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η = Wt,1 +Wt,1 −Wp (10) Qin 3. Results and Discussion Fig. 2 shows the T-s diagram for reheat cycle at a high pressure Ph=12 MPa. Fig. 3 shows the effect of medium pressure Pm on the specific work output and thermal efficiency at a turbine inlet temperature of 90 oC. Especially, for the case of Pm=Ph, this indicates only 2nd turbine produces work and no reheat is reqired from vapor generator. Thus, the reheat cycle works as the baseline cycle with the same system performance. It can be seen that the specific work output and thermal efficiency become higher as increase of Pm, and exibit maximum values at different optimal Pm. In addition, the optimal Pm at maximum work output is lower than that at maximum efficiency. This can be explained that produced work from 1st turbine dercreases but from 2nd turbine increases as increase of Pm, thus maximum work output is about 17.77 kJ/kg at the optimal Pm=8.49 MPa. However, higher Pm reduces the reheat input, because the temperature after the 1st stage expansion is increased due to the lower expansion ratio and less amount of waste heat is required to reheat CO2. The required total heat input decreases still relatively faster than work output does, so maximum thermal efficiency occurrs at a slight higher Pm. 100 75 50 25 0 -1.75 -1.50 R744 -1.25 -1.00 Entropy [kJ/kg-K] -0.75 2 1 3 5.729 MPa 7 Cooling water 5 Waste heat 12 MPa 4 6 8.494 MPa Fig. 2. T-s diagram for the reheat cycle Fig. 3. Effect of Pm on reheat cycle performance 3.1 Effects of Ph on the optimal Pm and cycle performance Fig. 4. Optimal Pm for maximum Wnet Fig. 5. Optimal for Pm for maximum η Fig. 4 and 5 show effects of varied high pressures Ph on the cycle performance and optimal medium pressure Pm for maximum work output and thermal efficiency, respectively. As expected, optimal medium pressures Pm are higher as increase of high pressure Ph. Maximum work output Wnet rises dramatically when high pressure Ph increases from 9 MPa to about 12 MPa, and then a maximum Wnet about 18.3 kJ/kg is obtained at Ph=13.87 MPa and Pm=9.208 MPa. Thermal efficiency increases monotonically with Ph at the given range in this study. Efficiency reaches the maximum value of 0.08. For comparison of baseline and reheat cycles, the improvement of Wnet and η can be illustrated in Fig. 6 and Fig. 7, repectively. Larger enhancement by reheat for Wnet and η is achieved at higher Ph. This is because high-pressure isobari curve is steeper than at low pressure. For the case of Ph=15 MPa, Wnet and η are increased by approximately 50% and 15%, respectively. Additionally, it can be noticed that thermal efficiency improvement is relatively low compared to work output, because extra reheat input counteracts increased work output. 35 Temperature °CPDF Image | Parametric analysis of a reheat carbon dioxide transcritical power cycle using a low temperature heat source
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