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condensers would occupy an area of 42 x 40 feet. BNI does feel the condensing temperature of 102°F is too low for an 80°F ambient temperature. Raising the condensing temperature from 102°F to 115°F is projected to lower air-cooled condenser area, parasitic power (from 125hp to 75hp). The cost would also be lower. A cost estimate summary is presented in Table 1. This Table contains only the major components and prices listed are unburdened. Also site preparation, foundation, structures, motor controls, piping, electrical switchgear, electrical or mechanical assembly, and general system integration costs are not shown. Closing Remarks After reviewing the “design-point” cycle and its cost, BNI suggest the following modifications. 1) Increase recuperator effectiveness to 85%, 2) Raise the condensing temperature to at least 115°F. and 3) Lower turbine design speed to 13,500rpm (this will lower turbine efficiency from 0.77 to 0.75, but single-stage gearbox efficiency is 0.99 – up from 0.98 for two-stage gearbox). The cycle that results from these changes is one of greater efficiency and lower cost (20.0% vs 19.0% efficiency with BNI estimated condenser parasitic power included). BNI cycle-simulation printouts for both the “design-point” cycle and the modified cycle are includes with this report. BNI feels that the n-pentane Rankine cycle (with the above mentioned changes) to be a reasonable cycle of good efficiency. The major reservation that remains is the thermal stability of the n-pentane at the high turbine inlet temperature. BNI’s task was to comment on the Rankine cycle portion of the entire system. BNI does not know enough about the intended use for this solar-heated power generating system to judge the overall practicality of the total system. C-5PDF Image | Modular Trough Power Plant Cycle and Systems Analysis
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