?DERIVATION OF RELATIONSHIPS AND ESTIMATION OF THERMAL/THERMODYNAMIC PARAMETERS FROM CRYSTALLIZATION DATA OF BITTERN

Abstract

During low temperature crystallization studies of magnesium sulphate from sea bittern, the time temperature plots have
been found to be linear. This uncommon phenomenon in unsteady state operation has been explained through modified
energy balance equation in terms of rate of overall heat changes associated with crystallization, characteristic properties of
raw material, overall averages temperature drop and system constants. While explaining the linearity of the plots, the
authors have not only deduced a law concerning low temperature crystallization and the conditions in which it is operative
but also derived relationships for estimating heat of crystallization, heat transfer co-efficient and heat utilization co-
efficient. It is observed that the composition of raw material (bittern) has a direct effect on specific heat and slope of
temperature-time relationship, whereas heat of crystallization is governed by the type of sample used heated or normal.The
numerical results have also established that it is rather the design of the cooling unit (chiller) which governs its efficiency
whereas increase in chilling capacity enhances the output only (heat transfer co-efficient). Further, the statistical analysis
of the numerical data revealed that in different situations it is not only normally distributed but also found substantiating
the conclusions drawn from the observed data.