Exergy Analysis of Waste Heat Recovery in the LNG-Based Combined Cooling and Power (CCP) System and Its Use in GAX Cycles
Peyman Asemani Kalejahi
Abstract
An LNG-based combined cooling and power (CCP) system and the energy recovery from the waste heat were proposed to be used in a GAX cycle and cooling generation. Modeling the cycle was carried out in EES Software. In order to ensure the precision of the obtained results of the simulation, the LNG-based power generation system and the GAX cycle, was validated by comparing them with the results of the technical literature. The intended combined cycle was reviewed from the first and second laws of thermodynamics` perspective. Furthermore, the capacity of the refrigeration cycle, net generated power of the cycle, energy efficiency, exergy efficiency, and total exergy destruction, as well as the exergy destruction of each component of the cycle have been evaluated. The exergy analysis results showed the great amount of exergy destructs in the combustion chamber and heat exchanger number two, respectively. Also, it was concluded that the use of the GAX refrigeration cycle and energy recovery from the waste heat of the mentioned cycle have been very effective to enhance the overall efficiency of the cycle.
