MS, Kent State University, 2025, College of Architecture and Environmental Design
This study has examined how Urban Heat Islands (UHI) affect construction workers' thermal stress during summer in New York City. UHI occurs when urban areas are warmer than their rural surroundings, making construction workers particularly vulnerable. New York City was selected for this study due to its dense urban form, increasing summer temperatures, and documented heat-related fatalities, with an average of 350 premature deaths each summer. Currently, OSHA's Heat Illness Prevention Campaign addresses heat stress but lacks a specific federal standard, leaving a gap in the regulation of how urban conditions and site modifications can mitigate heat stress. The Universal Thermal Climate Index (UTCI) is one tool for understanding the negative impacts of UHI on residents. The UTCI, incorporating wind speed, humidity, air temperature, and solar radiation, allowed for the quantification of heat stress across different areas. Furthermore, the simulation tool ENVI-met was chosen because of its compatibility with UTCI and capacity to appropriately consider microclimatic variables and thermal calculations for humans under various settings. ENVI-met simulation modeling was used to study six New York City neighborhoods—Bedford-Stuyvesant, Harlem, Downtown Brooklyn, Brooklyn, St. Albans, and Manhattan—selected based on variations in urban morphology. ENVI-met was first calibrated using field measurements, and then an analysis was conducted from June 28 to July 2, with hourly UTCI data recorded from 6 am to 6 pm. The results revealed a consistent pattern of thermal stress, with UTCI values peaking in the early afternoon (1 pm to 3 pm), reaching severe heat stress levels of 38°C to 42°C. Variations in UTCI values among sites highlighted the impact of local microclimates, with some areas experiencing greater heat stress. Manhattan (Site 6) and Downtown Brooklyn (Site 3) showed the highest UTCI values because of their high building density and minimal green areas, therefore aggrava (open full item for complete abstract)
Committee: Adil Sharag-Eldin (Advisor); Anthony Mirando (Committee Member); Adam Jajtner (Committee Member)
Subjects: Architecture; Science Education; Technology