[1] Wang Li, Lian Zhiwei,. Improvement of conventional liquiddesiccant dehumidification technology [J]. Journal of Southeast University (English Edition), 2010, 26 (2): 212-216. [doi:10.3969/j.issn.1003-7985.2010.02.015]
Copy
Improvement of conventional liquiddesiccant dehumidification technology(
)
传统液体除湿技术的改进
)Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]
- Volumn:
- 26
- Issue:
- 2010 2
- Page:
- 212-216
- Research Field:
- Energy and Power Engineering
- Publishing date:
- 2010-06-30
Info
- Title:
- Improvement of conventional liquiddesiccant dehumidification technology
- 传统液体除湿技术的改进
- Author(s):
- Wang Li; Lian Zhiwei
- School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
- Keywords:
- packed bed; liquid desiccant dehumidification; atomization dehumidification; ultrasound; simulation
- PACS:
- TU831
- DOI:
- 10.3969/j.issn.1003-7985.2010.02.015
- Abstract:
- A new system of liquid desiccant dehumidification, called ultrasound atomization dehumidification system, is proposed.In this system, a packed bed is replaced by ultrasound atomization technology, so high resistance and liquid desiccant consumption caused by the packed bed are avoided.A mathematical model is established to predict the efficiency and the liquid consumption of the dehumidification process under ideal conditions.Through comparing the simulation results with the experimental data of a conventional packed-bed dehumidifier, it is found that the liquid desiccant consumption of the conventional packed-bed dehumidifier is much greater than that under ideal conditions.In the proposed system, the dehumidification process occurs on the surfaces of the micron liquid desiccant droplets produced with the irradiation of ultrasound, so there is a greater contact area created with the same quantity of the liquid desiccant;moreover, the power consumption is lower because there are no nozzles and no solution pump.It can be seen that this new system is closer to ideal conditions when compared with the conventional liquid desiccant dehumidification system.
- 提出一种新型的液体除湿系统——超声雾化液体除湿系统, 该系统用超声雾化技术取代了传统塔式除湿过程中的填料, 避免了由填料带来的溶液耗量大和阻力大的缺点.建立了数学模型来预测在理想条件下液体除湿过程的效率及耗液量.通过对比计算结果和传统塔式除湿的实验数据, 发现后者的溶液耗量远大于理想情况下的耗量.另外, 在提出的系统中除湿过程发生在通过超声作用产生的微小除湿剂液滴表面, 等量的除湿剂能够产生更大的反应表面积;整个新系统中没有喷嘴和溶液泵, 系统阻力和能耗相应降低.因此, 该方法比塔式除湿方式更接近于理想情况.
References:
[1] Öberg V, Goswami D Y.Performance simulation of solar hybrid liquid desiccant cooling for ventilation air preconditioning[C]//Proceedings of the International Solar Energy Engineering Conference.Albuquerque, NM, USA, 1998:176-182.
[2] Patnaik S, Lenz T G, Lof G O G.Performance studies for an experimental solar open-cycle liquid desiccant air dehumidification system[J].Solar Energy, 1990, 44(3):123-135.
[3] Elsarrag E.Performance study on a structured packed liquid desiccant regenerator[J].Solar Energy, 2006, 80(12):1624-1631.
[4] Pietruschka D, Eicker U, Huber M, et al.Experimental performance analysis and modeling of liquid desiccant cooling systems for air conditioning in residential buildings[J].International Journal of Refrigeration, 2006, 29(1):110-124.
[5] Chung T W, Ghosh T K, Hines A L, et al.Dehumidification of moist air with simultaneous removal of selected indoor pollutants by triethylene glycol solutions in a packed-bed absorber[J].Sep Sci Technol, 1995, 30(7/8/9):1809-1832.
[6] Longo G A, Gasparella A.Experimental and theoretical analysis of heat and mass transfer in a packed column dehumidifier/regenerator with liquid desiccant[J].International Journal of Heat and Mass Transfer, 2005, 48(25/26):5240-5254.
[7] Ren C Q, Jiang Y, Zhang Y P.Simplified analysis of coupled heat and mass transfer processes in packed bed liquid desiccant-air contact system[J].Solar Energy, 2006, 80(1):121-131.
[8] Chen X Y, Li Z, Jiang Y, et al.Analytical solution of adiabatic heat and mass transfer process in packed-type liquid desiccant equipment and its application[J].Solar Energy, 2006, 80(11):1509-1516.
[9] Liu X H, Zhang Y, Qu K, et al.Experimental study on mass transfer performances of cross flow dehumidifier using liquid desiccant[J].Energy Conversion and Management, 2006, 47(15/16):2682-2692.
[10] Moona C G, Bansala P K, Sanjeev J.New mass transfer performance data of a cross-flow liquid desiccant dehumidification system[J].International Journal of Refrigeration, 2008, 32(3):1-10.
[11] Ding Zhaoqiu.Study on desiccant air conditioning system[D].Wuhan:Institute of City Construction of Wuhan University of Science and Technology, 2007.(in Chinese)
[12] 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.
[13] Nelson F, Goswami D Y.Study of an aqueous lithium chloride desiccant system:air dehumidification and desiccant regeneration[J].Solar Energy, 2002, 72(4):351-361.
Memo
- Memo:
-
Biographies: Wang Li(1985—), female, graduate;Lian Zhiwei(corresponding author), male, doctor, professor, zwlian@sjtu.edu.cn.
Foundation items: Specialized Research Fund for the Doctoral Program of Higher Education of China(No.20090073110036), the Research Innovation Programs of Shanghai Municipal Education Commission(No.10ZZ14).
Citation: Wang Li, Lian Zhiwei.Improvement of conventional liquid desiccant dehumidification technology[J].Journal of Southeast University(English Edition), 2010, 26(2):212-216.