Abstract
The utilization of waste heat in a power plant syst em—which would otherwise be released back to the environment—in order to produce additional power increases the eff iciency of the system itself. The purpose of this s tudy is to present an energy and exergy analysis of Kalina Cycle System ( KCS) 11, which is proposed to be utilized to genera te additional electric power from the waste heat contained in geo thermal brine water available in the Lahendong Geot hermal power plant site in North Sulawesi, Indonesia. A modeling application on energy and exergy system is used to study the design of thermal system which uses KCS 11. To obtain the maximum power output and maximum efficiency, the system is optimized based on the mass fraction of working flu id (ammonia-water), as well as based on the turbine exhaust pressure. The result of the simulation is the optim um theoretical performance of KCS 11, which has the highest possible power output and efficiency. The energy flow diagra m and exergy diagram (Grassman diagram) was also presented for KCS 11 optimum system to give quantitative information regarding energy flow from the heat source to s ystem components and the proportion of the exergy input d issipated in the various system components.
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