Cleaner Energy, Cooler Systems, Sustainable Future

The Energy and Environment Research Group (REGEN) at the Department of Mechanical Engineering, Universitas Indonesia, develops efficient energy systems, environmentally friendly refrigeration and renewable fuels for Indonesia.

Explore Our Research

470+

Scopus-indexed publications

5,400+

Scopus citations

faculty researchers

60+

partner institutions

countries

Our Mission

Thermal science for Indonesia’s energy transition

REGEN turns thermal science into practical solutions for Indonesia’s energy transition. We optimize how energy is converted, stored and used. We replace harmful refrigerants with natural ones. We turn biomass and waste into clean fuel and power.

About Us

Research Focus

Four connected research areas, from laboratory experiments to industrial-scale systems.

Energy System Optimization

Thermoeconomic and multi-objective optimization of power plants, cascade refrigeration and HVAC systems.

Illustration: vapour-compression refrigeration cycle with natural refrigerant R290

Refrigeration and Heat Transfer

Natural refrigerants, two-phase flow in microchannels, ice slurry, heat pipes and absorption chillers.

Illustration: porous adsorbent capturing CO2 and storing CH4

Adsorption and Gas Storage

Activated carbon and bio-MOF adsorbents for methane storage, CO₂ capture and adsorption cooling.

Illustration: biomass gasification producing syngas, hydrogen and power

Biomass and Waste-to-Energy

Biomass gasification, fluidized bed systems, hydrothermal carbonization and thermal energy storage.

Why REGEN

REGEN combines laboratory experiments, industrial-scale testing and system modelling. Our work serves industry, government and coastal communities, from power plants to fishing boats.

Four faculty researchers with 470+ Scopus-indexed publications
Laboratory experiments and industrial-scale testing
60+ partner institutions in 15 countries
Industry and community projects across Indonesia

REGEN researchers working in the team room

Research Highlights

Recent work from each REGEN member. Browse all 470+ papers on the Publication page.

Energy System Optimization · Prof. Nasruddin

Optimizing geothermal multigeneration

A geothermal-driven system that co-produces several useful outputs, optimized for energy, exergy and exergy-economic performance with a multi-objective genetic algorithm (MOGA).

Energy 330, 136653 (2025) · Read the paper →

Refrigeration and HVAC · Dr.-Eng. Arnas

Absorption chillers at partial load

A dynamic model of a single–double-effect absorption chiller with variable thermal conductance, used to study how the chiller behaves during partial-load operation.

Applied Thermal Engineering 218, 119424 (2023) · Read the paper →

Two-Phase Flow · Dr. Agus S. Pamitran

R290 flow boiling in mini channels

Experiments on the boiling heat transfer coefficient, pressure drop and flow patterns of the natural refrigerant R290 (propane) in a horizontal mini channel.

J. Adv. Res. Fluid Mech. Therm. Sci. 131(2), 169–182 (2025) · Read the paper →

Biomass and Waste-to-Energy · Prof. Adi Surjosatyo

More hydrogen from sago waste

Gasification of sago bagasse with an Al₂O₃ catalyst to raise the hydrogen content of the syngas, turning sago-processing waste into clean fuel.

Int. J. Hydrogen Energy 136, 60–66 (2025) · Read the paper →

See all publications →

Latest News

Awards, grants, new publications and activities.

REGEN laboratory at the Department of Mechanical Engineering, Universitas Indonesia

REGEN launches its new website

The Energy and Environment Research Group (REGEN) at Universitas Indonesia now has a dedicated website presenting its people, research themes, roadmap and...

New study on industrial-scale wraparound loop heat pipes for HVAC

REGEN researchers report experiments on industrial-scale wraparound loop heat pipes for heating, ventilation and air-conditioning systems in Energies (2026).

REGEN researchers recognised in FTUI research awards

Dr.-Eng. Arnas and Dr. Agus Sunjarianto Pamitran have received research awards from the Faculty of Engineering, Universitas Indonesia (FTUI).

All news →

Collaborating Institutions

Based on co-authored publications of REGEN members.

Indonesia

National Research and Innovation Agency (BRIN)Universitas Gadjah MadaInstitut Teknologi Sepuluh NopemberIPB UniversityUniversitas Sebelas MaretUniversitas TrisaktiUniversitas Negeri JakartaUniversitas PertaminaUniversitas Sumatera UtaraUniversitas CenderawasihUniversitas SriwijayaMinistry of Energy and Mineral ResourcesPertamina

Japan

Waseda UniversityThe University of TokyoKyushu UniversityTohoku UniversityTokyo Institute of Technology

South Korea

Chonnam National UniversityPukyong National University

Malaysia & Brunei

Universiti Teknologi MalaysiaUniversiti Tenaga NasionalUniversity of MalayaSunway UniversityUniversiti Kuala LumpurUniversiti Brunei Darussalam

Europe, America & Australia

RWTH Aachen University (Germany)INSA Lyon / CNRS (France)University of Illinois Urbana-Champaign (USA)University of Technology Sydney (Australia)

… and more than 60 partner institutions in 15 countries in total.