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Author Ryu, Choon Jae
Title Modeling and control of a novel semi-closed gas turbine-absorption combined cycle
book jacket
Descript 240 p
Note Source: Dissertation Abstracts International, Volume: 72-10, Section: B, page: 6332
Adviser: William E. Lear
Thesis (Ph.D.)--University of Florida, 2011
The Power, Water Extraction, and Refrigeration (PoWER) engine has been investigated for several years as a distribute energy (DE) system, among other applications, for civilian or military use. Previous literature describing its modeling and experimental demonstration have indicated several benefits, especially when the underlying semi-closed cycle gas turbine is combined with a vapor absorption refrigeration system (VARS), the PoWER system described herein. The benefits include increased efficiency, high part-power efficiency, small lapse rate, compactness, decreased emissions, reduced air and exhaust flows (which decrease filtration and duct size) and condensation of fresh water
In this research the preliminary design and modeling of a modified version of this system as applied to DE is the focus, a system especially useful in regions prone to major grid interruptions due to hurricanes, undercapacity, or terrorism. In such cases, the DE system should support most or all services within an isolated service island, including ice production, so that the influence of the power outage is limited in scope. This research also describes the rather straightforward system modifications necessary for ice production and the use of this ice-making capacity to achieve significant load-leveling during the summer utility peak, hence reducing the electrical capacity requirements for the grid Load-leveling strategies are also discussed
For this complex system, maximum efficiency and safe operation at any instant of time is the ultimate goal of an advanced control algorithm. To develop such advanced system controls, dynamic modeling is necessary. As part of this research, thermodynamic properties of ammonia-water mixtures and their behavior in a VARS are improved and applied to dynamic modeling of a VARS unit. A conventional moving boundary dynamic heat exchanger model is extended for two-component two-phase flow which exists in the VARS
School code: 0070
Host Item Dissertation Abstracts International 72-10B
Subject Engineering, Chemical
Engineering, Mechanical
Engineering, Environmental
Alt Author University of Florida
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