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INDONESIA
Jurnal Rekayasa Energi
Published by Politeknik Negeri Indramayu
ISSN : 29853427     EISSN : 29853443     DOI : https://doi.org/10.31884/jre
Core Subject : Science, Engineering,
Control & Systems Engineering Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering
Jurnal Rekayasa Energi (JRE) is a scientific journal published by Department of Refrigeration Engineering and Air Conditioning at Politeknik Negeri Indramayu. This journal contains articles based on research and analytical studies in the field of energy engineering, covering new renewable energy, energy conversion, energy management and auditing, energy computing, refrigeration systems and air conditioning, up to control instrumentation. The authors of scientific papers in this journal come from researchers or prospective researchers from various educational, research, and development institutions. This journal is published 2 (two) times a year, namely in June and November.
Arjuna Subject : Energi (semua kategori) - Energi Terbarukan, Keberlanjutan dan Lingkungan
Articles 53 Documents
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DAFTAR ISI JRE VOL 3 NO 2 Rekayasa Energi, Jurnal
JURNAL REKAYASA ENERGI Vol. 3 No. 2 (2024): Jurnal Rekayasa Energi
Publisher : Politeknik Negeri Indramayu

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Abstract

DAFTAR ISI JRE VOL 3 NO 2
COVER JRE VOL 3 NO 2 Energi, Jurnal Rekayasa
JURNAL REKAYASA ENERGI Vol. 3 No. 2 (2024): Jurnal Rekayasa Energi
Publisher : Politeknik Negeri Indramayu

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Abstract

COVER JRE VOL 3 NO 2
ANALISIS STUDI EKSPERIMENTAL DISTRIBUSI KALOR PADA INKUBATOR BAYI PORTABEL Yudhy Kurniawan; Wardika; Karsid; Agustina, Dea
JURNAL REKAYASA ENERGI Vol. 3 No. 2 (2024): Jurnal Rekayasa Energi
Publisher : Politeknik Negeri Indramayu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31884/jre.v3i2.69

Abstract

Dalam penelitian ini menggunakan lampu pijar sebagai media Pemanas Inkubator Bayi Portabel. Alasan dari penelitian ini adalah karena penempatan lampu pijar hanya di satu sisi saja oleh karena itu, tujuannya untuk mengetahui berapa lama persebaran suhu secara merata dan untuk mengetahui jumlah kalor pada setiap titik T1, T2, T3, T4, dan T5. Dalam hal ini untuk masing-masing titik pada ruang Inkubator Bayi dinotasikan T1, T2, T3, T4, dan T5. Metode penelitian ini mencakup studi  literatur, persiapan alat dan bahan, pengujian sistem, dan pengolahan data. Pengujian dilakukan selama dua jam, suhu dipantau dan dicatat tiap lima menit sekali. Hasilnya sebaran suhu dalam inkubator sudah mulai merata mencapai suhu optimal selama 55 menit, dan nilai kalor radiasi yang didapat dari masing titik adalah T1 = 11,27W, T2=8,97W, T3=8,32W, T4= 11,59, T5=13,21W. Suhu lampu dan suhu lingkungan sekitar dapat berpengaruh terhadap persebaran kalor dalam Inkubator Bayi Portabel, semakin besar nilai selisih suhu sumber lampu dengan suhu ruang maka nilai kalor yang dihasilkan semakin besar juga.
ANALISIS PENGARUH KECEPATAN LAJU ALIRAN POMPA TERHADAP PERFORMANSI PADA SISTEM AIR COOLED CHILLER UNTUK PENDINGINAN PUREE MANGGA Setiawan, Aa; Ryanti, Laelia; Maknunah , Jauharotul
JURNAL REKAYASA ENERGI Vol. 3 No. 2 (2024): Jurnal Rekayasa Energi
Publisher : Politeknik Negeri Indramayu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31884/jre.v3i2.70

Abstract

Puree mangga terlebih dahulu dibuat melalui tahapan proses pasteurisasi sebelum dipasarkan. Namun, puree mangga yang telah melewati proses pasteurisasi tidak boleh dibiarkan dalam keadaan panas untuk waktu yang lama, karena hal ini dapat merusak kandungan vitamin yang ada di dalamnya. Oleh karena itu, puree mangga yang telah dipasteurisasi harus segera didinginkan untuk mempertahankan nilai gizinya. Pada penelitian ini digunakan sistem Air cooled chiller menggunakan box freezer untuk mendinginkan puree mangga pasca pasteurisasi. Salah satu komponen penting yang terdapat pada sistem ini yaitu pompa air. Penelitian ini bertujuan untuk mengetahui pengaruh kecepatan laju aliran pompa air terhadap waktu dan efisiensi proses pendinginan pada puree mangga. Oleh karena itu, dilakukan 3 percobaan yang berbeda, yaitu dengan variasi kecepatan laju aliran pompa high, medium, dan low. Dari hasil penelitian menggunakan variasi kecepatan laju aliran high, temperatur produk berhasil dicapai dalam kurun waktu 4 jam 30 menit dengan debit atau laju aliran air yang dihasilkan sebesar 25,75 liter/menit dengan efisiensi rata-rata 51 %, sedangkan pada variasi kecepatan laju aliran medium, temperatur produk berhasil dicapai dalam kurun waktu 5 jam 40 menit dengan debit atau laju aliran air yang dihasilkan sebesar 16,69 liter/menit dengan efisiensi rata-rata 52%. Serta pada variasi kecepatan laju aliran low, temperatur produk berhasil dicapai dalam kurun waktu 6 jam 40 menit dengan debit atau laju aliran air yang dihasilkan sebesar 11,64 liter/menit dengan efisiensi rata-rata 51 %.
ANALISIS KINERJA MESIN PENGERING HASIL PANEN MEMANFAATKAN ENERGI BUANG KONDENSOR DENGAN PENAMBAHAN HEATER Andini Putri Agustin, Dewi; Rian Wahyudi, Permadi; Amri, Fauzan
JURNAL REKAYASA ENERGI Vol. 3 No. 2 (2024): Jurnal Rekayasa Energi
Publisher : Politeknik Negeri Indramayu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31884/jre.v3i2.71

Abstract

Salah satu proses pengolahan hasil panen yang sangat penting adalah pengeringan. Pengeringan bertujuan untuk mengurangi kadar air hingga tingkat yang aman untuk penyimpanan, mencegah pertumbuhan mikroorganisme, dan mempertahankan kualitas produk. Dalam penelitian ini, komoditas hasil pertanian seperti biji kopi, biji jagung, dan kacang tanah dikeringkan dengan menggunakan teknologi yang bekerja dengan memanfaatkan energi buang kondensor dengan penambahan heater. Ketiga produk tersebut telah dikeringkan selama 3 jam. Proses pengeringan berhasil menurunkan kadar air biji kopi hingga 11,9% pada suhu 42,4 ºC, dan kadar air biji jagung hingga 14% pada suhu 44,2 ºC. Kedua produk ini telah berhasil dikeringkan hingga mencapai kondisi yang ideal sesuai dengan standar komoditas panen. Adapun kadar air kacang tanah setelah dikeringkan mencapai 11,6 % pada suhu 45,4 ºC. Dengan kadar air 11,6 % setelah pengeringan awal, kacang tanah belum memenuhi standar kadar air yang dipersyaratkan untuk penyimpanan jangka panjang, sehingga kacang tanah memerlukan waktu pengeringan yang lebih lama dari 3 jam. Sementara itu, untuk sistem heating dehumidifier yang dirancang dengan menggunakan dua heater mampu menghasilkan udara panas sebesar 12,1 kJ/s. Sistem ini memiliki nilai COP yang cukup baik sekitar 4,63 dengan efisiensi sebesar 88%.
SISTEM KONTROL OTOMATIS LAMPU DENGAN PHOTODIODE MENGGUNAKAN RANGKAIAN KOMPARATOR IC UA741 Nurfauziah, Aulia; Febrian Anwar, Syahid; Rizki Amiruddin, Ahmad; Asrila; Amri, Fauzan; Kurnianingtyas, Rahajeng
JURNAL REKAYASA ENERGI Vol. 4 No. 1 (2025): Jurnal Rekayasa Energi
Publisher : Politeknik Negeri Indramayu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31884/jre.v4i1.75

Abstract

This research presents the design and implementation of an automatic lamp control system using a photodiode sensor and an IC UA741 comparator circuit. The aim is to develop a system capable of responding to changes in light intensity in real-time to control the ON/OFF state of the lamp. The method involves designing a light detection circuit with a photodiode, signal conditioning, and voltage comparison using the UA741 comparator. Experimental results show that the output voltage of the photodiode is directly proportional to the incident light intensity. During testing, a maximum voltage of 3.6 V was recorded when the photodiode was exposed to light from 5 LEDs, with the voltage decreasing as the number of light sources was reduced. The system successfully switches the lamp on automatically when the light intensity falls below a defined threshold and switches it off when the light exceeds this threshold. This design offers an energy-efficient lighting control system with simple architecture, low cost, and high responsiveness, making it suitable for household applications or small public areas.
RANCANG BANGUN DAN SIMULASI PROTEUS SISTEM LAMPU OTOMATIS MENGGUNAKAN SENSOR LDR DAN RANGKAIAN KOMPARATOR LM324 Erika; Sya’diah, Halimatus; Desta Azzahra, Lathifah; Amri, Fauzan; Kurnianingtyas, Rahajeng
JURNAL REKAYASA ENERGI Vol. 4 No. 1 (2025): Jurnal Rekayasa Energi
Publisher : Politeknik Negeri Indramayu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31884/jre.v4i1.77

Abstract

This project was developed to create an automatic system that can control a lamp based on the surrounding light conditions. The system uses an LDR (Light Dependent Resistor) sensor to detect light intensity and an LM324 IC as a comparator to determine when the lamp should turn on or off. When the ambient light decreases (such as during nighttime), the resistance of the LDR changes and sends a signal to the LM324 circuit. The main purpose of this system is to enable the lamp to automatically turn on when it gets dark and turn off when it becomes bright again, without the need for manual switching. In this way, the system helps to save electrical energy and improve lighting efficiency, especially in areas that are often forgotten to be turned off, such as porches or garden lights. Based on the testing results, the system functions properly and responds quickly to changes in light. The circuit is also stable and easy to build, as it uses simple and commonly available components. Overall, this system is suitable for various lighting automation purposes in residential areas as well as public spaces.
PERANCANGAN MONITORING SYSTEM UNTUK PHARMACEUTICAL REFRIGERATOR MENGGUNAKAN SENSOR DHT22-MQ9 BERBASIS IOT Maulana, Irfan Maulana; Haryanti, Tri
JURNAL REKAYASA ENERGI Vol. 4 No. 1 (2025): Jurnal Rekayasa Energi
Publisher : Politeknik Negeri Indramayu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31884/jre.v4i1.80

Abstract

The quality of pharmaceutical storage is highly influenced by temperature stability, humidity, and environmental cleanliness. Suboptimal monitoring of pharmaceutical refrigerators can lead to the degradation of active drug ingredients and reduce efficacy. This study aims to design, develop, and evaluate an Internet of Things (IoT)-based Smart Monitoring System for pharmaceutical refrigerators. The system integrates DHT22 and MQ-9 sensors using NodeMCU ESP8266 and the Arduino IoT Cloud platform to monitor temperature, humidity, and the presence of harmful gases in real-time, ensuring drug storage stability. Calibration was performed by comparing sensor readings against the Elitech GSP-6 reference measuring device and the safe threshold standard for carbon monoxide (200 ppm). Test results showed that DHT22 temperature readings ranged from 8–13°C (a deviation of +1–2°C from the reference), while humidity readings were 50–82% (a deviation of -2–3% from the reference). The minimum temperature only reached 8°C (failing to achieve the target of 2°C) due to door-opening activity and refrigerator overloading. The MQ-9 sensor recorded safe CO concentrations (22–42 ppm, equivalent to 11–21% of the 200 ppm limit). CO gas fluctuations remained within tolerance limits, but temperature and humidity occasionally exceeded WHO and BPOM standards (temperature: 2–8°C; humidity: 40–60%). The system provides accurate and responsive monitoring, supporting improved efficiency in automated pharmaceutical storage environment supervision, and has the potential to prevent product degradation due to unsuitable storage conditions.
SISTEM KONTROL TEMPERATUR DENGAN 2 EVAPORATOR UNTUK PENGKONDISIAN LOBSTER Westari, Dwianti; Maknunah, Jauharotul; Kusuma, Aqib Ridwanul
JURNAL REKAYASA ENERGI Vol. 4 No. 1 (2025): Jurnal Rekayasa Energi
Publisher : Politeknik Negeri Indramayu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31884/jre.v4i1.82

Abstract

Freshwater lobsters (Cherax) are cultivated using freshwater, with an ideal water temperature range of 21 to 28 °C. However, achieving and maintaining this temperature range requires a temperature control system. In this case, several control components are used, including a thermostat, TDR, contactor, and selector switch. The thermostat is employed to automatically regulate water temperature, while the TDR functions to reduce the compressor’s workload during startup and to control the operation of the water circulation pump by delaying cooling before circulation begins. The cooling system, equipped with two evaporators, is capable of reaching the initial temperature within 40 minutes and achieving 21 °C in the subsequent 30 minutes. When the system is turned off, the water temperature rises from 21 to 24 °C within 1 hour and 40 minutes.
SISTEM PENDETEKSI KEASLIAN NOMINAL UANG KERTAS UNTUK TUNANETRA DENGAN SENSOR WARNA DAN SISTEM SUARA Zuhair, Alvin; Trisna Pambudi, Kukuh; Syukron, Muhammad; Prasetyaningtyas, Antika; Baggas Pratama, Tegar
JURNAL REKAYASA ENERGI Vol. 4 No. 1 (2025): Jurnal Rekayasa Energi
Publisher : Politeknik Negeri Indramayu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31884/jre.v4i1.83

Abstract

This banknote denomination and authenticity detection system was designed using an Arduino Uno Atmega 328P microcontroller as the main controller. Two sensors were employed: Sensor A (RGB) to read the color patterns of banknotes for denomination classification, and Sensor B combined with an ultraviolet lamp to verify the presence of security features. The data processing flow is sequential: the denomination is first recognized through RGB analysis, followed by authenticity verification under UV detection. The results are delivered through an audio output, announcing the denomination if the banknote is genuine, or issuing a warning “banknote not detected” if it is counterfeit. The evaluation of the system focused on two main parameters: security and efficiency. Security was measured by the accuracy in distinguishing genuine from counterfeit banknotes, the error rate (false positives and false negatives), and the reliability of the audio output in conveying the correct information. Efficiency was assessed in terms of system response time from banknote input to audio output, the success rate of correct denomination recognition, and the ease of use for visually impaired users.

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