Abstract
Exergy Analysis is a viable tool to improve plant efficiency. This chapter focuses on performing exergy analysis of a thermal desalination plant (based on the MSF process) located in Yanbu, Saudi Arabia. Exergy flow rates are calculated and exergy destruction around each of the equipments is estimated. An exergy diagram is prepared to indicate equipment with the highest exergy destruction. The second law of efficiency of the plant is 3.22% and 2.84% at normal and peak loads, respectively. This efficiency is quite low and several measures can be done to improve it by decreasing the inlet exergy to the plant and controlling exergy losses during process operation. This is achieved by considering two variations in MSF designs, that is, once through (MSF-OT) and brine mixing (MSF-M). It is found that the design of MSF-M is a favorable option to minimize exergy loss.
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