ABSTRACT
In furtherance of the exploitation of the vast potentials of Hibiscus Sabdariffa and to improve the efficiency of its drink production, the analysis of heat transfer properties of Hibiscus Sabdariffa (H.S) extract using a shell and tube heat exchanger was carried out in this study. The extraction of the H.S calyces was done using hot water between the temperatures 58oC – 82oC. The specific heat capacities for different concentration of H.S extract were obtained using Copper calorimeter. For concentration from 1.25-6.25g/cm3, the values of the Cpz were found to vary from 4.485-3.324J/goC. It implies that concentration of 6.25g/cm3 loses heat about 1.35 times faster than that at a concentration of 1.25g/cm3. The overall heat transfer coefficient of the H.S extract were obtained with values ranging from 2621.73-10486.88J/goC as H.S extract flowrate increased from 23-102cm3/sec. On varying the cooling water flowrate from 10-50cm3/sec, the overall heat transfer coefficient of the H.S extract also varied from 1607.30-5340.78J/goC.
