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performances and compares to baseline cycles without reheat. Thus, in this paper, a reheat transcritical carbon dioxide cycle is introduced and optimized. 2. System description and modeling Fig. 1(a) and (b) show schematics of a baseline cycle and a reheat cycle, respectively. In the reheat cycle, superheated vapor from the vapor generator (3) is expanded through 1st stage turbine to a medium pressure (Pm). Then, it is reheated again in the vapor generator and expanded through 2nd stage turbine to a low pressure (Pc), and finally the vapor is completely condensed to saturated liquid. A regenerator is not included since recent studies [9, 10] have shown that a regenerator only produces small improvement of thermal and exergetic efficiency but has little influence on the net power output. For the present study, the heat source is industrial waste water at a temperature of 100 oC. The cooling water is at 10 oC. The following general assumptions are formulated for this study without losing generosity: each component is considered as a steady-state steady-flow system; kinetic and potential energies as well as the heat and friction losses are neglected; pump and the turbine isentropic efficiencies are both set to be 0.8; saturated liquid is assumed at the condenser exit. (a) Baseline cycle (b) Reheat cycle Fig. 1. Schematic diagrams of supercritical CO2 power cycle The first law of thermodynamics is used for energy analysis. The thermal efficiency η and specific work output Wnet are final results for comparison. For the reheat cycle, the model and equations for the different components are the following: For the pump: For the two turbines: For the vapor generator: For the condenser: For the specific work output: h−h ηP = 2,s 1 h−h 21 W = m ( h − h ) Pc21 ηt,1 = h3 −h4 h3 −h4,s ηt,2 = h5 −h6 h5 −h6,s W t , 1 = m c ( h 3 − h 4 ) W t , 2 = m c ( h 5 − h 6 ) Q = m ⎡ ( h − h ) + ( h − h ) ⎤ in c⎣3 2 5 4⎦ Q =m (h−h) out c 6 1 Wnet =Wt,1+Wt,2−WP m c (1) ( 2 ) (3) (4) ( 5 ) ( 6 ) ( 7 ) (8) (9) For the thermal efficiency of the reheat cycle: 34PDF Image | Parametric analysis of a reheat carbon dioxide transcritical power cycle using a low temperature heat source
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