Experimental Evaluation of Zeolite 5A for Low-Temperature Thermochemical Energy Storage

Zeolites are suitable for thermochemical energy storage (TCES) because of their high energy density, thermal stability, and rapid reaction kinetics. However, these zeolites exhibit high regeneration/charging temperatures. The present study was aimed to examine the thermal stability and energy storage density of zeolite 5A using an open sorption system. The energy storage and recovery characteristics of zeolite 5A were studied through successive desorption and adsorption for 10 cycles. Further, the performance parameters were investigated to determine whether the system is suitable for the intended applications. The charge and discharge operations were performed approximately at 90°C and 35°C. The stored energy density during the desorption and adsorption was varied from 106.14 to 119.53 kWh/m3, and 21.87 to 27.99 kWh/m3 respectively. The change in mass caused by the multi-cycle test run were minimal for zeolite 5A. This makes it suitable for long-term energy storage without compromising on its thermal stability. The current work has shown technological proficiency in applying energy sources including solar energy and industrial waste heat for low-temperature energy needs like water heating and building space heating.