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Article

Modeling Thermal Interactions between Buildings in an Urban Context

1
Building Technology and Urban Systems Division, Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, CA 94720, USA
2
Computational Research Division, Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, CA 94720, USA
*
Author to whom correspondence should be addressed.
This paper is an extended version of Modeling thermal interactions between buildings in an urban context; 2019 IBPSA Building Simulation Conference, Rome, Italy, 2–4 September 2019, (http://buildingsimulation2019.org/).
Energies 2020, 13(9), 2382; https://doi.org/10.3390/en13092382
Received: 20 April 2020 / Revised: 30 April 2020 / Accepted: 7 May 2020 / Published: 9 May 2020
(This article belongs to the Special Issue Selected Papers from BS2019 – Building Simulation)
Thermal interactions through longwave radiation exchange between buildings, especially in a dense urban environment, can strongly influence a building’s energy use and environmental impact. However, these interactions are either neglected or oversimplified in urban building energy modeling. We developed a new feature in EnergyPlus to explicitly consider this term in the surface heat balance calculations and developed an algorithm to batch calculating the surrounding surfaces’ view factors using a ray-tracing technique. We conducted a case study with a district in the Chicago downtown area to evaluate the longwave radiant heat exchange effects between urban buildings. Results show that the impact of the longwave radiant effects on annual energy use ranges from 0.1% to 3.3% increase for cooling and 0.3% to 3.6% decrease for heating, varying among individual buildings. At the district level, the total energy demand increases by 1.39% for cooling and decreases 0.45% for heating. We also observe the longwave radiation can increase the exterior surface temperature by up to 10 °C for certain exterior surfaces. These findings justify a detailed and accurate way to consider the thermal interactions between buildings in an urban context to inform urban planning and design. View Full-Text
Keywords: thermal interaction; longwave radiation; view factor; urban building energy modeling; ray tracing thermal interaction; longwave radiation; view factor; urban building energy modeling; ray tracing
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MDPI and ACS Style

Luo, X.; Hong, T.; Tang, Y.-H. Modeling Thermal Interactions between Buildings in an Urban Context. Energies 2020, 13, 2382. https://doi.org/10.3390/en13092382

AMA Style

Luo X, Hong T, Tang Y-H. Modeling Thermal Interactions between Buildings in an Urban Context. Energies. 2020; 13(9):2382. https://doi.org/10.3390/en13092382

Chicago/Turabian Style

Luo, Xuan; Hong, Tianzhen; Tang, Yu-Hang. 2020. "Modeling Thermal Interactions between Buildings in an Urban Context" Energies 13, no. 9: 2382. https://doi.org/10.3390/en13092382

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