Surface temperatures in New York City: Geospatial data enables the accurate prediction of radiative heat transfer

Ghandehari, Masoud; Emig, Thorsten; Aghamohamadnia, Milad

doi:10.1038/s41598-018-19846-5

Cited by 13 publications

(12 citation statements)

References 30 publications

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“…In Figure 5 we demonstrate the use of time-dependent broadband infrared imaging to study thermographic envelopes of large numbers of buildings in the city skyline. In par-ticular, not only are efficiency characteristics such as heat leaks and thermal couplings detectable [134,135], but the figure also shows that individual HVAC vent duty cycles can be seen at a distance as well. In ongoing and future work we are applying signal processing techniques (e.g., changepoint detection and/or Hidden Markov Models) on these infrared "sources" to extract on and off transitions much like we have done in the broadband visible imaging case [75].…”

Section: Building Thermography At Scalementioning

confidence: 93%

The Urban Observatory: A Multi-Modal Imaging Platform for the Study of Dynamics in Complex Urban Systems

et al. 2021

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We describe an “Urban Observatory” facility designed for the study of complex urban systems via persistent, synoptic, and granular imaging of dynamical processes in cities. An initial deployment of the facility has been demonstrated in New York City and consists of a suite of imaging systems—both broadband and hyperspectral—sensitive to wavelengths from the visible (∼400 nm) to the infrared (∼13 micron) operating at cadences of ∼0.01–30 Hz (characteristically ∼0.1 Hz). Much like an astronomical survey, the facility generates a large imaging catalog from which we have extracted observables (e.g., time-dependent brightnesses, spectra, temperatures, chemical species, etc.), collecting them in a parallel source catalog. We have demonstrated that, in addition to the urban science of cities as systems, these data are applicable to a myriad of domain-specific scientific inquiries related to urban functioning including energy consumption and end use, environmental impacts of cities, and patterns of life and public health. We show that an Urban Observatory facility of this type has the potential to improve both a city’s operations and the quality of life of its inhabitants.

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Section: Building Thermography At Scalementioning

confidence: 93%

The Urban Observatory: A Multi-Modal Imaging Platform for the Study of Dynamics in Complex Urban Systems

et al. 2021

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“…Their result shows that the portion of New York City they observed predominantly uses relatively inefficient high pressure sodium lamps (Dobler et al, 2016). Similar techniques have been deployed to determine New York City's refrigerant use patterns (Ghandehari et al, 2017) and thermal analysis of the built environment (Ghandehari, Emig, & Aghamohamadnia, 2018).…”

Section: The Rise Of City-scale Urban Sustainability Researchmentioning

confidence: 94%

“…City policy-makers can extrapolate this finding to the rest of the city or commission additional research to identify energy efficiency options. Refrigerant use patterns and thermal analysis of the built environment could reveal similar improvement potentials by, for instance, identifying heat losses (Ghandehari et al, 2017;Ghandehari et al, 2018).…”

Section: Urban Sustainability Research Contributions To New York Citymentioning

confidence: 99%

City‐scale urban sustainability: Spatiotemporal mapping of distributed solar power for New York City

Taminiau¹,

Byrne

2020

WIREs Energy & Environment

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Research into urban sustainability increasingly deploys advanced analytics and large-scale data to investigate possible sustainable energy options. This paper reviews several available data-driven approaches that answer urban sustainability questions. One such approach is applied to identify energy consumption and rooftop photovoltaic (PV) generation potential in New York City at the electricity network level with the objective of improving the city's resilience to expected impacts of climate change. Electric system resilience is, in part, dependent on the spatial and temporal distribution of consumption and potential sustainable energy generation which is investigated here by separating the city into 68 electricity networks and evaluating their generationconsumption interaction pattern. The analysis reveals that New York City could be home to about 10 GWp of rooftop solar installations-sufficient to cover approximately 25% of annual city electricity consumption and 53% of daylight hour consumption. Localized electricity import-export dimensions are explored for each of the 68 electricity networks and we identify an excess 3.1 TWh electricity supply per year if the entire technical potential of rooftop solar PV is deployed. This excess electricity supply is roughly equivalent to an annual $734 million value which could benefit low-income areas in the city.

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“…The results demonstrated that a 50 % increase in tree volume induced a 10% decrease in mean radiant temperature (MRT). Ghandehari et al [9] estimated the urban radiant heat transfer based on hyperspectral imaging of building blocks in Manhattan, New York. The study also introduced a geospatial radiosity model to describe the physical processes of LWR heat exchange between buildings.…”

Section: Introductionmentioning

confidence: 99%

Modeling Thermal Interactions between Buildings in an Urban Context

2020

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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.

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Surface temperatures in New York City: Geospatial data enables the accurate prediction of radiative heat transfer

Cited by 13 publications

References 30 publications

The Urban Observatory: A Multi-Modal Imaging Platform for the Study of Dynamics in Complex Urban Systems

The Urban Observatory: A Multi-Modal Imaging Platform for the Study of Dynamics in Complex Urban Systems

City‐scale urban sustainability: Spatiotemporal mapping of distributed solar power for New York City

Modeling Thermal Interactions between Buildings in an Urban Context

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