Usability of NaNO2 for latent heat storage applications

Abstract

Enthalpy of fusion and heat capacity of NaNO2 were determined. The heat capacity measurements were performed in the temperature range 0–310 °C by using two types of calorimeters. Melting point of NaNO2 was detected at 280.7 ± 0.2 °C and the corresponding heat of fusion was found to be 13.9 ± 0.2 kJ mol−1. Thermal stability of the studied material was first investigated using simultaneous TG-DTA and was followed by DSC accelerated thermal cycle tests afterwards. During these tests 300 heating/cooling thermal cycles were performed through the melting region of NaNO2-enthalpies, onset and peak temperatures of fusion and crystallization were determined from these measurements.