被动式太阳能多孔吸附储热墙传热特性

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

本文研究了在太阳辐照强度和环境温度动态变化条件下,基于水合盐复合吸附剂的多孔蓄热墙用于太阳能直接储存转化过程的传热性能。结果表明,在有辐照的充热阶段,多孔蓄热层和流道空气出口温度先升高后降低,最大值出现在14:30时,分别约为67.5℃和47.9℃。20:00之前出口温度高于30℃,此时脱附转化率为0.82。释热阶段温度先增长后趋于平稳,次日09:00时的吸附转化率约0.75,稳定期的出口温度约39.7℃,该吸附剂蓄热层能够充分利用太阳热能实现更长时间的供热。

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.