Abstract
A combined heat and power (CHP) system generates electricity from thermal energy and generates heat by utilizing the remaining thermal energy. The system efficiency of the cogeneration system is 75–85 %, which is very high compared to existing only power generation facilities, so it is very useful for energy conservation and environmental protection. For this reason, interest in the cogeneration system is increasing worldwide. Generally, a cogeneration plant consists of a steam turbine alone or the combined power generation of a gas turbine and a steam turbine depending on the scale. The steam turbine is divided into a back-pressure type turbine and a condensing type turbine depending on the operational methodology of the steam turbine. In both cases, the shift in the return temperature of the district heating users influences the performance of the cogeneration plant, thus affecting the power generation costs of the power plant. It is possible to accurately estimate the change in the unit cost of the power generation caused by these changes, and to inflict it on the user, thereby changing the usage pattern of the user and reducing the energy consumption accordingly. In this study, the commercial combined cycle cogeneration system using back - pressure type turbine was simulated, and the change of performance of the combined heat and power plant was analyzed while changing the user facility’s total return temperature. Based on the results of this analysis, a possible loss in the plant according to the change of return temperature was predicted. Also the effect of each user’s return temperature on the plant loss was analyzed using an actual user’s return temperature data. The economic-mechanical approach, such as this study, can alleviate dissatisfaction with the user’s charge and to consume energy in a more rational way. It eventually can play a role in reducing carbon emissions.
Similar content being viewed by others
Abbreviations
- c:
-
Specific heat
- η :
-
Efficiency
- ṁ :
-
Small mass flow
- M :
-
Large mass flow
- Q :
-
Heat
- U :
-
Heat transfer coefficient
- V :
-
Viscosity
- Ẇ :
-
Power
References
J. Y. Yan, Handbook of Clean Energy System - Volume VI, John Wiley & Sons Ltd., Chichester, U.K (2015) 1185–1196.
H. J. Choi. D. S. Amanda and M. Pedro, Combined cooling, heating and power: A review of performance improvement and optimization, Applied Energy, 136 (2014) 168–185.
K. Darrow, R. Tidball, J. Wang and A. Hampson, Catalog of CHP Technologies, U.S. Environmental Protection Agency CHP Partnership (2014).
J. Conti; P. Holtberg, S. Napolitano, M. Schaal and E. Linda, International Energy Outlook 2014, U.S. Energy Information Administration (2014).
U.S. Department of Energy, A Decade of Progress Combined Heat and Power, U.S. Department of Energy (2009).
S. Werner, International review of district heating and cooling, Energy, 137 (2017) 617–631.
L. Giaccone and A. Canova, Economical comparison of CHP systems for industrial user with large steam demand, Applied Energy, 86 (2009) 904–914.
W. Graus and E. Worrell, Methods for calculating CO2 intensity of power generation and consumption A global perspective, Energy Policy, 39 (2011) 613–627.
L. Olsson, E. Wetterlund and M. Soderstrom, Assessing the climate impact of district heating systems with combined heat and power production and industrial excess heat, Resources, Conservation and Recycling, 96 (2015) 31–39.
H. Li, F. Marechal and D. Favrat, Power and cogeneration technology environomic performance typification in the context of CO2 abatement part II. Combined heat and power cogeneration, Energy, 35 (2010) 3517–3523.
R. E. Klaassen and M. K. Patel, District heating in the Netherlands today: A techno-economic assessment for NGCC-CHP, Energy, 54 (2013) 63–73.
A. Marbe, S. Harvey and T. Berntsson, Technical, environmental and economic analysis of co-firing of gasified biofuel in a natural gas combined cycle (NGCC) combined heat and power (CHP) plant, Energy, 31 (2006) 1614–1631.
H. Wang, W. Yin, E. Abdollahi, R. Lahdelma and W. Jiao, Modelling and optimization of CHP based district heating system with renewable energy production and energy storage, Applied Energy, 159 (2015) 401–421.
S. Sandra, D. C. Ines, E. Javier and G. S. Javier, Modeling and multi-objective optimization of a complex CHP process, Applied Energy, 161 (2016) 309–319.
S. C. Roger, Return temperature influence of a district heating network on the CHP plant production costs, M.S. Dissertation, University of Gavle, Sweden (2009).
F. Lin, J. Yi, Y. Weixing and Q. Xuzhong, Influence of supply and return water temperatures on the energy consumption of a district cooling system, Applied Thermal Engineering, 21 (2001) 511–521.
O. Brandweiner, Lower return temperatures within district heating systems - A comparison of Danish and German district heating systems, M.S. Dissertation, University of Aalborg, Denmark (2009).
T. Herena and S. Dietrich, Development of system concepts for improving the performance of a waste heat district heating network with exergy analysis, Energy and Buildings, 42 (2010) 1601–1609.
S. Y. Im, J. J. Lee, Y. S. Jeon and H. T. Kim, Performance analysis on CHP plant using back pressure turbine according to return temperature variation, The KSFM J. of Fluid Machinery, 19 (6) (2016) 26–33.
H. Esen, M. Inalli and M. Esen, Technoeconomic appraisal of a ground source heat pump system for a heating season in eastern Turkey, Energy Conversion and Management, 47 (2006) 1281–1297.
H. Esen, M. Inalli and M. Esen, A techno-economic comparison of ground-coupled and air-coupled heat pump system for space cooling, Building and Environment, 42 (2007) 1955–1965.
M. Esen and T. Yuksel, Experimental evaluation of using various renewable energy sources for heating a greenhouse, Energy and Buildings, 65 (2013) 340–351.
GE Energy, GateCycleTM, Ver. 6.1.0, GE Energy (2010).
GE Power System, GE Gas Turbine Performance Characteristics, GE Power System, NY, USA (2000).
S. Aurel, Steam and Gas Turbines, McGraw-Hill, New York (1927).
D. H. Cooke, On prediction of off-design multistage turbine pressures by Stodola’s ellipse, J. of Eng. Gas Turbines Power, 107 (1985) 596–606.
R. C. Spencer, K. C. Cotton and C. N. Cannon, A method for predicting the performance of steam turbine-generators: 16,500 kWand larger, J. of Engineering for Power, 85 (1963) 249–298.
M. R. Erbes, Phased construction of integrated coal gasification combined cycle power plants, Ph.D. Thesis, Stanford University, U.S.A. (1986).
J. N. Phillips, A study of the off-design performance of integrated coal gasification combined cycle power plants, Ph.D. Thesis, Stanford University, USA (1986).
F. C. Knopf, Modeling, Analysis and Optimization of Process and Energy Systems, John Wley & Sons, Hoboken, New Jersey (2011).
R. K. Mobley, Plant Engineer’s Handbook, Butterworth Heinemann, Boston, USA (2001).
GE Energy, MS7001EA(PG7121) Gas Turbine Generator Thermal Performance Test Procedure Lotte, Ver.7.08, Pangyo, Korea, GE Energy (2010).
Lotte Eng. & Construction Co. Ltd., Pangyo Combined Heat & Power Plant Heat & Mass Balance Diagram Rev.03, Korea, Lotte Eng. & Construction Co. Ltd. (2010).
A. Ganjehkaviri, M. M. Jaafar and S. E. Hosseini, Optimization and the effect of steam turbine outlet quality on the output power of a combined cycle power plant, Energy Conversion and Management, 89 (2015) 231–243.
A. C. Robin, Thermal Power Plant Volume III, Eoloss Publishers, Oxford, UK (2009).
Acknowledgments
This work was supported by the Energy Demand side Management Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea (No.20172010000190).
Author information
Authors and Affiliations
Corresponding author
Additional information
Recommended by Editor Yong Tae Kang
Jongjun Lee is a Principal Researcher of Frontier Research and Training Institute on Korea District Heating Corporation, Gyeonggi, Republic of Korea. He received his Ph.D. in Mechanical Engineering from Inha University. His research interests include cogeneration system, distributed generation, combined cycle performance and performance monitoring.
Kyoung Min Kim is a Principal Researcher of Frontier Research and Training Institute on Korea District Heating Corporation, Gyeonggi, Republic of Korea. His Ph.D. in Mechanical Engineering is from Yonsei University. His research interests include combined heat and power system, district heating and cooling system.
Shinyoung Im is a Department Manager of Global Business Department on Korea District Heating Corporation, Gyeonggi, Republic of Korea. His Ph.D. in Energy Engineering is from Ajou University. His research interests include district heating and cooling system, distributed generation, user’s facilities of district heating and CHP performance.
Won Seok Jang is a Head Researcher of Korea District Heating Corporation Frontier Research and Training Institute, Gyeonggi, Republic of Korea. His Ph.D. in Environmental Engineering is from Inha University. His research interests include CCUS, water treatment-plant technologies, and renewable energy sources such as biogas and SRF.
Mun Sei Oh is a Department Manager of Korea District Heating Corporation Frontier Research and Training Institute, Gyeonggi, Republic of Korea. He received his M.S. in Mechanical Engineering from Chungnam National University. His research interests include regeneration system, distributed generation, zero energy building, smart farm and CCUS technologies.
Sang Ho Shin is a Team Manager of Plant Division on Korea District Heating Corporation, Gyeonggi, Republic of Korea. He received his M.S. in Mechanical Engineering from Inha University. His research interests include OTEC (Ocean Thermal Energy Conversion), water footprint of CHP, cogeneration system and gas turbine cycle innovation.
Rights and permissions
About this article
Cite this article
Lee, J., Kim, K.M., Im, S. et al. A study on the variation of the performance and the cost of power generation in a combined heat and power plant with the change of the user facility’s return temperature. J Mech Sci Technol 34, 905–915 (2020). https://doi.org/10.1007/s12206-020-0140-5
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12206-020-0140-5