Recent trends on energy-efficient solar dryers for food and agricultural products drying:a review  

作　　者：Kavati Venkateswarlu S.V.Kota Reddy 

机构地区：[1]Mechanical Engineering,School of Engineering and the Built Environment,JEDS Campus,University of Namibia,Private Bag 3624,Ongwediva,Oshakati Region,Namibia [2]School of Mechanical Engineering(SMEC),VIT-AP University,Amaravati,Andhra Pradesh,522237,India

出　　处：《Waste Disposal and Sustainable Energy》2024年第3期335-353,共19页废弃物处置与可持续能源（英文）

摘　　要：The energy efficiency enhancement of solar dryers has attracted the attention of researchers worldwide because of the need for energy storage in solar drying applications,which arises primarily from the irregular nature of solar energy that leads to improper drying which will reduce the quality of the products being dried.This work comprehensively reviews the state-of-the-art research carried out on solar dryers for energy efficiency enhancement using various alternative strategies,including hybrid solar dryers that use auxiliary heating sources,such as electric heaters or biomass heaters,solar-assisted heat pump dryer,use of desiccant materials,and heat storage systems that use both sensible and latent heat storage.The advent of phase change materials(PCM),such as thermally and chemically stable PCMs,for long-term storage,bio-degradable and bio-compatible PCM materials to alleviate the negative environmental impact of conventional PCMs is also presented.The performance parameters considered for evaluating dryers include the maximum temperature attained inside the drying chamber,drying time and efficiency,specific moisture extraction rate(SMER),energy and exergy efficiency and CO_(2) mitigation effect.The factors considered to analyze the PCMs application in solar dryers include cost and sustainability of PCMs,and both energy and exergy analyses of dryers using PCMs.The gaps in current knowledge and future scope for further improvement of solar dryers are also elucidated.

关 键 词：Agricultural and food products Desiccant materials Hybrid dryers Phase change material Solar-assisted heat pump dryers Thermal energy storage 

分 类 号：TK51[动力工程及工程热物理—热能工程]