THE DEAD STATE CHOICE IN EXERGY CALCULATIONS FOR MARINE AND NAVAL APPLICATIONS

In this work the double choice for the dead state in exergy calculations is considered. Energy systems for marine and naval applications cover a wide range of possibilities and the exergetic analysis have proven to be a very useful tool at the previous design stages. Exergetic efficiency calculations of power generating systems allocated on board require a dead state definition as well as the knowledge of ambient conditions at any location defined by latitude and longitude. Temperature, pressure and relative humidity values at sea level all over the world have been estimated by using EdGMC software. Total exergy of ambient air and a methanol/water liquid mixture has been calculated at every latitude and longitude by using a unique dead state and a local dead state. The results obtained with both dead states are compared.