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

Abstract

Abstract. 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/desorption temperatures. The present study was aimed at examining 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 ten 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 at approximately 90 °C and 35 °C. The stored energy density during the desorption and adsorption was varied from 106.14 kWh/m3 to 119.53 kWh/m3, and 21.87 kWh/m3 to 27.99 kWh/m3, respectively. The change in mass caused by the multi-cycle test run was minimal for zeolite 5A. This makes it suitable for long-term energy storage without compromising 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.