Imansyah Ibnu Hakim - Academia.edu (original) (raw)

Papers by Imansyah Ibnu Hakim

Nucleation and Atmospheric Aerosols, 2020

World Academy of Science, Engineering and Technology, International Journal of Mechanical and Mechatronics Engineering, Oct 8, 2015

Jurnal Teknik Mesin Indonesia, Apr 16, 2023

Kebutuhan listrik merupakan kebutuhan utama masyarakat Indonesia dan setiap orang. Pada tahun 202... more Kebutuhan listrik merupakan kebutuhan utama masyarakat Indonesia dan setiap orang. Pada tahun 2020, terdapat 433 desa tanpa listrik di Indonesia. Indonesia memiliki potensi besar sebagai sumber energi terbarukan. Menurut Kementerian ESDM, total potensi energi terbarukan Indonesia adalah 417,8 gigawatt (GW). Potensi terbesar berasal dari energi surya atau matahari sebesar 207,8 GW. Salah satu cara untuk memanfaatkan potensi energi surya yaitu dengan menggunakan Solar Dish Stirling Engine. Kajian ini menggunakan mesin stirling tipe alpha dan udara sebagai fluida kerja. Kajian ini bertujuan untuk mengetahui kecepatan putaran mesin, daya output mesin stirling, dan efisiensi daya output mesin stirling dengan menggunakan empat variasi panjang lengan piston yaitu 5 cm-5 cm (LH-LC), 5 cm-4,3 cm (LH-LC), 4,3 cm-5 cm (LH-LC), dan 4,3 cm-4,3 cm (LH-LC). Pada kajian ini, digunakan lampu halogen 500 Watt sebagai pengganti sumber panas matahri. Dari hasil kajian, diperoleh kecepatan rpm maksimum pada 852 rpm dengan panjang lengan di 5 cm-5 cm (LH-LC). Hasil kajian juga diperoleh bahwa kecepatan putaran mesin optimum terdapat pada panjang lengan 5 cm-5 cm (LH-LC) dengan nilai 0,39 W pada 839 rpm. Kinerja atau efisiensi mesin stirling ini terbesar yaitu 6,5% pada panjang lengan 5 cm-5 cm (LH-LC). Kata kunci: mesin stirling, parabolic dish concentrator, energi matahari, mesin pembakaran luar.

Seiring dengan pertumbuhan jumlah penduduk Indonesia, kebutuhan akan transportasi semakin meningk... more Seiring dengan pertumbuhan jumlah penduduk Indonesia, kebutuhan akan transportasi semakin meningkat, jumlah kepemilikan sepeda motor dari tahun ke tahun terus mengalami kenaikan. Sepeda motor, khususnya jenis matik merupakan moda transportasi yang sangat vital dalam perannya di hampir seluruh kota di Indonesia. Dari beberapa media cetak ditemukan beberapa keluhan pengguna sepeda motor skutik bahwa performanya kurang baik. Banyak hal yang menyebabkan kurangnya performa ini, salah satunya adalah kondisi udara yang masuk ke ruang bakar. Pada penelitian ini, dirancang alat pendingin udara berbasis termoelektrik dengan tujuan agar udara yang masuk ke ruang bakar mengalami penurunan temperatur. Dengan demikian maka kerapatan partikel udara akan semakin meningkat. Melalui penelitian ini juga diharapkan bahwa campuran udara dan bahan bakar semakin baik sehingga akan terjadi peningkatan performa kendaraan. Pendingin udara berbasis termoelektrik digunakan karena tidak membutuhkan fluida pendingin dan hanya membutuhkan daya yang kecil. Beberapa parameter pengujian yang diukur diantaranya daya motor, torsi motor, konsumsi bahan bakar, temperatur udara dan emisi kendaraan. Parameter-parameter pengukuran tersebut dimonitor selama pengujian dengan menggunakan chassis dyno tester. Dari hasil penelitian ini didapatkan bahwa temperatur udara dapat diturunkan dari 30˚C menjadi 25˚C pada kondisi udara bergerak dan mesin dalam kondisi putaran idle. Namun performa kendaraan mengalami penurunan di bawah kondisi standar. Hal ini disebabkan adanya tahanan aliran udara akibat pemasangan sirip dan pipa pada saluran udara. Hasil lain yang didapatkan adalah penurunan kadar emisi karbon monoksida sebesar 9,8% dari kondisi standar. Kata kunci: thermoelektric cooler, fuel consumption, Emission.

Journal of Advanced Research in Fluid Mechanics and Thermal Sciences

The drying process is the key to the quality of the coffee produced. The allowable moisture conte... more The drying process is the key to the quality of the coffee produced. The allowable moisture content of coffee beans is 12%. The air mass flux, specific humidity, and the drying temperature are varied using a bed dryer drying system combined with a double condenser refrigeration system. Robusta coffee beans are used in this research to obtain the characterization of coffee beans. The highest drying rate constant is obtained by 2.44 × 10-4 s-1 directly proportional to the increased air mass flux and drying air temperature, with a value of 1.701 kg/s m2 and 80 °C, but inversely proportional to the specific humidity, with a value of 7.01 g/kg d.a. The lowest activation energy value was 31.88 kJ/mol when the air mass flux was 1.701 kg/s m2, the drying air temperature was 80 °C, and the average specific humidity was 7.01 g/kg d.a. In this work, the developed correlation is proposed to practically predict the activation energy (EA) and the pre-exponential factor (A) with equation and respe...

AIP Conference Proceedings

Universitas Indonesia. Fakultas Teknik, 1994

Liquid collection system adalah suatu sistem yang digunakan untuk mencairkan asap yang dihasilkan... more Liquid collection system adalah suatu sistem yang digunakan untuk mencairkan asap yang dihasilkan oleh proses pirolisis, Pirolisis adalah proses dekomposisi biomassa tanpa melibatkan oksigen di dalamnya. Asap cair sudah sangat luas digunakan sebagai bahan bakar, zat pengawet dan bahan kimia dasar lainnya. Tulisan ini bertujuan untuk memberikan informasi terkini tentang perkembangan pada bagian liquid collection system dan menyimpulkan dengan beberapa masukan dan strategi penggunaannya. Sedangkan untuk penyusunan menggunakan parameter produk, peralatan dan kondisi operasional yang digunakan dari jurnal-jurnal yang telah ada. Dengan menggunakan liquid collection system yang tepat akan menghasilkan sistem yang lebih efektif dan efisien.

IOP Conference Series: Earth and Environmental Science, 2018

Loop heat pipe is a promising thermal control system, the same as a heat pipe, to realize the eff... more Loop heat pipe is a promising thermal control system, the same as a heat pipe, to realize the efficient release of heat from electric appliances. It is suitable for applications in electronics that have higher power density. Meanwhile, the heat pipe loop (LHP) can also be considered for adoption in the manufacture of solar hot water systems, due to its unique features such as effective thermal conductance and flexible design embodiments. However, the start-up problem of the LHP and transport distance and higher heat release capacity is still existed influencing the operating stability of the device. Base on the problem, this study focuses to carry out work on the developing a novel LHP system in order to provide a robust solution for significant enhance the ability energy transfer. This novel LHP is a conventional LHP that was modified by adding a diaphragm pump to accelerate the fluid transportation (called as hybrid loop heat pipe, HLHP). The pump is installed on the liquid line complete with a reservoir. It will work passively using the wick capillary pressure when there is no sign the occurrence of dry-out. In another hand, the pump was only activated when the evaporator temperature tends increased extremely because of the failure of startup. The experimental result showed that installed diaphragm pump in LHP modified system was able to prevent the occurrence of dry-out and significantly reduced the evaporator temperature. This study will contribute to energy savings and the utilization of renewable energy.

AIP Conference Proceedings, 2020

Open Agriculture

The unpredictable weather in Indonesia results in a less effective conventional coffee beans dryi... more The unpredictable weather in Indonesia results in a less effective conventional coffee beans drying process, which usually uses solar energy as a heat source. This experiment aimed to examine the performance of the coffee beans drying using low-temperature geothermal energy (LTGE) with solar energy as the energy source. Heat pipe heat exchanger, which consists of 42 straight heat pipes with staggered configuration, was used to extract the LTGE. The heat pipes have 700 mm length, 10 mm outside diameter with a filling ratio of 50%, and added by 181 pieces of aluminum with a dimension size of 76 mm × 345 mm × 0.105 mm as fins. LTGE was simulated by using water that is heated by three heaters and flowed by a pump. Meanwhile, to simulate the drying process with conventional methods, a system of solar air collectors made of polyurethane sheets with a thickness of 20 mm and dimensions of length × width × height = 160 cm × 76 cm × 10 cm, respectively, was used in this study. Zinc galvalum...

International Journal of Low-Carbon Technologies

The volume of Indonesian tea exports to the European Union (EU) decreased by 43% in 2014 because ... more The volume of Indonesian tea exports to the European Union (EU) decreased by 43% in 2014 because of the EU setting a maximum residue limit of anthraquinone (AQ) for tea as 0.02 mg/kg. The content of AQ in tea leaves increases when there is incomplete combustion in the combustion of firewood for the energy source of withering and drying of tea leaves. This study aims to develop and test a new concept for the direct use of low-temperature geothermal energy with a heat pipe heat exchanger (HPHE) for the withering of tea leaves as a solution for energy sources free from AQ. The geothermal fluid simulators use water, which is heated by heater and flowed by a pump. The HPHE used consists of 42 heat pipes and 181 fins. The heat pipe used has a length of 700 mm with an outer diameter of 10 mm. Each fin is made of aluminum with a thickness of 0.105 mm and a size of 76 × 345 mm2. The results show that the effectiveness of the HPHE varies from 66% to 79.59%. For 100 g of fresh tea leaves, the ...

Thermal Science and Engineering Progress

Scientific Contributions Oil and Gas, 2022

Air pollution in major cities in many countries has reaching a very concerning level. One of thec... more Air pollution in major cities in many countries has reaching a very concerning level. One of thecause of air pollution is pollution caused by smoke aerosol. Smoke aerosols that has an averageparticle diameter of 0.1 μm – 1 μm can be found in cigarette smoke, diesel vehicle fume, industrialfume and many else. This condition will be worsen by the increase in the number of smokers, motorvehicles and industry. Therefore we need to pursue the control method for that kind of air pollution.In the literature study, it’s found that the cleaning method of air fi ltration for fi ne particle withdimension of 0.01 – 5 μm are by using thermal precipitator. Thermal precipitator is one method ofair fi ltration based on thermophoretic force, which is if there is a temperature difference betweentwo plates, it will cause the force that will push the particles between the two plates toward theplate that has lower temperature. In the effort to help control and reduce the air pollution, for thisstudy we ...

Article history: Received 23 November 2018 Received in revised form 12 February 2019 Accepted 3 M... more Article history: Received 23 November 2018 Received in revised form 12 February 2019 Accepted 3 March 2019 Available online 11 April 2019 The utilization of geothermal energy needs to be improved to support energy diversification and sustainable environmental development. Applying heat pipes as a heat transfer device, will overcome several obstacles to increase the use of geothermal energy, especially low enthalpy geothermal energy. The objective of this study is to investigate the thermal performance of heat pipe usage for heat distribution from low enthalpy geothermal fluids to agricultural dryers. Geothermal fluid simulator (hot water) uses water that is heated by 9000 Watts heater and is flowed by a pump. The heat pipe has a length of 700 mm OD 10 mm, while the heat pipe filling ratio is 50 %. In this experiment, the number of heat pipe used are 42 pieces. The condenser uses a total of 181 fins with a size of 76 x 345 mm. Fin from aluminum material with 0.105 mm thickness is use...

International journal of advanced science and technology, 2020