Details
| Original language | English |
|---|---|
| Pages (from-to) | 800-817 |
| Number of pages | 18 |
| Journal | Journal of Applied Meteorology and Climatology |
| Volume | 61 |
| Issue number | 7 |
| Early online date | 8 Jul 2022 |
| Publication status | Published - Jul 2022 |
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.
Keywords
- Adaptation, Atmosphere–land interaction, Boundary layer, Heat islands, Large-eddy simulations, Urban meteorology
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Atmospheric Science
Sustainable Development Goals
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In: Journal of Applied Meteorology and Climatology, Vol. 61, No. 7, 07.2022, p. 800-817.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Can Areawide Building Retrofitting Affect the Urban Microclimate? An LES Study for Berlin, Germany
AU - Maronga, Björn
AU - Winkler, Matthias
AU - Li, Dan
N1 - Funding Information: Acknowledgments. Author Li acknowledges support from the U.S. National Science Foundation (Grant ICER-1854706) and the U.S. Army Research Office (Grant W911NF-18-1-0360). Simulations were carried out on the computer clusters of the North-German Supercomputing Alliance (HLRN).
PY - 2022/7
Y1 - 2022/7
N2 - 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.
AB - 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.
KW - Adaptation
KW - Atmosphere–land interaction
KW - Boundary layer
KW - Heat islands
KW - Large-eddy simulations
KW - Urban meteorology
UR - http://www.scopus.com/inward/record.url?scp=85134028555&partnerID=8YFLogxK
U2 - 10.1175/JAMC-D-21-0216.1
DO - 10.1175/JAMC-D-21-0216.1
M3 - Article
AN - SCOPUS:85134028555
VL - 61
SP - 800
EP - 817
JO - Journal of Applied Meteorology and Climatology
JF - Journal of Applied Meteorology and Climatology
SN - 1558-8424
IS - 7
ER -