energy efficiency standards. The comparison of the two simulations reveals that the mean outdoor temperatures are higher with retrofitted buildings during daytime conditions. This behavior is caused by the much smaller inertia of the outermost roof/ wall layer in the retrofitting case, which is thermally decoupled from the inner roof/wall layers by an insulation layer. As a result, the outermost layer heats up more rigorously during the daytime, leading to increased sensible heat fluxes into the atmosphere. During the nighttime, the outermost layer’s temperature drops down faster, resulting in cooling of the atmo-sphere. However, as the simulation progresses, the cooling effect becomes smaller and the warming effect becomes larger. After 1 week, we find the mean temperatures to be 4 K higher during the daytime while the cooling effects become negligible.

Organisationseinheit(en)

Institut für Meteorologie und Klimatologie

Externe Organisation(en)

Fraunhofer-Institut für Bauphysik (IBP)
Boston University (BU)

Typ

Artikel

Journal

Journal of Applied Meteorology and Climatology

Band

61

Seiten

800-817

Anzahl der Seiten

18

ISSN

1558-8424

Publikationsdatum

07.2022

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Atmosphärenwissenschaften

Ziele für nachhaltige Entwicklung

SDG 7 – Erschwingliche und saubere Energie

Elektronische Version(en)

https://doi.org/10.1175/JAMC-D-21-0216.1 (Zugang: Offen)