Forward and Inverse Optimization of a Solar or Waste Heat Operated Modified Goswami Cycle

A modified Goswami cycle (MGC) is presented when it is operated in multigenerational mode through solar/waste heat input. For this, the conventional Goswami cycle (CGC) is transformed by adding supplementary refrigeration and heating assembly to its existing configuration. The arrangement of the refrigeration assembly is similar to that of the conventional absorption refrigeration cycle with an exception that the refrigerant vapor is generated from the hot liquid condensate of the CGC through flashing process. The heating facilities utilize the waste heat outputs of the refrigeration assembly for both preheating the basic solution and producing hot water. For the optimization of MGC, first different standalone energy (turbine power, sensible cooling output, latent cooling output and heating output) and exergy based objectives are formulated, which are solved by dragonfly algorithm. It is seen that there is no single standalone objective which generates maximum possible exergy efficiency of 27.39% and also have overall exergy destruction close to 88.97 kW (minimum possible value). So, these standalone objectives are clubbed to form two equally weighted forward and inverse objective functions, which are also minimized by dragonfly algorithm. The results show that the value of exergy efficiency for the forward (28.05%) and inverse (28.43%) based objectives are found to be higher than any of their standalone objective. Also, the overall exergy destruction for these forward (89.73 kW) and inverse (92.09 kW) based objectives are quite less than for the standalone case when exergy efficiency is 27.39
^%
(113.62 kW).