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Muliawan, Rizki
Jurusan Teknik Refrigerasi Dan Tata Udara, Politeknik Negeri Bandung
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Assistance in the Development of Nutrient Water Cooling Technology for Hydroponic Farmers Annisa Syafitri Kurniasetiawati; Bowo Yuli Prasetyo; Parisya Premiera Rosulindo; Windy Hermawan Mitrakusuma; Apip Badarudin; Muhammad Akmal; Rizki Muliawan
Jurnal Difusi Vol. 9 No. 1 (2026): Jurnal Difusi
Publisher : Pusat Penelitian dan Pengabdian Masyarakat (P3M) Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The Indonesian hydroponic industry is expanding rapidly as awareness of food security grows. The JTRA-POLBAN Community Service Team mentored Ndaru Farm MSME in Batujajar Village, focusing on aquaponics. Greenhouse nutrient water temperatures can reach 38°C, exceeding the ideal 20–23°C and affecting harvests. Therefore, a water chiller-based cooling system was developed and tested on hydroponic tables. System performance was monitored through electricity consumption, temperature stability, and the growth of lettuce (Lactuca sativa) and bok choy (Brassica rapa). Growth parameters included weekly plant height and final harvest weight, compared with a control without cooling. Results showed that cooling maintained stable temperatures of 20–22°C, while without cooling they fluctuated at 28–29°C. Cooling increased lettuce height but reduced its mass, whereas bok choy experienced significant mass gain. Energy analysis confirmed cooling technology is more profitable for sustainable bok choy cultivation.
Retrofitting Alternatif Refrigeran Ramah Lingkungan R-290 dengan R-134a pada Trainer Unit Instalasi Sistem Refrigerasi Rizki Muliawan; Muhammad Akmal; Parisya P Rosulindo; Annisa S Kurniasetiawati
Jurnal Teknik Terapan Vol. 5 No. 1 (2026): April
Publisher : P3M Politeknik Negeri Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25047/jteta.v5i1.120

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.
ANALYSIS OF THE EFFECT OF NOISE INTENSITY DB(A) IN THE PRODUCTION PROCESS ON HEARING LOSS IN A COMPRESSOR MANUFACTURING PLANT Nurul Dwi Andara; Muhammad Akmal; Ade Suryatman Margana; Nani Yuningsih; Wirenda Sekar Ayu; Rizki Muliawan
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.
Analisis Risiko Lingkungan Akibat Pajanan PM10 dan PM2.5 Udara Ambien Pada Pedagang Kaki Lima di Kota Bandung Muliawan, Rizki; Yuningsih, Nani; Mubarak, Abdullah Muiz; Sumeru, Sumeru; Sugiyarto, Sugiyarto; Akmal, M
Jurnal Ilmu Alam dan Lingkungan Vol. 17 No. 2 (2026): Jurnal Ilmu Alam dan Lingkungan
Publisher : Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70561/pz79w269

Abstract

Pencemaran udara PM10 dan PM2.5 yang berasal dari kendaraan bermotor di kawasan perkotaan berdampak negatif terhadap kesehatan, terutama pedagang kaki lima (PKL). Penelitian ini bertujuan untuk menganalisis konsentrasi PM10 dan PM2.5 serta menilai tingkat risiko kesehatan menggunakan metode Risk Quotient (RQ) terhadap PKL di dua lokasi di Kota Bandung, yaitu Jalan Dipati Ukur dan Jalan Lengkong Kecil. Penelitian ini menggunakan metode kuantitatif deskriptif dengan pendekatan Analisis Risiko Kesehatan Lingkungan (ARKL). Pengukuran langsung menggunakan alat PM Counter HT-9600 pada tiga titik di tiap lokasi selama empat hari. Jumlah sampel terdiri dari 36 pedagang di lokasi 1 dan 31 pedagang di lokasi 2. Rata-rata PM10 dan PM2.5 di lokasi 1 lebih tinggi, yaitu 44,01 μg/m³ dan 39,71 μg/m³ dibandingkan dengan Lokasi 2 sebesar 29,20 μg/m³ dan 26,23 μg/m³. Keduanya masih memenuhi baku mutu PP No. 22/2021. Nilai ISPU (Indeks Standar Pencemar Udara) untuk PM10 dan PM2.5 untuk Lokasi 1 adalah 47,01 dan 80,34, sedangkan lokasi 2 sebesar 39,60 dan 63,44 (kategori Baik hingga Sedang). Nilai Intake PM10 dan PM2.5 di Lokasi 1 adalah 0,0473 mg/kg/hari dan 0,0397 mg/kg/hari, sedangkan di Lokasi 2 sebesar 0,0286 mg/kg/hari dan 0,0263 mg/kg/hari. Sebanyak 21 pedagang di Lokasi 1 memiliki RQ PM10 > 1 dan 29 pedagang RQ PM2.5 > 1, yang menunjukkan kategori tidak aman. Sebaliknya, seluruh responden di Lokasi 2 memiliki RQ ≤ 1 (kategori aman). Upaya mitigasi terhadap dampak polusi udara adalah pemantauan kualitas udara secara rutin dan penggunaan masker N95.
Rancang Bangun Sistem Monitoring Kualitas Udara Berbasis UAV Menggunakan ESP32 dan Komunikasi LoRa Ilham Nurarifin Haryawan; Wirenda Sekar Ayu; Rizki Muliawan
Prosiding Industrial Research Workshop and National Seminar Vol. 17 No. 1 (2026): Prosiding 17th Industrial Research Workshop and National Seminar (IRWNS)
Publisher : Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/irwns.v17i1.7207

Abstract

Pemantauan kualitas udara menggunakan sistem stasioner memiliki keterbatasan jangkauan spasial dan fleksibilitas pengambilan data. Penelitian ini bertujuan untuk merancang dan mengimplementasikan sistem pemantauan kualitas udara berbasis Unmanned Aerial Vehicle (UAV) menggunakan ESP32, sensor MQ-135, DHT22, dan komunikasi LoRa SX1278 untuk mengukur konsentrasi karbon dioksida (CO₂), suhu, dan kelembapan secara real-time. Sistem terdiri atas unit transmitter yang dipasang pada UAV, unit receiver yang menerima data melalui LoRa, serta platform Internet of Things (IoT) yang menampilkan data dan menyimpannya dalam format CSV. Kinerja sensor dievaluasi melalui kalibrasi terhadap alat ukur referensi menggunakan analisis regresi linier. Hasil kalibrasi menunjukkan nilai R² sebesar 0,8369 untuk CO₂, 0,7975 untuk suhu, dan 0,9571 untuk kelembapan. Sistem berhasil memantau CO₂ pada rentang 430–770 ppm, suhu 30,2–31,9 °C, dan kelembapan 59,3–65,0% RH selama pengoperasian UAV. Hasil tersebut menunjukkan bahwa sistem yang dikembangkan mampu melakukan akuisisi dan transmisi data secara real-time serta memberikan solusi yang portabel dan fleksibel untuk pemantauan kualitas udara.
Co-Authors A S Margana A.P. Edi Sukamto Ade Suryatman Margana Afifah, Andini Luthfiyyah Akmal, M Amalia Nur Fadhillah 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 Ilham Nurarifin Haryawan Karan, Sandy Kasni Sumeru Khakim, Nur KURNIASETIAWATI, ANNISA Markus Markus Marzuqi, Mubarak Muhammad Adi Khoirul Umam Muhammad Akmal Muhammad Akmal Muhammad Luthfi Nanda Fauzan Pratama Nani Yuningsih Nani Yuningsih, Nani Nur Khakim Nuriyadi, Muhammad Nurrohman Nurrohman Nurul Dwi Andara Parisya P Rosulindo Parisya Premiera Rosulindo Pramudantoro, Triaji Pangripto Prasetyo, Bowo Yuli Ramdhani, Muhammad Rizal Rizkyana, Qobul Septyansah, Septyansah Shodiya Sulaimon Sugiyarto Sugiyarto Sumeru, Sumeru Syarif Hidayat Tandi Sutandi Toto Tohir Triaji Pangripto Pramudantoro Triaji PP Vanra Fitri Zuhdiyah Wang, Fujen Windy Hermawan Mitrakusuma Wirenda Sekar Ayu YP, Bowo Yudi Prana Hikmat