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The study demonstrated the optimal operation criteria of a gas turbine cogeneration system based on the analytical solution of a linear programming model. The optimal operation criteria gave the combination of equipment to supply electricity and steam with the minimum energy cost using the energy prices and the performance of equipment. By the comparison with a detailed optimization result of an existing cogeneration plant, it was shown that the optimal operation criteria successfully provided a direction for the system operation under the condition where the electric power output of the gas turbine was less than the capacity.

Semiconductor production lines are run all the year round and the electrical load is large. Thus their airconditioning load and operating hours are on the rise. Consequently, the operational cost accounts for a significant proportion of their production cost. Facilities that feed chilled water to cleanrooms are run for many hours, with a high loading factor, such that both their energy requirements and CO2 emissions can be cut drastically by redesigning the existing plant. This report introduces a package of energy-saving concepts that have been successfully implemented in the refrigerating plant for a cleanroom dedicated to manufacturing semiconductors to promise reduction in both the life-cycle cost (LCC) and life-cycle CO2 (LCCO2). We have found that new energysaving facilities and maintenance routines and frequencies could be optimized to reduce the LCC by 172 million yen and LCCO2 emissions by 14,050t-C02 over a 10-year period.

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