Abstract:
The traditional Double Effect Absorption Refrigeration Cycle (DE-ARC) series and parallel
configuration cascaded with the conventional Vapor Compression Refrigeration (VCR)
technology solves the limitations faced with these standalone respected cycles. Although these
systems (Compression Double Effect Absorption Cycle (C-DAC (Series), C-DAC (Parallel)))
have difficulties in utilizing high waste heat recovery and consume high compressor power.
Regarding these limitations, in our present study, a modified DE-ARC (Series and Parallel)
with a Refrigerant Heat Exchanger (RHX) is combined with an improved vapor compression
refrigeration (VCR) system that includes an ejector, resulting in the development of the
proficient Ejector Double Effect Absorption Cycle. (E-DAC (Series), E-DAC (Parallel)) and
Ejector Injection Double Effect Absorption Cycle (EI-DAC (Series), EI-DAC (Parallel)) using
LiBr/H2O and R41 as the working fluid. The Engineering Equation Solver (EES) is employed
to generate a numerical model for the purpose of conducting a thorough analysis based on the
concepts of energy, mass, and exergy conservation, encompassing both the first and second
laws of thermodynamics. The results indicate that the four suggested systems outperform the
traditional cascaded cycles. Among these four combinations, the EI-DAC (Parallel)
configuration shows the highest performance, with an improvement of approximately 16.5%
and 14% compared to the C-DAC (Series) and C-DAC (Parallel) configurations, respectively.
Further analysis reveals that the coefficient of performance (COP) of our proposed systems
exhibits a linear relationship with the evaporator temperature. Furthermore, the systems exhibit
improved performance at higher generator temperatures, making them well-suited for utilizing
larger quantities of waste heat while still being able to operate at lower evaporator temperatures.
Output of this comprehensive theoretical thermodynamic study yield a thorough
comprehension of the performance of E-DAC (Series and Parallel) and EI-DAC (Series and
Parallel) systems and provide useful suggestions for future enhancement and optimization
Description:
Supervised by
Dr. Mohammad Monjurul Ehsan,
Professor,
Department of Production and Mechanical Engineering(MPE),
Islamic University of Technology (IUT)
Board Bazar, Gazipur-1704, Bangladesh
This thesis is submitted in partial fulfillment of the requirement for the degree of Bachelor of Science in Mechanical Engineering, 2024
