Pemodelan Termal Supercritical Organic Rankine Cycle Pada Sistem Waste Heat Recovery Kapal Tanker Dengan Variasi Fluida Kerja Dan Variasi Pembebanan Mesin Utama Menggunakan Perangkat Lunak Thermoflex

Arif, Faisal Rahman (2018) Pemodelan Termal Supercritical Organic Rankine Cycle Pada Sistem Waste Heat Recovery Kapal Tanker Dengan Variasi Fluida Kerja Dan Variasi Pembebanan Mesin Utama Menggunakan Perangkat Lunak Thermoflex. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Sebagian besar waste heat pada mesin utama kapal terbawa oleh gas buang yang telah melewati turbocharger. Temperatur gas buang tersebut relatif rendah namun masih memiliki potensi untuk dimanfaatkan. MAN Diesel & Turbo menyatakan bahwa daya listrik dapat dibangkitkan hingga 11% dari daya mesin utama kapal dengan memanfaatkan gas buang pada sistem Waste Heat Recovery (WHR). Salah satu sistem WHR yang dapat digunakan adalah dengan Organic Rankine Cycle (ORC). ORC mengaplikasikan prinsip Rankine cycle menggunakan fluida organik yang memiliki titik didih rendah untuk memperoleh kerja dari sumber panas bertemperatur rendah. Tugas akhir ini menggunakan perangkat lunak Thermoflex untuk melakukan pemodelan sistem WHR dengan variasi fluida kerja dan variasi tingkat keadaan gas buang terhadap pembebanan mesin utama kapal. Fluida kerja yang divariasikan adalah R123, R141b, R245ca, dan R365mfc. Tingkat keadaan gas buang berdasarkan 10% beban, 25% beban, 50% beban, 85% beban, dan 100% beban mesin utama kapal. Selain gas buang, sumber panas dari sistem WHR juga memanfaatkan waste heat dari jacket water. Berdasarkan pemodelan sistem WHR didapatkan bahwa daya listrik terbesar dihasilkan oleh 25% beban mesin utama kapal. Pemodelan sistem WHR terbaik dihasilkan oleh fluida kerja R141b yang menghasilkan daya neto antara 309,65 – 450,59 kW dan memerlukan pendinginan eksternal untuk jacket water yaitu 152,76 kW. Pemodelan tersebut dapat menghemat bahan bakar sebanyak 18,7 gal/jam HFO dan mengurangi 58,2318 gal/jam emisi CO2 pada kondisi operasi SEA GOING. Sedangkan pada kondisi operasi ARR/DEPT pemodelan dapat menghemat 25,1 gal/jam HFO dan mengurangi 78,1614 gal/jam emisi CO2. ============= Most of waste heat from ship's main engine is carried by exhaust gas that has passed through a turbocharger. The exhaust gas temperature is relatively low but it still can be utilized. MAN Diesel & Turbo stated that electrical power could be obtained up to 11% of main engine power by using a Waste Heat Recovery (WHR) system. One of the WHR systems that can be used is Organic Rankine cycle (ORC). ORC applies the principle of rankine cycles using an organic fluid that has a low boiling point to obtain power from low temperature heat sources. This final project used Thermoflex software to perform WHR system modeling with variation of working fluid and variation of exhaust gas levels based on ship's main engine load. The working fluids which were used in modeling were R123, R141b, R245ca, and R365mfc. The exhaust gas levels were based on 10% load, 25% load, 50% load, 85% load, and 100% load of ship's main engine. In addition to the exhaust gas, the heat source of the WHR system also utilized waste heat from jacket water. Based on WHR system modeling, it was found that the largest electric power was generated by 25% load of ship's main engine. The best WHR system modeling was generated by R141b working fluid that generated net power range from 309.65 kW up to 450.59 kW and required external cooling for jacket water which was 152.76 kW. The modeling could save HFO as much as 18.7 gal/hr and reduce 58.2318 gal/hr CO2 emissions under SEA GOING operating condition. While in ARR/DEPT operating condition, it could save 25.1 gal/hr HFO and reduce 78.1614 gal/hr CO2 emission.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Waste Heat Recovery, Organic Rankine Cycle, Jacket Water, Gas Buang, Kapal Tanker, Waste heat recovery, Organic Rankine Cycle, Jacket Water, Exhaust Gas, Tanker
Subjects: H Social Sciences > HE Transportation and Communications > HE566.T3 Tankers
T Technology > TJ Mechanical engineering and machinery > TJ164 Power plants--Design and construction
V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM731 Marine Engines
Divisions: Faculty of Industrial Technology > Mechanical Engineering > (S1) Undergraduate Theses
Depositing User: Faisal Rahman Arif
Date Deposited: 30 Jul 2018 04:49
Last Modified: 30 Jul 2018 04:49
URI: http://repository.its.ac.id/id/eprint/54466

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