水箱储冷夜空辐射制冷系统模型及其动态特性

摘要

Taking a nocturnal radiation refrigeration system with tank cooling storage as a research object,presents a numerical heat transfer model of nocturnal radiator and a water tank stratification cooling storage model based on transient heat balance theory.Analyses the dynamic operating characteristics in cooling season (from May to September)of Chongqing.The results indicate that the operating process of the nocturnal radiation system with tank cooling storage has two stages:initial stage and cooling stage.The cooling capacity of nocturnal radiator increases rapidly in the initial stage influenced by initial system temperature and the water tank stratification,and so on.In the cooling stage,the cooling capacity and the storage capacity decrease because of the decreased water temperature of the cooling media.%以水箱储冷夜空辐射制冷系统为研究对象,基于瞬态热平衡原理,建立了夜空辐射器的数值传热模型及水箱分层储冷模型,模拟分析了重庆市气候条件下系统在供冷季节(5-9月)的动态运行特性.研究表明:水箱储冷夜空辐射制冷系统运行过程存在2个阶段:初始阶段和储冷阶段.初始阶段受系统初始温度、水箱温度分层效应等影响,辐射器制冷量迅速升高;储冷阶段受储冷介质温度降低的影响,辐射器制冷量呈下降趋势,水箱储冷量也有所降低.