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ACCEPTED MANUSCRIPT = 1.0. In the case of subcritical LNG optimum efficiencies remain unchanged while the specific power parameter increases significantly (0.94 at 700 ◦C). 3 Simple CO2 cycles For basic theoretical reasons no saturated Rankine cycle can handle the large temperature span available when dealing with LNG which extends, for ex- ample, between a top temperature of 600 ◦C and a minimum temperature of -50 ◦C (τ = 3.9). A large portion of the cycle must be placed necessarily in the super–heated region. On the other hand a similar situation is encoun- tered also in usual steam cycles even if, in this case, the temperature ratio is of only 2.7. Making reference to the actual CO2 physical properties the simplest configuration for a power cycle extended to cryogenic temperatures turns out to be the one shown in Figure 3. The working fluid is condensed at -50 ◦C from point 5 to point 1, pressurized by pump to point 2, regenera- tively pre-heated to point 6, super-heated to point 3, expanded in a turbine to point 4 and regeneratively pre–cooled to point 5 in a counterflow heat exchanger. With reference to Figure 3.c even if the minimum temperature difference within the regenerator is small (for example 10 ◦C) the computed hot–end temperature difference is rather large (212 ◦C) owing the strong difference in the heat capacity of the high and of the low pressure fluid i.e. 12 peer-00573462, version 1 - 4 Mar 2011PDF Image | Class Action Information Notice Ormat Technologies
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