Experimental Investigation of Pool Boiling Heat Transfer in Ammonia–Water–Lithium Nitrate Solution

Abstract

The nucleate pool boiling heat transfer coefficient of an NH3-H2O-LiNO3 mixture was investigated on a cylindrical heated surface at low pressure of 4 to 8 bar, low ammonia mass fraction of 0 < xNH3 < 0.3, and different heat fluxes. The lithium nitrate concentration of the solution was chosen in the range of 10–50% of mass ratio of lithium nitrate in pure water. The effects of concentrations, heat flux, and pressure on boiling heat transfer coefficient was studied. The results indicate that the heat transfer coefficient in the mixture decreases with increase in ammonia mass fraction, increases with the addition of lithium nitrate, and increases with an increase in heat flux and pressure in the investigated range.