Thermodynamic Analysis of an Integrated System for LNG Regasification and Power Production


  • Easwaran Nampoothiry K
  • Rijo Jacob Thomas


LNG, Regasification, Exergy, Rankine cycle, Power generation


Today, natural gas is used in domestic as well as for various industrial purposes. Natural gas being found in remote and specific locations, it has to be transported for long distance before supplied to customers around the globe. Producing liquefied natural gas (LNG) is a highly energy intensive process and consumes about 10 – 15% of total energy spent for LNG production.  However, eventually for the end use, natural gas need to be supplied in its gaseous form and the process is known as regasification.  Energy spent for the liquefaction of natural gas is wasted unless it is recovered during this regasification process. Cold exergy of LNG can be utilized for improving the performance of Rankine cycle based power plants. This paper has proposed a power system in which low temperature waste heat can be effectively recovered and LNG can be vaporized to atmospheric conditions. The system consists of propane Rankine cycle and LNG power generation system using direct expansion. It is modeled by considering mass and energy balance in each component. The result shows that proposed cycle has good in performance and gives an exergy efficiency of 37.25 %. The effect of key parameters on system performance was also investigated.


Saeid Mokhatab, John Y. Mak, Jaleel V.Valappil, “Handbook of Liquefied Natural Gasâ€, Gulf professional publications, 2014

Rijo Jacob Thomas, Parthasarathi Ghosh, Kanchan Chowdhury,†Exergy analysis of helium liquefaction systems based on modiï¬ed Claude cycle with two-expandersâ€, Cryogenics 51 (2011) 287–294

Yongliang Li, Haisheng Chen, Yulong Ding, “Fundamentals and applications of cryogen as a thermal energy carrier: A critical assessmentâ€, International Journal of Thermal Sciences 49 (2010) 941-949

Huan Wang , Xiaojun Shi , Defu Che, “Thermodynamic optimization of the operating parameters for a combined power cycle utilizing low-temperature waste heat and LNG cold energyâ€, Applied Thermal Engineering 59 (2013) 490- 497

“ASHRAE STANDARD Designation and Safety Classification of Refrigerantsâ€, ANSI/ASHRAE Standard 34-2011

The exergy method for thermal plant analysis, TJ Kottas, University of London, (1995)

Celidonio Dispenza, Giorgio Dispenza, “Exergy recovery during LNG regasiï¬cation: Electric energy production – Part oneâ€, Applied Thermal Engineering 29 (2009) 380–387

Mohammed A. Khatita, Tamer S,†Power generation using waste heat recovery by organic Rankine cycle in oil and gas sector in Egypt: A case studyâ€, Energy 64 (2014) 462-472

Kyoung Hoon Kim, Jae Hyeong Oh, and Hyung Jong Ko, “Performance Analysis of Ammonia-Water Power Generation Cycle Utilizing LNG Cold Energyâ€, Journal of Automation and Control Engineering Vol. 3, No. 1, February (2015)

Yogi Goswami, Huijuan, “A review of thermodynamic cycles and working fluids for conversion of low grade heatâ€, Renewable and sustainable Energy reviews 14 (2010)

M. Chys, Broek, “Potential of zeotropic mixtures as working fluids in organic Rankine cycleâ€, Energy 44 (2012)

Nicolas and Fabrice, “validation CATHARE code against experimental data from Brayton cycle power generation systems†Nuclear engineering and design 238 (2008)

Satish Kumar, Hyouk-Tae Kwon, “LNG: An eco-friendly cryogenic fuel for sustainable developmentâ€, Applied Energy 88 (2011) 4264–4273

Ung Lee, Chonghun Han, “Design and optimization of multicomponent organic Rankine cycle using Liquefied natural gas cryogenic exergyâ€, Energy 77 (2014), 520-532

Randall F. Barron, “Cryogenic systems, Second edition 1985â€, Oxford University


How to Cite

K, E. N., & Thomas, R. J. (2015). Thermodynamic Analysis of an Integrated System for LNG Regasification and Power Production. Asian Journal of Engineering and Technology, 3(4). Retrieved from