Exergy Analysis of a Novel Combined System Consisting of a Gas Turbine, an Organic Rankine Cycle and an Absorption Chiller to Produce Power, Heat and Cold

Document Type : Original Article

Authors

Department of Engineering, Urmia University, Urmia, Iran

Abstract

The current work investigates the exergy analysis of a new system to generate power, heat, and refrigeration. In the proposed system, the heat loss of a gas turbine (GT) is first recovered by a Heat Recovery Steam Generator (HRSD), then by an Organic Rankine Cycle (ORC) to generate warm water and additional power, respectively. In the ORC, reheating is used to increase the output power, the required heat of which is provided by a geothermal resource. Moreover, there is an absorption refrigeration cycle in the system that operates with the remaining geothermal heat. The exergy efficiency of the system were 50.65%; while the coefficient of performance of the refrigeration system was calculated to be 0.5. In this regard in the entire system, the combustion chamber accounted for the major exergy destruction, making the GT/HRSG system have the highest portion of 87.71%. The greatest exergy efficiency was 96%, which was obtained for the gas turbine.

Keywords


1. Shakib, S. E., Amidpour, M., Esmaieli, A., Boghrati, M. and
Ghafurian, M. M., “Various Approaches to Thermodynamic
Optimization of a Hybrid Multi-effect Evaporation with Thermal
Vapour Compression and Reverse Osmosis Desalination System
Integrated to a Gas Turbine Power Plant”, International Journal
of Engineering, Transactions B: Applications, Vol. 32, No. 5,
(2019) 777-789 
2. Khaljani, M., Saray, R.K. and Bahlouli, K., “Comprehensive
analysis of energy, exergy and exergo-economic of cogeneration  
of heat and power in a combined gas turbine and organic Rankine
cycle”, Energy Conversion and Management, 97 (2015) 15465.
3. Chacartegui, R., Sánchez, D., Muñoz, J. and Sánchez, T,
“Alternative ORC bottoming cycles for combined cycle power
plants”, Applied Energy, Vol. 86, (2009) 2162-2170. 
4. Nemati, A., Nami, H., Ranjbar, F. and Yari, M. A, “comparative
thermodynamic analysis of ORC and Kalina cycles for waste heat
recovery: A case study for CGAM cogeneration system”, Case
Studies in Thermal Engineering, Vol. 9, (2017), 1-13,
https://doi.org/10.1016/j.csite.2016.11.003. 
5. Kumar Singh, R., Sharma, R. V., “Mathematical Investigation of
Soil Temperature Variation for Geothermal Applications”,
International Journal of Engineering,. Vol. 30, No. 10, (2017),
1609-1614. 
6. Abdolalipouradl, M., Khalilarya, Sh., and Jafarmadar, S.,
“Energy and Exergy Analysis of a New Power, Heating, Oxygen
and Hydrogen Cogeneration Cycle Based on the Sabalan
Geothermal Wells”, International Journal of Engineering, 
Transactions A: Basics, Vol. 32, No. 3, (2019), 445-450.
7. Kianfard, Khalilarya, H. S., Jafarmadar, S,. “Exergy and 
exergoeconomic evaluation of hydrogen and distilled water
production via combination of PEM electrolyzer, RO desalination
unit and geothermal driven dual fluid ORC”, Energy Conversion
and Management, Vol. 177 (2018), 339-49. 
8. Behzadi, A., Gholamian, E., Ahmadi, P., Habibollahzade and A.,
Ashjaee, M.. “Energy, exergy and exergoeconomic (3E) analyses
and multi-objective optimization of a solar and geothermal based
integrated energy system”, Applied Thermal Engineering, Vol.
143, (2018), 1011–1022 
9. Bejan, A., Tsatsaronis, G., Moran, M., “Thermal design and
optimization”, John Wiley & Sons, 1996. 
10. Li, G., “Organic Rankine cycle performance evaluation and
thermoeconomic assessment with various applications part I:
Energy and exergy performance evaluation”, Renewable and
Sustainable Energy Reviews, Vol. 53, (2016), 477-99. 
11. Mohammadi, A., Kasaeian, A., Pourfayaz, F. and Ahmadi, M. H.,
“Thermodynamic analysis of a combined gas turbine, ORC cycle
and absorption refrigeration for a CCHP system”, Applied
Thermal Engineering, Vol. 111, (2017), 397-406. 
12. Yari, M., Mahmoudi, S., “A thermodynamic study of waste heat
recovery from GT-MHR using organic Rankine cycles”, Heat
and Mass Transfer, Vol. 47, (2011), 181-196.