Paper presented at the 5th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 1-4 July, 2007.
The present study numerically investigated the effect of
tube arrangement of the high temperature generator (HTG) on
the thermal performance of a double effect LiBr-water
absorption system with the cooling capacity of 210
refrigeration tons. The HTG tubes were located after a metal
fiber burner. The HTG was consisted with a set of circular
tubes and flattened tubes in series. LiBr aqueous weak solution
was flowed into the generator tube, and then turned to strong
solution at the exit of the HTG tubes. FLUENT, as a
commercial code, was used to estimate the thermal
performance of the HTG. Standard k-ε model was applied for
combustion gas-side turbulent flow around the HTG tubes. Key
parameters were size of the circular tubes and spacing ratio of
flattened and circular tubes in HTG. Temperature and velocity
profiles around the tubes of the HTG with the same total heat
transfer area were calculated to estimate the thermal
performance of the HTG and to find out the optimal condition.
The minimum exhaust temperature of the HTG was 214 at
the spacing ratio of flattened tube of 0.73.