ENERGY AND AVAILABILITY ANALYSIS OF PUMP LESS LiBr-H2O SOLAR ABSORPTION COOLING SYSTEMS

Noora Hashim

Abstract


An analytical energy and availability study of pump less LiBr-H2O solar absorption cooling system is submitted with the aid of ESS 9.43 software. This system consists of many components: generator vessel attached by  lift tube and a separator , condenser, evaporator , solution heat exchanger, and absorber. Each components assumed to be operated at constant temperature. The effect of changing of  temperature of each components on cycle performance as well as the availability loss are discussed. The results show that the maximum  availability loss occurs during absorption process in the absorber, and the second worse component is the generator. The optimal generator temperature is obtained and it can be proved that this system can be driven with relatively best performance at low heat sources like solar or any other waste heat sources. By increasing the evaporator and the generator temperature lower than optimum, COP and reversible COP increase while COP values decrease in case of increasing of absorber and condenser temperatures. The total availability loss increases and the second low efficiency decreases in case of increase in all system components.


References


Abdulateef J.M., Sopian K., Alghoul M.A., (2008) “Optimum design for solar absorption refrigeration systems and comparison of the performances using ammonia-water, ammonia-lithium nitrate and ammonia-sodium thiocyanate solutions.” International Journal of Mechanical and Materials Engineering, IJMME, 3

Aman, J., Henshaw, P. Ting, D. S-K., (2016). “Modelling and Analysis of Bubble Pump Parameters for Vapor Absorption Refrigeration Systems” proceedings of ASHRAE Annual Conference, St. Louis, MO, USA, June 25 to 29 ,

Barhoumi M., Ezzine N. B., Bellagi A., (2009). Exergy analysis of an ammonia-water absorption system. International Journal of Exergy, 6 (5).

Bhargav Pandya ,Jatin Patel , Anurag Mudgal. ( 2017 ) “Thermodynamic Evaluation of Generator Temperature in LiBr-Water Absorption System for Optimal Performance” International Conference on Recent Advancement in Air Conditioning and Refrigeration, Energy Procedia 109 ,270 – 278.

Borgnakke and Sontag 2013“ Fundamentals of Thermodynamics” eighth Edition.

Burgett, L. W., Byars, M. D., Shultz, K., 1999, , “Absorption Systems: The Future, More Than A Niche”, Proceedings International Sorption Heat Pump Conference, Munich, Germany, Vol. 1, pp. 13-25.

Dalichaouch M. A. (1989) "Theoretical and Experimental Investigation of an Absorption Refrigeration System for Application with Solar Energy Units". Ph.D thesis.

Deng J., Wang R.Z., Han G.Y., (2011) “A review of thermally activated cooling technologies for combined cooling, heating and power systems.” Progress in Energy and Combustion Science, 37 ,172-203.

Duffie, J.; Beckman,W. (2006) “Solar Engineering of Thermal Processes”; JohnWiley & Sons Inc.: Hoboken, NJ, USA.

Eisa, M.A.R.; Diggory, P.J.; Holland, F.A. . (1987) “Experimental studies to determine the effect of differences in absorber and condenser temperatures on the performance of water lithium bromide absorption cooler.” Energy Convers. Manag, 27, 253–259.

Ezzine N., Barhoumi B., Mejbri M., Chemkhi K., Bellagi S., A., (2004) “Solar cooling with the absorption principle: First and Second Law analysis of an ammonia - water double generator absorption chiller”. Desalination Strategies in South Mediterranean Countries, 168 ,137-144.

Gosney W B. 1982 "Principles of refrigeration", Cambridge University Press, ch 6;.

Herold, K.E., Radermacher, R. and Klein, S.A. (1996). “Absorption Chillers and Heat Pumps.” CRC Press.

Kalkan N., Young, E.A., Celiktas, A., (2012) “Solar thermal air conditioning technology reducing the footprint of solar thermal air conditioning”. Renewable and Sustainable Energy Reviews, 16 ,6352–6383.

Kizilkan, O.; Kabul, A.; Dincer, I. (2016) “Development and performance assessment of a parabolic trough solarcollector-based integrated system for an ice-cream factory”. Energy, 100, 167–176.

Li, J.; Xie, X.; Yi, J. (2015), “Experimental study and correlation on the falling column adiabatic absorption of water vapor into LiBr-H2O solution”. Int. J. Refrig. 51, 112–119.

Mazloumi, M.; Naghashzadegan, M.; Javaherdeh, K.(2008) “Simulation of solar lithium bromide–water absorption cooling system with parabolic trough collector.” Energy Convers. Manag., 49, 2820–2832.

Mittal V., Kasana K. S., Thakur N., S., 2005, “The study of solar absorption air-conditioning systems,” Journal of Energy in Southern Africa, Vol 16 No 4.

Nicklin D.J., (1963) The Air-Lift Pump: Theory and Optimization. Transactions of the Institution of Chemical Engineers, 41,29-39.

Reinemann, D.J., Parlange, J.Y., Timmons, M.B., 1990. Theory of small-diameter airlift pump. Int. J. Multiphase Flow. 16, 113-122.

Shahata A.I., Aboelazm M. M., Elsafty A. F., (2012) Energy and Exergy Analysis for Single and Parallel Flow Double Effect Water-Lithium Bromide Vapor Absorption Systems. International Journal of Science and Technology, 2 ,85-94.

Sujumnong M. (1997)., Heat transfer, pressure drop and void fraction in two phase, two component flow in a vertical tube. PhD thesis. Department of Mechanical and Industrial Engineering, University of Manitoba, Winnipeg, Manitoba, Canada.




DOI: http://dx.doi.org/10.1000/ijses.v0i0.182

Refbacks



Copyright (c) 2019 International Journal Series in Engineering Science (IJSES) (ISSN: 2455-3328)

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.