一种新型溶液除湿装置数学模型及性能分析
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摘要
对新型外表面蒸发式溶液除湿装置建立数值模型,模拟计算各参数对装置性能的影响。结果表明:管心距的增加会降低装置整体的除湿效果;肋间距对装置的除湿效果影响不大;蒸发冷却空气质量流量在0.5～4 kg/(m~2·s)变化时,新型外表面蒸发式除湿装置除湿量相对非蒸发型装置提高6.3%～9.4%;装置的最佳蒸发冷却空气流量约为2.5 kg/(m~2·s);除湿空气质量流量在1.8～1.9 kg/(m~2·s)变化时,除湿量有一个突变过程;溶液入口温度增加20℃,除湿量降低4.0%,除湿空气出口温度仅升高1℃。这些结果可为除湿装置结构设计和性能分析提供理论依据。
The mathematical model for a new type of external surface evaporative liquid dehumidification device was established,and the effect of parameters on the performance of device was simulated and calculated. The results show that the increase of tube center distance will reduce the overall dehumidification effect of the device;the rib spacing has little effect on the dehumidification effect of the device;the mass flow rate of evaporative cooling air varies from 0.5 to 4 kg/(m~2· s),and the dehumidification capacity of the new external surface evaporative dehumidification device is increased by 6.3%-9.4% compared with the non-evaporation type device;The optimum evaporative cooling air flow rate of the device is about 2.5 kg/(m~2·s);when the dehumidified air mass flow is changed from 1.8 to 1.9 kg/(m~2·s),the dehumidification amount has a mutation process;The solution inlet temperature is increased by 20 ℃,the dehumidification amount is reduced by 4.0%,and the dehumidified air outlet temperature is only increased by 1 ℃.These results provide a theoretical basis for structural design and performance analysis of dehumidification devices.
The mathematical model for a new type of external surface evaporative liquid dehumidification device was established,and the effect of parameters on the performance of device was simulated and calculated. The results show that the increase of tube center distance will reduce the overall dehumidification effect of the device;the rib spacing has little effect on the dehumidification effect of the device;the mass flow rate of evaporative cooling air varies from 0.5 to 4 kg/(m~2· s),and the dehumidification capacity of the new external surface evaporative dehumidification device is increased by 6.3%-9.4% compared with the non-evaporation type device;The optimum evaporative cooling air flow rate of the device is about 2.5 kg/(m~2·s);when the dehumidified air mass flow is changed from 1.8 to 1.9 kg/(m~2·s),the dehumidification amount has a mutation process;The solution inlet temperature is increased by 20 ℃,the dehumidification amount is reduced by 4.0%,and the dehumidified air outlet temperature is only increased by 1 ℃.These results provide a theoretical basis for structural design and performance analysis of dehumidification devices.
引文
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[14]Fumo N,Goswami D Y.Study of an aqueous lithium chloride desiccant system:Air dehumidification and desiccant regeneration[J].Solar Energy,2015,72(4):351-361.
[15]Conde M R.Properties of aqueous solutions of lithium and calcium chlorides:Formulations for use in air conditioning equipment design[J].International Journal of Thermal Sciences,2004,43(4):367-382.
[16]Sparrow E M,Lin S H.Heat-transfer characteristics of polygonal and plate fins[J].International Journal of Heat&Mass Transfer,1964,7(8):951-953.
[17]彦启森,石文星,田长青.空气调节用制冷技术.第4版[M].北京:中国建筑工业出版社,2010,93-94.[17]Yan Qisen,Shi Wenxing,Tian Changqing.Refrigeration technology for air conditioning,4th edition[M].Beijing:China Building Industry Press,2010:93-94.
[2]Yin Yonggao,Qian Junfei,Zhang Xiaosong.Recent advancements in liquid desiccant dehumidification technology[J].Renewable&Sustainable Energy Reviews,2014,31:38-52.
[3]Mohammad A T,Mat S B,Sopian K,et al.Review:Survey of the control strategy of liquid desiccant systems[J].Renewable&Sustainable Energy Reviews,2016,58:250-258.
[4]张小松,殷勇高,曹毅然.蓄能型液体除湿冷却空调系统的建立与实验研究[J].工程热物理学报,2004,25(4):546-549.[4]Zhang Xiaosong,Yin Yonggao,Cao Yiran.Experimental study on the performance of liquid desiccant cooling air conditioning[J].Journal of Engineering Thermophysics,2004,25(4):546-549.
[5]Yin Yonggao,Zhang Xiaosong,Wang Geng,et al.Experimental study on a new internally cooled/heated dehumidifier/regenerator of liquid desiccant systems[J].International Journal of Refrigeration,2008,31(5):857-866.
[6]Zhang Tao,Liu Xiaohua,Jiang Jingjing,et al.Experimental analysis of an internally-cooled liquid desiccant dehumidifier[J].Building&Environment,2013,63(63):1-10.
[7]Qi Ronghui,Lu Lin,Yang Hongxing.Development of simplified prediction model for internally cooled/heated liquid desiccant dehumidification system[J].Energy&Buildings,2013,59(4):133-142.
[8]Sohani A,Sayyaadi H,Balyani H H,et al.A novel approach using predictive models for performance analysis of desiccant enhanced evaporative cooling systems[J].Applied Thermal Engineering,2016,107:227-252.
[9]Gao W Z,Cheng Y P,Jiang A G,et al.Experimental investigation on integrated liquid desiccant-Indirect evaporative air cooling system utilizing the MaisotesenkoCycle[J].Appzlied Thermal Engineering,2015,88:288-296.
[10]Cui X,Islam M R,Mohan B,et al.Theoretical analysis of a liquid desiccant based indirect evaporative cooling system[J].Energy,2016,95:303-312.
[11]彭冬根.外表面蒸发式溶液除湿系统及方法[P].中国:102538090A,2012-07-04.
[12]Gnielinski V.New equations for heat and mass transfer in turbuleznt pipe and channel flow[J].International Journal of Chemical Engineering,1976,16(2):8-16.
[13]Chung T W,Ghosh T K,Hines A L.Comparison between random and structured packings for dehumidification of air by lithium chloride solutions in a packed column and their heat and mass transfer correlations[J].Industrial&Engineering Chemistry Research,1996,35(1):192-198.
[14]Fumo N,Goswami D Y.Study of an aqueous lithium chloride desiccant system:Air dehumidification and desiccant regeneration[J].Solar Energy,2015,72(4):351-361.
[15]Conde M R.Properties of aqueous solutions of lithium and calcium chlorides:Formulations for use in air conditioning equipment design[J].International Journal of Thermal Sciences,2004,43(4):367-382.
[16]Sparrow E M,Lin S H.Heat-transfer characteristics of polygonal and plate fins[J].International Journal of Heat&Mass Transfer,1964,7(8):951-953.
[17]彦启森,石文星,田长青.空气调节用制冷技术.第4版[M].北京:中国建筑工业出版社,2010,93-94.[17]Yan Qisen,Shi Wenxing,Tian Changqing.Refrigeration technology for air conditioning,4th edition[M].Beijing:China Building Industry Press,2010:93-94.