低品位热驱动混合溶液除湿降温系统性能分析
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摘要
对低品位热驱动混合溶液除湿降温系统的性能进行了模拟研究.基于混合溶液传质关联式,对混合溶液除湿、再生过程进行了数学建模,比较了不同浓度溶液除湿器和再生器出口空气含湿量的实验值与模型计算值,其误差均在10%之内,从而验证了模型的可靠性.模拟分析了混合溶液浓度对系统性能的影响,模拟结果表明:在设计工况下,使用48%混合溶液的系统送风参数为19℃,9. 7 g/kg,氯化钙和氯化锂的混合溶液的除湿能力与氯化锂溶液相当,而混合溶液成本则大大降低,成本最高可降低65. 7%;随着混合溶液浓度的增加,系统热力性能提高且输配能耗降低,但也会导致送风温度及含湿量偏高,因此为了满足送风及节能需求,需要合理地选择氯化钙和氯化锂的混合溶液浓度.
The performance of liquid desiccant cooling system using mixed solution driven by lowgrade heat source was simulated. A mathematical model for the major components of the system was established based on the dimensionless experimental correlations of Sherwood number of the mixed solution to investigate the effect of concentration of mixed solution on performance of this system.The experimental values and calculated values of humidity ratio of air at the outlet of the dehumidifier and regenerator were compared and the errors are within 10% which verifies the reliability of the model. The simulation results show that this system can handle the process air to 19 ℃ and 9. 7 g/kg under the design condition using 48% mixed solution,and the dehumidification ability of mixed solution is comparable to that of LiCl aqueous solution and the cost of the six mixed solutions is 65. 7% cheaper than that of LiCl aqueous solution at most. Besides,the increase of concentration of mixed solution leads to the increase of temperature and humidity ratio of supply air with better thermal performance and lower transmission and distribution power consumption. Therefore,in order to meet the demand of air supply and energy saving,it is necessary to select the concentration of mixed solution reasonably.
The performance of liquid desiccant cooling system using mixed solution driven by lowgrade heat source was simulated. A mathematical model for the major components of the system was established based on the dimensionless experimental correlations of Sherwood number of the mixed solution to investigate the effect of concentration of mixed solution on performance of this system.The experimental values and calculated values of humidity ratio of air at the outlet of the dehumidifier and regenerator were compared and the errors are within 10% which verifies the reliability of the model. The simulation results show that this system can handle the process air to 19 ℃ and 9. 7 g/kg under the design condition using 48% mixed solution,and the dehumidification ability of mixed solution is comparable to that of LiCl aqueous solution and the cost of the six mixed solutions is 65. 7% cheaper than that of LiCl aqueous solution at most. Besides,the increase of concentration of mixed solution leads to the increase of temperature and humidity ratio of supply air with better thermal performance and lower transmission and distribution power consumption. Therefore,in order to meet the demand of air supply and energy saving,it is necessary to select the concentration of mixed solution reasonably.
引文
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[13]沈子婧.混合盐溶液除湿剂物性测量及除湿性能强化效果探讨[D].南京:东南大学,2016.Shen Z J.Measurement of physical properties and discussion of dehumidification performance of mixed liquid dessicants[D].Nanjing:Southeast University,2016.(in Chinese)
[2]崔文盈.温湿度独立控制溶液除湿空调系统的理论研究及技术方案论证[D].重庆:重庆大学,2007.Cui W Y.Study on the independent humiture control&liquid desiccant air-condition and argumentate on the technique scheme[D].Chongqing:Chongqing University,2007.(in Chinese)
[3]彭冬根.太阳能溶液再生装置热湿耦合特性及性能研究[D].南京:东南大学能源与环境学院,2009.
[4]赵云,施明恒.太阳能液体除湿空调系统中除湿剂的选择[J].工程热物理学报,2001(S1):165-168.Zhao Y,Shi M H.The choice of the desiccant solutions in the liquid desiccant air conditioning system[J].Journal of Engineering Thermophysics,2001(S1):165-168.(in Chinese)
[5]殷勇高.溶液除湿系统除湿/再生过程及其热质耦合机理研究[D].南京:东南大学能源与环境学院,2009.DOI:10.7666/d.y1754656.
[6]Ertas A,Anderson E E,Kiris I.Properties of a new liquid desiccant solution:Lithium chloride and calcium chloride mixture[J].Solar Energy,1992,49(3):205-212.DOI:10.1016/0038-092x(92)90073-j.
[7]张凡,殷勇高.一种低位热驱动除湿冷却空调系统的热性能分析[J].化工学报,2016,67(z2):275-283.DOI:10.11949/j.issn.0438-1157.20161411.Zhang F,Yin Y G.Thermal performance analysis of liquid desiccant evaporative cooling air-conditioning system driven by low-grade heat[J].CIESC Journal,2016,67(z2):275-283.DOI:10.11949/j.issn.0438-1157.20161411.(in Chinese)
[8]Factor H M,Grossman G.A packed bed dehumidifier/regenerator for solar air conditioning with liquid desiccants[J].Solar Energy,1980,24(6):541-550.DOI:10.1016/0038-092x(80)90353-9.
[9]Stevens D I,Braun J E,Klein S A.An effectiveness model of liquid-desiccant system heat/mass exchangers[J].Solar Energy,1989,42(6):449-455.DOI:10.1016/0038-092x(89)90045-5.
[10]Liu X H,Jiang Y.Coupled heat and mass transfer characteristic in packed bed dehumidifier/regenerator using liquid desiccant[J].Energy Conversion and Management,2008,49(6):1357-1366.DOI:10.1016/j.enconman.2008.01.009.
[11]Lazzarin R M,Castellotti F.A new heat pump desiccant dehumidifier for supermarket application[J].Energy and Buildings,2007,39(1):59-65.DOI:10.1016/j.enbuild.2006.05.001.
[12]徐学利,张立志,朱冬生.液体除湿研究与进展[J].暖通空调,2004,34(7):22-26,59.DOI:10.3969/j.issn.1002-8501.2004.07.006.Xu X L,Zhang L Z,Zhu D S.Progress of liquid dehumidification[J].Heating,Ventilating&Air Conditioning,2004,34(7):22-26,59.DOI:10.3969/j.issn.1002-8501.2004.07.006.(in Chinese)
[13]沈子婧.混合盐溶液除湿剂物性测量及除湿性能强化效果探讨[D].南京:东南大学,2016.Shen Z J.Measurement of physical properties and discussion of dehumidification performance of mixed liquid dessicants[D].Nanjing:Southeast University,2016.(in Chinese)
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