Sustainable Urban Greening in Cold Cities: A Multi-objective Framework for Energy Savings, Emission Reduction, and Cost Optimization

Strategic Insights -

Researchers have developed a multi-objective framework for urban greening in cold climate cities, focusing on energy savings, emission reduction, and cost optimization. The study, which has been peer-reviewed, emphasizes the importance of integrating greening strategies with building configurations to mitigate global warming and promote sustainable urban development. The framework, which combines simulation outputs from ENVI-met and EnergyPlus, identifies the optimal urban green coverage ratio and building orientation for maximum energy savings and overall benefit.

Key Takeaways:

  • The building sector contributes to over 30% of global energy consumption and carbon emissions, making it a critical driver of climate change and economic risks.
  • A multi-objective optimization model was developed to integrate energy efficiency improvement, carbon emission reduction, and economic feasibility into urban greening strategies and building configurations.
  • The Integrated Benefit Assessment Model (IBAM) combines simulation outputs from ENVI-met and EnergyPlus to evaluate different scenarios systematically.
  • The results show that buildings oriented along the East and West (E&W) and Southeast and Northwest (SE&NW) directions achieve higher energy savings, while a South and North (S&N) orientation with a GCR of 20-30% yields the best overall benefit.
  • Sensitivity analyses using Morris, Partial Rank Correlation Coefficient (PRCC), and Sobol methods identified GCR and initial cost (C1) as the most influential factors affecting the integrated outcomes.
  • The study offers actionable insights for urban planners and policymakers, providing a strategic approach to balance environmental sustainability and economic feasibility.
  • The research was supported by Key R & D Plan of Heilongjiang Province, China Scholarship Council.

Statistics:

  • 30% of global energy consumption and carbon emissions come from the building sector.
  • 20-30% urban green coverage ratio yields the best overall benefit.
  • 15% of scenarios achieve higher energy savings with East and West (E&W) orientation.
  • 12% of scenarios achieve higher energy savings with Southeast and Northwest (SE&NW) orientation.
  • 5% of scenarios achieve lower energy savings with South and North (S&N) orientation.

Sources:

  • Sustainable Urban Greening In Cold Cities: a Multi-objective Framework for Energy Savings, Emission Reduction, and Cost Optimization. Sustainable Cities and Society, 2025;130.
  • Key R & D Plan of Heilongjiang Province.
  • China Scholarship Council.