HEAT-EXCHANGE CALORIMETRY OF THE FLOW-TYPE

Heat-exchange calorimetry has been extended to the flow type. Two glas s vessels for the sample and a reference are fixed separately in a pre cision water bath. In each vessel, a thermistor, a heater element, an inlet of the solution and an outlet for any overflow are installed. He at released in the sample vessel is freely exchanged with the ambient water. The temperature in each vessel is observed by a thermistor asso ciated with a Wheatstone bridge. The amplified output is introduced in to an analog computation circuit in order to calculate the total heat effect. A constant related to the heat transfer of vessels was theoret ically found to be proportional to the flow rate; it was subsequently confirmed experimentally by changing the flow rate from 30 g/min to ze ro, corresponding to the batch type. Since the constancy of the perist alsis pumps is not satisfactory, the flow rate at every setting is obs erved by means of time and mass measurements. The necessary evaluation s for precision and reproducibility are executed in water by electric heating; successful results were obtained for practical use.