Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 17 of 17 for “"Compressed natural gas"”.
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Containerized compressed natural gas shipping
… TEU, four cylinders are installed that can store compressed natural gas at 250 bar. Two types of cylinders are tested: cylinders made of steel and cylinders made of carbon fiber. Carbon fiber cylinders were chosen because they are lighter. In addition, two types of compressors are used: …
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One-dimensional simulation of a retrofitted medium duty engine running using compressed natural gas
… for compression ignition (C.I.) engine is the compressed natural gas (CNG). For C.I. engines to operate using CNG, or to be converted as a retrofitted CNG engine, further modifications are required. Previous works reported loss in brake power (BP) and increase in hydrocarbon (HC) emission for …
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STUDYING THE PERFORMANCE OF A QUAD-GENERATION SYSTEM WITH STORAGE FOR IMPROVED ENERGY EFFICIENCY
… system operating strategy optimization. A micro gas turbine, a compressed natural gas supply system, a hot water tank, a single-effect absorption chiller, an adsorption chiller, a solid desiccant coated heat exchanger dehumidifier, an indirect evaporative cooler, and a cooling tower constitute …
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Three Essays in Empirical Economics
… The first essay estimates a demand function for compressed natural gas as a fuel substitute to diesel fuel for firms with hybrid fleets. The data is from the Energy Information Administration, for the years 1989 to 2009, for 47 states. Results show that an increase of $0.10 in the price of diesel …
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Analysis of particulate matter concentration and size distribution in heavy-duty vehicle exhaust emissions
… particle size distribution of the compressed natural gas buses tested was characterized by a bi-modal particle size distribution; the clean diesel buses had a uni-modal particle size distribution.;The heavy-duty diesel trucks exhibited the Count Median Diameter (CMD) values ranging …
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Dual fuel conversion of a direct-injection diesel engine
Dual fuel pilot-injected diesel natural gas engines offer significant potential to reduce oxides of nitrogen (NOx) and particulate matter (PK emissions while maintaining diesel-like efficiency. A 1994 Navistar T444E turbocharger V-8 diesel engine was converted to dual fuel diesel and compressed …
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A structural health monitoring system for composite pressure vessels
Vehicles that run on compressed natural gas and hydrogen are currently being developed to reduce greenhouse gas emissions and smog. To meet the need for a safe, reliable fuel storage system, a low-cost, acoustic-ultrasonic system has been developed to detect damage in high-pressure storage …
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The role of natural gas as a vehicle transportation fuel
This thesis analyzes pathways to directly use natural gas, as compressed natural gas (CNG) or liquefied natural gas (LNG), in the transportation sector. The thesis focuses on identifying opportunities to reduce market barriers in order to make the US natural gas vehicle market more efficient. We …
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A novel method to determine a national diesel emissions inventory
… was supplemented by studies commissioned by Mossgas and BPSouthern Africa and input to a so-called "emissions inventory" model. This is simply a calculation of the total emissions produced by the vehicle park over a fixed period, usually a year, and takes no account of the dispersion of the …
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Economic implications of natural gas vehicle technology in U.S. private automobile transportation
… imported. With significant domestic conventional gas resources, optimistic projections of unconventional natural gas resources, and the growing international liquefied natural gas (LNG) market, gas prices are expected to remain lower than oil. While natural gas currently provides approximately 24 …
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Adsorption Performance and Cold Plasma Activation of Biochar for On-Site CH₄ Storage and Energy Recovery in Oil Fields
Routine flaring of associated petroleum gas (APG) remains a major source of greenhouse gas emissions in upstream oil production, particularly at remote or infrastructure-limited production sites where gas transportation and processing are uneconomic. Developing a field-deployable, integrated …
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A Quantification Analysis on Potential Use of Recuperated Regenerative Braking Energy from NYCT Subways into Charging Electric Buses
… Currently, this huge fleet has a combination of Compressed Natural Gas (CNG) buses, diesel and hybrid diesel buses. In 2014, the MTA released a total of .27 pounds of carbon dioxide (CO2) gases per passenger mile. Even though on a per passenger-mile basis, emissions from single occupancy vehicles …
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Energy Systems Analysis for a Solar Economy
… we consider biomass thermochemical routes of gasification/Fischer-Tropsch (FT) synthesis and fast-hydropyrolysis/hydrodeoxygenation. For &eta<sub>carbon =70-95%, the synergistic gain of the optimal integrated process is evidenced from the 28-156% lower solar energy consumption compared to …
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Combustion quality and regimes for standard and alternative fuels
… have shown to be a possible alternative to pure gasoline. In this work, the intermediate product in bio-butanol production through acetone-butanol-ethanol (ABE) fermentation, ABE, was studied for the first time as a potential alternative fuel in spark ignition (SI) engines. Various blends of ABE …
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Life cycle sustainability assessment of next generation energy infrastructure in Africa: Is there a case for biohydrogen after biomethane?
The recovery of energy in the form of biomethane gas from inexpensive biodegradable organic wastes is starting to become a cornerstone of green economy investments. It is possible that such installations could serve as a precursor for the infrastructural development of a hydrogen economy, since …