Heat Transfer Characteristics of Passive Solar Porous Thermal Storage Wall with Heat Absorption and Storage

This work investigates the heat transfer performance of a porous thermal storage wall (PTSW) based on a composite sorbent of hydrates for the solar energy direct storage and conversion process under dynamic variations in solar irradiance and ambient temperature. The results indicate that during the charging phase with solar irradiation, the temperature of the PTSW and the outlet air temperature of the channel first increase and then decrease, reaching their maximum values at 14:30, approximately 67.5◦C and 47.9◦C, respectively. Before 20:00, the outlet temperature remains above 30◦C, and the desorption conversion rate at this time is 0.82. During the discharging phase, the temperature initially increases and then stabilizes. The adsorption conversion rate at 09:00 the next day is approximately 0.75, and the outlet temperature during the stable period is around 39.7◦C. This PTSW enables the efficient utilization of solar heat with extended heating periods. © 2024 Science Press. All rights reserved.