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Energies 2020, 13, 2447 17 of 18 Symbols T1 temperature of CO2 at the inlet to the compressor (K) T2 temperature of CO2 at the recuperator cold side inlet (K) T2′ actual temperature of CO2 after compression (K) ′′ T2 temperature of CO2 at the recuperator cold side inlet (K) T3 temperature of CO2 at the recuperator cold side outlet (K) T4 CO2 turbine inlet temperature (K) T5 ideal CO2 temperature after expansion (K) T5′ actual CO2 temperature after expansion (K) ′′ T5 temperature of CO2 at the recuperator hot side inlet (K) T6 temperature of CO2 at the recuperator hot side outlet (K) W1-2 required compressor power (W) W4-5 the power on the turbine shaft (W) Wnet the net power of the system (W) Greek symbols ηc isentropic efficiency of the compressor (-) ηh efficiency of the heat exchange (-) ηp isentropic efficiency of the compressor (-) Abbreviations BC Brayton cycle CE cycle efficiency (%) LMTD logarithmic mean temperature difference of the recuperator (K) ORC organic Rankine’s cycle PWHT percent of waste heat transferred to CO2 (%) S-CO2 supercritical CO2 Bryton cycles WHUR waste heat utilization rate (%) References 1. Ríos-Mercado, R.Z.; Borraz-Sánchez, C. Optimization problems in natural gas transportation systems: A state-of-the-art review. Appl. Energy 2015, 147, 536–555. [CrossRef] 2. Kowalski, R.; Łaciak, M.; Liszka, K.; Oliinyk, A.; Paszylk, P. Application of ORC systems at natural gas compression station. AGH Drill. Oil Gas 2017, 34, 513–530. [CrossRef] 3. Kostowski, W.; Paja ̨czek, K.; Pociecha, A.; Kalina, J.; Niedzielski, P.; Przybył, A. Methods of waste heat recovery—A compressor station case study. Energy Convers. Manag. 2019, 197, 111837. [CrossRef] 4. Yilmazoglu, M.Z.; Amirabedin, E.; Shotorban, B. Waste heat utilization in natural gas pipeline compressor stations by an organic Rankine cycle. Energy Explor. Exploit. 2014, 32, 317–328. [CrossRef] 5. Bianchi, M.; Branchini, L.; De Pascale, A.; Melino, F.; Peretto, A.; Archetti, D.; Campana, F.; Ferrari, T.; Rossetti, N. Feasibility of ORC application in natural gas compressor stations. Energy 2019, 173, 1–15. [CrossRef] 6. Kim, M.S.; Ahn, Y.; Kim, B.; Jeong, J.I. Study on the supercritical CO2 power cycles for landfill gas firing gas turbine bottoming cycle. Energy 2016, 111, 893–909. [CrossRef] 7. Chen, Y. Novel Cycles Using Carbon Dioxide as Working Fluid. Licentiate Thesis, School of Industrial Engineering and Management, Stockholm, Sweden, 2006. 8. Kalina, A.I. Combined-cycle system with novel bottoming cycle. J. Eng. Gasturbines Power 1984, 106, 737–742. [CrossRef] 9. Chen, Y.; Lundqvist, P.; Johansson, A.; Platell, P. A comparative study of the carbon dioxide transcritical power cycle compared with an organic rankine cycle with R123 as working fluid in waste heat recovery. Appl. Eng. 2006, 26, 2142–2147. [CrossRef] 10. Ahn, Y.; Bae, S.J.; Kim, M.; Cho, S.K.; Baik, S.; Lee, J.I.; Cha, J.E. Review of supercritical CO2 power cycle technology and current status of research and development. Nucl. Eng. Technol. 2015, 47, 647–661. [CrossRef] 11. Yoon, H.J.; Ahn, Y.; Lee, J.I.; Addad, Y. Potential advantages of coupling supercritical CO2 Brayton cycle to water cooled small and medium size reactor. Nucl. Eng. Des. 2012, 245, 223–232. [CrossRef]PDF Image | Supercritical CO2-Brayton Cycle Nat Gas Compression Station
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