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ACCEPTED MANUSCRIPT of the supercritical CO2 (average heat capacity of 2.64 kJ/kg K) and of the low pressure gas after the turbine expansion (average heat capacity of 0.96 kJ/kg K). This substantially irreversible heat transfer represents the main efficiency limit of the simple CO2 conversion cycle. Assuming the components characteristics reported in Table 2 (which are consistent with those stipulated for the steam and for the Brayton cycles), Figure 4 reports the overall cycle efficiency as a function of turbine inlet pressure, turbine inlet temperature and of condensation temperature. Using once more the AspenPlus computation program, at tmax = 600 ◦C, pmax = 150 bar, tcond = -50 ◦C efficiency turns out to be 46.3 % which compares with a 46.5 % efficiency of the nitrogen cycle (50 % against 50.7 % for nitrogen at 700 ◦C). In the case of CO2, however all the compression is performed by a pump and the total power involved in both compression and expansion is only slightly larger than the plant net output (1.12 power ratio against 2.22 for Brayton cycle). As it happens in all condensing cycles a compromize must be found be- tween cycle efficiency (which request the minimum achievable condensation temperature) and the LNG exergy utilization which requires a high LNG final temperature which can only be obtained with a high condensation tem- perature and a reduced cycle efficiency. Owing to these conflicting requirements the specific power output SPP 13 peer-00573462, version 1 - 4 Mar 2011PDF Image | Class Action Information Notice Ormat Technologies
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