Abstract:
This paper introduces a new combined power and cooling cycle (CPCC) formed by the integration of a modified
Kalina and Goswami cycles sharing a common absorber that in turn demands for internal rectification in the
former cycle. Unlike most of the conventional studies which are aimed at minimizing the overall exergy
destruction of the cycle (E˙ Dx,OC), this work clarifies that such a practice does not ensure the optimized attainment
of total turbine work output (ẆTR), cooling output (C˙ cooling) and exergy efficiency (ηexergy) of the cycle. Therefore,
this conditional nature of E˙ Dx,OC is addressed here through the optimization of an integrated objective function
addressing each of the desired performance parameters using a dual-mode dragonfly algorithm. The optimization
is performed for a range of strong solution concentration, boiler temperature and pressure, in which only the first
two parameters are independently varying, while the third is dependent on the previous parameters to ensure
partial vaporization. The temperature of the strong solution is kept below its bubble temperature while recovering heat from the hot liquid condensate so that there is no vaporization before entering the boiler. When the
present optimization approach is performed for a given set of operational parameters, the values of ẆTR, C˙ cooling
and ηexergy are observed to improve by 1.84, 6.74, and 1.33 times, respectively with 1.35 times compromise in
E˙ Dx,OC, with respect to the conventional practice. The temperature of the strong solution is kept below its Tbubble
while recovering heat from the liquid condensate by performing pinch point calculations.
