光伏光热一体化系统流量的分析与优化  

Analysis and optimization of the flow rate of the PV/T system

作　　者：王博飞 李舒宏[1] WANG Bofei;LI Shuhong(School of Energy and Environment,Southeast University,Nanjing 210096,Jiangsu,China)

机构地区：[1]东南大学能源与环境学院,江苏南京210096

出　　处：《化工进展》2018年第10期3826-3831,共6页Chemical Industry and Engineering Progress

摘　　要：建立水冷型PV/T热水系统模型并搭建实验台,从发电量、集热量和水泵耗电量各方面考虑,模拟计算流量变化对系统性能的影响,并结合相对应工况下的实验数据进行对比分析。结果表明:存在最佳流量值使得水冷型PV/T系统综合效率最大,最佳流量值大小与太阳辐射值为正系数线性关系,南京夏季典型工况下系统的最佳流量在0.02kg/(s·m^2)左右。以此为基础,本文提出了变流量运行方式优化系统性能,即根据太阳辐射强度调整系统运行流量使水冷型PV/T全天运行时刻处于最高综合效率,结果表明:以实际工程0.072m^3/(h·m^2)定流量运行为参照实验,全天运行变流量系统实际能量比其多收益19808J。因此,对PV/T系统流量的分析和优化是极有意义的,变流量运行有实际应用前景。Numerical and experimental analyses of a water-cooled PV/T hot water system was conducted in this paper.Power generations,heating energy collected by PV/T system,and power consumption of pump were three main characteristics to evaluate the effect of flow changes on the system performance.In addition,the mathematical model was verified and compared with the experimental data.Results indicated that the optimal flow rate value,which maximized the overall efficiency of a water-cooled PV/T system,did exist.Hence,the optimal flow rate value and the solar radiation intensity have a positive linear relationship and the optimal flow rate under typical summer condition of Nanjing is about 0.02 kg/(s·m2).Furthermore,a variable-flow operation mode was proposed to optimize the performance of system,where operating flow is adjusted according to the solar radiation intensity to ensure that water-cooled PV/T system can operate at the highest overall efficiency all day.The results showed that variable-flow mode can receive 19808J more energy than that of constant-flow mode in which flow rate is kept at 0.072m3/(h·m2).Therefore,analysis and optimization of flow rate in PV/T system is of practical significance and the application of variable-flow operation is promising.

关 键 词：水冷型PV/T系统 模拟 最佳流量值 变流量运行 

分 类 号：TK519[动力工程及工程热物理—热能工程]