Studi Kelayakan Teknis Dan Ekonomis Sistem Waste Heat Recovery Pada Auxiliary Engine

Nasution, Kaila Dharmala (2026) Studi Kelayakan Teknis Dan Ekonomis Sistem Waste Heat Recovery Pada Auxiliary Engine. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Sektor pelayaran berkontribusi signifikan terhadap emisi gas rumah kaca global, sehingga peningkatan efisiensi energi kapal melalui teknologi Waste Heat Recovery System (WHRS) menjadi upaya penting untuk dekarbonisasi. Sebagian besar kajian WHRS masih berfokus pada pemanfaatan panas buang main engine, sementara kajian yang mengintegrasikan evaluasi efisiensi energi, perancangan integrasi teknis pada layout kamar mesin kapal existing, dan analisis kelayakan ekonomis untuk auxiliary engine masih relatif terbatas. Penelitian ini bertujuan menyusun rancangan penambahan WHRS pada layout kamar mesin kapal tanker 30.000 DWT existing, mengevaluasi perubahan nilai Energy Efficiency Design Index (EEDI), serta menganalisis kelayakan ekonomisnya. Metode yang digunakan meliputi perhitungan neraca massa dan energi gas buang auxiliary engine pada beban 75% (1.050 kW), pemodelan siklus Rankine sederhana dengan exhaust gas boiler dan turbin uap, perancangan retrofit tiga dimensi kamar mesin sesuai standar ergonomi ABS, perhitungan EEDI, dan analisis kelayakan investasi berbasis arus kas. Hasil perhitungan menunjukkan potensi panas buang 218,02 kW yang menghasilkan uap 0,094 kg/s pada 7 bar dan 270°C, dengan efisiensi siklus Rankine 14,52% serta daya listrik neto WHRS 29,17 kW atau 2,78% dari daya auxiliary engine. Nilai EEDI turun dari 9,92 menjadi 9,86 gCO2/ton.Nm (0,55%), dengan penghematan bahan bakar 30.492,06 liter per tahun. Dari sisi ekonomi, CAPEX tercatat Rp8.128.182.996 dan OPEX Rp508.011.437 per tahun, namun NPV negatif Rp4.003.355.572, IRR -18,07%, ROI 0,46 kali, dan payback period melebihi umur proyek 10 tahun. Penerapan WHRS pada auxiliary engine terbukti layak teknis namun belum layak ekonomis pada kondisi harga bahan bakar dan struktur biaya saat ini.
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The shipping sector contributes significantly to global greenhouse gas emissions, making ship energy efficiency improvement through the Waste Heat Recovery System (WHRS) an important effort for decarbonization. Most existing WHRS studies focus on main engine waste heat, while research integrating energy efficiency evaluation, technical integration design within an existing engine room layout, and economic feasibility analysis for auxiliary engines remains limited. This study develops a design for adding WHRS to the engine room layout of an existing 30,000 DWT tanker, evaluates the resulting change in the Energy Efficiency Design Index (EEDI), and analyzes its economic feasibility. The methods include mass and energy balance calculations of auxiliary engine exhaust gas at 75% load (1,050 kW), simple Rankine cycle modeling with an exhaust gas boiler and steam turbine, three-dimensional engine room retrofit design per ABS ergonomic standards, EEDI calculation, and cash-flow-based investment feasibility analysis. Results show a waste heat potential of 218.02 kW producing 0.094 kg/s of steam at 7 bar and 270°C, Rankine cycle thermal efficiency of 14.52%, and WHRS net power output of 29.17 kW, or 2.78% of the auxiliary engine's power. EEDI decreased from 9.92 to 9.86 gCO2/ton.Nm (0.55%), with fuel savings of 30,492.06 liters per year. CAPEX was IDR 8,128,182,996 and OPEX IDR 508,011,437 per year, while NPV was negative at IDR 4,003,355,572, IRR -18.07%, ROI 0.46 times, and payback period exceeded the 10-year project life. WHRS application on the auxiliary engine proved technically feasible but not yet economically feasible under the current fuel price and cost structure.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	EEDI, Ekonomi, Gas Buang, Mesin Bantu, WHRS, Auxiliary Engine, Economics, EEDI, Exhaust Gas, WHRS
Subjects:	V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM740 Marine turbines
Divisions:	Faculty of Marine Technology (MARTECH) > Marine Engineering > 36202-(S1) Undergraduate Thesis
Depositing User:	Kaila Dharmala Nasution
Date Deposited:	01 Aug 2026 03:07
Last Modified:	01 Aug 2026 03:07
URI:	http://repository.its.ac.id/id/eprint/141482

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