CFD ANALYSIS OF A 24 HOUR OPERATING SOLAR REFRIGERATION ABSORPTION TECHNOLOGY (original) (raw)

A computational fluid dynamics (CFD) model is used to investigate outlet temperatures in heat exchanger within generator by varying fluid velocities and also used to investigate outlet temperature in evaporator and heat flux rate at walls of evaporator. The solar refrigeration absorption system taken for analysis is a continuously operating refrigerant storage system. R-717(Ammonia) is used as refrigerant. Aqua-ammonia vapor absorption refrigeration systems, which operate such that both, the generation of aqua ammonia vapors and the production of cold utilizing the generated aqua-ammonia vapors, take place at the same time are known as continuous-based operation systems. Model is completed using Solid works. Analysis is carried out in ANSYS 14. FLUENT is the software used to simulate fluid flow problems. It is generally used for computational Fluid Dynamics problems. It uses the finite-volume method to solve the governing equation for a fluid. It provides a wide field to solve problems. Numerical computations have been carried out to find coefficient of performance (COP). Variation of temperature at outlet of heat exchanger and evaporator are studied. Difference in maximum and minimum temperature at outlet of heat exchanger and evaporator at different fluid velocities are noted. The obtained profiles indicate variation in temperature of fluid. Graphs showing variation of COP with varying evaporator and generator temperatures are plotted. Air taken from outlet of evaporator via blower is used for refrigeration.