Back
 EPE  Vol.2 No.4 , November 2010
Thermodynamic and Experimental Analysis of an Ammonia-Water Absorption Chiller
Abstract: A single stage ammonia-water absorption chiller with complete condensation is designed, built and tested. The apparatus is designed for a cooling capacity of 2814 W, which is obtained using electric heater as heating source. The thermodynamic models have been derived using the First and Second Laws. Calculated results are compared with experimental data. The results show that the cooling capacity of experimental apparatus is found between 1900 and 2200 W with the actual coefficient of performance (COP) between 0.32 and 0.36. The contribution of the components to internal entropy production is analyzed. It shows that the larger irreversibility is caused by spanning the largest temperature and dissipated thermal energy by heat transfer losses at the generator and evaporator. In the experimentation, the low pressure is lower than the designed value. This is a consequence of a large capacity in the falling film absorber which performs as expected. This decreases the evaporation pressure, and the evaporating temperature could be reduced to the designed value.
Cite this paper: nullD. Kong, J. Liu, L. Zhang, H. He and Z. Fang, "Thermodynamic and Experimental Analysis of an Ammonia-Water Absorption Chiller," Energy and Power Engineering, Vol. 2 No. 4, 2010, pp. 298-305. doi: 10.4236/epe.2010.24042.
References

[1]   F. Ziegler, “Recent Developments and Future Prospects of Sorption Heat Pump Systems,” International Journal of Thermal Sciences, Paris, Vol. 38, 1999, pp. 191-208.

[2]   A. Apte, “Ammonia Absorption Refrigeration Plants the Ideal Refrigeration System for New Millennium,” Transparent Energy Systems Private Limited, Pune, 2006. http://www. tespl.com

[3]   K. C. Ng, T. Y. Bong, H. T. Chua and H. L. Bao, “Theoretical and Experimental Analysis of an Absorption Chiller,” International Journal of Refrigeration, London, Vol. 17, 1994, pp. 351-358.

[4]   A. Kececiler, H. I. Acar and A. Dogan, “Thermodynamics Analysis of Absorption Refrigeration System with Geothermal Energy: An Experimental Study,” Energy Conversion and Management, London, Vol. 41, 2000, pp. 37-48.

[5]   J. Chen and B. Andresen, “Optimal Analysis of Primary Performance Parameters for an Endoreversible Absorption Heat Pumps,” Heat Recovery Systems and CHP, London, Vol. 15, 1995, pp. 723-731.

[6]   A. Bejan, J. V. C. Vargas and M. Solokov, “Optimal Allocation of a Heat Exchanger Inventory in Heat-Driven Refrigerators,” International Journal of Heat Mass Transfer, Vol. 38, No. 5, 1995, pp. 2997-3004.

[7]   N. E. Wijeysundera, “Analysis of the Ideal Absorption Cycle with External Heat-Transfer Irreversibilities,” Energy, London, Vol. 20, 1995, pp. 123-130.

[8]   C. Wu, “Cooling Capacity Optimization of a Waste Heat Absorption Refrigeration Cycle,” Heat Recovery Systems and CHP, Vol. 13, No. 4, 1993, pp. 161-166.

[9]   C. Wu, “Specific Heating Load of an Endoreversible Carnot Heat Pump,” International Journal of Ambient Energy, Vol. 14, 1993, pp. 25-28.

[10]   K. C. Ng, H. T. Chua and Q. Han, “On the Modeling of Absorption Chillers with External and Internal Irreversibilities,” Applied Thermal Engineering, Vol. 17, No. 5, 1997, pp. 413-425.

[11]   H. T. Chua, J. M. Gordon, K. C. Ng and Q. Han, “Entropy Production Analysis and Experimental Confirmation of Absorption Systems,” International Journal of Refrigeration, Vol. 20, No. 3, 1997, pp. 179-190.

[12]   K. C. Ng, K. Tu and H. T. Chua et al., “Thermodynamic Analysis of Absorption Chillers: Internal Dissipation and Process Average Temperature,” Applied Thermal Engineering, Vol. 18, No. 8, 1998, pp. 671-682.

[13]   H. T. Chua, “Universal Thermodynamic Modeling of Chillers: Special Application to Adsorption Chillers,” Ph.D. Dissertation, National University of Singapore, Singapore, 1998.

[14]   H. T. Chua, H. K. Toh, A. Malek and K. C. Ng, K. Srinivasan, “A General Thermodynamic Framework for Understanding the Behavior of Absorption Chillers,” International Journal of Refrigeration, Vol. 23, No. 7, 2000, pp. 491-507.

[15]   H. T. Chua, H. K. Toh and K. C. Ng, “Thermodynamic Modeling of an Ammonia-Water Absorption Chiller,” International Journal of Refrigeration, Vol. 25, No. 7, 2002, pp. 896-906.

[16]   “Thermo Physical Properties of Refrigerants,” ASHRAE Handbook, 2005.

[17]   R. Tillner-Roth and D. G. Friend, “A Helmholtz Free Energy Formulation of the Thermodynamic Properties of the Mixture {Water + Ammonia},” Journal of Physical and Chemical Reference Data, Vol. 27, No. 1, 1998, pp. 63-96.

[18]   K. C. Ng, H. T. Chua and K. Tu, “The Role of Internal Dissipation and Process Average Temperature in Chiller Performance and Diagnostics,” Journal of Applied Physics, Vol. 83, No. 4, 1998, pp. 1831-1836.

 
 
Top