Please use this identifier to cite or link to this item: http://localhost:8081/xmlui/handle/123456789/10538
Title: THERMOECONOMIC OPTIMIZATION OF A TRIGENERATION SYSTEM USING EXERGY SPLITTING METHOD
Authors: Beyene, Wolduamlak
Keywords: MECHANICAL INDUSTRIAL ENGINEERING;THERMOECONOMIC OPTIMIZATION;TRIGENERATION SYSTEM;ENERGY SPLITTING METHOD
Issue Date: 2010
Abstract: In this work the method of exergy splitting has been used for exergoeconomic analysis of a trigeneration system (combined power, heat and refrigeration) with different capacity and combination. In the conventional thermoeconomic analysis approach it is seen that the less exergetic streams having more unit cost than do the more exergetic ones. The exergy splitting method used here, on the other hand, helps to assign unit costs of the streams according to their quality and finds the cost of the products close to the actual energy market value. The thermomechanical flow exergy is written as the sum of two components (thermobaric and thermoambient components) with different actual qualities. A different unit cost consistent with the actual market value of energy is then assigned to each of these two components. The higher quality component can be assigned the same unit cost as work whereas the lower quality component will usually be assigned a lower unit cost. Therefore, the cost rates of a system's input or output streams will be closer to actual economic values. The trigeneration system is presented in two parts for analysis purpose; a cogeneration plant and vapor absorption refrigeration unit. The purpose of the cogeneration plant is to generate a net electric power of 50.0 MW and to provide 15.0 kg/s of saturated steam at 2.5 bar for process heat. Two more combinations (100 MW and 10 kg/s) and (150 MW and 25 kg /s) are used for optimization to check applicability of the system. Decision variables [rp,T3,7lac,rlgt'1lst' Tip, Pio1 are optimized using Evolutionary programming. Values of these variables will help to select components of the plant, i.e. turbines, compressor, as close to the optimum configuration. A vapor absorption refrigeration system (based on water/ LiBr pair) for air conditioning purpose is designed using the waste heat (flue gas) from the cogeneration plant. This makes the system more economical compared to systems where power, heat and cooling are obtained individually, and lowers the CO2 and other emissions.
URI: http://hdl.handle.net/123456789/10538
Other Identifiers: M.Tech
Research Supervisor/ Guide: Singh, K. M.
Sahoo, P. K.
metadata.dc.type: M.Tech Dessertation
Appears in Collections:MASTERS' DISSERTATIONS (MIED)

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