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Muliawan, Rizki
Jurusan Teknik Refrigerasi Dan Tata Udara, Politeknik Negeri Bandung
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ANALYSIS OF THE EFFECT OF NOISE INTENSITY DB(A) IN THE PRODUCTION PROCESS ON HEARING LOSS IN A COMPRESSOR MANUFACTURING PLANT Andara, Nurul Dwi; Akmal, Muhammad; Margana, Ade Suryatman; Yuningsih, Nani; Ayu, Wirenda Sekar; Muliawan, Rizki
JURNAL CRANKSHAFT Vol. 9 No. 1 (2026): Jurnal Crankshaft Vol. 9 No. 1 (2026)
Publisher : Badan Penerbit Universitas Muria Kudus

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24176/cra.v9i1.16743

Abstract

Noise is one of the most common physical hazards in industrial environments and may adversely affect both health and workplace comfort. This study aims to analyze noise intensity during production processes and its impact on workers’ comfort perception at compressor manufacturing plant, as well as to estimate the potential risk of permanent hearing loss using the Noise-Induced Permanent Threshold Shift (NIPTS) method based on ISO 1999:2013. A descriptive quantitative approach was employed, consisting of noise measurements at five production points over three working days and the distribution of questionnaires to 31 respondents to assess perceptions regarding comfort, communication disturbance, concentration, and physical complaints. The results indicated that noise intensity in several areas, particularly frame manufacturing and sandblasting, exceeded the threshold limit of 85 dB(A), with the highest level reaching 117.6 dB(A). NIPTS calculations showed that workers in these areas were at high risk of permanent threshold shifts, with values ranging from 31.28 to 69.77. In contrast, the bending machine area presented noise levels closer to the threshold, with relatively low NIPTS values (0.30–0.71), suggesting a lower risk of long-term auditory impairment. Questionnaire results revealed that 50% of workers perceived noise levels as severe, 29.2% as moderate, and 20.8% as mild. The majority also reported that noise slightly interfered with their concentration and comfort, although most were able to adapt to the working conditions. In conclusion, noise exposure in the production environment of compressors manufacturing plant poses both auditory and non-auditory health risks. Therefore, comprehensive noise control strategies, including engineering modifications, administrative measures, and consistent use of personal protective equipment, are required to safeguard workers’ health and support sustainable productivity.
Retrofitting Alternatif Refrigeran Ramah Lingkungan R-290 dengan R-134a pada Trainer Unit Instalasi Sistem Refrigerasi Muliawan, Rizki; Akmal, Muhammad; Rosulindo, Parisya P; Kurniasetiawati, Annisa S
Jurnal Teknik Terapan Vol. 5 No. 1 (2026): April
Publisher : P3M Politeknik Negeri Jember

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Abstract

R-134a refrigerant has been widely used in industrial and commercial refrigeration systems; however, its high global warming potential (GWP) of up to 1430 has driven the search for more environmentally friendly alternatives. R-290 (propane) is considered a promising candidate due to its zero ozone depletion potential (ODP) and very low GWP of only 3, along with thermodynamic properties that are relatively comparable to those of R-134a. This study aims to evaluate the performance of a refrigeration system retrofitted from R-134a to R-290 using two types of expansion devices, namely a thermostatic expansion valve (TXV) and a capillary tube. The experimental method was conducted by varying the refrigerant charge based on equal mass and maintaining similar evaporator temperature conditions under no-load operation. The results indicate that the system using R-290 is capable of delivering cooling performance comparable to that of R-134a for both types of expansion devices. Furthermore, the use of R-290 results in lower energy consumption, with energy savings ranging from 8% to 9% compared to R-134a. This comparable performance suggests that the thermodynamic properties of R-290 are sufficiently compatible to replace R-134a in the same system without requiring significant modifications to the main components. The observed performance differences are primarily influenced by flow characteristics and the expansion process associated with each type of expansion device. Therefore, R-290 demonstrates strong potential as an environmentally friendly and energy-efficient alternative refrigerant, particularly for retrofit applications in existing refrigeration systems.
Co-Authors A S Margana A.P. Edi Sukamto Afifah, Andini Luthfiyyah Amalia Nur Fadhillah Andara, Nurul Dwi Andriyanto Setyawan Annisa S Kurniasetiawati AP Edi S AP. Edi Sukamto Apip Badarudin AR Lukitobudi Asep Hidayat Azel Adnal A Cavin, Michel Cecep Sunardi E Erham Falahuddin F, MA Hassan Muhammad Sumeru Hidayat, Muhamad Ardi Ilham Azmy Karan, Sandy Kasni Sumeru Khakim, Nur Kurniasetiawati, Annisa S Margana, Ade Suryatman Markus Markus Muhammad Adi Khoirul Umam Muhammad Akmal Muhammad Luthfi Nanda Fauzan Pratama Nani Yuningsih, Nani Nur Khakim Nuriyadi, Muhammad Nurrohman Nurrohman Pramudantoro, Triaji Pangripto Prasetyo, Bowo Yuli Ramdhani, Muhammad Rizal Rizkyana, Qobul Rosulindo, Parisya P Septyansah, Septyansah Shodiya Sulaimon Syarif Hidayat Tandi Sutandi Toto Tohir Triaji Pangripto Pramudantoro Triaji PP Vanra Fitri Zuhdiyah Wang, Fujen Wirenda Sekar Ayu YP, Bowo Yudi Prana Hikmat