Input requirements needed to produce an operational profile for a new telecommunications system

2002 ◽  
Author(s):  
R.V. Sandfoss ◽  
S.A. Meyer
Keyword(s):  
Operational Profile

Adaptive flow assignment for CO2 transcritical power cycle (CTPC): An engine operational profile-based off-design study

Energy ◽  
2021 ◽  
Vol 225 ◽  
pp. 120262
Author(s):  
Ligeng Li ◽  
Hua Tian ◽  
Lingfeng Shi ◽  
Jingyu Wang ◽  
Min Li ◽  
...  
Keyword(s):  
Design Study ◽  
Power Cycle ◽  
Operational Profile ◽  
Flow Assignment

scholarly journals An empirical analysis on the operational profile of liquefied natural gas carriers with steam propulsion plants

2020 ◽  
pp. 1-20
Author(s):  
Carlos González Gutiérrez ◽  
Santiago Suárez de la Fuente ◽  
Jean-Marc Bonello ◽  
Richard Bucknall
Keyword(s):  
Natural Gas ◽  
Greenhouse Gases ◽  
Empirical Analysis ◽  
Continuous Monitoring ◽  
Simulation Models ◽  
Energy Performance ◽  
Liquefied Natural Gas ◽  
Liquid Hydrocarbons ◽  
Operational Profile ◽  
Emission Studies

Abstract Liquefied natural gas (LNG) offers negligible NOx and SOx emissions as well as reductions in CO2 compared with other liquid hydrocarbons. LNG is a significant player in the global energy mix, with a projection of 40% increase in demand for the next two decades. It is anticipated that the expected rise in demand will cause the fleet of LNG carriers (LNGC) to expand. This work concentrates on steam-powered LNGC, which accounted for 47% of the LNGC fleet in 2018. It performs an empirical analysis of continuous monitoring data that provide high levels of accuracy and transparency. The analysis is done on data collected from 40 LNGCs for over a year to estimate the fleet's operational profile, fuel mix and energy performance. The findings of this work are relevant for bottom-up analysis and simulation models that depend on technical assumptions, but also for emission studies such as the upcoming Fourth International Maritime Organization Greenhouse Gases study.

scholarly journals Coupled Engine-Propeller Selection Procedure to Minimize Fuel Consumption at a Specified Speed

2021 ◽  
Vol 9 (1) ◽  
pp. 59
Author(s):  
Mina Tadros ◽  
Roberto Vettor ◽  
Manuel Ventura ◽  
Carlos Guedes Soares
Keyword(s):  
Fuel Consumption ◽  
Selection Procedure ◽  
Optimization Procedure ◽  
Operating Point ◽  
Power Prediction ◽  
Ship Routing ◽  
Marine Propellers ◽  
Operational Profile ◽  
Calm Water ◽  
Engine Operating Point

This study presents a practical optimization procedure that couples the NavCad power prediction tool and a nonlinear optimizer integrated into the Matlab environment. This developed model aims at selecting a propeller at the engine operating point with minimum fuel consumption for different ship speeds in calm water condition. The procedure takes into account both the efficiency of the propeller and the specific fuel consumption of the engine. It is focused on reducing fuel consumption for the expected operational profile of the ship, contributing to energy efficiency in a complementary way as ship routing does. This model assists the ship and propeller designers in selecting the main parameters of the geometry, the operating point of a fixed-pitch propeller from Wageningen B-series and to define the gearbox ratio by minimizing the fuel consumption of a container ship, rather than only maximizing the propeller efficiency. Optimized results of the performance of several marine propellers with different number of blades working at different cruising speeds are also presented for comparison, while verifying the strength, cavitation and noise issues for each simulated case.

Energy and Exergy Waste Heat Recovery Analysis of a Bulk Carrier Main Diesel Engine Equipped with Dual-Loop Organic Rankine Cycle

2021 ◽  
Author(s):  
Elias A. Yfantis ◽  
Efthymios G. Pariotis ◽  
Theodoros C. Zannis ◽  
Konstantina Asimakopoulou
Keyword(s):  
Diesel Engine ◽  
Energy Analysis ◽  
Waste Heat ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Ambient Conditions ◽  
Bulk Carrier ◽  
Operational Profile ◽  
Exhaust Heat ◽  
Marine Diesel

The energy and the exergy performance of a dual-loop Organic Rankine Cycle (ORC), which harvests exhaust heat from a two-stroke slow-speed main marine diesel engine of a bulk carrier is examined herein. An energy analysis is adopted to calculate the energy flows to the components of the high-temperature (HT) and the low-temperature (LT) loops of the bottoming ORC and through them, to calculate the energy efficiency of the ORC and the generated power from both expanders. Also, an exergy analysis is implemented to predict the irreversibility rates of the components of both HT and LT loops of the ORC system. Various organic fluids are examined for the HT and the LT ORC loops and the optimum combination is selected based on the results of a parametric analysis. The effect of ambient conditions on the energetic and exergetic performance of the dual-loop ORC is examined. The energy analysis of the bottoming dual-loop ORC is projected to a specific mission operational profile of a bulk carrier for predicting the benefits in fuel cost saving and CO2 and SO2 emission reduction compared to conventional vessel operation.

On the Impact of the Operational Profile on the Ideal Design of a Diving Support Offshore Construction Vessel

2008 ◽  
Vol 45 (02) ◽  
pp. 77-88
Author(s):  
Erlend Hovland
Keyword(s):  
North Sea ◽  
Economical Analysis ◽  
Operational Profile ◽  
Working Day ◽  
The Impact ◽  
The Ideal

Simplified technical and economical analysis of a total of 12 different ship designs has been performed and compared with operational profiles of typical North Sea Diving and Construction vessels. Evaluation of what impact changes to the operational profile has on the best-suited vessel for the operation has also been performed. The paper focuses on optimizing the design to achieve a maximum of days in operation working day. Nomenclature

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