Algorithm for Determining the Knock Resistance of Pipeline Natural Gases
Sander Gersen,
Martijn van Essen,
Gerco van Dijk,
Howard Levinsky
Issue:
Volume 9, Issue 4, July 2020
Pages:
41-48
Received:
15 July 2020
Accepted:
18 August 2020
Published:
3 September 2020
Abstract: A next-generation algorithm to calculate the PKI methane number is reported. The algorithm is suitable for a wide range of fuel compositions encountered in natural gas pipelines, including admixture of hydrogen and carbon monoxide from renewable sources. Comparison with measurements of knock in a commercial engine shows that the algorithm allows sharp distinction between fuel compositions that do or do not cause engine knock under given operating conditions. Moreover, the algorithm presented here demonstrates superior performance as compared to the existing methods from MWM and AVL. The methane numbers calculated using the PKI MN algorithm for a wide range of fuel compositions are within the uncertainty of the experimental knock measurements. In contrast, methods that are currently used do not predict the knock behavior of the measured gas compositions reliably. A major benefit of the algorithm presented here is that it consists of a simple polynomial equation that can be easily integrated into real-time gas-quality sensing equipment to calculate the PKI MN for assessment of pipeline gas quality or into engine management systems to allow next-generation feed-forward, fuel-adaptive control. In contrast, the current methods such as AVL and MWM need dedicated (and for AVL, proprietary) solvers that iteratively calculate the methane number. Furthermore, given the experimentally verified reliability and ease of implementation of the PKI MN algorithm, we assert that it is an excellent, open-source candidate for international standards for specifying the knock resistance of gaseous fuels.
Abstract: A next-generation algorithm to calculate the PKI methane number is reported. The algorithm is suitable for a wide range of fuel compositions encountered in natural gas pipelines, including admixture of hydrogen and carbon monoxide from renewable sources. Comparison with measurements of knock in a commercial engine shows that the algorithm allows sh...
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Simulation of Photovoltaic Water Pumping System for Small Scale Irrigation and Rural Electrification by Using PVsyst: Case of Madhicho, W/Harerghe, Oromia, Ethiopia
Mohammed Aliyi,
Nade Nuru
Issue:
Volume 9, Issue 4, July 2020
Pages:
49-68
Received:
26 August 2020
Accepted:
21 September 2020
Published:
12 October 2020
Abstract: Energy is one of the key factors for development of the country, and it can gain from different sources, but some of these sources are not environmentally friend, expensive and difficult to transport; like fossil fuel. Using solar energy is the best option to solve this problem. The objective of this study is Simulation of Photovoltaic water pumping system for small scale irrigation and rural electrification by using PVsyst soft-wares. The people living in grid connected system use electric powered pumping or diesel generator for pumping water, but people living in rural off-grid area can't get electric powered pump. Therefore this problem would be solved when they use solar photovoltaic pumping. In this work Madhicho is study area of this study is done at 9.14° latitude and 40.75° longitude. In this study analysis of PV water pump by using PVsyst or RET Screen Expert. Most of the time the major problem of solar PV water pumping system technology has been the wastage of energy in idle manner without using energy which is only used for target of specific purpose and time but in this research when no need of irrigation, the systems require batteries to store the sun’s energy for use during summer periods. Total quantity of water required for irrigation is 145125liter per day the Pump power that can able to pump water from well to storage tank is 20kw the number of PV module to satisfy pump power is 55 and total energy produced from solar panel 22kw. Solar PV water pumping system can be reliably used at where absence of continuous local grid available where as solar PV and battery storage need is critical
Abstract: Energy is one of the key factors for development of the country, and it can gain from different sources, but some of these sources are not environmentally friend, expensive and difficult to transport; like fossil fuel. Using solar energy is the best option to solve this problem. The objective of this study is Simulation of Photovoltaic water pumpin...
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