JAILCD2025-028: Study on Energy Consumption of Cooling Load in High-Rise Residential Buildings: IKN ASN-HanKam Flats

Abstract

Indonesia's residential energy consumption has increased by 6.5%–7% annually, driven by rapid development and population growth. Cooling systems account for 45%–70% of energy use in tropical regions like East Kalimantan, where high temperatures, humidity, and solar radiation exacerbate thermal loads. The New Capital Nusantara (IKN) state civil service (ASN)-defense and security (HanKam) Flats (Rusunawa) project, part of the capital relocation, highlights the need for energy-efficient design. This study optimizes building facades from its transparent material to reduce thermal loads and cooling energy consumption through non-structural modifications aligned with SNI 03-6389-2020, targeting an OTTV ≤ 35 W/m2. Key parameters include lowering U-Value, Solar Heat Gain Coefficient (SHGC), and window to wall ratio (WWR), prioritizing transparent areas due to their significant impact on thermal loads. Simulations using EnergyPlus in OpenStudio compare existing and optimized conditions, revealing that WWR optimization and glass material replacement effectively reduce cooling loads, with a combined approach offering the greatest energy savings