Volume 53

Comparative Study on the Thermodynamic Performance of the Solar Latent Heat Thermal Energy Storage System Using Different Storage Mediums Xin Jin, Chunjun Huang, Shi You

Abstract

In this study, a low-carbon solar water heating system integrated with salt hydrates as storage mediums was developed. The thermal performance of the heating system was tested using a full-scale experimental platform. A performance comparison was conducted between the system using sodium acetate trihydrate (SAT)-acetamide (AC) and one using SAT. The heating system incorporating the SAT-AC (phase-change temperature: 47.8 °C) showed an approximate 5.3% increase in the coefficient of performance compared to the system using SAT (phase-change temperature: 56 °C). Additionally, the discharging time for the SAT-AC unit was extended, benefiting from its optimal phase-change temperature. These findings indicate the promising potential of the selected salt hydrates for solar water heating applications and provide valuable guidelines for designing efficient heating systems.

Keywords solar heat collector, salt hydrates, latent heat thermal energy storage, phase-change temperature, energy efficiency