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Herlin Sumarna
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Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Dentistry Electrical & Electronics Engineering Energy Engineering Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Public Health Veterinary

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PERANCANGAN HEAT EXCHANGER SISTEM PEMANAS AIR BERBASIS SISTEM REFRIGERASI R410A Muhammad Irfan Dzaky; Ahmad Imam Rifa’i; Zainuri Anwar; Baiti Hidayati; Tri Satya Ramadhoni; Toni Okviyanto; Herlin Sumarna; Ahmad Zikri; Ghifari Nasution
Journal Foundry Vol. 7 No. 1 (2024): Journal Foundry
Publisher : Journal Foundry

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Abstract

Ketersediaan air panas dalam lingkungan apartemen memiliki peran krusial dalam memberikan kenyamanan, kebersihan, dan efisiensi bagi penghuninya. Perancangan sistem inovatif pemanas air yang menggabungkan prinsip dasar refrigerasi menjadi sorotan utama, dengan fokus pada pemahaman mendalam mengenai beragam sumber energi, termasuk pemanfaatan energi listrik, tenaga surya, dan panas buangan AC. Keselamatan penggunaan pemanas air juga ditegaskan sebagai hal yang penting, dengan penekanan pada risiko kebakaran akibat kelalaian dan tersengat aliran listrik. Tujuan utama penelitian ini adalah untuk merancang sistem pemanas air yang efektivitas berbasis sistem refrigerasi. Metode penelitian difokuskan pada perancangan sistem pemanas air (Air Conditioning Water Heater/ACWH) dengan prinsip refrigerasi R410a. Hasil perhitungan mengenai dimensi pipa tembaga yang optimal untuk memanaskan air hingga temperatur yang diinginkan, serta faktor termal yang terlibat, dijelaskan secara rinci. Heat exchanger yang digunakan adalah tipe double pipe dengan ukuran panjang pipa tembaga 16,68 meter mampu efektif memanaskan air dari 27°C menjadi 50°C dengan aliran 100 l/jam dengan ukuran diameter pipa 3/8 inci dan 1 1/8 inci dengan dimensi heat exchanger secara keseluruhan 106 cm x 69,3 cm
Pengaruh Beban Operasi terhadap Nilai Net Plant Heat Rate (NPHR) pada Pembangkit Listrik Tenaga Uap Herlin Sumarna; Ramadhoni, Tri Satya; Septano, Gurruh Dwi; Purfaji, Purfaji; Okviyanto, Toni
INSOLOGI: Jurnal Sains dan Teknologi Vol. 5 No. 2 (2026): April 2026
Publisher : Yayasan Literasi Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55123/insologi.v5i2.7977

Abstract

This study aims to analyze the effect of variations in operating load on the Net Plant Heat Rate (NPHR) at a 3×10 MW coal-fired power plant. The independent variables examined are the generator operating loads at 50%, 75%, and 100%, while the dependent variable is the NPHR value. The research data consists of 30 samples distributed proportionally across each load level. Data analysis was performed using a one-way Analysis of Variance (ANOVA) to test the significance of differences in the mean NPHR values across the operating load variations. The results indicate that variations in operating load significantly affect the NPHR value (p-value < 0.05). The highest average NPHR value was obtained at 50% load at 4160 kcal/kWh, then decreased at 75% load to 3861 kcal/kWh, and reached the lowest value at 100% load at 3625 kcal/kWh. These results indicate that an increase in operating load correlates with a decrease in the NPHR value and an increase in the plant’s thermal efficiency. Thus, operating the coal-fired power plant under conditions approaching optimal design capacity can improve fuel efficiency and support the optimization of the plant’s operational performance.
Co-Authors Ahmad Imam Rifa’i Ahmad Zikri Ghifari Nasution Muhammad Irfan Dzaky Okviyanto, Toni Purfaji, Purfaji Ramadhoni, Tri Satya Septano, Gurruh Dwi Toni Okviyanto Tri Satya Ramadhoni zainuri anwar