HEAT-TRANSFER DURING POOL BOILING OF LIBR-WATER SOLUTIONS AT SUBATMOSPHERIC PRESSURES

This paper reports some important results of an experimental investiga tion carried out to study the heat transfer coefficients during pool b oiling of lithium bromide-water solutions over horizontal stainless st eel tubes. An experimental setup was fabricated to conduct the experim ents and data were collected in a heat flux range of 15 to 108 kW/m2 s ystem pressure of 4 to 9.93 kPa and for a three-fold variation in the lithium bromide mass concentration. Three stainless steel tubes of dif ferent diameters were used as the test lengths. The study of the local and average heat transfer coefficients indicated that the boiling phe nomenon is not significantly affected by tube diameter. The solution c oncentration is a dominant factor and as it increases heat transfer co efficient decreases and the local heat transfer coefficients decrease especially at sides and bottom.