Abstract
In this work the combination of the refrigeration technique by semiconductors with calorimetry is proved to be effective through the development of a versatile semiconductor calorimetric system and the calorimetric measurements with it. Self-made semiconductor thermoelectric sensors and a semiconductor thermostat were used in this calorimetric system. The thermostat operates in a temperature range from 0 to 60°C. The sensitivity of the sensor is 25mV K-1 (not amplified). The versatility of this system has been demonstrated in the ability to make precision measurements in adiabatic or in isoperibol mode. The precision of measurements is about 0.06%. The value for the specific heat capacity of water, cp (298.15K), was obtained to be (4.176±0.013)JK-1 g-1 for measurements with the adiabatic calorimeter, and for the enthalpy of solution of KCl, ΔsolH(200 H2O, 298.15K) was (17.56±0.01) kJ mol-1 for measurements with the isoperibol calorimeter. These results are in good agreement with the values recommended by the Physical Chemistry Division of IUPAC in 1974.
