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Title Evaluation of performance of combined heat and power systems with dual power generation units (D-CHP)
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Publication Date
Degree PhD
Discipline/Department Mechanical Engineering
Degree Level doctoral
University/Publisher Mississippi State University
Abstract In this research, a new combined heat and power (CHP) system configuration has been proposed that uses two power generation units (PGU) operating simultaneously with different operational strategies (D-CHP). The performance of the proposed D-CHP system configuration, with one PGU operated at a constant base load and the other operated following the electric load, is quantified in terms of operational cost savings, primary energy consumption (PEC) savings, and carbon dioxide emissions (CDE) savings over a reference case employing a conventional, separate heat and power system. D-CHP system performance is also compared to standard, single PGU operational strategies. The D-CHP system configuration is first examined for four different building configurations simulated using the weather of Chicago, IL. Then, the D-CHP system feasibility study is extended to examine a full-service restaurant benchmark building in nine different U.S. climate zones. Next, the D-CHP configuration is simulated under a second operational strategy, in which one PGU operates base-loaded while the other follows the thermal load, and the two D-CHP strategies are compared. Additionally, the effect of thermal storage on D-CHP system performance is examined. Finally, the D-CHP configuration is extended to a combined cooling, heating, and power configuration (D-CCHP), and the feasibility of this configuration is examined. In addition to D-CHP and D-CCHP systems performance analyses, the parameters of power-to-heat ratio; cost, emissions and primary energy consumption spark spreads; cost and emission ratios; and thermal difference are proposed and examined as performance indicators. It was determined that D-CHP and D-CCHP system strategies can be a viable alternative to traditional CHP system or combined cooling, heating, and power (CCHP) system operational strategies, in terms of operational cost, PEC, and CDE performance. Generally, the D-CHP and D-CCHP configurations are found to perform comparably to or better than traditional CHP and CCHP configurations.
Subjects/Keywords cogeneration; combined heat and power; CHP; CCHP
Contributors Pedro J. Mago (chair); Rogelio Luck (committee_member); Richard Forbes (committee_member); Heejin Cho (committee_member)
Language en
Rights unrestricted
Country of Publication us
Format application/pdf
Record ID oai:library.msstate.edu:etd-07222013-130853
Repository msstate
Date Retrieved
Date Indexed 2018-01-03
Grantor MSSTATE

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…METHODOLOGY ..................................11 D-CHP System Configuration and Modeling Equations .................................11 Additional Parameters Used in D-CHP System Models..................................19 D-CCHP System Configuration and…

…60 VI. PERFORMANCE OF D-CCHP CONFIGURATION ....................................61 Introduction ......................................................................................................61 D-CCHP System Performance and Spark Spreads…

…62 D-CCHP System Performance Compared to D-CHP System .........................68 D-CCHP System and Potential Operating Cost Savings with Carbon Credits…

…location [48].....................................................63 14 D-CCHP system efficiency values .....................................................................63 15 Cost, PEC, and CDE factors and spark spreads…

…64 16 Selected PGU sizes for D-CCHP configuration .................................................64 17 Selected PGU sizes for D-CHP configuration ...................................................70 vi LIST OF FIGURES 1 Schematic of…

…13 3 Schematic of proposed D-CHP system with TS ................................................14 4 Schematic of D-CCHP system configuration.....................................................21 5 Operational cost savings for different PGU1…

…Performance of D-CCHP system over the reference case in terms of operating cost savings ............................................................................65 25 Performance of D-CCHP system over the reference case in terms of PEC savings…

…66 26 Performance of D-CCHP system over the reference case in terms of CDE savings ...........................................................................................66 27 Operational cost savings of D-CCHP system relative to D-CHP system…

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