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4. Conclusions In this paper, a reheat transcritical CO2 power cycle has been investigated and compared to a non-reheat baseline cycle with respect to net power output, thermal efficiency and exergy efficiency. It is found that medium pressure before 2nd stage expansion is an important parameter to determine reheat cycle performance. For the given cycle high pressure and turbine inlet temperature, two different optimal medium pressures exist corresponding to maximum work output and thermal efficiency, respectively. The optimal pressure for maximum work output is higher than that for maximum thermal efficiency under the same conditions. Compared to baseline cycle, larger improvements of work output and thermal efficiency by reheat cycle are obtained at a lower turbine inlet temperature and/or larger high cycle pressure. The maximum improvements for work and thermal efficiency are approximately 90% and 30%, respectively. The overall results show that work output is increased by reheat more significantly than thermal efficiency. This indicates it is proper to use the reheat cycle under which condition maximizing work output is most concerned. In summary, the reheat with two stage expansion has great potential to improve work output and thermal efficiency of a CO2 transcritical power cycle using a low-grade heat source. Nomenclature h enthalpy (kJ/kg) Subscripts P pressure (MPa) Q heat input (kW) T temperature (oC) W power (kW) Greek letters ε improvement factor η thermal efficiency ηp Pump isentropic efficiency ηt Turbine isentropic efficiency 5. References b baseline cycle C condenser h high pressure m medium pressure net net work output p pump r reheat cycle t turbine VG vapor generator [1] Chen Y, Lundqvist P, Johansson A, Platell P. A comparative study of carbon dioxide transcritical power cycle compared with an organic rankine cycle with R123 as working fluid in waste heat recovery. Appl Therm Eng 2006;26:2142-7. [2] Zhang XR, Yamaguchi H, Uneno D. Thermodynamic analysis of the CO2-based rankine cycle powered by solar energy. Int J Energy Res 2007;31:1414-24. [3] Zhang XR, Yamaguchi H, Fujima K, Enomota M, Sawada N. Study of solar energy powered transcritical cycle using supercritical carbon dioxide. Int J Energy Res 2006; 30: 1117-29. [4] Cayer E, Galanis N, Nesreddine H. Parametric study and optimization of a transcritical power cycle using a low temperature source. Appl Energy 2010;87:1349-57. [5] Baik YJ, Kim M, Chang KC, Kim SJ. Powered-based performance comparison between carbon dioxide and R125 transcritical cycles for a low-grade heat source. Appl Energy 2011;88:892-8. [6] Wang J, Sun Z, Dai Y, Ma S. Parametric optimization design for supercritical CO2 power cycle using genetic algorithm and artificial neural network. Appl Energy 2009;87:1317-24. [7] Chen H, Goswami DY, Stefanakos EK. A review of thermodynamic cycles and working fluids for the conversion of low-grade heat. Renew Sust Energ Rev 2010;14:3059-67. [8] Dostal V. A supercritical carbon dioxide cycle for next generation nuclear reactors. Doctoral thesis, Department of Nuclear Engineering, MIT, 2004. [9] Cayer E, Galanis N, Desilets M, Nesreddine H, Roy P. Analysis of a carbon dioxide transcritical power cycle using a low temperature source. Appl Energy 2009;86:1055-63. [10] Starling KE, Fish LW, Iqbal KZ, Yieh D. Resource utilization efficiency improvement of geothermal binary cycles, phase 1. Semiannual progress report; 1975. 37PDF Image | Parametric analysis of a reheat carbon dioxide transcritical power cycle using a low temperature heat source
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