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双变量试差算法及其在循环水系统中的应用

Application of trial difference calculation method for bivariate in water cycle system
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摘要 基于末端热交换器冷流体流量核算的对数平均温差法,提出一种双变量试差计算方法以核算冷却循环水系统冷流体质量流量与出口温度。该算法将冷热流体出口温度约束引入换热器数学模型的求解过程中,选择末端换热器冷流体的质量流量、温度这2个变量代入换热器的热平衡方程和传热方程,计算换热量与热流体出口温度,不断修正冷流体质量流量与出口温度,直至热流体出口温度达到设定要求,且冷流体出口温度满足限制条件为止。以某工厂循环水系统节能优化设计为例,对比研究单变量试差法和双变量试差法在换热器冷流体流量核算中的应用。研究结果表明:按双变量试差法优化后的系统既能保障换热器的冷却效果,又能使冷流体出口温度满足控制要求。 Based on the logarithmic mean temperature difference method for calculating the cold fluid flow of end heat exchangers,a method of trial difference calculation for bivariate was proposed to calculate the mass flow rate and temperature of cold fluid.The algorithm adds temperature constrains at the outlet of cold and hot fluids to the calculation of the mathematical model of heat exchanger,and two variables,i.e.mass flow rate and temperature of cold fluid in the end heat exchanger,were chosen,and they were substituted into the thermal balance equation and heat transfer equation,the heat transfer rate and the outlet temperature of the hot fluid were calculated,and the mass flow rate and temperature of cold fluid were constantly corrected until the set requirements of the outlet temperature of the hot fluid were met and the cold fluid outlet temperature satisfied the restriction condition.Energy saving design for the water cycle system in one plant was taken as an example.The application of the method of trial difference calculation for bivariate and the traditional trial difference calculation method were comparatively studied in the flow calculation of the cold fluid of heat exchanger.The results show that the system optimized by the trial difference calculation for bivariate method can not only guarantee the cooling effect of heat exchanger,but also make the outlet temperature of the cold fluid meet the control requirements.
作者 孟志强 张沛 MENG Zhiqiang;ZHANG Pei(College of Electrical and Information Engineering,Hunan University,Changsha 410082,China)
出处 《中南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2019年第6期1492-1498,共7页 Journal of Central South University:Science and Technology
基金 国家重点研发计划项目(2016YFB0601302) 中央高校基本科研业务费专项资金资助项目(2015-001)~~
关键词 循环水系统 数学模型 双变量试差算法 优化配置 water cycle system mathematical model method of trial difference calculation for bivariate optimizing configuration
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