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 20 of 67 for “"Expander"”.
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Expander graphs
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1993.
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Design and testing of experimental free-piston cryogenic expander
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1999.
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ANALYSIS OF A ROTATING SPOOL EXPANDER FOR ORGANIC RANKINE CYCLE APPLICATIONS
Increasing interest in recovering or utilizing low-grade heat for power generation
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List decoding expander-based codes via fast approximation of expanding CSPs
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-08-01
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The Acoustic Expander: A New Expansion Machine for Use in Cryogenic Refrigeration
The acoustic expander is a new expansion machine with potential applications to cryogenic refrigeration and liquefaction. Cryogenic expansion machines produce mechanical energy from the expansion of a working fluid from high-pressure to low-pressure thereby cooling the low-pressure fluid for use in …
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Modelling of a floating piston expander employed in a 10 K cryocooler
… a counter-flow heat exchanger, and an expander to expand the working fluid. The work of the expanding cold gas is transmitted up a floating piston and is dissipated by gas flows in and out of a warm volume. Flow through the cold volume is controlled by smart electromagnetic valves. …
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Design, analysis and experimental investigation of a new scroll expander based trigeneration system
… heat is used to generate power through a scroll expander and a portion of the heat is used in an ejector cooling system. The residual heat which is normally released to the environment in this type of power cycle is captured as much for hot water heating or space heating. Ammonia-water is used …
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Development of a floating piston expander control algorithm for a Collins-type cryocooler
… helium flow through this gap to allow for steady expander operation. A numerical quasi-steady thermodynamic model is developed for the piston cycle. The model determines the steady state pressure distribution of the reservoirs for an ideal expander with no helium flow through the piston-cylinder …
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Sustainable design and durability of domestic micro combined heat and power scroll expander systems.
… components of three different micro-CHP scroll expander systems was conducted. This was performed in order to identify the possible tribo-mechanical effects (abrasion, adhesion, cavitation, fatigue) which occur on the substrate of these components during the operation of the scroll which can …
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Theoretical analysis and experimental investigations of an expander-cycle centrifugal direct injection rocket engine
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2003.
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Conversion of a scroll compressor to an expander for organic Rankine cycle: modeling and analysis
Conversion of a scroll compressor to an expander for organic Rankine Cycle: modeling and analysis
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Untersuchungen an einer Kolbenexpansionsmaschine mit integrierten Wärmeübertragerflächen (Wärmeübertrager-Expander) zur Realisierung eines neuartigen Neon-Tieftemperatur-Prozesses
… zu erzeugen, ohne dafür viele Expander zu verwenden. Diese Einheit wird als Wärmeübertrager-Expander (WE) bezeichnet. Mit einem Arbeitsraum in konischer Grundform wird der Wärmeübergangskoeffizient günstig gestaltet u. die Wärmeübergangsfläche vergrößert. Mehrere …
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Flow modelling of scroll compressors and expanders
… development and use of a scroll machine as an expander to replace a throttle valve has never been reported. This thesis describes the work carried out to develop a two phase scroll expander for use in vapour compression refrigeration systems. By this means the power requirements of the system …
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Bounds on k-Regular Ramanujan Graphs and Separator Theorems
Expander graphs are a family of graphs that are highly connected. Finding explicit examples of expander graphs which are also sparse is a difficult problem. The best type of expander graph in a. certain sense is a Ramanujan graph. Families of graphs that have separator theorems fail to be Ramanujan …
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Design and analysis of a 1 kw Rankine power cycle, employing a multi-vane expander, for use with a low temperature solar collector.
Thesis. 1977. B.S. cn--Massachusetts Institute of Technology. Dept. of Mechanical Engineering.
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Exergoeconomic analysis and optimization of organic Rankine cycles
… temperature heat sources. A Bitzer model scroll expander is used for the prime mover for the system. This expander has a reliable model in which thermodynamic analysis can be done. Various working fluids are explored to investigate which one will provide the most power output and efficiency …
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Contribution to the Characterization of Piston Expanders for Their Use in Small-scale Power Production Systems
Piston expanders are well suited for small scale power generation (<50kW) using heat engines such as Ericsson engine or Organic Rankine Cycle (ORC) system. Both systems offer the possibility to use renewable energy sources and are increasingly considered in light of the economic and environmental …
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Sparse flexibility structures: Design and application
… cost.We first introduce the concept of a??graph expandera??, which is widely used in graph theory, computer science and communication network design areas. We propose that a good flexibility structure possesses the properties of graph expander. Estimation on the performance of an expander …
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A Comparison of Two Air Compressors for PEM Fuel Cell Systems
… for fuel cell applications. Two compressor and expander technologies are discussed in this paper: the Opcon 1050 positive displacement twin-screw compressor and expander, and a Honeywell turbocompressor and expander. The effect of these compressors and expanders on the system at maximum load, …
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