Garuda - Garba Rujukan Digital

Karsten Wehner

Unknown Affiliation

Author-ID : 3420342

Automotive Engineering Control & Systems Engineering Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Transportation

Published : 3 Documents Claim Missing Document

Claim Missing Document

Articles

1

Modelling the Turbocharger Cut Off Application Due to Slow Steaming Operation 12RTA96C-B Engine Karsten Wehner; Hartmut Schmidt; Muhammad Ramadhan Pamungkas
International Journal of Marine Engineering Innovation and Research Vol 1, No 4 (2017)
Publisher : Institut Teknologi Sepuluh Nopember

Out of the total operational costs of a ship, fuel costs account for by far the highest proportion. In view of the global economic situation and the rising oil prices, shipowners and charterers are looking for solutions to cut costs by reducing fuel consumption. Low load operation, also well-known as “slow steaming”, represents the currently most effective and popular measure to cut fuel costs and, in consequence, the total operational costs for increased competitiveness in the market. Low load operation is possible and there is an increasing trend to operate in these very low engine load ranges. As the engines were not designed for this operational condition, various retrofit modifications to the engine can compensate for this. By using low load operation, the reduction of the RPM gives problems when sailing at low speed. A turbocharger (TC) compresses inlet air to a high pressure and after cooling this compressed air it results in higher mass of air in the cylinder. But when running at a low power load this air reaches temperatures that are too low for an optimal combustion process. One of the solution comes from the company Wärtsilä. They install so called “low steam engine kits”. When this kit is installed it allows the engine operators to cut off one turbocharger of the engine, this result’s in a higher RPM for the operating turbochargers. When the remaining TC’s have a higher RPM their efficiency improves and gives the engine more air for combustion.The goal of this Bachelor thesis is to make a calculation modelling and prove that by switching off one or more turbocharger on the system will improve the efficiency in slow steaming operation. Beside that, this thesis is aims to estimated the performance of the engine in both operation condition.

Data-Based Modelling of Ship Propulsion for A 2500 TEU Feeder Container Ship Jefferson Marcel Soadamara; Wolfgang Busse; Karsten Wehner
International Journal of Marine Engineering Innovation and Research Vol 5, No 4 (2020)
Publisher : Institut Teknologi Sepuluh Nopember

A sea-going vessel will always face the risk of rough weather along with its voyages. The focus of this paper is on the creation of a data-based model to estimate the power increase or speed loss due to the influence of weather, by using resistance estimation theories and added resistance approximation methods along with additional assisting tools. Furthermore, a theoretical simulation is done in order to benchmark and correct the model setup. The analysis of simulation results shows that at the available data range, the model proves reasonably precise within its capabilities, for academic applications. The general behavior of the model complies with common ship theory, however, does not perfectly resemble the speed-power relation of the ship’s recorded data averages. The analysis suggests that the model is most compatible with the shipload draft of 9,0 to 9,5 meters and within the speed of 19 to 22 knots. The lack of data outside the typical operating range disables the ability to verify the model correspondingly. The theoretical simulation proves valuable in assessing ship data-based models.

Economic Analysis of Bio-Diesel for Agriculture Purpose of Indonesian Farm Muhammad Bismadver Budiman; Karsten Wehner; Steffen Loest
International Journal of Marine Engineering Innovation and Research Vol 4, No 2 (2019)
Publisher : Institut Teknologi Sepuluh Nopember

Based on the 2015 annual energy forecast from Indonesia’s Agency for the Assessment and Application of Technology (BPPT), if present trends in energy usage continue unaltered, transport fuel consumption in Indonesia will increase on average almost 5% per year through 2050. Currently, liquid fossil fuel accounts for around 35% of Indonesia’s energy demand across all sectors. From various renewable energy and possible alternative fuels to replace the consumption of fossil fuels, biodiesel is projected to have potential to be developed regarding to the simple production process and affordable feed stocks. Biodiesel, as diesel engine fuel alternative, receives more attention among many feasible options. Biodiesel as one of the renewable energies, biodegradable and nontoxic fuel is expected to be one of the solutions. With the affordable feed stocks that can be obtained from various organic source like vegetable oils or animal fats and also the simple production, From the discussion of this Bachelor Thesis, the economic feasibility, necessary equipment and the time of storage of the biodiesel will be analyzed for biodiesel production plant including investment cost of making the biodiesel production plant by calculating the capital cost and the operational cost of a 5000-ton annual capacity of biodiesel. The purpose of this study is to analyze the investment of the biodiesel production facility by using a feasibility study method by using four parameters of economic feasibility study namely Net Present Value (NPV), Internal Rate of Return (IRR), Payback Period (PP), and the Profitability Index (PI) for assessing the Investment. Th result obtained is that the biodiesel production facility with the annual production of 5000 ton of biodiesel is feasible

Title

Found 3 Documents
Search

Abstract

Abstract

Abstract

Title Search

Found 3 Documents Search

Abstract

Abstract

Abstract

Title

Found 3 Documents
Search