太阳能集管系统流量分配的理论和实验研究
|
摘要
集管系统在各类换热系统中具有广泛的运用,支管流量分配不均是集管系统的基本问题,流量分配不均对集管系统泵功消耗有较大的影响,因此集管系统内部流量分配的准确预测及优化至关重要。本文以常见的平板太阳能集热器为研究对象分析集管系统流量分布不均的问题,应用经典流体力学公式,通过连续性方程、能量守恒及动量守恒定律建立系统内部压力、流动阻力以及流量分配通用数学模型,编写C程序数值求解集热器系统压力与流量的分布规律并进行实验验证,结果表明:通过建立流量分配模型可以准确预测集管系统内的流动状况。集热器系统压力流量分布的理论预测模型具有广泛的适用性,对预测工业锅炉系统、太阳能集热系统及各种集管系统的流动阻力、流量分配及压力分布具有重要的借鉴意义。
Manifold system is widely used in various heat exchange systems. The uneven distribution of branch flow is the basic problem of the manifold system. The uneven distribution of flow rate has a great influence on the pump power consumption of the manifold system. Therefore, Accurate prediction and optimization of traffic distribution within the system is crucial. In this paper, the common flat-panel solar collectors are analyzed to analyze the problem of uneven distribution of flow in the Manifold system. By using the classical fluid mechanics formula, the internal pressure,flow resistance and flow distribution are established by the continuity equation, conservation of energy and the law of conservation of momentum General mathematical model and C program to calculate the distribution of pressure and flow in the collector system and verify the experimental results. The results show that the flow distribution model can accurately predict the flow in the header system. The theoretical predictive model of collector flow pressure distribution has a wide range of applicability. It is of great significance to forecast the flow resistance, flow distribution and pressure distribution of industrial boiler systems, solar collector systems and various manifold systems.
Manifold system is widely used in various heat exchange systems. The uneven distribution of branch flow is the basic problem of the manifold system. The uneven distribution of flow rate has a great influence on the pump power consumption of the manifold system. Therefore, Accurate prediction and optimization of traffic distribution within the system is crucial. In this paper, the common flat-panel solar collectors are analyzed to analyze the problem of uneven distribution of flow in the Manifold system. By using the classical fluid mechanics formula, the internal pressure,flow resistance and flow distribution are established by the continuity equation, conservation of energy and the law of conservation of momentum General mathematical model and C program to calculate the distribution of pressure and flow in the collector system and verify the experimental results. The results show that the flow distribution model can accurately predict the flow in the header system. The theoretical predictive model of collector flow pressure distribution has a wide range of applicability. It is of great significance to forecast the flow resistance, flow distribution and pressure distribution of industrial boiler systems, solar collector systems and various manifold systems.
引文
[1]Zimmermann S,Helmers H,Tiwari M K,et al.Advanced Liquid Cooling in HCPVT Systems to Achieve Higher Energy Efficiencies[C]//American Institute of Physics.2013:248-251
[2]Mojumder J C,Wen T C,Ong H C,et al.An Experimental Investigation on Performance Analysis of air Type Photovoltaic Thermal Collector System Integrated with Cooling Fins Design[J].Energy&Buildings,2016,130:272-285
[3]Chiou J P.The Effect of Nonuniform Fluid Flow Distribution on the Thermal Performance of Solar Collector[J].Solar Energy,1982,29(6):487-502
[4]Bajura R A,Jones E H J.Flow Distribution Manifolds[J].Asme Transactions Journal of Fluids Engineering,1976,98(4):654-665
[5]Facao J.Optimization of Flow Distribution in Flat Platesolar Thermal Collectors with Riser and Header Arrangements[J].Solar Energy,2015,120:104-112
[6]赵镇南.集管系统压力与流量分布的研究(Ⅰ)-U型置时析解[J].太阳能学报,1999,20(4):377-384ZHAO Zhennan.Investigation on Pressure and Flow Distribution in Manifolds(I):Analytical Solution for UType Arrangement[J].Acta Energiae Solaris Sinica,1999,20(4):377-384
[7]赵振南.集管系统压力与流量分布的研究(Ⅱ)-Z型布置时的分析解[J].太阳能学报,2001,22(3):363-366ZHAO Zhennan.Investigation on Pressure and flow Distribution in Manifolds(II):Analytical Solution for ZType Arrangement[J].Acta Energiae Solaris Sinica,2001,22(3):363-366
[8]Wang C C,Yang K S,Tsai J S,et al.Characteristics of Flow Distribution in Compact Parallel Flow Heat Exchangers,Part I:Typical Inlet Header[J].Applied Thermal Engineering,2011,31(16):3226-3234
[9]Denn M M.Process Fluid Mechanics[M].Prentice-Hall,1980:246-273
[10]Paritosh V.Fluid flow in T-junction of pipes[D].Lappeenranta University of Technology,2007
[11]华绍曾.实用体阻手册[M].国防工业出版社,1985:307-358HUA Shaozeng.Handbook of Practical Fluid Resistance[M].National Defense Industry Press,1985:307-358
[12]胡明辅,别玉,卜江华.太阳能集热器阵列流量均布模型[J].太阳能学报,2011,32(1):60-65HU Mingfu,BIE Yu,BU Jianghua.Mathematical Model of Uniform Flow Distribution in Solar Collector Arrays with Subcollectors Connected in Parallel[J].Acta Energiae Solaris Sinica,2011,32(1):60-65
[13]Nayak J K,Amer E H.Experimental and Theoretical Evaluation of Dynamic Test Procedures for Solar Flat Plate Collectors[J].Solar Energy,2000,69(5):377-401
[14]Weitbrecht V,Lehmann D,Richter A.Flow Distribution in Solar Collectors with Laminar Flow Conditions[J].Solar Energy,2002,73(6):433-441
[2]Mojumder J C,Wen T C,Ong H C,et al.An Experimental Investigation on Performance Analysis of air Type Photovoltaic Thermal Collector System Integrated with Cooling Fins Design[J].Energy&Buildings,2016,130:272-285
[3]Chiou J P.The Effect of Nonuniform Fluid Flow Distribution on the Thermal Performance of Solar Collector[J].Solar Energy,1982,29(6):487-502
[4]Bajura R A,Jones E H J.Flow Distribution Manifolds[J].Asme Transactions Journal of Fluids Engineering,1976,98(4):654-665
[5]Facao J.Optimization of Flow Distribution in Flat Platesolar Thermal Collectors with Riser and Header Arrangements[J].Solar Energy,2015,120:104-112
[6]赵镇南.集管系统压力与流量分布的研究(Ⅰ)-U型置时析解[J].太阳能学报,1999,20(4):377-384ZHAO Zhennan.Investigation on Pressure and Flow Distribution in Manifolds(I):Analytical Solution for UType Arrangement[J].Acta Energiae Solaris Sinica,1999,20(4):377-384
[7]赵振南.集管系统压力与流量分布的研究(Ⅱ)-Z型布置时的分析解[J].太阳能学报,2001,22(3):363-366ZHAO Zhennan.Investigation on Pressure and flow Distribution in Manifolds(II):Analytical Solution for ZType Arrangement[J].Acta Energiae Solaris Sinica,2001,22(3):363-366
[8]Wang C C,Yang K S,Tsai J S,et al.Characteristics of Flow Distribution in Compact Parallel Flow Heat Exchangers,Part I:Typical Inlet Header[J].Applied Thermal Engineering,2011,31(16):3226-3234
[9]Denn M M.Process Fluid Mechanics[M].Prentice-Hall,1980:246-273
[10]Paritosh V.Fluid flow in T-junction of pipes[D].Lappeenranta University of Technology,2007
[11]华绍曾.实用体阻手册[M].国防工业出版社,1985:307-358HUA Shaozeng.Handbook of Practical Fluid Resistance[M].National Defense Industry Press,1985:307-358
[12]胡明辅,别玉,卜江华.太阳能集热器阵列流量均布模型[J].太阳能学报,2011,32(1):60-65HU Mingfu,BIE Yu,BU Jianghua.Mathematical Model of Uniform Flow Distribution in Solar Collector Arrays with Subcollectors Connected in Parallel[J].Acta Energiae Solaris Sinica,2011,32(1):60-65
[13]Nayak J K,Amer E H.Experimental and Theoretical Evaluation of Dynamic Test Procedures for Solar Flat Plate Collectors[J].Solar Energy,2000,69(5):377-401
[14]Weitbrecht V,Lehmann D,Richter A.Flow Distribution in Solar Collectors with Laminar Flow Conditions[J].Solar Energy,2002,73(6):433-441