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All Journal Rotasi Bulletin of Electrical Engineering and Informatics INTENSIF: Jurnal Ilmiah Penelitian dan Penerapan Teknologi Sistem Informasi Knowledge Engineering and Data Science Journal of Energy, Mechanical, Material and Manufacturing Engineering Journal of Electronics, Electromedical Engineering, and Medical Informatics Buletin Ilmiah Sarjana Teknik Elektro Journal of Robotics and Control (JRC) Jurnal Teknik Informatika (JUTIF) International Journal of Mechanical Engineering Technologies and Applications (MECHTA) International Journal of Robotics and Control Systems Mechanical Engineering for Society and Industry Proceeding International Pelita Bangsa Journal of Environment and Sustainability Education Control Systems and Optimization Letters Indonesian Journal of Electronics, Electromedical Engineering, and Medical Informatics Jurnal Teknokes
Wahyu Caesarendra
Dosen Jurusan Teknik Mesin, Fakultas Teknik, Universitas Diponegoro
Aerospace Engineering Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Transportation Other

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Thermal and Acoustic Properties of Coir Fiber Reinforced Epoxy Composites Othman, Asaad Belal; Winarto, Winarto; Bintarto, Redi; Caesarendra, Wahyu; Alhajj, Baligh
International Journal of Mechanical Engineering Technologies and Applications Vol. 7 No. 2 (2026): July - December 2026
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2026.007.02.6

Abstract

The building industry accounts for roughly one-third of worldwide energy use and CO? emissions, with a significant portion spent on heating and cooling. Improving energy efficiency through effective insulation materials is critical for reducing this global demand and mitigating climate change. This paper explores the use of coconut coir fiber—a renewable, low-density byproduct of coconut processing—as a reinforcement in epoxy coatings for metal ceilings. To improve fiber-matrix bonding, the coir fibers were treated with alkali (5% NaOH) before being added to a bisphenol-A epoxy resin in 0–50 wt.% ratios and hand-laminated to 0.3 mm galvalume steel panels. Thermal and acoustic performance were measured under solar radiation (~900–1200 W/m²) and a simulated rain impact (~17 L/min flow of water), respectively. Findings depict a significant enhancement of insulation with an increased content of coir. Thermally, the 50 wt.% coir sample reduced thermal conductivity by more than 50% compared to pure epoxy and kept interior temperatures 5–6 °C lower than ambient. Acoustically, the 50 wt.% coir composites achieved a sound transmission loss of approximately 24 dB at 2000 Hz, which is double the performance of the pure epoxy ceiling (12 dB). The noise of rain in rooms was also reduced by approximately 12 dB under the 50% corrugated roof. These results demonstrate that the low density, porous nature, and capacity to trap air are major contributors to the thermal and acoustic insulation of coir. Finally, coir-epoxy finishes are an environmentally friendly, sustainable solution for enhancing energy efficiency, thermal comfort, and noise mitigation in buildings.
Co-Authors Abdullayev, Vugar Achmad Widodo Ade Silvia Handayani Admi Syarif Agus Sudarmanto Agus Wantoro Ahmad Rofii Ahmad Taqwa Ahmed, Abdussalam Ali Alfian Ma’arif Alhajj, Baligh Amrinsani, Farid Anant Athavale, Vijay Andini, Dwi Yana Ayu Ariesma Githa Giovany Aryananda, Rangga Laksana Asriyadi Asriyadi Aviv Fitria Yulia Baharsyah, Baharudin Adi Brilliant, Muhammad Zidan Busono Soerowirdjo Dewi, Deshinta Arrova Dwi Kartini Dwi Kartini, Dwi DWI RAMADHANI Dyah Titisari, Dyah Endro Yulianto Eva Yulia Puspaningrum Fadillah, Wa Ode Nurul Faikul Umam Faiza, Linda Ziyadatul Fara Disa Durry Faris, Fakhri Al Fatma Indriani Fitriana, Lutfatul Forra Wakidi, Levana Furizal, Furizal Gołdasz, Iwona Gupta, Munish Kumar Hari Soetanto Her Gumiwang Ariswati Herianto Herianto Hidayat, Fathur Rachman Humairah, Sayyidah I Gede Susrama Mas Diyasa Ichwan Dwi Nugraha Ikna Awaliyani Irwan Budiman Irwan Budiman Joga Dharma Setiawan Krolczyk, Grzegorz Kusnanto Mukti Wibowo Leni Novianti Luthfiyah, Sari Maharani, Siti Mutia Mahmood, Muhammad Azim Mahmud Mahmud MAJDOUBI, Rania Mochammad Ariyanto Mochammad Denny Surindra Muhammad Fuad Muhammad Reza Faisal, Muhammad Reza Muliadi Nurman Setiawan Nyayu Latifah Husni, Nyayu Latifah Othman, Asaad Belal Pamanasari, Elta Diah Prakoso, Bagas Angger Pranoto, Kirana Astari Putri, Farika Radityo Adi Nugroho Rahman, M. Arief Ramadhan, Bahrurrizki Ramadhan, Yogi Reza Redi Bintarto, Redi REKIK, Chokri Rizki Edmi Edison Rozaq, Hasri Akbar Awal Rudi Irawan Sagita, Muhamad Rian Samudra, Alan Saragih, Triando Hamonangan Septiani, Fahira Setiawan, Joga D Setioningsih, Endang Dian Siena, Laifansan Silvian, Fawaida Sitompul, Carlos R Sri Hastuty, Sri Sumarti, Heni Suryanta, Made Dwi Pandya Suwarno, Iswanto T P, Moch Prastawa Assalim Triwiyanto Triwiyanto Triyanna Widiyaningtyas Utomo, Bedjo V.H, Abdullayev Wahyu Dwi Lestari Winarto Winarto Wulandari, Dessy Tri YILDIZ, Oktay Zy, Ahmad Turmudi