相变储热式太阳能干燥系统连续干燥性能研究  

Continuous drying performance of phase change thermal storage solar drying system

作　　者：李晓霞 王颢蒙 元国彬 郭枭 靳立丰 李金平[1,2,3] LI Xiaoxia;WANG Haomeng;YUAN Guobin;GUO Xiao;JIN Lifeng;LI Jinping(College of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Collaborative Innovation Center for Supporting Technology of Northwest Low-Carbon Towns,Lanzhou 730050,China;Gansu Key Laboratory of Complementary Energy System of Biomass and Solar Energy,Lanzhou 730050,China)

机构地区：[1]兰州理工大学能源与动力工程学院,兰州730050 [2]西北低碳城镇支撑技术协同创新中心,兰州730050 [3]甘肃省生物质能与太阳能互补能源系统重点实验室,兰州730050

出　　处：《农业工程学报》2025年第7期269-276,共8页Transactions of the Chinese Society of Agricultural Engineering

基　　金：兰州理工大学红柳优秀青年人才支持计划项目(Q2024);兰州理工大学教师博士基金项目(062305);兰州市青年科技人才创新项目(2024-QN-190);甘肃省重点研发计划项目(25YFGA036)。

摘　　要：为了解决传统太阳能干燥系统因太阳能不连续性和间断性导致的无法实现连续温度干燥的问题,该文设计了一种相变储热式太阳能干燥系统,旨在提高干燥效率、延长系统运行时间,并减少干燥室入口温度的波动。研究开发了两个TRNSYS模块(相变储热模块和干燥室模块),并结合TRNSYS其他标准模块搭建了相变储热式太阳能干燥系统仿真模型。以兰州市为例,模拟分析了系统在不同时间尺度(典型天气和7月1日至7月8日一周天气)下连续运行的动态特性及热性能。结果表明:在夏至日工况下,相比传统无蓄热太阳能干燥系统,相变储热式太阳能干燥系统干燥室平均入口温度提高10.34%,运行时间延长了3.7 h。在连续一周的运行中,系统干燥温度超过35℃的时间占比达到了72.7%,干燥室全天平均入口温度为57.3℃。特别是在7月2日8:00至7月3日8:00的运行过程中,干燥室入口温度超过35℃的时间占比达91.5%,夜间平均入口温度高达41.2℃,几乎实现了24 h的连续干燥能力。此外,相变材料的熔点对系统性能影响显著,低熔点材料在夜间干燥过程中表现出更佳的温度保持能力。该研究通过TRNSYS模拟相变储热式太阳能干燥系统在不同时间尺度和不同工况下的运行情况,揭示连续干燥下系统性能的动态变化规律,为进一步的太阳能干燥系统设计优化提供重要参考。Drying can represent a critical process in both the industrial and daily life;It is often required to reduce the energy consumption during drying.Alternatively,solar drying can be expected to replace the traditional drying,due to the low carbon footprint and economic advantages.Among them,solar drying systems with the phase change materials(PCM)can also maintain the high drying efficiency,such as the simple structure and low cost.The operational time can also be significantly extended,compared with the solar-heat pump hybrid drying.Nevertheless,it is still lacking on the long-term continuous operation of these systems.In the present study,a numerical model was proposed for the PCM thermal storage unit in the drying chamber.The innovative concept of equivalent drying time was incorporated to facilitate the accurate prediction of drying curves under various operating conditions.A series of experiments were also carried out to validate the predictions.There was the close match between the prediction and measured data,with an average error of less than 5%.A dynamic simulation model of the PCM solar drying system was developed using the TRNSYS platform.The performance of system was evaluated at daily(a typical day of the summer solstice)and weekly(July 1 to July 8)time scales.The results indicate that the integrated PCM solar drying system was significantly enhanced the drying performance,compared with the traditional solar drying systems without thermal storage.Specifically,the average inlet temperature of the drying chamber increased by 10.34%,and the daily operating duration was extended by approximately three hours.Furthermore,the system was maintained a drying temperature above 35°C for 72.7%of the time during a continuous week of operation,with a daily average inlet temperature of 57.3°C.The nighttime inlet temperature reached 41.2°C under typical conditions.The duration above 35°C was accounted for 91.5%.The continuous drying was effectively achieved throughout the day.The simulation of performance was also

关 键 词：太阳能干燥 相变储热 TRNSYS模拟 连续干燥性能 动态特性 

分 类 号：S126[农业科学—农业基础科学]