The knowledge of off-design performance for a given gas turbine system is critical particularly in applications where considerable operation at low load setting is required. This information allows designers to ensure safe operation of the system and determine in advance thermoeconomic penalty due to performance loss while operating under part-load conditions. In this paper, thermoeconomic analysis results for the intercooled reheat (ICRH) and recuperated gas turbine, at the part-load conditions in cogeneration applications, have been presented. Thermodynamically, a recuperated ICRH gas turbine-based cogeneration system showed lower penalty in terms of electric efficiency and Energy Saving Index over the entire part-load range in comparison to the other cycles (nonrecuperated ICRH, recuperated Brayton and simple Brayton cycles) investigated. Based on the comprehensive economic analysis for the assumed values of economic parameters, this study shows that a midsize (electric power capacity 20 MW) cogeneration system utilizing nonrecuperated ICRH cycle provides higher return on investment both at full-load and part-load conditions, compared to the other same size cycles, over the entire range of fuel cost, electric sale, and steam sale values examined. The plausible reasons for the observed trends in thermodynamic and economic performance parameters for four cycles and three sizes of cogeneration systems under full-load and part-load conditions have been presented in this paper.

Saidi, A., Sunden, B., and Eriksson, D., 2000, “Intercoolers in Gas Turbine Systems and Combi-Processes for Production of Electricity,” ASME Paper No. 2000-GT-0234.
McDonald, C. F., 2000, “Low Cost Recuperator Concept for Microturbine Applications,” ASME Paper No. 2000-GT-167.
Bhargava, R., Bianchi, M., Negri di Montenegro, G., and Peretto, A., 2000, “Thermo-economic Analysis of an Intercooled, Reheat and Recuperated Gas Turbine for Cogeneration Applications: Part 1—Base Load Operation,” ASME Paper No. 2000-GT-0316.
Cohen, H., Rogers, G. F. C., and Saravanamuttoo, H. I. H., 1987, “Gas Turbine Theory,” 3rd Ed., Longman Singapore Publishers (Pte) Ltd., Singapore, pp. 292–293.
Kays, W., and London, L., 1964, Compact Heat Exchangers, 2nd Ed., McGraw-Hill, New York.
Rohsenow, W. M., Hartnett, J. P., and Ganic, E. N., 1985, Handbook of Heat Transfer Applications, 2nd Ed., McGraw-Hill, New York.
Benvenuti, E., Bettocchi, R., Cantore, G., Negri di Montenegro, G., and Spina, P. R., 1993, “Gas Turbine Cycle Modeling Oriented to Component Performance Evaluation from Limited Design or Test Data,” ASME–Cogen Turbo, Bournemouth, UK, Sept. 21–23.
Bhargava, R., and Peretto, A., 2001, “A Unique Approach for Thermo-economic Optimization of an Intercooled, Reheat and Recuperated Gas Turbine for Cogeneration Applications,” ASME Paper No. 2001-GT-0206.
You do not currently have access to this content.