冷库冰水混合间接换热器的传热与流动特性  

Heat transfer and flow performance of indirect heat exchanger by mixed ice water based on natural cold resource

作　　者：周福君[1] 潘小莉[1] 王文明[1] 

机构地区：[1]东北农业大学工程学院,哈尔滨150030

出　　处：《农业工程学报》2015年第13期281-285,共5页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家科技支撑计划课题(2014BAD06B04-04)

摘　　要：北方地区冬季寒冷漫长,夏季炎热,冬季储冰夏季利用有利于节能减排。利用冰水混合间接换热系统进行冷量交换,不仅节能环保而且空气质量明显提高。采用有限体积法商业软件FLUENT,应用SIMPLE算法对翅片管式换热器平直翅片的换热与流动特性进行数值研究,计算结果与试验结果对比分析。结果表明:数值模拟与试验偏差不超过15%;迎面风速均匀分布情况下,随着迎面风速的增加,换热系数和压降分别增加了133%和428%;平均场协同角随迎面风速的增加而增大,速度场和温度场的协同程度变差,对换热不利;在相同的空气体积流量下,迎面风速沿冰水流动方向呈逐渐降低的分布方式对换热有利。According to the climatic characteristics of long cold winter days in the northern area, the storage of natural cold resources from winter are used for cooling in summer to achieve the goals of conserving energy and reducing carbon emission. To address the issues with regard to controlling the temperature and humidity of environment as well as the usage time of cold resources are short when natural cold resources are used for the storage and preservation of agricultural product through blowing the natural air into the ice storage directly, the ice-water mixture was used as the heat exchange medium and air quality was improved by means of indirect heat exchanger with inner loop cooling. The process route of freezing storage-release cold energy by mixing ice and water-exchange heat indirectly-temperature and humidity independently was proposed in this study. The laboratory used for the experiment was a closed storehouse with a size of 2 m × 2 m × 2 m. The ice water at 0.5℃ as coolant flowed from top to bottom in the finned tube heat exchanger by use of a water pump. The hot air of environment crossed finned tube under the action of the fan, then the water temperature rose when the cold water flowed through the copper tube wall to absorb heat of the tube outer surface and the fin surface. The cooling air was blown into the storage, the mixture of cooling air and fresh outdoor air exchanged heat in heat exchanger. The measuring element used in the experiment can be connected with the computer, and data acquisition using RMA411 remote input capture module, which can be carried out in 16 channels of analog data acquisition. The data output adopted the distal RM4024 analog output module, which can realize the output of four voltage signals, achieving real time communication between the host computer and data acquisition and output module, through the RS485 serial port. Temperature and humidity acquisition adopted Pt100 temperature sensor and humidity sensor series, respectively. The instrument used in the test was c

关 键 词：传热 冰 冷藏 自然冷资源 翅片管换热器 平直翅片 数值模拟 场协同 

分 类 号：TK172[动力工程及工程热物理—热能工程]