Modeling energy demand and emission in urban heat island-affected local climate zones

Unmasking Bandung’s Urban Heat Trap: My Final Year Project on How City Form Fuels Energy Demand and Emissions

As a recent graduate of Urban and Regional Planning at Institut Teknologi Bandung (ITB), I’m thrilled to share the culmination of my undergraduate journey: a deep dive into one of the most critical challenges facing tropical, rapidly expanding cities like Bandung. My final year project tackles the vicious cycle of urban heat and energy consumption, revealing how the very fabric of our cities is driving up energy bills and carbon footprints.

My thesis, titled “Modeling Energy Demand and Emissions in Urban Heat Island-Affected Local Climate Zones in Bandung City,” directly explores the undeniable link between a city’s physical form, the Urban Heat Island (UHI) phenomenon, and its subsequent energy demands.

Bandung’s Silent Energy Drain: The Hidden Costs of Rapid Urbanization

Bandung’s rapid urbanization, while bringing growth, has inadvertently created distinct “heat islands.” These are areas, particularly dense commercial and residential zones, where temperatures are significantly higher than surrounding rural areas. My study utilized a powerful combination of geospatial analysis (Local Climate Zone – LCZ mapping) and Urban Building Energy Modeling (UBEM) to quantitatively simulate and uncover this impact.

The findings were stark, pinpointing three key contributors to Bandung’s escalating energy demand and emissions:

1. Dense Urban Morphology: The Heat Magnets
   • Areas classified as LCZ 2 (Compact Mid-Rise) and LCZ 3 (Compact Low-Rise) consistently performed the worst. Their tight-knit structures and narrow street canyons effectively trap heat, creating sweltering microclimates that demand more cooling.
2. Energy-Intensive Land Uses: The “Heat Catalysts”
   • The Retail and Industry sectors emerged as major culprits. These land uses act as “heat catalysts,” generating extreme Energy Use Intensity (EUI) often exceeding 200 kWh/m²/yr. This translates directly into massive energy consumption and makes them significant contributors to the city’s overall emissions.
3. The Scale of Residential Development: The Collective Burden
   • While individual homes might have lower EUI compared to commercial buildings, the sheer vastness of the residential sector across the city makes it a highly significant contributor to Bandung’s total energy consumption and emissions. Every degree hotter means more air conditioning for millions.

Rethinking Our Blueprint: Why Conventional Zoning is Falling Short

Perhaps the most compelling insight from my research is the revelation that conventional zoning approaches are no longer sufficient. They simply don’t account for the complex, cross-boundary climate impacts we’re now experiencing. My data clearly illustrates a “heat spillover effect”: energy-intensive commercial zones aren’t just hot themselves; they are directly increasing the energy burden on adjacent residential areas. The heat doesn’t respect property lines or zoning maps.

This critical finding calls for a fundamental shift towards a more adaptive Climate Performance-Based Zoning within Bandung’s Detailed Spatial Plan (RDTR). Instead of merely dictating what can be built in an area, the RDTR must evolve to regulate how it performs environmentally.

Here are concrete pathways for Bandung’s RDTR:

1. Link Building Density (KLB) to UHI Mitigation: In the city’s identified hot zones (LCZ 2 & 3), granting the maximum permitted floor area (Koefisien Lantai Bangunan/KLB) could be made conditional. Developers would need to meet specific climate performance requirements, such as installing cool roofs or green roofs, to unlock higher development potential. This incentivizes sustainable design.
2. Mandate Mitigation via Building Permits (PBG): Strategies like using cool materials (e.g., reflective paints) and integrating vertical vegetation (green walls) can be embedded as standard technical requirements for all new construction or major renovations in identified hot zones (LCZ 2, 3, & 8). This ensures that every new building contributes to cooling the city, not just its own footprint.

Building a Cooler, Resilient, and Energy Efficient Bandung

By embedding this evidence-based approach directly into our regulatory framework, we have the power to fundamentally transform Bandung. This isn’t just about reducing energy bills; it’s about creating a cooler, more comfortable, more resilient, and ultimately more energy efficient Bandung for all its citizens. This project is a call to action for urban planners, policymakers, and developers to collaboratively design cities that thrive in the face of climate change. I’m eager to discuss these findings further and explore how they can be translated into tangible policy in our beloved city.

source:
https://www.linkedin.com/posts/yusuf-ridhan_modeling-uhi-energy-emissions-in-bandung-ugcPost-7352966720115888128-WOBJ?utm_source=share&utm_medium=member_desktop&rcm=ACoAAAtGGkQBsxwMBmX3lEJO8btihnfBCaHqTz4