Performance of heat charge/discharge of magnesium nitrate hexahydrate and magnesium chloride hexahydrate mixture to a single vertical tube for a latent heat storage system

The authors focused on a mixture of magnesium nitrate hexahydrate as a base material and magnesium chloride hexahydrate as an additive to store and utilize urban waste heat from emerged co-generation systems, typically available at temperatures of 60–90 °C. The second paper revealed that this mixture has good thermal characteristics as a PCM for latent thermal energy storage. In this study, heat charging and discharging experiments were done using a heat storage tank with a simple vertical heat exchange unit. These showed that effective use of the phase change temperature region resulted in an available enthalpy of 2.0–2.5 times that of sensible heat storage in water. In addition, corrosion tests were conducted and results showed SUS316 and aluminum can be used to build storage tanks and heat exchangers for this mixture.